Jetpack

Complexity

Total Complexity

1120

Size/Duplication

Total Lines	6916
Duplicated Lines	3.18 %

Coupling/Cohesion

Components	5
Dependencies	15

224 Methods

Rating	Name	Duplication	Size	Complexity
B	jetpack_sync_core_icon()	0	16	6
C	jetpack_admin_ajax_callback()	3	27	8
B	jetpack_admin_ajax_refresh_data()	3	14	5
D	jetpack_jumpstart_ajax_callback()	0	90	17
C	jetpack_jitm_ajax_callback()	0	48	10
A	__destruct()	0	5	2
D	jetpack_custom_caps()	0	84	26
A	require_jetpack_authentication()	0	17	2
A	plugin_textdomain()	0	4	1
B	register_assets()	5	24	5
A	devicepx()	0	5	2
A	require_lib_dir()	0	3	1
A	jetpack_main_network_site_option()	0	3	1
A	network_name()	0	4	1
A	network_allow_new_registrations()	0	3	2
A	network_add_new_users()	0	3	1
A	network_site_upload_space()	0	4	2
A	network_upload_file_types()	0	3	1
A	network_max_upload_file_size()	0	4	1
A	network_enable_administration_menus()	0	3	1
A	is_main_network_option()	0	4	1
A	is_multisite()	0	3	1
A	is_multi_network()	0	15	3
B	update_jetpack_main_network_site_option()	0	33	1
A	update_jetpack_network_settings()	0	10	1
A	is_single_user_site()	0	9	1
A	file_system_write_access()	0	20	4
A	init()	0	17	3
F	plugin_upgrade()	13	100	19
A	activate_manage()	0	9	4
D	__construct()	0	238	18
A	is_version_controlled()	0	13	3
A	featured_images_enabled()	0	3	2
A	get_wp_version()	0	4	1
A	update_get_wp_version()	0	10	3
A	sync_update_data()	0	16	4
A	sync_theme_data()	0	4	1
B	get_updates()	6	17	6
A	get_update_details()	0	8	1
B	refresh_update_data()	0	24	4
A	refresh_theme_data()	0	11	1
A	is_single_user_site_invalidate()	0	12	1
A	is_active()	0	3	1
A	is_development_mode()	0	21	4
C	show_development_mode_notice()	0	33	7
A	is_development_version()	0	3	1
A	is_user_connected()	0	7	3
A	get_connected_user_data()	14	14	3
A	get_connected_user_email()	14	14	3
A	get_master_user_email()	0	7	2
A	current_user_is_connection_owner()	0	4	4
A	maybe_set_version_option()	0	8	2
A	load_xml_rpc_client()	0	4	1
D	verify_xml_rpc_signature()	0	98	24
B	authenticate_jetpack()	0	23	6
B	add_nonce()	0	38	3
A	xmlrpc_methods()	0	4	1
A	public_xmlrpc_methods()	0	6	2
B	jetpack_getOptions()	0	40	3
A	xmlrpc_options()	0	18	2
B	clean_nonces()	0	25	5
C	state()	0	50	18
A	restate()	0	3	1
B	check_privacy()	0	35	6
C	xmlrpc_async_call()	0	42	12
B	staticize_subdomain()	0	35	4
A	login_form_json_api_authorization()	0	9	1
B	post_login_form_to_signed_url()	0	13	5
A	preserve_action_in_login_form_for_json_api_authorization()	0	4	1
A	store_json_api_authorization_token()	0	6	1
A	allow_wpcom_public_api_domain()	0	4	1
A	add_token_to_login_redirect_json_api_authorization()	0	12	1
F	verify_json_api_authorization_request()	0	79	20
A	login_message_json_api_authorization()	0	6	1
A	get_content_width()	0	11	2
D	get_avatar_url()	0	28	9
A	get_cloud_site_options()	0	16	2
A	identity_crisis_options_to_check()	0	14	1
C	check_identity_crisis()	0	66	14
B	resolve_identity_crisis()	0	22	4
A	whitelist_current_url()	0	8	2
B	resolve_identity_crisis_ajax_callback()	0	40	4
A	whitelist_identity_crisis_value()	0	14	4
A	is_identity_crisis_value_whitelisted()	0	7	4
A	jetpack_is_staging_site()	0	16	4
A	identity_crisis_js()	0	70	1
D	alert_identity_crisis()	0	125	15
C	maybe_min_asset()	0	35	7
C	maybe_inline_style()	0	50	13
A	load_view()	0	11	2
A	toggle_module_on_wpcom()	0	8	2
B	deprecated_hooks()	0	26	6
D	absolutize_css_urls()	0	44	9
A	is_ssl_required_to_visit_site()	0	11	4
C	implode_frontend_css()	0	52	9
A	concat_remove_style_loader_tag()	0	10	4
C	jetpack_check_heartbeat_data()	0	53	10
A	get_jetpack_options_for_reset()	0	66	3
A	jumpstart_has_updated_module_option()	0	22	3
A	build_raw_urls()	0	6	1
B	dns_prefetch()	0	17	7
C	wp_dashboard_setup()	0	28	7
B	get_user_option_meta_box_order_dashboard()	0	25	5
A	dashboard_widget()	0	8	1
D	dashboard_widget_footer()	8	38	9
B	dashboard_widget_connect_to_wpcom()	0	22	4
C	jetpack_site_icon_available_in_core()	0	35	7
A	extra_oembed_providers()	0	7	1
D	user_role_change()	0	43	10
D	load_modules()	6	79	17
A	check_rest_api_compat()	0	16	3
A	get_active_plugins()	0	16	3
A	get_parsed_plugin_data()	0	20	3
A	get_parsed_theme_data()	0	22	3
A	is_plugin_active()	0	3	1
C	check_open_graph()	0	27	7
B	check_twitter_tags()	0	24	5
A	perform_security_reporting()	0	17	2
C	submit_security_report()	0	64	12
A	get_security_report()	0	4	1
A	get_option_names()	0	3	1
A	get_option()	0	3	1
A	create_nonce()	0	14	4
A	update_option()	0	4	1
A	update_options()	0	4	1
A	delete_option()	0	4	1
A	update_user_token()	0	14	3
C	glob_php()	0	29	7
C	activate_new_modules()	6	58	11
C	get_available_modules()	0	57	13
B	get_default_modules()	0	31	6
C	handle_deprecated_modules()	0	26	8
B	filter_default_modules()	0	24	6
A	get_module_slug()	0	3	1
A	get_module_path()	0	3	1
C	get_module()	0	83	10
B	get_file_data()	0	21	5
A	translate_module_tag()	0	5	1
B	get_active_modules()	0	17	8
A	is_module_active()	0	3	1
A	is_module()	0	3	2
A	catch_errors()	0	13	2
A	catch_errors_on_shutdown()	0	3	1
D	activate_default_modules()	10	121	15
D	activate_module()	8	84	14
A	activate_module_actions()	0	13	1
B	deactivate_module()	8	37	2
A	enable_module_configurable()	0	4	1
A	module_configuration_url()	0	4	1
A	module_configuration_load()	0	4	1
A	module_configuration_head()	0	4	1
A	module_configuration_screen()	0	4	1
A	module_configuration_activation_screen()	0	4	1
B	bail_on_activation()	0	40	5
A	plugin_activation()	0	12	3
A	do_version_bump()	0	7	2
A	plugin_initialize()	6	16	3
A	plugin_deactivation()	0	9	2
B	disconnect()	0	46	4
B	unlink_user()	0	22	5
C	try_registration()	0	25	7
B	log()	0	40	3
C	get_log()	0	36	11
A	log_settings_change()	0	7	2
A	get_stat_data()	0	6	1
A	get_additional_stat_data()	0	10	2
C	admin_init()	0	60	14
A	admin_body_class()	0	8	2
A	add_jetpack_pagestyles()	0	3	1
A	prepare_connect_notice()	0	8	2
A	prepare_manage_jetpack_notice()	0	5	1
A	manage_activate_screen()	0	3	1
C	throw_error_on_activate_plugin()	0	24	7
A	intercept_plugin_error_scrape_init()	0	3	1
A	intercept_plugin_error_scrape()	0	11	4
A	add_remote_request_handlers()	0	3	1
B	remote_request_handlers()	0	34	6
D	upload_handler()	0	85	19
B	admin_help()	0	41	2
A	admin_menu_css()	0	3	1
A	admin_menu_order()	0	3	1
A	jetpack_menu_order()	15	15	4
A	admin_head()	3	5	4
A	admin_banner_styles()	0	7	3
A	admin_scripts()	0	13	1
A	plugin_action_links()	0	15	4
B	admin_connect_notice()	9	34	4
B	admin_jetpack_manage_notice()	0	34	6
A	opt_out_jetpack_manage_url()	0	4	1
A	opt_in_jetpack_manage_url()	0	3	1
A	opt_in_jetpack_manage_notice()	0	10	1
B	can_display_jetpack_manage_notice()	0	22	4
A	network_connect_notice()	0	9	1
B	jetpack_comment_notice()	0	35	6
A	disconnect_survey_notice()	0	19	1
F	admin_page_load()	35	451	129
D	admin_notices()	0	97	13
A	stat()	0	5	2
B	do_stats()	0	15	7
A	do_server_side_stat()	0	10	3
A	build_stats_url()	0	20	1
A	translate_current_user_to_role()	0	9	4
A	translate_role_to_cap()	0	7	2
A	sign_role()	0	12	4
C	build_connect_url()	0	45	8
A	build_reconnect_url()	0	4	2
A	admin_url()	0	5	1
A	nonce_url_no_esc()	0	4	1
C	dismiss_jetpack_notice()	30	74	15
A	debugger_page()	0	8	2
B	admin_screen_configure_module()	0	52	4
B	display_activate_module_link()	0	52	4
A	sort_modules()	0	6	3
A	sync_reindex_trigger()	8	8	3
A	sync_reindex_status()	8	8	3
A	api_url()	0	3	1
B	fix_url_for_bad_hosts()	0	21	6
D	permit_ssl()	0	30	10
A	alert_required_ssl_fail()	0	14	2
A	xmlrpc_api_url()	0	4	1
A	generate_secrets()	0	9	1
A	get_remote_query_timeout_limit()	0	6	2
C	validate_remote_register_response()	0	35	11
D	register()	2	98	14

<?php

/*
Options:
jetpack_options (array)
	An array of options.
	@see Jetpack_Options::get_option_names()

jetpack_register (string)
	Temporary verification secrets.

jetpack_activated (int)
	1: the plugin was activated normally
	2: the plugin was activated on this site because of a network-wide activation
	3: the plugin was auto-installed
	4: the plugin was manually disconnected (but is still installed)

jetpack_active_modules (array)
	Array of active module slugs.

jetpack_do_activate (bool)
	Flag for "activating" the plugin on sites where the activation hook never fired (auto-installs)
*/

class Jetpack {

Since you have declared the constructor as private, maybe you should also declare the class as final.

	public $xmlrpc_server = null;

	private $xmlrpc_verification = null;

	public $HTTP_RAW_POST_DATA = null; // copy of $GLOBALS['HTTP_RAW_POST_DATA']

45% of this comment could be valid code. Did you maybe forget this after debugging?

	/**
	 * @var array The handles of styles that are concatenated into jetpack.css
	 */
	public $concatenated_style_handles = array(
		'jetpack-carousel',
		'grunion.css',
		'the-neverending-homepage',
		'jetpack_likes',
		'jetpack_related-posts',
		'sharedaddy',
		'jetpack-slideshow',
		'presentations',
		'jetpack-subscriptions',
		'tiled-gallery',
		'widget-conditions',
		'jetpack_display_posts_widget',
		'gravatar-profile-widget',
		'widget-grid-and-list',
		'jetpack-widgets',
		'goodreads-widget',
		'jetpack_social_media_icons_widget',
	);

	public $plugins_to_deactivate = array(
		'stats'               => array( 'stats/stats.php', 'WordPress.com Stats' ),
		'shortlinks'          => array( 'stats/stats.php', 'WordPress.com Stats' ),
		'sharedaddy'          => array( 'sharedaddy/sharedaddy.php', 'Sharedaddy' ),
		'twitter-widget'      => array( 'wickett-twitter-widget/wickett-twitter-widget.php', 'Wickett Twitter Widget' ),
		'after-the-deadline'  => array( 'after-the-deadline/after-the-deadline.php', 'After The Deadline' ),
		'contact-form'        => array( 'grunion-contact-form/grunion-contact-form.php', 'Grunion Contact Form' ),
		'contact-form'        => array( 'mullet/mullet-contact-form.php', 'Mullet Contact Form' ),
		'custom-css'          => array( 'safecss/safecss.php', 'WordPress.com Custom CSS' ),
		'random-redirect'     => array( 'random-redirect/random-redirect.php', 'Random Redirect' ),
		'videopress'          => array( 'video/video.php', 'VideoPress' ),
		'widget-visibility'   => array( 'jetpack-widget-visibility/widget-visibility.php', 'Jetpack Widget Visibility' ),
		'widget-visibility'   => array( 'widget-visibility-without-jetpack/widget-visibility-without-jetpack.php', 'Widget Visibility Without Jetpack' ),
		'sharedaddy'          => array( 'jetpack-sharing/sharedaddy.php', 'Jetpack Sharing' ),
		'omnisearch'          => array( 'jetpack-omnisearch/omnisearch.php', 'Jetpack Omnisearch' ),
		'gravatar-hovercards' => array( 'jetpack-gravatar-hovercards/gravatar-hovercards.php', 'Jetpack Gravatar Hovercards' ),
		'latex'               => array( 'wp-latex/wp-latex.php', 'WP LaTeX' )
	);

	public $capability_translations = array(
		'administrator' => 'manage_options',
		'editor'        => 'edit_others_posts',
		'author'        => 'publish_posts',
		'contributor'   => 'edit_posts',
		'subscriber'    => 'read',
	);

	/**
	 * Map of modules that have conflicts with plugins and should not be auto-activated
	 * if the plugins are active.  Used by filter_default_modules
	 *
	 * Plugin Authors: If you'd like to prevent a single module from auto-activating,
	 * change `module-slug` and add this to your plugin:
	 *
	 * add_filter( 'jetpack_get_default_modules', 'my_jetpack_get_default_modules' );
	 * function my_jetpack_get_default_modules( $modules ) {
	 *     return array_diff( $modules, array( 'module-slug' ) );
	 * }
	 *
	 * @var array
	 */
	private $conflicting_plugins = array(
		'comments'          => array(
			'Intense Debate'                    => 'intensedebate/intensedebate.php',
			'Disqus'                            => 'disqus-comment-system/disqus.php',
			'Livefyre'                          => 'livefyre-comments/livefyre.php',
			'Comments Evolved for WordPress'    => 'gplus-comments/comments-evolved.php',
			'Google+ Comments'                  => 'google-plus-comments/google-plus-comments.php',
			'WP-SpamShield Anti-Spam'           => 'wp-spamshield/wp-spamshield.php',
		),
		'contact-form'      => array(
			'Contact Form 7'                    => 'contact-form-7/wp-contact-form-7.php',
			'Gravity Forms'                     => 'gravityforms/gravityforms.php',
			'Contact Form Plugin'               => 'contact-form-plugin/contact_form.php',
			'Easy Contact Forms'                => 'easy-contact-forms/easy-contact-forms.php',
			'Fast Secure Contact Form'          => 'si-contact-form/si-contact-form.php',
		),
		'minileven'         => array(
			'WPtouch'                           => 'wptouch/wptouch.php',
		),
		'latex'             => array(
			'LaTeX for WordPress'               => 'latex/latex.php',
			'Youngwhans Simple Latex'           => 'youngwhans-simple-latex/yw-latex.php',
			'Easy WP LaTeX'                     => 'easy-wp-latex-lite/easy-wp-latex-lite.php',
			'MathJax-LaTeX'                     => 'mathjax-latex/mathjax-latex.php',
			'Enable Latex'                      => 'enable-latex/enable-latex.php',
			'WP QuickLaTeX'                     => 'wp-quicklatex/wp-quicklatex.php',
		),
		'protect'           => array(
			'Limit Login Attempts'              => 'limit-login-attempts/limit-login-attempts.php',
			'Captcha'                           => 'captcha/captcha.php',
			'Brute Force Login Protection'      => 'brute-force-login-protection/brute-force-login-protection.php',
			'Login Security Solution'           => 'login-security-solution/login-security-solution.php',
			'WPSecureOps Brute Force Protect'   => 'wpsecureops-bruteforce-protect/wpsecureops-bruteforce-protect.php',
			'BulletProof Security'              => 'bulletproof-security/bulletproof-security.php',
			'SiteGuard WP Plugin'               => 'siteguard/siteguard.php',
			'Security-protection'               => 'security-protection/security-protection.php',
			'Login Security'                    => 'login-security/login-security.php',
			'Botnet Attack Blocker'             => 'botnet-attack-blocker/botnet-attack-blocker.php',
			'Wordfence Security'                => 'wordfence/wordfence.php',
			'All In One WP Security & Firewall' => 'all-in-one-wp-security-and-firewall/wp-security.php',
			'iThemes Security'                  => 'better-wp-security/better-wp-security.php',
		),
		'random-redirect'   => array(
			'Random Redirect 2'                 => 'random-redirect-2/random-redirect.php',
		),
		'related-posts'     => array(
			'YARPP'                             => 'yet-another-related-posts-plugin/yarpp.php',
			'WordPress Related Posts'           => 'wordpress-23-related-posts-plugin/wp_related_posts.php',
			'nrelate Related Content'           => 'nrelate-related-content/nrelate-related.php',
			'Contextual Related Posts'          => 'contextual-related-posts/contextual-related-posts.php',
			'Related Posts for WordPress'       => 'microkids-related-posts/microkids-related-posts.php',
			'outbrain'                          => 'outbrain/outbrain.php',
			'Shareaholic'                       => 'shareaholic/shareaholic.php',
			'Sexybookmarks'                     => 'sexybookmarks/shareaholic.php',
		),
		'sharedaddy'        => array(
			'AddThis'                           => 'addthis/addthis_social_widget.php',
			'Add To Any'                        => 'add-to-any/add-to-any.php',
			'ShareThis'                         => 'share-this/sharethis.php',
			'Shareaholic'                       => 'shareaholic/shareaholic.php',
		),
		'verification-tools' => array(
			'WordPress SEO by Yoast'            => 'wordpress-seo/wp-seo.php',
			'WordPress SEO Premium by Yoast'    => 'wordpress-seo-premium/wp-seo-premium.php',
			'All in One SEO Pack'               => 'all-in-one-seo-pack/all_in_one_seo_pack.php',
		),
		'widget-visibility' => array(
			'Widget Logic'                      => 'widget-logic/widget_logic.php',
			'Dynamic Widgets'                   => 'dynamic-widgets/dynamic-widgets.php',
		),
	);

	/**
	 * Plugins for which we turn off our Facebook OG Tags implementation.
	 *
	 * Note: WordPress SEO by Yoast and WordPress SEO Premium by Yoast automatically deactivate
	 * Jetpack's Open Graph tags via filter when their Social Meta modules are active.
	 *
	 * Plugin authors: If you'd like to prevent Jetpack's Open Graph tag generation in your plugin, you can do so via this filter:
	 * add_filter( 'jetpack_enable_open_graph', '__return_false' );
	 */
	private $open_graph_conflicting_plugins = array(
		'2-click-socialmedia-buttons/2-click-socialmedia-buttons.php',
		                                                         // 2 Click Social Media Buttons
		'add-link-to-facebook/add-link-to-facebook.php',         // Add Link to Facebook
		'add-meta-tags/add-meta-tags.php',                       // Add Meta Tags
		'easy-facebook-share-thumbnails/esft.php',               // Easy Facebook Share Thumbnail
		'facebook/facebook.php',                                 // Facebook (official plugin)
		'facebook-awd/AWD_facebook.php',                         // Facebook AWD All in one
		'facebook-featured-image-and-open-graph-meta-tags/fb-featured-image.php',
		                                                         // Facebook Featured Image & OG Meta Tags
		'facebook-meta-tags/facebook-metatags.php',              // Facebook Meta Tags
		'wonderm00ns-simple-facebook-open-graph-tags/wonderm00n-open-graph.php',
		                                                         // Facebook Open Graph Meta Tags for WordPress
		'facebook-revised-open-graph-meta-tag/index.php',        // Facebook Revised Open Graph Meta Tag
		'facebook-thumb-fixer/_facebook-thumb-fixer.php',        // Facebook Thumb Fixer
		'facebook-and-digg-thumbnail-generator/facebook-and-digg-thumbnail-generator.php',
		                                                         // Fedmich's Facebook Open Graph Meta
		'header-footer/plugin.php',                              // Header and Footer
		'network-publisher/networkpub.php',                      // Network Publisher
		'nextgen-facebook/nextgen-facebook.php',                 // NextGEN Facebook OG
		'social-networks-auto-poster-facebook-twitter-g/NextScripts_SNAP.php',
		                                                         // NextScripts SNAP
		'opengraph/opengraph.php',                               // Open Graph
		'open-graph-protocol-framework/open-graph-protocol-framework.php',
		                                                         // Open Graph Protocol Framework
		'seo-facebook-comments/seofacebook.php',                 // SEO Facebook Comments
		'seo-ultimate/seo-ultimate.php',                         // SEO Ultimate
		'sexybookmarks/sexy-bookmarks.php',                      // Shareaholic
		'shareaholic/sexy-bookmarks.php',                        // Shareaholic
		'sharepress/sharepress.php',                             // SharePress
		'simple-facebook-connect/sfc.php',                       // Simple Facebook Connect
		'social-discussions/social-discussions.php',             // Social Discussions
		'social-sharing-toolkit/social_sharing_toolkit.php',     // Social Sharing Toolkit
		'socialize/socialize.php',                               // Socialize
		'only-tweet-like-share-and-google-1/tweet-like-plusone.php',
		                                                         // Tweet, Like, Google +1 and Share
		'wordbooker/wordbooker.php',                             // Wordbooker
		'wpsso/wpsso.php',                                       // WordPress Social Sharing Optimization
		'wp-caregiver/wp-caregiver.php',                         // WP Caregiver
		'wp-facebook-like-send-open-graph-meta/wp-facebook-like-send-open-graph-meta.php',
		                                                         // WP Facebook Like Send & Open Graph Meta
		'wp-facebook-open-graph-protocol/wp-facebook-ogp.php',   // WP Facebook Open Graph protocol
		'wp-ogp/wp-ogp.php',                                     // WP-OGP
		'zoltonorg-social-plugin/zosp.php',                      // Zolton.org Social Plugin
		'wp-fb-share-like-button/wp_fb_share-like_widget.php'    // WP Facebook Like Button
	);

	/**
	 * Plugins for which we turn off our Twitter Cards Tags implementation.
	 */
	private $twitter_cards_conflicting_plugins = array(
	//	'twitter/twitter.php',                       // The official one handles this on its own.
	//	                                             // https://github.com/twitter/wordpress/blob/master/src/Twitter/WordPress/Cards/Compatibility.php
		'eewee-twitter-card/index.php',              // Eewee Twitter Card
		'ig-twitter-cards/ig-twitter-cards.php',     // IG:Twitter Cards
		'jm-twitter-cards/jm-twitter-cards.php',     // JM Twitter Cards
		'kevinjohn-gallagher-pure-web-brilliants-social-graph-twitter-cards-extention/kevinjohn_gallagher___social_graph_twitter_output.php',
		                                             // Pure Web Brilliant's Social Graph Twitter Cards Extension
		'twitter-cards/twitter-cards.php',           // Twitter Cards
		'twitter-cards-meta/twitter-cards-meta.php', // Twitter Cards Meta
		'wp-twitter-cards/twitter_cards.php',        // WP Twitter Cards
	);

	/**
	 * Message to display in admin_notice
	 * @var string
	 */
	public $message = '';

	/**
	 * Error to display in admin_notice
	 * @var string
	 */
	public $error = '';

	/**
	 * Modules that need more privacy description.
	 * @var string
	 */
	public $privacy_checks = '';

	/**
	 * Stats to record once the page loads
	 *
	 * @var array
	 */
	public $stats = array();

	/**
	 * Allows us to build a temporary security report
	 *
	 * @var array
	 */
	static $security_report = array();

The visibility should be declared for property $security_report.

	/**
	 * Jetpack_Sync object
	 */
	public $sync;

	/**
	 * Verified data for JSON authorization request
	 */
	public $json_api_authorization_request = array();

	/**
	 * Holds the singleton instance of this class
	 * @since 2.3.3
	 * @var Jetpack
	 */
	static $instance = false;

The visibility should be declared for property $instance.

	/**
	 * Singleton
	 * @static
	 */
	public static function init() {
		if ( ! self::$instance ) {
			if ( did_action( 'plugins_loaded' ) )
				self::plugin_textdomain();
			else
				add_action( 'plugins_loaded', array( __CLASS__, 'plugin_textdomain' ), 99 );

			self::$instance = new Jetpack;

			self::$instance->plugin_upgrade();

			add_action( 'init', array( __CLASS__, 'perform_security_reporting' ) );

		}

		return self::$instance;
	}

	/**
	 * Must never be called statically
	 */
	function plugin_upgrade() {
		// Upgrade: 1.1 -> 1.2

50% of this comment could be valid code. Did you maybe forget this after debugging?

		if ( get_option( 'jetpack_id' ) ) {
			// Move individual jetpack options to single array of options
			$options = array();
			foreach ( Jetpack_Options::get_option_names() as $option ) {
				if ( false !== $value = get_option( "jetpack_$option" ) ) {
					$options[$option] = $value;
				}
			}

			if ( $options ) {

The expression $options of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

				Jetpack_Options::update_options( $options );

				foreach ( array_keys( $options ) as $option ) {
					delete_option( "jetpack_$option" );
				}
			}

			// Add missing version and old_version options
			if ( ! $version = Jetpack_Options::get_option( 'version' ) ) {
				$version = $old_version = '1.1:' . time();
				/**
				 * Fires on update, before bumping version numbers up to a new version.
				 *
				 * @since 3.4.0
				 *
				 * @param string $version Jetpack version number.
				 * @param bool false Does an old version exist. Default is false.
				 */
				do_action( 'updating_jetpack_version', $version, false );
				Jetpack_Options::update_options( compact( 'version', 'old_version' ) );
			}
		}

		// Upgrade from a single user token to a user_id-indexed array and a master_user ID
		if ( ! Jetpack_Options::get_option( 'user_tokens' ) ) {
			if ( $user_token = Jetpack_Options::get_option( 'user_token' ) ) {
				$token_parts = explode( '.', $user_token );
				if ( isset( $token_parts[2] ) ) {
					$master_user = $token_parts[2];
					$user_tokens = array( $master_user => $user_token );
					Jetpack_Options::update_options( compact( 'master_user', 'user_tokens' ) );
					Jetpack_Options::delete_option( 'user_token' );
				} else {
					// @todo: is this even possible?

Comments for TODO tasks are often forgotten in the code; it might be better to use a dedicated issue tracker.

					trigger_error( sprintf( 'Jetpack::plugin_upgrade found no user_id in user_token "%s"', $user_token ), E_USER_WARNING );
				}
			}
		}

		// Clean up legacy G+ Authorship data.
		if ( get_option( 'gplus_authors' ) ) {
			delete_option( 'gplus_authors' );
			delete_option( 'hide_gplus' );
			delete_metadata( 'post', 0, 'gplus_authorship_disabled', null, true );
		}

		if ( ! get_option( 'jetpack_private_options' ) ) {
			$jetpack_options = get_option( 'jetpack_options', array() );
			foreach( Jetpack_Options::get_option_names( 'private' ) as $option_name ) {
				if ( isset( $jetpack_options[ $option_name ] ) ) {
					Jetpack_Options::update_option( $option_name, $jetpack_options[ $option_name ] );
					unset( $jetpack_options[ $option_name ] );
				}
			}
			update_option( 'jetpack_options', $jetpack_options );
		}

		if ( Jetpack::is_active() ) {
			list( $version ) = explode( ':', Jetpack_Options::get_option( 'version' ) );
			if ( JETPACK__VERSION != $version ) {
				add_action( 'init', array( __CLASS__, 'activate_new_modules' ) );
				/**
				 * Fires when synchronizing all registered options and constants.
				 *
				 * @since 3.3.0
				 */
				do_action( 'jetpack_sync_all_registered_options' );
			}

			//if Jetpack is connected check if jetpack_unique_connection exists and if not then set it
			$jetpack_unique_connection = get_option( 'jetpack_unique_connection' );
			$is_unique_connection = $jetpack_unique_connection && array_key_exists( 'version', $jetpack_unique_connection );
			if ( ! $is_unique_connection ) {
				$jetpack_unique_connection = array(
					'connected'     => 1,
					'disconnected'  => -1,
					'version'       => '3.6.1'
				);
				update_option( 'jetpack_unique_connection', $jetpack_unique_connection );
			}
		}

		if ( get_option( 'jetpack_json_api_full_management' ) ) {
			delete_option( 'jetpack_json_api_full_management' );
			self::activate_manage();
		}

	}

	static function activate_manage( ) {

		if ( did_action( 'init' ) || current_filter() == 'init' ) {
			self::activate_module( 'manage', false, false );
		} else if ( !  has_action( 'init' , array( __CLASS__, 'activate_manage' ) ) ) {
			add_action( 'init', array( __CLASS__, 'activate_manage' ) );
		}

	}

	/**
	 * Constructor.  Initializes WordPress hooks
	 */
	private function __construct() {
		/*
		 * Check for and alert any deprecated hooks
		 */
		add_action( 'init', array( $this, 'deprecated_hooks' ) );

		/*
		 * Do things that should run even in the network admin
		 * here, before we potentially fail out.
		 */
		add_filter( 'jetpack_require_lib_dir', array( $this, 'require_lib_dir' ) );

		/**
		 * We need sync object even in Multisite mode
		 */
		$this->sync = new Jetpack_Sync;

		/**
		 * Trigger a wp_version sync when updating WP versions
		 **/
		add_action( 'upgrader_process_complete', array( 'Jetpack', 'update_get_wp_version' ), 10, 2 );
		$this->sync->mock_option( 'wp_version', array( 'Jetpack', 'get_wp_version' ) );

		add_action( 'init', array( $this, 'sync_update_data') );
		add_action( 'init', array( $this, 'sync_theme_data' ) );

		/*
		 * Load things that should only be in Network Admin.
		 *
		 * For now blow away everything else until a more full
		 * understanding of what is needed at the network level is
		 * available
		 */
		if( is_multisite() ) {
			Jetpack_Network::init();

			// Only sync this info if we are on a multi site
			// @since  3.7
			$this->sync->mock_option( 'network_name', array( 'Jetpack', 'network_name' ) );
			$this->sync->mock_option( 'network_allow_new_registrations', array( 'Jetpack', 'network_allow_new_registrations' ) );
			$this->sync->mock_option( 'network_add_new_users', array( 'Jetpack', 'network_add_new_users' ) );
			$this->sync->mock_option( 'network_site_upload_space', array( 'Jetpack', 'network_site_upload_space' ) );
			$this->sync->mock_option( 'network_upload_file_types', array( 'Jetpack', 'network_upload_file_types' ) );
			$this->sync->mock_option( 'network_enable_administration_menus', array( 'Jetpack', 'network_enable_administration_menus' ) );

			if( is_network_admin() ) {
				// Sync network site data if it is updated or not.
				add_action( 'update_wpmu_options', array( $this, 'update_jetpack_network_settings' ) );
				return; // End here to prevent single site actions from firing
			}
		}


		$theme_slug = get_option( 'stylesheet' );


		// Modules should do Jetpack_Sync::sync_options( __FILE__, $option, ... ); instead

42% of this comment could be valid code. Did you maybe forget this after debugging?

		// We access the "internal" method here only because the Jetpack object isn't instantiated yet
		$this->sync->options(
			JETPACK__PLUGIN_DIR . 'jetpack.php',
			'home',
			'siteurl',
			'blogname',
			'gmt_offset',
			'timezone_string',
			'security_report',
			'stylesheet',
			"theme_mods_{$theme_slug}",
			'jetpack_sync_non_public_post_stati',
			'jetpack_options',
			'site_icon', // (int) - ID of core's Site Icon attachment ID
			'default_post_format',
			'default_category',
			'large_size_w',
			'large_size_h',
			'thumbnail_size_w',
			'thumbnail_size_h',
			'medium_size_w',
			'medium_size_h',
			'thumbnail_crop',
			'image_default_link_type'
		);

		foreach( Jetpack_Options::get_option_names( 'non-compact' ) as $option ) {
			$this->sync->options( __FILE__, 'jetpack_' . $option );
		}

		/**
		 * Sometimes you want to sync data to .com without adding options to .org sites.
		 * The mock option allows you to do just that.
		 */
		$this->sync->mock_option( 'is_main_network',   array( $this, 'is_main_network_option' ) );
		$this->sync->mock_option( 'is_multi_site', array( $this, 'is_multisite' ) );
		$this->sync->mock_option( 'main_network_site', array( $this, 'jetpack_main_network_site_option' ) );
		$this->sync->mock_option( 'single_user_site', array( 'Jetpack', 'is_single_user_site' ) );
		$this->sync->mock_option( 'stat_data', array( $this, 'get_stat_data' ) );

		$this->sync->mock_option( 'has_file_system_write_access', array( 'Jetpack', 'file_system_write_access' ) );
		$this->sync->mock_option( 'is_version_controlled', array( 'Jetpack', 'is_version_controlled' ) );
		$this->sync->mock_option( 'max_upload_size', 'wp_max_upload_size' );
		$this->sync->mock_option( 'content_width', array( 'Jetpack', 'get_content_width' ) );

		/**
		 * Trigger an update to the main_network_site when we update the blogname of a site.
		 *
		 */
		add_action( 'update_option_siteurl', array( $this, 'update_jetpack_main_network_site_option' ) );

		add_action( 'update_option', array( $this, 'log_settings_change' ), 10, 3 );

		// Update the settings everytime the we register a new user to the site or we delete a user.
		add_action( 'user_register', array( $this, 'is_single_user_site_invalidate' ) );
		add_action( 'deleted_user', array( $this, 'is_single_user_site_invalidate' ) );

		// Unlink user before deleting the user from .com
		add_action( 'deleted_user', array( $this, 'unlink_user' ), 10, 1 );
		add_action( 'remove_user_from_blog', array( $this, 'unlink_user' ), 10, 1 );

		if ( defined( 'XMLRPC_REQUEST' ) && XMLRPC_REQUEST && isset( $_GET['for'] ) && 'jetpack' == $_GET['for'] ) {
			@ini_set( 'display_errors', false ); // Display errors can cause the XML to be not well formed.

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

			require_once JETPACK__PLUGIN_DIR . 'class.jetpack-xmlrpc-server.php';
			$this->xmlrpc_server = new Jetpack_XMLRPC_Server();

			$this->require_jetpack_authentication();

			if ( Jetpack::is_active() ) {
				// Hack to preserve $HTTP_RAW_POST_DATA
				add_filter( 'xmlrpc_methods', array( $this, 'xmlrpc_methods' ) );

				$signed = $this->verify_xml_rpc_signature();
				if ( $signed && ! is_wp_error( $signed ) ) {
					// The actual API methods.
					add_filter( 'xmlrpc_methods', array( $this->xmlrpc_server, 'xmlrpc_methods' ) );
				} else {
					add_filter( 'xmlrpc_methods', '__return_empty_array' );
				}
			} else {
				// The bootstrap API methods.
				add_filter( 'xmlrpc_methods', array( $this->xmlrpc_server, 'bootstrap_xmlrpc_methods' ) );
			}

			// Now that no one can authenticate, and we're whitelisting all XML-RPC methods, force enable_xmlrpc on.
			add_filter( 'pre_option_enable_xmlrpc', '__return_true' );
		} elseif ( is_admin() && isset( $_POST['action'] ) && 'jetpack_upload_file' == $_POST['action'] ) {
			$this->require_jetpack_authentication();
			$this->add_remote_request_handlers();
		} else {
			if ( Jetpack::is_active() ) {
				add_action( 'login_form_jetpack_json_api_authorization', array( &$this, 'login_form_json_api_authorization' ) );
				add_filter( 'xmlrpc_methods', array( $this, 'public_xmlrpc_methods' ) );
			}
		}

		if ( Jetpack::is_active() ) {
			Jetpack_Heartbeat::init();
		}

		add_action( 'jetpack_clean_nonces', array( 'Jetpack', 'clean_nonces' ) );
		if ( ! wp_next_scheduled( 'jetpack_clean_nonces' ) ) {
			wp_schedule_event( time(), 'hourly', 'jetpack_clean_nonces' );
		}

		add_filter( 'xmlrpc_blog_options', array( $this, 'xmlrpc_options' ) );

		add_action( 'admin_init', array( $this, 'admin_init' ) );
		add_action( 'admin_init', array( $this, 'dismiss_jetpack_notice' ) );

		add_filter( 'admin_body_class', array( $this, 'admin_body_class' ) );

		add_action( 'wp_dashboard_setup', array( $this, 'wp_dashboard_setup' ) );
		// Filter the dashboard meta box order to swap the new one in in place of the old one.
		add_filter( 'get_user_option_meta-box-order_dashboard', array( $this, 'get_user_option_meta_box_order_dashboard' ) );

		add_action( 'wp_ajax_jetpack-sync-reindex-trigger', array( $this, 'sync_reindex_trigger' ) );
		add_action( 'wp_ajax_jetpack-sync-reindex-status', array( $this, 'sync_reindex_status' ) );

		// Jump Start AJAX callback function
		add_action( 'wp_ajax_jetpack_jumpstart_ajax',  array( $this, 'jetpack_jumpstart_ajax_callback' ) );
		add_action( 'update_option', array( $this, 'jumpstart_has_updated_module_option' ) );

		// Identity Crisis AJAX callback function
		add_action( 'wp_ajax_jetpack_resolve_identity_crisis', array( $this, 'resolve_identity_crisis_ajax_callback' ) );

		// JITM AJAX callback function
		add_action( 'wp_ajax_jitm_ajax',  array( $this, 'jetpack_jitm_ajax_callback' ) );

		add_action( 'wp_ajax_jetpack_admin_ajax',          array( $this, 'jetpack_admin_ajax_callback' ) );
		add_action( 'wp_ajax_jetpack_admin_ajax_refresh',  array( $this, 'jetpack_admin_ajax_refresh_data' ) );

		add_action( 'wp_loaded', array( $this, 'register_assets' ) );
		add_action( 'wp_enqueue_scripts', array( $this, 'devicepx' ) );
		add_action( 'customize_controls_enqueue_scripts', array( $this, 'devicepx' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'devicepx' ) );

		add_action( 'jetpack_activate_module', array( $this, 'activate_module_actions' ) );

		add_action( 'plugins_loaded', array( $this, 'extra_oembed_providers' ), 100 );

		add_action( 'jetpack_notices', array( $this, 'show_development_mode_notice' ) );

		/**
		 * These actions run checks to load additional files.
		 * They check for external files or plugins, so they need to run as late as possible.
		 */
		add_action( 'wp_head', array( $this, 'check_open_graph' ),       1 );
		add_action( 'plugins_loaded', array( $this, 'check_twitter_tags' ),     999 );
		add_action( 'plugins_loaded', array( $this, 'check_rest_api_compat' ), 1000 );

		add_filter( 'plugins_url',      array( 'Jetpack', 'maybe_min_asset' ),     1, 3 );
		add_filter( 'style_loader_tag', array( 'Jetpack', 'maybe_inline_style' ), 10, 2 );

		add_filter( 'map_meta_cap', array( $this, 'jetpack_custom_caps' ), 1, 4 );

		add_filter( 'jetpack_get_default_modules', array( $this, 'filter_default_modules' ) );
		add_filter( 'jetpack_get_default_modules', array( $this, 'handle_deprecated_modules' ), 99 );

		// A filter to control all just in time messages
		add_filter( 'jetpack_just_in_time_msgs', '__return_true' );

		/**
		 * This is the hack to concatinate all css files into one.
		 * For description and reasoning see the implode_frontend_css method
		 *
		 * Super late priority so we catch all the registered styles
		 */
		if( !is_admin() ) {
			add_action( 'wp_print_styles', array( $this, 'implode_frontend_css' ), -1 ); // Run first
			add_action( 'wp_print_footer_scripts', array( $this, 'implode_frontend_css' ), -1 ); // Run first to trigger before `print_late_styles`
		}

		// Sync Core Icon: Detect changes in Core's Site Icon and make it syncable.
		add_action( 'add_option_site_icon',    array( $this, 'jetpack_sync_core_icon' ) );
		add_action( 'update_option_site_icon', array( $this, 'jetpack_sync_core_icon' ) );
		add_action( 'delete_option_site_icon', array( $this, 'jetpack_sync_core_icon' ) );
		add_action( 'jetpack_heartbeat',       array( $this, 'jetpack_sync_core_icon' ) );

	}

	/*
	 * Make sure any site icon added to core can get
	 * synced back to dotcom, so we can display it there.
	 */
	function jetpack_sync_core_icon() {
		if ( function_exists( 'get_site_icon_url' ) ) {
			$url = get_site_icon_url();
		} else {
			return;
		}

		require_once( JETPACK__PLUGIN_DIR . 'modules/site-icon/site-icon-functions.php' );
		// If there's a core icon, maybe update the option.  If not, fall back to Jetpack's.
		if ( ! empty( $url ) && $url !== jetpack_site_icon_url() ) {
			// This is the option that is synced with dotcom
			Jetpack_Options::update_option( 'site_icon_url', $url );
		} else if ( empty( $url ) && did_action( 'delete_option_site_icon' ) ) {
			Jetpack_Options::delete_option( 'site_icon_url' );
		}
	}

	function jetpack_admin_ajax_callback() {
		// Check for nonce
		if ( ! isset( $_REQUEST['adminNonce'] ) || ! wp_verify_nonce( $_REQUEST['adminNonce'], 'jetpack-admin-nonce' ) || ! current_user_can( 'jetpack_manage_modules' ) ) {
			wp_die( 'permissions check failed' );
		}

		if ( isset( $_REQUEST['toggleModule'] ) && 'nux-toggle-module' == $_REQUEST['toggleModule'] ) {
			$slug = $_REQUEST['thisModuleSlug'];

			if ( ! in_array( $slug, Jetpack::get_available_modules() ) ) {
				wp_die( 'That is not a Jetpack module slug' );
			}

			if ( Jetpack::is_module_active( $slug ) ) {
				Jetpack::deactivate_module( $slug );
			} else {
				Jetpack::activate_module( $slug, false, false );
			}

			$modules = Jetpack_Admin::init()->get_modules();
			echo json_encode( $modules[ $slug ] );

			exit;

The method jetpack_admin_ajax_callback() contains an exit expression.

		}

		wp_die();
	}

	/*
	 * Sometimes we need to refresh the data,
	 * especially if the page is visited via a 'history'
	 * event like back/forward
	 */
	function jetpack_admin_ajax_refresh_data() {
		// Check for nonce
		if ( ! isset( $_REQUEST['adminNonce'] ) || ! wp_verify_nonce( $_REQUEST['adminNonce'], 'jetpack-admin-nonce' ) ) {
			wp_die( 'permissions check failed' );
		}

		if ( isset( $_REQUEST['refreshData'] ) && 'refresh' == $_REQUEST['refreshData'] ) {
			$modules = Jetpack_Admin::init()->get_modules();
			echo json_encode( $modules );
			exit;

The method jetpack_admin_ajax_refresh_data() contains an exit expression.

		}

		wp_die();
	}

	/**
	 * The callback for the Jump Start ajax requests.
	 */
	function jetpack_jumpstart_ajax_callback() {
		// Check for nonce
		if ( ! isset( $_REQUEST['jumpstartNonce'] ) || ! wp_verify_nonce( $_REQUEST['jumpstartNonce'], 'jetpack-jumpstart-nonce' ) )
			wp_die( 'permissions check failed' );

		if ( isset( $_REQUEST['jumpStartActivate'] ) && 'jump-start-activate' == $_REQUEST['jumpStartActivate'] ) {
			// Update the jumpstart option
			if ( 'new_connection' === Jetpack_Options::get_option( 'jumpstart' ) ) {
				Jetpack_Options::update_option( 'jumpstart', 'jumpstart_activated' );
			}

			// Loops through the requested "Jump Start" modules, and activates them.
			// Custom 'no_message' state, so that no message will be shown on reload.
			$modules = $_REQUEST['jumpstartModSlug'];
			$module_slugs = array();
			foreach( $modules as $module => $value ) {
				$module_slugs[] = $value['module_slug'];
			}

			// Check for possible conflicting plugins
			$module_slugs_filtered = $this->filter_default_modules( $module_slugs );

			foreach ( $module_slugs_filtered as $module_slug ) {
				Jetpack::log( 'activate', $module_slug );
				Jetpack::activate_module( $module_slug, false, false );
				Jetpack::state( 'message', 'no_message' );
			}

			// Set the default sharing buttons and set to display on posts if none have been set.
			$sharing_services = get_option( 'sharing-services' );
			$sharing_options  = get_option( 'sharing-options' );
			if ( empty( $sharing_services['visible'] ) ) {
				// Default buttons to set
				$visible = array(
					'twitter',
					'facebook',
					'google-plus-1',
				);
				$hidden = array();

				// Set some sharing settings
				$sharing = new Sharing_Service();
				$sharing_options['global'] = array(
					'button_style'  => 'icon',
					'sharing_label' => $sharing->default_sharing_label,
					'open_links'    => 'same',
					'show'          => array( 'post' ),
					'custom'        => isset( $sharing_options['global']['custom'] ) ? $sharing_options['global']['custom'] : array()
				);

				update_option( 'sharing-options', $sharing_options );

				// Send a success response so that we can display an error message.
				$success = update_option( 'sharing-services', array( 'visible' => $visible, 'hidden' => $hidden ) );
				echo json_encode( $success );
				exit;

The method jetpack_jumpstart_ajax_callback() contains an exit expression.

			}

		} elseif ( isset( $_REQUEST['disableJumpStart'] ) && true == $_REQUEST['disableJumpStart'] ) {
			// If dismissed, flag the jumpstart option as such.
			// Send a success response so that we can display an error message.
			if ( 'new_connection' === Jetpack_Options::get_option( 'jumpstart' ) ) {
				$success = Jetpack_Options::update_option( 'jumpstart', 'jumpstart_dismissed' );
				echo json_encode( $success );
				exit;

The method jetpack_jumpstart_ajax_callback() contains an exit expression.

			}

		} elseif ( isset( $_REQUEST['jumpStartDeactivate'] ) && 'jump-start-deactivate' == $_REQUEST['jumpStartDeactivate'] ) {

			// FOR TESTING ONLY
			// @todo remove

Comments for TODO tasks are often forgotten in the code; it might be better to use a dedicated issue tracker.

			$modules = (array) $_REQUEST['jumpstartModSlug'];
			foreach( $modules as $module => $value ) {
				if ( !in_array( $value['module_slug'], Jetpack::get_default_modules() ) ) {
					Jetpack::log( 'deactivate', $value['module_slug'] );
					Jetpack::deactivate_module( $value['module_slug'] );
					Jetpack::state( 'message', 'no_message' );
				} else {
					Jetpack::log( 'activate', $value['module_slug'] );
					Jetpack::activate_module( $value['module_slug'], false, false );
					Jetpack::state( 'message', 'no_message' );
				}
			}

			Jetpack_Options::update_option( 'jumpstart', 'new_connection' );
			echo "reload the page";
		}

		wp_die();
	}

	/**
	 * The callback for the JITM ajax requests.
	 */
	function jetpack_jitm_ajax_callback() {
		// Check for nonce
		if ( ! isset( $_REQUEST['jitmNonce'] ) || ! wp_verify_nonce( $_REQUEST['jitmNonce'], 'jetpack-jitm-nonce' ) ) {
			wp_die( 'Module activation failed due to lack of appropriate permissions' );
		}
		if ( isset( $_REQUEST['jitmActionToTake'] ) && 'activate' == $_REQUEST['jitmActionToTake'] ) {
			$module_slug = $_REQUEST['jitmModule'];
			Jetpack::log( 'activate', $module_slug );
			Jetpack::activate_module( $module_slug, false, false );
			Jetpack::state( 'message', 'no_message' );

			//A Jetpack module is being activated through a JITM, track it
			$this->stat( 'jitm', $module_slug.'-activated-' . JETPACK__VERSION );
			$this->do_stats( 'server_side' );

			wp_send_json_success();
		}
		if ( isset( $_REQUEST['jitmActionToTake'] ) && 'dismiss' == $_REQUEST['jitmActionToTake'] ) {
			// get the hide_jitm options array
			$jetpack_hide_jitm = Jetpack_Options::get_option( 'hide_jitm' );
			$module_slug = $_REQUEST['jitmModule'];

			if( ! $jetpack_hide_jitm ) {
				$jetpack_hide_jitm = array(
					$module_slug => 'hide'
				);
			} else {
				$jetpack_hide_jitm[$module_slug] = 'hide';
			}

			Jetpack_Options::update_option( 'hide_jitm', $jetpack_hide_jitm );

			//jitm is being dismissed forever, track it
			$this->stat( 'jitm', $module_slug.'-dismissed-' . JETPACK__VERSION );
			$this->do_stats( 'server_side' );

			wp_send_json_success();
		}
		if ( isset( $_REQUEST['jitmActionToTake'] ) && 'launch' == $_REQUEST['jitmActionToTake'] ) {
			$module_slug = $_REQUEST['jitmModule'];

			// User went to WordPress.com, track this
			$this->stat( 'jitm', $module_slug.'-wordpress-tools-' . JETPACK__VERSION );
			$this->do_stats( 'server_side' );

			wp_send_json_success();
		}
	}

	/**
	 * If there are any stats that need to be pushed, but haven't been, push them now.
	 */
	function __destruct() {
		if ( ! empty( $this->stats ) ) {
			$this->do_stats( 'server_side' );
		}
	}

	function jetpack_custom_caps( $caps, $cap, $user_id, $args ) {

The parameter $user_id is not used and could be removed.

The parameter $args is not used and could be removed.

		switch( $cap ) {
			case 'jetpack_connect' :
			case 'jetpack_reconnect' :

There must be a comment when fall-through is intentional in a non-empty case body

				if ( Jetpack::is_development_mode() ) {
					$caps = array( 'do_not_allow' );
					break;
				}
				/**
				 * Pass through. If it's not development mode, these should match disconnect.
				 * Let users disconnect if it's development mode, just in case things glitch.
				 */
			case 'jetpack_disconnect' :
				/**
				 * In multisite, can individual site admins manage their own connection?
				 *
				 * Ideally, this should be extracted out to a separate filter in the Jetpack_Network class.
				 */
				if ( is_multisite() && ! is_super_admin() && is_plugin_active_for_network( 'jetpack/jetpack.php' ) ) {
					if ( ! Jetpack_Network::init()->get_option( 'sub-site-connection-override' ) ) {
						/**
						 * We need to update the option name -- it's terribly unclear which
						 * direction the override goes.
						 *
						 * @todo: Update the option name to `sub-sites-can-manage-own-connections`

Comment refers to a TODO task

						 */
						$caps = array( 'do_not_allow' );
						break;
					}
				}

				$caps = array( 'manage_options' );
				break;
			case 'jetpack_manage_modules' :
			case 'jetpack_activate_modules' :
			case 'jetpack_deactivate_modules' :
				$caps = array( 'manage_options' );
				break;
			case 'jetpack_configure_modules' :
				$caps = array( 'manage_options' );
				break;
			case 'jetpack_network_admin_page':
			case 'jetpack_network_settings_page':
				$caps = array( 'manage_network_plugins' );
				break;
			case 'jetpack_network_sites_page':
				$caps = array( 'manage_sites' );
				break;
			case 'jetpack_admin_page' :

There must be a comment when fall-through is intentional in a non-empty case body

				if ( Jetpack::is_development_mode() ) {
					$caps = array( 'manage_options' );
					break;
				}

				// Don't ever show to subscribers, but allow access to the page if they're trying to unlink.
				if ( ! current_user_can( 'edit_posts' ) ) {
					if ( isset( $_GET['redirect'] ) && 'sub-unlink' == $_GET['redirect'] ) {
						// We need this in order to unlink the user.
						$this->admin_page_load();
					}
					if ( ! wp_verify_nonce( 'jetpack-unlink' ) ) {
						$caps = array( 'do_not_allow' );
						break;
					}
				}

				if ( ! self::is_active() && ! current_user_can( 'jetpack_connect' ) ) {
					$caps = array( 'do_not_allow' );
					break;
				}
				/**
				 * Pass through. If it's not development mode, these should match the admin page.
				 * Let users disconnect if it's development mode, just in case things glitch.
				 */
			case 'jetpack_connect_user' :
				if ( Jetpack::is_development_mode() ) {
					$caps = array( 'do_not_allow' );
					break;
				}
				$caps = array( 'read' );
				break;
		}
		return $caps;
	}

	function require_jetpack_authentication() {
		// Don't let anyone authenticate
		$_COOKIE = array();
		remove_all_filters( 'authenticate' );

		/**
		 * For the moment, remove Limit Login Attempts if its xmlrpc for Jetpack.
		 * If Limit Login Attempts is installed as a mu-plugin, it can occasionally
		 * generate false-positives.
		 */
		remove_filter( 'wp_login_failed', 'limit_login_failed' );

		if ( Jetpack::is_active() ) {
			// Allow Jetpack authentication
			add_filter( 'authenticate', array( $this, 'authenticate_jetpack' ), 10, 3 );
		}
	}

	/**
	 * Load language files
	 */
	public static function plugin_textdomain() {
		// Note to self, the third argument must not be hardcoded, to account for relocated folders.
		load_plugin_textdomain( 'jetpack', false, dirname( plugin_basename( JETPACK__PLUGIN_FILE ) ) . '/languages/' );
	}

	/**
	 * Register assets for use in various modules and the Jetpack admin page.
	 *
	 * @uses wp_script_is, wp_register_script, plugins_url
	 * @action wp_loaded
	 * @return null
	 */
	public function register_assets() {
		if ( ! wp_script_is( 'spin', 'registered' ) ) {
			wp_register_script( 'spin', plugins_url( '_inc/spin.js', JETPACK__PLUGIN_FILE ), false, '1.3' );
		}

		if ( ! wp_script_is( 'jquery.spin', 'registered' ) ) {
			wp_register_script( 'jquery.spin', plugins_url( '_inc/jquery.spin.js', JETPACK__PLUGIN_FILE ) , array( 'jquery', 'spin' ), '1.3' );
		}

		if ( ! wp_script_is( 'jetpack-gallery-settings', 'registered' ) ) {
			wp_register_script( 'jetpack-gallery-settings', plugins_url( '_inc/gallery-settings.js', JETPACK__PLUGIN_FILE ), array( 'media-views' ), '20121225' );
		}

		/**
		 * As jetpack_register_genericons is by default fired off a hook,
		 * the hook may have already fired by this point.
		 * So, let's just trigger it manually.
		 */
		require_once( JETPACK__PLUGIN_DIR . '_inc/genericons.php' );
		jetpack_register_genericons();

		if ( ! wp_style_is( 'jetpack-icons', 'registered' ) )
			wp_register_style( 'jetpack-icons', plugins_url( 'css/jetpack-icons.min.css', JETPACK__PLUGIN_FILE ), false, JETPACK__VERSION );
	}

	/**
	 * Device Pixels support
	 * This improves the resolution of gravatars and wordpress.com uploads on hi-res and zoomed browsers.
	 */
	function devicepx() {
		if ( Jetpack::is_active() ) {
			wp_enqueue_script( 'devicepx', set_url_scheme( 'http://s0.wp.com/wp-content/js/devicepx-jetpack.js' ), array(), gmdate( 'oW' ), true );
		}
	}

	/*
	 * Returns the location of Jetpack's lib directory. This filter is applied
	 * in require_lib().
	 *
	 * @filter require_lib_dir
	 */
	function require_lib_dir() {
		return JETPACK__PLUGIN_DIR . '_inc/lib';
	}

	/**
	 * Return the network_site_url so that .com knows what network this site is a part of.
	 * @param  bool $option
	 * @return string
	 */
	public function jetpack_main_network_site_option( $option ) {

The parameter $option is not used and could be removed.

		return network_site_url();
	}
	/**
	 * Network Name.
	 */
	static function network_name( $option = null ) {

The parameter $option is not used and could be removed.

		global $current_site;
		return $current_site->site_name;
	}
	/**
	 * Does the network allow new user and site registrations.
	 * @return string
	 */
	static function network_allow_new_registrations( $option = null ) {

The parameter $option is not used and could be removed.

		return ( in_array( get_site_option( 'registration' ), array('none', 'user', 'blog', 'all' ) ) ? get_site_option( 'registration') : 'none' );
	}
	/**
	 * Does the network allow admins to add new users.
	 * @return boolian
	 */
	static function network_add_new_users( $option = null ) {

The parameter $option is not used and could be removed.

		return (bool) get_site_option( 'add_new_users' );
	}
	/**
	 * File upload psace left per site in MB.
	 *  -1 means NO LIMIT.
	 * @return number
	 */
	static function network_site_upload_space( $option = null ) {

The parameter $option is not used and could be removed.

		// value in MB
		return ( get_site_option( 'upload_space_check_disabled' ) ? -1 : get_space_allowed() );
	}

	/**
	 * Network allowed file types.
	 * @return string
	 */
	static function network_upload_file_types( $option = null ) {

The parameter $option is not used and could be removed.

		return get_site_option( 'upload_filetypes', 'jpg jpeg png gif' );
	}

	/**
	 * Maximum file upload size set by the network.
	 * @return number
	 */
	static function network_max_upload_file_size( $option = null ) {

The parameter $option is not used and could be removed.

		// value in KB
		return get_site_option( 'fileupload_maxk', 300 );
	}

	/**
	 * Lets us know if a site allows admins to manage the network.
	 * @return array
	 */
	static function network_enable_administration_menus( $option = null ) {

The parameter $option is not used and could be removed.

		return get_site_option( 'menu_items' );
	}

	/**
	 * Return whether we are dealing with a multi network setup or not.
	 * The reason we are type casting this is because we want to avoid the situation where
	 * the result is false since when is_main_network_option return false it cases
	 * the rest the get_option( 'jetpack_is_multi_network' ); to return the value that is set in the
	 * database which could be set to anything as opposed to what this function returns.
	 * @param  bool  $option
	 *
	 * @return boolean
	 */
	public function is_main_network_option( $option ) {

The parameter $option is not used and could be removed.

		// return '1' or ''

50% of this comment could be valid code. Did you maybe forget this after debugging?

		return (string) (bool) Jetpack::is_multi_network();
	}

	/**
	 * Return true if we are with multi-site or multi-network false if we are dealing with single site.
	 *
	 * @param  string  $option
	 * @return boolean
	 */
	public function is_multisite( $option ) {

The parameter $option is not used and could be removed.

		return (string) (bool) is_multisite();
	}

	/**
	 * Implemented since there is no core is multi network function
	 * Right now there is no way to tell if we which network is the dominant network on the system
	 *
	 * @since  3.3
	 * @return boolean
	 */
	public static function is_multi_network() {
		global  $wpdb;

		// if we don't have a multi site setup no need to do any more
		if ( ! is_multisite() ) {
			return false;
		}

		$num_sites = $wpdb->get_var( "SELECT COUNT(*) FROM {$wpdb->site}" );
		if ( $num_sites > 1 ) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Trigger an update to the main_network_site when we update the siteurl of a site.
	 * @return null
	 */
	function update_jetpack_main_network_site_option() {
		// do_action( 'add_option_$option', '$option', '$value-of-the-option' );

58% of this comment could be valid code. Did you maybe forget this after debugging?

		/**
		 * Fires when the site URL is updated.
		 * Determines if the site is the main site of a Mulitiste network.
		 *
		 * @since 3.3.0
		 *
		 * @param string jetpack_main_network_site.
		 * @param string network_site_url() Site URL for the "main" site of the current Multisite network.
		 */
		do_action( 'add_option_jetpack_main_network_site', 'jetpack_main_network_site', network_site_url() );
		/**
		 * Fires when the site URL is updated.
		 * Determines if the is part of a multi network.
		 *
		 * @since 3.3.0
		 *
		 * @param string jetpack_is_main_network.
		 * @param bool Jetpack::is_multi_network() Is the site part of a multi network.
		 */
		do_action( 'add_option_jetpack_is_main_network', 'jetpack_is_main_network', (string) (bool) Jetpack::is_multi_network() );
		/**
		 * Fires when the site URL is updated.
		 * Determines if the site is part of a multisite network.
		 *
		 * @since 3.4.0
		 *
		 * @param string jetpack_is_multi_site.
		 * @param bool is_multisite() Is the site part of a mutlisite network.
		 */
		do_action( 'add_option_jetpack_is_multi_site', 'jetpack_is_multi_site', (string) (bool) is_multisite() );
	}
	/**
	 * Triggered after a user updates the network settings via Network Settings Admin Page
	 *
	 */
	function update_jetpack_network_settings() {
		// Only sync this info for the main network site.
		do_action( 'add_option_jetpack_network_name', 'jetpack_network_name', Jetpack::network_name() );
		do_action( 'add_option_jetpack_network_allow_new_registrations', 'jetpack_network_allow_new_registrations', Jetpack::network_allow_new_registrations() );
		do_action( 'add_option_jetpack_network_add_new_users', 'jetpack_network_add_new_users', Jetpack::network_add_new_users() );
		do_action( 'add_option_jetpack_network_site_upload_space', 'jetpack_network_site_upload_space', Jetpack::network_site_upload_space() );
		do_action( 'add_option_jetpack_network_upload_file_types', 'jetpack_network_upload_file_types', Jetpack::network_upload_file_types() );
		do_action( 'add_option_jetpack_network_enable_administration_menus', 'jetpack_network_enable_administration_menus', Jetpack::network_enable_administration_menus() );

	}

	/**
	 * Get back if the current site is single user site.
	 *
	 * @return bool
	 */
	public static function is_single_user_site() {

		$user_query = new WP_User_Query( array(
			'blog_id' => get_current_blog_id(),
			'fields'  => 'ID',
			'number' => 2
		) );
		return 1 === (int) $user_query->get_total();
	}

	/**
	 * Returns true if the site has file write access false otherwise.
	 * @return string ( '1' | '0' )
	 **/
	public static function file_system_write_access() {
		if ( ! function_exists( 'get_filesystem_method' ) ) {
			require_once( ABSPATH . 'wp-admin/includes/file.php' );
		}

		require_once( ABSPATH . 'wp-admin/includes/template.php' );

		$filesystem_method = get_filesystem_method();
		if ( $filesystem_method === 'direct' ) {
			return 1;
		}

		ob_start();
		$filesystem_credentials_are_stored = request_filesystem_credentials( self_admin_url() );
		ob_end_clean();
		if ( $filesystem_credentials_are_stored ) {
			return 1;
		}
		return 0;
	}

	/**
	 * Finds out if a site is using a version control system.
	 * @return string ( '1' | '0' )
	 **/
	public static function is_version_controlled() {

		if ( !class_exists( 'WP_Automatic_Updater' ) ) {
			require_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
		}
		$updater = new WP_Automatic_Updater();
		$is_version_controlled = strval( $updater->is_vcs_checkout( $context = ABSPATH ) );
		// transients should not be empty
		if ( empty( $is_version_controlled ) ) {
			$is_version_controlled = '0';
		}
		return $is_version_controlled;
	}

	/**
	 * Determines whether the current theme supports featured images or not.
	 * @return string ( '1' | '0' )
	 */
	public static function featured_images_enabled() {
		return current_theme_supports( 'post-thumbnails' ) ? '1' : '0';
	}

	/*
	 * Sync back wp_version
	 */
	public static function get_wp_version() {
		global $wp_version;
		return $wp_version;
	}

	/**
	 * Keeps wp_version in sync with .com when WordPress core updates
	 **/
	public static function update_get_wp_version( $update, $meta_data ) {
		if ( 'update' === $meta_data['action'] && 'core' === $meta_data['type'] ) {
			/** This action is documented in wp-includes/option.php */
			/**
			 * This triggers the sync for the jetpack version
			 * See Jetpack_Sync options method for more info.
			 */
			do_action( 'add_option_jetpack_wp_version', 'jetpack_wp_version', (string) Jetpack::get_wp_version() );
		}
	}

	/**
	 * Triggers a sync of update counts and update details
	 */
	function sync_update_data() {
		// Anytime WordPress saves update data, we'll want to sync update data
		add_action( 'set_site_transient_update_plugins', array( 'Jetpack', 'refresh_update_data' ) );
		add_action( 'set_site_transient_update_themes', array( 'Jetpack', 'refresh_update_data' ) );
		add_action( 'set_site_transient_update_core', array( 'Jetpack', 'refresh_update_data' ) );
		// Anytime a connection to jetpack is made, sync the update data
		add_action( 'jetpack_site_registered', array( 'Jetpack', 'refresh_update_data' ) );
		// Anytime the Jetpack Version changes, sync the the update data
		add_action( 'updating_jetpack_version', array( 'Jetpack', 'refresh_update_data' ) );

		if ( current_user_can( 'update_core' ) && current_user_can( 'update_plugins' ) && current_user_can( 'update_themes' ) ) {
			$this->sync->mock_option( 'updates', array( 'Jetpack', 'get_updates' ) );
		}

		$this->sync->mock_option( 'update_details', array( 'Jetpack', 'get_update_details' ) );
	}

	/**
	 * Triggers a sync of information specific to the current theme.
	 */
	function sync_theme_data() {
		add_action( 'switch_theme', array( 'Jetpack', 'refresh_theme_data' ) );
		$this->sync->mock_option( 'featured_images_enabled', array( 'Jetpack', 'featured_images_enabled' ) );
	}

	/**
	 * jetpack_updates is saved in the following schema:
	 *
	 * array (
	 *      'plugins'                       => (int) Number of plugin updates available.
	 *      'themes'                        => (int) Number of theme updates available.
	 *      'wordpress'                     => (int) Number of WordPress core updates available.
	 *      'translations'                  => (int) Number of translation updates available.
	 *      'total'                         => (int) Total of all available updates.
	 *      'wp_update_version'             => (string) The latest available version of WordPress, only present if a WordPress update is needed.
	 * )
	 * @return array
	 */
	public static function get_updates() {
		$update_data = wp_get_update_data();

		// Stores the individual update counts as well as the total count.
		if ( isset( $update_data['counts'] ) ) {
			$updates = $update_data['counts'];
		}

		// If we need to update WordPress core, let's find the latest version number.
		if ( ! empty( $updates['wordpress'] ) ) {
			$cur = get_preferred_from_update_core();
			if ( isset( $cur->response ) && 'upgrade' === $cur->response ) {
				$updates['wp_update_version'] = $cur->current;
			}
		}
		return isset( $updates ) ? $updates : array();
	}

	public static function get_update_details() {
		$update_details = array(
			'update_core' => get_site_transient( 'update_core' ),
			'update_plugins' => get_site_transient( 'update_plugins' ),
			'update_themes' => get_site_transient( 'update_themes' ),
		);
		return $update_details;
	}

	public static function refresh_update_data() {
		if ( current_user_can( 'update_core' ) && current_user_can( 'update_plugins' ) && current_user_can( 'update_themes' ) ) {
			/**
			 * Fires whenever the amount of updates needed for a site changes.
			 * Syncs an array that includes the number of theme, plugin, and core updates available, as well as the latest core version available.
			 *
			 * @since 3.7.0
			 *
			 * @param string jetpack_updates
			 * @param array Update counts calculated by Jetpack::get_updates
			 */
			do_action( 'add_option_jetpack_updates', 'jetpack_updates', Jetpack::get_updates() );
		}
		/**
		 * Fires whenever the amount of updates needed for a site changes.
		 * Syncs an array of core, theme, and plugin data, and which of each is out of date
		 *
		 * @since 3.7.0
		 *
		 * @param string jetpack_update_details
		 * @param array Update details calculated by Jetpack::get_update_details
		 */
		do_action( 'add_option_jetpack_update_details', 'jetpack_update_details', Jetpack::get_update_details() );
	}

	public static function refresh_theme_data() {
		/**
		 * Fires whenever a theme change is made.
		 *
		 * @since 3.8.1
		 *
		 * @param string featured_images_enabled
		 * @param boolean Whether featured images are enabled or not
		 */
		do_action( 'add_option_jetpack_featured_images_enabled', 'jetpack_featured_images_enabled', Jetpack::featured_images_enabled() );
	}

	/**
	 * Invalides the transient as well as triggers the update of the mock option.
	 *
	 * @return null
	 */
	function is_single_user_site_invalidate() {
		/**
		 * Fires when a user is added or removed from a site.
		 * Determines if the site is a single user site.
		 *
		 * @since 3.4.0
		 *
		 * @param string jetpack_single_user_site.
		 * @param bool Jetpack::is_single_user_site() Is the current site a single user site.
		 */
		do_action( 'update_option_jetpack_single_user_site', 'jetpack_single_user_site', (bool) Jetpack::is_single_user_site() );
	}

	/**
	 * Is Jetpack active?
	 */
	public static function is_active() {
		return (bool) Jetpack_Data::get_access_token( JETPACK_MASTER_USER );
	}

	/**
	 * Is Jetpack in development (offline) mode?
	 */
	public static function is_development_mode() {
		$development_mode = false;

		if ( defined( 'JETPACK_DEV_DEBUG' ) ) {
			$development_mode = JETPACK_DEV_DEBUG;
		}

		elseif ( site_url() && false === strpos( site_url(), '.' ) ) {
			$development_mode = true;
		}
		/**
		 * Filters Jetpack's development mode.
		 *
		 * @see http://jetpack.me/support/development-mode/
		 *
		 * @since 2.2.1
		 *
		 * @param bool $development_mode Is Jetpack's development mode active.
		 */
		return apply_filters( 'jetpack_development_mode', $development_mode );
	}

	/**
	* Get Jetpack development mode notice text and notice class.
	*
	* Mirrors the checks made in Jetpack::is_development_mode
	*
	*/
	public static function show_development_mode_notice() {
		if ( Jetpack::is_development_mode() ) {
			if ( defined( 'JETPACK_DEV_DEBUG' ) && JETPACK_DEV_DEBUG ) {
				$notice = sprintf(
					/* translators: %s is a URL */
					__( 'In <a href="%s" target="_blank">Development Mode</a>, via the JETPACK_DEV_DEBUG constant being defined in wp-config.php or elsewhere.', 'jetpack' ),
					'http://jetpack.me/support/development-mode/'
				);
			} elseif ( site_url() && false === strpos( site_url(), '.' ) ) {
				$notice = sprintf(
					/* translators: %s is a URL */
					__( 'In <a href="%s" target="_blank">Development Mode</a>, via site URL lacking a dot (e.g. http://localhost).', 'jetpack' ),
					'http://jetpack.me/support/development-mode/'
				);
			} else {
				$notice = sprintf(
					/* translators: %s is a URL */
					__( 'In <a href="%s" target="_blank">Development Mode</a>, via the jetpack_development_mode filter.', 'jetpack' ),
					'http://jetpack.me/support/development-mode/'
				);
			}

			echo '<div class="updated" style="border-color: #f0821e;"><p>' . $notice . '</p></div>';
		}

		// Throw up a notice if using a development version and as for feedback.
		if ( Jetpack::is_development_version() ) {
			/* translators: %s is a URL */
			$notice = sprintf( __( 'You are currently running a development version of Jetpack. <a href="%s" target="_blank">Submit your feedback</a>', 'jetpack' ), 'https://jetpack.me/contact-support/beta-group/' );

			echo '<div class="updated" style="border-color: #f0821e;"><p>' . $notice . '</p></div>';
		}
	}

	/**
	 * Whether Jetpack's version maps to a public release, or a development version.
	 */
	public static function is_development_version() {
		return ! preg_match( '/^\d+(\.\d+)+$/', JETPACK__VERSION );
	}

	/**
	 * Is a given user (or the current user if none is specified) linked to a WordPress.com user?
	 */
	public static function is_user_connected( $user_id = false ) {
		$user_id = false === $user_id ? get_current_user_id() : absint( $user_id );
		if ( ! $user_id ) {
			return false;
		}
		return (bool) Jetpack_Data::get_access_token( $user_id );
	}

	/**
	 * Get the wpcom user data of the current|specified connected user.
	 */
	public static function get_connected_user_data( $user_id = null ) {
		if ( ! $user_id ) {
			$user_id = get_current_user_id();
		}
		Jetpack::load_xml_rpc_client();
		$xml = new Jetpack_IXR_Client( array(
			'user_id' => $user_id,
		) );
		$xml->query( 'wpcom.getUser' );
		if ( ! $xml->isError() ) {
			return $xml->getResponse();
		}
		return false;
	}

	/**
	 * Get the wpcom email of the current|specified connected user.
	 */
	public static function get_connected_user_email( $user_id = null ) {
		if ( ! $user_id ) {
			$user_id = get_current_user_id();
		}
		Jetpack::load_xml_rpc_client();
		$xml = new Jetpack_IXR_Client( array(
			'user_id' => $user_id,
		) );
		$xml->query( 'wpcom.getUserEmail' );
		if ( ! $xml->isError() ) {
			return $xml->getResponse();
		}
		return false;
	}

	/**
	 * Get the wpcom email of the master user.
	 */
	public static function get_master_user_email() {
		$master_user_id = Jetpack_Options::get_option( 'master_user' );
		if ( $master_user_id ) {
			return self::get_connected_user_email( $master_user_id );
		}
		return '';
	}

	function current_user_is_connection_owner() {
		$user_token = Jetpack_Data::get_access_token( JETPACK_MASTER_USER );
		return $user_token && is_object( $user_token ) && isset( $user_token->external_user_id ) && get_current_user_id() === $user_token->external_user_id;
	}

	/**
	 * Add any extra oEmbed providers that we know about and use on wpcom for feature parity.
	 */
	function extra_oembed_providers() {
		// Cloudup: https://dev.cloudup.com/#oembed
		wp_oembed_add_provider( 'https://cloudup.com/*' , 'https://cloudup.com/oembed' );
		wp_oembed_add_provider( 'https://me.sh/*', 'https://me.sh/oembed?format=json' );
		wp_oembed_add_provider( '#https?://(www\.)?gfycat\.com/.*#i', 'https://api.gfycat.com/v1/oembed', true );
		wp_oembed_add_provider( '#https?://[^.]+\.(wistia\.com|wi\.st)/(medias|embed)/.*#', 'https://fast.wistia.com/oembed', true );
	}

	/**
	 * Synchronize connected user role changes
	 */
	function user_role_change( $user_id ) {
		if ( Jetpack::is_active() && Jetpack::is_user_connected( $user_id ) ) {
			$current_user_id = get_current_user_id();
			wp_set_current_user( $user_id );
			$role = $this->translate_current_user_to_role();
			$signed_role = $this->sign_role( $role );
			wp_set_current_user( $current_user_id );

			$master_token   = Jetpack_Data::get_access_token( JETPACK_MASTER_USER );
			$master_user_id = absint( $master_token->external_user_id );

			if ( ! $master_user_id )
				return; // this shouldn't happen

			Jetpack::xmlrpc_async_call( 'jetpack.updateRole', $user_id, $signed_role );
			//@todo retry on failure

Comments for TODO tasks are often forgotten in the code; it might be better to use a dedicated issue tracker.

			//try to choose a new master if we're demoting the current one
			if ( $user_id == $master_user_id && 'administrator' != $role ) {
				$query = new WP_User_Query(
					array(
						'fields'  => array( 'id' ),
						'role'    => 'administrator',
						'orderby' => 'id',
						'exclude' => array( $master_user_id ),
					)
				);
				$new_master = false;
				foreach ( $query->results as $result ) {
					$uid = absint( $result->id );
					if ( $uid && Jetpack::is_user_connected( $uid ) ) {
						$new_master = $uid;
						break;
					}
				}

				if ( $new_master ) {
					Jetpack_Options::update_option( 'master_user', $new_master );
				}
				// else disconnect..?
			}
		}
	}

	/**
	 * Loads the currently active modules.
	 */
	public static function load_modules() {
		if ( ! self::is_active() && !self::is_development_mode() ) {
			if ( ! is_multisite() || ! get_site_option( 'jetpack_protect_active' ) ) {
				return;
			}
		}

		$version = Jetpack_Options::get_option( 'version' );
		if ( ! $version ) {
			$version = $old_version = JETPACK__VERSION . ':' . time();
			/** This action is documented in class.jetpack.php */
			do_action( 'updating_jetpack_version', $version, false );
			Jetpack_Options::update_options( compact( 'version', 'old_version' ) );
		}
		list( $version ) = explode( ':', $version );

		$modules = array_filter( Jetpack::get_active_modules(), array( 'Jetpack', 'is_module' ) );

		$modules_data = array();

		// Don't load modules that have had "Major" changes since the stored version until they have been deactivated/reactivated through the lint check.
		if ( version_compare( $version, JETPACK__VERSION, '<' ) ) {
			$updated_modules = array();
			foreach ( $modules as $module ) {
				$modules_data[ $module ] = Jetpack::get_module( $module );
				if ( ! isset( $modules_data[ $module ]['changed'] ) ) {
					continue;
				}

				if ( version_compare( $modules_data[ $module ]['changed'], $version, '<=' ) ) {
					continue;
				}

				$updated_modules[] = $module;
			}

			$modules = array_diff( $modules, $updated_modules );
		}

		$is_development_mode = Jetpack::is_development_mode();

		foreach ( $modules as $module ) {
			// If we're in dev mode, disable modules requiring a connection
			if ( $is_development_mode ) {
				// Prime the pump if we need to
				if ( empty( $modules_data[ $module ] ) ) {
					$modules_data[ $module ] = Jetpack::get_module( $module );
				}
				// If the module requires a connection, but we're in local mode, don't include it.
				if ( $modules_data[ $module ]['requires_connection'] ) {
					continue;
				}
			}

			if ( did_action( 'jetpack_module_loaded_' . $module ) ) {
				continue;
			}

			require Jetpack::get_module_path( $module );
			/**
			 * Fires when a specific module is loaded.
			 * The dynamic part of the hook, $module, is the module slug.
			 *
			 * @since 1.1.0
			 */
			do_action( 'jetpack_module_loaded_' . $module );
		}

		/**
		 * Fires when all the modules are loaded.
		 *
		 * @since 1.1.0
		 */
		do_action( 'jetpack_modules_loaded' );

		// Load module-specific code that is needed even when a module isn't active. Loaded here because code contained therein may need actions such as setup_theme.
		if ( Jetpack::is_active() || Jetpack::is_development_mode() )
			require_once( JETPACK__PLUGIN_DIR . 'modules/module-extras.php' );
	}

	/**
	 * Check if Jetpack's REST API compat file should be included
	 * @action plugins_loaded
	 * @return null
	 */
	public function check_rest_api_compat() {
		/**
		 * Filters the list of REST API compat files to be included.
		 *
		 * @since 2.2.5
		 *
		 * @param array $args Array of REST API compat files to include.
		 */
		$_jetpack_rest_api_compat_includes = apply_filters( 'jetpack_rest_api_compat', array() );

		if ( function_exists( 'bbpress' ) )
			$_jetpack_rest_api_compat_includes[] = JETPACK__PLUGIN_DIR . 'class.jetpack-bbpress-json-api-compat.php';

		foreach ( $_jetpack_rest_api_compat_includes as $_jetpack_rest_api_compat_include )
			require_once $_jetpack_rest_api_compat_include;
	}

	/**
	 * Gets all plugins currently active in values, regardless of whether they're
	 * traditionally activated or network activated.
	 *
	 * @todo Store the result in core's object cache maybe?

Comment refers to a TODO task

	 */
	public static function get_active_plugins() {
		$active_plugins = (array) get_option( 'active_plugins', array() );

		if ( is_multisite() ) {
			// Due to legacy code, active_sitewide_plugins stores them in the keys,
			// whereas active_plugins stores them in the values.
			$network_plugins = array_keys( get_site_option( 'active_sitewide_plugins', array() ) );
			if ( $network_plugins ) {

The expression $network_plugins of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

				$active_plugins = array_merge( $active_plugins, $network_plugins );
			}
		}

		sort( $active_plugins );

		return array_unique( $active_plugins );
	}

	/**
	 * Gets and parses additional plugin data to send with the heartbeat data
	 *
	 * @since 3.8.1
	 *
	 * @return array Array of plugin data
	 */
	public static function get_parsed_plugin_data() {
		if ( ! function_exists( 'get_plugins' ) ) {
			require_once( ABSPATH . 'wp-admin/includes/plugin.php' );
		}
		$all_plugins    = get_plugins();
		$active_plugins = Jetpack::get_active_plugins();

		$plugins = array();
		foreach ( $all_plugins as $path => $plugin_data ) {
			$plugins[ $path ] = array(
					'is_active' => in_array( $path, $active_plugins ),
					'file'      => $path,
					'name'      => $plugin_data['Name'],
					'version'   => $plugin_data['Version'],
					'author'    => $plugin_data['Author'],
			);
		}

		return $plugins;
	}

	/**
	 * Gets and parses theme data to send with the heartbeat data
	 *
	 * @since 3.8.1
	 *
	 * @return array Array of theme data
	 */
	public static function get_parsed_theme_data() {
		$all_themes = wp_get_themes( array( 'allowed' => true ) );
		$header_keys = array( 'Name', 'Author', 'Version', 'ThemeURI', 'AuthorURI', 'Status', 'Tags' );

		$themes = array();
		foreach ( $all_themes as $slug => $theme_data ) {
			$theme_headers = array();
			foreach ( $header_keys as $header_key ) {
				$theme_headers[ $header_key ] = $theme_data->get( $header_key );
			}

			$themes[ $slug ] = array(
					'is_active_theme' => $slug == wp_get_theme()->get_template(),
					'slug' => $slug,
					'theme_root' => $theme_data->get_theme_root_uri(),
					'parent' => $theme_data->parent(),
					'headers' => $theme_headers
			);
		}

		return $themes;
	}

	/**
	 * Checks whether a specific plugin is active.
	 *
	 * We don't want to store these in a static variable, in case
	 * there are switch_to_blog() calls involved.
	 */
	public static function is_plugin_active( $plugin = 'jetpack/jetpack.php' ) {
		return in_array( $plugin, self::get_active_plugins() );
	}

	/**
	 * Check if Jetpack's Open Graph tags should be used.
	 * If certain plugins are active, Jetpack's og tags are suppressed.
	 *
	 * @uses Jetpack::get_active_modules, add_filter, get_option, apply_filters
	 * @action plugins_loaded
	 * @return null
	 */
	public function check_open_graph() {
		if ( in_array( 'publicize', Jetpack::get_active_modules() ) || in_array( 'sharedaddy', Jetpack::get_active_modules() ) ) {
			add_filter( 'jetpack_enable_open_graph', '__return_true', 0 );
		}

		$active_plugins = self::get_active_plugins();

		if ( ! empty( $active_plugins ) ) {
			foreach ( $this->open_graph_conflicting_plugins as $plugin ) {
				if ( in_array( $plugin, $active_plugins ) ) {
					add_filter( 'jetpack_enable_open_graph', '__return_false', 99 );
					break;
				}
			}
		}

		/**
		 * Allow the addition of Open Graph Meta Tags to all pages.
		 *
		 * @since 2.0.3
		 *
		 * @param bool false Should Open Graph Meta tags be added. Default to false.
		 */
		if ( apply_filters( 'jetpack_enable_open_graph', false ) ) {
			require_once JETPACK__PLUGIN_DIR . 'functions.opengraph.php';
		}
	}

	/**
	 * Check if Jetpack's Twitter tags should be used.
	 * If certain plugins are active, Jetpack's twitter tags are suppressed.
	 *
	 * @uses Jetpack::get_active_modules, add_filter, get_option, apply_filters
	 * @action plugins_loaded
	 * @return null
	 */
	public function check_twitter_tags() {

		$active_plugins = self::get_active_plugins();

		if ( ! empty( $active_plugins ) ) {
			foreach ( $this->twitter_cards_conflicting_plugins as $plugin ) {
				if ( in_array( $plugin, $active_plugins ) ) {
					add_filter( 'jetpack_disable_twitter_cards', '__return_true', 99 );
					break;
				}
			}
		}

		/**
		 * Allow Twitter Card Meta tags to be disabled.
		 *
		 * @since 2.6.0
		 *
		 * @param bool true Should Twitter Card Meta tags be disabled. Default to true.
		 */
		if ( apply_filters( 'jetpack_disable_twitter_cards', true ) ) {
			require_once JETPACK__PLUGIN_DIR . 'class.jetpack-twitter-cards.php';
		}
	}




	/*

40% of this comment could be valid code. Did you maybe forget this after debugging?

	 *
	 * Jetpack Security Reports
	 *
	 * Allowed types: login_form, backup, file_scanning, spam
	 *
	 * Args for login_form and spam: 'blocked'=>(int)(optional), 'status'=>(string)(ok, warning, error), 'message'=>(optional, disregarded if status is ok, allowed tags: a, em, strong)
	 *
	 * Args for backup and file_scanning: 'last'=>(timestamp)(optional), 'next'=>(timestamp)(optional), 'status'=>(string)(ok, warning, error), 'message'=>(optional, disregarded if status is ok, allowed tags: a, em, strong)
	 *
	 *
	 * Example code to submit a security report:
	 *
	 *  function akismet_submit_jetpack_security_report() {
	 *  	Jetpack::submit_security_report( 'spam', __FILE__, $args = array( 'blocked' => 138284, status => 'ok' ) );
	 *  }
	 *  add_action( 'jetpack_security_report', 'akismet_submit_jetpack_security_report' );
	 *
	 */


	/**
	 * Calls for security report submissions.
	 *
	 * @return null
	 */
	public static function perform_security_reporting() {
		$no_check_needed = get_site_transient( 'security_report_performed_recently' );

		if ( $no_check_needed ) {
			return;
		}

		/**
		 * Fires before a security report is created.
		 *
		 * @since 3.4.0
		 */
		do_action( 'jetpack_security_report' );

		Jetpack_Options::update_option( 'security_report', self::$security_report );
		set_site_transient( 'security_report_performed_recently', 1, 15 * MINUTE_IN_SECONDS );
	}

	/**
	 * Allows plugins to submit security reports.
 	 *
	 * @param string  $type         Report type (login_form, backup, file_scanning, spam)
	 * @param string  $plugin_file  Plugin __FILE__, so that we can pull plugin data
	 * @param array   $args         See definitions above
	 */
	public static function submit_security_report( $type = '', $plugin_file = '', $args = array() ) {

		if( !doing_action( 'jetpack_security_report' ) ) {
			return new WP_Error( 'not_collecting_report', 'Not currently collecting security reports.  Please use the jetpack_security_report hook.' );
		}

		if( !is_string( $type ) || !is_string( $plugin_file ) ) {
			return new WP_Error( 'invalid_security_report', 'Invalid Security Report' );
		}

		if( !function_exists( 'get_plugin_data' ) ) {
			include( ABSPATH . 'wp-admin/includes/plugin.php' );
		}

		//Get rid of any non-allowed args
		$args = array_intersect_key( $args, array_flip( array( 'blocked', 'last', 'next', 'status', 'message' ) ) );

		$plugin = get_plugin_data( $plugin_file );

		if ( !$plugin['Name'] ) {
			return new WP_Error( 'security_report_missing_plugin_name', 'Invalid Plugin File Provided' );
		}

		// Sanitize everything to make sure we're not syncing something wonky
		$type = sanitize_key( $type );

		$args['plugin'] = $plugin;

		// Cast blocked, last and next as integers.
		// Last and next should be in unix timestamp format
		if ( isset( $args['blocked'] ) ) {
			$args['blocked'] = (int) $args['blocked'];
		}
		if ( isset( $args['last'] ) ) {
			$args['last'] = (int) $args['last'];
		}
		if ( isset( $args['next'] ) ) {
			$args['next'] = (int) $args['next'];
		}
		if ( !in_array( $args['status'], array( 'ok', 'warning', 'error' ) ) ) {
			$args['status'] = 'ok';
		}
		if ( isset( $args['message'] ) ) {

			if( $args['status'] == 'ok' ) {
				unset( $args['message'] );
			}

			$allowed_html = array(
			    'a' => array(
			        'href' => array(),
			        'title' => array()
			    ),
			    'em' => array(),
			    'strong' => array(),
			);

			$args['message'] = wp_kses( $args['message'], $allowed_html );
		}

		$plugin_name = $plugin[ 'Name' ];

		self::$security_report[ $type ][ $plugin_name ] = $args;
	}

	/**
	 * Collects a new report if needed, then returns it.
	 */
	public function get_security_report() {
		self::perform_security_reporting();
		return Jetpack_Options::get_option( 'security_report' );
	}


/* Jetpack Options API */

	public static function get_option_names( $type = 'compact' ) {
		return Jetpack_Options::get_option_names( $type );
	}

	/**
	 * Returns the requested option.  Looks in jetpack_options or jetpack_$name as appropriate.
 	 *
	 * @param string $name    Option name
	 * @param mixed  $default (optional)
	 */
	public static function get_option( $name, $default = false ) {
		return Jetpack_Options::get_option( $name, $default );
	}

	/**
	* Stores two secrets and a timestamp so WordPress.com can make a request back and verify an action
	* Does some extra verification so urls (such as those to public-api, register, etc) can't just be crafted
	* $name must be a registered option name.
	*/
	public static function create_nonce( $name ) {
		$secret = wp_generate_password( 32, false ) . ':' . wp_generate_password( 32, false ) . ':' . ( time() + 600 );

		Jetpack_Options::update_option( $name, $secret );
		@list( $secret_1, $secret_2, $eol ) = explode( ':', Jetpack_Options::get_option( $name ) );

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

		if ( empty( $secret_1 ) || empty( $secret_2 ) || $eol < time() )
			return new Jetpack_Error( 'missing_secrets' );

		return array(
			'secret_1' => $secret_1,
			'secret_2' => $secret_2,
			'eol'      => $eol,
		);
	}

	/**
	 * Updates the single given option.  Updates jetpack_options or jetpack_$name as appropriate.
 	 *
	 * @deprecated 3.4 use Jetpack_Options::update_option() instead.
	 * @param string $name  Option name
	 * @param mixed  $value Option value
	 */
	public static function update_option( $name, $value ) {
		_deprecated_function( __METHOD__, 'jetpack-3.4', 'Jetpack_Options::update_option()' );
		return Jetpack_Options::update_option( $name, $value );
	}

	/**
	 * Updates the multiple given options.  Updates jetpack_options and/or jetpack_$name as appropriate.
 	 *
	 * @deprecated 3.4 use Jetpack_Options::update_options() instead.
	 * @param array $array array( option name => option value, ... )
	 */
	public static function update_options( $array ) {
		_deprecated_function( __METHOD__, 'jetpack-3.4', 'Jetpack_Options::update_options()' );
		return Jetpack_Options::update_options( $array );
	}

	/**
	 * Deletes the given option.  May be passed multiple option names as an array.
	 * Updates jetpack_options and/or deletes jetpack_$name as appropriate.
	 *
	 * @deprecated 3.4 use Jetpack_Options::delete_option() instead.
	 * @param string|array $names
	 */
	public static function delete_option( $names ) {
		_deprecated_function( __METHOD__, 'jetpack-3.4', 'Jetpack_Options::delete_option()' );
		return Jetpack_Options::delete_option( $names );
	}

	/**
	 * Enters a user token into the user_tokens option
	 *
	 * @param int $user_id
	 * @param string $token
	 * return bool
	 */
	public static function update_user_token( $user_id, $token, $is_master_user ) {
		// not designed for concurrent updates
		$user_tokens = Jetpack_Options::get_option( 'user_tokens' );
		if ( ! is_array( $user_tokens ) )
			$user_tokens = array();
		$user_tokens[$user_id] = $token;
		if ( $is_master_user ) {
			$master_user = $user_id;
			$options     = compact( 'user_tokens', 'master_user' );
		} else {
			$options = compact( 'user_tokens' );
		}
		return Jetpack_Options::update_options( $options );
	}

	/**
	 * Returns an array of all PHP files in the specified absolute path.
	 * Equivalent to glob( "$absolute_path/*.php" ).
	 *
	 * @param string $absolute_path The absolute path of the directory to search.
	 * @return array Array of absolute paths to the PHP files.
	 */
	public static function glob_php( $absolute_path ) {
		if ( function_exists( 'glob' ) ) {
			return glob( "$absolute_path/*.php" );
		}

		$absolute_path = untrailingslashit( $absolute_path );
		$files = array();
		if ( ! $dir = @opendir( $absolute_path ) ) {
			return $files;
		}

		while ( false !== $file = readdir( $dir ) ) {
			if ( '.' == substr( $file, 0, 1 ) || '.php' != substr( $file, -4 ) ) {
				continue;
			}

			$file = "$absolute_path/$file";

			if ( ! is_file( $file ) ) {
				continue;
			}

			$files[] = $file;
		}

		closedir( $dir );

		return $files;
	}

	public static function activate_new_modules( $redirect = false ) {
		if ( ! Jetpack::is_active() && ! Jetpack::is_development_mode() ) {
			return;
		}

		$jetpack_old_version = Jetpack_Options::get_option( 'version' ); // [sic]
		if ( ! $jetpack_old_version ) {
			$jetpack_old_version = $version = $old_version = '1.1:' . time();
			/** This action is documented in class.jetpack.php */
			do_action( 'updating_jetpack_version', $version, false );
			Jetpack_Options::update_options( compact( 'version', 'old_version' ) );
		}

		list( $jetpack_version ) = explode( ':', $jetpack_old_version ); // [sic]

		if ( version_compare( JETPACK__VERSION, $jetpack_version, '<=' ) ) {
			return;
		}

		$active_modules     = Jetpack::get_active_modules();
		$reactivate_modules = array();
		foreach ( $active_modules as $active_module ) {
			$module = Jetpack::get_module( $active_module );
			if ( ! isset( $module['changed'] ) ) {
				continue;
			}

			if ( version_compare( $module['changed'], $jetpack_version, '<=' ) ) {
				continue;
			}

			$reactivate_modules[] = $active_module;
			Jetpack::deactivate_module( $active_module );
		}

		$new_version = JETPACK__VERSION . ':' . time();
		/** This action is documented in class.jetpack.php */
		do_action( 'updating_jetpack_version', $new_version, $jetpack_old_version );
		Jetpack_Options::update_options(
			array(
				'version'     => $new_version,
				'old_version' => $jetpack_old_version,
			)
		);

		Jetpack::state( 'message', 'modules_activated' );
		Jetpack::activate_default_modules( $jetpack_version, JETPACK__VERSION, $reactivate_modules );

JETPACK__VERSION is of type string, but the function expects a boolean.

		if ( $redirect ) {
			$page = 'jetpack'; // make sure we redirect to either settings or the jetpack page
			if ( isset( $_GET['page'] ) && in_array( $_GET['page'], array( 'jetpack', 'jetpack_modules' ) ) ) {
				$page = $_GET['page'];
			}

			wp_safe_redirect( Jetpack::admin_url( 'page=' . $page ) );
			exit;

The method activate_new_modules() contains an exit expression.

		}
	}

	/**
	 * List available Jetpack modules. Simply lists .php files in /modules/.
	 * Make sure to tuck away module "library" files in a sub-directory.
	 */
	public static function get_available_modules( $min_version = false, $max_version = false ) {
		static $modules = null;

		if ( ! isset( $modules ) ) {
			$available_modules_option = Jetpack_Options::get_option( 'available_modules', array() );
			// Use the cache if we're on the front-end and it's available...
			if ( ! is_admin() && ! empty( $available_modules_option[ JETPACK__VERSION ] ) ) {
				$modules = $available_modules_option[ JETPACK__VERSION ];
			} else {
				$files = Jetpack::glob_php( JETPACK__PLUGIN_DIR . 'modules' );

				$modules = array();

				foreach ( $files as $file ) {
					if ( ! $headers = Jetpack::get_module( $file ) ) {
						continue;
					}

					$modules[ Jetpack::get_module_slug( $file ) ] = $headers['introduced'];
				}

				Jetpack_Options::update_option( 'available_modules', array(
					JETPACK__VERSION => $modules,
				) );
			}
		}

		/**
		 * Filters the array of modules available to be activated.
		 *
		 * @since 2.4.0
		 *
		 * @param array $modules Array of available modules.
		 * @param string $min_version Minimum version number required to use modules.
		 * @param string $max_version Maximum version number required to use modules.
		 */
		$mods = apply_filters( 'jetpack_get_available_modules', $modules, $min_version, $max_version );

		if ( ! $min_version && ! $max_version ) {
			return array_keys( $mods );
		}

		$r = array();
		foreach ( $mods as $slug => $introduced ) {
			if ( $min_version && version_compare( $min_version, $introduced, '>=' ) ) {
				continue;
			}

			if ( $max_version && version_compare( $max_version, $introduced, '<' ) ) {
				continue;
			}

			$r[] = $slug;
		}

		return $r;
	}

	/**
	 * Default modules loaded on activation.
	 */
	public static function get_default_modules( $min_version = false, $max_version = false ) {
		$return = array();

		foreach ( Jetpack::get_available_modules( $min_version, $max_version ) as $module ) {
			$module_data = Jetpack::get_module( $module );

			switch ( strtolower( $module_data['auto_activate'] ) ) {
				case 'yes' :
					$return[] = $module;
					break;
				case 'public' :
					if ( Jetpack_Options::get_option( 'public' ) ) {
						$return[] = $module;
					}
					break;
				case 'no' :
				default :

There must be no space before the colon in a DEFAULT statement

					break;
			}
		}
		/**
		 * Filters the array of default modules.
		 *
		 * @since 2.5.0
		 *
		 * @param array $return Array of default modules.
		 * @param string $min_version Minimum version number required to use modules.
		 * @param string $max_version Maximum version number required to use modules.
		 */
		return apply_filters( 'jetpack_get_default_modules', $return, $min_version, $max_version );
	}

	/**
	 * Checks activated modules during auto-activation to determine
	 * if any of those modules are being deprecated.  If so, close
	 * them out, and add any replacement modules.
	 *
	 * Runs at priority 99 by default.
	 *
	 * This is run late, so that it can still activate a module if
	 * the new module is a replacement for another that the user
	 * currently has active, even if something at the normal priority
	 * would kibosh everything.
	 *
	 * @since 2.6
	 * @uses jetpack_get_default_modules filter
	 * @param array $modules
	 * @return array
	 */
	function handle_deprecated_modules( $modules ) {
		$deprecated_modules = array(
			'debug'            => null,  // Closed out and moved to ./class.jetpack-debugger.php
			'wpcc'             => 'sso', // Closed out in 2.6 -- SSO provides the same functionality.
			'gplus-authorship' => null,  // Closed out in 3.2 -- Google dropped support.
		);

		// Don't activate SSO if they never completed activating WPCC.
		if ( Jetpack::is_module_active( 'wpcc' ) ) {
			$wpcc_options = Jetpack_Options::get_option( 'wpcc_options' );
			if ( empty( $wpcc_options ) || empty( $wpcc_options['client_id'] ) || empty( $wpcc_options['client_id'] ) ) {
				$deprecated_modules['wpcc'] = null;
			}
		}

		foreach ( $deprecated_modules as $module => $replacement ) {
			if ( Jetpack::is_module_active( $module ) ) {
				self::deactivate_module( $module );
				if ( $replacement ) {

The expression $replacement of type null|string is loosely compared to true; this is ambiguous if the string can be empty. You might want to explicitly use !== null instead.

					$modules[] = $replacement;
				}
			}
		}

		return array_unique( $modules );
	}

	/**
	 * Checks activated plugins during auto-activation to determine
	 * if any of those plugins are in the list with a corresponding module
	 * that is not compatible with the plugin. The module will not be allowed
	 * to auto-activate.
	 *
	 * @since 2.6
	 * @uses jetpack_get_default_modules filter
	 * @param array $modules
	 * @return array
	 */
	function filter_default_modules( $modules ) {

		$active_plugins = self::get_active_plugins();

		if ( ! empty( $active_plugins ) ) {

			// For each module we'd like to auto-activate...
			foreach ( $modules as $key => $module ) {
				// If there are potential conflicts for it...
				if ( ! empty( $this->conflicting_plugins[ $module ] ) ) {
					// For each potential conflict...
					foreach ( $this->conflicting_plugins[ $module ] as $title => $plugin ) {
						// If that conflicting plugin is active...
						if ( in_array( $plugin, $active_plugins ) ) {
							// Remove that item from being auto-activated.
							unset( $modules[ $key ] );
						}
					}
				}
			}
		}

		return $modules;
	}

	/**
	 * Extract a module's slug from its full path.
	 */
	public static function get_module_slug( $file ) {
		return str_replace( '.php', '', basename( $file ) );
	}

	/**
	 * Generate a module's path from its slug.
	 */
	public static function get_module_path( $slug ) {
		return JETPACK__PLUGIN_DIR . "modules/$slug.php";
	}

	/**
	 * Load module data from module file. Headers differ from WordPress
	 * plugin headers to avoid them being identified as standalone
	 * plugins on the WordPress plugins page.
	 */
	public static function get_module( $module ) {
		$headers = array(
			'name'                      => 'Module Name',
			'description'               => 'Module Description',
			'jumpstart_desc'            => 'Jumpstart Description',
			'sort'                      => 'Sort Order',
			'recommendation_order'      => 'Recommendation Order',
			'introduced'                => 'First Introduced',
			'changed'                   => 'Major Changes In',
			'deactivate'                => 'Deactivate',
			'free'                      => 'Free',
			'requires_connection'       => 'Requires Connection',
			'auto_activate'             => 'Auto Activate',
			'module_tags'               => 'Module Tags',
			'feature'                   => 'Feature',
			'additional_search_queries' => 'Additional Search Queries',
		);

		$file = Jetpack::get_module_path( Jetpack::get_module_slug( $module ) );

		$mod = Jetpack::get_file_data( $file, $headers );
		if ( empty( $mod['name'] ) ) {
			return false;
		}

		$mod['sort']                    = empty( $mod['sort'] ) ? 10 : (int) $mod['sort'];
		$mod['recommendation_order']    = empty( $mod['recommendation_order'] ) ? 20 : (int) $mod['recommendation_order'];
		$mod['deactivate']              = empty( $mod['deactivate'] );
		$mod['free']                    = empty( $mod['free'] );
		$mod['requires_connection']     = ( ! empty( $mod['requires_connection'] ) && 'No' == $mod['requires_connection'] ) ? false : true;

		if ( empty( $mod['auto_activate'] ) || ! in_array( strtolower( $mod['auto_activate'] ), array( 'yes', 'no', 'public' ) ) ) {
			$mod['auto_activate'] = 'No';
		} else {
			$mod['auto_activate'] = (string) $mod['auto_activate'];
		}

		if ( $mod['module_tags'] ) {
			$mod['module_tags'] = explode( ',', $mod['module_tags'] );
			$mod['module_tags'] = array_map( 'trim', $mod['module_tags'] );
			$mod['module_tags'] = array_map( array( __CLASS__, 'translate_module_tag' ), $mod['module_tags'] );
		} else {
			$mod['module_tags'] = array( self::translate_module_tag( 'Other' ) );
		}

		if ( $mod['feature'] ) {
			$mod['feature'] = explode( ',', $mod['feature'] );
			$mod['feature'] = array_map( 'trim', $mod['feature'] );
		} else {
			$mod['feature'] = array( self::translate_module_tag( 'Other' ) );
		}

		/**
		 * Filters the feature array on a module.
		 *
		 * This filter allows you to control where each module is filtered: Recommended,
		 * Jumpstart, and the default "Other" listing.
		 *
		 * @since 3.5.0
		 *
		 * @param array   $mod['feature'] The areas to feature this module:
		 *     'Jumpstart' adds to the "Jumpstart" option to activate many modules at once.
		 *     'Recommended' shows on the main Jetpack admin screen.
		 *     'Other' should be the default if no other value is in the array.
		 * @param string  $module The slug of the module, e.g. sharedaddy.
		 * @param array   $mod All the currently assembled module data.
		 */
		$mod['feature'] = apply_filters( 'jetpack_module_feature', $mod['feature'], $module, $mod );

		/**
		 * Filter the returned data about a module.
		 *
		 * This filter allows overriding any info about Jetpack modules. It is dangerous,
		 * so please be careful.
		 *
		 * @since 3.6.0
		 *
		 * @param array   $mod    The details of the requested module.
		 * @param string  $module The slug of the module, e.g. sharedaddy
		 * @param string  $file   The path to the module source file.
		 */
		return apply_filters( 'jetpack_get_module', $mod, $module, $file );
	}

	/**
	 * Like core's get_file_data implementation, but caches the result.
	 */
	public static function get_file_data( $file, $headers ) {
		//Get just the filename from $file (i.e. exclude full path) so that a consistent hash is generated
		$file_name = basename( $file );
		$file_data_option = Jetpack_Options::get_option( 'file_data', array() );
		$key              = md5( $file_name . serialize( $headers ) );
		$refresh_cache    = is_admin() && isset( $_GET['page'] ) && 'jetpack' === substr( $_GET['page'], 0, 7 );

		// If we don't need to refresh the cache, and already have the value, short-circuit!
		if ( ! $refresh_cache && isset( $file_data_option[ JETPACK__VERSION ][ $key ] ) ) {
			return $file_data_option[ JETPACK__VERSION ][ $key ];
		}

		$data = get_file_data( $file, $headers );

		// Strip out any old Jetpack versions that are cluttering the option.
		$file_data_option = array_intersect_key( (array) $file_data_option, array( JETPACK__VERSION => null ) );
		$file_data_option[ JETPACK__VERSION ][ $key ] = $data;
		Jetpack_Options::update_option( 'file_data', $file_data_option );

		return $data;
	}

	public static function translate_module_tag( $untranslated_tag ) {
		// Tags are aggregated by tools/build-module-headings-translations.php
		// and output in modules/module-headings.php
		return _x( $untranslated_tag, 'Module Tag', 'jetpack' );
	}

	/**
	 * Get a list of activated modules as an array of module slugs.
	 */
	public static function get_active_modules() {
		$active = Jetpack_Options::get_option( 'active_modules' );
		if ( ! is_array( $active ) )
			$active = array();
		if ( is_admin() && ( class_exists( 'VaultPress' ) || function_exists( 'vaultpress_contact_service' ) ) ) {
			$active[] = 'vaultpress';
		} else {
			$active = array_diff( $active, array( 'vaultpress' ) );
		}

		//If protect is active on the main site of a multisite, it should be active on all sites.
		if ( ! in_array( 'protect', $active ) && is_multisite() && get_site_option( 'jetpack_protect_active' ) ) {
			$active[] = 'protect';
		}

		return array_unique( $active );
	}

	/**
	 * Check whether or not a Jetpack module is active.
	 *
	 * @param string $module The slug of a Jetpack module.
	 * @return bool
	 *
	 * @static
	 */
	public static function is_module_active( $module ) {
		return in_array( $module, self::get_active_modules() );
	}

	public static function is_module( $module ) {
		return ! empty( $module ) && ! validate_file( $module, Jetpack::get_available_modules() );
	}

	/**
	 * Catches PHP errors.  Must be used in conjunction with output buffering.
	 *
	 * @param bool $catch True to start catching, False to stop.
	 *
	 * @static
	 */
	public static function catch_errors( $catch ) {
		static $display_errors, $error_reporting;

		if ( $catch ) {
			$display_errors  = @ini_set( 'display_errors', 1 );
			$error_reporting = @error_reporting( E_ALL );
			add_action( 'shutdown', array( 'Jetpack', 'catch_errors_on_shutdown' ), 0 );
		} else {
			@ini_set( 'display_errors', $display_errors );

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

			@error_reporting( $error_reporting );

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

			remove_action( 'shutdown', array( 'Jetpack', 'catch_errors_on_shutdown' ), 0 );
		}
	}

	/**
	 * Saves any generated PHP errors in ::state( 'php_errors', {errors} )
	 */
	public static function catch_errors_on_shutdown() {
		Jetpack::state( 'php_errors', ob_get_clean() );
	}

	public static function activate_default_modules( $min_version = false, $max_version = false, $other_modules = array() ) {
		$jetpack = Jetpack::init();

		$modules = Jetpack::get_default_modules( $min_version, $max_version );
		$modules = array_merge( $other_modules, $modules );

		// Look for standalone plugins and disable if active.

		$to_deactivate = array();
		foreach ( $modules as $module ) {
			if ( isset( $jetpack->plugins_to_deactivate[$module] ) ) {
				$to_deactivate[$module] = $jetpack->plugins_to_deactivate[$module];
			}
		}

		$deactivated = array();
		foreach ( $to_deactivate as $module => $deactivate_me ) {
			list( $probable_file, $probable_title ) = $deactivate_me;
			if ( Jetpack_Client_Server::deactivate_plugin( $probable_file, $probable_title ) ) {
				$deactivated[] = $module;
			}
		}

		if ( $deactivated ) {

The expression $deactivated of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

			Jetpack::state( 'deactivated_plugins', join( ',', $deactivated ) );

			$url = add_query_arg(
				array(
					'action'   => 'activate_default_modules',
					'_wpnonce' => wp_create_nonce( 'activate_default_modules' ),
				),
				add_query_arg( compact( 'min_version', 'max_version', 'other_modules' ), Jetpack::admin_url( 'page=jetpack' ) )
			);
			wp_safe_redirect( $url );
			exit;

The method activate_default_modules() contains an exit expression.

		}

		/**
		 * Fires before default modules are activated.
		 *
		 * @since 1.9.0
		 *
		 * @param string $min_version Minimum version number required to use modules.
		 * @param string $max_version Maximum version number required to use modules.
		 * @param array $other_modules Array of other modules to activate alongside the default modules.
		 */
		do_action( 'jetpack_before_activate_default_modules', $min_version, $max_version, $other_modules );

		// Check each module for fatal errors, a la wp-admin/plugins.php::activate before activating
		Jetpack::restate();
		Jetpack::catch_errors( true );

		$active = Jetpack::get_active_modules();

		foreach ( $modules as $module ) {
			if ( did_action( "jetpack_module_loaded_$module" ) ) {
				$active[] = $module;
				Jetpack_Options::update_option( 'active_modules', array_unique( $active ) );
				continue;
			}

			if ( in_array( $module, $active ) ) {
				$module_info = Jetpack::get_module( $module );
				if ( ! $module_info['deactivate'] ) {
					$state = in_array( $module, $other_modules ) ? 'reactivated_modules' : 'activated_modules';
					if ( $active_state = Jetpack::state( $state ) ) {
						$active_state = explode( ',', $active_state );
					} else {
						$active_state = array();
					}
					$active_state[] = $module;
					Jetpack::state( $state, implode( ',', $active_state ) );
				}
				continue;
			}

			$file = Jetpack::get_module_path( $module );
			if ( ! file_exists( $file ) ) {
				continue;
			}

			// we'll override this later if the plugin can be included without fatal error
			wp_safe_redirect( Jetpack::admin_url( 'page=jetpack' ) );
			Jetpack::state( 'error', 'module_activation_failed' );
			Jetpack::state( 'module', $module );
			ob_start();
			require $file;
			/**
			 * Fires when a specific module is activated.
			 *
			 * @since 1.9.0
			 *
			 * @param string $module Module slug.
			 */
			do_action( 'jetpack_activate_module', $module );
			$active[] = $module;
			$state    = in_array( $module, $other_modules ) ? 'reactivated_modules' : 'activated_modules';
			if ( $active_state = Jetpack::state( $state ) ) {
				$active_state = explode( ',', $active_state );
			} else {
				$active_state = array();
			}
			$active_state[] = $module;
			Jetpack::state( $state, implode( ',', $active_state ) );
			Jetpack_Options::update_option( 'active_modules', array_unique( $active ) );
			ob_end_clean();
		}
		Jetpack::state( 'error', false );

false is of type boolean, but the function expects a string|null.

		Jetpack::state( 'module', false );

false is of type boolean, but the function expects a string|null.

		Jetpack::catch_errors( false );
		/**
		 * Fires when default modules are activated.
		 *
		 * @since 1.9.0
		 *
		 * @param string $min_version Minimum version number required to use modules.
		 * @param string $max_version Maximum version number required to use modules.
		 * @param array $other_modules Array of other modules to activate alongside the default modules.
		 */
		do_action( 'jetpack_activate_default_modules', $min_version, $max_version, $other_modules );
	}

	public static function activate_module( $module, $exit = true, $redirect = true ) {
		/**
		 * Fires before a module is activated.
		 *
		 * @since 2.6.0
		 *
		 * @param string $module Module slug.
		 * @param bool $exit Should we exit after the module has been activated. Default to true.
		 * @param bool $redirect Should the user be redirected after module activation? Default to true.
		 */
		do_action( 'jetpack_pre_activate_module', $module, $exit, $redirect );

		$jetpack = Jetpack::init();

		if ( ! strlen( $module ) )
			return false;

		if ( ! Jetpack::is_module( $module ) )
			return false;

		// If it's already active, then don't do it again
		$active = Jetpack::get_active_modules();
		foreach ( $active as $act ) {
			if ( $act == $module )
				return true;
		}

		$module_data = Jetpack::get_module( $module );

		if ( ! Jetpack::is_active() ) {
			if ( !Jetpack::is_development_mode() )
				return false;

			// If we're not connected but in development mode, make sure the module doesn't require a connection
			if ( Jetpack::is_development_mode() && $module_data['requires_connection'] )
				return false;
		}

		// Check and see if the old plugin is active
		if ( isset( $jetpack->plugins_to_deactivate[ $module ] ) ) {
			// Deactivate the old plugin
			if ( Jetpack_Client_Server::deactivate_plugin( $jetpack->plugins_to_deactivate[ $module ][0], $jetpack->plugins_to_deactivate[ $module ][1] ) ) {
				// If we deactivated the old plugin, remembere that with ::state() and redirect back to this page to activate the module
				// We can't activate the module on this page load since the newly deactivated old plugin is still loaded on this page load.
				Jetpack::state( 'deactivated_plugins', $module );
				wp_safe_redirect( add_query_arg( 'jetpack_restate', 1 ) );
				exit;

The method activate_module() contains an exit expression.

			}
		}

		// Check the file for fatal errors, a la wp-admin/plugins.php::activate
		Jetpack::state( 'module', $module );
		Jetpack::state( 'error', 'module_activation_failed' ); // we'll override this later if the plugin can be included without fatal error

		Jetpack::catch_errors( true );
		ob_start();
		require Jetpack::get_module_path( $module );
		/** This action is documented in class.jetpack.php */
		do_action( 'jetpack_activate_module', $module );
		$active[] = $module;
		Jetpack_Options::update_option( 'active_modules', array_unique( $active ) );
		Jetpack::state( 'error', false ); // the override

false is of type boolean, but the function expects a string|null.

		Jetpack::state( 'message', 'module_activated' );
		Jetpack::state( 'module', $module );
		ob_end_clean();
		Jetpack::catch_errors( false );

		// A flag for Jump Start so it's not shown again. Only set if it hasn't been yet.
		if ( 'new_connection' === Jetpack_Options::get_option( 'jumpstart' ) ) {
			Jetpack_Options::update_option( 'jumpstart', 'jetpack_action_taken' );

			//Jump start is being dismissed send data to MC Stats
			$jetpack->stat( 'jumpstart', 'manual,'.$module );

			$jetpack->do_stats( 'server_side' );
		}

		if ( $redirect ) {
			wp_safe_redirect( Jetpack::admin_url( 'page=jetpack' ) );
		}
		if ( $exit ) {
			exit;

The method activate_module() contains an exit expression.

		}
	}

	function activate_module_actions( $module ) {
		/**
		 * Fires when a module is activated.
		 * The dynamic part of the filter, $module, is the module slug.
		 *
		 * @since 1.9.0
		 *
		 * @param string $module Module slug.
		 */
		do_action( "jetpack_activate_module_$module", $module );

		$this->sync->sync_all_module_options( $module );
	}

	public static function deactivate_module( $module ) {
		/**
		 * Fires when a module is deactivated.
		 *
		 * @since 1.9.0
		 *
		 * @param string $module Module slug.
		 */
		do_action( 'jetpack_pre_deactivate_module', $module );

		$jetpack = Jetpack::init();

		$active = Jetpack::get_active_modules();
		$new    = array_filter( array_diff( $active, (array) $module ) );

		/**
		 * Fires when a module is deactivated.
		 * The dynamic part of the filter, $module, is the module slug.
		 *
		 * @since 1.9.0
		 *
		 * @param string $module Module slug.
		 */
		do_action( "jetpack_deactivate_module_$module", $module );

		// A flag for Jump Start so it's not shown again.
		if ( 'new_connection' === Jetpack_Options::get_option( 'jumpstart' ) ) {
			Jetpack_Options::update_option( 'jumpstart', 'jetpack_action_taken' );

			//Jump start is being dismissed send data to MC Stats
			$jetpack->stat( 'jumpstart', 'manual,deactivated-'.$module );

			$jetpack->do_stats( 'server_side' );
		}

		return Jetpack_Options::update_option( 'active_modules', array_unique( $new ) );
	}

	public static function enable_module_configurable( $module ) {
		$module = Jetpack::get_module_slug( $module );
		add_filter( 'jetpack_module_configurable_' . $module, '__return_true' );
	}

	public static function module_configuration_url( $module ) {
		$module = Jetpack::get_module_slug( $module );
		return Jetpack::admin_url( array( 'page' => 'jetpack', 'configure' => $module ) );
	}

	public static function module_configuration_load( $module, $method ) {
		$module = Jetpack::get_module_slug( $module );
		add_action( 'jetpack_module_configuration_load_' . $module, $method );
	}

	public static function module_configuration_head( $module, $method ) {
		$module = Jetpack::get_module_slug( $module );
		add_action( 'jetpack_module_configuration_head_' . $module, $method );
	}

	public static function module_configuration_screen( $module, $method ) {
		$module = Jetpack::get_module_slug( $module );
		add_action( 'jetpack_module_configuration_screen_' . $module, $method );
	}

	public static function module_configuration_activation_screen( $module, $method ) {
		$module = Jetpack::get_module_slug( $module );
		add_action( 'display_activate_module_setting_' . $module, $method );
	}

/* Installation */

	public static function bail_on_activation( $message, $deactivate = true ) {
?>
<!doctype html>
<html>
<head>
<meta charset="<?php bloginfo( 'charset' ); ?>">
<style>
* {
	text-align: center;
	margin: 0;
	padding: 0;
	font-family: "Lucida Grande",Verdana,Arial,"Bitstream Vera Sans",sans-serif;
}
p {
	margin-top: 1em;
	font-size: 18px;
}
</style>
<body>
<p><?php echo esc_html( $message ); ?></p>
</body>
</html>
<?php
		if ( $deactivate ) {
			$plugins = get_option( 'active_plugins' );
			$jetpack = plugin_basename( JETPACK__PLUGIN_DIR . 'jetpack.php' );
			$update  = false;
			foreach ( $plugins as $i => $plugin ) {
				if ( $plugin === $jetpack ) {
					$plugins[$i] = false;
					$update = true;
				}
			}

			if ( $update ) {
				update_option( 'active_plugins', array_filter( $plugins ) );
			}
		}
		exit;

The method bail_on_activation() contains an exit expression.

	}

	/**
	 * Attached to activate_{ plugin_basename( __FILES__ ) } by register_activation_hook()
	 * @static
	 */
	public static function plugin_activation( $network_wide ) {
		Jetpack_Options::update_option( 'activated', 1 );

		if ( version_compare( $GLOBALS['wp_version'], JETPACK__MINIMUM_WP_VERSION, '<' ) ) {
			Jetpack::bail_on_activation( sprintf( __( 'Jetpack requires WordPress version %s or later.', 'jetpack' ), JETPACK__MINIMUM_WP_VERSION ) );
		}

		if ( $network_wide )
			Jetpack::state( 'network_nag', true );

true is of type boolean, but the function expects a string|null.

		Jetpack::plugin_initialize();
	}
	/**
	 * Runs before bumping version numbers up to a new version
	 * @param  (string) $version    Version:timestamp
	 * @param  (string) $old_version Old Version:timestamp or false if not set yet.
	 * @return null              [description]
	 */
	public static function do_version_bump( $version, $old_version ) {

		if ( ! $old_version ) { // For new sites
			// Setting up jetpack manage
			Jetpack::activate_manage();
		}
	}

	/**
	 * Sets the internal version number and activation state.
	 * @static
	 */
	public static function plugin_initialize() {
		if ( ! Jetpack_Options::get_option( 'activated' ) ) {
			Jetpack_Options::update_option( 'activated', 2 );
		}

		if ( ! Jetpack_Options::get_option( 'version' ) ) {
			$version = $old_version = JETPACK__VERSION . ':' . time();
			/** This action is documented in class.jetpack.php */
			do_action( 'updating_jetpack_version', $version, false );
			Jetpack_Options::update_options( compact( 'version', 'old_version' ) );
		}

		Jetpack::load_modules();

		Jetpack_Options::delete_option( 'do_activate' );
	}

	/**
	 * Removes all connection options
	 * @static
	 */
	public static function plugin_deactivation( ) {
		require_once( ABSPATH . '/wp-admin/includes/plugin.php' );
		if( is_plugin_active_for_network( 'jetpack/jetpack.php' ) ) {
			Jetpack_Network::init()->deactivate();
		} else {
			Jetpack::disconnect( false );
			//Jetpack_Heartbeat::init()->deactivate();

70% of this comment could be valid code. Did you maybe forget this after debugging?

		}
	}

	/**
	 * Disconnects from the Jetpack servers.
	 * Forgets all connection details and tells the Jetpack servers to do the same.
	 * @static
	 */
	public static function disconnect( $update_activated_state = true ) {
		wp_clear_scheduled_hook( 'jetpack_clean_nonces' );
		Jetpack::clean_nonces( true );

		Jetpack::load_xml_rpc_client();
		$xml = new Jetpack_IXR_Client();
		$xml->query( 'jetpack.deregister' );

		Jetpack_Options::delete_option(
			array(
				'register',
				'blog_token',
				'user_token',
				'user_tokens',
				'master_user',
				'time_diff',
				'fallback_no_verify_ssl_certs',
			)
		);

		if ( $update_activated_state ) {
			Jetpack_Options::update_option( 'activated', 4 );
		}

		$jetpack_unique_connection = Jetpack_Options::get_option( 'unique_connection' );
		// Check then record unique disconnection if site has never been disconnected previously
		if ( -1 == $jetpack_unique_connection['disconnected'] ) {
			$jetpack_unique_connection['disconnected'] = 1;
		}
		else {
			if ( 0 == $jetpack_unique_connection['disconnected'] ) {
				//track unique disconnect
				$jetpack = Jetpack::init();

				$jetpack->stat( 'connections', 'unique-disconnect' );
				$jetpack->do_stats( 'server_side' );
			}
			// increment number of times disconnected
			$jetpack_unique_connection['disconnected'] += 1;
		}

		Jetpack_Options::update_option( 'unique_connection', $jetpack_unique_connection );

		// Disable the Heartbeat cron
		Jetpack_Heartbeat::init()->deactivate();
	}

	/**
	 * Unlinks the current user from the linked WordPress.com user
	 */
	public static function unlink_user( $user_id = null ) {
		if ( ! $tokens = Jetpack_Options::get_option( 'user_tokens' ) )
			return false;

		$user_id = empty( $user_id ) ? get_current_user_id() : intval( $user_id );

		if ( Jetpack_Options::get_option( 'master_user' ) == $user_id )
			return false;

		if ( ! isset( $tokens[ $user_id ] ) )
			return false;

		Jetpack::load_xml_rpc_client();
		$xml = new Jetpack_IXR_Client( compact( 'user_id' ) );
		$xml->query( 'jetpack.unlink_user', $user_id );

		unset( $tokens[ $user_id ] );

		Jetpack_Options::update_option( 'user_tokens', $tokens );

		return true;
	}

	/**
	 * Attempts Jetpack registration.  If it fail, a state flag is set: @see ::admin_page_load()
	 */
	public static function try_registration() {
		// Let's get some testing in beta versions and such.
		if ( self::is_development_version() && defined( 'PHP_URL_HOST' ) ) {
			// Before attempting to connect, let's make sure that the domains are viable.
			$domains_to_check = array_unique( array(
				'siteurl' => parse_url( get_site_url(), PHP_URL_HOST ),
				'homeurl' => parse_url( get_home_url(), PHP_URL_HOST ),
			) );
			foreach ( $domains_to_check as $domain ) {
				$result = Jetpack_Data::is_usable_domain( $domain );
				if ( is_wp_error( $result ) ) {
					return $result;
				}
			}
		}

		$result = Jetpack::register();

		// If there was an error with registration and the site was not registered, record this so we can show a message.
		if ( ! $result || is_wp_error( $result ) ) {
			return $result;
		} else {
			return true;
		}
	}

	/**
	 * Tracking an internal event log. Try not to put too much chaff in here.
	 *
	 * [Everyone Loves a Log!](https://www.youtube.com/watch?v=2C7mNr5WMjA)
	 */
	public static function log( $code, $data = null ) {
		// only grab the latest 200 entries
		$log = array_slice( Jetpack_Options::get_option( 'log', array() ), -199, 199 );

		// Append our event to the log
		$log_entry = array(
			'time'    => time(),
			'user_id' => get_current_user_id(),
			'blog_id' => Jetpack_Options::get_option( 'id' ),
			'code'    => $code,
		);
		// Don't bother storing it unless we've got some.
		if ( ! is_null( $data ) ) {
			$log_entry['data'] = $data;
		}
		$log[] = $log_entry;

		// Try add_option first, to make sure it's not autoloaded.
		// @todo: Add an add_option method to Jetpack_Options

Comments for TODO tasks are often forgotten in the code; it might be better to use a dedicated issue tracker.

		if ( ! add_option( 'jetpack_log', $log, null, 'no' ) ) {
			Jetpack_Options::update_option( 'log', $log );
		}

		/**
		 * Fires when Jetpack logs an internal event.
		 *
		 * @since 3.0.0
		 *
		 * @param array $log_entry {
		 *	Array of details about the log entry.
		 *
		 *	@param string time Time of the event.
		 *	@param int user_id ID of the user who trigerred the event.
		 *	@param int blog_id Jetpack Blog ID.
		 *	@param string code Unique name for the event.
		 *	@param string data Data about the event.
		 * }
		 */
		do_action( 'jetpack_log_entry', $log_entry );
	}

	/**
	 * Get the internal event log.
	 *
	 * @param $event (string) - only return the specific log events
	 * @param $num   (int)    - get specific number of latest results, limited to 200
	 *
	 * @return array of log events || WP_Error for invalid params
	 */
	public static function get_log( $event = false, $num = false ) {
		if ( $event && ! is_string( $event ) ) {
			return new WP_Error( __( 'First param must be string or empty', 'jetpack' ) );
		}

		if ( $num && ! is_numeric( $num ) ) {
			return new WP_Error( __( 'Second param must be numeric or empty', 'jetpack' ) );
		}

		$entire_log = Jetpack_Options::get_option( 'log', array() );

		// If nothing set - act as it did before, otherwise let's start customizing the output
		if ( ! $num && ! $event ) {
			return $entire_log;
		} else {
			$entire_log = array_reverse( $entire_log );
		}

		$custom_log_output = array();

		if ( $event ) {
			foreach ( $entire_log as $log_event ) {
				if ( $event == $log_event[ 'code' ] ) {
					$custom_log_output[] = $log_event;
				}
			}
		} else {
			$custom_log_output = $entire_log;
		}

		if ( $num ) {
			$custom_log_output = array_slice( $custom_log_output, 0, $num );
		}

		return $custom_log_output;
	}

	/**
	 * Log modification of important settings.
	 */
	public static function log_settings_change( $option, $old_value, $value ) {
		switch( $option ) {
			case 'jetpack_sync_non_public_post_stati':
				self::log( $option, $value );
				break;
		}
	}

	/**
	 * Return stat data for WPCOM sync
	 */
	function get_stat_data() {
		$heartbeat_data = Jetpack_Heartbeat::generate_stats_array();
		$additional_data = $this->get_additional_stat_data();

		return json_encode( array_merge( $heartbeat_data, $additional_data ) );
	}

	/**
	 * Get additional stat data to sync to WPCOM
	 */
	function get_additional_stat_data( $prefix = '' ) {
		$return["{$prefix}themes"]         = Jetpack::get_parsed_theme_data();

$return was never initialized. Although not strictly required by PHP, it is generally a good practice to add $return = array(); before regardless.

		$return["{$prefix}plugins-extra"]  = Jetpack::get_parsed_plugin_data();
		$return["{$prefix}users"]          = count_users();
		$return["{$prefix}site-count"]     = 0;
		if ( function_exists( 'get_blog_count' ) ) {
			$return["{$prefix}site-count"] = get_blog_count();
		}
		return $return;
	}

	/* Admin Pages */

	function admin_init() {
		// If the plugin is not connected, display a connect message.
		if (
			// the plugin was auto-activated and needs its candy
			Jetpack_Options::get_option( 'do_activate' )
		||
			// the plugin is active, but was never activated.  Probably came from a site-wide network activation
			! Jetpack_Options::get_option( 'activated' )
		) {
			Jetpack::plugin_initialize();
		}

		if ( ! Jetpack::is_active() && ! Jetpack::is_development_mode() ) {
			if ( 4 != Jetpack_Options::get_option( 'activated' ) ) {
				// Show connect notice on dashboard and plugins pages
				add_action( 'load-index.php', array( $this, 'prepare_connect_notice' ) );
				add_action( 'load-plugins.php', array( $this, 'prepare_connect_notice' ) );
			}
		} elseif ( false === Jetpack_Options::get_option( 'fallback_no_verify_ssl_certs' ) ) {
			// Upgrade: 1.1 -> 1.1.1

56% of this comment could be valid code. Did you maybe forget this after debugging?

			// Check and see if host can verify the Jetpack servers' SSL certificate
			$args = array();
			Jetpack_Client::_wp_remote_request(
				Jetpack::fix_url_for_bad_hosts( Jetpack::api_url( 'test' ) ),
				$args,
				true
			);
		} else {
			// Show the notice on the Dashboard only for now

			add_action( 'load-index.php', array( $this, 'prepare_manage_jetpack_notice' ) );

			// Identity crisis notices
			add_action( 'jetpack_notices', array( $this, 'alert_identity_crisis' ) );
		}

		// If the plugin has just been disconnected from WP.com, show the survey notice
		if ( isset( $_GET['disconnected'] ) && 'true' === $_GET['disconnected'] ) {
			add_action( 'jetpack_notices', array( $this, 'disconnect_survey_notice' ) );
		}

		if ( current_user_can( 'manage_options' ) && 'ALWAYS' == JETPACK_CLIENT__HTTPS && ! self::permit_ssl() ) {
			add_action( 'admin_notices', array( $this, 'alert_required_ssl_fail' ) );
		}

		add_action( 'load-plugins.php', array( $this, 'intercept_plugin_error_scrape_init' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'admin_menu_css' ) );
		add_filter( 'plugin_action_links_' . plugin_basename( JETPACK__PLUGIN_DIR . 'jetpack.php' ), array( $this, 'plugin_action_links' ) );

		if ( Jetpack::is_active() || Jetpack::is_development_mode() ) {
			// Artificially throw errors in certain whitelisted cases during plugin activation
			add_action( 'activate_plugin', array( $this, 'throw_error_on_activate_plugin' ) );

			// Kick off synchronization of user role when it changes
			add_action( 'set_user_role', array( $this, 'user_role_change' ) );
		}

		// Jetpack Manage Activation Screen from .com
		Jetpack::module_configuration_activation_screen( 'manage', array( $this, 'manage_activate_screen' ) );
	}

	function admin_body_class( $admin_body_class = '' ) {
		$classes = explode( ' ', trim( $admin_body_class ) );

		$classes[] = self::is_active() ? 'jetpack-connected' : 'jetpack-disconnected';

		$admin_body_class = implode( ' ', array_unique( $classes ) );
		return " $admin_body_class ";
	}

	static function add_jetpack_pagestyles( $admin_body_class = '' ) {
		return $admin_body_class . ' jetpack-pagestyles ';
	}

	function prepare_connect_notice() {
		add_action( 'admin_print_styles', array( $this, 'admin_banner_styles' ) );

		add_action( 'admin_notices', array( $this, 'admin_connect_notice' ) );

		if ( Jetpack::state( 'network_nag' ) )
			add_action( 'network_admin_notices', array( $this, 'network_connect_notice' ) );
	}
	/**
	 * Call this function if you want the Big Jetpack Manage Notice to show up.
	 *
	 * @return null
	 */
	function prepare_manage_jetpack_notice() {

		add_action( 'admin_print_styles', array( $this, 'admin_banner_styles' ) );
		add_action( 'admin_notices', array( $this, 'admin_jetpack_manage_notice' ) );
	}

	function manage_activate_screen() {
		include ( JETPACK__PLUGIN_DIR . 'modules/manage/activate-admin.php' );
	}
	/**
	 * Sometimes a plugin can activate without causing errors, but it will cause errors on the next page load.
	 * This function artificially throws errors for such cases (whitelisted).
	 *
	 * @param string $plugin The activated plugin.
	 */
	function throw_error_on_activate_plugin( $plugin ) {
		$active_modules = Jetpack::get_active_modules();

		// The Shortlinks module and the Stats plugin conflict, but won't cause errors on activation because of some function_exists() checks.
		if ( function_exists( 'stats_get_api_key' ) && in_array( 'shortlinks', $active_modules ) ) {
			$throw = false;

			// Try and make sure it really was the stats plugin
			if ( ! class_exists( 'ReflectionFunction' ) ) {
				if ( 'stats.php' == basename( $plugin ) ) {
					$throw = true;
				}
			} else {
				$reflection = new ReflectionFunction( 'stats_get_api_key' );
				if ( basename( $plugin ) == basename( $reflection->getFileName() ) ) {
					$throw = true;
				}
			}

			if ( $throw ) {
				trigger_error( sprintf( __( 'Jetpack contains the most recent version of the old “%1$s” plugin.', 'jetpack' ), 'WordPress.com Stats' ), E_USER_ERROR );
			}
		}
	}

	function intercept_plugin_error_scrape_init() {
		add_action( 'check_admin_referer', array( $this, 'intercept_plugin_error_scrape' ), 10, 2 );
	}

	function intercept_plugin_error_scrape( $action, $result ) {
		if ( ! $result ) {
			return;
		}

		foreach ( $this->plugins_to_deactivate as $deactivate_me ) {
			if ( "plugin-activation-error_{$deactivate_me[0]}" == $action ) {
				Jetpack::bail_on_activation( sprintf( __( 'Jetpack contains the most recent version of the old “%1$s” plugin.', 'jetpack' ), $deactivate_me[1] ), false );
			}
		}
	}

	function add_remote_request_handlers() {
		add_action( 'wp_ajax_nopriv_jetpack_upload_file', array( $this, 'remote_request_handlers' ) );
	}

	function remote_request_handlers() {
		switch ( current_filter() ) {
		case 'wp_ajax_nopriv_jetpack_upload_file' :
			$response = $this->upload_handler();
			break;
		default :

There must be no space before the colon in a DEFAULT statement

			$response = new Jetpack_Error( 'unknown_handler', 'Unknown Handler', 400 );
			break;
		}

		if ( ! $response ) {
			$response = new Jetpack_Error( 'unknown_error', 'Unknown Error', 400 );
		}

		if ( is_wp_error( $response ) ) {
			$status_code       = $response->get_error_data();
			$error             = $response->get_error_code();
			$error_description = $response->get_error_message();

			if ( ! is_int( $status_code ) ) {
				$status_code = 400;
			}

			status_header( $status_code );
			die( json_encode( (object) compact( 'error', 'error_description' ) ) );

The method remote_request_handlers() contains an exit expression.

		}

		status_header( 200 );
		if ( true === $response ) {
			exit;

The method remote_request_handlers() contains an exit expression.

		}

		die( json_encode( (object) $response ) );

The method remote_request_handlers() contains an exit expression.

	}

	function upload_handler() {
		if ( 'POST' !== strtoupper( $_SERVER['REQUEST_METHOD'] ) ) {
			return new Jetpack_Error( 405, get_status_header_desc( 405 ), 405 );
		}

		$user = wp_authenticate( '', '' );
		if ( ! $user || is_wp_error( $user ) ) {
			return new Jetpack_Error( 403, get_status_header_desc( 403 ), 403 );
		}

		wp_set_current_user( $user->ID );

		if ( ! current_user_can( 'upload_files' ) ) {
			return new Jetpack_Error( 'cannot_upload_files', 'User does not have permission to upload files', 403 );
		}

		if ( empty( $_FILES ) ) {
			return new Jetpack_Error( 'no_files_uploaded', 'No files were uploaded: nothing to process', 400 );
		}

		foreach ( array_keys( $_FILES ) as $files_key ) {
			if ( ! isset( $_POST["_jetpack_file_hmac_{$files_key}"] ) ) {
				return new Jetpack_Error( 'missing_hmac', 'An HMAC for one or more files is missing', 400 );
			}
		}

		$media_keys = array_keys( $_FILES['media'] );

		$token = Jetpack_Data::get_access_token( get_current_user_id() );
		if ( ! $token || is_wp_error( $token ) ) {
			return new Jetpack_Error( 'unknown_token', 'Unknown Jetpack token', 403 );
		}

		$uploaded_files = array();
		$global_post    = isset( $GLOBALS['post'] ) ? $GLOBALS['post'] : null;
		unset( $GLOBALS['post'] );
		foreach ( $_FILES['media']['name'] as $index => $name ) {
			$file = array();
			foreach ( $media_keys as $media_key ) {
				$file[$media_key] = $_FILES['media'][$media_key][$index];
			}

			list( $hmac_provided, $salt ) = explode( ':', $_POST['_jetpack_file_hmac_media'][$index] );

			$hmac_file = hash_hmac_file( 'sha1', $file['tmp_name'], $salt . $token->secret );
			if ( $hmac_provided !== $hmac_file ) {
				$uploaded_files[$index] = (object) array( 'error' => 'invalid_hmac', 'error_description' => 'The corresponding HMAC for this file does not match' );
				continue;
			}

			$_FILES['.jetpack.upload.'] = $file;
			$post_id = isset( $_POST['post_id'][$index] ) ? absint( $_POST['post_id'][$index] ) : 0;
			if ( ! current_user_can( 'edit_post', $post_id ) ) {
				$post_id = 0;
			}
			$attachment_id = media_handle_upload(
				'.jetpack.upload.',
				$post_id,
				array(),
				array(
					'action' => 'jetpack_upload_file',
				)
			);

			if ( ! $attachment_id ) {
				$uploaded_files[$index] = (object) array( 'error' => 'unknown', 'error_description' => 'An unknown problem occurred processing the upload on the Jetpack site' );
			} elseif ( is_wp_error( $attachment_id ) ) {
				$uploaded_files[$index] = (object) array( 'error' => 'attachment_' . $attachment_id->get_error_code(), 'error_description' => $attachment_id->get_error_message() );
			} else {
				$attachment = get_post( $attachment_id );
				$uploaded_files[$index] = (object) array(
					'id'   => (string) $attachment_id,
					'file' => $attachment->post_title,
					'url'  => wp_get_attachment_url( $attachment_id ),
					'type' => $attachment->post_mime_type,
					'meta' => wp_get_attachment_metadata( $attachment_id ),
				);
			}
		}
		if ( ! is_null( $global_post ) ) {
			$GLOBALS['post'] = $global_post;
		}

		return $uploaded_files;
	}

	/**
	 * Add help to the Jetpack page
	 *
	 * @since Jetpack (1.2.3)
	 * @return false if not the Jetpack page
	 */
	function admin_help() {
		$current_screen = get_current_screen();

		// Overview
		$current_screen->add_help_tab(
			array(
				'id'		=> 'home',
				'title'		=> __( 'Home', 'jetpack' ),
				'content'	=>
					'<p><strong>' . __( 'Jetpack by WordPress.com', 'jetpack' ) . '</strong></p>' .
					'<p>' . __( 'Jetpack supercharges your self-hosted WordPress site with the awesome cloud power of WordPress.com.', 'jetpack' ) . '</p>' .
					'<p>' . __( 'On this page, you are able to view the modules available within Jetpack, learn more about them, and activate or deactivate them as needed.', 'jetpack' ) . '</p>',
			)
		);

		// Screen Content
		if ( current_user_can( 'manage_options' ) ) {
			$current_screen->add_help_tab(
				array(
					'id'		=> 'settings',
					'title'		=> __( 'Settings', 'jetpack' ),
					'content'	=>
						'<p><strong>' . __( 'Jetpack by WordPress.com',                                              'jetpack' ) . '</strong></p>' .
						'<p>' . __( 'You can activate or deactivate individual Jetpack modules to suit your needs.', 'jetpack' ) . '</p>' .
						'<ol>' .
							'<li>' . __( 'Each module has an Activate or Deactivate link so you can toggle one individually.',														'jetpack' ) . '</li>' .
							'<li>' . __( 'Using the checkboxes next to each module, you can select multiple modules to toggle via the Bulk Actions menu at the top of the list.',	'jetpack' ) . '</li>' .
						'</ol>' .
						'<p>' . __( 'Using the tools on the right, you can search for specific modules, filter by module categories or which are active, or change the sorting order.', 'jetpack' ) . '</p>'
				)
			);
		}

		// Help Sidebar
		$current_screen->set_help_sidebar(
			'<p><strong>' . __( 'For more information:', 'jetpack' ) . '</strong></p>' .
			'<p><a href="http://jetpack.me/faq/" target="_blank">'     . __( 'Jetpack FAQ',     'jetpack' ) . '</a></p>' .
			'<p><a href="http://jetpack.me/support/" target="_blank">' . __( 'Jetpack Support', 'jetpack' ) . '</a></p>' .
			'<p><a href="' . Jetpack::admin_url( array( 'page' => 'jetpack-debugger' )  ) .'">' . __( 'Jetpack Debugging Center', 'jetpack' ) . '</a></p>'
		);
	}

	function admin_menu_css() {
		wp_enqueue_style( 'jetpack-icons' );
	}

	function admin_menu_order() {
		return true;
	}

	function jetpack_menu_order( $menu_order ) {
		$jp_menu_order = array();

		foreach ( $menu_order as $index => $item ) {
			if ( $item != 'jetpack' ) {
				$jp_menu_order[] = $item;
			}

			if ( $index == 0 ) {
				$jp_menu_order[] = 'jetpack';
			}
		}

		return $jp_menu_order;
	}

	function admin_head() {
		if ( isset( $_GET['configure'] ) && Jetpack::is_module( $_GET['configure'] ) && current_user_can( 'manage_options' ) )
			/** This action is documented in class.jetpack-admin-page.php */
			do_action( 'jetpack_module_configuration_head_' . $_GET['configure'] );
	}

	function admin_banner_styles() {
		$min = ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) ? '' : '.min';

		wp_enqueue_style( 'jetpack', plugins_url( "css/jetpack-banners{$min}.css", JETPACK__PLUGIN_FILE ), false, JETPACK__VERSION . '-20121016' );
		wp_style_add_data( 'jetpack', 'rtl', 'replace' );
		wp_style_add_data( 'jetpack', 'suffix', $min );
	}

	function admin_scripts() {
		wp_enqueue_script( 'jetpack-js', plugins_url( '_inc/jp.js', JETPACK__PLUGIN_FILE ), array( 'jquery', 'wp-util' ), JETPACK__VERSION . '-20121111' );
		wp_localize_script(
			'jetpack-js',
			'jetpackL10n',
			array(
				'ays_disconnect' => "This will deactivate all Jetpack modules.\nAre you sure you want to disconnect?",
				'ays_unlink'     => "This will prevent user-specific modules such as Publicize, Notifications and Post By Email from working.\nAre you sure you want to unlink?",
				'ays_dismiss'    => "This will deactivate Jetpack.\nAre you sure you want to deactivate Jetpack?",
			)
		);
		add_action( 'admin_footer', array( $this, 'do_stats' ) );
	}

	function plugin_action_links( $actions ) {

		$jetpack_home = array( 'jetpack-home' => sprintf( '<a href="%s">%s</a>', Jetpack::admin_url( 'page=jetpack' ), __( 'Jetpack', 'jetpack' ) ) );

		if( current_user_can( 'jetpack_manage_modules' ) && ( Jetpack::is_active() || Jetpack::is_development_mode() ) ) {
			return array_merge(
				$jetpack_home,
				array( 'settings' => sprintf( '<a href="%s">%s</a>', Jetpack::admin_url( 'page=jetpack_modules' ), __( 'Settings', 'jetpack' ) ) ),
				array( 'support' => sprintf( '<a href="%s">%s</a>', Jetpack::admin_url( 'page=jetpack-debugger '), __( 'Support', 'jetpack' ) ) ),
				$actions
				);
			}

		return array_merge( $jetpack_home, $actions );
	}

	function admin_connect_notice() {
		// Don't show the connect notice anywhere but the plugins.php after activating
		$current = get_current_screen();
		if ( 'plugins' !== $current->parent_base )
			return;

		if ( ! current_user_can( 'jetpack_connect' ) )
			return;

		$dismiss_and_deactivate_url = wp_nonce_url( Jetpack::admin_url( '?page=jetpack&jetpack-notice=dismiss' ), 'jetpack-deactivate' );
		?>
		<div id="message" class="updated jetpack-message jp-banner" style="display:block !important;">
			<a class="jp-banner__dismiss" href="<?php echo esc_url( $dismiss_and_deactivate_url ); ?>" title="<?php esc_attr_e( 'Dismiss this notice and deactivate Jetpack.', 'jetpack' ); ?>"></a>
			<?php if ( in_array( Jetpack_Options::get_option( 'activated' ) , array( 1, 2, 3 ) ) ) : ?>
				<div class="jp-banner__content is-connection">
					<h2><?php _e( 'Your Jetpack is almost ready!', 'jetpack' ); ?></h2>
					<p><?php _e( 'Connect now to enable features like Stats, Likes, and Social Sharing.', 'jetpack' ); ?></p>
				</div>
				<div class="jp-banner__action-container is-connection">
						<a href="<?php echo $this->build_connect_url() ?>" class="jp-banner__button" id="wpcom-connect"><?php _e( 'Connect to WordPress.com', 'jetpack' ); ?></a>
				</div>
			<?php else : ?>
				<div class="jp-banner__content">
					<h2><?php _e( 'Jetpack is installed!', 'jetpack' ) ?></h2>
					<p><?php _e( 'It\'s ready to bring awesome, WordPress.com cloud-powered features to your site.', 'jetpack' ) ?></p>
				</div>
				<div class="jp-banner__action-container">
					<a href="<?php echo Jetpack::admin_url() ?>" class="jp-banner__button" id="wpcom-connect"><?php _e( 'Learn More', 'jetpack' ); ?></a>
				</div>
			<?php endif; ?>
		</div>

		<?php
	}

	/**
	 * This is the first banner
	 * It should be visible only to user that can update the option
	 * Are not connected
	 *
	 * @return null
	 */
	function admin_jetpack_manage_notice() {
		$screen = get_current_screen();

		// Don't show the connect notice on the jetpack settings page.
		if ( ! in_array( $screen->base, array( 'dashboard' ) ) || $screen->is_network || $screen->action )
			return;

		// Only show it if don't have the managment option set.
		// And not dismissed it already.
		if ( ! $this->can_display_jetpack_manage_notice() || Jetpack_Options::get_option( 'dismissed_manage_banner' ) ) {
			return;
		}

		$opt_out_url = $this->opt_out_jetpack_manage_url();
		$opt_in_url  = $this->opt_in_jetpack_manage_url();
		/**
		 * I think it would be great to have different wordsing depending on where you are
		 * for example if we show the notice on dashboard and a different one if we show it on Plugins screen
		 * etc..
		 */

		?>
		<div id="message" class="updated jetpack-message jp-banner is-opt-in" style="display:block !important;">
			<a class="jp-banner__dismiss" href="<?php echo esc_url( $opt_out_url ); ?>" title="<?php esc_attr_e( 'Dismiss this notice for now.', 'jetpack' ); ?>"></a>
			<div class="jp-banner__content">
				<h2><?php esc_html_e( 'New in Jetpack: Centralized Site Management', 'jetpack' ); ?></h2>
				<p><?php printf( __( 'Manage multiple sites from one dashboard at wordpress.com/sites. Enabling allows all existing, connected Administrators to modify your site from WordPress.com. <a href="%s" target="_blank">Learn More</a>.', 'jetpack' ), 'http://jetpack.me/support/site-management' ); ?></p>
			</div>
			<div class="jp-banner__action-container is-opt-in">
				<a href="<?php echo esc_url( $opt_in_url ); ?>" class="jp-banner__button" id="wpcom-connect"><?php _e( 'Activate now', 'jetpack' ); ?></a>
			</div>
		</div>
		<?php
	}

	/**
	 * Returns the url that the user clicks to remove the notice for the big banner
	 * @return (string)
	 */
	function opt_out_jetpack_manage_url() {
		$referer = '&_wp_http_referer=' . add_query_arg( '_wp_http_referer', null );
		return wp_nonce_url( Jetpack::admin_url( 'jetpack-notice=jetpack-manage-opt-out' . $referer ), 'jetpack_manage_banner_opt_out' );
	}
	/**
	 * Returns the url that the user clicks to opt in to Jetpack Manage
	 * @return (string)
	 */
	function opt_in_jetpack_manage_url() {
		return wp_nonce_url( Jetpack::admin_url( 'jetpack-notice=jetpack-manage-opt-in' ), 'jetpack_manage_banner_opt_in' );
	}

	function opt_in_jetpack_manage_notice() {
		?>
		<div class="wrap">
			<div id="message" class="jetpack-message is-opt-in">
				<?php echo sprintf( __( '<p><a href="%1$s" title="Opt in to WordPress.com Site Management" >Activate Site Management</a> to manage multiple sites from our centralized dashboard at wordpress.com/sites. <a href="%2$s" target="_blank">Learn more</a>.</p><a href="%1$s" class="jp-button">Activate Now</a>', 'jetpack' ), $this->opt_in_jetpack_manage_url(), 'http://jetpack.me/support/site-management' ); ?>
			</div>
		</div>
		<?php

	}
	/**
	 * Determines whether to show the notice of not true = display notice
	 * @return (bool)
	 */
	function can_display_jetpack_manage_notice() {
		// never display the notice to users that can't do anything about it anyways
		if( ! current_user_can( 'jetpack_manage_modules' ) )
			return false;

		// don't display if we are in development more
		if( Jetpack::is_development_mode() ) {
			return false;
		}
		// don't display if the site is private
		if(  ! Jetpack_Options::get_option( 'public' ) )
			return false;

		/**
		 * Should the Jetpack Remote Site Management notice be displayed.
		 *
		 * @since 3.3.0
		 *
		 * @param bool ! self::is_module_active( 'manage' ) Is the Manage module inactive.
		 */
		return apply_filters( 'can_display_jetpack_manage_notice', ! self::is_module_active( 'manage' ) );
	}

	function network_connect_notice() {
		?>
		<div id="message" class="updated jetpack-message">
			<div class="squeezer">
				<h2><?php _e( '<strong>Jetpack is activated!</strong> Each site on your network must be connected individually by an admin on that site.', 'jetpack' ) ?></h2>
			</div>
		</div>
		<?php
	}

	public static function jetpack_comment_notice() {
		if ( in_array( 'comments', Jetpack::get_active_modules() ) ) {
			return '';
		}

		$jetpack_old_version = explode( ':', Jetpack_Options::get_option( 'old_version' ) );
		$jetpack_new_version = explode( ':', Jetpack_Options::get_option( 'version' ) );

		if ( $jetpack_old_version ) {

The expression $jetpack_old_version of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

			if ( version_compare( $jetpack_old_version[0], '1.4', '>=' ) ) {
				return '';
			}
		}

		if ( $jetpack_new_version ) {

The expression $jetpack_new_version of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

			if ( version_compare( $jetpack_new_version[0], '1.4-something', '<' ) ) {
				return '';
			}
		}

		return '<br /><br />' . sprintf(
			__( 'Jetpack now includes Comments, which enables your visitors to use their WordPress.com, Twitter, or Facebook accounts when commenting on your site. To activate Comments, <a href="%s">%s</a>.', 'jetpack' ),
			wp_nonce_url(
				Jetpack::admin_url(
					array(
						'page'   => 'jetpack',
						'action' => 'activate',
						'module' => 'comments',
					)
				),
				'jetpack_activate-comments'
			),
			__( 'click here', 'jetpack' )
		);
	}

	/**
	 * Show the survey link when the user has just disconnected Jetpack.
	 */
	function disconnect_survey_notice() {
		?>
		<div class="wrap">
			<div id="message" class="jetpack-message stay-visible">
				<div class="squeezer">
					<h2>
						<?php _e( 'You have successfully disconnected Jetpack.', 'jetpack' ); ?>
						<br />
						<?php echo sprintf(
							__( 'Would you tell us why? Just <a href="%1$s" target="%2$s">answering two simple questions</a> would help us improve Jetpack.', 'jetpack' ),
							'https://jetpack.me/survey-disconnected/',
							'_blank'
						); ?>
					</h2>
				</div>
			</div>
		</div>
		<?php
	}

	/*
	 * Registration flow:
	 * 1 - ::admin_page_load() action=register
	 * 2 - ::try_registration()
	 * 3 - ::register()
	 *     - Creates jetpack_register option containing two secrets and a timestamp
	 *     - Calls https://jetpack.wordpress.com/jetpack.register/1/ with
	 *       siteurl, home, gmt_offset, timezone_string, site_name, secret_1, secret_2, site_lang, timeout, stats_id
	 *     - That request to jetpack.wordpress.com does not immediately respond.  It first makes a request BACK to this site's
	 *       xmlrpc.php?for=jetpack: RPC method: jetpack.verifyRegistration, Parameters: secret_1
	 *     - The XML-RPC request verifies secret_1, deletes both secrets and responds with: secret_2
	 *     - https://jetpack.wordpress.com/jetpack.register/1/ verifies that XML-RPC response (secret_2) then finally responds itself with
	 *       jetpack_id, jetpack_secret, jetpack_public
	 *     - ::register() then stores jetpack_options: id => jetpack_id, blog_token => jetpack_secret
	 * 4 - redirect to https://jetpack.wordpress.com/jetpack.authorize/1/
	 * 5 - user logs in with WP.com account
	 * 6 - redirect to this site's wp-admin/index.php?page=jetpack&action=authorize with
	 *     code <-- OAuth2 style authorization code
	 * 7 - ::admin_page_load() action=authorize
	 * 8 - Jetpack_Client_Server::authorize()
	 * 9 - Jetpack_Client_Server::get_token()
	 * 10- GET https://jetpack.wordpress.com/jetpack.token/1/ with
	 *     client_id, client_secret, grant_type, code, redirect_uri:action=authorize, state, scope, user_email, user_login
	 * 11- which responds with
	 *     access_token, token_type, scope
	 * 12- Jetpack_Client_Server::authorize() stores jetpack_options: user_token => access_token.$user_id
	 * 13- Jetpack::activate_default_modules()
	 *     Deactivates deprecated plugins
	 *     Activates all default modules
	 *     Catches errors: redirects to wp-admin/index.php?page=jetpack state:error=something
	 * 14- redirect to this site's wp-admin/index.php?page=jetpack with state:message=authorized
	 *     Done!
	 */

	/**
	 * Handles the page load events for the Jetpack admin page
	 */
	function admin_page_load() {
		$error = false;

		// Make sure we have the right body class to hook stylings for subpages off of.
		add_filter( 'admin_body_class', array( __CLASS__, 'add_jetpack_pagestyles' ) );

		if ( ! empty( $_GET['jetpack_restate'] ) ) {
			// Should only be used in intermediate redirects to preserve state across redirects
			Jetpack::restate();
		}

		if ( isset( $_GET['connect_url_redirect'] ) ) {
			// User clicked in the iframe to link their accounts
			if ( ! Jetpack::is_user_connected() ) {
				$connect_url = $this->build_connect_url( true );
				if ( isset( $_GET['notes_iframe'] ) )
					$connect_url .= '&notes_iframe';
				wp_redirect( $connect_url );
				exit;

The method admin_page_load() contains an exit expression.

			} else {
				Jetpack::state( 'message', 'already_authorized' );
				wp_safe_redirect( Jetpack::admin_url() );
				exit;

The method admin_page_load() contains an exit expression.

			}
		}


		if ( isset( $_GET['action'] ) ) {
			switch ( $_GET['action'] ) {
			case 'authorize' :
				if ( Jetpack::is_active() && Jetpack::is_user_connected() ) {
					Jetpack::state( 'message', 'already_authorized' );
					wp_safe_redirect( Jetpack::admin_url() );
					exit;

The method admin_page_load() contains an exit expression.

				}
				Jetpack::log( 'authorize' );
				$client_server = new Jetpack_Client_Server;
				$client_server->authorize();
				exit;

The method admin_page_load() contains an exit expression.

			case 'register' :
				if ( ! current_user_can( 'jetpack_connect' ) ) {
					$error = 'cheatin';
					break;
				}
				check_admin_referer( 'jetpack-register' );
				Jetpack::log( 'register' );
				Jetpack::maybe_set_version_option();
				$registered = Jetpack::try_registration();
				if ( is_wp_error( $registered ) ) {
					$error = $registered->get_error_code();
					Jetpack::state( 'error_description', $registered->get_error_message() );
					break;
				}

				wp_redirect( $this->build_connect_url( true ) );
				exit;

The method admin_page_load() contains an exit expression.

			case 'activate' :
				if ( ! current_user_can( 'jetpack_activate_modules' ) ) {
					$error = 'cheatin';
					break;
				}

				$module = stripslashes( $_GET['module'] );
				check_admin_referer( "jetpack_activate-$module" );
				Jetpack::log( 'activate', $module );
				Jetpack::activate_module( $module );
				// The following two lines will rarely happen, as Jetpack::activate_module normally exits at the end.
				wp_safe_redirect( Jetpack::admin_url( 'page=jetpack' ) );
				exit;

The method admin_page_load() contains an exit expression.

			case 'activate_default_modules' :
				check_admin_referer( 'activate_default_modules' );
				Jetpack::log( 'activate_default_modules' );
				Jetpack::restate();
				$min_version   = isset( $_GET['min_version'] ) ? $_GET['min_version'] : false;
				$max_version   = isset( $_GET['max_version'] ) ? $_GET['max_version'] : false;
				$other_modules = isset( $_GET['other_modules'] ) && is_array( $_GET['other_modules'] ) ? $_GET['other_modules'] : array();
				Jetpack::activate_default_modules( $min_version, $max_version, $other_modules );
				wp_safe_redirect( Jetpack::admin_url( 'page=jetpack' ) );
				exit;

The method admin_page_load() contains an exit expression.

			case 'disconnect' :
				if ( ! current_user_can( 'jetpack_disconnect' ) ) {
					$error = 'cheatin';
					break;
				}

				check_admin_referer( 'jetpack-disconnect' );
				Jetpack::log( 'disconnect' );
				Jetpack::disconnect();
				wp_safe_redirect( Jetpack::admin_url( 'disconnected=true' ) );
				exit;

The method admin_page_load() contains an exit expression.

			case 'reconnect' :
				if ( ! current_user_can( 'jetpack_reconnect' ) ) {
					$error = 'cheatin';
					break;
				}

				check_admin_referer( 'jetpack-reconnect' );
				Jetpack::log( 'reconnect' );
				$this->disconnect();
				wp_redirect( $this->build_connect_url( true ) );
				exit;

The method admin_page_load() contains an exit expression.

			case 'deactivate' :
				if ( ! current_user_can( 'jetpack_deactivate_modules' ) ) {
					$error = 'cheatin';
					break;
				}

				$modules = stripslashes( $_GET['module'] );
				check_admin_referer( "jetpack_deactivate-$modules" );
				foreach ( explode( ',', $modules ) as $module ) {
					Jetpack::log( 'deactivate', $module );
					Jetpack::deactivate_module( $module );
					Jetpack::state( 'message', 'module_deactivated' );
				}
				Jetpack::state( 'module', $modules );
				wp_safe_redirect( Jetpack::admin_url( 'page=jetpack' ) );
				exit;

The method admin_page_load() contains an exit expression.

			case 'unlink' :
				$redirect = isset( $_GET['redirect'] ) ? $_GET['redirect'] : '';
				check_admin_referer( 'jetpack-unlink' );
				Jetpack::log( 'unlink' );
				$this->unlink_user();
				Jetpack::state( 'message', 'unlinked' );
				if ( 'sub-unlink' == $redirect ) {
					wp_safe_redirect( admin_url() );
				} else {
					wp_safe_redirect( Jetpack::admin_url( array( 'page' => $redirect ) ) );
				}
				exit;

The method admin_page_load() contains an exit expression.

			default:
				/**
				 * Fires when a Jetpack admin page is loaded with an unrecognized parameter.
				 *
				 * @since 2.6.0
				 *
				 * @param string sanitize_key( $_GET['action'] ) Unrecognized URL parameter.
				 */
				do_action( 'jetpack_unrecognized_action', sanitize_key( $_GET['action'] ) );
			}
		}

		if ( ! $error = $error ? $error : Jetpack::state( 'error' ) ) {
			self::activate_new_modules( true );
		}

		switch ( $error ) {
		case 'cheatin' :
			$this->error = __( 'Cheatin’ uh?', 'jetpack' );
			break;
		case 'access_denied' :
			$this->error = __( 'You need to authorize the Jetpack connection between your site and WordPress.com to enable the awesome features.', 'jetpack' );
			break;
		case 'wrong_state' :
			$this->error = __( 'Don’t cross the streams!  You need to stay logged in to your WordPress blog while you authorize Jetpack.', 'jetpack' );
			break;
		case 'invalid_client' :
			// @todo re-register instead of deactivate/reactivate

Comments for TODO tasks are often forgotten in the code; it might be better to use a dedicated issue tracker.

			$this->error = __( 'Return to sender.  Whoops! It looks like you got the wrong Jetpack in the mail; deactivate then reactivate the Jetpack plugin to get a new one.', 'jetpack' );
			break;
		case 'invalid_grant' :
			$this->error = __( 'Wrong size.  Hm… it seems your Jetpack doesn’t quite fit.  Have you lost weight? Click “Connect to WordPress.com” again to get your Jetpack adjusted.', 'jetpack' );
			break;
		case 'site_inaccessible' :
		case 'site_requires_authorization' :
			$this->error = sprintf( __( 'Your website needs to be publicly accessible to use Jetpack: %s', 'jetpack' ), "<code>$error</code>" );
			break;
		case 'module_activation_failed' :
			$module = Jetpack::state( 'module' );
			if ( ! empty( $module ) && $mod = Jetpack::get_module( $module ) ) {
				$this->error = sprintf( __( '%s could not be activated because it triggered a <strong>fatal error</strong>. Perhaps there is a conflict with another plugin you have installed?', 'jetpack' ), $mod['name'] );
				if ( isset( $this->plugins_to_deactivate[$module] ) ) {
					$this->error .= ' ' . sprintf( __( 'Do you still have the %s plugin installed?', 'jetpack' ), $this->plugins_to_deactivate[$module][1] );
				}
			} else {
				$this->error = __( 'Module could not be activated because it triggered a <strong>fatal error</strong>. Perhaps there is a conflict with another plugin you have installed?', 'jetpack' );
			}
			if ( $php_errors = Jetpack::state( 'php_errors' ) ) {
				$this->error .= "<br />\n";
				$this->error .= $php_errors;
			}
			break;
		case 'master_user_required' :
			$module = Jetpack::state( 'module' );
			$module_name = '';
			if ( ! empty( $module ) && $mod = Jetpack::get_module( $module ) ) {
				$module_name = $mod['name'];
			}

			$master_user = Jetpack_Options::get_option( 'master_user' );
			$master_userdata = get_userdata( $master_user ) ;
			if ( $master_userdata ) {
				if ( ! in_array( $module, Jetpack::get_active_modules() ) ) {
					$this->error = sprintf( __( '%s was not activated.' , 'jetpack' ), $module_name );
				} else {
					$this->error = sprintf( __( '%s was not deactivated.' , 'jetpack' ), $module_name );
				}
				$this->error .= '  ' . sprintf( __( 'This module can only be altered by %s, the user who initiated the Jetpack connection on this site.' , 'jetpack' ), esc_html( $master_userdata->display_name ) );

			} else {
				$this->error = sprintf( __( 'Only the user who initiated the Jetpack connection on this site can toggle %s, but that user no longer exists. This should not happen.', 'jetpack' ), $module_name );
			}
			break;
		case 'not_public' :
			$this->error = __( '<strong>Your Jetpack has a glitch.</strong> Connecting this site with WordPress.com is not possible. This usually means your site is not publicly accessible (localhost).', 'jetpack' );
			break;
		case 'wpcom_408' :
		case 'wpcom_5??' :
		case 'wpcom_bad_response' :
		case 'wpcom_outage' :
			$this->error = __( 'WordPress.com is currently having problems and is unable to fuel up your Jetpack.  Please try again later.', 'jetpack' );
			break;
		case 'register_http_request_failed' :
		case 'token_http_request_failed' :
			$this->error = sprintf( __( 'Jetpack could not contact WordPress.com: %s.  This usually means something is incorrectly configured on your web host.', 'jetpack' ), "<code>$error</code>" );
			break;
		default :

There must be no space before the colon in a DEFAULT statement

			if ( empty( $error ) ) {
				break;
			}
			$error = trim( substr( strip_tags( $error ), 0, 20 ) );
			// no break: fall through
		case 'no_role' :

// no break: fall through case 'no_role': does not seem to be reachable.

		case 'no_cap' :
		case 'no_code' :
		case 'no_state' :
		case 'invalid_state' :
		case 'invalid_request' :
		case 'invalid_scope' :
		case 'unsupported_response_type' :
		case 'invalid_token' :
		case 'no_token' :
		case 'missing_secrets' :
		case 'home_missing' :
		case 'siteurl_missing' :
		case 'gmt_offset_missing' :
		case 'site_name_missing' :
		case 'secret_1_missing' :
		case 'secret_2_missing' :
		case 'site_lang_missing' :
		case 'home_malformed' :
		case 'siteurl_malformed' :
		case 'gmt_offset_malformed' :
		case 'timezone_string_malformed' :
		case 'site_name_malformed' :
		case 'secret_1_malformed' :
		case 'secret_2_malformed' :
		case 'site_lang_malformed' :
		case 'secrets_mismatch' :
		case 'verify_secret_1_missing' :
		case 'verify_secret_1_malformed' :
		case 'verify_secrets_missing' :
		case 'verify_secrets_mismatch' :
			$error = esc_html( $error );
			$this->error = sprintf( __( '<strong>Your Jetpack has a glitch.</strong>  Something went wrong that&#8217;s never supposed to happen.  Guess you&#8217;re just lucky: %s', 'jetpack' ), "<code>$error</code>" );
			if ( ! Jetpack::is_active() ) {
				$this->error .= '<br />';
				$this->error .= sprintf( __( 'Try connecting again.', 'jetpack' ) );
			}
			break;
		}

		$message_code = Jetpack::state( 'message' );

		$active_state = Jetpack::state( 'activated_modules' );
		if ( ! empty( $active_state ) ) {
			$available    = Jetpack::get_available_modules();
			$active_state = explode( ',', $active_state );
			$active_state = array_intersect( $active_state, $available );
			if ( count( $active_state ) ) {
				foreach ( $active_state as $mod ) {
					$this->stat( 'module-activated', $mod );
				}
			} else {
				$active_state = false;
			}
		}
		if( Jetpack::state( 'optin-manage' ) ) {
			$activated_manage = $message_code;
			$message_code = 'jetpack-manage';

		}
		switch ( $message_code ) {
		case 'modules_activated' :
			$this->message = sprintf(
				__( 'Welcome to <strong>Jetpack %s</strong>!', 'jetpack' ),
				JETPACK__VERSION
			);

			if ( $active_state ) {
				$titles = array();
				foreach ( $active_state as $mod ) {
					if ( $mod_headers = Jetpack::get_module( $mod ) ) {
						$titles[] = '<strong>' . preg_replace( '/\s+(?![^<>]++>)/', '&nbsp;', $mod_headers['name'] ) . '</strong>';
					}
				}
				if ( $titles ) {

The expression $titles of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

					$this->message .= '<br /><br />' . wp_sprintf( __( 'The following new modules have been activated: %l.', 'jetpack' ), $titles );
				}
			}

			if ( $reactive_state = Jetpack::state( 'reactivated_modules' ) ) {
				$titles = array();
				foreach ( explode( ',',  $reactive_state ) as $mod ) {
					if ( $mod_headers = Jetpack::get_module( $mod ) ) {
						$titles[] = '<strong>' . preg_replace( '/\s+(?![^<>]++>)/', '&nbsp;', $mod_headers['name'] ) . '</strong>';
					}
				}
				if ( $titles ) {

The expression $titles of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

					$this->message .= '<br /><br />' . wp_sprintf( __( 'The following modules have been updated: %l.', 'jetpack' ), $titles );
				}
			}

			$this->message .= Jetpack::jetpack_comment_notice();
			break;
		case 'jetpack-manage':
			$this->message = '<strong>' . sprintf( __( 'You are all set! Your site can now be managed from <a href="%s" target="_blank">wordpress.com/sites</a>.', 'jetpack' ), 'https://wordpress.com/sites' ) . '</strong>';
			if ( $activated_manage ) {

The variable $activated_manage does not seem to be defined for all execution paths leading up to this point.

				$this->message .= '<br /><strong>' . __( 'Manage has been activated for you!', 'jetpack'  ) . '</strong>';
			}
			break;
		case 'module_activated' :
			if ( $module = Jetpack::get_module( Jetpack::state( 'module' ) ) ) {
				$this->message = sprintf( __( '<strong>%s Activated!</strong> You can deactivate at any time by clicking the Deactivate link next to each module.', 'jetpack' ), $module['name'] );
				$this->stat( 'module-activated', Jetpack::state( 'module' ) );
			}
			break;

		case 'module_deactivated' :
			$modules = Jetpack::state( 'module' );
			if ( ! $modules ) {
				break;
			}

			$module_names = array();
			foreach ( explode( ',', $modules ) as $module_slug ) {
				$module = Jetpack::get_module( $module_slug );
				if ( $module ) {
					$module_names[] = $module['name'];
				}

				$this->stat( 'module-deactivated', $module_slug );
			}

			if ( ! $module_names ) {

The expression $module_names of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using empty($expr) instead to make it clear that you intend to check for an array without elements.

				break;
			}

			$this->message = wp_sprintf(
				_nx(
					'<strong>%l Deactivated!</strong> You can activate it again at any time using the activate link next to each module.',
					'<strong>%l Deactivated!</strong> You can activate them again at any time using the activate links next to each module.',
					count( $module_names ),
					'%l = list of Jetpack module/feature names',
					'jetpack'
				),
				$module_names
			);
			break;

		case 'module_configured' :
			$this->message = __( '<strong>Module settings were saved.</strong> ', 'jetpack' );
			break;

		case 'already_authorized' :
			$this->message = __( '<strong>Your Jetpack is already connected.</strong> ', 'jetpack' );
			break;

		case 'authorized' :
			$this->message  = __( '<strong>You&#8217;re fueled up and ready to go, Jetpack is now active.</strong> ', 'jetpack' );
			$this->message .= Jetpack::jetpack_comment_notice();
			break;

		case 'linked' :
			$this->message  = __( '<strong>You&#8217;re fueled up and ready to go.</strong> ', 'jetpack' );
			$this->message .= Jetpack::jetpack_comment_notice();
			break;

		case 'unlinked' :
			$user = wp_get_current_user();
			$this->message = sprintf( __( '<strong>You have unlinked your account (%s) from WordPress.com.</strong>', 'jetpack' ), $user->user_login );
			break;

		case 'switch_master' :
			global $current_user;
			$is_master_user = $current_user->ID == Jetpack_Options::get_option( 'master_user' );
			$master_userdata = get_userdata( Jetpack_Options::get_option( 'master_user' ) );
			if ( $is_master_user ) {
				$this->message = __( 'You have successfully set yourself as Jetpack’s primary user.', 'jetpack' );
			} else {
				$this->message = sprintf( _x( 'You have successfully set %s as Jetpack’s primary user.', '%s is a username', 'jetpack' ), $master_userdata->user_login );
			}
			break;
		}

		$deactivated_plugins = Jetpack::state( 'deactivated_plugins' );

		if ( ! empty( $deactivated_plugins ) ) {
			$deactivated_plugins = explode( ',', $deactivated_plugins );
			$deactivated_titles  = array();
			foreach ( $deactivated_plugins as $deactivated_plugin ) {
				if ( ! isset( $this->plugins_to_deactivate[$deactivated_plugin] ) ) {
					continue;
				}

				$deactivated_titles[] = '<strong>' . str_replace( ' ', '&nbsp;', $this->plugins_to_deactivate[$deactivated_plugin][1] ) . '</strong>';
			}

			if ( $deactivated_titles ) {

The expression $deactivated_titles of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

				if ( $this->message ) {
					$this->message .= "<br /><br />\n";
				}

				$this->message .= wp_sprintf(
					_n(
						'Jetpack contains the most recent version of the old %l plugin.',
						'Jetpack contains the most recent versions of the old %l plugins.',
						count( $deactivated_titles ),
						'jetpack'
					),
					$deactivated_titles
				);

				$this->message .= "<br />\n";

				$this->message .= _n(
					'The old version has been deactivated and can be removed from your site.',
					'The old versions have been deactivated and can be removed from your site.',
					count( $deactivated_titles ),
					'jetpack'
				);
			}
		}

		$this->privacy_checks = Jetpack::state( 'privacy_checks' );

		if ( $this->message || $this->error || $this->privacy_checks || $this->can_display_jetpack_manage_notice() ) {
			add_action( 'jetpack_notices', array( $this, 'admin_notices' ) );
		}

		if ( isset( $_GET['configure'] ) && Jetpack::is_module( $_GET['configure'] ) && current_user_can( 'manage_options' ) ) {
			/**
			 * Fires when a module configuration page is loaded.
			 * The dynamic part of the hook is the configure parameter from the URL.
			 *
			 * @since 1.1.0
			 */
			do_action( 'jetpack_module_configuration_load_' . $_GET['configure'] );
		}

		add_filter( 'jetpack_short_module_description', 'wptexturize' );
	}

	function admin_notices() {

		if ( $this->error ) {
?>
<div id="message" class="jetpack-message jetpack-err">
	<div class="squeezer">
		<h2><?php echo wp_kses( $this->error, array( 'code' => true, 'strong' => true, 'br' => true, 'b' => true ) ); ?></h2>
<?php	if ( $desc = Jetpack::state( 'error_description' ) ) : ?>
		<p><?php echo esc_html( stripslashes( $desc ) ); ?></p>
<?php	endif; ?>
	</div>
</div>
<?php
		}

		if ( $this->message ) {
?>
<div id="message" class="jetpack-message">
	<div class="squeezer">
		<h2><?php echo wp_kses( $this->message, array( 'strong' => array(), 'a' => array( 'href' => true ), 'br' => true ) ); ?></h2>
	</div>
</div>
<?php
		}

		if ( $this->privacy_checks ) :
			$module_names = $module_slugs = array();

			$privacy_checks = explode( ',', $this->privacy_checks );
			$privacy_checks = array_filter( $privacy_checks, array( 'Jetpack', 'is_module' ) );
			foreach ( $privacy_checks as $module_slug ) {
				$module = Jetpack::get_module( $module_slug );
				if ( ! $module ) {
					continue;
				}

				$module_slugs[] = $module_slug;
				$module_names[] = "<strong>{$module['name']}</strong>";
			}

			$module_slugs = join( ',', $module_slugs );
?>
<div id="message" class="jetpack-message jetpack-err">
	<div class="squeezer">
		<h2><strong><?php esc_html_e( 'Is this site private?', 'jetpack' ); ?></strong></h2><br />
		<p><?php
			echo wp_kses(
				wptexturize(
					wp_sprintf(
						_nx(
							"Like your site's RSS feeds, %l allows access to your posts and other content to third parties.",
							"Like your site's RSS feeds, %l allow access to your posts and other content to third parties.",
							count( $privacy_checks ),
							'%l = list of Jetpack module/feature names',
							'jetpack'
						),
						$module_names
					)
				),
				array( 'strong' => true )
			);

			echo "\n<br />\n";

			echo wp_kses(
				sprintf(
					_nx(
						'If your site is not publicly accessible, consider <a href="%1$s" title="%2$s">deactivating this feature</a>.',
						'If your site is not publicly accessible, consider <a href="%1$s" title="%2$s">deactivating these features</a>.',
						count( $privacy_checks ),
						'%1$s = deactivation URL, %2$s = "Deactivate {list of Jetpack module/feature names}',
						'jetpack'
					),
					wp_nonce_url(
						Jetpack::admin_url(
							array(
								'page'   => 'jetpack',
								'action' => 'deactivate',
								'module' => urlencode( $module_slugs ),
							)
						),
						"jetpack_deactivate-$module_slugs"
					),
					esc_attr( wp_kses( wp_sprintf( _x( 'Deactivate %l', '%l = list of Jetpack module/feature names', 'jetpack' ), $module_names ), array() ) )
				),
				array( 'a' => array( 'href' => true, 'title' => true ) )
			);
		?></p>
	</div>
</div>
<?php endif;
	// only display the notice if the other stuff is not there
	if( $this->can_display_jetpack_manage_notice() && !  $this->error && ! $this->message && ! $this->privacy_checks ) {
		if( isset( $_GET['page'] ) && 'jetpack' != $_GET['page'] )
			$this->opt_in_jetpack_manage_notice();
		}
	}

	/**
	 * Record a stat for later output.  This will only currently output in the admin_footer.
	 */
	function stat( $group, $detail ) {
		if ( ! isset( $this->stats[ $group ] ) )
			$this->stats[ $group ] = array();
		$this->stats[ $group ][] = $detail;
	}

	/**
	 * Load stats pixels. $group is auto-prefixed with "x_jetpack-"
	 */
	function do_stats( $method = '' ) {
		if ( is_array( $this->stats ) && count( $this->stats ) ) {
			foreach ( $this->stats as $group => $stats ) {
				if ( is_array( $stats ) && count( $stats ) ) {
					$args = array( "x_jetpack-{$group}" => implode( ',', $stats ) );
					if ( 'server_side' === $method ) {
						self::do_server_side_stat( $args );
					} else {
						echo '<img src="' . esc_url( self::build_stats_url( $args ) ) . '" width="1" height="1" style="display:none;" />';
					}
				}
				unset( $this->stats[ $group ] );
			}
		}
	}

	/**
	 * Runs stats code for a one-off, server-side.
	 *
	 * @param $args array|string The arguments to append to the URL. Should include `x_jetpack-{$group}={$stats}` or whatever we want to store.
	 *
	 * @return bool If it worked.
	 */
	static function do_server_side_stat( $args ) {
		$response = wp_remote_get( esc_url_raw( self::build_stats_url( $args ) ) );
		if ( is_wp_error( $response ) )
			return false;

		if ( 200 !== wp_remote_retrieve_response_code( $response ) )
			return false;

		return true;
	}

	/**
	 * Builds the stats url.
	 *
	 * @param $args array|string The arguments to append to the URL.
	 *
	 * @return string The URL to be pinged.
	 */
	static function build_stats_url( $args ) {
		$defaults = array(
			'v'    => 'wpcom2',
			'rand' => md5( mt_rand( 0, 999 ) . time() ),
		);
		$args     = wp_parse_args( $args, $defaults );
		/**
		 * Filter the URL used as the Stats tracking pixel.
		 *
		 * @since 2.3.2
		 *
		 * @param string $url Base URL used as the Stats tracking pixel.
		 */
		$base_url = apply_filters(
			'jetpack_stats_base_url',
			set_url_scheme( 'http://pixel.wp.com/g.gif' )
		);
		$url      = add_query_arg( $args, $base_url );
		return $url;
	}

	function translate_current_user_to_role() {
		foreach ( $this->capability_translations as $role => $cap ) {
			if ( current_user_can( $role ) || current_user_can( $cap ) ) {
				return $role;
			}
		}

		return false;
	}

	function translate_role_to_cap( $role ) {
		if ( ! isset( $this->capability_translations[$role] ) ) {
			return false;
		}

		return $this->capability_translations[$role];
	}

	function sign_role( $role ) {
		if ( ! $user_id = (int) get_current_user_id() ) {
			return false;
		}

		$token = Jetpack_Data::get_access_token();
		if ( ! $token || is_wp_error( $token ) ) {
			return false;
		}

		return $role . ':' . hash_hmac( 'md5', "{$role}|{$user_id}", $token->secret );
	}

	function build_connect_url( $raw = false, $redirect = false ) {
		if ( ! Jetpack_Options::get_option( 'blog_token' ) || ! Jetpack_Options::get_option( 'id' ) ) {
			$url = Jetpack::nonce_url_no_esc( Jetpack::admin_url( 'action=register' ), 'jetpack-register' );
			if( is_network_admin() ) {
			    $url = add_query_arg( 'is_multisite', network_admin_url(
			    'admin.php?page=jetpack-settings' ), $url );
			}
		} else {
			$role = $this->translate_current_user_to_role();
			$signed_role = $this->sign_role( $role );

			$user = wp_get_current_user();

			$redirect = $redirect ? esc_url_raw( $redirect ) : '';

			if( isset( $_REQUEST['is_multisite'] ) ) {
				$redirect = Jetpack_Network::init()->get_url( 'network_admin_page' );
			}

			$args = urlencode_deep(
				array(
					'response_type' => 'code',
					'client_id'     => Jetpack_Options::get_option( 'id' ),
					'redirect_uri'  => add_query_arg(
						array(
							'action'   => 'authorize',
							'_wpnonce' => wp_create_nonce( "jetpack-authorize_{$role}_{$redirect}" ),
							'redirect' => $redirect ? urlencode( $redirect ) : false,
						),
						menu_page_url( 'jetpack', false )
					),
					'state'         => $user->ID,
					'scope'         => $signed_role,
					'user_email'    => $user->user_email,
					'user_login'    => $user->user_login,
					'is_active'     => Jetpack::is_active(),
					'jp_version'    => JETPACK__VERSION,
				)
			);

			$url = add_query_arg( $args, Jetpack::api_url( 'authorize' ) );
		}

		return $raw ? $url : esc_url( $url );
	}

	function build_reconnect_url( $raw = false ) {
		$url = wp_nonce_url( Jetpack::admin_url( 'action=reconnect' ), 'jetpack-reconnect' );
		return $raw ? $url : esc_url( $url );
	}

	public static function admin_url( $args = null ) {
		$args = wp_parse_args( $args, array( 'page' => 'jetpack' ) );
		$url = add_query_arg( $args, admin_url( 'admin.php' ) );
		return $url;
	}

	public static function nonce_url_no_esc( $actionurl, $action = -1, $name = '_wpnonce' ) {
		$actionurl = str_replace( '&amp;', '&', $actionurl );
		return add_query_arg( $name, wp_create_nonce( $action ), $actionurl );
	}

	function dismiss_jetpack_notice() {

		if ( ! isset( $_GET['jetpack-notice'] ) ) {
			return;
		}

		switch( $_GET['jetpack-notice'] ) {
			case 'dismiss':
				if ( check_admin_referer( 'jetpack-deactivate' ) && ! is_plugin_active_for_network( plugin_basename( JETPACK__PLUGIN_DIR . 'jetpack.php' ) ) ) {

					require_once ABSPATH . 'wp-admin/includes/plugin.php';
					deactivate_plugins( JETPACK__PLUGIN_DIR . 'jetpack.php', false, false );
					wp_safe_redirect( admin_url() . 'plugins.php?deactivate=true&plugin_status=all&paged=1&s=' );
				}
				break;
			case 'jetpack-manage-opt-out':

				if ( check_admin_referer( 'jetpack_manage_banner_opt_out' ) ) {
					// Don't show the banner again

					Jetpack_Options::update_option( 'dismissed_manage_banner', true );
					// redirect back to the page that had the notice
					if ( wp_get_referer() ) {
						wp_safe_redirect( wp_get_referer() );
					} else {
						// Take me to Jetpack
						wp_safe_redirect( admin_url( 'admin.php?page=jetpack' ) );
					}
				}
				break;
			case 'jetpack-protect-multisite-opt-out':

				if ( check_admin_referer( 'jetpack_protect_multisite_banner_opt_out' ) ) {
					// Don't show the banner again

					update_site_option( 'jetpack_dismissed_protect_multisite_banner', true );
					// redirect back to the page that had the notice
					if ( wp_get_referer() ) {
						wp_safe_redirect( wp_get_referer() );
					} else {
						// Take me to Jetpack
						wp_safe_redirect( admin_url( 'admin.php?page=jetpack' ) );
					}
				}
				break;
			case 'jetpack-manage-opt-in':
				if ( check_admin_referer( 'jetpack_manage_banner_opt_in' ) ) {
					// This makes sure that we are redirect to jetpack home so that we can see the Success Message.

					$redirection_url = Jetpack::admin_url();
					remove_action( 'jetpack_pre_activate_module',   array( Jetpack_Admin::init(), 'fix_redirect' ) );

					// Don't redirect form the Jetpack Setting Page
					$referer_parsed = parse_url ( wp_get_referer() );
					// check that we do have a wp_get_referer and the query paramater is set orderwise go to the Jetpack Home
					if ( isset( $referer_parsed['query'] ) && false !== strpos( $referer_parsed['query'], 'page=jetpack_modules' ) ) {
						// Take the user to Jetpack home except when on the setting page
						$redirection_url = wp_get_referer();
						add_action( 'jetpack_pre_activate_module',   array( Jetpack_Admin::init(), 'fix_redirect' ) );
					}
					// Also update the JSON API FULL MANAGEMENT Option
					Jetpack::activate_module( 'manage', false, false );

					// Special Message when option in.
					Jetpack::state( 'optin-manage', 'true' );
					// Activate the Module if not activated already

					// Redirect properly
					wp_safe_redirect( $redirection_url );

				}
				break;
		}
	}

	function debugger_page() {
		nocache_headers();
		if ( ! current_user_can( 'manage_options' ) ) {
			die( '-1' );

The method debugger_page() contains an exit expression.

		}
		Jetpack_Debugger::jetpack_debug_display_handler();
		exit;

The method debugger_page() contains an exit expression.

	}

	public static function admin_screen_configure_module( $module_id ) {

		// User that doesn't have 'jetpack_configure_modules' will never end up here since Jetpack Landing Page woun't let them.
		if ( ! in_array( $module_id, Jetpack::get_active_modules() ) && current_user_can( 'manage_options' ) ) {
			if ( has_action( 'display_activate_module_setting_' . $module_id ) ) {
				/**
				 * Fires to diplay a custom module activation screen.
				 *
				 * To add a module actionation screen use Jetpack::module_configuration_activation_screen method.
				 * Example: Jetpack::module_configuration_activation_screen( 'manage', array( $this, 'manage_activate_screen' ) );
				 *
				 * @module manage
				 *
				 * @since 3.8.0
				 *
				 * @param int $module_id Module ID.
				 */
				do_action( 'display_activate_module_setting_' . $module_id );
			} else {
				self::display_activate_module_link( $module_id );
			}

			return false;
		} ?>

		<div id="jp-settings-screen" style="position: relative">
			<h3>
			<?php
				$module = Jetpack::get_module( $module_id );
				echo '<a href="' . Jetpack::admin_url( 'page=jetpack_modules' ) . '">' . __( 'Jetpack by WordPress.com', 'jetpack' ) . '</a> &rarr; ';
				printf( __( 'Configure %s', 'jetpack' ), $module['name'] );
			?>
			</h3>
			<?php
				/**
				 * Fires within the displayed message when a feature configuation is updated.
				 *
				 * @since 3.4.0
				 *
				 * @param int $module_id Module ID.
				 */
				do_action( 'jetpack_notices_update_settings', $module_id );
				/**
				 * Fires when a feature configuation screen is loaded.
				 * The dynamic part of the hook, $module_id, is the module ID.
				 *
				 * @since 1.1.0
				 */
				do_action( 'jetpack_module_configuration_screen_' . $module_id );
			?>
		</div><?php
	}

	/**
	 * Display link to activate the module to see the settings screen.
	 * @param  string $module_id
	 * @return null
	 */
	public static function display_activate_module_link( $module_id ) {

		$info =  Jetpack::get_module( $module_id );
		$extra = '';
		$activate_url = wp_nonce_url(
				Jetpack::admin_url(
					array(
						'page'   => 'jetpack',
						'action' => 'activate',
						'module' => $module_id,
					)
				),
				"jetpack_activate-$module_id"
			);

		?>

		<div class="wrap configure-module">
			<div id="jp-settings-screen">
				<?php
				if ( $module_id == 'json-api' ) {

					$info['name'] = esc_html__( 'Activate Site Management and JSON API', 'jetpack' );

					$activate_url = Jetpack::init()->opt_in_jetpack_manage_url();

					$info['description'] = sprintf( __( 'Manage your multiple Jetpack sites from our centralized dashboard at wordpress.com/sites. <a href="%s" target="_blank">Learn more</a>.', 'jetpack' ), 'http://jetpack.me/support/site-management' );

					// $extra = __( 'To use Site Management, you need to first activate JSON API to allow remote management of your site. ', 'jetpack' );

47% of this comment could be valid code. Did you maybe forget this after debugging?

				} ?>

				<h3><?php echo esc_html( $info['name'] ); ?></h3>
				<div class="narrow">
					<p><?php echo  $info['description']; ?></p>
					<?php if( $extra ) { ?>
					<p><?php echo esc_html( $extra ); ?></p>
					<?php } ?>
					<p>
						<?php
						if( wp_get_referer() ) {
							printf( __( '<a class="button-primary" href="%s">Activate Now</a> or <a href="%s" >return to previous page</a>.', 'jetpack' ) , $activate_url, wp_get_referer() );
						} else {
							printf( __( '<a class="button-primary" href="%s">Activate Now</a>', 'jetpack' ) , $activate_url  );
						} ?>
					</p>
				</div>

			</div>
		</div>

		<?php
	}

	public static function sort_modules( $a, $b ) {
		if ( $a['sort'] == $b['sort'] )
			return 0;

		return ( $a['sort'] < $b['sort'] ) ? -1 : 1;
	}

	function sync_reindex_trigger() {
		if ( $this->current_user_is_connection_owner() && current_user_can( 'manage_options' ) ) {
			echo json_encode( $this->sync->reindex_trigger() );
		} else {
			echo '{"status":"ERROR"}';
		}
		exit;

The method sync_reindex_trigger() contains an exit expression.

	}

	function sync_reindex_status(){
		if ( $this->current_user_is_connection_owner() && current_user_can( 'manage_options' ) ) {
			echo json_encode( $this->sync->reindex_status() );
		} else {
			echo '{"status":"ERROR"}';
		}
		exit;

The method sync_reindex_status() contains an exit expression.

	}

/* Client API */

	/**
	 * Returns the requested Jetpack API URL
	 *
	 * @return string
	 */
	public static function api_url( $relative_url ) {
		return trailingslashit( JETPACK__API_BASE . $relative_url  ) . JETPACK__API_VERSION . '/';
	}

	/**
	 * Some hosts disable the OpenSSL extension and so cannot make outgoing HTTPS requsets
	 */
	public static function fix_url_for_bad_hosts( $url ) {
		if ( 0 !== strpos( $url, 'https://' ) ) {
			return $url;
		}

		switch ( JETPACK_CLIENT__HTTPS ) {
			case 'ALWAYS' :
				return $url;
			case 'NEVER' :
				return set_url_scheme( $url, 'http' );
			// default : case 'AUTO' :

50% of this comment could be valid code. Did you maybe forget this after debugging?

		}

		// Yay! Your host is good!
		if ( self::permit_ssl() && wp_http_supports( array( 'ssl' => true ) ) ) {
			return $url;
		}

		// Boo! Your host is bad and makes Jetpack cry!
		return set_url_scheme( $url, 'http' );
	}

	/**
	 * Checks to see if the URL is using SSL to connect with Jetpack
	 *
	 * @since 2.3.3
	 * @return boolean
	 */
	public static function permit_ssl( $force_recheck = false ) {
		// Do some fancy tests to see if ssl is being supported
		if ( $force_recheck || false === ( $ssl = get_transient( 'jetpack_https_test' ) ) ) {
			if ( 'https' !== substr( JETPACK__API_BASE, 0, 5 ) ) {
				$ssl = 0;
			} else {
				switch ( JETPACK_CLIENT__HTTPS ) {
					case 'NEVER':
						$ssl = 0;
						break;
					case 'ALWAYS':
					case 'AUTO':
					default:
						$ssl = 1;
						break;
				}

				// If it's not 'NEVER', test to see
				if ( $ssl ) {
					$response = wp_remote_get( JETPACK__API_BASE . 'test/1/' );
					if ( is_wp_error( $response ) || ( 'OK' !== wp_remote_retrieve_body( $response ) ) ) {
						$ssl = 0;
					}
				}
			}
			set_transient( 'jetpack_https_test', $ssl, DAY_IN_SECONDS );
		}

		return (bool) $ssl;
	}

	/*
	 * Displays an admin_notice, alerting the user to their JETPACK_CLIENT__HTTPS constant being 'ALWAYS' but SSL isn't working.
	 */
	public function alert_required_ssl_fail() {
		if ( ! current_user_can( 'manage_options' ) )
			return;
		?>

		<div id="message" class="error jetpack-message jp-identity-crisis">
			<div class="jp-banner__content">
				<h2><?php _e( 'Something is being cranky!', 'jetpack' ); ?></h2>
				<p><?php _e( 'Your site is configured to only permit SSL connections to Jetpack, but SSL connections don\'t seem to be functional!', 'jetpack' ); ?></p>
			</div>
		</div>

		<?php
	}

	/**
	 * Returns the Jetpack XML-RPC API
	 *
	 * @return string
	 */
	public static function xmlrpc_api_url() {
		$base = preg_replace( '#(https?://[^?/]+)(/?.*)?$#', '\\1', JETPACK__API_BASE );
		return untrailingslashit( $base ) . '/xmlrpc.php';
	}

	/**
	 * Creates two secret tokens and the end of life timestamp for them.
	 *
	 * Note these tokens are unique per call, NOT static per site for connecting.
	 *
	 * @since 2.6
	 * @return array
	 */
	public function generate_secrets() {
	    $secrets = array(
		wp_generate_password( 32, false ), // secret_1
		wp_generate_password( 32, false ), // secret_2
		( time() + 600 ), // eol ( End of Life )
	    );

	    return $secrets;
	}

	/**
	 * Builds the timeout limit for queries talking with the wpcom servers.
	 *
	 * Based on local php max_execution_time in php.ini
	 *
	 * @since 2.6
	 * @return int
	 **/
	public function get_remote_query_timeout_limit() {
	    $timeout = (int) ini_get( 'max_execution_time' );
	    if ( ! $timeout ) // Ensure exec time set in php.ini
		$timeout = 30;
	    return intval( $timeout / 2 );
	}


	/**
	 * Takes the response from the Jetpack register new site endpoint and
	 * verifies it worked properly.
	 *
	 * @since 2.6
	 * @return true or Jetpack_Error
	 **/
	public function validate_remote_register_response( $response ) {
	    	if ( is_wp_error( $response ) ) {
			return new Jetpack_Error( 'register_http_request_failed', $response->get_error_message() );
		}

		$code   = wp_remote_retrieve_response_code( $response );
		$entity = wp_remote_retrieve_body( $response );
		if ( $entity )
			$json = json_decode( $entity );
		else
			$json = false;

		$code_type = intval( $code / 100 );
		if ( 5 == $code_type ) {
			return new Jetpack_Error( 'wpcom_5??', sprintf( __( 'Error Details: %s', 'jetpack' ), $code ), $code );
		} elseif ( 408 == $code ) {
			return new Jetpack_Error( 'wpcom_408', sprintf( __( 'Error Details: %s', 'jetpack' ), $code ), $code );
		} elseif ( ! empty( $json->error ) ) {
			$error_description = isset( $json->error_description ) ? sprintf( __( 'Error Details: %s', 'jetpack' ), (string) $json->error_description ) : '';
			return new Jetpack_Error( (string) $json->error, $error_description, $code );
		} elseif ( 200 != $code ) {
			return new Jetpack_Error( 'wpcom_bad_response', sprintf( __( 'Error Details: %s', 'jetpack' ), $code ), $code );
		}

		// Jetpack ID error block
		if ( empty( $json->jetpack_id ) ) {
			return new Jetpack_Error( 'jetpack_id', sprintf( __( 'Error Details: Jetpack ID is empty. Do not publicly post this error message! %s', 'jetpack' ), $entity ), $entity );
		} elseif ( ! is_scalar( $json->jetpack_id ) ) {
			return new Jetpack_Error( 'jetpack_id', sprintf( __( 'Error Details: Jetpack ID is not a scalar. Do not publicly post this error message! %s', 'jetpack' ) , $entity ), $entity );
		} elseif ( preg_match( '/[^0-9]/', $json->jetpack_id ) ) {
			return new Jetpack_Error( 'jetpack_id', sprintf( __( 'Error Details: Jetpack ID begins with a numeral. Do not publicly post this error message! %s', 'jetpack' ) , $entity ), $entity );
		}

	    return true;
	}
	/**
	 * @return bool|WP_Error
	 */
	public static function register() {
		add_action( 'pre_update_jetpack_option_register', array( 'Jetpack_Options', 'delete_option' ) );
		$secrets = Jetpack::init()->generate_secrets();

		Jetpack_Options::update_option( 'register', $secrets[0] . ':' . $secrets[1] . ':' . $secrets[2] );

		@list( $secret_1, $secret_2, $secret_eol ) = explode( ':', Jetpack_Options::get_option( 'register' ) );

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

		if ( empty( $secret_1 ) || empty( $secret_2 ) || empty( $secret_eol ) || $secret_eol < time() ) {
			return new Jetpack_Error( 'missing_secrets' );
		}

		$timeout = Jetpack::init()->get_remote_query_timeout_limit();

		$gmt_offset = get_option( 'gmt_offset' );
		if ( ! $gmt_offset ) {
			$gmt_offset = 0;
		}

		$stats_options = get_option( 'stats_options' );
		$stats_id = isset($stats_options['blog_id']) ? $stats_options['blog_id'] : null;

		$args = array(
			'method'  => 'POST',
			'body'    => array(
				'siteurl'         => site_url(),
				'home'            => home_url(),
				'gmt_offset'      => $gmt_offset,
				'timezone_string' => (string) get_option( 'timezone_string' ),
				'site_name'       => (string) get_option( 'blogname' ),
				'secret_1'        => $secret_1,
				'secret_2'        => $secret_2,
				'site_lang'       => get_locale(),
				'timeout'         => $timeout,
				'stats_id'        => $stats_id,
			),
			'headers' => array(
				'Accept' => 'application/json',
			),
			'timeout' => $timeout,
		);
		$response = Jetpack_Client::_wp_remote_request( Jetpack::fix_url_for_bad_hosts( Jetpack::api_url( 'register' ) ), $args, true );


		// Make sure the response is valid and does not contain any Jetpack errors
		$valid_response = Jetpack::init()->validate_remote_register_response( $response );
		if( is_wp_error( $valid_response ) || !$valid_response ) {
		    return $valid_response;
		}

		// Grab the response values to work with
		$code   = wp_remote_retrieve_response_code( $response );
		$entity = wp_remote_retrieve_body( $response );

		if ( $entity )
			$json = json_decode( $entity );
		else
			$json = false;

		if ( empty( $json->jetpack_secret ) || ! is_string( $json->jetpack_secret ) )
			return new Jetpack_Error( 'jetpack_secret', '', $code );

		if ( isset( $json->jetpack_public ) ) {
			$jetpack_public = (int) $json->jetpack_public;
		} else {
			$jetpack_public = false;
		}

		Jetpack_Options::update_options(
			array(
				'id'         => (int)    $json->jetpack_id,
				'blog_token' => (string) $json->jetpack_secret,
				'public'     => $jetpack_public,
			)
		);

		/**
		 * Fires when a site is registered on WordPress.com.
		 *
		 * @since 3.7.0
		 *
		 * @param int $json->jetpack_id Jetpack Blog ID.
		 * @param string $json->jetpack_secret Jetpack Blog Token.
		 * @param int|bool $jetpack_public Is the site public.
		 */
		do_action( 'jetpack_site_registered', $json->jetpack_id, $json->jetpack_secret, $jetpack_public );

		// Initialize Jump Start for the first and only time.
		if ( ! Jetpack_Options::get_option( 'jumpstart' ) ) {
			Jetpack_Options::update_option( 'jumpstart', 'new_connection' );

			$jetpack = Jetpack::init();

			$jetpack->stat( 'jumpstart', 'unique-views' );
			$jetpack->do_stats( 'server_side' );
		};

		return true;
	}

	/**
	 * If the db version is showing something other that what we've got now, bump it to current.
	 *
	 * @return bool: True if the option was incorrect and updated, false if nothing happened.

The doc-type bool: could not be parsed: Unknown type name "bool:" at position 0. (view supported doc-types)

	 */
	public static function maybe_set_version_option() {
		list( $version ) = explode( ':', Jetpack_Options::get_option( 'version' ) );
		if ( JETPACK__VERSION != $version ) {
			Jetpack_Options::update_option( 'version', JETPACK__VERSION . ':' . time() );
			return true;
		}
		return false;
	}

/* Client Server API */

	/**
	 * Loads the Jetpack XML-RPC client
	 */
	public static function load_xml_rpc_client() {
		require_once ABSPATH . WPINC . '/class-IXR.php';
		require_once JETPACK__PLUGIN_DIR . 'class.jetpack-ixr-client.php';
	}

	function verify_xml_rpc_signature() {
		if ( $this->xmlrpc_verification ) {
			return $this->xmlrpc_verification;
		}

		// It's not for us
		if ( ! isset( $_GET['token'] ) || empty( $_GET['signature'] ) ) {
			return false;
		}

		@list( $token_key, $version, $user_id ) = explode( ':', $_GET['token'] );

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

		if (
			empty( $token_key )
		||
			empty( $version ) || strval( JETPACK__API_VERSION ) !== $version
		) {
			return false;
		}

		if ( '0' === $user_id ) {
			$token_type = 'blog';
			$user_id = 0;
		} else {
			$token_type = 'user';
			if ( empty( $user_id ) || ! ctype_digit( $user_id ) ) {
				return false;
			}
			$user_id = (int) $user_id;

			$user = new WP_User( $user_id );
			if ( ! $user || ! $user->exists() ) {
				return false;
			}
		}

		$token = Jetpack_Data::get_access_token( $user_id );

$user_id is of type integer, but the function expects a boolean.

		if ( ! $token ) {
			return false;
		}

		$token_check = "$token_key.";
		if ( ! hash_equals( substr( $token->secret, 0, strlen( $token_check ) ), $token_check ) ) {
			return false;
		}

		require_once JETPACK__PLUGIN_DIR . 'class.jetpack-signature.php';

		$jetpack_signature = new Jetpack_Signature( $token->secret, (int) Jetpack_Options::get_option( 'time_diff' ) );
		if ( isset( $_POST['_jetpack_is_multipart'] ) ) {
			$post_data   = $_POST;
			$file_hashes = array();
			foreach ( $post_data as $post_data_key => $post_data_value ) {
				if ( 0 !== strpos( $post_data_key, '_jetpack_file_hmac_' ) ) {
					continue;
				}
				$post_data_key = substr( $post_data_key, strlen( '_jetpack_file_hmac_' ) );
				$file_hashes[$post_data_key] = $post_data_value;
			}

			foreach ( $file_hashes as $post_data_key => $post_data_value ) {
				unset( $post_data["_jetpack_file_hmac_{$post_data_key}"] );
				$post_data[$post_data_key] = $post_data_value;
			}

			ksort( $post_data );

			$body = http_build_query( stripslashes_deep( $post_data ) );
		} elseif ( is_null( $this->HTTP_RAW_POST_DATA ) ) {
			$body = file_get_contents( 'php://input' );
		} else {
			$body = null;
		}
		$signature = $jetpack_signature->sign_current_request(
			array( 'body' => is_null( $body ) ? $this->HTTP_RAW_POST_DATA : $body, )
		);

		if ( ! $signature ) {
			return false;
		} else if ( is_wp_error( $signature ) ) {
			return $signature;
		} else if ( ! hash_equals( $signature, $_GET['signature'] ) ) {
			return false;
		}

		$timestamp = (int) $_GET['timestamp'];
		$nonce     = stripslashes( (string) $_GET['nonce'] );

		if ( ! $this->add_nonce( $timestamp, $nonce ) ) {
			return false;
		}

		$this->xmlrpc_verification = array(
			'type'    => $token_type,
			'user_id' => $token->external_user_id,
		);

		return $this->xmlrpc_verification;
	}

	/**
	 * Authenticates XML-RPC and other requests from the Jetpack Server
	 */
	function authenticate_jetpack( $user, $username, $password ) {

The parameter $username is not used and could be removed.

The parameter $password is not used and could be removed.

		if ( is_a( $user, 'WP_User' ) ) {
			return $user;
		}

		$token_details = $this->verify_xml_rpc_signature();

		if ( ! $token_details || is_wp_error( $token_details ) ) {
			return $user;
		}

		if ( 'user' !== $token_details['type'] ) {
			return $user;
		}

		if ( ! $token_details['user_id'] ) {
			return $user;
		}

		nocache_headers();

		return new WP_User( $token_details['user_id'] );
	}

	function add_nonce( $timestamp, $nonce ) {
		global $wpdb;
		static $nonces_used_this_request = array();

		if ( isset( $nonces_used_this_request["$timestamp:$nonce"] ) ) {
			return $nonces_used_this_request["$timestamp:$nonce"];
		}

		// This should always have gone through Jetpack_Signature::sign_request() first to check $timestamp an $nonce
		$timestamp = (int) $timestamp;
		$nonce     = esc_sql( $nonce );

		// Raw query so we can avoid races: add_option will also update
		$show_errors = $wpdb->show_errors( false );

		$old_nonce = $wpdb->get_row(
			$wpdb->prepare( "SELECT * FROM `$wpdb->options` WHERE option_name = %s", "jetpack_nonce_{$timestamp}_{$nonce}" )
		);

		if ( is_null( $old_nonce ) ) {
			$return = $wpdb->query(
				$wpdb->prepare(
					"INSERT INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, %s)",
					"jetpack_nonce_{$timestamp}_{$nonce}",
					time(),
					'no'
				)
			);
		} else {
			$return = false;
		}

		$wpdb->show_errors( $show_errors );

		$nonces_used_this_request["$timestamp:$nonce"] = $return;

		return $return;
	}

	/**
	 * In some setups, $HTTP_RAW_POST_DATA can be emptied during some IXR_Server paths since it is passed by reference to various methods.
	 * Capture it here so we can verify the signature later.
	 */
	function xmlrpc_methods( $methods ) {
		$this->HTTP_RAW_POST_DATA = $GLOBALS['HTTP_RAW_POST_DATA'];
		return $methods;
	}

	function public_xmlrpc_methods( $methods ) {
		if ( array_key_exists( 'wp.getOptions', $methods ) ) {
			$methods['wp.getOptions'] = array( $this, 'jetpack_getOptions' );
		}
		return $methods;
	}

	function jetpack_getOptions( $args ) {
		global $wp_xmlrpc_server;

		$wp_xmlrpc_server->escape( $args );

		$username	= $args[1];
		$password	= $args[2];

		if ( !$user = $wp_xmlrpc_server->login($username, $password) ) {
			return $wp_xmlrpc_server->error;
		}

		$options = array();
		$user_data = $this->get_connected_user_data();
		if ( is_array( $user_data ) ) {
			$options['jetpack_user_id'] = array(
				'desc'          => __( 'The WP.com user ID of the connected user', 'jetpack' ),
				'readonly'      => true,
				'value'         => $user_data['ID'],
			);
			$options['jetpack_user_login'] = array(
				'desc'          => __( 'The WP.com username of the connected user', 'jetpack' ),
				'readonly'      => true,
				'value'         => $user_data['login'],
			);
			$options['jetpack_user_email'] = array(
				'desc'          => __( 'The WP.com user email of the connected user', 'jetpack' ),
				'readonly'      => true,
				'value'         => $user_data['email'],
			);
			$options['jetpack_user_site_count'] = array(
				'desc'          => __( 'The number of sites of the connected WP.com user', 'jetpack' ),
				'readonly'      => true,
				'value'         => $user_data['site_count'],
			);
		}
		$wp_xmlrpc_server->blog_options = array_merge( $wp_xmlrpc_server->blog_options, $options );
		$args = stripslashes_deep( $args );
		return $wp_xmlrpc_server->wp_getOptions( $args );
	}

	function xmlrpc_options( $options ) {
		$jetpack_client_id = false;
		if ( self::is_active() ) {
			$jetpack_client_id = Jetpack_Options::get_option( 'id' );
		}
		$options['jetpack_version'] = array(
				'desc'          => __( 'Jetpack Plugin Version', 'jetpack' ),
				'readonly'      => true,
				'value'         => JETPACK__VERSION,
		);

		$options['jetpack_client_id'] = array(
				'desc'          => __( 'The Client ID/WP.com Blog ID of this site', 'jetpack' ),
				'readonly'      => true,
				'value'         => $jetpack_client_id,
		);
		return $options;
	}

	public static function clean_nonces( $all = false ) {
		global $wpdb;

		$sql = "DELETE FROM `$wpdb->options` WHERE `option_name` LIKE %s";
		if ( method_exists ( $wpdb , 'esc_like' ) ) {
			$sql_args = array( $wpdb->esc_like( 'jetpack_nonce_' ) . '%' );
		} else {
			$sql_args = array( like_escape( 'jetpack_nonce_' ) . '%' );
		}

		if ( true !== $all ) {
			$sql .= ' AND CAST( `option_value` AS UNSIGNED ) < %d';
			$sql_args[] = time() - 3600;
		}

		$sql .= ' ORDER BY `option_id` LIMIT 100';

		$sql = $wpdb->prepare( $sql, $sql_args );

		for ( $i = 0; $i < 1000; $i++ ) {
			if ( ! $wpdb->query( $sql ) ) {
				break;
			}
		}
	}

	/**
	 * State is passed via cookies from one request to the next, but never to subsequent requests.
	 * SET: state( $key, $value );
	 * GET: $value = state( $key );
	 *
	 * @param string $key

Should the type for parameter $key not be string|null?

	 * @param string $value

Should the type for parameter $value not be string|null?

	 * @param bool $restate private
	 */
	public static function state( $key = null, $value = null, $restate = false ) {
		static $state = array();
		static $path, $domain;
		if ( ! isset( $path ) ) {
			require_once( ABSPATH . 'wp-admin/includes/plugin.php' );
			$admin_url = Jetpack::admin_url();
			$bits      = parse_url( $admin_url );

			if ( is_array( $bits ) ) {
				$path   = ( isset( $bits['path'] ) ) ? dirname( $bits['path'] ) : null;
				$domain = ( isset( $bits['host'] ) ) ? $bits['host'] : null;
			} else {
				$path = $domain = null;
			}
		}

		// Extract state from cookies and delete cookies
		if ( isset( $_COOKIE[ 'jetpackState' ] ) && is_array( $_COOKIE[ 'jetpackState' ] ) ) {
			$yum = $_COOKIE[ 'jetpackState' ];
			unset( $_COOKIE[ 'jetpackState' ] );
			foreach ( $yum as $k => $v ) {
				if ( strlen( $v ) )
					$state[ $k ] = $v;
				setcookie( "jetpackState[$k]", false, 0, $path, $domain );
			}
		}

		if ( $restate ) {
			foreach ( $state as $k => $v ) {
				setcookie( "jetpackState[$k]", $v, 0, $path, $domain );
			}
			return;
		}

		// Get a state variable
		if ( isset( $key ) && ! isset( $value ) ) {
			if ( array_key_exists( $key, $state ) )
				return $state[ $key ];
			return null;
		}

		// Set a state variable
		if ( isset ( $key ) && isset( $value ) ) {
			if( is_array( $value ) && isset( $value[0] ) ) {
				$value = $value[0];
			}
			$state[ $key ] = $value;
			setcookie( "jetpackState[$key]", $value, 0, $path, $domain );
		}
	}

	public static function restate() {
		Jetpack::state( null, null, true );
	}

	public static function check_privacy( $file ) {
		static $is_site_publicly_accessible = null;

		if ( is_null( $is_site_publicly_accessible ) ) {
			$is_site_publicly_accessible = false;

			Jetpack::load_xml_rpc_client();
			$rpc = new Jetpack_IXR_Client();

			$success = $rpc->query( 'jetpack.isSitePubliclyAccessible', home_url() );
			if ( $success ) {
				$response = $rpc->getResponse();
				if ( $response ) {
					$is_site_publicly_accessible = true;
				}
			}

			Jetpack_Options::update_option( 'public', (int) $is_site_publicly_accessible );
		}

		if ( $is_site_publicly_accessible ) {
			return;
		}

		$module_slug = self::get_module_slug( $file );

		$privacy_checks = Jetpack::state( 'privacy_checks' );
		if ( ! $privacy_checks ) {
			$privacy_checks = $module_slug;
		} else {
			$privacy_checks .= ",$module_slug";
		}

		Jetpack::state( 'privacy_checks', $privacy_checks );
	}

	/**
	 * Helper method for multicall XMLRPC.
	 */
	public static function xmlrpc_async_call() {
		global $blog_id;
		static $clients = array();

		$client_blog_id = is_multisite() ? $blog_id : 0;

		if ( ! isset( $clients[$client_blog_id] ) ) {
			Jetpack::load_xml_rpc_client();
			$clients[$client_blog_id] = new Jetpack_IXR_ClientMulticall( array( 'user_id' => JETPACK_MASTER_USER, ) );
			if ( function_exists( 'ignore_user_abort' ) ) {
				ignore_user_abort( true );
			}
			add_action( 'shutdown', array( 'Jetpack', 'xmlrpc_async_call' ) );
		}

		$args = func_get_args();

		if ( ! empty( $args[0] ) ) {
			call_user_func_array( array( $clients[$client_blog_id], 'addCall' ), $args );
		} elseif ( is_multisite() ) {
			foreach ( $clients as $client_blog_id => $client ) {
				if ( ! $client_blog_id || empty( $client->calls ) ) {
					continue;
				}

				$switch_success = switch_to_blog( $client_blog_id, true );
				if ( ! $switch_success ) {
					continue;
				}

				flush();
				$client->query();

				restore_current_blog();
			}
		} else {
			if ( isset( $clients[0] ) && ! empty( $clients[0]->calls ) ) {
				flush();
				$clients[0]->query();
			}
		}
	}

	public static function staticize_subdomain( $url ) {

		// Extract hostname from URL
		$host = parse_url( $url, PHP_URL_HOST );

		// Explode hostname on '.'
		$exploded_host = explode( '.', $host );

		// Retrieve the name and TLD
		if ( count( $exploded_host ) > 1 ) {
			$name = $exploded_host[ count( $exploded_host ) - 2 ];
			$tld = $exploded_host[ count( $exploded_host ) - 1 ];
			// Rebuild domain excluding subdomains
			$domain = $name . '.' . $tld;
		} else {
			$domain = $host;
		}
		// Array of Automattic domains
		$domain_whitelist = array( 'wordpress.com', 'wp.com' );

		// Return $url if not an Automattic domain
		if ( ! in_array( $domain, $domain_whitelist ) ) {
			return $url;
		}

		if ( is_ssl() ) {
			return preg_replace( '|https?://[^/]++/|', 'https://s-ssl.wordpress.com/', $url );
		}

		srand( crc32( basename( $url ) ) );
		$static_counter = rand( 0, 2 );
		srand(); // this resets everything that relies on this, like array_rand() and shuffle()

		return preg_replace( '|://[^/]+?/|', "://s$static_counter.wp.com/", $url );
	}

/* JSON API Authorization */

	/**
	 * Handles the login action for Authorizing the JSON API
	 */
	function login_form_json_api_authorization() {
		$this->verify_json_api_authorization_request();

		add_action( 'wp_login', array( &$this, 'store_json_api_authorization_token' ), 10, 2 );

		add_action( 'login_message', array( &$this, 'login_message_json_api_authorization' ) );
		add_action( 'login_form', array( &$this, 'preserve_action_in_login_form_for_json_api_authorization' ) );
		add_filter( 'site_url', array( &$this, 'post_login_form_to_signed_url' ), 10, 3 );
	}

	// Make sure the login form is POSTed to the signed URL so we can reverify the request
	function post_login_form_to_signed_url( $url, $path, $scheme ) {
		if ( 'wp-login.php' !== $path || ( 'login_post' !== $scheme && 'login' !== $scheme ) ) {
			return $url;
		}

		$parsed_url = parse_url( $url );
		$url = strtok( $url, '?' );
		$url = "$url?{$_SERVER['QUERY_STRING']}";
		if ( ! empty( $parsed_url['query'] ) )
			$url .= "&{$parsed_url['query']}";

		return $url;
	}

	// Make sure the POSTed request is handled by the same action
	function preserve_action_in_login_form_for_json_api_authorization() {
		echo "<input type='hidden' name='action' value='jetpack_json_api_authorization' />\n";
		echo "<input type='hidden' name='jetpack_json_api_original_query' value='" . esc_url( set_url_scheme( $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] ) ) . "' />\n";
	}

	// If someone logs in to approve API access, store the Access Code in usermeta
	function store_json_api_authorization_token( $user_login, $user ) {
		add_filter( 'login_redirect', array( &$this, 'add_token_to_login_redirect_json_api_authorization' ), 10, 3 );
		add_filter( 'allowed_redirect_hosts', array( &$this, 'allow_wpcom_public_api_domain' ) );
		$token = wp_generate_password( 32, false );
		update_user_meta( $user->ID, 'jetpack_json_api_' . $this->json_api_authorization_request['client_id'], $token );
	}

	// Add public-api.wordpress.com to the safe redirect whitelist - only added when someone allows API access
	function allow_wpcom_public_api_domain( $domains ) {
		$domains[] = 'public-api.wordpress.com';
		return $domains;
	}

	// Add the Access Code details to the public-api.wordpress.com redirect
	function add_token_to_login_redirect_json_api_authorization( $redirect_to, $original_redirect_to, $user ) {
		return add_query_arg(
			urlencode_deep(
				array(
					'jetpack-code'    => get_user_meta( $user->ID, 'jetpack_json_api_' . $this->json_api_authorization_request['client_id'], true ),
					'jetpack-user-id' => (int) $user->ID,
					'jetpack-state'   => $this->json_api_authorization_request['state'],
				)
			),
			$redirect_to
		);
	}

	// Verifies the request by checking the signature
	function verify_json_api_authorization_request() {
		require_once JETPACK__PLUGIN_DIR . 'class.jetpack-signature.php';

		$token = Jetpack_Data::get_access_token( JETPACK_MASTER_USER );
		if ( ! $token || empty( $token->secret ) ) {
			wp_die( __( 'You must connect your Jetpack plugin to WordPress.com to use this feature.' , 'jetpack' ) );
		}

		$die_error = __( 'Someone may be trying to trick you into giving them access to your site.  Or it could be you just encountered a bug :).  Either way, please close this window.', 'jetpack' );

		$jetpack_signature = new Jetpack_Signature( $token->secret, (int) Jetpack_Options::get_option( 'time_diff' ) );

		if ( isset( $_POST['jetpack_json_api_original_query'] ) ) {
			$signature = $jetpack_signature->sign_request( $_GET['token'], $_GET['timestamp'], $_GET['nonce'], '', 'GET', $_POST['jetpack_json_api_original_query'], null, true );
		} else {
			$signature = $jetpack_signature->sign_current_request( array( 'body' => null, 'method' => 'GET' ) );
		}

		if ( ! $signature ) {
			wp_die( $die_error );
		} else if ( is_wp_error( $signature ) ) {
			wp_die( $die_error );
		} else if ( $signature !== $_GET['signature'] ) {
			if ( is_ssl() ) {
				// If we signed an HTTP request on the Jetpack Servers, but got redirected to HTTPS by the local blog, check the HTTP signature as well
				$signature = $jetpack_signature->sign_current_request( array( 'scheme' => 'http', 'body' => null, 'method' => 'GET' ) );
				if ( ! $signature || is_wp_error( $signature ) || $signature !== $_GET['signature'] ) {
					wp_die( $die_error );
				}
			} else {
				wp_die( $die_error );
			}
		}

		$timestamp = (int) $_GET['timestamp'];
		$nonce     = stripslashes( (string) $_GET['nonce'] );

		if ( ! $this->add_nonce( $timestamp, $nonce ) ) {
			// De-nonce the nonce, at least for 5 minutes.
			// We have to reuse this nonce at least once (used the first time when the initial request is made, used a second time when the login form is POSTed)
			$old_nonce_time = get_option( "jetpack_nonce_{$timestamp}_{$nonce}" );
			if ( $old_nonce_time < time() - 300 ) {
				wp_die( __( 'The authorization process expired.  Please go back and try again.' , 'jetpack' ) );
			}
		}

		$data = json_decode( base64_decode( stripslashes( $_GET['data'] ) ) );
		$data_filters = array(
			'state'        => 'opaque',
			'client_id'    => 'int',
			'client_title' => 'string',
			'client_image' => 'url',
		);

		foreach ( $data_filters as $key => $sanitation ) {
			if ( ! isset( $data->$key ) ) {
				wp_die( $die_error );
			}

			switch ( $sanitation ) {
			case 'int' :
				$this->json_api_authorization_request[$key] = (int) $data->$key;
				break;
			case 'opaque' :
				$this->json_api_authorization_request[$key] = (string) $data->$key;
				break;
			case 'string' :
				$this->json_api_authorization_request[$key] = wp_kses( (string) $data->$key, array() );
				break;
			case 'url' :
				$this->json_api_authorization_request[$key] = esc_url_raw( (string) $data->$key );
				break;
			}
		}

		if ( empty( $this->json_api_authorization_request['client_id'] ) ) {
			wp_die( $die_error );
		}
	}

	function login_message_json_api_authorization( $message ) {

The parameter $message is not used and could be removed.

		return '<p class="message">' . sprintf(
			esc_html__( '%s wants to access your site&#8217;s data.  Log in to authorize that access.' , 'jetpack' ),
			'<strong>' . esc_html( $this->json_api_authorization_request['client_title'] ) . '</strong>'
		) . '<img src="' . esc_url( $this->json_api_authorization_request['client_image'] ) . '" /></p>';
	}

	/**
	 * Get $content_width, but with a <s>twist</s> filter.
	 */
	public static function get_content_width() {
		$content_width = isset( $GLOBALS['content_width'] ) ? $GLOBALS['content_width'] : false;
		/**
		 * Filter the Content Width value.
		 *
		 * @since 2.2.3
		 *
		 * @param string $content_width Content Width value.
		 */
		return apply_filters( 'jetpack_content_width', $content_width );
	}

	/**
	 * Centralize the function here until it gets added to core.
	 *
	 * @param int|string|object $id_or_email A user ID,  email address, or comment object
	 * @param int $size Size of the avatar image
	 * @param string $default URL to a default image to use if no avatar is available
	 * @param bool $force_display Whether to force it to return an avatar even if show_avatars is disabled
	 *
	 * @return array First element is the URL, second is the class.
	 */
	public static function get_avatar_url( $id_or_email, $size = 96, $default = '', $force_display = false ) {
		// Don't bother adding the __return_true filter if it's already there.
		$has_filter = has_filter( 'pre_option_show_avatars', '__return_true' );

		if ( $force_display && ! $has_filter )
			add_filter( 'pre_option_show_avatars', '__return_true' );

		$avatar = get_avatar( $id_or_email, $size, $default );

		if ( $force_display && ! $has_filter )
			remove_filter( 'pre_option_show_avatars', '__return_true' );

		// If no data, fail out.
		if ( is_wp_error( $avatar ) || ! $avatar )
			return array( null, null );

		// Pull out the URL.  If it's not there, fail out.
		if ( ! preg_match( '/src=["\']([^"\']+)["\']/', $avatar, $url_matches ) )
			return array( null, null );
		$url = wp_specialchars_decode( $url_matches[1], ENT_QUOTES );

		// Pull out the class, but it's not a big deal if it's missing.
		$class = '';
		if ( preg_match( '/class=["\']([^"\']+)["\']/', $avatar, $class_matches ) )
			$class = wp_specialchars_decode( $class_matches[1], ENT_QUOTES );

		return array( $url, $class );
	}

	/**
	 * Pings the WordPress.com Mirror Site for the specified options.
	 *
	 * @param string|array $option_names The option names to request from the WordPress.com Mirror Site
	 *
	 * @return array An associative array of the option values as stored in the WordPress.com Mirror Site
	 */
	public function get_cloud_site_options( $option_names ) {
		$option_names = array_filter( (array) $option_names, 'is_string' );

		Jetpack::load_xml_rpc_client();
		$xml = new Jetpack_IXR_Client( array( 'user_id' => JETPACK_MASTER_USER, ) );
		$xml->query( 'jetpack.fetchSiteOptions', $option_names );
		if ( $xml->isError() ) {
			return array(
				'error_code' => $xml->getErrorCode(),
				'error_msg'  => $xml->getErrorMessage(),
			);
		}
		$cloud_site_options = $xml->getResponse();

		return $cloud_site_options;
	}

	/**
	 * Fetch the filtered array of options that we should compare to determine an identity crisis.
	 *
	 * @return array An array of options to check.
	 */
	public static function identity_crisis_options_to_check() {
		$options = array(
			'siteurl',
			'home',
		);
		/**
		 * Filter the options that we should compare to determine an identity crisis.
		 *
		 * @since 2.5.0
		 *
		 * @param array $options Array of options to compare to determine an identity crisis.
		 */
		return apply_filters( 'jetpack_identity_crisis_options_to_check', $options );
	}

	/**
	 * Checks to make sure that local options have the same values as remote options.  Will cache the results for up to 24 hours.
	 *
	 * @param bool $force_recheck Whether to ignore any cached transient and manually re-check.
	 *
	 * @return array An array of options that do not match.  If everything is good, it will evaluate to false.
	 */
	public static function check_identity_crisis( $force_recheck = false ) {
		if ( ! Jetpack::is_active() || Jetpack::is_development_mode() )
			return false;

		if ( $force_recheck || false === ( $errors = get_transient( 'jetpack_has_identity_crisis' ) ) ) {
			$options_to_check = self::identity_crisis_options_to_check();
			$cloud_options = Jetpack::init()->get_cloud_site_options( $options_to_check );
			$errors        = array();

			foreach ( $cloud_options as $cloud_key => $cloud_value ) {

				// If it's not the same as the local value...
				if ( $cloud_value !== get_option( $cloud_key ) ) {

					// Break out if we're getting errors.  We are going to check the error keys later when we alert.
					if ( 'error_code' == $cloud_key ) {
						$errors[ $cloud_key ] = $cloud_value;
						break;
					}

					$parsed_cloud_value = parse_url( $cloud_value );
					// If the current options is an IP address
					if ( filter_var( $parsed_cloud_value['host'], FILTER_VALIDATE_IP ) ) {
						// Give the new value a Jetpack to fly in to the clouds
						Jetpack::resolve_identity_crisis( $cloud_key );
						continue;
					}

					// And it's not been added to the whitelist...
					if ( ! self::is_identity_crisis_value_whitelisted( $cloud_key, $cloud_value ) ) {
						/*
						 * This should be a temporary hack until a cleaner solution is found.
						 *
						 * The siteurl and home can be set to use http in General > Settings
						 * however some constants can be defined that can force https in wp-admin
						 * when this happens wpcom can confuse wporg with a fake identity
						 * crisis with a mismatch of http vs https when it should be allowed.
						 * we need to check that here.
						 *
						 * @see https://github.com/Automattic/jetpack/issues/1006
						 */
						if ( ( 'home' == $cloud_key || 'siteurl' == $cloud_key )
							&& ( substr( $cloud_value, 0, 8 ) == "https://" )
							&& Jetpack::init()->is_ssl_required_to_visit_site() ) {
							// Ok, we found a mismatch of http and https because of wp-config, not an invalid url
							continue;
						}


						// Then kick an error!
						$errors[ $cloud_key ] = $cloud_value;
					}
				}
			}
		}

		/**
		 * Filters the errors returned when checking for an Identity Crisis.
		 *
		 * @since 2.3.2
		 *
		 * @param array $errors Array of Identity Crisis errors.
		 * @param bool $force_recheck Ignore any cached transient and manually re-check. Default to false.
		 */
		return apply_filters( 'jetpack_has_identity_crisis', $errors, $force_recheck );
	}

	/*
	 * Resolve ID crisis
	 *
	 * If the URL has changed, but the rest of the options are the same (i.e. blog/user tokens)
	 * The user has the option to update the shadow site with the new URL before a new
	 * token is created.
	 *
	 * @param $key : Which option to sync.  null defautlts to home and siteurl
	 */
	public static function resolve_identity_crisis( $key = null ) {
		if ( $key ) {
			$identity_options = array( $key );
		} else {
			$identity_options = self::identity_crisis_options_to_check();
		}

		if ( is_array( $identity_options ) ) {
			foreach( $identity_options as $identity_option ) {
				Jetpack_Sync::sync_options( __FILE__, $identity_option );

				/**
				 * Fires when a shadow site option is updated.
				 * These options are updated via the Identity Crisis UI.
				 * $identity_option is the option that gets updated.
				 *
				 * @since 3.7.0
				 */
				do_action( "update_option_{$identity_option}" );
			}
		}
	}

	/*
	 * Whitelist URL
	 *
	 * Ignore the URL differences between the blog and the shadow site.
	 */
	public static function whitelist_current_url() {
		$options_to_check = Jetpack::identity_crisis_options_to_check();
		$cloud_options = Jetpack::init()->get_cloud_site_options( $options_to_check );

		foreach ( $cloud_options as $cloud_key => $cloud_value ) {
			Jetpack::whitelist_identity_crisis_value( $cloud_key, $cloud_value );
		}
	}

	/*
	 * Ajax callbacks for ID crisis resolutions
	 *
	 * Things that could happen here:
	 *  - site_migrated : Update the URL on the shadow blog to match new domain
	 *  - whitelist     : Ignore the URL difference
	 *  - default       : Error message
	 */
	public static function resolve_identity_crisis_ajax_callback() {
		check_ajax_referer( 'resolve-identity-crisis', 'ajax-nonce' );

		switch ( $_POST[ 'crisis_resolution_action' ] ) {
			case 'site_migrated':
				Jetpack::resolve_identity_crisis();
				echo 'resolved';
				break;

			case 'whitelist':
				Jetpack::whitelist_current_url();
				echo 'whitelisted';
				break;

			case 'reset_connection':
				// Delete the options first so it doesn't get confused which site to disconnect dotcom-side
				Jetpack_Options::delete_option(
					array(
						'register',
						'blog_token',
						'user_token',
						'user_tokens',
						'master_user',
						'time_diff',
						'fallback_no_verify_ssl_certs',
						'id',
					)
				);
				delete_transient( 'jetpack_has_identity_crisis' );

				echo 'reset-connection-success';
				break;

			default:
				echo 'missing action';
				break;
		}

		wp_die();
	}

	/**
	 * Adds a value to the whitelist for the specified key.
	 *
	 * @param string $key The option name that we're whitelisting the value for.
	 * @param string $value The value that we're intending to add to the whitelist.
	 *
	 * @return bool Whether the value was added to the whitelist, or false if it was already there.
	 */
	public static function whitelist_identity_crisis_value( $key, $value ) {
		if ( Jetpack::is_identity_crisis_value_whitelisted( $key, $value ) ) {
			return false;
		}

		$whitelist = Jetpack_Options::get_option( 'identity_crisis_whitelist', array() );
		if ( empty( $whitelist[ $key ] ) || ! is_array( $whitelist[ $key ] ) ) {
			$whitelist[ $key ] = array();
		}
		array_push( $whitelist[ $key ], $value );

		Jetpack_Options::update_option( 'identity_crisis_whitelist', $whitelist );
		return true;
	}

	/**
	 * Checks whether a value is already whitelisted.
	 *
	 * @param string $key The option name that we're checking the value for.
	 * @param string $value The value that we're curious to see if it's on the whitelist.
	 *
	 * @return bool Whether the value is whitelisted.
	 */
	public static function is_identity_crisis_value_whitelisted( $key, $value ) {
		$whitelist = Jetpack_Options::get_option( 'identity_crisis_whitelist', array() );
		if ( ! empty( $whitelist[ $key ] ) && is_array( $whitelist[ $key ] ) && in_array( $value, $whitelist[ $key ] ) ) {
			return true;
		}
		return false;
	}

	/**
	 * Checks whether the home and siteurl specifically are whitelisted
	 * Written so that we don't have re-check $key and $value params every time
	 * we want to check if this site is whitelisted, for example in footer.php
	 *
	 * @return bool True = already whitelsisted False = not whitelisted
	 */
	public static function jetpack_is_staging_site() {
		$current_whitelist = Jetpack_Options::get_option( 'identity_crisis_whitelist' );
		if ( ! $current_whitelist ) {
			return false;
		}

		$options_to_check  = Jetpack::identity_crisis_options_to_check();
		$cloud_options     = Jetpack::init()->get_cloud_site_options( $options_to_check );

		foreach ( $cloud_options as $cloud_key => $cloud_value ) {
			if ( ! self::is_identity_crisis_value_whitelisted( $cloud_key, $cloud_value ) ) {
				return false;
			}
		}
		return true;
	}

	public function identity_crisis_js( $nonce ) {
?>
<script>
(function( $ ) {
	var SECOND_IN_MS = 1000;

	function contactSupport( e ) {
		e.preventDefault();
		$( '.jp-id-crisis-question' ).hide();
		$( '#jp-id-crisis-contact-support' ).show();
	}

	function autodismissSuccessBanner() {
		$( '.jp-identity-crisis' ).fadeOut(600); //.addClass( 'dismiss' );
	}

	var data = { action: 'jetpack_resolve_identity_crisis', 'ajax-nonce': '<?php echo $nonce; ?>' };

	$( document ).ready(function() {

		// Site moved: Update the URL on the shadow blog
		$( '.site-moved' ).click(function( e ) {
			e.preventDefault();
			data.crisis_resolution_action = 'site_migrated';
			$( '#jp-id-crisis-question-1 .spinner' ).show();
			$.post( ajaxurl, data, function() {
				$( '.jp-id-crisis-question' ).hide();
				$( '.banner-title' ).hide();
				$( '#jp-id-crisis-success' ).show();
				setTimeout( autodismissSuccessBanner, 6 * SECOND_IN_MS );
			});

		});

		// URL hasn't changed, next question please.
		$( '.site-not-moved' ).click(function( e ) {
			e.preventDefault();
			$( '.jp-id-crisis-question' ).hide();
			$( '#jp-id-crisis-question-2' ).show();
		});

		// Reset connection: two separate sites.
		$( '.reset-connection' ).click(function( e ) {
			data.crisis_resolution_action = 'reset_connection';
			$.post( ajaxurl, data, function( response ) {
				if ( 'reset-connection-success' === response ) {
					window.location.replace( '<?php echo Jetpack::admin_url(); ?>' );
				}
			});
		});

		// It's a dev environment.  Ignore.
		$( '.is-dev-env' ).click(function( e ) {
			data.crisis_resolution_action = 'whitelist';
			$( '#jp-id-crisis-question-2 .spinner' ).show();
			$.post( ajaxurl, data, function() {
				$( '.jp-id-crisis-question' ).hide();
				$( '.banner-title' ).hide();
				$( '#jp-id-crisis-success' ).show();
				setTimeout( autodismissSuccessBanner, 4 * SECOND_IN_MS );
			});
		});

		$( '.not-reconnecting' ).click(contactSupport);
		$( '.not-staging-or-dev' ).click(contactSupport);
	});
})( jQuery );
</script>
<?php
	}

	/**
	 * Displays an admin_notice, alerting the user to an identity crisis.
	 */
	public function alert_identity_crisis() {
		// @todo temporary killing of feature in 3.8.1 as it revealed a number of scenarios not foreseen.

Comments for TODO tasks are often forgotten in the code; it might be better to use a dedicated issue tracker.

		if ( ! Jetpack::is_development_version() ) {
			return;
		}

		// @todo temporary copout for dealing with domain mapping

Comments for TODO tasks are often forgotten in the code; it might be better to use a dedicated issue tracker.

		// @see https://github.com/Automattic/jetpack/issues/2702
		if ( is_multisite() && defined( 'SUNRISE' ) && ! Jetpack::is_development_version() ) {
			return;
		}

		if ( ! current_user_can( 'jetpack_disconnect' ) ) {
			return;
		}

		if ( ! $errors = self::check_identity_crisis() ) {
			return;
		}

		// Only show on dashboard and jetpack pages
		$screen = get_current_screen();
		if ( 'dashboard' !== $screen->base && ! did_action( 'jetpack_notices' ) ) {
			return;
		}

		// Include the js!
		$ajax_nonce = wp_create_nonce( 'resolve-identity-crisis' );
		$this->identity_crisis_js( $ajax_nonce );

		// Include the CSS!
		if ( ! wp_script_is( 'jetpack', 'done' ) ) {
			$this->admin_banner_styles();
		}

		if ( ! array_key_exists( 'error_code', $errors ) ) {
			$key = 'siteurl';
			if ( ! $errors[ $key ] ) {
				$key = 'home';
			}
		} else {
			$key = 'error_code';
			// 401 is the only error we care about.  Any other errors should not trigger the alert.
			if ( 401 !== $errors[ $key ] ) {
				return;
			}
		}

		?>

		<style>
			.jp-identity-crisis .jp-btn-group {
					margin: 15px 0;
				}
			.jp-identity-crisis strong {
					color: #518d2a;
				}
			.jp-identity-crisis.dismiss {
				display: none;
			}
			.jp-identity-crisis .button {
				margin-right: 4px;
			}
		</style>

		<div id="message" class="error jetpack-message jp-identity-crisis stay-visible">
			<div class="service-mark"></div>
			<div class="jp-id-banner__content">
				<!-- <h3 class="banner-title"><?php _e( 'Something\'s not quite right with your Jetpack connection! Let\'s fix that.', 'jetpack' ); ?></h3> -->

				<div class="jp-id-crisis-question" id="jp-id-crisis-question-1">
					<?php
					// 401 means that this site has been disconnected from wpcom, but the remote site still thinks it's connected.
					if ( 'error_code' == $key && '401' == $errors[ $key ] ) : ?>
						<div class="banner-content">
							<p><?php
								/* translators: %s is a URL */
								printf( __( 'Our records show that this site does not have a valid connection to WordPress.com. Please reset your connection to fix this. <a href="%s" target="_blank">What caused this?</a>', 'jetpack' ), 'https://jetpack.me/support/no-valid-wordpress-com-connection/' );
							?></p>
						</div>
						<div class="jp-btn-group">
							<a href="#" class="reset-connection"><?php _e( 'Reset the connection', 'jetpack' ); ?></a>
							<span class="idc-separator">|</span>
							<a href="<?php echo esc_url( wp_nonce_url( Jetpack::admin_url( 'jetpack-notice=dismiss' ), 'jetpack-deactivate' ) ); ?>"><?php _e( 'Deactivate Jetpack', 'jetpack' ); ?></a>
						</div>
					<?php else : ?>
							<div class="banner-content">
							<p><?php printf( __( 'It looks like you may have changed your domain. Is <strong>%1$s</strong> still your site\'s domain, or have you updated it to <strong> %2$s </strong>?', 'jetpack' ), $errors[ $key ], (string) get_option( $key ) ); ?></p>
							</div>
						<div class="jp-btn-group">
							<a href="#" class="regular site-moved"><?php printf( __( '%s is now my domain.', 'jetpack' ), $errors[ $key ] ); ?></a> <span class="idc-separator">|</span> <a href="#" class="site-not-moved" ><?php printf( __( '%s is still my domain.', 'jetpack' ), (string) get_option( $key ) ); ?></a>
							<span class="spinner"></span>
						</div>
					<?php endif ; ?>
				</div>

				<div class="jp-id-crisis-question" id="jp-id-crisis-question-2" style="display: none;">
					<div class="banner-content">
						<p><?php printf(
							/* translators: %1$s, %2$s and %3$s are URLs */

43% of this comment could be valid code. Did you maybe forget this after debugging?

							__(
								'Are <strong> %2$s </strong> and <strong> %1$s </strong> two completely separate websites? If so we should create a new connection, which will reset your followers and linked services. <a href="%3$s"><em>What does this mean?</em></a>',
								'jetpack'
							),
							$errors[ $key ],
							(string) get_option( $key ),
							'https://jetpack.me/support/what-does-resetting-the-connection-mean/'
						); ?></p>
					</div>
					<div class="jp-btn-group">
						<a href="#" class="reset-connection"><?php _e( 'Reset the connection', 'jetpack' ); ?></a> <span class="idc-separator">|</span>
						<a href="#" class="is-dev-env"><?php _e( 'This is a development environment', 'jetpack' ); ?></a> <span class="idc-separator">|</span>
						<a href="https://jetpack.me/contact-support/" class="contact-support"><?php _e( 'Submit a support ticket', 'jetpack' ); ?></a>
						<span class="spinner"></span>
					</div>
				</div>

				<div class="jp-id-crisis-success" id="jp-id-crisis-success" style="display: none;">
					<h3 class="success-notice"><?php printf( __( 'Thanks for taking the time to sort things out. We&#039;ve updated our records accordingly!', 'jetpack' ) ); ?></h3>
				</div>
			</div>
		</div>

		<?php
	}

	/**
	 * Maybe Use a .min.css stylesheet, maybe not.
	 *
	 * Hooks onto `plugins_url` filter at priority 1, and accepts all 3 args.
	 */
	public static function maybe_min_asset( $url, $path, $plugin ) {
		// Short out on things trying to find actual paths.
		if ( ! $path || empty( $plugin ) ) {
			return $url;
		}

		// Strip out the abspath.
		$base = dirname( plugin_basename( $plugin ) );

		// Short out on non-Jetpack assets.
		if ( 'jetpack/' !== substr( $base, 0, 8 ) ) {
			return $url;
		}

		// File name parsing.
		$file              = "{$base}/{$path}";
		$full_path         = JETPACK__PLUGIN_DIR . substr( $file, 8 );
		$file_name         = substr( $full_path, strrpos( $full_path, '/' ) + 1 );
		$file_name_parts_r = array_reverse( explode( '.', $file_name ) );
		$extension         = array_shift( $file_name_parts_r );

		if ( in_array( strtolower( $extension ), array( 'css', 'js' ) ) ) {
			// Already pointing at the minified version.
			if ( 'min' === $file_name_parts_r[0] ) {
				return $url;
			}

			$min_full_path = preg_replace( "#\.{$extension}$#", ".min.{$extension}", $full_path );
			if ( file_exists( $min_full_path ) ) {
				$url = preg_replace( "#\.{$extension}$#", ".min.{$extension}", $url );
			}
		}

		return $url;
	}

	/**
	 * Maybe inlines a stylesheet.
	 *
	 * If you'd like to inline a stylesheet instead of printing a link to it,
	 * wp_style_add_data( 'handle', 'jetpack-inline', true );
	 *
	 * Attached to `style_loader_tag` filter.
	 *
	 * @param string $tag The tag that would link to the external asset.
	 * @param string $handle The registered handle of the script in question.
	 *
	 * @return string
	 */
	public static function maybe_inline_style( $tag, $handle ) {
		global $wp_styles;
		$item = $wp_styles->registered[ $handle ];

		if ( ! isset( $item->extra['jetpack-inline'] ) || ! $item->extra['jetpack-inline'] ) {
			return $tag;
		}

		if ( preg_match( '# href=\'([^\']+)\' #i', $tag, $matches ) ) {
			$href = $matches[1];
			// Strip off query string
			if ( $pos = strpos( $href, '?' ) ) {
				$href = substr( $href, 0, $pos );
			}
			// Strip off fragment
			if ( $pos = strpos( $href, '#' ) ) {
				$href = substr( $href, 0, $pos );
			}
		} else {
			return $tag;
		}

		$plugins_dir = plugin_dir_url( JETPACK__PLUGIN_FILE );
		if ( $plugins_dir !== substr( $href, 0, strlen( $plugins_dir ) ) ) {
			return $tag;
		}

		// If this stylesheet has a RTL version, and the RTL version replaces normal...
		if ( isset( $item->extra['rtl'] ) && 'replace' === $item->extra['rtl'] && is_rtl() ) {
			// And this isn't the pass that actually deals with the RTL version...
			if ( false === strpos( $tag, " id='$handle-rtl-css' " ) ) {
				// Short out, as the RTL version will deal with it in a moment.
				return $tag;
			}
		}

		$file = JETPACK__PLUGIN_DIR . substr( $href, strlen( $plugins_dir ) );
		$css  = Jetpack::absolutize_css_urls( file_get_contents( $file ), $href );
		if ( $css ) {
			$tag = "<!-- Inline {$item->handle} -->\r\n";
			if ( empty( $item->extra['after'] ) ) {
				wp_add_inline_style( $handle, $css );
			} else {
				array_unshift( $item->extra['after'], $css );
				wp_style_add_data( $handle, 'after', $item->extra['after'] );
			}
		}

		return $tag;
	}

	/**
	 * Loads a view file from the views
	 *
	 * Data passed in with the $data parameter will be available in the
	 * template file as $data['value']
	 *
	 * @param string $template - Template file to load
	 * @param array $data - Any data to pass along to the template
	 * @return boolean - If template file was found
	 **/
	public function load_view( $template, $data = array() ) {
		$views_dir = JETPACK__PLUGIN_DIR . 'views/';

		if( file_exists( $views_dir . $template ) ) {
			require_once( $views_dir . $template );
			return true;
		}

		error_log( "Jetpack: Unable to find view file $views_dir$template" );
		return false;
	}

	/**
	 * Sends a ping to the Jetpack servers to toggle on/off remote portions
	 * required by some modules.
	 *
	 * @param string $module_slug
	 */
	public function toggle_module_on_wpcom( $module_slug ) {
		Jetpack::init()->sync->register( 'noop' );

		if ( false !== strpos( current_filter(), 'jetpack_activate_module_' ) ) {
			self::check_privacy( $module_slug );
		}

	}

	/**
	 * Throws warnings for deprecated hooks to be removed from Jetpack
	 */
	public function deprecated_hooks() {
		global $wp_filter;

		/*
		 * Format:
		 * deprecated_filter_name => replacement_name
		 *
		 * If there is no replacement us null for replacement_name
		 */
		$deprecated_list = array(
			'jetpack_bail_on_shortcode' => 'jetpack_shortcodes_to_include',
			'wpl_sharing_2014_1'        => null,
			'jetpack-tools-to-include'  => 'jetpack_tools_to_include',
		);

		// This is a silly loop depth. Better way?
		foreach( $deprecated_list AS $hook => $hook_alt ) {
			if( isset( $wp_filter[ $hook ] ) && is_array( $wp_filter[ $hook ] ) ) {
				foreach( $wp_filter[$hook] AS $func => $values ) {
					foreach( $values AS $hooked ) {
						_deprecated_function( $hook . ' used for ' . $hooked['function'], null, $hook_alt );
					}
				}
			}
		}
	}

	/**
	 * Converts any url in a stylesheet, to the correct absolute url.
	 *
	 * Considerations:
	 *  - Normal, relative URLs     `feh.png`
	 *  - Data URLs                 `data:image/gif;base64,eh129ehiuehjdhsa==`
	 *  - Schema-agnostic URLs      `//domain.com/feh.png`
	 *  - Absolute URLs             `http://domain.com/feh.png`
	 *  - Domain root relative URLs `/feh.png`
	 *
	 * @param $css string: The raw CSS -- should be read in directly from the file.
	 * @param $css_file_url : The URL that the file can be accessed at, for calculating paths from.
	 *
	 * @return mixed|string
	 */
	public static function absolutize_css_urls( $css, $css_file_url ) {
		$pattern = '#url\((?P<path>[^)]*)\)#i';
		$css_dir = dirname( $css_file_url );
		$p       = parse_url( $css_dir );
		$domain  = sprintf(
					'%1$s//%2$s%3$s%4$s',
					isset( $p['scheme'] )           ? "{$p['scheme']}:" : '',
					isset( $p['user'], $p['pass'] ) ? "{$p['user']}:{$p['pass']}@" : '',
					$p['host'],
					isset( $p['port'] )             ? ":{$p['port']}" : ''
				);

		if ( preg_match_all( $pattern, $css, $matches, PREG_SET_ORDER ) ) {
			$find = $replace = array();
			foreach ( $matches as $match ) {
				$url = trim( $match['path'], "'\" \t" );

				// If this is a data url, we don't want to mess with it.
				if ( 'data:' === substr( $url, 0, 5 ) ) {
					continue;
				}

				// If this is an absolute or protocol-agnostic url,
				// we don't want to mess with it.
				if ( preg_match( '#^(https?:)?//#i', $url ) ) {
					continue;
				}

				switch ( substr( $url, 0, 1 ) ) {
					case '/':
						$absolute = $domain . $url;
						break;
					default:
						$absolute = $css_dir . '/' . $url;
				}

				$find[]    = $match[0];
				$replace[] = sprintf( 'url("%s")', $absolute );
			}
			$css = str_replace( $find, $replace, $css );
		}

		return $css;
	}

	/**
	 * This method checks to see if SSL is required by the site in
	 * order to visit it in some way other than only setting the
	 * https value in the home or siteurl values.
	 *
	 * @since 3.2
	 * @return boolean
	 **/
	private function is_ssl_required_to_visit_site() {
		global $wp_version;
		$ssl = is_ssl();

		if ( version_compare( $wp_version, '4.4-alpha', '<=' ) && force_ssl_login() ) { // force_ssl_login deprecated WP 4.4.
			$ssl = true;
		} else if ( force_ssl_admin() ) {
			$ssl = true;
		}
		return $ssl;
	}

	/**
	 * This methods removes all of the registered css files on the frontend
	 * from Jetpack in favor of using a single file. In effect "imploding"
	 * all the files into one file.
	 *
	 * Pros:
	 * - Uses only ONE css asset connection instead of 15
	 * - Saves a minimum of 56k
	 * - Reduces server load
	 * - Reduces time to first painted byte
	 *
	 * Cons:
	 * - Loads css for ALL modules. However all selectors are prefixed so it
	 *		should not cause any issues with themes.
	 * - Plugins/themes dequeuing styles no longer do anything. See
	 *		jetpack_implode_frontend_css filter for a workaround
	 *
	 * For some situations developers may wish to disable css imploding and
	 * instead operate in legacy mode where each file loads seperately and
	 * can be edited individually or dequeued. This can be accomplished with
	 * the following line:
	 *
	 * add_filter( 'jetpack_implode_frontend_css', '__return_false' );
	 *
	 * @since 3.2
	 **/
	public function implode_frontend_css( $travis_test = false ) {
		$do_implode = true;
		if ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) {
			$do_implode = false;
		}

		/**
		 * Allow CSS to be concatenated into a single jetpack.css file.
		 *
		 * @since 3.2.0
		 *
		 * @param bool $do_implode Should CSS be concatenated? Default to true.
		 */
		$do_implode = apply_filters( 'jetpack_implode_frontend_css', $do_implode );

		// Do not use the imploded file when default behaviour was altered through the filter
		if ( ! $do_implode ) {
			return;
		}

		// We do not want to use the imploded file in dev mode, or if not connected
		if ( Jetpack::is_development_mode() || ! self::is_active() ) {
			if ( ! $travis_test ) {
				return;
			}
		}

		// Do not use the imploded file if sharing css was dequeued via the sharing settings screen
		if ( get_option( 'sharedaddy_disable_resources' ) ) {
			return;
		}

		/*
		 * Now we assume Jetpack is connected and able to serve the single
		 * file.
		 *
		 * In the future there will be a check here to serve the file locally
		 * or potentially from the Jetpack CDN
		 *
		 * For now:
		 * - Enqueue a single imploded css file
		 * - Zero out the style_loader_tag for the bundled ones
		 * - Be happy, drink scotch
		 */

		add_filter( 'style_loader_tag', array( $this, 'concat_remove_style_loader_tag' ), 10, 2 );

		$version = Jetpack::is_development_version() ? filemtime( JETPACK__PLUGIN_DIR . 'css/jetpack.css' ) : JETPACK__VERSION;

		wp_enqueue_style( 'jetpack_css', plugins_url( 'css/jetpack.css', __FILE__ ), array(), $version );
		wp_style_add_data( 'jetpack_css', 'rtl', 'replace' );
	}

	function concat_remove_style_loader_tag( $tag, $handle ) {
		if ( in_array( $handle, $this->concatenated_style_handles ) ) {
			$tag = '';
			if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) {
				$tag = "<!-- `" . esc_html( $handle ) . "` is included in the concatenated jetpack.css -->\r\n";
			}
		}

		return $tag;
	}

	/*
	 * Check the heartbeat data
	 *
	 * Organizes the heartbeat data by severity.  For example, if the site
	 * is in an ID crisis, it will be in the $filtered_data['bad'] array.
	 *
	 * Data will be added to "caution" array, if it either:
	 *  - Out of date Jetpack version
	 *  - Out of date WP version
	 *  - Out of date PHP version
	 *
	 * $return array $filtered_data
	 */
	public static function jetpack_check_heartbeat_data() {
		$raw_data = Jetpack_Heartbeat::generate_stats_array();

		$good    = array();
		$caution = array();
		$bad     = array();

		foreach ( $raw_data as $stat => $value ) {

			// Check jetpack version
			if ( 'version' == $stat ) {
				if ( version_compare( $value, JETPACK__VERSION, '<' ) ) {
					$caution[ $stat ] = $value . " - min supported is " . JETPACK__VERSION;
					continue;
				}
			}

			// Check WP version
			if ( 'wp-version' == $stat ) {
				if ( version_compare( $value, JETPACK__MINIMUM_WP_VERSION, '<' ) ) {
					$caution[ $stat ] = $value . " - min supported is " . JETPACK__MINIMUM_WP_VERSION;
					continue;
				}
			}

			// Check PHP version
			if ( 'php-version' == $stat ) {
				if ( version_compare( PHP_VERSION, '5.2.4', '<' ) ) {
					$caution[ $stat ] = $value . " - min supported is 5.2.4";
					continue;
				}
			}

			// Check ID crisis
			if ( 'identitycrisis' == $stat ) {
				if ( 'yes' == $value ) {
					$bad[ $stat ] = $value;
					continue;
				}
			}

			// The rest are good :)
			$good[ $stat ] = $value;
		}

		$filtered_data = array(
			'good'    => $good,
			'caution' => $caution,
			'bad'     => $bad
		);

		return $filtered_data;
	}


	/*
	 * This method is used to organize all options that can be reset
	 * without disconnecting Jetpack.
	 *
	 * It is used in class.jetpack-cli.php to reset options
	 *
	 * @return array of options to delete.
	 */
	public static function get_jetpack_options_for_reset() {
		$jetpack_options            = Jetpack_Options::get_option_names();
		$jetpack_options_non_compat = Jetpack_Options::get_option_names( 'non_compact' );
		$jetpack_options_private    = Jetpack_Options::get_option_names( 'private' );

		$all_jp_options = array_merge( $jetpack_options, $jetpack_options_non_compat, $jetpack_options_private );

		// A manual build of the wp options
		$wp_options = array(
			'sharing-options',
			'disabled_likes',
			'disabled_reblogs',
			'jetpack_comments_likes_enabled',
			'wp_mobile_excerpt',
			'wp_mobile_featured_images',
			'wp_mobile_app_promos',
			'stats_options',
			'stats_dashboard_widget',
			'safecss_preview_rev',
			'safecss_rev',
			'safecss_revision_migrated',
			'nova_menu_order',
			'jetpack_portfolio',
			'jetpack_portfolio_posts_per_page',
			'jetpack_testimonial',
			'jetpack_testimonial_posts_per_page',
			'wp_mobile_custom_css',
			'sharedaddy_disable_resources',
			'sharing-options',
			'sharing-services',
			'site_icon_temp_data',
			'featured-content',
			'site_logo',
		);

		// Flag some Jetpack options as unsafe
		$unsafe_options = array(
			'id',                           // (int)    The Client ID/WP.com Blog ID of this site.
			'master_user',                  // (int)    The local User ID of the user who connected this site to jetpack.wordpress.com.
			'version',                      // (string) Used during upgrade procedure to auto-activate new modules. version:time
			'jumpstart',                    // (string) A flag for whether or not to show the Jump Start.  Accepts: new_connection, jumpstart_activated, jetpack_action_taken, jumpstart_dismissed.

			// non_compact
			'activated',

			// private
			'register',
			'blog_token',                  // (string) The Client Secret/Blog Token of this site.
			'user_token',                  // (string) The User Token of this site. (deprecated)
			'user_tokens'
		);

		// Remove the unsafe Jetpack options
		foreach ( $unsafe_options as $unsafe_option ) {
			if ( false !== ( $key = array_search( $unsafe_option, $all_jp_options ) ) ) {
				unset( $all_jp_options[ $key ] );
			}
		}

		$options = array(
			'jp_options' => $all_jp_options,
			'wp_options' => $wp_options
		);

		return $options;
	}

	/*
	 * Check if an option of a Jetpack module has been updated.
	 *
	 * If any module option has been updated before Jump Start has been dismissed,
	 * update the 'jumpstart' option so we can hide Jump Start.
	 */
	public static function jumpstart_has_updated_module_option( $option_name = '' ) {
		// Bail if Jump Start has already been dismissed
		if ( 'new_connection' !== Jetpack::get_option( 'jumpstart' ) ) {
			return false;
		}

		$jetpack = Jetpack::init();


		// Manual build of module options
		$option_names = self::get_jetpack_options_for_reset();

		if ( in_array( $option_name, $option_names['wp_options'] ) ) {
			Jetpack_Options::update_option( 'jumpstart', 'jetpack_action_taken' );

			//Jump start is being dismissed send data to MC Stats
			$jetpack->stat( 'jumpstart', 'manual,'.$option_name );

			$jetpack->do_stats( 'server_side' );
		}

	}

	/*
	 * Strip http:// or https:// from a url, replaces forward slash with ::,
	 * so we can bring them directly to their site in calypso.
	 *
	 * @param string | url
	 * @return string | url without the guff
	 */
	public static function build_raw_urls( $url ) {
		$strip_http = '/.*?:\/\//i';
		$url = preg_replace( $strip_http, '', $url  );
		$url = str_replace( '/', '::', $url );
		return $url;
	}

	/**
	 * Stores and prints out domains to prefetch for page speed optimization.
	 *
	 * @param mixed $new_urls
	 */
	public static function dns_prefetch( $new_urls = null ) {
		static $prefetch_urls = array();
		if ( empty( $new_urls ) && ! empty( $prefetch_urls ) ) {
			echo "\r\n";
			foreach ( $prefetch_urls as $this_prefetch_url ) {
				printf( "<link rel='dns-prefetch' href='%s'>\r\n", esc_attr( $this_prefetch_url ) );
			}
		} elseif ( ! empty( $new_urls ) ) {
			if ( ! has_action( 'wp_head', array( __CLASS__, __FUNCTION__ ) ) ) {
				add_action( 'wp_head', array( __CLASS__, __FUNCTION__ ) );
			}
			foreach ( (array) $new_urls as $this_new_url ) {
				$prefetch_urls[] = strtolower( untrailingslashit( preg_replace( '#^https?://#i', '//', $this_new_url ) ) );
			}
			$prefetch_urls = array_unique( $prefetch_urls );
		}
	}

	public function wp_dashboard_setup() {
		if ( self::is_active() ) {
			add_action( 'jetpack_dashboard_widget', array( __CLASS__, 'dashboard_widget_footer' ), 999 );
			$widget_title = __( 'Site Stats', 'jetpack' );
		} elseif ( ! self::is_development_mode() && current_user_can( 'jetpack_connect' ) ) {
			add_action( 'jetpack_dashboard_widget', array( $this, 'dashboard_widget_connect_to_wpcom' ) );
			$widget_title = __( 'Please Connect Jetpack', 'jetpack' );
		}

		if ( has_action( 'jetpack_dashboard_widget' ) ) {
			wp_add_dashboard_widget(
				'jetpack_summary_widget',
				$widget_title,

The variable $widget_title does not seem to be defined for all execution paths leading up to this point.

				array( __CLASS__, 'dashboard_widget' )
			);
			wp_enqueue_style( 'jetpack-dashboard-widget', plugins_url( 'css/dashboard-widget.css', JETPACK__PLUGIN_FILE ), array(), JETPACK__VERSION );

			// If we're inactive and not in development mode, sort our box to the top.
			if ( ! self::is_active() && ! self::is_development_mode() ) {
				global $wp_meta_boxes;

				$dashboard = $wp_meta_boxes['dashboard']['normal']['core'];
				$ours      = array( 'jetpack_summary_widget' => $dashboard['jetpack_summary_widget'] );

				$wp_meta_boxes['dashboard']['normal']['core'] = array_merge( $ours, $dashboard );
			}
		}
	}

	/**
	 * @param mixed $result Value for the user's option

There is no parameter named $result. Was it maybe removed?

	 * @return mixed
	 */
	function get_user_option_meta_box_order_dashboard( $sorted ) {
		if ( ! is_array( $sorted ) ) {
			return $sorted;
		}

		foreach ( $sorted as $box_context => $ids ) {
			if ( false === strpos( $ids, 'dashboard_stats' ) ) {
				// If the old id isn't anywhere in the ids, don't bother exploding and fail out.
				continue;
			}

			$ids_array = explode( ',', $ids );
			$key = array_search( 'dashboard_stats', $ids_array );

			if ( false !== $key ) {
				// If we've found that exact value in the option (and not `google_dashboard_stats` for example)
				$ids_array[ $key ] = 'jetpack_summary_widget';
				$sorted[ $box_context ] = implode( ',', $ids_array );
				// We've found it, stop searching, and just return.
				break;
			}
		}

		return $sorted;
	}

	public static function dashboard_widget() {
		/**
		 * Fires when the dashboard is loaded.
		 *
		 * @since 3.4.0
		 */
		do_action( 'jetpack_dashboard_widget' );
	}

	public static function dashboard_widget_footer() {
		?>
		<footer>

		<div class="protect">
			<?php if ( Jetpack::is_module_active( 'protect' ) ) : ?>
				<h3><?php echo number_format_i18n( get_site_option( 'jetpack_protect_blocked_attempts', 0 ) ); ?></h3>
				<p><?php echo esc_html_x( 'Blocked malicious login attempts', '{#} Blocked malicious login attempts -- number is on a prior line, text is a caption.', 'jetpack' ); ?></p>
			<?php elseif ( current_user_can( 'jetpack_activate_modules' ) && ! self::is_development_mode() ) : ?>
				<a href="<?php echo esc_url( wp_nonce_url( Jetpack::admin_url( array( 'action' => 'activate', 'module' => 'protect' ) ), 'jetpack_activate-protect' ) ); ?>" class="button button-jetpack" title="<?php esc_attr_e( 'Protect helps to keep you secure from brute-force login attacks.', 'jetpack' ); ?>">
					<?php esc_html_e( 'Activate Protect', 'jetpack' ); ?>
				</a>
			<?php else : ?>
				<?php esc_html_e( 'Protect is inactive.', 'jetpack' ); ?>
			<?php endif; ?>
		</div>

		<div class="akismet">
			<?php if ( is_plugin_active( 'akismet/akismet.php' ) ) : ?>
				<h3><?php echo number_format_i18n( get_option( 'akismet_spam_count', 0 ) ); ?></h3>
				<p><?php echo esc_html_x( 'Spam comments blocked by Akismet.', '{#} Spam comments blocked by Akismet -- number is on a prior line, text is a caption.', 'jetpack' ); ?></p>
			<?php elseif ( current_user_can( 'activate_plugins' ) && ! is_wp_error( validate_plugin( 'akismet/akismet.php' ) ) ) : ?>
				<a href="<?php echo esc_url( wp_nonce_url( add_query_arg( array( 'action' => 'activate', 'plugin' => 'akismet/akismet.php' ), admin_url( 'plugins.php' ) ), 'activate-plugin_akismet/akismet.php' ) ); ?>" class="button button-jetpack">
					<?php esc_html_e( 'Activate Akismet', 'jetpack' ); ?>
				</a>
			<?php else : ?>
				<p><a href="<?php echo esc_url( 'https://akismet.com/?utm_source=jetpack&utm_medium=link&utm_campaign=Jetpack%20Dashboard%20Widget%20Footer%20Link' ); ?>"><?php esc_html_e( 'Akismet can help to keep your blog safe from spam!', 'jetpack' ); ?></a></p>
			<?php endif; ?>
		</div>


		<?php if ( ! current_user_can( 'edit_posts' ) && self::is_user_connected() ) : ?>
			<div style="width: 100%; text-align: center; padding-top: 20px; clear: both;"><a class="button" title="<?php esc_attr_e( 'Unlink your account from WordPress.com', 'jetpack' ); ?>" href="<?php echo esc_url( wp_nonce_url( add_query_arg( array( 'action' => 'unlink', 'redirect' => 'sub-unlink' ), admin_url( 'index.php' ) ), 'jetpack-unlink' ) ); ?>"><?php esc_html_e( 'Unlink your account from WordPress.com', 'jetpack' ); ?></a></div>
		<?php endif; ?>

		</footer>
		<?php
	}

	public function dashboard_widget_connect_to_wpcom() {
		if ( Jetpack::is_active() || Jetpack::is_development_mode() || ! current_user_can( 'jetpack_connect' ) ) {
			return;
		}
		?>
		<div class="wpcom-connect">
			<div class="jp-emblem">
			<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" id="Layer_1" x="0" y="0" viewBox="0 0 172.9 172.9" enable-background="new 0 0 172.9 172.9" xml:space="preserve">
				<path d="M86.4 0C38.7 0 0 38.7 0 86.4c0 47.7 38.7 86.4 86.4 86.4s86.4-38.7 86.4-86.4C172.9 38.7 134.2 0 86.4 0zM83.1 106.6l-27.1-6.9C49 98 45.7 90.1 49.3 84l33.8-58.5V106.6zM124.9 88.9l-33.8 58.5V66.3l27.1 6.9C125.1 74.9 128.4 82.8 124.9 88.9z"/>
			</svg>
			</div>
			<h3><?php esc_html_e( 'Please Connect Jetpack', 'jetpack' ); ?></h3>
			<p><?php echo wp_kses( __( 'Connecting Jetpack will show you <strong>stats</strong> about your traffic, <strong>protect</strong> you from brute force attacks, <strong>speed up</strong> your images and photos, and enable other <strong>traffic and security</strong> features.', 'jetpack' ), 'jetpack' ) ?></p>

			<div class="actions">
				<a href="<?php echo $this->build_connect_url() ?>" class="button button-primary">
					<?php esc_html_e( 'Connect Jetpack', 'jetpack' ); ?>
				</a>
			</div>
		</div>
		<?php
	}

	/*
	 * A graceful transition to using Core's site icon.
	 *
	 * All of the hard work has already been done with the image
	 * in all_done_page(). All that needs to be done now is update
	 * the option and display proper messaging.
	 *
	 * @todo remove when WP 4.3 is minimum

Comments for TODO tasks are often forgotten in the code; it might be better to use a dedicated issue tracker.

	 *
	 * @since 3.6.1
	 *
	 * @return bool false = Core's icon not available || true = Core's icon is available
	 */
	public static function jetpack_site_icon_available_in_core() {
		global $wp_version;
		$core_icon_available = function_exists( 'has_site_icon' ) && version_compare( $wp_version, '4.3-beta' ) >= 0;

		if ( ! $core_icon_available ) {
			return false;
		}

		// No need for Jetpack's site icon anymore if core's is already set
		if ( has_site_icon() ) {
			if ( Jetpack::is_module_active( 'site-icon' ) ) {
				Jetpack::log( 'deactivate', 'site-icon' );
				Jetpack::deactivate_module( 'site-icon' );
			}
			return true;
		}

		// Transfer Jetpack's site icon to use core.
		$site_icon_id = Jetpack::get_option( 'site_icon_id' );
		if ( $site_icon_id ) {
			// Update core's site icon
			update_option( 'site_icon', $site_icon_id );

			// Delete Jetpack's icon option. We still want the blavatar and attached data though.
			delete_option( 'site_icon_id' );
		}

		// No need for Jetpack's site icon anymore
		if ( Jetpack::is_module_active( 'site-icon' ) ) {
			Jetpack::log( 'deactivate', 'site-icon' );
			Jetpack::deactivate_module( 'site-icon' );
		}

		return true;
	}

}