Issues in class-sensei-frontend.php (master) - Issues in master - woothemes/sensei - Measure and Improve Code Quality continuously with Scrutinizer

Issues (896)

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Cross-Site Scripting
Cross-Site Scripting enables an attacker to inject code into the response of a web-request that is viewed by other users. It can for example be used to bypass access controls, or even to take over other users' accounts.
File Exposure
File Exposure allows an attacker to gain access to local files that he should not be able to access. These files can for example include database credentials, or other configuration files.
File Manipulation
File Manipulation enables an attacker to write custom data to files. This potentially leads to injection of arbitrary code on the server.
Object Injection
Object Injection enables an attacker to inject an object into PHP code, and can lead to arbitrary code execution, file exposure, or file manipulation attacks.
Code Injection
Code Injection enables an attacker to execute arbitrary code on the server.
Response Splitting
Response Splitting can be used to send arbitrary responses.
File Inclusion
File Inclusion enables an attacker to inject custom files into PHP's file loading mechanism, either explicitly passed to include, or for example via PHP's auto-loading mechanism.
Command Injection
Command Injection enables an attacker to inject a shell command that is execute with the privileges of the web-server. This can be used to expose sensitive data, or gain access of your server.
SQL Injection
SQL Injection enables an attacker to execute arbitrary SQL code on your database server gaining access to user data, or manipulating user data.
XPath Injection
XPath Injection enables an attacker to modify the parts of XML document that are read. If that XML document is for example used for authentication, this can lead to further vulnerabilities similar to SQL Injection.
LDAP Injection
LDAP Injection enables an attacker to inject LDAP statements potentially granting permission to run unauthorized queries, or modify content inside the LDAP tree.
Header Injection
Other Vulnerability
This category comprises other attack vectors such as manipulating the PHP runtime, loading custom extensions, freezing the runtime, or similar.
Regex Injection
Regex Injection enables an attacker to execute arbitrary code in your PHP process.
XML Injection
XML Injection enables an attacker to read files on your local filesystem including configuration files, or can be abused to freeze your web-server process.
Variable Injection
Variable Injection enables an attacker to overwrite program variables with custom data, and can lead to further vulnerabilities.
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includes/class-sensei-frontend.php (1 issue)

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<?php
if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

/**
 * Sensei Frontend Class
 *
 * All functionality pertaining to the frontend of Sensei.
 *
 * @package Core
 * @author Automattic
 *
 * @since 1.0.0
 */
class Sensei_Frontend {

	public $messages;
	public $data;

	/**
	 * Constructor.
	 * @since  1.0.0
	 */
	public function __construct () {

		// Template output actions
		add_action( 'sensei_before_main_content', array( $this, 'sensei_output_content_wrapper' ), 10 );
		add_action( 'sensei_after_main_content', array( $this, 'sensei_output_content_wrapper_end' ), 10 );
		add_action( 'sensei_lesson_archive_lesson_title', array( $this, 'sensei_lesson_archive_lesson_title' ), 10 );

		// 1.2.1
		add_action( 'wp_head', array( $this, 'sensei_complete_lesson' ), 10 );
		add_action( 'wp_head', array( $this, 'sensei_complete_course' ), 10 );
		add_action( 'sensei_frontend_messages', array( $this, 'sensei_frontend_messages' ) );
		add_action( 'sensei_lesson_video', array( $this, 'sensei_lesson_video' ), 10, 1 );
		add_action( 'sensei_complete_lesson_button', array( $this, 'sensei_complete_lesson_button' ) );
		add_action( 'sensei_reset_lesson_button', array( $this, 'sensei_reset_lesson_button' ) );

		add_action( 'sensei_course_archive_meta', array( $this, 'sensei_course_archive_meta' ) );

		add_action( 'sensei_lesson_tag_main_content', array( $this, 'sensei_lesson_archive_main_content' ), 10 );
		add_action( 'sensei_no_permissions_main_content', array( $this, 'sensei_no_permissions_main_content' ), 10 );

		add_action( 'sensei_lesson_meta', array( $this, 'sensei_lesson_meta' ), 10 );
		add_action( 'sensei_single_course_content_inside_before', array( $this, 'sensei_course_start' ), 10 );

		// add_filter( 'get_comments_number', array( $this, 'sensei_lesson_comment_count' ), 1 );
		add_filter( 'the_title', array( $this, 'sensei_lesson_preview_title' ), 10, 2 );

		//1.6.2
		add_filter( 'wp_login_failed', array( $this, 'sensei_login_fail_redirect' ), 10 );
		add_filter( 'init', array( $this, 'sensei_handle_login_request' ), 10 );
		//1.6.3
		add_action( 'init', array( $this, 'sensei_process_registration' ), 2 );
		//1.7.0
		add_action( 'sensei_pagination', array( $this, 'sensei_breadcrumb' ), 80, 1 );

		// Fix pagination for course archive pages when filtering by course type
		add_filter( 'pre_get_posts', array( $this, 'sensei_course_archive_pagination' ) );

		// Scripts and Styles
		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_styles' ) );
		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );

		// Custom Menu Item filters
		add_filter( 'wp_setup_nav_menu_item', array( $this, 'sensei_setup_nav_menu_item' ) );
		add_filter( 'wp_nav_menu_objects', array( $this, 'sensei_wp_nav_menu_objects' ) );
		// Search Results filters
		add_filter( 'post_class', array( $this, 'sensei_search_results_classes' ), 10 );
		// Only show course & lesson excerpts in search results
		add_filter( 'the_content', array( $this, 'sensei_search_results_excerpt' ) );

        //Use WooCommerce filter to show admin bar to Teachers.
        add_action( 'init', array( $this, 'sensei_show_admin_bar') );

        // Remove course from active courses if an order is cancelled or refunded
		add_action( 'woocommerce_order_status_processing_to_cancelled', array( $this, 'remove_active_course' ), 10, 1 );
		add_action( 'woocommerce_order_status_completed_to_cancelled', array( $this, 'remove_active_course' ), 10, 1 );
		add_action( 'woocommerce_order_status_on-hold_to_cancelled', array( $this, 'remove_active_course' ), 10, 1 );
		add_action( 'woocommerce_order_status_processing_to_refunded', array( $this, 'remove_active_course' ), 10, 1 );
		add_action( 'woocommerce_order_status_completed_to_refunded', array( $this, 'remove_active_course' ), 10, 1 );
		add_action( 'woocommerce_order_status_on-hold_to_refunded', array( $this, 'remove_active_course' ), 10, 1 );

		// Make sure correct courses are marked as active for users
		add_action( 'sensei_before_my_courses', array( $this, 'activate_purchased_courses' ), 10, 1 );
		add_action( 'sensei_single_course_content_inside_before', array( $this, 'activate_purchased_single_course' ), 10 );

		// Lesson tags
		add_action( 'sensei_lesson_meta_extra', array( $this, 'lesson_tags_display' ), 10, 1 );
		add_action( 'pre_get_posts', array( $this, 'lesson_tag_archive_filter' ), 10, 1 );
		add_filter( 'sensei_lessons_archive_text', array( $this, 'lesson_tag_archive_header' ) );
		add_action( 'sensei_loop_lesson_inside_before', array( $this, 'lesson_tag_archive_description' ), 11 );

		// Hide Sensei activity comments from lesson and course pages
		add_filter( 'wp_list_comments_args', array( $this, 'hide_sensei_activity' ) );
	} // End __construct()

	/**
	 * Graceful fallback for course and lesson variables on Frontend object
	 *
	 * @param string $key Key to get.
	 * @since  1.7.3
	 * @return array|mixed
	 */
	public function __get( $key ) {

		if ( 'lesson' == $key || 'course' == $key ) {
			if ( WP_DEBUG ) {
				trigger_error( sprintf( 'Sensei()->frontend->%1$s has been <strong>deprecated</strong> since version %2$s! Please use Sensei()->%1$s to access the instance.', $key, '1.7.3' ) );
			}
			return Sensei()->$key;
		}

		return null;
	}

	/**
	 * Enqueue frontend JavaScripts.
	 * @since  1.0.0
	 * @return void
	 */
	public function enqueue_scripts () {

		$disable_js = false;
		if ( isset( Sensei()->settings->settings[ 'js_disable' ] ) ) {
			$disable_js = Sensei()->settings->settings[ 'js_disable' ];
		} // End If Statement
		if ( ! $disable_js ) {

			$suffix = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ? '' : '.min';

			// My Courses tabs script
			wp_register_script( Sensei()->token . '-user-dashboard', esc_url( Sensei()->plugin_url . 'assets/js/user-dashboard' . $suffix . '.js' ), array( 'jquery-ui-tabs' ), Sensei()->version, true );
			wp_enqueue_script( Sensei()->token . '-user-dashboard' );


            // Course Archive javascript
            if( is_post_type_archive( 'course' ) ){

                wp_register_script( 'sensei-course-archive-js', esc_url( Sensei()->plugin_url . 'assets/js/frontend/course-archive' . $suffix . '.js' ), array( 'jquery' ), '1', true );
                wp_enqueue_script( 'sensei-course-archive-js' );

            }


			// Allow additional scripts to be loaded
			do_action( 'sensei_additional_scripts' );

		} // End If Statement

	} // End enqueue_scripts()

	/**
	 * Enqueue frontend CSS files.
	 * @since  1.0.0
	 * @return void
	 */
	public function enqueue_styles () {

		$disable_styles = false;
		if ( isset( Sensei()->settings->settings[ 'styles_disable' ] ) ) {
			$disable_styles = Sensei()->settings->settings[ 'styles_disable' ];
		} // End If Statement

		// Add filter for theme overrides
		$disable_styles = apply_filters( 'sensei_disable_styles', $disable_styles );

		if ( ! $disable_styles ) {

			wp_register_style( Sensei()->token . '-frontend', Sensei()->plugin_url . 'assets/css/frontend/sensei.css', '', Sensei()->version, 'screen' );
			wp_enqueue_style( Sensei()->token . '-frontend' );

			// Allow additional stylesheets to be loaded
			do_action( 'sensei_additional_styles' );

		} // End If Statement

	} // End enqueue_styles()


	/**
	 * sensei_get_template_part function.
	 *
     * @deprecated sine 1.9.0
	 * @access public
	 * @param mixed $slug
	 * @param string $name (default: '')
	 * @return void
	 */
	function sensei_get_template_part( $slug, $name = '' ) {

        _deprecated_function( 'class-woothemes-sensei-frontend.php', '1.9.0', 'Sensei_Templates::get_part' );
        Sensei_Templates::get_part( $slug, $name );

	} // End sensei_get_template_part()

	/**
	 * sensei_get_template function.
	 *
     * @deprecated since 1.9.0
	 * @access public
	 * @param mixed $template_name
	 * @param array $args (default: array())
	 * @param string $template_path (default: '')
	 * @param string $default_path (default: '')
	 * @return void
	 */
	function sensei_get_template( $template_name, $args = array(), $template_path = '', $default_path = '' ) {

        _deprecated_function( 'sensei_get_template', '1.9.0', 'Sensei_Templates::get_template' );
        Sensei_Templates::get_template($template_name, $args, $template_path, $default_path  );

	} // End sensei_get_template()


	/**
	 * sensei_locate_template function.
	 *
	 * @access public
	 * @param mixed $template_name
	 * @param string $template_path (default: '')
	 * @param string $default_path (default: '')
	 * @return void
	 */
	function sensei_locate_template( $template_name, $template_path = '', $default_path = '' ) {

        _deprecated_function( 'sensei_locate_template', '1.9.0', 'Sensei_Templates::locate_template' );
        Sensei_Templates::locate_template( $template_name, $template_path, $default_path );

	} // End sensei_locate_template()


	/**
	 * sensei_output_content_wrapper function.
     *
	 * @access public
	 * @return void
	 */
	function sensei_output_content_wrapper() {

	    // backwards compatibility check for old location under the wrappers directory of the active theme
        $backwards_compatible_wrapper_location =   array(
            Sensei()->template_url . 'wrappers/wrapper-start.php',
            'wrappers/wrapper-start.php'
        );

        $template = locate_template( $backwards_compatible_wrapper_location );
        if( !empty( $template ) ){

            Sensei_Templates::get_template( 'wrappers/wrapper-start.php' );
            return;

        }

		Sensei_Templates::get_template( 'globals/wrapper-start.php' );

	} // End sensei_output_content_wrapper()


	/**
	 * sensei_output_content_wrapper_end function.
     *
	 * @access public
	 * @return void
	 */
	function sensei_output_content_wrapper_end() {

	    // backwards compatibility check for old location under the wrappers directory of the active theme
        $backwards_compatible_wrapper_location =   array(
            Sensei()->template_url . 'wrappers/wrapper-end.php',
            'wrappers/wrapper-end.php'
        );

        $backwards_compatible_template = locate_template( $backwards_compatible_wrapper_location );
        if( !empty( $backwards_compatible_template ) ){

            Sensei_Templates::get_template( 'wrappers/wrapper-end.php' );
            return;

        }


		Sensei_Templates::get_template( 'globals/wrapper-end.php' );

	} // End sensei_output_content_wrapper_end()


	/**
	 * sensei_output_content_pagination function.
	 *
	 * @access public
	 * @return void
	 */
	public static function load_content_pagination() {

        if( is_singular('course') ) {

            // backwards compatibility check for old location under the wrappers directory of the active theme
            $template = locate_template( array( Sensei()->template_url . 'wrappers/pagination-posts.php' ) );
            if( !empty( $template ) ){

                Sensei_Templates::get_template( 'wrappers/pagination-posts.php' );
                return;

            }

			Sensei_Templates::get_template( 'globals/pagination-posts.php' );

		} elseif( is_singular('lesson') ) {

		    // backwards compatibility check for old location under the wrappers directory of the active theme
		    $template = locate_template( array( Sensei()->template_url . 'wrappers/pagination-lesson.php' ) );
            if( !empty( $template ) ){

                Sensei_Templates::get_template( 'wrappers/pagination-lesson.php' );
                return;

            }

			Sensei_Templates::get_template( 'globals/pagination-lesson.php' );

		} elseif( is_singular('quiz') ) {

		    // backwards compatibility check for old location under the wrappers directory of the active theme
		    $template = locate_template( array( Sensei()->template_url . 'wrappers/pagination-quiz.php' ) );
            if( !empty( $template ) ){

                Sensei_Templates::get_template( 'wrappers/pagination-quiz.php' );
                return;

            }

			Sensei_Templates::get_template( 'globals/pagination-quiz.php' );

		} else {

            // backwards compatibility check for old location under the wrappers directory of the active theme
            $template = locate_template( array( Sensei()->template_url . 'wrappers/pagination.php' ) );
            if( !empty( $template ) ){

                Sensei_Templates::get_template( 'wrappers/pagination.php' );
                return;

            }

			Sensei_Templates::get_template( 'globals/pagination.php' );

		} // End If Statement

	} // End sensei_output_content_pagination()

	/**
	 * outputs comments for the specified pages
	 * @deprecated
	 * @return void
	 */
	function sensei_output_comments() {

		Sensei_Lesson::output_comments();

	} // End sensei_output_comments()

	/**
	 * sensei_setup_nav_menu_item function.
	 *
	 * Generate the urls for Sensei custom menu items.
	 *
	 * @access public
	 * @param object $item
	 * @return object $item
	 */
	public function sensei_setup_nav_menu_item( $item ) {
		global $pagenow, $wp_rewrite;

		if( 'nav-menus.php' != $pagenow && !defined('DOING_AJAX') && isset( $item->url ) && 'custom' == $item->type ) {

			// Set up Sensei menu links
			$course_page_id = intval( Sensei()->settings->settings[ 'course_page' ] );
			$my_account_page_id = intval( Sensei()->settings->settings[ 'my_course_page' ] );

			$course_page_url = Sensei_Course::get_courses_page_url();
			$lesson_archive_url = get_post_type_archive_link( 'lesson' );
			$my_courses_url = get_permalink( $my_account_page_id );
			$my_messages_url = get_post_type_archive_link( 'sensei_message' );

			switch ( $item->url ) {
				case '#senseicourses':
					$item->url = $course_page_url;
					break;

				case '#senseilessons':
					$item->url = $lesson_archive_url;
					break;

				case '#senseimycourses':
					$item->url = $my_courses_url;
					break;

				case '#senseimymessages':
					$item->url = $my_messages_url;
                    // if no archive link exist for sensei_message
                    // set it back to the place holder
                    if( ! $item->url ){

                        $item->url = '#senseimymessages';

                    }
					break;

				case '#senseilearnerprofile':
					$item->url = esc_url( Sensei()->learner_profiles->get_permalink() );
					break;

				case '#senseiloginlogout':
						$logout_url = wp_logout_url( home_url() );
						// Login link links to the My Courses page, to avoid the WP dashboard.
						$login_url = $my_courses_url;

						$item->url = ( is_user_logged_in() ? $logout_url : $login_url );

						// determine the menu title login or logout
						if ( is_user_logged_in() ) {
							$menu_title =  __( 'Logout'  ,'woothemes-sensei');
						} else {
							$menu_title =  __( 'Login'  ,'woothemes-sensei');
						}

						/**
						 * Action Filter: login/logout menu title
						 *
						 * With this filter you can alter the login / login menu item title string
						 *
						 * @param $menu_title
						 */
						$item->title = apply_filters( 'sensei_login_logout_menu_title', $menu_title );

					break;

				default:
					break;
			}

			$_root_relative_current = untrailingslashit( $_SERVER['REQUEST_URI'] );
			$current_url = set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_root_relative_current );
			$item_url = untrailingslashit( $item->url );
			$_indexless_current = untrailingslashit( preg_replace( '/' . preg_quote( $wp_rewrite->index, '/' ) . '$/', '', $current_url ) );
			// Highlight current menu item
			if ( $item_url && in_array( $item_url, array( $current_url, $_indexless_current, $_root_relative_current ) ) ) {
				$item->classes[] = 'current-menu-item current_page_item';
			}

		} // endif nav

		return $item;

	} // End sensei_setup_nav_menu_item()

	/**
	 * sensei_wp_nav_menu_objects function.
	 *
	 * Remove Sensei custom menu items depending on settings and logged in status.
	 *
	 * @access public
	 * @param object $sorted_menu_items
	 * @return object $sorted_menu_items
	 */
	public function sensei_wp_nav_menu_objects( $sorted_menu_items ) {

		foreach( $sorted_menu_items as $k=>$item ) {

			// Remove the My Messages link for logged out users or if Private Messages are disabled
			if( ! get_post_type_archive_link( 'sensei_message' )
                && '#senseimymessages' == $item->url ) {

				if ( !is_user_logged_in() || ( isset( Sensei()->settings->settings['messages_disable'] ) && Sensei()->settings->settings['messages_disable'] ) ) {

					unset( $sorted_menu_items[$k] );

				}
			}
			// Remove the My Profile link for logged out users.
			if( Sensei()->learner_profiles->get_permalink() == $item->url ) {

				if ( !is_user_logged_in() || ! ( isset( Sensei()->settings->settings[ 'learner_profile_enable' ] ) && Sensei()->settings->settings[ 'learner_profile_enable' ] ) ) {

					unset( $sorted_menu_items[$k] );

				}
			}
		}
		return $sorted_menu_items;
	} // End sensei_wp_nav_menu_objects

	// add category nicenames in body and post class
	function sensei_search_results_classes($classes) {
	    global $post;
	    // Handle Search Classes for Courses, Lessons, and WC Products
	    if ( isset( $post->post_type ) && ( ( 'course' == $post->post_type ) || ( 'lesson' == $post->post_type ) || ( 'product' == $post->post_type ) ) ) {
	    	$classes[] = 'post';
		} // End If Statement
	    return $classes;
	} // End sensei_search_results_classes()

    /**
     * sensei_single_title output for single page title
     * @since  1.1.0
     * @return void
     * @deprecated
     */
    function the_single_title() {

        _deprecated_function(' WooThemes_Sensei_Frontend::the_single_title', '1.9.0');

    } // End sensei_single_title()

	/**
	 * sensei_course_image output for course image Please use Sensei()->course->course_image instead.
     *
     * @deprecated since 1.9.0
     * @param $course_id
     * @param string $width
     * @param string $height
     * @param bool|false $return
     * @return string|void
	 */
	function sensei_course_image( $course_id, $width = '100', $height = '100', $return = false ) {

    	if ( ! $return ) {

			echo Sensei()->course->course_image( $course_id, $width, $height );
            return '';

		} // End If Statement

		return Sensei()->course->course_image( $course_id, $width, $height );

	} // End sensei_course_image()

	/**
	 * sensei_lesson_image output for lesson image
	 * @since  1.2.0
     * @deprecated since 1.9.0
     * @param $lesson_id
     * @param string $width
     * @param string $height
     * @param bool|false $return
     * @param bool|false $widget
     * @return string
	 */
	function sensei_lesson_image( $lesson_id, $width = '100', $height = '100', $return = false, $widget = false ) {

        if( ! $return ){

            echo Sensei()->lesson->lesson_image( $lesson_id, $width, $height, $widget );
            return '';
        }

        return Sensei()->lesson->lesson_image( $lesson_id, $width, $height, $widget );

	} // End sensei_lesson_image()

    /**
     * @since 1.0.0
     * @param WP_Query $query
     */
    function sensei_course_archive_pagination( $query ) {

		if( ! is_admin() && $query->is_main_query() && isset( $_GET['action'] ) && in_array( $_GET['action'], array( 'newcourses', 'featuredcourses', 'freecourses', 'paidcourses' ) ) ) {

			$amount = 0;
			if ( isset( Sensei()->settings->settings[ 'course_archive_amount' ] ) && ( 0 < absint( Sensei()->settings->settings[ 'course_archive_amount' ] ) ) ) {
				$amount = absint( Sensei()->settings->settings[ 'course_archive_amount' ] );
			}

			if( $amount ) {
				$query->set( 'posts_per_page', $amount );
			}

			$query->set( 'orderby', 'menu_order date' );

		}
	}

	/**
	 * sensei_course_archive_header function.
	 *
	 * @access public
	 * @since  1.2.0
     * @deprecated since 1.9.0 use WooThemes_Sensei_Course::archive_header
	 * @return void
	 */
	function sensei_course_archive_header(  ) {

        trigger_error('This function sensei_course_archive_header has been depricated. Please use: WooThemes_Sensei_Course::course_archive_header ');
        WooThemes_Sensei_Course::archive_header( '', '<header class="archive-header"><h1>', '</h1></header>' );

	} // sensei_course_archive_header()

	/**
	 * sensei_lesson_archive_header function.
	 *
     * @deprecated since 1.9.0
	 * @access public
	 * @since  1.2.1
	 * @return void
	 */
	public function sensei_lesson_archive_header( ) {
        _deprecated_function( 'WooThemes_Sensei_Frontend::sensei_lesson_archive_header', '1.9.0', 'WooThemes_Sensei_Lesson::the_archive_header' );
        Sensei()->lesson->the_archive_header();
	} // sensei_course_archive_header()

    /**
     * @deprecated since 1.9.0
     */
	public function sensei_message_archive_header( ){
        _deprecated_function('Sensei_Frontend::sensei_message_archive_header','Please use: Sense');
        Sensei_Messages::the_archive_header();
	} // sensei_message_archive_header()

	/**
	 * sensei_course_archive_course_title output for course archive page individual course title
	 * @since  1.2.0
     * @param WP_Post $post_item
	 * @return void
	 */
	function sensei_course_archive_course_title( $post_item ) {
		if ( isset( $post_item->ID ) && ( 0 < $post_item->ID ) ) {
			$post_id = absint( $post_item->ID );
    		$post_title = $post_item->post_title;
		} else {
			$post_id = get_the_ID();
    		$post_title = get_the_title();
		} // End If Statement
		?><header><h2><a href="<?php echo get_permalink( $post_id ); ?>" title="<?php echo esc_attr( $post_title ); ?>"><?php echo $post_title; ?></a></h2></header><?php
	} // End sensei_course_archive_course_title()

	/**
	 * sensei_lesson_archive_lesson_title output for course archive page individual course title
	 * @since  1.2.1
	 * @return void
	 */
	public function sensei_lesson_archive_lesson_title() {
		$post_id = get_the_ID();
    	$post_title = get_the_title();
		?><header><h2><a href="<?php echo get_permalink( $post_id ); ?>" title="<?php echo esc_attr( $post_title ); ?>"><?php echo $post_title; ?></a></h2></header><?php
	} // End sensei_lesson_archive_lesson_title()

	/**
	 * sensei_breadcrumb outputs Sensei breadcrumb trail on lesson & quiz pages
	 * @since  1.7.0
	 * @param  integer $id course, lesson or quiz id
	 * @return void
	 */
	public function sensei_breadcrumb( $id = 0 ) {

		// Only output on lesson, quiz and taxonomy (module) pages
		if( ! ( is_tax( 'module' ) || is_singular( 'lesson' ) || is_singular( 'quiz' ) ) ) return;

		if( empty( $id )  ){

            $id = get_the_ID();

        }

		$sensei_breadcrumb_prefix = __( 'Back to: ', 'woothemes-sensei' );
		$separator = apply_filters( 'sensei_breadcrumb_separator', '&gt;' );

		$html = '<section class="sensei-breadcrumb">' . $sensei_breadcrumb_prefix;
		// Lesson
		if ( is_singular( 'lesson' ) && 0 < intval( $id ) ) {
			$course_id = intval( get_post_meta( $id, '_lesson_course', true ) );
			if( ! $course_id ) {
				return;
			}
			$html .= '<a href="' . esc_url( get_permalink( $course_id ) ) . '" title="' . __( 'Back to the course', 'woothemes-sensei' ) . '">' . get_the_title( $course_id ) . '</a>';
    	} // End If Statement
    	// Quiz
		if ( is_singular( 'quiz' ) && 0 < intval( $id ) ) {
			$lesson_id = intval( get_post_meta( $id, '_quiz_lesson', true ) );
			if( ! $lesson_id ) {
				return;
			}
			 $html .= '<a href="' . esc_url( get_permalink( $lesson_id ) ) . '" title="' .  __( 'Back to the lesson', 'woothemes-sensei' ) . '">' . get_the_title( $lesson_id ) . '</a>';
    	} // End If Statement

    	// Allow other plugins to filter html
    	$html = apply_filters ( 'sensei_breadcrumb_output', $html, $separator );
    	$html .= '</section>';

    	echo $html;
	} // End sensei_breadcrumb()


    /**
     * @deprecated since 1.9.0 use WooThemes_Sensei_Lesson::course_signup_link instead
     */
	public function sensei_lesson_course_signup_link( ) {

        _deprecated_function('sensei_lesson_course_signup_link', '1.9.0', 'WooThemes_Sensei_Lesson::course_signup_link' );
        WooThemes_Sensei_Lesson::course_signup_link();
	}

	public function lesson_tags_display( $lesson_id = 0 ) {
		if( $lesson_id ) {
			$tags = wp_get_post_terms( $lesson_id, 'lesson-tag' );
			if( $tags && count( $tags ) > 0 ) {
				$tag_list = '';
				foreach( $tags as $tag ) {
					$tag_link = get_term_link( $tag, 'lesson-tag' );
					if( ! is_wp_error( $tag_link ) ) {
						if( $tag_list ) { $tag_list .= ', '; }
						$tag_list .= '<a href="' . $tag_link . '">' . $tag->name . '</a>';
					}
				}
				if( $tag_list ) {
					?><section class="lesson-tags">
		    			<?php printf( __( 'Lesson tags: %1$s', 'woothemes-sensei' ), $tag_list ); ?>
		    		</section><?php
		    	}
	    	}
		}
	}

    /**
     * @param WP_Query $query
     */
	public function lesson_tag_archive_filter( $query ) {
    	if( is_tax( 'lesson-tag' ) && $query->is_main_query() ) {
    		// Limit to lessons only
    		$query->set( 'post_type', 'lesson' );

    		// Set order of lessons
    		$query->set( 'orderby', 'menu_order' );
    		$query->set( 'order', 'ASC' );

    	}
    }

    public function lesson_tag_archive_header( $title ) {
		if( is_tax( 'lesson-tag' ) ) {
			$title = sprintf( __( 'Lesson tag: %1$s', 'woothemes-sensei' ), apply_filters( 'sensei_lesson_tag_archive_title', get_queried_object()->name ) );
		}
		return $title;
	}

	public function lesson_tag_archive_description() {
		if( is_tax( 'lesson-tag' ) ) {
			$tag = get_queried_object();
			echo '<p class="archive-description lesson-description">' . apply_filters( 'sensei_lesson_tag_archive_description', nl2br( $tag->description ), $tag->term_id ) . '</p>';
		}
	}

	public function sensei_complete_lesson() {
		global $post,  $current_user;
		// Handle Quiz Completion
		if ( isset( $_POST['quiz_action'] ) && wp_verify_nonce( $_POST[ 'woothemes_sensei_complete_lesson_noonce' ], 'woothemes_sensei_complete_lesson_noonce' ) ) {

			$sanitized_submit = esc_html( $_POST['quiz_action'] );

			switch ($sanitized_submit) {
                case 'lesson-complete':

					Sensei_Utils::sensei_start_lesson( $post->ID, $current_user->ID, $complete = true );

					break;

                case 'lesson-reset':

					Sensei_Utils::sensei_remove_user_from_lesson( $post->ID, $current_user->ID );

					$this->messages = '<div class="sensei-message note">' .  __( 'Lesson Reset Successfully.', 'woothemes-sensei' ) . '</div>';
					break;

				default:
					// Nothing
					break;

			} // End Switch Statement

		} // End If Statement

	} // End sensei_complete_lesson()

	public function sensei_complete_course() {
		global $post,  $current_user, $wp_query;
		if ( isset( $_POST['course_complete'] ) && wp_verify_nonce( $_POST[ 'woothemes_sensei_complete_course_noonce' ], 'woothemes_sensei_complete_course_noonce' ) ) {

			$sanitized_submit = esc_html( $_POST['course_complete'] );
			$sanitized_course_id = absint( esc_html( $_POST['course_complete_id'] ) );
			// Handle submit data
			switch ($sanitized_submit) {
				case __( 'Mark as Complete', 'woothemes-sensei' ):

					// Add user to course
					$course_metadata = array(
						'start' => current_time('mysql'),
						'percent' => 0, // No completed lessons yet
						'complete' => 0,
					);
					$activity_logged = Sensei_Utils::update_course_status( $current_user->ID, $sanitized_course_id, 'in-progress', $course_metadata );

					if ( $activity_logged ) {
						// Get all course lessons
						$course_lesson_ids = Sensei()->course->course_lessons( $sanitized_course_id, 'any', 'ids' );
						// Mark all quiz user meta lessons as complete
						foreach ( $course_lesson_ids as $lesson_item_id ){
							// Mark lesson as complete
							$activity_logged = Sensei_Utils::sensei_start_lesson( $lesson_item_id, $current_user->ID, $complete = true );
						} // End For Loop

						// Update with final stats
						$course_metadata = array(
							'percent' => 100,
							'complete' => count($course_lesson_ids),
						);
						$activity_logged = Sensei_Utils::update_course_status( $current_user->ID, $sanitized_course_id, 'complete', $course_metadata );

						do_action( 'sensei_user_course_end', $current_user->ID, $sanitized_course_id );

						// Success message
						$this->messages = '<header class="archive-header"><div class="sensei-message tick">' . sprintf( __( '%1$s marked as complete.', 'woothemes-sensei' ), get_the_title( $sanitized_course_id ) ) . '</div></header>';
					} // End If Statement

					break;

				case __( 'Delete Course', 'woothemes-sensei' ):

					Sensei_Utils::sensei_remove_user_from_course( $sanitized_course_id, $current_user->ID );

					// Success message
					$this->messages = '<header class="archive-header"><div class="sensei-message tick">' . sprintf( __( '%1$s deleted.', 'woothemes-sensei' ), get_the_title( $sanitized_course_id ) ) . '</div></header>';
					break;

				default:
					// Nothing
					break;
			} // End Switch Statement

		} // End If Statement
	} // End sensei_complete_course()

	/**
	 * @deprecated use WooThemes_Sensei_Quiz::get_user_answers
	 * @param int $lesson_id
	 * @return array
	 */
	public function sensei_get_user_quiz_answers( $lesson_id = 0 ) {
		global $current_user;

		$user_answers = array();

		if ( 0 < intval( $lesson_id ) ) {
			$lesson_quiz_questions = Sensei()->lesson->lesson_quiz_questions( $lesson_id );
			foreach( $lesson_quiz_questions as $question ) {
				$answer = maybe_unserialize( base64_decode( Sensei_Utils::sensei_get_activity_value( array( 'post_id' => $question->ID, 'user_id' => $current_user->ID, 'type' => 'sensei_user_answer', 'field' => 'comment_content' ) ) ) );
				$user_answers[ $question->ID ] = $answer;
			}
		}

		return $user_answers;
	} // End sensei_get_user_quiz_answers()

	public function sensei_has_user_completed_lesson( $post_id = 0, $user_id = 0 ) {
		_deprecated_function( __FUNCTION__, '1.7', "WooThemes_Sensei_Utils::user_completed_lesson()" );
		return Sensei_Utils::user_completed_lesson( $post_id, $user_id );
	} // End sensei_has_user_completed_lesson()

/**
*
 */
	public function sensei_frontend_messages() {
		Sensei()->notices->maybe_print_notices();
	} // End sensei_frontend_messages()

	public function sensei_lesson_video( $post_id = 0 ) {
		if ( 0 < intval( $post_id ) ) {
			$lesson_video_embed = get_post_meta( $post_id, '_lesson_video_embed', true );
			if ( 'http' == substr( $lesson_video_embed, 0, 4) ) {
        		// V2 - make width and height a setting for video embed
        		$lesson_video_embed = wp_oembed_get( esc_url( $lesson_video_embed )/*, array( 'width' => 100 , 'height' => 100)*/ );
        	} // End If Statement
        	if ( '' != $lesson_video_embed ) {
        	?><div class="video"><?php echo html_entity_decode($lesson_video_embed); ?></div><?php
        	} // End If Statement
        } // End If Statement
	} // End sensei_lesson_video()

	public function sensei_complete_lesson_button() {
		global  $post;

		$quiz_id = 0;

		//make sure user is taking course
		$course_id = Sensei()->lesson->get_course_id( $post->ID );
		if( ! Sensei_Utils::user_started_course( $course_id, get_current_user_id() ) ){
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
			return;
		}

		// Lesson quizzes
		$quiz_id = Sensei()->lesson->lesson_quizzes( $post->ID );
		$pass_required = true;
		if( $quiz_id ) {
			// Get quiz pass setting
	    	$pass_required = get_post_meta( $quiz_id, '_pass_required', true );
	    }
		if( ! $quiz_id || ( $quiz_id && ! $pass_required ) ) {
			?>
			<form class="lesson_button_form" method="POST" action="<?php echo esc_url( get_permalink() ); ?>">
	            <input type="hidden"
                       name="woothemes_sensei_complete_lesson_noonce"
                       id="woothemes_sensei_complete_lesson_noonce"
                       value="<?php echo esc_attr( wp_create_nonce( 'woothemes_sensei_complete_lesson_noonce' ) ); ?>"
                />

	            <input type="hidden" name="quiz_action" value="lesson-complete" />

                <input type="submit"
                       name="quiz_complete"
                       class="quiz-submit complete"
                       value="<?php _e( 'Complete Lesson', 'woothemes-sensei' ); ?>"/>

	        </form>
			<?php
		} // End If Statement
	} // End sensei_complete_lesson_button()

	public function sensei_reset_lesson_button() {
		global  $post;

		$quiz_id = 0;

		// Lesson quizzes
		$quiz_id = Sensei()->lesson->lesson_quizzes( $post->ID );
		$reset_allowed = true;
		if( $quiz_id ) {
			// Get quiz pass setting
			$reset_allowed = get_post_meta( $quiz_id, '_enable_quiz_reset', true );
		}
		if ( ! $quiz_id || !empty($reset_allowed) ) {
		?>
		<form method="POST" action="<?php echo esc_url( get_permalink() ); ?>">

            <input
            type="hidden"
            name="<?php echo esc_attr( 'woothemes_sensei_complete_lesson_noonce' ); ?>"
            id="<?php echo esc_attr( 'woothemes_sensei_complete_lesson_noonce' ); ?>"
            value="<?php echo esc_attr( wp_create_nonce( 'woothemes_sensei_complete_lesson_noonce' ) ); ?>" />

            <input type="hidden" name="quiz_action" value="lesson-reset" />

            <input type="submit" name="quiz_complete" class="quiz-submit reset" value="<?php _e( 'Reset Lesson', 'woothemes-sensei' ); ?>"/>

        </form>
		<?php
		} // End If Statement
	} // End sensei_reset_lesson_button()

    /**
     * @deprecated since 1.9.0
     */
    public function sensei_lesson_quiz_meta( ) {

        Sensei_Lesson::footer_quiz_call_to_action();

	} // End sensei_lesson_quiz_meta()

	public function sensei_course_archive_meta() {
		global  $post;
		// Meta data
		$post_id = get_the_ID();
		$post_title = get_the_title();
		$author_display_name = get_the_author();
		$author_id = get_the_author_meta('ID');
		$category_output = get_the_term_list( $post_id, 'course-category', '', ', ', '' );
		$free_lesson_count = intval( Sensei()->course->course_lesson_preview_count( $post_id ) );
		?><section class="entry">
        	<p class="sensei-course-meta">
           	<?php if ( isset( Sensei()->settings->settings[ 'course_author' ] ) && ( Sensei()->settings->settings[ 'course_author' ] ) ) { ?>
		   	<span class="course-author"><?php _e( 'by ', 'woothemes-sensei' ); ?><?php the_author_link(); ?></span>
		   	<?php } // End If Statement ?>
		   	<span class="course-lesson-count"><?php echo Sensei()->course->course_lesson_count( $post_id ) . '&nbsp;' . __( 'Lessons', 'woothemes-sensei' ); ?></span>
		   	<?php if ( '' != $category_output ) { ?>
		   	<span class="course-category"><?php echo sprintf( __( 'in %s', 'woothemes-sensei' ), $category_output ); ?></span>
		   	<?php } // End If Statement ?>
		   	<?php sensei_simple_course_price( $post_id ); ?>
        	</p>
        	<p class="course-excerpt"><?php the_excerpt(); ?></p>
        	<?php if ( 0 < $free_lesson_count ) {
                $free_lessons = sprintf( __( 'You can access %d of this course\'s lessons for free', 'woothemes-sensei' ), $free_lesson_count ); ?>
                <p class="sensei-free-lessons"><a href="<?php echo get_permalink( $post_id ); ?>"><?php _e( 'Preview this course', 'woothemes-sensei' ) ?></a> - <?php echo $free_lessons; ?></p>
            <?php } ?>
		</section><?php
	} // End sensei_course_archive_meta()

    /**
     * @deprecated since 1.9.0
     */
	public function sensei_single_main_content() {
	    _deprecated_function('Woothemes_Sensei_Frontend::sensei_single_main_content', '1.9.0');
	} // End sensei_single_main_content()

    /**
    * @deprecated since 1.9.0
    */
	public function sensei_lesson_archive_main_content() {
        _deprecated_function('Sensei_Frontend::sensei_lesson_archive_main_content', '1.9.0', 'Please include loop-lesson.php directly');
	} // End sensei_lesson_archive_main_content()

    /**
    * @deprecated since 1.9.0
    */
	public function sensei_message_archive_main_content() {
		_deprecated_function( 'Sensei_Frontend::sensei_message_archive_main_content', 'This method is no longer needed' );
	} // End sensei_lesson_archive_main_content()

    /**
    * @deprecated since 1.9.0
    */
	public function sensei_no_permissions_main_content() {
        _deprecated_function( 'Sensei_Frontend::sensei_no_permissions_main_content', 'This method is no longer needed' );
	} // End sensei_no_permissions_main_content()

	public function sensei_course_category_main_content() {
		global $post;
		if ( have_posts() ) { ?>

			<section id="main-course" class="course-container">

                <?php do_action( 'sensei_course_archive_header' ); ?>

                <?php while ( have_posts() ) { the_post(); ?>

                    <article class="<?php echo join( ' ', get_post_class( array( 'course', 'post' ), get_the_ID() ) ); ?>">

	    			    <?php sensei_do_deprecated_action('sensei_course_image','1.9.0', 'sensei_single_course_content_inside_before', get_the_ID() ); ?>

	    			    <?php sensei_do_deprecated_action( 'sensei_course_archive_course_title','1.9.0','sensei_course_content_inside_before', $post ); ?>

	    			    <?php do_action( 'sensei_course_archive_meta' ); ?>

	    		    </article>

                <?php } // End While Loop ?>

	    	</section>

		<?php } else { ?>

			<p>

                <?php _e( 'No courses found that match your selection.', 'woothemes-sensei' ); ?>

            </p>

		<?php } // End If Statement

	} // End sensei_course_category_main_content()

	public function sensei_login_form() {
		?>
		<div id="my-courses">
			<?php Sensei()->notices->maybe_print_notices(); ?>
			<div class="col2-set" id="customer_login">

				<div class="col-1">
					<?php
					// output the actual form markup
                    Sensei_Templates::get_template( 'user/login-form.php');
					?>
				</div>

			<?php
			if ( get_option('users_can_register') ) {

				// get current url
				$action_url = get_permalink();

				?>

				<div class="col-2">
					<h2><?php _e( 'Register', 'woothemes-sensei' ); ?></h2>

					<form method="post" class="register"  action="<?php echo esc_url( $action_url ); ?>" >

						<?php do_action( 'sensei_register_form_start' ); ?>

						<p class="form-row form-row-wide">
							<label for="sensei_reg_username"><?php _e( 'Username', 'woothemes-sensei' ); ?> <span class="required">*</span></label>
							<input type="text" class="input-text" name="sensei_reg_username" id="sensei_reg_username" value="<?php if ( ! empty( $_POST['sensei_reg_username'] ) ) esc_attr_e( $_POST['sensei_reg_username'] ); ?>" />
						</p>

						<p class="form-row form-row-wide">
							<label for="sensei_reg_email"><?php _e( 'Email address', 'woothemes-sensei' ); ?> <span class="required">*</span></label>
							<input type="email" class="input-text" name="sensei_reg_email" id="sensei_reg_email" value="<?php if ( ! empty( $_POST['sensei_reg_email'] ) ) esc_attr_e( $_POST['sensei_reg_email'] ); ?>" />
						</p>

						<p class="form-row form-row-wide">
							<label for="sensei_reg_password"><?php _e( 'Password', 'woothemes-sensei' ); ?> <span class="required">*</span></label>
							<input type="password" class="input-text" name="sensei_reg_password" id="sensei_reg_password" value="<?php if ( ! empty( $_POST['sensei_reg_password'] ) ) esc_attr_e( $_POST['sensei_reg_password'] ); ?>" />
						</p>

						<!-- Spam Trap -->
						<div style="left:-999em; position:absolute;"><label for="trap"><?php _e( 'Anti-spam', 'woothemes-sensei' ); ?></label><input type="text" name="email_2" id="trap" tabindex="-1" /></div>

						<?php do_action( 'sensei_register_form_fields' ); ?>
						<?php do_action( 'register_form' ); ?>

						<p class="form-row">
							<input type="submit" class="button" name="register" value="<?php _e( 'Register', 'woothemes-sensei' ); ?>" />
						</p>

						<?php do_action( 'sensei_register_form_end' ); ?>

					</form>
				</div>
				<?php
			}
			?>
			</div>
		</div>

		<?php
	} // End sensei_login_form()

	public function sensei_lesson_meta( $post_id = 0 ) {
		global $post;
		if ( 0 < intval( $post_id ) ) {
		$lesson_course_id = absint( get_post_meta( $post_id, '_lesson_course', true ) );
		?><section class="entry">
            <p class="sensei-course-meta">
			    <?php if ( isset( Sensei()->settings->settings[ 'lesson_author' ] ) && ( Sensei()->settings->settings[ 'lesson_author' ] ) ) { ?>
			    <span class="course-author"><?php _e( 'by ', 'woothemes-sensei' ); ?><?php the_author_link(); ?></span>
			    <?php } ?>
                <?php if ( 0 < intval( $lesson_course_id ) ) { ?>
                <span class="lesson-course"><?php echo '&nbsp;' . sprintf( __( 'Part of: %s', 'woothemes-sensei' ), '<a href="' . esc_url( get_permalink( $lesson_course_id ) ) . '" title="' . __( 'View course', 'woothemes-sensei' ) . '"><em>' . get_the_title( $lesson_course_id ) . '</em></a>' ); ?></span>
                <?php } ?>
            </p>
            <p class="lesson-excerpt"><?php the_excerpt( ); ?></p>
		</section><?php
		} // End If Statement
	} // sensei_lesson_meta()

	public function sensei_lesson_preview_title_text( $course_id ) {

		$preview_text = __( ' (Preview)', 'woothemes-sensei' );

		//if this is a paid course
		if ( Sensei_WC::is_woocommerce_active() ) {
    	    $wc_post_id = get_post_meta( $course_id, '_course_woocommerce_product', true );
    	    if ( 0 < $wc_post_id ) {
    	    	$preview_text = __( ' (Free Preview)', 'woothemes-sensei' );
    	    } // End If Statement
    	}
    	return $preview_text;
	}

	public function sensei_lesson_preview_title( $title = '', $id = 0 ) {
		global $post, $current_user;

		// Limit to lessons and check if lesson ID matches filtered post ID
		// @see https://github.com/woothemes/sensei/issues/574
		if( isset( $post->ID ) && $id == $post->ID && 'lesson' == get_post_type( $post ) ) {

			// Limit to main query only
			if( is_main_query() ) {

				// Get the course ID
				$course_id = get_post_meta( $post->ID, '_lesson_course', true );

				// Check if the user is taking the course
				if( is_singular( 'lesson' ) && Sensei_Utils::is_preview_lesson( $post->ID ) && ! Sensei_Utils::user_started_course( $course_id, $current_user->ID ) && $post->ID == $id ) {
					$title .= ' ' . $this->sensei_lesson_preview_title_text( $course_id );
				}
			}
		}
		return $title;
	} // sensei_lesson_preview_title

	public function sensei_course_start() {
		global $post, $current_user;

		// Check if the user is taking the course
		$is_user_taking_course = Sensei_Utils::user_started_course( $post->ID, $current_user->ID );
		// Handle user starting the course
		if ( isset( $_POST['course_start'] )
		    && wp_verify_nonce( $_POST[ 'woothemes_sensei_start_course_noonce' ], 'woothemes_sensei_start_course_noonce' )
		    && !$is_user_taking_course ) {

			// Start the course
			$activity_logged = Sensei_Utils::user_start_course( $current_user->ID, $post->ID );
			$this->data = new stdClass();
			$this->data->is_user_taking_course = false;
			if ( $activity_logged ) {
				$this->data->is_user_taking_course = true;

				// Refresh page to avoid re-posting
				?>

			    <script type="text/javascript"> window.location = '<?php echo get_permalink( $post->ID ); ?>'; </script>

			    <?php
			} // End If Statement
		} // End If Statement
	} // End sensei_course_start()

    /**
     * @deprecated since 1.9.0
     */
	public function sensei_course_meta() {
        _deprecated_function( 'Sensei_Frontend::sensei_course_meta', '1.9.0' , 'Sensei_Course::the_course_meta()' );
        Sensei()->course->the_course_meta( get_post() );
	} // End sensei_course_meta()

    /**
     * @deprecated since 1.9.0
     */
	public function sensei_course_meta_video() {
        _deprecated_function( 'Sensei_Frontend::sensei_course_meta_video', '1.9.0' , 'Sensei_Course::the_course_video()' );
        Sensei_Course::the_course_video();
	} // End sensei_course_meta_video()

    /**
     * This function shows the WooCommerce cart notice if the user has
     * added the current course to cart. It does not show if the user is already taking
     * the course.
     *
     * @since 1.0.2
     * @return void;
     */
    public function sensei_woocommerce_in_cart_message() {
		global $post, $woocommerce;

		$wc_post_id = absint( get_post_meta( $post->ID, '_course_woocommerce_product', true ) );
        $user_course_status_id = Sensei_Utils::user_started_course($post->ID , get_current_user_id() );
		if ( 0 < intval( $wc_post_id ) && ! $user_course_status_id ) {

			if ( Sensei_WC::is_product_in_cart( $wc_post_id ) ) {
				echo '<div class="sensei-message info">' . sprintf(  __('You have already added this Course to your cart. Please %1$s to access the course.', 'woothemes-sensei') . '</div>', '<a class="cart-complete" href="' . $woocommerce->cart->get_checkout_url() . '" title="' . __('complete the purchase', 'woothemes-sensei') . '">' . __('complete the purchase', 'woothemes-sensei') . '</a>' );
			} // End If Statement

		} // End If Statement

	} // End sensei_woocommerce_in_cart_message()

	// Deprecated
	public function sensei_lesson_comment_count( $count ) {
		return $count;
	} // End sensei_lesson_comment_count()

	/**
	 * Only show excerpts for lessons and courses in search results
	 * @param  string $content Original content
	 * @return string          Modified content
	 */
	public function sensei_search_results_excerpt( $content ) {
		global $post;

		if( is_search() && in_array( $post->post_type, array( 'course', 'lesson' ) ) ) {
			$content = '<p class="course-excerpt">' . the_excerpt( ) . '</p>';
		}

		return $content;
	} // End sensei_search_results_excerpt()

	/**
	 * Remove active course when an order is refunded or cancelled
	 * @param  integer $order_id ID of order
	 * @return void
	 */
	public function remove_active_course( $order_id ) {
		$order = new WC_Order( $order_id );

		foreach ( $order->get_items() as $item ) {
			if ( isset( $item['variation_id'] ) && ( 0 < $item['variation_id'] ) ) {
				// If item has variation_id then its a variation of the product
				$item_id = $item['variation_id'];
			} else {
				// Than its real product set it's id to item_id
				$item_id = $item['product_id'];
			} 

            if ( $item_id > 0 ) {

				$user_id = get_post_meta( $order_id, '_customer_user', true );

				if( $user_id ) {

					// Get all courses for product
					$args = array(
						'posts_per_page' => -1,
						'post_type' => 'course',
						'meta_query' => array(
							array(
								'key' => '_course_woocommerce_product',
								'value' => $item_id
							)
						),
						'orderby' => 'menu_order date',
						'order' => 'ASC',
						'fields' => 'ids',
					);
					$course_ids = get_posts( $args );

					if( $course_ids && count( $course_ids ) > 0 ) {
						foreach( $course_ids as $course_id ) {

							// Remove all course user meta
							Sensei_Utils::sensei_remove_user_from_course( $course_id, $user_id );

						} // End For Loop
					} // End If Statement
				} // End If Statement
			} // End If Statement
		} // End For Loop
	} // End remove_active_course()


	/**
	 * Activate all purchased courses for user
	 * @since  1.4.8
	 * @param  integer $user_id User ID
	 * @return void
	 */
	public function activate_purchased_courses( $user_id = 0 ) {

		if( $user_id ) {

			if( Sensei_WC::is_woocommerce_active() ) {

				// Get all user's orders
				$order_args = array(
					'post_type' => 'shop_order',
					'post_status' =>  array( 'wc-processing', 'wc-completed' ),
					'posts_per_page' => -1,
					'meta_query' => array(
						array(
							'key' => '_customer_user',
							'value' => $user_id
						)
					),
				);

				$orders = get_posts( $order_args );

				$product_ids = array();
				$order_ids = array();

				foreach( $orders as $post_id ) {

					// Only process each order once
					$processed = get_post_meta( $post_id, 'sensei_products_processed', true );

					if( $processed && $processed == 'processed' ) {
						continue;
					}

					// Get course product IDs from order
					$order = new WC_Order( $post_id );

					$items = $order->get_items();
					foreach( $items as $item ) {
                                            if (isset($item['variation_id']) && $item['variation_id'] > 0) {
                                                $item_id = $item['variation_id'];
                                                $product_type = 'variation';
                                            } else {
                                                $item_id = $item['product_id'];
                                            }

                                            $product_ids[] = $item_id;
                                            }

					$order_ids[] = $post_id;
				}

				if( count( $product_ids ) > 0 ) {

					// Get all courses from user's orders
					$course_args = array(
						'post_type' => 'course',
						'posts_per_page' => -1,
						'meta_query' => array(
							array(
								'key' => '_course_woocommerce_product',
								'value' => $product_ids,
								'compare' => 'IN'
							)
						),
						'orderby' => 'menu_order date',
						'order' => 'ASC',
						'fields' => 'ids',
					);
					$course_ids = get_posts( $course_args );

					foreach( $course_ids as $course_id ) {

						$user_course_status = Sensei_Utils::user_course_status( intval($course_id), $user_id );

						// Ignore course if already completed
						if( Sensei_Utils::user_completed_course( $user_course_status ) ) {
							continue;
						}

						// Ignore course if already started
						if( $user_course_status ) {
							continue;
						}

						// Mark course as started by user
						Sensei_Utils::user_start_course( $user_id, $course_id );
					}
				}

				if( count( $order_ids ) > 0 ) {
					foreach( $order_ids as $order_id ) {
						// Mark order as processed
						update_post_meta( $order_id, 'sensei_products_processed', 'processed' );
					}
				}
			}
		}
	} // End activate_purchased_courses()

	/**
	 * Activate single course if already purchases
	 * @return void
	 */
	public function activate_purchased_single_course() {
		global $post, $current_user;

		if( Sensei_WC::is_woocommerce_active() ) {

			if( ! is_user_logged_in() ) return;
			if( ! isset( $post->ID ) ) return;

			$user_id = $current_user->ID;
			$course_id = $post->ID;
			$course_product_id = (int) get_post_meta( $course_id, '_course_woocommerce_product', true );
			if( ! $course_product_id ) {
				return;
			}

			$user_course_status = Sensei_Utils::user_course_status( intval($course_id), $user_id );

			// Ignore course if already completed
			if( Sensei_Utils::user_completed_course( $user_course_status ) ) {

				return;
			}

			// Ignore course if already started
			if( $user_course_status ) {
				return;
			}

			// Get all user's orders
			$order_args = array(
				'post_type' => 'shop_order',
				'posts_per_page' => -1,
				'post_status' => array( 'wc-processing', 'wc-completed' ),
				'meta_query' => array(
					array(
						'key' => '_customer_user',
						'value' => $user_id
					)
				),
				'fields' => 'ids',
			);
			$orders = get_posts( $order_args );

			foreach( $orders as $order_post_id ) {

				// Get course product IDs from order
				$order = new WC_Order( $order_post_id );

				$items = $order->get_items();
				foreach( $items as $item ) {

                    $product = wc_get_product( $item['product_id'] );

                    // handle product bundles
                    if( is_object( $product ) &&  $product->is_type('bundle') ){

                        $bundled_product = new WC_Product_Bundle( $product->id );
                        $bundled_items = $bundled_product->get_bundled_items();

                        foreach( $bundled_items as $bundled_item ){

                            if( $bundled_item->product_id == $course_product_id ) {
                                Sensei_Utils::user_start_course( $user_id, $course_id );
                                return;
                            }

                        }

                    } else {

                    // handle regular products
                        if( $item['product_id'] == $course_product_id ) {
                            Sensei_Utils::user_start_course( $user_id, $course_id );
                            return;
                        }

                    }
				}
			}

		}
	} // End activate_purchased_single_course()

	/**
	 * Hide Sensei activity comments from frontend (requires WordPress 4.0+)
	 * @param  array  $args Default arguments
	 * @return array        Modified arguments
	 */
	public function hide_sensei_activity( $args = array() ) {

		if( is_singular( 'lesson' ) || is_singular( 'course' ) ) {
			$args['type'] = 'comment';
		}

		return $args;
	} // End hide_sensei_activity()

	/**
	 * Redirect failed login attempts to the front end login page
	 * in the case where the login fields are not left empty
	 *
	 * @return void redirect
	 */
	function sensei_login_fail_redirect( ) {

		//if not posted from the sensei login form let
		// WordPress or any other party handle the failed request
	    if( ! isset( $_REQUEST['form'] ) || 'sensei-login' != $_REQUEST['form']  ){

	    	return ;

	    }

    	// Get the reffering page, where did the post submission come from?
    	$referrer = add_query_arg('login', false, $_SERVER['HTTP_REFERER']);

   		 // if there's a valid referrer, and it's not the default log-in screen
	    if(!empty($referrer) && !strstr($referrer,'wp-login') && !strstr($referrer,'wp-admin')){
	        // let's append some information (login=failed) to the URL for the theme to use
	        wp_redirect( esc_url_raw( add_query_arg('login', 'failed',  $referrer) ) );
	    	exit;
    	}
	}// End sensei_login_fail_redirect_to_front_end_login

	/**
	 * Handle the login reques from all sensei intiated login forms.
	 *
	 * @return void redirect
	 */
	function sensei_handle_login_request( ) {

		// Check that it is a sensei login request and if it has a valid nonce
	    if(  isset( $_REQUEST['form'] ) && 'sensei-login' == $_REQUEST['form'] ) {

	    	// Validate the login request nonce
		    if( !wp_verify_nonce( $_REQUEST['_wpnonce'], 'sensei-login' ) ){
		    	return;
		    }

		    //get the page where the sensei log form is located
		    $referrer = $_REQUEST['_wp_http_referer'];
		    //$redirect = $_REQUEST['_sensei_redirect'];

		    if ( ( isset( $_REQUEST['log'] ) && !empty( $_REQUEST['log'] ) )
		    	 && ( isset( $_REQUEST['pwd'] ) && !empty( $_REQUEST['pwd'] ) ) ){

		    	// when the user has entered a password or username do the sensei login
		    	$creds = array();

		    	// check if the requests login is an email address
		    	if( is_email(  trim( $_REQUEST['log'] ) )  ){
		    		// query wordpress for the users details
		    		$user =	get_user_by( 'email', sanitize_email( $_REQUEST['log'] )  );

		    		// validate the user object
		    		if( !$user ){

		    			// the email doesnt exist
                        wp_redirect( esc_url_raw( add_query_arg('login', 'failed', $referrer) ) );
		        		exit;

		    		}

		    		//assigne the username to the creds array for further processing
		    		$creds['user_login'] =  $user->user_login ;

		    	}else{

		    		// process this as a default username login
		    		$creds['user_login'] = sanitize_text_field( $_REQUEST['log'] ) ;

		    	}

				// get setup the rest of the creds array
				$creds['user_password'] = sanitize_text_field( $_REQUEST['pwd'] );
				$creds['remember'] = isset( $_REQUEST['rememberme'] ) ? true : false ;

				//attempt logging in with the given details
			    $secure_cookie = is_ssl() ? true : false;
			    $user = wp_signon( $creds, $secure_cookie );

				if ( is_wp_error($user) ){ // on login failure
                    wp_redirect( esc_url_raw( add_query_arg('login', 'failed', $referrer) ) );
                    exit;
				}else{ // on login success

					/**
					* change the redirect url programatically
					*
					* @since 1.6.1
					*
					* @param string $referrer the page where the current url wheresensei login form was posted from
					*/

					$success_redirect_url = apply_filters('sesei_login_success_redirect_url', remove_query_arg( 'login', $referrer ) );

					wp_redirect( esc_url_raw( $success_redirect_url ) );
		        	exit;

				}	// end is_wp_error($user)

		    }else{ // if username or password is empty

                wp_redirect( esc_url_raw( add_query_arg('login', 'emptyfields', $referrer) ) );
		        exit;

		    } // end if username $_REQUEST['log']  and password $_REQUEST['pwd'] is empty

	    }elseif( ( isset( $_GET['login'] ) ) ) {
	    	// else if this request is a redircect from a previously faile login request
	    	$this->login_message_process();

			//exit the handle login request function
			return;
	    }

	    // if none of the above
	    return;

	} // End  sensei_login_fail_redirect_to_front_end_login

	/**
	 * handle sensei specific registration requests
	 *
	 * @return void redirect
	 *
	 */
	public function sensei_process_registration(){
		global 	 $current_user;
		// check the for the sensei specific registration requests
		if( !isset( $_POST['sensei_reg_username'] ) && ! isset( $_POST['sensei_reg_email'] ) && !isset( $_POST['sensei_reg_password'] )){
			// exit if this is not a sensei registration request
			return ;
		}
		// check for spam throw cheating huh
		if( isset( $_POST['email_2'] ) &&  '' !== $_POST['email_2']   ){
			$message = 'Error:  The spam field should be empty';
			Sensei()->notices->add_notice( $message, 'alert');
			return;
		}

		// retreive form variables
		$new_user_name		= sanitize_user( $_POST['sensei_reg_username'] );
		$new_user_email		= $_POST['sensei_reg_email'];
		$new_user_password	= $_POST['sensei_reg_password'];

		// Check the username
		$username_error_notice = '';
		if ( $new_user_name == '' ) {
			$username_error_notice =  __( '<strong>ERROR</strong>: Please enter a username.' );
		} elseif ( ! validate_username( $new_user_name ) ) {
			$username_error_notice =  __( '<strong>ERROR</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' );
		} elseif ( username_exists( $new_user_name ) ) {
			$username_error_notice =  __( '<strong>ERROR</strong>: This username is already registered. Please choose another one.' );
		}

		// exit on username error
		if( '' !== $username_error_notice ){
			Sensei()->notices->add_notice( $username_error_notice , 'alert');
			return;
		}

		// Check the e-mail address
		$email_error_notice = '';
		if ( $new_user_email == '' ) {
			$email_error_notice = __( '<strong>ERROR</strong>: Please type your e-mail address.' );
		} elseif ( ! is_email( $new_user_email ) ) {
			$email_error_notice = __( '<strong>ERROR</strong>: The email address isn&#8217;t correct.' );
		} elseif ( email_exists( $new_user_email ) ) {
			$email_error_notice = __( '<strong>ERROR</strong>: This email is already registered, please choose another one.' );
		}

		// exit on email address error
		if( '' !== $email_error_notice ){
			Sensei()->notices->add_notice( $email_error_notice , 'alert');
			return;
		}

		//check user password

		// exit on email address error
		if( empty( $new_user_password ) ){
			Sensei()->notices->add_notice(  __( '<strong>ERROR</strong>: The password field may not be empty, please enter a secure password.' )  , 'alert');
			return;
		}

		// register user
		$user_id = wp_create_user( $new_user_name, $new_user_password, $new_user_email );
		if ( ! $user_id || is_wp_error( $user_id ) ) {
			Sensei()->notices->add_notice( sprintf( __( '<strong>ERROR</strong>: Couldn\'t register you&hellip; please contact the <a href="mailto:%s">webmaster</a> !' ), get_option( 'admin_email' ) ), 'alert');
		}

		// notify the user
		wp_new_user_notification( $user_id, $new_user_password );

		// set global current user aka log the user in
		$current_user = get_user_by( 'id', $user_id );
		wp_set_auth_cookie( $user_id, true );

		// Redirect
		global $wp;
		if ( wp_get_referer() ) {
			$redirect = esc_url( wp_get_referer() );
		} else {
			$redirect = esc_url( home_url( $wp->request ) );
		}

		wp_redirect( apply_filters( 'sensei_registration_redirect', $redirect ) );
		exit;

	} // end  sensei_process_registration)()

	/**
	 * login_message_process(). handle the login message displayed on faile login
	 *
	 * @return void redirect
	 * @since 1.7.0
	 */
	public function login_message_process(){

            // setup the message variables
			$message = '';

			//only output message if the url contains login=failed and login=emptyfields

			if( $_GET['login'] == 'failed' ){

				$message = __('Incorrect login details', 'woothemes-sensei' );

			}elseif( $_GET['login'] == 'emptyfields'  ){

				$message= __('Please enter your username and password', 'woothemes-sensei' );
			}

			Sensei()->notices->add_notice( $message, 'alert');

	}// end login_message_process


    /**
     * sensei_show_admin_bar(). Use WooCommerce filter
     * to show admin bar to Teachers as well.
     *
     * @return void redirect
     *
     */
    public function sensei_show_admin_bar () {

        if (current_user_can('edit_courses')) {

            add_filter( 'woocommerce_disable_admin_bar', '__return_false', 10, 1);

        }

    }

} // End Class

/**
 * Class WooThemes_Sensei_Frontend
 * @ignore only for backward compatibility
 * @since 1.9.0
 */
class WooThemes_Sensei_Frontend extends Sensei_Frontend{}

woothemes / sensei

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