Automattic\Jetpack\Connection\Error_Handler

Complexity

Total Complexity

37

Size/Duplication

Total Lines	282
Duplicated Lines	0 %

Coupling/Cohesion

Components	2
Dependencies	0

Importance

Changes

0

13 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	3	1
A	get_instance()	0	6	2
A	report_error()	0	5	3
A	should_report_error()	0	20	5
B	store_error()	0	40	8
A	get_user_id_from_token()	0	12	4
A	get_stored_errors()	0	7	2
A	get_verified_errors()	0	7	2
A	delete_stored_errors()	0	3	1
A	get_error_by_nonce()	0	11	4
A	verify_error()	0	15	2
A	register_verify_error_endpoint()	0	16	1
A	verify_xml_rpc_error()	0	13	2

<?php
/**
 * The Jetpack Connection error class file.
 *
 * @package automattic/jetpack-connection
 */

namespace Automattic\Jetpack\Connection;

/**
 * The Jetpack Connection Errors that handles errors
 */
class Error_Handler {

	/**
	 * The name of the option that stores the errors
	 *
	 * @var string
	 */
	const STORED_ERRORS_OPTION = 'jetpack_connection_xmlrpc_errors';

	/**
	 * The name of the option that stores the errors
	 *
	 * @var string
	 */
	const STORED_VERIFIED_ERRORS_OPTION = 'jetpack_connection_xmlrpc_verified_errors';

	/**
	 * The prefix of the transient that controls the gate for each error code
	 *
	 * @var string
	 */
	const ERROR_REPORTING_GATE = 'jetpack_connection_error_reporting_gate_';

	/**
	 * Holds the instance of this singleton class
	 *
	 * @var Error_Handler $instance
	 */
	public static $instance = null;

	/**
	 * Initialize hooks
	 */
	private function __construct() {
		add_action( 'rest_api_init', array( $this, 'register_verify_error_endpoint' ) );
	}

	/**
	 * Gets the instance of this singleton class
	 *
	 * @return Error_Handler $instance
	 */
	public static function get_instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Keep track of a connection error that was encoutered
	 *
	 * @param \WP_Error $error the error object.
	 * @param boolean   $force Force the report, even if should_report_error is false.
	 * @return void
	 */
	public function report_error( \WP_Error $error, $force = false ) {
		if ( $this->should_report_error( $error ) || $force ) {
			$this->store_error( $error );
		}
	}

	/**
	 * Checks the status of the gate
	 *
	 * This protects the site (and WPCOM) against over loads.
	 *
	 * @param \WP_Error $error the error object.
	 * @return boolean $should_report True if gate is open and the error should be reported.
	 */
	public function should_report_error( \WP_Error $error ) {

		if ( defined( 'JETPACK_DEV_DEBUG' ) && JETPACK_DEV_DEBUG ) {
			return true;
		}

		$bypass_gate = apply_filters( 'jetpack_connection_bypass_error_reporting_gate', false );
		if ( true === $bypass_gate ) {
			return true;
		}

		$transient = self::ERROR_REPORTING_GATE . $error->get_error_code();

The method get_error_code() does not seem to exist on object<WP_Error>.

		if ( get_transient( $transient ) ) {
			return false;
		}

		set_transient( $transient, true, HOUR_IN_SECONDS );
		return true;
	}

	/**
	 * Stores the error in the database so we know there is an issue and can inform the user
	 *
	 * @param \WP_Error $error the error object.
	 * @return boolean False if stored errors were not updated and true if stored errors were updated.
	 */
	public function store_error( \WP_Error $error ) {
		$stored_errors = $this->get_stored_errors();

		$data       = $error->get_error_data();

The method get_error_data() does not seem to exist on object<WP_Error>.

		$error_code = $error->get_error_code();

The method get_error_code() does not seem to exist on object<WP_Error>.

		if ( ! isset( $data['signature_details'] ) || ! is_array( $data['signature_details'] ) ) {
			return false;
		}

		$data = $data['signature_details'];

		if ( ! isset( $data['token'] ) || empty( $data['token'] ) ) {
			return false;
		}

		$user_id = $this->get_user_id_from_token( $data['token'] );

		if ( ! isset( $stored_errors[ $error_code ] ) || ! is_array( $stored_errors[ $error_code ] ) ) {
			$stored_errors[ $error_code ] = array();
		}

		$stored_errors[ $error_code ][ $user_id ] = array(
			'error_code'    => $error_code,
			'user_id'       => $user_id,
			'error_message' => $error->get_error_message(),

The method get_error_message() does not seem to exist on object<WP_Error>.

			'error_data'    => $data,
			'timestamp'     => time(),
			'nonce'         => wp_generate_password( 10, false ),
		);

		// Let's store a maximum of 5 different user ids for each error code.
		if ( count( $stored_errors[ $error_code ] ) > 5 ) {
			// array_shift will destroy keys here because they are numeric, so manually remove first item.
			$keys = array_keys( $stored_errors[ $error_code ] );
			unset( $stored_errors[ $error_code ][ $keys[0] ] );
		}

		return update_option( self::STORED_ERRORS_OPTION, $stored_errors );
	}

	/**
	 * Extracts the user ID from a token
	 *
	 * @param string $token the token used to make the xml-rpc request.
	 * @return string $the user id or `invalid` if user id not present.
	 */
	public function get_user_id_from_token( $token ) {
		$parsed_token = explode( ':', wp_unslash( $token ) );

		if ( isset( $parsed_token[2] ) && ! empty( $parsed_token[2] ) && ctype_digit( $parsed_token[2] ) ) {
			$user_id = $parsed_token[2];
		} else {
			$user_id = 'invalid';
		}

		return $user_id;

	}

	/**
	 * Gets the reported errors stored in the database
	 *
	 * @return array $errors
	 */
	public function get_stored_errors() {
		$stored_errors = get_option( self::STORED_ERRORS_OPTION );
		if ( ! is_array( $stored_errors ) ) {
			$stored_errors = array();
		}
		return $stored_errors;
	}

	/**
	 * Gets the verified errors stored in the database
	 *
	 * @return array $errors
	 */
	public function get_verified_errors() {
		$verified_errors = get_option( self::STORED_VERIFIED_ERRORS_OPTION );
		if ( ! is_array( $verified_errors ) ) {
			$verified_errors = array();
		}
		return $verified_errors;
	}

	/**
	 * Delete the reported errors stored in the database
	 *
	 * @return boolean True, if option is successfully deleted. False on failure.
	 */
	public function delete_stored_errors() {
		return delete_option( self::STORED_ERRORS_OPTION );
	}

	/**
	 * Verifies an error based on the nonce
	 *
	 * Receives a nonce and finds the related error. If error is found, move it to the verified errors option.
	 *
	 * @param string $nonce The nonce created for the error we want to get.
	 * @return null|array Returns the error array representation or null if error not found.
	 */
	public function get_error_by_nonce( $nonce ) {
		$errors = $this->get_stored_errors();
		foreach ( $errors as $user_group ) {
			foreach ( $user_group as $error ) {
				if ( $error['nonce'] === $nonce ) {
					return $error;
				}
			}
		}
		return null;
	}

	/**
	 * Adds an error to the verified error list
	 *
	 * @param array $error The error array, as it was saved in the unverified errors list.
	 * @return void
	 */
	public function verify_error( $error ) {

		$verified_errors = $this->get_verified_errors();
		$error_code      = $error['error_code'];
		$user_id         = $error['user_id'];

		if ( ! isset( $verified_errors[ $error_code ] ) ) {
			$verified_errors[ $error_code ] = array();
		}

		$verified_errors[ $error_code ][ $user_id ] = $error;

		update_option( self::STORED_VERIFIED_ERRORS_OPTION, $verified_errors );

	}

	/**
	 * Register REST API end point for error hanlding.
	 *
	 * @since 8.7.0
	 *
	 * @return void
	 */
	public function register_verify_error_endpoint() {
		register_rest_route(
			'jetpack/v4',
			'/verify_xmlrpc_error',
			array(
				'methods'  => \WP_REST_Server::CREATABLE,
				'callback' => array( $this, 'verify_xml_rpc_error' ),
				'args'     => array(
					'nonce' => array(
						'required' => true,
						'type'     => 'string',
					),
				),
			)
		);
	}

	/**
	 * Handles verification that a xml rpc error is legit and came from WordPres.com
	 *
	 * @since 8.7.0
	 *
	 * @param \WP_REST_Request $request The request sent to the WP REST API.
	 *
	 * @return boolean
	 */
	public function verify_xml_rpc_error( \WP_REST_Request $request ) {

		// TODO: decrypt data and confirm it came from WPCOM.

		$error = $this->get_error_by_nonce( $request['nonce'] );
		if ( $error ) {
			$this->verify_error( $error );
		}

		// We don't give any useful information away.
		return true;

	}

}