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<?php /** * WPSEO plugin file. * * @package WPSEO\Admin\Notifications */ use Yoast\WP\SEO\Presenters\Abstract_Presenter; /** * Handles notifications storage and display. */ class Yoast_Notification_Center { /** * Option name to store notifications on. * * @var string */ public const STORAGE_KEY = 'yoast_notifications'; /** * The singleton instance of this object. * * @var Yoast_Notification_Center */ private static $instance = null; /** * Holds the notifications. * * @var Yoast_Notification[][] */ private $notifications = []; /** * Notifications there are newly added. * * @var array */ private $new = []; /** * Notifications that were resolved this execution. * * @var int */ private $resolved = 0; /** * Internal storage for transaction before notifications have been retrieved from storage. * * @var array */ private $queued_transactions = []; /** * Internal flag for whether notifications have been retrieved from storage. * * @var bool */ private $notifications_retrieved = false; /** * Internal flag for whether notifications need to be updated in storage. * * @var bool */ private $notifications_need_storage = false; /** * Construct. */ private function __construct() { add_action( 'init', [ $this, 'setup_current_notifications' ], 1 ); add_action( 'all_admin_notices', [ $this, 'display_notifications' ] ); add_action( 'wp_ajax_yoast_get_notifications', [ $this, 'ajax_get_notifications' ] ); add_action( 'wpseo_deactivate', [ $this, 'deactivate_hook' ] ); add_action( 'shutdown', [ $this, 'update_storage' ] ); } /** * Singleton getter. * * @return Yoast_Notification_Center */ public static function get() { if ( self::$instance === null ) { self::$instance = new self(); } return self::$instance; } /** * Dismiss a notification. * * @return void */ public static function ajax_dismiss_notification() { $notification_center = self::get(); if ( ! isset( $_POST['notification'] ) || ! is_string( $_POST['notification'] ) ) { die( '-1' ); } $notification_id = sanitize_text_field( wp_unslash( $_POST['notification'] ) ); if ( empty( $notification_id ) ) { die( '-1' ); } // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Reason: We are using the variable as a nonce. if ( ! isset( $_POST['nonce'] ) || ! wp_verify_nonce( wp_unslash( $_POST['nonce'] ), $notification_id ) ) { die( '-1' ); } $notification = $notification_center->get_notification_by_id( $notification_id ); if ( ( $notification instanceof Yoast_Notification ) === false ) { // Permit legacy. $options = [ 'id' => $notification_id, 'dismissal_key' => $notification_id, ]; $notification = new Yoast_Notification( '', $options ); } if ( self::maybe_dismiss_notification( $notification ) ) { die( '1' ); } die( '-1' ); } /** * Check if the user has dismissed a notification. * * @param Yoast_Notification $notification The notification to check for dismissal. * @param int|null $user_id User ID to check on. * * @return bool */ public static function is_notification_dismissed( Yoast_Notification $notification, $user_id = null ) { $user_id = self::get_user_id( $user_id ); $dismissal_key = $notification->get_dismissal_key(); // This checks both the site-specific user option and the meta value. $current_value = get_user_option( $dismissal_key, $user_id ); // Migrate old user meta to user option on-the-fly. if ( ! empty( $current_value ) && metadata_exists( 'user', $user_id, $dismissal_key ) && update_user_option( $user_id, $dismissal_key, $current_value ) ) { delete_user_meta( $user_id, $dismissal_key ); } return ! empty( $current_value ); } /** * Checks if the notification is being dismissed. * * @param Yoast_Notification $notification Notification to check dismissal of. * @param string $meta_value Value to set the meta value to if dismissed. * * @return bool True if dismissed. */ public static function maybe_dismiss_notification( Yoast_Notification $notification, $meta_value = 'seen' ) { // Only persistent notifications are dismissible. if ( ! $notification->is_persistent() ) { return false; } // If notification is already dismissed, we're done. if ( self::is_notification_dismissed( $notification ) ) { return true; } $dismissal_key = $notification->get_dismissal_key(); $notification_id = $notification->get_id(); $is_dismissing = ( $dismissal_key === self::get_user_input( 'notification' ) ); if ( ! $is_dismissing ) { $is_dismissing = ( $notification_id === self::get_user_input( 'notification' ) ); } // Fallback to ?dismissal_key=1&nonce=bla when JavaScript fails. if ( ! $is_dismissing ) { $is_dismissing = ( self::get_user_input( $dismissal_key ) === '1' ); } if ( ! $is_dismissing ) { return false; } $user_nonce = self::get_user_input( 'nonce' ); if ( wp_verify_nonce( $user_nonce, $notification_id ) === false ) { return false; } return self::dismiss_notification( $notification, $meta_value ); } /** * Dismisses a notification. * * @param Yoast_Notification $notification Notification to dismiss. * @param string $meta_value Value to save in the dismissal. * * @return bool True if dismissed, false otherwise. */ public static function dismiss_notification( Yoast_Notification $notification, $meta_value = 'seen' ) { // Dismiss notification. return update_user_option( get_current_user_id(), $notification->get_dismissal_key(), $meta_value ) !== false; } /** * Restores a notification. * * @param Yoast_Notification $notification Notification to restore. * * @return bool True if restored, false otherwise. */ public static function restore_notification( Yoast_Notification $notification ) { $user_id = get_current_user_id(); $dismissal_key = $notification->get_dismissal_key(); // Restore notification. $restored = delete_user_option( $user_id, $dismissal_key ); // Delete unprefixed user meta too for backward-compatibility. if ( metadata_exists( 'user', $user_id, $dismissal_key ) ) { $restored = delete_user_meta( $user_id, $dismissal_key ) && $restored; } return $restored; } /** * Clear dismissal information for the specified Notification. * * When a cause is resolved, the next time it is present we want to show * the message again. * * @param string|Yoast_Notification $notification Notification to clear the dismissal of. * * @return bool */ public function clear_dismissal( $notification ) { global $wpdb; if ( $notification instanceof Yoast_Notification ) { $dismissal_key = $notification->get_dismissal_key(); } if ( is_string( $notification ) ) { $dismissal_key = $notification; } if ( empty( $dismissal_key ) ) { return false; } // Remove notification dismissal for all users. $deleted = delete_metadata( 'user', 0, $wpdb->get_blog_prefix() . $dismissal_key, '', true ); // Delete unprefixed user meta too for backward-compatibility. $deleted = delete_metadata( 'user', 0, $dismissal_key, '', true ) || $deleted; return $deleted; } /** * Retrieves notifications from the storage and merges in previous notification changes. * * The current user in WordPress is not loaded shortly before the 'init' hook, but the plugin * sometimes needs to add or remove notifications before that. In such cases, the transactions * are not actually executed, but added to a queue. That queue is then handled in this method, * after notifications for the current user have been set up. * * @return void */ public function setup_current_notifications() { $this->retrieve_notifications_from_storage( get_current_user_id() ); foreach ( $this->queued_transactions as $transaction ) { list( $callback, $args ) = $transaction; call_user_func_array( $callback, $args ); } $this->queued_transactions = []; } /** * Add notification to the cookie. * * @param Yoast_Notification $notification Notification object instance. * * @return void */ public function add_notification( Yoast_Notification $notification ) { $callback = [ $this, __FUNCTION__ ]; $args = func_get_args(); if ( $this->queue_transaction( $callback, $args ) ) { return; } // Don't add if the user can't see it. if ( ! $notification->display_for_current_user() ) { return; } $notification_id = $notification->get_id(); $user_id = $notification->get_user_id(); // Empty notifications are always added. if ( $notification_id !== '' ) { // If notification ID exists in notifications, don't add again. $present_notification = $this->get_notification_by_id( $notification_id, $user_id ); if ( ! is_null( $present_notification ) ) { $this->remove_notification( $present_notification, false ); } if ( is_null( $present_notification ) ) { $this->new[] = $notification_id; } } // Add to list. $this->notifications[ $user_id ][] = $notification; $this->notifications_need_storage = true; } /** * Get the notification by ID and user ID. * * @param string $notification_id The ID of the notification to search for. * @param int|null $user_id The ID of the user. * * @return Yoast_Notification|null */ public function get_notification_by_id( $notification_id, $user_id = null ) { $user_id = self::get_user_id( $user_id ); $notifications = $this->get_notifications_for_user( $user_id ); foreach ( $notifications as $notification ) { if ( $notification_id === $notification->get_id() ) { return $notification; } } return null; } /** * Display the notifications. * * @param bool $echo_as_json True when notifications should be printed directly. * * @return void */ public function display_notifications( $echo_as_json = false ) { // Never display notifications for network admin. if ( is_network_admin() ) { return; } $sorted_notifications = $this->get_sorted_notifications(); $notifications = array_filter( $sorted_notifications, [ $this, 'is_notification_persistent' ] ); if ( empty( $notifications ) ) { return; } array_walk( $notifications, [ $this, 'remove_notification' ] ); $notifications = array_unique( $notifications ); if ( $echo_as_json ) { $notification_json = []; foreach ( $notifications as $notification ) { $notification_json[] = $notification->render(); } // phpcs:ignore WordPress.Security.EscapeOutput -- Reason: WPSEO_Utils::format_json_encode is safe. echo WPSEO_Utils::format_json_encode( $notification_json ); return; } foreach ( $notifications as $notification ) { // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Reason: Temporarily disabled, see: https://github.com/Yoast/wordpress-seo-premium/issues/2510 and https://github.com/Yoast/wordpress-seo-premium/issues/2511. echo $notification; } } /** * Remove notification after it has been displayed. * * @param Yoast_Notification $notification Notification to remove. * @param bool $resolve Resolve as fixed. * * @return void */ public function remove_notification( Yoast_Notification $notification, $resolve = true ) { $callback = [ $this, __FUNCTION__ ]; $args = func_get_args(); if ( $this->queue_transaction( $callback, $args ) ) { return; } $index = false; // ID of the user to show the notification for, defaults to current user id. $user_id = $notification->get_user_id(); $notifications = $this->get_notifications_for_user( $user_id ); // Match persistent Notifications by ID, non persistent by item in the array. if ( $notification->is_persistent() ) { foreach ( $notifications as $current_index => $present_notification ) { if ( $present_notification->get_id() === $notification->get_id() ) { $index = $current_index; break; } } } else { $index = array_search( $notification, $notifications, true ); } if ( $index === false ) { return; } if ( $notification->is_persistent() && $resolve ) { ++$this->resolved; $this->clear_dismissal( $notification ); } unset( $notifications[ $index ] ); $this->notifications[ $user_id ] = array_values( $notifications ); $this->notifications_need_storage = true; } /** * Removes a notification by its ID. * * @param string $notification_id The notification id. * @param bool $resolve Resolve as fixed. * * @return void */ public function remove_notification_by_id( $notification_id, $resolve = true ) { $notification = $this->get_notification_by_id( $notification_id ); if ( $notification === null ) { return; } $this->remove_notification( $notification, $resolve ); $this->notifications_need_storage = true; } /** * Get the notification count. * * @param bool $dismissed Count dismissed notifications. * * @return int Number of notifications */ public function get_notification_count( $dismissed = false ) { $notifications = $this->get_notifications_for_user( get_current_user_id() ); $notifications = array_filter( $notifications, [ $this, 'filter_persistent_notifications' ] ); if ( ! $dismissed ) { $notifications = array_filter( $notifications, [ $this, 'filter_dismissed_notifications' ] ); } return count( $notifications ); } /** * Get the number of notifications resolved this execution. * * These notifications have been resolved and should be counted when active again. * * @return int */ public function get_resolved_notification_count() { return $this->resolved; } /** * Return the notifications sorted on type and priority. * * @return array|Yoast_Notification[] Sorted Notifications */ public function get_sorted_notifications() { $notifications = $this->get_notifications_for_user( get_current_user_id() ); if ( empty( $notifications ) ) { return []; } // Sort by severity, error first. usort( $notifications, [ $this, 'sort_notifications' ] ); return $notifications; } /** * AJAX display notifications. * * @return void */ public function ajax_get_notifications() { $echo = false; // phpcs:ignore WordPress.Security.NonceVerification.Missing,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Reason: We are not processing form data. if ( isset( $_POST['version'] ) && is_string( $_POST['version'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Missing,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Reason: We are only comparing the variable in a condition. $echo = wp_unslash( $_POST['version'] ) === '2'; } // Display the notices. $this->display_notifications( $echo ); // AJAX die. exit; } /** * Remove storage when the plugin is deactivated. * * @return void */ public function deactivate_hook() { $this->clear_notifications(); } /** * Returns the given user ID if it exists. * Otherwise, this function returns the ID of the current user. * * @param int $user_id The user ID to check. * * @return int The user ID to use. */ private static function get_user_id( $user_id ) { if ( $user_id ) { return $user_id; } return get_current_user_id(); } /** * Splits the notifications on user ID. * * In other terms, it returns an associative array, * mapping user ID to a list of notifications for this user. * * @param array|Yoast_Notification[] $notifications The notifications to split. * * @return array The notifications, split on user ID. */ private function split_on_user_id( $notifications ) { $split_notifications = []; foreach ( $notifications as $notification ) { $split_notifications[ $notification->get_user_id() ][] = $notification; } return $split_notifications; } /** * Save persistent notifications to storage. * * We need to be able to retrieve these so they can be dismissed at any time during the execution. * * @since 3.2 * * @return void */ public function update_storage() { /** * Plugins might exit on the plugins_loaded hook. * This prevents the pluggable.php file from loading, as it's loaded after the plugins_loaded hook. * As we need functions defined in pluggable.php, make sure it's loaded. */ require_once ABSPATH . WPINC . '/pluggable.php'; $notifications = $this->notifications; /** * One array of Yoast_Notifications, merged from multiple arrays. * * @var Yoast_Notification[] $merged_notifications */ $merged_notifications = []; if ( ! empty( $notifications ) ) { $merged_notifications = array_merge( ...$notifications ); } /** * Filter: 'yoast_notifications_before_storage' - Allows developer to filter notifications before saving them. * * @param Yoast_Notification[] $notifications */ $filtered_merged_notifications = apply_filters( 'yoast_notifications_before_storage', $merged_notifications ); // The notifications were filtered and therefore need to be stored. if ( $merged_notifications !== $filtered_merged_notifications ) { $merged_notifications = $filtered_merged_notifications; $this->notifications_need_storage = true; } $notifications = $this->split_on_user_id( $merged_notifications ); // No notifications to store, clear storage if it was previously present. if ( empty( $notifications ) ) { $this->remove_storage(); return; } // Only store notifications if changes are made. if ( $this->notifications_need_storage ) { array_walk( $notifications, [ $this, 'store_notifications_for_user' ] ); } } /** * Stores the notifications to its respective user's storage. * * @param array|Yoast_Notification[] $notifications The notifications to store. * @param int $user_id The ID of the user for which to store the notifications. * * @return void */ private function store_notifications_for_user( $notifications, $user_id ) { $notifications_as_arrays = array_map( [ $this, 'notification_to_array' ], $notifications ); update_user_option( $user_id, self::STORAGE_KEY, $notifications_as_arrays ); } /** * Provide a way to verify present notifications. * * @return array|Yoast_Notification[] Registered notifications. */ public function get_notifications() { if ( ! $this->notifications ) { return []; } return array_merge( ...$this->notifications ); } /** * Returns the notifications for the given user. * * @param int $user_id The id of the user to check. * * @return Yoast_Notification[] The notifications for the user with the given ID. */ public function get_notifications_for_user( $user_id ) { if ( array_key_exists( $user_id, $this->notifications ) ) { return $this->notifications[ $user_id ]; } return []; } /** * Get newly added notifications. * * @return array */ public function get_new_notifications() { return array_map( [ $this, 'get_notification_by_id' ], $this->new ); } /** * Get information from the User input. * * Note that this function does not handle nonce verification. * * @param string $key Key to retrieve. * * @return string non-sanitized value of key if set, an empty string otherwise. */ private static function get_user_input( $key ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized,WordPress.Security.NonceVerification.Missing -- Reason: We are not processing form information and only using this variable in a comparison. $request_method = isset( $_SERVER['REQUEST_METHOD'] ) && is_string( $_SERVER['REQUEST_METHOD'] ) ? strtoupper( wp_unslash( $_SERVER['REQUEST_METHOD'] ) ) : ''; // phpcs:disable WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Reason: This function does not sanitize variables. // phpcs:disable WordPress.Security.NonceVerification.Recommended,WordPress.Security.NonceVerification.Missing -- Reason: This function does not verify a nonce. if ( $request_method === 'POST' ) { if ( isset( $_POST[ $key ] ) && is_string( $_POST[ $key ] ) ) { return wp_unslash( $_POST[ $key ] ); } } elseif ( isset( $_GET[ $key ] ) && is_string( $_GET[ $key ] ) ) { return wp_unslash( $_GET[ $key ] ); } // phpcs:enable WordPress.Security.NonceVerification.Missing,WordPress.Security.NonceVerification.Missing,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized return ''; } /** * Retrieve the notifications from storage and fill the relevant property. * * @param int $user_id The ID of the user to retrieve notifications for. * * @return void */ private function retrieve_notifications_from_storage( $user_id ) { if ( $this->notifications_retrieved ) { return; } $this->notifications_retrieved = true; $stored_notifications = get_user_option( self::STORAGE_KEY, $user_id ); // Check if notifications are stored. if ( empty( $stored_notifications ) ) { return; } if ( is_array( $stored_notifications ) ) { $notifications = array_map( [ $this, 'array_to_notification' ], $stored_notifications ); // Apply array_values to ensure we get a 0-indexed array. $notifications = array_values( array_filter( $notifications, [ $this, 'filter_notification_current_user' ] ) ); $this->notifications[ $user_id ] = $notifications; } } /** * Sort on type then priority. * * @param Yoast_Notification $a Compare with B. * @param Yoast_Notification $b Compare with A. * * @return int 1, 0 or -1 for sorting offset. */ private function sort_notifications( Yoast_Notification $a, Yoast_Notification $b ) { $a_type = $a->get_type(); $b_type = $b->get_type(); if ( $a_type === $b_type ) { return WPSEO_Utils::calc( $b->get_priority(), 'compare', $a->get_priority() ); } if ( $a_type === 'error' ) { return -1; } if ( $b_type === 'error' ) { return 1; } return 0; } /** * Clear local stored notifications. * * @return void */ private function clear_notifications() { $this->notifications = []; $this->notifications_retrieved = false; } /** * Filter out non-persistent notifications. * * @since 3.2 * * @param Yoast_Notification $notification Notification to test for persistent. * * @return bool */ private function filter_persistent_notifications( Yoast_Notification $notification ) { return $notification->is_persistent(); } /** * Filter out dismissed notifications. * * @param Yoast_Notification $notification Notification to check. * * @return bool */ private function filter_dismissed_notifications( Yoast_Notification $notification ) { return ! self::maybe_dismiss_notification( $notification ); } /** * Convert Notification to array representation. * * @since 3.2 * * @param Yoast_Notification $notification Notification to convert. * * @return array */ private function notification_to_array( Yoast_Notification $notification ) { $notification_data = $notification->to_array(); if ( isset( $notification_data['nonce'] ) ) { unset( $notification_data['nonce'] ); } return $notification_data; } /** * Convert stored array to Notification. * * @param array $notification_data Array to convert to Notification. * * @return Yoast_Notification */ private function array_to_notification( $notification_data ) { if ( isset( $notification_data['options']['nonce'] ) ) { unset( $notification_data['options']['nonce'] ); } if ( isset( $notification_data['message'] ) && is_subclass_of( $notification_data['message'], Abstract_Presenter::class, false ) ) { $notification_data['message'] = $notification_data['message']->present(); } if ( isset( $notification_data['options']['user'] ) ) { $notification_data['options']['user_id'] = $notification_data['options']['user']->ID; unset( $notification_data['options']['user'] ); $this->notifications_need_storage = true; } return new Yoast_Notification( $notification_data['message'], $notification_data['options'] ); } /** * Filter notifications that should not be displayed for the current user. * * @param Yoast_Notification $notification Notification to test. * * @return bool */ private function filter_notification_current_user( Yoast_Notification $notification ) { return $notification->display_for_current_user(); } /** * Checks if given notification is persistent. * * @param Yoast_Notification $notification The notification to check. * * @return bool True when notification is not persistent. */ private function is_notification_persistent( Yoast_Notification $notification ) { return ! $notification->is_persistent(); } /** * Queues a notification transaction for later execution if notifications are not yet set up. * * @param callable $callback Callback that performs the transaction. * @param array $args Arguments to pass to the callback. * * @return bool True if transaction was queued, false if it can be performed immediately. */ private function queue_transaction( $callback, $args ) { if ( $this->notifications_retrieved ) { return false; } $this->add_transaction_to_queue( $callback, $args ); return true; } /** * Adds a notification transaction to the queue for later execution. * * @param callable $callback Callback that performs the transaction. * @param array $args Arguments to pass to the callback. * * @return void */ private function add_transaction_to_queue( $callback, $args ) { $this->queued_transactions[] = [ $callback, $args ]; } /** * Removes all notifications from storage. * * @return bool True when notifications got removed. */ protected function remove_storage() { if ( ! $this->has_stored_notifications() ) { return false; } delete_user_option( get_current_user_id(), self::STORAGE_KEY ); return true; } /** * Checks if there are stored notifications. * * @return bool True when there are stored notifications. */ protected function has_stored_notifications() { $stored_notifications = $this->get_stored_notifications(); return ! empty( $stored_notifications ); } /** * Retrieves the stored notifications. * * @codeCoverageIgnore * * @return array|false Array with notifications or false when not set. */ protected function get_stored_notifications() { return get_user_option( self::STORAGE_KEY, get_current_user_id() ); } }
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