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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|null
*/
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', [ $this, 'update_storage' ] );
}
/**
* Singleton getter.
*
* @return Yoast_Notification_Center
*/
public static function get() {
self::$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'] ) ) {
exit( '-1' );
}
$notification_id = sanitize_text_field( wp_unslash( $_POST['notification'] ) );
if ( empty( $notification_id ) ) {
exit( '-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 ) ) {
exit( '-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 ) ) {
exit( '1' );
}
exit( '-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 ( $present_notification !== null ) {
$this->remove_notification( $present_notification, false );
}
if ( $present_notification === null ) {
$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 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 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 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 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() );
}
}