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<?php
/**
* Scheduler class file.
*
* @package Activitypub
*/
namespace Activitypub;
use Activitypub\Activity\Activity;
use Activitypub\Activity\Base_Object;
use Activitypub\Collection\Actors;
use Activitypub\Collection\Inbox;
use Activitypub\Collection\Outbox;
use Activitypub\Collection\Remote_Actors;
use Activitypub\Collection\Remote_Posts;
use Activitypub\Scheduler\Actor;
use Activitypub\Scheduler\Collection_Sync;
use Activitypub\Scheduler\Comment;
use Activitypub\Scheduler\Post;
use Activitypub\Scheduler\Statistics;
/**
* Scheduler class.
*
* @author Matthias Pfefferle
*/
class Scheduler {
/**
* Scheduled events with their recurrence.
*
* @var array
*/
const SCHEDULES = array(
'activitypub_update_remote_actors' => 'hourly',
'activitypub_cleanup_remote_actors' => 'daily',
'activitypub_reprocess_outbox' => 'hourly',
'activitypub_outbox_purge' => 'daily',
'activitypub_inbox_purge' => 'daily',
'activitypub_ap_post_purge' => 'daily',
'activitypub_tombstone_purge' => 'daily',
'activitypub_sync_blocklist_subscriptions' => 'weekly',
);
/**
* Allowed batch callbacks.
*
* @var array
*/
private static $batch_callbacks = array();
/**
* Get the pause between async batches (in seconds).
*
* @param string|false|null $hook Optional. The async batch hook being scheduled. Default current action.
*
* @return int The pause in seconds.
*/
public static function get_retry_delay( $hook = null ) {
if ( null === $hook ) {
$hook = \current_action();
}
/**
* Filters the pause between async batches (in seconds).
*
* @param int $async_batch_pause The pause in seconds. Default 30.
* @param string|false|null $hook The async batch hook being scheduled.
*/
return \apply_filters( 'activitypub_scheduler_async_batch_pause', 30, $hook );
}
/**
* Initialize the class, registering WordPress hooks.
*/
public static function init() {
self::register_schedulers();
// Custom cron schedules.
\add_filter( 'cron_schedules', array( self::class, 'add_cron_schedules' ) );
// Follower Cleanups.
\add_action( 'activitypub_update_remote_actors', array( self::class, 'update_remote_actors' ) );
\add_action( 'activitypub_cleanup_remote_actors', array( self::class, 'cleanup_remote_actors' ) );
// Event callbacks.
\add_action( 'activitypub_async_batch', array( self::class, 'async_batch' ), 10, 99 );
\add_action( 'activitypub_reprocess_outbox', array( self::class, 'reprocess_outbox' ) );
\add_action( 'activitypub_outbox_purge', array( self::class, 'purge_outbox' ) );
\add_action( 'activitypub_inbox_purge', array( self::class, 'purge_inbox' ) );
\add_action( 'activitypub_ap_post_purge', array( self::class, 'purge_ap_posts' ) );
\add_action( 'activitypub_tombstone_purge', array( self::class, 'purge_tombstones' ) );
\add_action( 'activitypub_inbox_create_item', array( self::class, 'process_inbox_activity' ) );
\add_action( 'activitypub_sync_blocklist_subscriptions', array( Blocklist_Subscriptions::class, 'sync_all' ) );
\add_action( 'post_activitypub_add_to_outbox', array( self::class, 'schedule_outbox_activity_for_federation' ) );
\add_action( 'post_activitypub_add_to_outbox', array( self::class, 'schedule_announce_activity' ), 10, 4 );
\add_action( 'update_option_activitypub_outbox_purge_days', array( self::class, 'update_outbox_purge_schedule' ), 10, 2 );
\add_action( 'update_option_activitypub_inbox_purge_days', array( self::class, 'update_inbox_purge_schedule' ), 10, 2 );
\add_action( 'update_option_activitypub_ap_post_purge_days', array( self::class, 'update_ap_post_purge_schedule' ), 10, 2 );
}
/**
* Register handlers.
*/
public static function register_schedulers() {
Post::init();
Actor::init();
Collection_Sync::init();
Comment::init();
Statistics::init();
/**
* Register additional schedulers.
*
* @since 5.0.0
*/
\do_action( 'activitypub_register_schedulers' );
}
/**
* Add custom cron schedules.
*
* @param array $schedules Existing cron schedules.
*
* @return array Modified cron schedules.
*/
public static function add_cron_schedules( $schedules ) {
$schedules['monthly'] = array(
'interval' => MONTH_IN_SECONDS,
'display' => \__( 'Once Monthly', 'activitypub' ),
);
$schedules['yearly'] = array(
'interval' => YEAR_IN_SECONDS,
'display' => \__( 'Once Yearly', 'activitypub' ),
);
return $schedules;
}
/**
* Register a batch callback for async processing.
*
* @param string $hook The cron event hook name.
* @param callable $callback The callback to execute.
*/
public static function register_async_batch_callback( $hook, $callback ) {
if ( \did_action( 'init' ) && ! \doing_action( 'init' ) ) {
\_doing_it_wrong( __METHOD__, 'Async batch callbacks should be registered before or during the init action.', '7.5.0' );
return;
}
if ( ! \is_callable( $callback ) ) {
return;
}
self::$batch_callbacks[ $hook ] = $callback;
// Register the WordPress action hook to trigger async_batch.
\add_action( $hook, array( self::class, 'async_batch' ), 10, 99 );
}
/**
* Schedule all ActivityPub schedules.
*/
public static function register_schedules() {
foreach ( self::SCHEDULES as $hook => $recurrence ) {
if ( ! \wp_next_scheduled( $hook ) ) {
\wp_schedule_event( \time(), $recurrence, $hook );
}
}
// Schedule monthly stats collection for the 1st of each month.
if ( ! \wp_next_scheduled( 'activitypub_collect_monthly_stats' ) ) {
// Calculate next 1st of month at 2:00 AM.
$next_first = self::get_next_first_of_month();
\wp_schedule_event( $next_first, 'monthly', 'activitypub_collect_monthly_stats' );
}
// Schedule annual stats compilation for December 1st (wrapped notification).
if ( ! \wp_next_scheduled( 'activitypub_compile_annual_stats' ) ) {
$next_december = self::get_next_december_first();
\wp_schedule_event( $next_december, 'yearly', 'activitypub_compile_annual_stats' );
}
}
/**
* Un-schedule all ActivityPub schedules.
*
* @return void
*/
public static function deregister_schedules() {
foreach ( \array_keys( self::SCHEDULES ) as $hook ) {
\wp_unschedule_hook( $hook );
}
// Statistics schedules.
\wp_unschedule_hook( 'activitypub_collect_monthly_stats' );
\wp_unschedule_hook( 'activitypub_compile_annual_stats' );
}
/**
* Get the next 1st of month timestamp.
*
* @return int Unix timestamp of next 1st of month at 2:00 AM.
*/
private static function get_next_first_of_month() {
$now = \current_time( 'timestamp' ); // phpcs:ignore WordPress.DateTime.CurrentTimeTimestamp.Requested
$next_month = \strtotime( 'first day of next month 02:00:00', $now );
return $next_month;
}
/**
* Get the next December 1st timestamp for wrapped notification.
*
* @return int Unix timestamp of next December 1st at 3:00 AM.
*/
private static function get_next_december_first() {
$now = \current_time( 'timestamp' ); // phpcs:ignore WordPress.DateTime.CurrentTimeTimestamp.Requested
$year = (int) \gmdate( 'Y', $now );
// Get December 1st 3:00 AM for this year.
$this_year_dec_first = \strtotime( \sprintf( '%d-12-01 03:00:00', $year ) );
// If we're already past this year's December 1st, schedule for next year.
if ( $now >= $this_year_dec_first ) {
return \strtotime( \sprintf( '%d-12-01 03:00:00', $year + 1 ) );
}
return $this_year_dec_first;
}
/**
* Unschedule events for an outbox item.
*
* @param int $outbox_item_id The outbox item ID.
*/
public static function unschedule_events_for_item( $outbox_item_id ) {
\delete_post_meta( $outbox_item_id, '_activitypub_outbox_offset' );
$timestamp = \wp_next_scheduled( 'activitypub_process_outbox', array( $outbox_item_id ) );
\wp_unschedule_event( $timestamp, 'activitypub_process_outbox', array( $outbox_item_id ) );
self::unschedule_outbox_delivery_batches( $outbox_item_id );
// Invalidate any retries for this outbox item.
foreach ( \_get_cron_array() as $timestamp => $cron ) {
if ( ! isset( $cron['activitypub_retry_activity'] ) ) {
continue;
}
foreach ( $cron['activitypub_retry_activity'] as $event ) {
if ( isset( $event['args'][1] ) && $outbox_item_id === $event['args'][1] ) {
\wp_unschedule_event( $timestamp, 'activitypub_retry_activity', $event['args'] );
}
}
}
}
/**
* Update remote Actors.
*/
public static function update_remote_actors() {
$number = 5;
if ( \defined( 'DISABLE_WP_CRON' ) && DISABLE_WP_CRON ) {
$number = 50;
}
/**
* Filter the number of remote Actors to update.
*
* @param int $number The number of remote Actors to update.
*/
$number = \apply_filters( 'activitypub_update_remote_actors_number', $number );
$actors = Remote_Actors::get_outdated( $number );
foreach ( $actors as $actor ) {
/*
* Use Http::get_remote_object() directly here.
* get_remote_metadata_by_actor() short-circuits to the locally
* cached ap_actor CPT via Remote_Actors::fetch_by_uri() and never
* makes an HTTP request when the actor is already cached, so the
* upsert would just rewrite the same stale data and this refresh
* would be a no-op. The Update handler documents the same trap.
*/
$meta = Http::get_remote_object( $actor->guid, false );
if ( empty( $meta ) || ! \is_array( $meta ) || \is_wp_error( $meta ) ) {
Remote_Actors::add_error( $actor->ID, 'Failed to fetch or parse metadata' );
} else {
/*
* Only refresh when the remote still reports the same identity. A
* different (or missing) id means a Move or a malformed response;
* applying it would rewrite the cached guid in place and could
* collide with another cached actor, so leave the record alone.
* Updating by the known post ID otherwise refreshes it without the
* redundant get_by_uri() lookup upsert() would do.
*/
$fetched_id = isset( $meta['id'] ) && \is_string( $meta['id'] ) ? \esc_url_raw( $meta['id'] ) : '';
if ( $fetched_id !== $actor->guid ) {
/*
* Bump only the modified date, directly, so the skipped actor
* drops out of the outdated queue and is not re-fetched every
* run. A direct write avoids the save_post hooks wp_update_post()
* fires (which would needlessly clear the cached avatar); the
* record is intentionally left unchanged otherwise.
*/
global $wpdb;
$wpdb->update( // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
$wpdb->posts,
array(
'post_modified' => \current_time( 'mysql' ),
'post_modified_gmt' => \current_time( 'mysql', true ),
),
array( 'ID' => $actor->ID )
);
\clean_post_cache( $actor->ID );
continue;
}
$id = Remote_Actors::update( $actor->ID, $meta );
if ( \is_wp_error( $id ) ) {
continue;
}
Remote_Actors::clear_errors( $id );
}
}
}
/**
* Cleanup remote Actors.
*/
public static function cleanup_remote_actors() {
$number = 5;
if ( \defined( 'DISABLE_WP_CRON' ) && DISABLE_WP_CRON ) {
$number = 50;
}
/**
* Filter the number of remote Actors to clean up.
*
* @param int $number The number of remote Actors to clean up.
*/
$number = \apply_filters( 'activitypub_cleanup_remote_actors_number', $number );
$actors = Remote_Actors::get_faulty( $number );
foreach ( $actors as $actor ) {
$meta = get_remote_metadata_by_actor( $actor->guid, false );
if ( Tombstone::exists( $meta ) ) {
\wp_delete_post( $actor->ID );
} elseif ( empty( $meta ) || ! \is_array( $meta ) || \is_wp_error( $meta ) ) {
if ( Remote_Actors::count_errors( $actor->ID ) >= 5 ) {
\wp_schedule_single_event( \time(), 'activitypub_delete_remote_actor_interactions', array( $actor->guid ) );
\wp_schedule_single_event( \time(), 'activitypub_delete_remote_actor_posts', array( $actor->guid ) );
\wp_delete_post( $actor->ID );
} else {
Remote_Actors::add_error( $actor->ID, $meta );
}
} else {
$id = Remote_Actors::upsert( $meta );
if ( \is_wp_error( $id ) ) {
Remote_Actors::add_error( $actor->ID, $id );
} else {
Remote_Actors::clear_errors( $actor->ID );
}
}
}
}
/**
* Schedule the outbox item for federation.
*
* @param int $id The ID of the outbox item.
* @param int $offset The offset to add to the scheduled time. Default 3 seconds.
*/
public static function schedule_outbox_activity_for_federation( $id, $offset = 3 ) {
$hook = 'activitypub_process_outbox';
$args = array( $id );
if ( false === \wp_next_scheduled( $hook, $args ) ) {
\wp_schedule_single_event(
\time() + $offset,
$hook,
$args
);
}
}
/**
* Reprocess the outbox.
*/
public static function reprocess_outbox() {
$ids = \get_posts(
array(
'post_type' => Outbox::POST_TYPE,
'post_status' => 'pending',
'posts_per_page' => 10,
'fields' => 'ids',
)
);
foreach ( $ids as $id ) {
// Bail if there is a pending batch.
$offset = \get_post_meta( $id, '_activitypub_outbox_offset', true ) ?: 0; // phpcs:ignore
if ( self::has_scheduled_outbox_delivery_batch( $id, $offset ) ) {
return;
}
// Bail if there is a batch in progress.
$key = \md5( \serialize( $id ) ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.serialize_serialize
if ( self::is_locked( $key ) ) {
return;
}
self::schedule_outbox_activity_for_federation( $id );
}
}
/**
* Purge outbox items based on a schedule.
*/
public static function purge_outbox() {
Outbox::purge( \get_option( 'activitypub_outbox_purge_days', ACTIVITYPUB_OUTBOX_PURGE_DAYS ) );
}
/**
* Purge inbox items based on a schedule.
*/
public static function purge_inbox() {
Inbox::purge( \get_option( 'activitypub_inbox_purge_days', ACTIVITYPUB_INBOX_PURGE_DAYS ) );
}
/**
* Purge remote posts based on a schedule.
*/
public static function purge_ap_posts() {
Remote_Posts::purge( \get_option( 'activitypub_ap_post_purge_days', ACTIVITYPUB_AP_POST_PURGE_DAYS ) );
}
/**
* Daily cron handler that purges expired tombstones.
*
* Retention is non-urgent: large backlogs (e.g. after retention is first enforced)
* drain across multiple daily runs.
*
* @since 8.3.0
*/
public static function purge_tombstones() {
Tombstone::purge();
}
/**
* Process cached inbox activity.
*
* Retrieves all collected user IDs for an activity and processes them together.
*
* @param string $activity_id The activity ID.
*/
public static function process_inbox_activity( $activity_id ) {
// Deduplicate if multiple inbox items were created due to race condition.
$inbox_item = Inbox::deduplicate( $activity_id );
if ( ! $inbox_item ) {
return;
}
$data = \json_decode( $inbox_item->post_content, true );
// Reconstruct activity from inbox post.
$activity = Activity::init_from_array( $data );
$type = camel_to_snake_case( $activity->get_type() );
$context = Inbox::CONTEXT_INBOX;
$user_ids = Inbox::get_recipients( $inbox_item->ID );
/**
* Fires after any ActivityPub Inbox activity has been handled, regardless of activity type.
*
* This hook is triggered for all activity types processed by the inbox handler.
*
* @param array $data The data array.
* @param array $user_ids The user IDs.
* @param string $type The type of the activity.
* @param Activity $activity The Activity object.
* @param int $result The ID of the inbox item that was created, or WP_Error if failed.
* @param string $context The context of the request ('inbox' or 'shared_inbox').
*/
\do_action( 'activitypub_handled_inbox', $data, $user_ids, $type, $activity, $inbox_item->ID, $context );
/**
* Fires after an ActivityPub Inbox activity has been handled.
*
* @param array $data The data array.
* @param array $user_ids The user IDs.
* @param Activity $activity The Activity object.
* @param int $result The ID of the inbox item that was created, or WP_Error if failed.
* @param string $context The context of the request ('inbox' or 'shared_inbox').
*/
\do_action( 'activitypub_handled_inbox_' . $type, $data, $user_ids, $activity, $inbox_item->ID, $context );
}
/**
* Update schedules when outbox purge days settings change.
*
* @param int $old_value The old value.
* @param int $value The new value.
*/
public static function update_outbox_purge_schedule( $old_value, $value ) {
if ( 0 === (int) $value ) {
\wp_clear_scheduled_hook( 'activitypub_outbox_purge' );
} elseif ( ! \wp_next_scheduled( 'activitypub_outbox_purge' ) ) {
\wp_schedule_event( \time(), 'daily', 'activitypub_outbox_purge' );
}
}
/**
* Update schedules when inbox purge days settings change.
*
* @param int $old_value The old value.
* @param int $value The new value.
*/
public static function update_inbox_purge_schedule( $old_value, $value ) {
if ( 0 === (int) $value ) {
\wp_clear_scheduled_hook( 'activitypub_inbox_purge' );
} elseif ( ! \wp_next_scheduled( 'activitypub_inbox_purge' ) ) {
\wp_schedule_event( \time(), 'daily', 'activitypub_inbox_purge' );
}
}
/**
* Update schedules when remote posts purge days settings change.
*
* @param int $old_value The old value.
* @param int $value The new value.
*/
public static function update_ap_post_purge_schedule( $old_value, $value ) {
if ( 0 === (int) $value ) {
\wp_clear_scheduled_hook( 'activitypub_ap_post_purge' );
} elseif ( ! \wp_next_scheduled( 'activitypub_ap_post_purge' ) ) {
\wp_schedule_event( \time(), 'daily', 'activitypub_ap_post_purge' );
}
}
/**
* Asynchronously runs batch processing routines.
*
* The batching part is optional and only comes into play if the callback returns anything.
* Beyond that it's a helper to run a callback asynchronously with locking to prevent simultaneous processing.
*
* @params mixed ...$args Optional. Parameters that get passed to the callback.
*/
public static function async_batch() {
$args = \func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue
$callback = self::$batch_callbacks[ \current_action() ] ?? $args[0] ?? null;
if ( ! \is_callable( $callback ) ) {
\_doing_it_wrong( __METHOD__, 'There must be a valid callback associated with the current action.', '5.2.0' );
return;
}
$key = \md5( \serialize( $callback ) ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.serialize_serialize
// Bail if the existing lock is still valid.
if ( self::is_locked( $key ) ) {
\wp_schedule_single_event( \time() + MINUTE_IN_SECONDS, \current_action(), $args );
return;
}
self::lock( $key );
if ( \is_callable( $args[0] ?? null ) ) {
$callback = \array_shift( $args ); // Remove $callback from arguments.
}
$next = \call_user_func_array( $callback, $args );
self::unlock( $key );
if ( ! empty( $next ) ) {
// Schedule the next run, adding the result to the arguments.
\wp_schedule_single_event( \time() + self::get_retry_delay( \current_action() ), \current_action(), \array_values( $next ) );
}
}
/**
* Whether an outbox item already has a scheduled delivery batch at an offset.
*
* @param int $outbox_item_id The outbox item ID.
* @param int $offset The delivery offset.
*
* @return bool True when a matching delivery batch is scheduled.
*/
private static function has_scheduled_outbox_delivery_batch( $outbox_item_id, $offset ) {
return ! empty( self::get_scheduled_outbox_delivery_batches( $outbox_item_id, $offset ) );
}
/**
* Unschedule all pending delivery batches for an outbox item.
*
* @param int $outbox_item_id The outbox item ID.
*/
private static function unschedule_outbox_delivery_batches( $outbox_item_id ) {
foreach ( self::get_scheduled_outbox_delivery_batches( $outbox_item_id ) as $event ) {
\wp_unschedule_event( $event['timestamp'], 'activitypub_send_activity', $event['args'] );
}
}
/**
* Get scheduled delivery batches for an outbox item.
*
* The batch size is deliberately ignored because scheduled events may
* retain an older value after the admin changes the distribution mode.
*
* @param int $outbox_item_id The outbox item ID.
* @param int|null $offset Optional. Restrict results to this delivery offset.
*
* @return array Scheduled events with timestamp and args.
*/
private static function get_scheduled_outbox_delivery_batches( $outbox_item_id, $offset = null ) {
$events = array();
foreach ( \_get_cron_array() as $timestamp => $cron ) {
if ( empty( $cron['activitypub_send_activity'] ) ) {
continue;
}
foreach ( $cron['activitypub_send_activity'] as $event ) {
$args = $event['args'] ?? array();
if ( ! isset( $args[0] ) || (int) $outbox_item_id !== (int) $args[0] ) {
continue;
}
if ( null !== $offset && (int) ( $args[2] ?? 0 ) !== (int) $offset ) {
continue;
}
$events[] = array(
'timestamp' => $timestamp,
'args' => $args,
);
}
}
return $events;
}
/**
* Locks the async batch process for individual callbacks to prevent simultaneous processing.
*
* @param string $key Serialized callback name.
* @return bool|int True if the lock was successful, timestamp of existing lock otherwise.
*/
public static function lock( $key ) {
global $wpdb;
// Try to lock.
$lock_result = (bool) $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` ( `option_name`, `option_value`, `autoload` ) VALUES (%s, %s, 'no') /* LOCK */", 'activitypub_async_batch_' . $key, \time() ) ); // phpcs:ignore WordPress.DB
if ( ! $lock_result ) {
$lock_result = \get_option( 'activitypub_async_batch_' . $key );
}
return $lock_result;
}
/**
* Unlocks processing for the async batch callback.
*
* @param string $key Serialized callback name.
*/
public static function unlock( $key ) {
\delete_option( 'activitypub_async_batch_' . $key );
}
/**
* Whether the async batch callback is locked.
*
* @param string $key Serialized callback name.
* @return boolean
*/
public static function is_locked( $key ) {
$lock = \get_option( 'activitypub_async_batch_' . $key );
if ( ! $lock ) {
return false;
}
$lock = (int) $lock;
if ( $lock < \time() - 1800 ) {
self::unlock( $key );
return false;
}
return true;
}
/**
* Send announces.
*
* @param int $outbox_activity_id The outbox activity ID.
* @param Activity $activity The activity object.
* @param int $actor_id The actor ID.
* @param int $content_visibility The content visibility.
*/
public static function schedule_announce_activity( $outbox_activity_id, $activity, $actor_id, $content_visibility ) {
// Only if we're in both Blog and User modes.
if ( ACTIVITYPUB_ACTOR_AND_BLOG_MODE !== \get_option( 'activitypub_actor_mode', ACTIVITYPUB_ACTOR_MODE ) ) {
return;
}
// Only if this isn't the Blog Actor.
if ( Actors::BLOG_USER_ID === $actor_id ) {
return;
}
// Only if the content is public or quiet public.
if ( ACTIVITYPUB_CONTENT_VISIBILITY_PUBLIC !== $content_visibility ) {
return;
}
// Only if the activity is a Create.
if ( 'Create' !== $activity->get_type() ) {
return;
}
if ( ! \is_object( $activity->get_object() ) ) {
return;
}
// Check if the object is an article, image, audio, video, event, or document and ignore profile updates and other activities.
if ( ! \in_array( $activity->get_object()->get_type(), Base_Object::TYPES, true ) ) {
return;
}
$announce = new Activity();
$announce->set_type( 'Announce' );
$announce->set_actor( Actors::get_by_id( Actors::BLOG_USER_ID )->get_id() );
$announce->set_object( $activity );
$announce->add_cc( object_to_uri( $activity->get_actor() ) );
$outbox_activity_id = Outbox::add( $announce, Actors::BLOG_USER_ID );
if ( ! $outbox_activity_id ) {
return;
}
// Schedule the outbox item for federation.
self::schedule_outbox_activity_for_federation( $outbox_activity_id, 120 );
}
}