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<?php
/**
* WP REST Cache integration file.
*
* This file contains code for caching ActivityPub REST requests.
*
* Copyright (C) 2025 Epiphyt
* Original code: https://epiph.yt/en/blog/2025/accidental-ddos-through-activitypub-plugin/
*
* Portions of this code are adapted from GPL v2 licensed code.
* As such, you may also redistribute and/or modify those portions under the terms of
* the GNU General Public License as published by the Free Software Foundation.
*
* https://www.gnu.org/licenses/gpl-2.0.html
*
* @package Activitypub
*/
namespace Activitypub\Integration;
use Activitypub\Collection\Outbox;
use Activitypub\Comment;
use WP_Rest_Cache_Plugin\Includes\Caching\Caching;
/**
* Compatibility with the WP REST Cache plugin.
*
* @see https://wordpress.org/plugins/wp-rest-cache/
*/
class WP_Rest_Cache {
/**
* Initialize the class, registering WordPress hooks.
*/
public static function init() {
\add_filter( 'wp_rest_cache/allowed_endpoints', array( self::class, 'add_activitypub_endpoints' ) );
\add_filter( 'wp_rest_cache/determine_object_type', array( self::class, 'set_object_type' ), 10, 4 );
\add_filter( 'wp_rest_cache/is_single_item', array( self::class, 'set_is_single_item' ), 10, 3 );
\add_action( 'transition_post_status', array( self::class, 'transition_post_status' ), 10, 3 );
\add_action( 'transition_comment_status', array( self::class, 'transition_comment_status' ), 10, 3 );
}
/**
* Add ActivityPub endpoints to the list of allowed endpoints.
*
* @param array $endpoints List of allowed endpoints.
*
* @return array Filtered list of allowed endpoints.
*/
public static function add_activitypub_endpoints( $endpoints ) {
$endpoints[ ACTIVITYPUB_REST_NAMESPACE ] = array( 'actors', 'collections', 'comments', 'interactions', 'nodeinfo', 'posts', 'users' );
return $endpoints;
}
/**
* Set whether the cache represents a single item.
*
* Always return false for ActivityPub endpoints, since cache entries cannot be flushed otherwise.
*
* @param bool $is_single Whether the current cache represents a single item.
* @param mixed $data Data to cache.
* @param string $uri Request URI.
*
* @return bool Whether the cache represents a single item.
*/
public static function set_is_single_item( $is_single, $data, $uri ) {
if ( self::is_activitypub_endpoint( $uri ) ) {
return false;
}
return $is_single;
}
/**
* Set object type for ActivityPub.
*
* @param string $object_type Object type.
* @param string $cache_key Object key.
* @param mixed $data Data to cache.
* @param string $uri Request URI.
*
* @return string Updated object type.
*/
public static function set_object_type( $object_type, $cache_key, $data, $uri ) {
if ( self::is_activitypub_endpoint( $uri ) ) {
return 'ActivityPub';
}
return $object_type;
}
/**
* Reset cache by transition post status.
*
* @param string $new_status New post status.
* @param string $old_status Old post status.
* @param \WP_Post $post Post object.
*/
public static function transition_post_status( $new_status, $old_status, $post ) {
if ( 'publish' !== $new_status && 'publish' !== $old_status ) {
return;
}
$post_types = \get_option( 'activitypub_support_post_types', array() );
$post_types[] = Outbox::POST_TYPE;
if ( ! \in_array( $post->post_type, $post_types, true ) ) {
return;
}
Caching::get_instance()->delete_object_type_caches( 'ActivityPub' );
}
/**
* Reset cache by transition comment status.
*
* @param string $new_status The new comment status.
* @param string $old_status The old comment status.
* @param \WP_Comment $comment Comment object.
*/
public static function transition_comment_status( $new_status, $old_status, $comment ) {
if ( 'approved' !== $new_status && 'approved' !== $old_status ) {
return;
}
$comment_types = Comment::get_comment_type_slugs();
$comment_types[] = 'comment';
if ( ! \in_array( $comment->comment_type ?: 'comment', $comment_types, true ) ) {
return;
}
Caching::get_instance()->delete_object_type_caches( 'ActivityPub' );
}
/**
* Test, whether the current endpoint is an ActivityPub endpoint.
*
* @param string $uri URI to test.
*
* @return bool Whether the current endpoint is an ActivityPub endpoint.
*/
private static function is_activitypub_endpoint( $uri ) {
$search = '/' . ACTIVITYPUB_REST_NAMESPACE . '/';
return \str_contains( $uri, $search ) || \str_contains( $uri, 'rest_route=' . \rawurlencode( $search ) );
}
}