wordpress-activitypub/includes/handler/class-delete.php

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<?php
namespace Activitypub\Handler;
use WP_Error;
use WP_REST_Request;
use Activitypub\Http;
use Activitypub\Collection\Followers;
use Activitypub\Collection\Interactions;
/**
* Handles Delete requests.
*/
class Delete {
/**
* Initialize the class, registering WordPress hooks
*/
public static function init() {
\add_action(
'activitypub_inbox_delete',
array( self::class, 'handle_delete' )
);
// defer signature verification for `Delete` requests.
\add_filter(
'activitypub_defer_signature_verification',
array( self::class, 'defer_signature_verification' ),
10,
2
);
// side effect
\add_action(
'activitypub_delete_actor_interactions',
array( self::class, 'delete_interactions' )
);
}
/**
* Handles "Delete" requests.
*
* @param array $activity The delete activity.
* @param int $user_id The ID of the user performing the delete activity.
*/
public static function handle_delete( $activity ) {
$object_type = isset( $activity['object']['type'] ) ? $activity['object']['type'] : '';
switch ( $object_type ) {
// Actor Types
// @see https://www.w3.org/TR/activitystreams-vocabulary/#actor-types
case 'Person':
case 'Group':
case 'Organization':
case 'Service':
case 'Application':
self::maybe_delete_follower( $activity );
break;
// Object and Link Types
// @see https://www.w3.org/TR/activitystreams-vocabulary/#object-types
case 'Note':
case 'Article':
case 'Image':
case 'Audio':
case 'Video':
case 'Event':
case 'Document':
self::maybe_delete_interaction( $activity );
break;
// Tombstone Type
// @see: https://www.w3.org/TR/activitystreams-vocabulary/#dfn-tombstone
case 'Tombstone':
self::maybe_delete_interaction( $activity );
break;
// Minimal Activity
// @see https://www.w3.org/TR/activitystreams-core/#example-1
default:
// ignore non Minimal Activities.
if ( ! is_string( $activity['object'] ) ) {
return;
}
// check if Object is an Actor.
if ( $activity['actor'] === $activity['object'] ) {
self::maybe_delete_follower( $activity );
self::maybe_delete_interactions( $activity );
} else { // assume a interaction otherwise.
self::maybe_delete_interaction( $activity );
}
// maybe handle Delete Activity for other Object Types.
break;
}
}
/**
* Delete a Follower if Actor-URL is a Tombstone.
*
* @param array $activity The delete activity.
*/
public static function maybe_delete_follower( $activity ) {
$follower = Followers::get_follower_by_actor( $activity['actor'] );
// verify if Actor is deleted.
if ( $follower && Http::is_tombstone( $activity['actor'] ) ) {
$follower->delete();
}
}
/**
* Delete Reactions if Actor-URL is a Tombstone.
*
* @param array $activity The delete activity.
*/
public static function maybe_delete_interactions( $activity ) {
// verify if Actor is deleted.
if ( Http::is_tombstone( $activity['actor'] ) ) {
\wp_schedule_single_event(
\time(),
'activitypub_delete_actor_interactions',
array( $activity['actor'] )
);
}
}
/**
* Delete comments from an Actor.
*
* @param array $comments The comments to delete.
*/
public static function delete_interactions( $actor ) {
$comments = Interactions::get_interactions_by_actor( $actor );
if ( is_array( $comments ) ) {
foreach ( $comments as $comment ) {
wp_delete_comment( $comment->comment_ID );
}
}
}
/**
* Delete a Reaction if URL is a Tombstone.
*
* @param array $activity The delete activity.
*
* @return void
*/
public static function maybe_delete_interaction( $activity ) {
if ( is_array( $activity['object'] ) ) {
$id = $activity['object']['id'];
} else {
$id = $activity['object'];
}
$comments = Interactions::get_interaction_by_id( $id );
if ( $comments && Http::is_tombstone( $id ) ) {
foreach ( $comments as $comment ) {
wp_delete_comment( $comment->comment_ID, true );
}
}
}
/**
* Defer signature verification for `Delete` requests.
*
* @param bool $defer Whether to defer signature verification.
* @param WP_REST_Request $request The request object.
*
* @return bool Whether to defer signature verification.
*/
public static function defer_signature_verification( $defer, $request ) {
$json = $request->get_json_params();
if ( isset( $json['type'] ) && 'Delete' === $json['type'] ) {
return true;
}
return false;
}
}