2023-11-30 11:43:48 +01:00
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<?php
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namespace Activitypub\Handler;
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use WP_Error;
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use WP_REST_Request;
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use Activitypub\Http;
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use Activitypub\Collection\Followers;
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use Activitypub\Collection\Interactions;
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/**
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* Handles Delete requests.
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*/
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class Delete {
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/**
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* Initialize the class, registering WordPress hooks
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*/
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public static function init() {
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2023-12-22 17:45:27 +01:00
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\add_action(
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'activitypub_inbox_delete',
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array( self::class, 'handle_delete' )
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);
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2023-11-30 11:43:48 +01:00
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// defer signature verification for `Delete` requests.
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2023-12-22 17:45:27 +01:00
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\add_filter(
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'activitypub_defer_signature_verification',
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array( self::class, 'defer_signature_verification' ),
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10,
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2
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);
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2023-11-30 11:43:48 +01:00
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// side effect
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2023-12-22 17:45:27 +01:00
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\add_action(
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'activitypub_delete_actor_interactions',
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array( self::class, 'delete_interactions' )
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);
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2023-11-30 11:43:48 +01:00
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}
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/**
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* Handles "Delete" requests.
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*
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* @param array $activity The delete activity.
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* @param int $user_id The ID of the user performing the delete activity.
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*/
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2023-12-22 17:45:27 +01:00
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public static function handle_delete( $activity ) {
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2023-11-30 11:43:48 +01:00
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$object_type = isset( $activity['object']['type'] ) ? $activity['object']['type'] : '';
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switch ( $object_type ) {
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// Actor Types
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// @see https://www.w3.org/TR/activitystreams-vocabulary/#actor-types
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case 'Person':
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case 'Group':
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case 'Organization':
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case 'Service':
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case 'Application':
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2023-12-22 17:45:27 +01:00
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self::maybe_delete_follower( $activity );
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2023-11-30 11:43:48 +01:00
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break;
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// Object and Link Types
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// @see https://www.w3.org/TR/activitystreams-vocabulary/#object-types
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case 'Note':
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case 'Article':
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case 'Image':
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case 'Audio':
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case 'Video':
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case 'Event':
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case 'Document':
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self::maybe_delete_interaction( $activity );
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break;
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// Tombstone Type
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// @see: https://www.w3.org/TR/activitystreams-vocabulary/#dfn-tombstone
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case 'Tombstone':
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self::maybe_delete_interaction( $activity );
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break;
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// Minimal Activity
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// @see https://www.w3.org/TR/activitystreams-core/#example-1
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default:
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// ignore non Minimal Activities.
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if ( ! is_string( $activity['object'] ) ) {
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return;
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}
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// check if Object is an Actor.
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if ( $activity['actor'] === $activity['object'] ) {
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self::maybe_delete_follower( $activity );
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self::maybe_delete_interactions( $activity );
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} else { // assume a interaction otherwise.
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self::maybe_delete_interaction( $activity );
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}
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// maybe handle Delete Activity for other Object Types.
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break;
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}
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}
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/**
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* Delete a Follower if Actor-URL is a Tombstone.
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*
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* @param array $activity The delete activity.
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*/
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public static function maybe_delete_follower( $activity ) {
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$follower = Followers::get_follower_by_actor( $activity['actor'] );
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// verify if Actor is deleted.
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if ( $follower && Http::is_tombstone( $activity['actor'] ) ) {
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$follower->delete();
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}
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}
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/**
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* Delete Reactions if Actor-URL is a Tombstone.
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*
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* @param array $activity The delete activity.
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*/
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public static function maybe_delete_interactions( $activity ) {
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// verify if Actor is deleted.
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if ( Http::is_tombstone( $activity['actor'] ) ) {
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\wp_schedule_single_event(
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\time(),
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'activitypub_delete_actor_interactions',
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array( $activity['actor'] )
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);
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}
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}
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/**
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* Delete comments from an Actor.
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*
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* @param array $comments The comments to delete.
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*/
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public static function delete_interactions( $actor ) {
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$comments = Interactions::get_interactions_by_actor( $actor );
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if ( is_array( $comments ) ) {
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foreach ( $comments as $comment ) {
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wp_delete_comment( $comment->comment_ID );
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}
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}
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}
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/**
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* Delete a Reaction if URL is a Tombstone.
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*
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* @param array $activity The delete activity.
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*
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* @return void
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*/
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public static function maybe_delete_interaction( $activity ) {
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if ( is_array( $activity['object'] ) ) {
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$id = $activity['object']['id'];
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} else {
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$id = $activity['object'];
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}
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$comments = Interactions::get_interaction_by_id( $id );
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if ( $comments && Http::is_tombstone( $id ) ) {
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foreach ( $comments as $comment ) {
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wp_delete_comment( $comment->comment_ID, true );
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}
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}
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}
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/**
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* Defer signature verification for `Delete` requests.
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*
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* @param bool $defer Whether to defer signature verification.
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* @param WP_REST_Request $request The request object.
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*
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* @return bool Whether to defer signature verification.
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*/
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public static function defer_signature_verification( $defer, $request ) {
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$json = $request->get_json_params();
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if ( isset( $json['type'] ) && 'Delete' === $json['type'] ) {
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return true;
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}
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return false;
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}
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}
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