activitypub / includes / handler / class-delete.php

class-delete.php in ActivityPub 7.0.1, at includes/handler/class-delete.php

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1	<?php
2	/**
3	* Delete handler file.
4	*
5	* @package Activitypub
6	*/
7
8	namespace Activitypub\Handler;
9
10	use Activitypub\Http;
11	use Activitypub\Collection\Actors;
12	use Activitypub\Collection\Interactions;
13
14	use function Activitypub\object_to_uri;
15
16	/**
17	* Handles Delete requests.
18	*/
19	class Delete {
20	/**
21	* Initialize the class, registering WordPress hooks.
22	*/
23	public static function init() {
24	\add_action( 'activitypub_inbox_delete', array( self::class, 'handle_delete' ) );
25	\add_filter( 'activitypub_defer_signature_verification', array( self::class, 'defer_signature_verification' ), 10, 2 );
26	\add_action( 'activitypub_delete_actor_interactions', array( self::class, 'delete_interactions' ) );
27	\add_filter( 'activitypub_get_outbox_activity', array( self::class, 'outbox_activity' ) );
28	}
29
30	/**
31	* Handles "Delete" requests.
32	*
33	* @param array $activity The delete activity.
34	*/
35	public static function handle_delete( $activity ) {
36	$object_type = $activity['object']['type'] ?? '';
37
38	switch ( $object_type ) {
39	/*
40	* Actor Types.
41	*
42	* @see https://www.w3.org/TR/activitystreams-vocabulary/#actor-types
43	*/
44	case 'Person':
45	case 'Group':
46	case 'Organization':
47	case 'Service':
48	case 'Application':
49	self::maybe_delete_follower( $activity );
50	break;
51
52	/*
53	* Object and Link Types.
54	*
55	* @see https://www.w3.org/TR/activitystreams-vocabulary/#object-types
56	*/
57	case 'Note':
58	case 'Article':
59	case 'Image':
60	case 'Audio':
61	case 'Video':
62	case 'Event':
63	case 'Document':
64	self::maybe_delete_interaction( $activity );
65	break;
66
67	/*
68	* Tombstone Type.
69	*
70	* @see: https://www.w3.org/TR/activitystreams-vocabulary/#dfn-tombstone
71	*/
72	case 'Tombstone':
73	self::maybe_delete_interaction( $activity );
74	break;
75
76	/*
77	* Minimal Activity.
78	*
79	* @see https://www.w3.org/TR/activitystreams-core/#example-1
80	*/
81	default:
82	// Ignore non Minimal Activities.
83	if ( ! is_string( $activity['object'] ) ) {
84	return;
85	}
86
87	// Check if Object is an Actor.
88	if ( $activity['actor'] === $activity['object'] ) {
89	self::maybe_delete_follower( $activity );
90	} else { // Assume an interaction otherwise.
91	self::maybe_delete_interaction( $activity );
92	}
93	// Maybe handle Delete Activity for other Object Types.
94	break;
95	}
96	}
97
98	/**
99	* Delete a Follower if Actor-URL is a Tombstone.
100	*
101	* @param array $activity The delete activity.
102	*/
103	public static function maybe_delete_follower( $activity ) {
104	$follower = Actors::get_remote_by_uri( $activity['actor'] );
105
106	// Verify that Actor is deleted.
107	if ( ! is_wp_error( $follower ) && Http::is_tombstone( $activity['actor'] ) ) {
108	Actors::delete( $follower->ID );
109	self::maybe_delete_interactions( $activity );
110	}
111	}
112
113	/**
114	* Delete Reactions if Actor-URL is a Tombstone.
115	*
116	* @param array $activity The delete activity.
117	*/
118	public static function maybe_delete_interactions( $activity ) {
119	// Verify that Actor is deleted.
120	if ( Http::is_tombstone( $activity['actor'] ) ) {
121	\wp_schedule_single_event(
122	\time(),
123	'activitypub_delete_actor_interactions',
124	array( $activity['actor'] )
125	);
126	}
127	}
128
129	/**
130	* Delete comments from an Actor.
131	*
132	* @param string $actor The URL of the actor whose comments to delete.
133	*/
134	public static function delete_interactions( $actor ) {
135	$comments = Interactions::get_interactions_by_actor( $actor );
136
137	foreach ( $comments as $comment ) {
138	wp_delete_comment( $comment, true );
139	}
140	}
141
142	/**
143	* Delete a Reaction if URL is a Tombstone.
144	*
145	* @param array $activity The delete activity.
146	*/
147	public static function maybe_delete_interaction( $activity ) {
148	if ( is_array( $activity['object'] ) ) {
149	$id = $activity['object']['id'];
150	} else {
151	$id = $activity['object'];
152	}
153
154	$comments = Interactions::get_interaction_by_id( $id );
155
156	if ( $comments && Http::is_tombstone( $id ) ) {
157	foreach ( $comments as $comment ) {
158	wp_delete_comment( $comment->comment_ID, true );
159	}
160	}
161	}
162
163	/**
164	* Defer signature verification for `Delete` requests.
165	*
166	* @param bool $defer Whether to defer signature verification.
167	* @param \WP_REST_Request $request The request object.
168	*
169	* @return bool Whether to defer signature verification.
170	*/
171	public static function defer_signature_verification( $defer, $request ) {
172	$json = $request->get_json_params();
173
174	if ( isset( $json['type'] ) && 'Delete' === $json['type'] ) {
175	return true;
176	}
177
178	return false;
179	}
180
181	/**
182	* Set the object to the object ID.
183	*
184	* @param \Activitypub\Activity\Activity $activity The Activity object.
185	* @return \Activitypub\Activity\Activity The filtered Activity object.
186	*/
187	public static function outbox_activity( $activity ) {
188	if ( 'Delete' === $activity->get_type() ) {
189	$activity->set_object( object_to_uri( $activity->get_object() ) );
190	}
191
192	return $activity;
193	}
194	}
195