activitypub / includes / rest / class-outbox-controller.php

class-outbox-controller.php in ActivityPub 9.0.1, at includes/rest/class-outbox-controller.php

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1	<?php
2	/**
3	* Outbox Controller file.
4	*
5	* @package Activitypub
6	*/
7
8	namespace Activitypub\Rest;
9
10	use Activitypub\Activity\Activity;
11	use Activitypub\Activity\Base_Object;
12	use Activitypub\Collection\Actors;
13	use Activitypub\Collection\Outbox;
14
15	use function Activitypub\add_to_outbox;
16	use function Activitypub\extract_recipients_from_activity;
17	use function Activitypub\get_masked_wp_version;
18	use function Activitypub\get_object_id;
19	use function Activitypub\get_rest_url_by_path;
20	use function Activitypub\object_to_uri;
21
22	/**
23	* ActivityPub Outbox Controller.
24	*
25	* @author Matthias Pfefferle
26	*
27	* @see https://www.w3.org/TR/activitypub/#outbox
28	*/
29	class Outbox_Controller extends \WP_REST_Controller {
30	use Collection;
31	use Event_Stream;
32	use Language_Map;
33	use Verification;
34
35	/**
36	* Activity types accessible as individual outbox items via REST.
37	*
38	* @var string[]
39	*/
40	const PUBLIC_ACTIVITY_TYPES = array( 'Announce', 'Arrive', 'Create', 'Like', 'Update' );
41
42	/**
43	* The namespace of this controller's route.
44	*
45	* @var string
46	*/
47	protected $namespace = ACTIVITYPUB_REST_NAMESPACE;
48
49	/**
50	* The base of this controller's route.
51	*
52	* @var string
53	*/
54	protected $rest_base = '(?:users\|actors)/(?P<user_id>[-]?\d+)/outbox';
55
56	/**
57	* Register routes.
58	*/
59	public function register_routes() {
60	\register_rest_route(
61	$this->namespace,
62	'/' . $this->rest_base,
63	array(
64	'args' => array(
65	'user_id' => array(
66	'description' => 'The ID of the user or actor.',
67	'type' => 'integer',
68	'validate_callback' => array( $this, 'validate_user_id' ),
69	),
70	),
71	array(
72	'methods' => \WP_REST_Server::READABLE,
73	'callback' => array( $this, 'get_items' ),
74	'permission_callback' => array( $this, 'verify_signature' ),
75	'args' => array(
76	'page' => array(
77	'description' => 'Current page of the collection.',
78	'type' => 'integer',
79	'minimum' => 1,
80	// No default so we can differentiate between Collection and CollectionPage requests.
81	),
82	'per_page' => array(
83	'description' => 'Maximum number of items to be returned in result set.',
84	'type' => 'integer',
85	'default' => 20,
86	'minimum' => 1,
87	'maximum' => 100,
88	),
89	),
90	),
91	array(
92	'methods' => \WP_REST_Server::CREATABLE,
93	'callback' => array( $this, 'create_item' ),
94	'permission_callback' => array( $this, 'verify_authentication' ),
95	),
96	'schema' => array( $this, 'get_item_schema' ),
97	)
98	);
99
100	\register_rest_route(
101	$this->namespace,
102	'/' . $this->rest_base . '/stream',
103	array(
104	'args' => array(
105	'user_id' => array(
106	'description' => 'The ID of the actor.',
107	'type' => 'integer',
108	'required' => true,
109	'validate_callback' => array( $this, 'validate_user_id' ),
110	),
111	),
112	array(
113	'methods' => \WP_REST_Server::READABLE,
114	'callback' => function ( $request ) {
115	$this->stream_collection( $request->get_param( 'user_id' ), 'outbox' );
116	},
117	'permission_callback' => array( $this, 'get_stream_permissions_check' ),
118	),
119	)
120	);
121
122	\add_filter( 'activitypub_rest_outbox_array', array( $this, 'overload_total_items' ), 10, 2 );
123	}
124
125	/**
126	* Validates the user_id parameter.
127	*
128	* @param mixed $user_id The user_id parameter.
129	* @return bool\|\WP_Error True if the user_id is valid, WP_Error otherwise.
130	*/
131	public function validate_user_id( $user_id ) {
132	$user = Actors::get_by_id( $user_id );
133	if ( \is_wp_error( $user ) ) {
134	return $user;
135	}
136
137	return true;
138	}
139
140	/**
141	* Retrieves a collection of outbox items.
142	*
143	* @param \WP_REST_Request $request Full details about the request.
144	* @return \WP_REST_Response\|\WP_Error Response object on success, or WP_Error object on failure.
145	*/
146	public function get_items( $request ) {
147	$page = $request->get_param( 'page' ) ?? 1;
148	$user_id = $request->get_param( 'user_id' );
149	$user = Actors::get_by_id( $user_id );
150
151	/**
152	* Action triggered prior to the ActivityPub profile being created and sent to the client.
153	*
154	* @param \WP_REST_Request $request The request object.
155	*/
156	\do_action( 'activitypub_rest_outbox_pre', $request );
157
158	/**
159	* Filters the activity types included in the outbox collection.
160	*
161	* @param string[] $activity_types The activity types.
162	*/
163	$activity_types = \apply_filters( 'activitypub_outbox_activity_types', self::PUBLIC_ACTIVITY_TYPES );
164
165	$args = array(
166	'posts_per_page' => $request->get_param( 'per_page' ),
167	'author' => $user_id > 0 ? $user_id : null,
168	'paged' => $page,
169	'post_type' => Outbox::POST_TYPE,
170	'post_status' => 'any',
171
172	// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
173	'meta_query' => array(
174	array(
175	'key' => '_activitypub_activity_actor',
176	'value' => Actors::get_type_by_id( $user_id ),
177	),
178	),
179	);
180
181	/*
182	* Whether the current user owns the outbox being queried. Owners see private and
183	* non-public activity types; unauthenticated, federation, and non-owner requests are
184	* limited to the public subset by the visibility filter below.
185	*
186	* Reuse the canonical ownership gate (the same check the OAuth C2S path applies via
187	* maybe_verify_owner()) instead of re-deriving it here: it requires an authenticated
188	* session, matches the requested user by identity, and handles the blog actor via
189	* user_can_act_as_blog(). A global capability never stands in for ownership.
190	*/
191	$is_outbox_owner = true === $this->verify_owner( $request );
192
193	if ( ! $is_outbox_owner ) {
194	$args['meta_query'][] = array(
195	'key' => '_activitypub_activity_type',
196	'value' => $activity_types,
197	'compare' => 'IN',
198	);
199
200	$args['meta_query'][] = array(
201	'relation' => 'OR',
202	array(
203	'key' => 'activitypub_content_visibility',
204	'compare' => 'NOT EXISTS',
205	),
206	array(
207	'key' => 'activitypub_content_visibility',
208	'value' => ACTIVITYPUB_CONTENT_VISIBILITY_PUBLIC,
209	),
210	);
211	}
212
213	/**
214	* Filters WP_Query arguments when querying Outbox items via the REST API.
215	*
216	* Enables adding extra arguments or setting defaults for an outbox collection request.
217	*
218	* @param array $args Array of arguments for WP_Query.
219	* @param \WP_REST_Request $request The REST API request.
220	*/
221	$args = \apply_filters( 'activitypub_rest_outbox_query', $args, $request );
222
223	$outbox_query = new \WP_Query();
224	$query_result = $outbox_query->query( $args );
225
226	$response = array(
227	'@context' => Base_Object::JSON_LD_CONTEXT,
228	'id' => get_rest_url_by_path( sprintf( 'actors/%d/outbox', $user_id ) ),
229	'generator' => 'https://wordpress.org/?v=' . get_masked_wp_version(),
230	'actor' => $user->get_id(),
231	'type' => 'OrderedCollection',
232	'totalItems' => (int) $outbox_query->found_posts,
233	'eventStream' => $this->get_stream_url( $user_id, 'outbox' ),
234	'orderedItems' => array(),
235	);
236
237	\update_postmeta_cache( \wp_list_pluck( $query_result, 'ID' ) );
238	foreach ( $query_result as $outbox_item ) {
239	if ( ! $outbox_item instanceof \WP_Post ) {
240	/**
241	* Action triggered when an outbox item is not a WP_Post.
242	*
243	* @param mixed $outbox_item The outbox item.
244	* @param array $args The arguments used to query the outbox.
245	* @param array $query_result The result of the query.
246	* @param \WP_REST_Request $request The request object.
247	*/
248	\do_action( 'activitypub_rest_outbox_item_error', $outbox_item, $args, $query_result, $request );
249
250	continue;
251	}
252
253	$item = $this->prepare_item_for_response( $outbox_item, $request );
254
255	if ( \is_wp_error( $item ) ) {
256	continue;
257	}
258
259	$response['orderedItems'][] = $item;
260	}
261
262	$response = $this->prepare_collection_response( $response, $request );
263	if ( \is_wp_error( $response ) ) {
264	return $response;
265	}
266
267	/**
268	* Filter the ActivityPub outbox array.
269	*
270	* @param array $response The ActivityPub outbox array.
271	* @param \WP_REST_Request $request The request object.
272	*/
273	$response = \apply_filters( 'activitypub_rest_outbox_array', $response, $request );
274
275	/**
276	* Action triggered after the ActivityPub profile has been created and sent to the client.
277	*
278	* @param \WP_REST_Request $request The request object.
279	*/
280	\do_action( 'activitypub_rest_outbox_post', $request );
281
282	$response = \rest_ensure_response( $response );
283	$response->header( 'Content-Type', 'application/activity+json; charset=' . \get_option( 'blog_charset' ) );
284
285	return $response;
286	}
287
288	/**
289	* Prepares the item for the REST response.
290	*
291	* @param mixed $item WordPress representation of the item.
292	* @param \WP_REST_Request $request Request object.
293	* @return array Response object on success, or WP_Error object on failure.
294	*/
295	public function prepare_item_for_response( $item, $request ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
296	$activity = Outbox::get_activity( $item->ID );
297
298	if ( \is_wp_error( $activity ) ) {
299	return $activity;
300	}
301
302	return $activity->to_array( false );
303	}
304
305	/**
306	* Retrieves the outbox schema, conforming to JSON Schema.
307	*
308	* @return array Collection schema data.
309	*/
310	public function get_item_schema() {
311	if ( $this->schema ) {
312	return $this->add_additional_fields_schema( $this->schema );
313	}
314
315	$item_schema = array(
316	'type' => 'object',
317	);
318
319	$schema = $this->get_collection_schema( $item_schema );
320
321	// Add outbox-specific properties.
322	$schema['title'] = 'outbox';
323	$schema['properties']['actor'] = array(
324	'description' => 'The actor who owns this outbox.',
325	'type' => 'string',
326	'format' => 'uri',
327	'required' => true,
328	);
329	$schema['properties']['generator'] = array(
330	'description' => 'The software used to generate the collection.',
331	'type' => 'string',
332	'format' => 'uri',
333	);
334
335	$this->schema = $schema;
336
337	return $this->add_additional_fields_schema( $this->schema );
338	}
339
340	/**
341	* Overload total items for public requests.
342	*
343	* For unauthenticated (public) requests, the `totalItems` property shows
344	* the overall number of federated posts and comments, which is what
345	* Mastodon expects for display purposes.
346	*
347	* For authenticated C2S requests, we skip this override so that totalItems
348	* accurately reflects the actual outbox collection size.
349	*
350	* @param array $response The response array.
351	* @param \WP_REST_Request $request The request object.
352	*
353	* @return array The modified response array.
354	*/
355	public function overload_total_items( $response, $request ) {
356	// For authenticated requests, return accurate totalItems matching orderedItems.
357	if ( \get_current_user_id() ) {
358	return $response;
359	}
360
361	$posts = new \WP_Query(
362	array(
363	'post_status' => 'publish',
364	'author' => $request->get_param( 'user_id' ),
365	// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
366	'meta_query' => array(
367	array(
368	'key' => 'activitypub_status',
369	'compare' => 'EXISTS',
370	),
371	),
372	'fields' => 'ids',
373	'no_found_rows' => false,
374	'number' => 1,
375	)
376	);
377
378	$user_id = (int) $request->get_param( 'user_id' );
379	$comments = new \WP_Comment_Query(
380	array(
381	'status' => 'approve',
382	'user_id' => $user_id,
383	// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key
384	'meta_key' => 'activitypub_status',
385	'fields' => 'ids',
386	'no_found_rows' => false,
387	'number' => 1,
388	'author__not_in' => array( 0 ),
389	)
390	);
391
392	$response['totalItems'] = (int) $posts->found_posts + (int) $comments->found_comments;
393
394	return $response;
395	}
396
397	/**
398	* Create an item in the outbox.
399	*
400	* Fires handlers via filter to process the activity. Handlers are responsible
401	* for calling add_to_outbox() and returning the outbox_id.
402	*
403	* @param \WP_REST_Request $request Full details about the request.
404	* @return \WP_REST_Response\|\WP_Error Response object on success, or WP_Error on failure.
405	*/
406	public function create_item( $request ) {
407	$user_id = $request->get_param( 'user_id' );
408	$user = Actors::get_by_id( $user_id );
409
410	if ( \is_wp_error( $user ) ) {
411	return $user;
412	}
413
414	$data = $request->get_json_params();
415
416	if ( empty( $data ) ) {
417	return new \WP_Error(
418	'activitypub_invalid_request',
419	\__( 'Request body must be a valid ActivityPub object or activity.', 'activitypub' ),
420	array( 'status' => 400 )
421	);
422	}
423
424	// Validate ownership - ensure submitted actor matches authenticated user.
425	$ownership_validation = $this->validate_ownership( $data, $user );
426	if ( \is_wp_error( $ownership_validation ) ) {
427	return $ownership_validation;
428	}
429
430	// Determine if this is an Activity or a bare Object.
431	$type = $data['type'] ?? '';
432	$is_activity = in_array( $type, Activity::TYPES, true );
433
434	// If it's a bare object, wrap it in a Create activity.
435	if ( ! $is_activity ) {
436	$data = $this->wrap_in_create( $data, $user );
437	}
438
439	// Resolve language maps (summaryMap, contentMap, nameMap) to plain strings.
440	$data = $this->localize_language_maps( $data );
441
442	// Default to public addressing if client omits recipients.
443	$data = $this->ensure_addressing( $data, $user );
444
445	// Determine visibility from addressing.
446	$visibility = $this->determine_visibility( $data );
447
448	$type = \strtolower( $data['type'] ?? 'create' );
449
450	// Validate type against known activity types to prevent hook name pollution.
451	$allowed_types = \array_map( 'strtolower', Activity::TYPES );
452	if ( ! \in_array( $type, $allowed_types, true ) ) {
453	$type = 'create';
454	}
455
456	/**
457	* Filters the activity to add to outbox.
458	*
459	* Handlers can process the activity and return:
460	* - WP_Post: A WordPress post was created (scheduler adds to outbox)
461	* - int: An outbox post ID (activity already added to outbox)
462	* - WP_Error: Stop processing and return error
463	* - false: Stop processing (activity not allowed)
464	* - array: Modified activity data (fallback to default handling)
465	* - Other: No handler processed the activity (fallback to default)
466	*
467	* @param array $data The activity data.
468	* @param int $user_id The user ID.
469	* @param string $visibility Content visibility.
470	*/
471	$result = \apply_filters( 'activitypub_outbox_' . $type, $data, $user_id, $visibility );
472
473	if ( \is_wp_error( $result ) ) {
474	return $result;
475	}
476
477	// Handler returned false to signal "not allowed" or "stop processing".
478	if ( false === $result ) {
479	return new \WP_Error(
480	'activitypub_activity_not_allowed',
481	\__( 'This activity type is not allowed.', 'activitypub' ),
482	array( 'status' => 403 )
483	);
484	}
485
486	$object_id = get_object_id( $result );
487
488	if ( $object_id ) {
489	// Handler returned a WP_Post or WP_Comment; look up its outbox entry.
490	$activity_type = \ucfirst( $data['type'] ?? 'Create' );
491	$outbox_item = Outbox::get_by_object_id( $object_id, $activity_type );
492	} elseif ( \is_int( $result ) && $result > 0 ) {
493	// Handler returned an outbox post ID directly.
494	$outbox_item = \get_post( $result );
495	} else {
496	// Default handling for raw activities.
497	$data = \is_array( $result ) ? $result : $data;
498	$data = $this->ensure_object_id( $data, $user );
499	$outbox_item = \get_post( add_to_outbox( $data, null, $user_id, $visibility ) );
500	}
501
502	if ( ! $outbox_item ) {
503	return new \WP_Error(
504	'activitypub_outbox_error',
505	\__( 'Failed to add activity to outbox.', 'activitypub' ),
506	array( 'status' => 500 )
507	);
508	}
509
510	// Get the stored activity.
511	$activity = Outbox::get_activity( $outbox_item );
512
513	if ( \is_wp_error( $activity ) ) {
514	return $activity;
515	}
516
517	$result = $activity->to_array( false );
518
519	// Return 201 Created with Location header.
520	$response = new \WP_REST_Response( $result, 201 );
521	$response->header( 'Location', $result['id'] ?? $outbox_item->guid );
522	$response->header( 'Content-Type', 'application/activity+json; charset=' . \get_option( 'blog_charset' ) );
523
524	return $response;
525	}
526
527	/**
528	* Wrap a bare object in a Create activity.
529	*
530	* @param array $object_data The object data.
531	* @param mixed $user The user/actor.
532	* @return array The wrapped Create activity.
533	*/
534	private function wrap_in_create( $object_data, $user ) {
535	// Copy addressing from object to activity.
536	$addressing = array();
537	foreach ( array( 'to', 'bto', 'cc', 'bcc', 'audience' ) as $field ) {
538	if ( ! empty( $object_data[ $field ] ) ) {
539	$addressing[ $field ] = $object_data[ $field ];
540	}
541	}
542
543	return array_merge(
544	array(
545	'@context' => Base_Object::JSON_LD_CONTEXT,
546	'type' => 'Create',
547	'actor' => $user->get_id(),
548	'object' => $object_data,
549	),
550	$addressing
551	);
552	}
553
554	/**
555	* Validate that activity actor matches the authenticated user.
556	*
557	* Ensures clients cannot submit activities with mismatched actor data.
558	*
559	* @param array $data The activity or object data.
560	* @param \Activitypub\Model\User\|null $user The authenticated user.
561	* @return true\|\WP_Error True if valid, WP_Error otherwise.
562	*/
563	private function validate_ownership( $data, $user ) {
564	if ( ! $user ) {
565	return new \WP_Error(
566	'activitypub_invalid_user',
567	\__( 'Invalid user.', 'activitypub' ),
568	array( 'status' => 400 )
569	);
570	}
571
572	$user_actor_id = $user->get_id();
573
574	// Check activity actor if present.
575	if ( ! empty( $data['actor'] ) ) {
576	$actor_id = object_to_uri( $data['actor'] );
577	if ( $actor_id && $actor_id !== $user_actor_id ) {
578	return new \WP_Error(
579	'activitypub_actor_mismatch',
580	\__( 'Activity actor does not match authenticated user.', 'activitypub' ),
581	array( 'status' => 403 )
582	);
583	}
584	}
585
586	// Check object.attributedTo if present.
587	$object = $data['object'] ?? $data;
588	if ( is_array( $object ) && ! empty( $object['attributedTo'] ) ) {
589	$attributed_to = object_to_uri( $object['attributedTo'] );
590	if ( $attributed_to && $attributed_to !== $user_actor_id ) {
591	return new \WP_Error(
592	'activitypub_attribution_mismatch',
593	\__( 'Object attributedTo does not match authenticated user.', 'activitypub' ),
594	array( 'status' => 403 )
595	);
596	}
597	}
598
599	return true;
600	}
601
602	/**
603	* Add default public addressing when the client omits recipients.
604	*
605	* Per the ActivityPub spec, the server adds addressing when the client
606	* does not provide it. Defaults to public with followers in cc.
607	*
608	* @since 8.1.0
609	*
610	* @param array $data The activity data.
611	* @param \Activitypub\Activity\Actor $user The authenticated user.
612	* @return array The activity data with addressing ensured.
613	*/
614	private function ensure_addressing( $data, $user ) {
615	$recipients = extract_recipients_from_activity( $data );
616
617	if ( ! empty( $recipients ) ) {
618	return $data;
619	}
620
621	$data['to'] = array( 'https://www.w3.org/ns/activitystreams#Public' );
622	$data['cc'] = array( $user->get_followers() );
623
624	return $data;
625	}
626
627	/**
628	* Determine content visibility from activity addressing.
629	*
630	* @param array $activity The activity data.
631	* @return string Visibility constant.
632	*/
633	private function determine_visibility( $activity ) {
634	$public = 'https://www.w3.org/ns/activitystreams#Public';
635	$to = (array) ( $activity['to'] ?? array() );
636	$cc = (array) ( $activity['cc'] ?? array() );
637
638	// Check if public.
639	if ( in_array( $public, $to, true ) ) {
640	return ACTIVITYPUB_CONTENT_VISIBILITY_PUBLIC;
641	}
642
643	// Check if unlisted (public in cc).
644	if ( in_array( $public, $cc, true ) ) {
645	return ACTIVITYPUB_CONTENT_VISIBILITY_QUIET_PUBLIC;
646	}
647
648	// Private (no public addressing).
649	return ACTIVITYPUB_CONTENT_VISIBILITY_PRIVATE;
650	}
651
652	/**
653	* Ensure the activity object has required fields.
654	*
655	* For C2S activities, clients may not provide all required fields.
656	* The server should fill in attributedTo and published, but object IDs
657	* should only be set by handlers that create WordPress content.
658	*
659	* @param array $data The activity data.
660	* @param \Activitypub\Model\User\|null $user The authenticated user.
661	* @return array The activity data with required fields ensured.
662	*/
663	private function ensure_object_id( $data, $user ) {
664	// Check if there's an embedded object that needs fields.
665	if ( ! isset( $data['object'] ) \|\| ! is_array( $data['object'] ) ) {
666	return $data;
667	}
668
669	$object = &$data['object'];
670
671	// Set attributedTo if missing.
672	if ( empty( $object['attributedTo'] ) && $user ) {
673	$object['attributedTo'] = $user->get_id();
674	}
675
676	// Set published if missing.
677	if ( empty( $object['published'] ) ) {
678	$object['published'] = \gmdate( 'Y-m-d\TH:i:s\Z' );
679	}
680
681	return $data;
682	}
683	}
684