activitypub / includes / class-query.php

class-query.php in ActivityPub 9.2.0, at includes/class-query.php

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1	<?php
2	/**
3	* Query class.
4	*
5	* @package Activitypub
6	*/
7
8	namespace Activitypub;
9
10	use Activitypub\Activity\Extended_Object\Feature_Authorization;
11	use Activitypub\Activity\Extended_Object\Quote_Authorization;
12	use Activitypub\Collection\Actors;
13	use Activitypub\Collection\Outbox;
14	use Activitypub\Handler\Feature_Request;
15	use Activitypub\Transformer\Factory;
16
17	/**
18	* Singleton class to handle and store the ActivityPub query.
19	*/
20	class Query {
21
22	/**
23	* The singleton instance.
24	*
25	* @var Query
26	*/
27	private static $instance;
28
29	/**
30	* The ActivityPub object.
31	*
32	* @link https://www.w3.org/TR/activitystreams-vocabulary/#dfn-object
33	*
34	* @var object
35	*/
36	private $activitypub_object;
37
38	/**
39	* The ActivityPub object ID.
40	*
41	* @link https://www.w3.org/TR/activitystreams-vocabulary/#dfn-id
42	*
43	* @var string
44	*/
45	private $activitypub_object_id;
46
47	/**
48	* Whether the current request is an ActivityPub request.
49	*
50	* @var bool
51	*/
52	private $is_activitypub_request;
53
54	/**
55	* Whether the current request is from the old host.
56	*
57	* @var bool
58	*/
59	private $is_old_host_request;
60
61	/**
62	* The constructor.
63	*/
64	private function __construct() {
65	// Do nothing.
66	}
67
68	/**
69	* The destructor.
70	*/
71	public function __destruct() {
72	self::$instance = null;
73	}
74
75	/**
76	* Get the singleton instance.
77	*
78	* @return Query The singleton instance.
79	*/
80	public static function get_instance() {
81	if ( ! isset( self::$instance ) ) {
82	self::$instance = new self();
83	}
84
85	return self::$instance;
86	}
87
88	/**
89	* Get the ActivityPub object.
90	*
91	* @return object The ActivityPub object.
92	*/
93	public function get_activitypub_object() {
94	if ( $this->activitypub_object ) {
95	return $this->activitypub_object;
96	}
97
98	if ( $this->prepare_activitypub_data() ) {
99	return $this->activitypub_object;
100	}
101
102	$queried_object = $this->get_queried_object();
103	$transformer = Factory::get_transformer( $queried_object );
104
105	if ( $transformer && ! \is_wp_error( $transformer ) ) {
106	$this->activitypub_object = $transformer->to_object();
107	}
108
109	return $this->activitypub_object;
110	}
111
112	/**
113	* Get the ActivityPub object ID.
114	*
115	* @return string The ActivityPub object ID.
116	*/
117	public function get_activitypub_object_id() {
118	if ( $this->activitypub_object_id ) {
119	return $this->activitypub_object_id;
120	}
121
122	if ( $this->prepare_activitypub_data() ) {
123	return $this->activitypub_object_id;
124	}
125
126	$queried_object = $this->get_queried_object();
127	$transformer = Factory::get_transformer( $queried_object );
128
129	if ( $transformer && ! \is_wp_error( $transformer ) ) {
130	$this->activitypub_object_id = $transformer->to_id();
131	}
132
133	return $this->activitypub_object_id;
134	}
135
136	/**
137	* Prepare and set both ActivityPub object and ID for Outbox activities and virtual objects.
138	*
139	* @return bool True if an object was found and set, false otherwise.
140	*/
141	private function prepare_activitypub_data() {
142	$queried_object = $this->get_queried_object();
143
144	if ( \get_query_var( 'stamp' ) ) {
145	if ( $queried_object instanceof \WP_Post ) {
146	return $this->maybe_get_stamp();
147	}
148
149	// Note: the blog actor's `actor` query var is '0', which is falsy but valid.
150	if ( $queried_object instanceof \WP_User \|\| '' !== \get_query_var( 'actor' ) ) {
151	return $this->maybe_get_actor_stamp();
152	}
153	}
154
155	// Check for Outbox Activity.
156	if (
157	$queried_object instanceof \WP_Post &&
158	Outbox::POST_TYPE === $queried_object->post_type
159	) {
160	$activitypub_object = Outbox::maybe_get_activity( $queried_object );
161
162	// Check if the Outbox Activity is public.
163	if ( ! \is_wp_error( $activitypub_object ) ) {
164	$this->activitypub_object = $activitypub_object;
165	$this->activitypub_object_id = $this->activitypub_object->get_id();
166	return true;
167	}
168	}
169
170	if ( ! $queried_object ) {
171	// If the object is not a valid ActivityPub object, try to get a virtual object.
172	$activitypub_object = $this->maybe_get_virtual_object();
173
174	if ( $activitypub_object ) {
175	$this->activitypub_object = $activitypub_object;
176	$this->activitypub_object_id = $this->activitypub_object->get_id();
177	return true;
178	}
179	}
180
181	return false;
182	}
183
184	/**
185	* Get the queried object.
186	*
187	* This adds support for Comments by `?c=123` IDs and Users by `?author=123` and `@username` IDs.
188	*
189	* @return \WP_Term\|\WP_Post_Type\|\WP_Post\|\WP_User\|\WP_Comment\|null The queried object.
190	*/
191	public function get_queried_object() {
192	$queried_object = \get_queried_object();
193
194	// Check Comment by ID.
195	if ( ! $queried_object ) {
196	$comment_id = \get_query_var( 'c' );
197	if ( $comment_id ) {
198	$queried_object = \get_comment( $comment_id );
199	}
200	}
201
202	// Check Post by ID (works for custom post types).
203	if ( ! $queried_object ) {
204	$post_id = \get_query_var( 'p' );
205	if ( $post_id ) {
206	$queried_object = \get_post( $post_id );
207	}
208	}
209
210	// Check Term by ID.
211	if ( ! $queried_object ) {
212	$term_id = \get_query_var( 'term_id' );
213	if ( $term_id ) {
214	$queried_object = \get_term( $term_id );
215	}
216	}
217
218	// Try to get Author by ID.
219	if ( ! $queried_object ) {
220	$url = $this->get_request_url();
221	$author_id = url_to_authorid( $url );
222	if ( $author_id ) {
223	$queried_object = \get_user_by( 'id', $author_id );
224	}
225	}
226
227	/**
228	* Filters the queried object.
229	*
230	* @param \WP_Term\|\WP_Post_Type\|\WP_Post\|\WP_User\|\WP_Comment\|null $queried_object The queried object.
231	*/
232	return \apply_filters( 'activitypub_queried_object', $queried_object );
233	}
234
235	/**
236	* Get the virtual object.
237	*
238	* Virtual objects are objects that are not stored in the database, but are created on the fly.
239	* The plugin currently supports one virtual object: The Blog-Actor.
240	*
241	* @see \Activitypub\Model\Blog
242	*
243	* @return object\|null The virtual object.
244	*/
245	protected function maybe_get_virtual_object() {
246	$url = $this->get_request_url();
247
248	if ( ! $url ) {
249	return null;
250	}
251
252	$author_id = url_to_authorid( $url );
253
254	if ( ! \is_numeric( $author_id ) ) {
255	$author_id = $url;
256	}
257
258	$user = Actors::get_by_various( $author_id );
259
260	if ( \is_wp_error( $user ) \|\| ! $user ) {
261	return null;
262	}
263
264	return $user;
265	}
266
267	/**
268	* Get the request URL.
269	*
270	* @return string\|null The request URL.
271	*/
272	public function get_request_url() {
273	if ( ! isset( $_SERVER['REQUEST_URI'] ) ) {
274	return null;
275	}
276
277	// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
278	$url = \wp_unslash( $_SERVER['REQUEST_URI'] );
279	$url = \WP_Http::make_absolute_url( $url, \home_url() );
280	$url = \sanitize_url( $url );
281
282	return $url;
283	}
284
285	/**
286	* Check if the current request is an ActivityPub request.
287	*
288	* @return bool True if the request is an ActivityPub request, false otherwise.
289	*/
290	public function is_activitypub_request() {
291	if ( ! isset( $this->is_activitypub_request ) ) {
292	global $wp_query;
293
294	$this->is_activitypub_request = false;
295
296	// One can trigger an ActivityPub request by adding `?activitypub` to the URL.
297	if ( isset( $wp_query->query_vars['activitypub'] ) \|\| isset( $_GET['activitypub'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
298	\defined( 'ACTIVITYPUB_REQUEST' ) \|\| \define( 'ACTIVITYPUB_REQUEST', true );
299	$this->is_activitypub_request = true;
300
301	// The other (more common) option to make an ActivityPub request is to send an Accept header.
302	} elseif ( isset( $_SERVER['HTTP_ACCEPT'] ) ) {
303	/*
304	* The Accept-header decision is delegated to is_json_only_accept() so the plugin and the
305	* Surge cache drop-in classify byte-for-byte identically. Both must hand it the same raw
306	* header, and they reach that raw form differently on purpose: this runs after
307	* wp_magic_quotes() has addslashed $_SERVER, so it wp_unslash()es to recover the original
308	* bytes; the drop-in runs before wp_magic_quotes() and passes its already-raw value
309	* untouched. Do NOT sanitize it (the drop-in can't, its sanitizers aren't loaded yet) and
310	* the helper must not stripslashes() either (that would corrupt the drop-in's genuine
311	* bytes). It is only used to pick a content type, never stored or echoed.
312	*
313	* The request is ActivityPub only when every media type is JSON; a client that also
314	* accepts HTML (e.g. a browser sending `text/html, application/activity+json`) gets the
315	* normal HTML page.
316	*/
317	// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Classified only; wp_unslash() recovers the raw bytes the pre-plugin cache path sees, and it must not be sanitized.
318	if ( is_json_only_accept( \wp_unslash( $_SERVER['HTTP_ACCEPT'] ) ) ) {
319	\defined( 'ACTIVITYPUB_REQUEST' ) \|\| \define( 'ACTIVITYPUB_REQUEST', true );
320	$this->is_activitypub_request = true;
321	}
322	}
323	}
324
325	/**
326	* Filters whether the current request is an ActivityPub request.
327	*
328	* @param bool $is_activitypub_request True if the request is an ActivityPub request, false otherwise.
329	*/
330	return \apply_filters( 'activitypub_is_activitypub_request', $this->is_activitypub_request );
331	}
332
333	/**
334	* Check if content negotiation is allowed for a request.
335	*
336	* @return bool True if content negotiation is allowed, false otherwise.
337	*/
338	public function should_negotiate_content() {
339	$return = false;
340	$always_negotiate = array( 'p', 'c', 'author', 'actor', 'stamp', 'preview', 'activitypub' );
341	$url = \wp_parse_url( $this->get_request_url(), PHP_URL_QUERY );
342	$query = array();
343	\wp_parse_str( $url, $query );
344
345	// Check if any of the query params are in the `$always_negotiate` array.
346	if ( \array_intersect( \array_keys( $query ), $always_negotiate ) ) {
347	$return = true;
348	}
349
350	if ( \get_option( 'activitypub_content_negotiation', '1' ) ) {
351	$return = true;
352	}
353
354	if ( \is_author() && \get_user_option( 'activitypub_use_permalink_as_id', \get_queried_object_id() ) ) {
355	$return = true;
356	}
357
358	/**
359	* Filters whether content negotiation should be forced.
360	*
361	* @param bool $return Whether content negotiation should be forced.
362	*/
363	return \apply_filters( 'activitypub_should_negotiate_content', $return );
364	}
365
366	/**
367	* Check if the current request is from the old host.
368	*
369	* @return bool True if the request is from the old host, false otherwise.
370	*/
371	public function is_old_host_request() {
372	if ( isset( $this->is_old_host_request ) ) {
373	return $this->is_old_host_request;
374	}
375
376	$old_host = \get_option( 'activitypub_old_host' );
377
378	if ( ! $old_host ) {
379	$this->is_old_host_request = false;
380	return false;
381	}
382
383	$request_host = isset( $_SERVER['HTTP_HOST'] ) ? \sanitize_text_field( \wp_unslash( $_SERVER['HTTP_HOST'] ) ) : '';
384	$referer_host = isset( $_SERVER['HTTP_REFERER'] ) ? \wp_parse_url( \sanitize_text_field( \wp_unslash( $_SERVER['HTTP_REFERER'] ) ), PHP_URL_HOST ) : '';
385
386	// Check if the domain matches either the request domain or referer.
387	$check = $old_host === $request_host \|\| $old_host === $referer_host;
388	$this->is_old_host_request = $check;
389
390	return $check;
391	}
392
393	/**
394	* Fake an old host request.
395	*
396	* @param bool $state Optional. The state to set. Default true.
397	*/
398	public function set_old_host_request( $state = true ) {
399	$this->is_old_host_request = $state;
400	}
401
402	/**
403	* Maybe get a QuoteAuthorization object from a stamp.
404	*
405	* @return bool True if the object was prepared, false otherwise.
406	*/
407	private function maybe_get_stamp() {
408	require_once ABSPATH . 'wp-admin/includes/post.php';
409
410	$stamp = \get_query_var( 'stamp' );
411	$meta = \get_post_meta_by_id( (int) $stamp );
412
413	if ( ! $meta ) {
414	return false;
415	}
416
417	$post = $this->get_queried_object();
418
419	/*
420	* Only quote-authorization meta may be reflected as a stamp, and only for the queried
421	* post. Checking the post id alone would still let an unauthenticated request read any
422	* of that post's meta rows (e.g. _edit_lock or private custom fields) by guessing a
423	* meta_id, so the meta key is verified too.
424	*/
425	if ( '_activitypub_quoted_by' !== $meta->meta_key \|\| (int) $meta->post_id !== $post->ID ) {
426	return false;
427	}
428
429	$user_uri = get_user_id( $post->post_author );
430
431	if ( ! $user_uri ) {
432	return false;
433	}
434
435	$stamp_uri = \add_query_arg(
436	array(
437	'p' => $post->ID,
438	'stamp' => $meta->meta_id,
439	),
440	\home_url( '/' )
441	);
442
443	$activitypub_object = new Quote_Authorization();
444	$activitypub_object->set_id( $stamp_uri );
445	$activitypub_object->set_attributed_to( $user_uri );
446	$activitypub_object->set_interacting_object( $meta->meta_value );
447	$activitypub_object->set_interaction_target( get_post_id( $post->ID ) );
448
449	$this->activitypub_object = $activitypub_object;
450	$this->activitypub_object_id = $activitypub_object->get_id();
451
452	return true;
453	}
454
455	/**
456	* Maybe get a FeatureAuthorization object from an actor-scoped stamp.
457	*
458	* Resolves URLs of the form `?actor=USER_ID&stamp=STAMP_ID` against the
459	* actor's stamp store, see {@see Feature_Request::get_stamp()}. Ownership
460	* is enforced by resolving the stamp scoped to the queried actor, which
461	* includes the blog actor (`actor=0`).
462	*
463	* @return bool True if a FeatureAuthorization was prepared, false otherwise.
464	*/
465	private function maybe_get_actor_stamp() {
466	$stamp_id = (int) \get_query_var( 'stamp' );
467	$actor_var = \get_query_var( 'actor' );
468
469	if ( ! $stamp_id ) {
470	return false;
471	}
472
473	if ( '' === $actor_var ) {
474	$queried = $this->get_queried_object();
475	if ( ! $queried instanceof \WP_User ) {
476	return false;
477	}
478
479	$actor_id = (int) $queried->ID;
480	} else {
481	// Values like '0e1' or '1.5' pass is_numeric() but cast to 0/1 and alias
482	// an actor, so require a plain decimal integer before casting.
483	if ( ! \ctype_digit( (string) $actor_var ) ) {
484	return false;
485	}
486
487	$actor_id = (int) $actor_var;
488	}
489
490	$instrument = Feature_Request::get_stamp( $actor_id, $stamp_id );
491	if ( null === $instrument ) {
492	return false;
493	}
494
495	$actor = Actors::get_by_id( $actor_id );
496	if ( \is_wp_error( $actor ) ) {
497	return false;
498	}
499
500	$stamp_url = \add_query_arg(
501	array(
502	'actor' => $actor_id,
503	'stamp' => $stamp_id,
504	),
505	\home_url( '/' )
506	);
507
508	$authorization = new Feature_Authorization();
509	$authorization->set_id( $stamp_url );
510	$authorization->set_attributed_to( $actor->get_id() );
511	$authorization->set_interacting_object( $instrument );
512	$authorization->set_interaction_target( $actor->get_id() );
513
514	$this->activitypub_object = $authorization;
515	$this->activitypub_object_id = $authorization->get_id();
516
517	return true;
518	}
519	}
520