← All changes | includes/class-activitypub.php +413 -111 2.1.0 → 5.3.1 View file →

		@@ -1,20 +1,21 @@
1	1	<?php
	2	+/**
	3	+ * ActivityPub Class.
	4	+ *
	5	+ * @package Activitypub
	6	+ */
	7	+
2	8	namespace Activitypub;
3	9
4	10	use Exception;
5		-use Activitypub\Signature;
6		-use Activitypub\Collection\Users;
	11	+use Activitypub\Transformer\Factory;
	12	+use Activitypub\Collection\Outbox;
7	13	use Activitypub\Collection\Followers;
	14	+use Activitypub\Collection\Extra_Fields;
8	15
9		-use function Activitypub\is_comment;
10		-use function Activitypub\sanitize_url;
11		-use function Activitypub\is_local_comment;
12		-use function Activitypub\is_activitypub_request;
13		-use function Activitypub\should_comment_be_federated;
14		-
15	16	/**
16		- * ActivityPub Class
	17	+ * ActivityPub Class.
17	18	*
18	19	* @author Matthias Pfefferle
19	20	*/
20	21	class Activitypub {
		@@ -21,15 +22,16 @@
21	22	/**
22	23	* Initialize the class, registering WordPress hooks.
23	24	*/
24	25	public static function init() {
25		- \add_filter( 'template_include', array( self::class, 'render_json_template' ), 99 );
	26	+ \add_filter( 'template_include', array( self::class, 'render_activitypub_template' ), 99 );
26	27	\add_action( 'template_redirect', array( self::class, 'template_redirect' ) );
	28	+ \add_filter( 'redirect_canonical', array( self::class, 'redirect_canonical' ), 10, 2 );
27	29	\add_filter( 'query_vars', array( self::class, 'add_query_vars' ) );
28	30	\add_filter( 'pre_get_avatar_data', array( self::class, 'pre_get_avatar_data' ), 11, 2 );
29	31
30		- // Add support for ActivityPub to custom post types
31		- $post_types = \get_option( 'activitypub_support_post_types', array( 'post' ) ) ? \get_option( 'activitypub_support_post_types', array( 'post' ) ) : array();
	32	+ // Add support for ActivityPub to custom post types.
	33	+ $post_types = \get_option( 'activitypub_support_post_types', array( 'post' ) );
32	34
33	35	foreach ( $post_types as $post_type ) {
34	36	\add_post_type_support( $post_type, 'activitypub' );
35	37	}
		@@ -37,44 +39,84 @@
37	39	\add_action( 'wp_trash_post', array( self::class, 'trash_post' ), 1 );
38	40	\add_action( 'untrash_post', array( self::class, 'untrash_post' ), 1 );
39	41
40	42	\add_action( 'init', array( self::class, 'add_rewrite_rules' ), 11 );
	43	+ \add_action( 'init', array( self::class, 'theme_compat' ), 11 );
41	44
42		- \add_action( 'after_setup_theme', array( self::class, 'theme_compat' ), 99 );
	45	+ \add_action( 'user_register', array( self::class, 'user_register' ) );
43	46
44	47	\add_action( 'in_plugin_update_message-' . ACTIVITYPUB_PLUGIN_BASENAME, array( self::class, 'plugin_update_message' ) );
45	48
46		- // register several post_types
	49	+ if ( site_supports_blocks() ) {
	50	+ \add_action( 'tool_box', array( self::class, 'tool_box' ) );
	51	+ }
	52	+
	53	+ \add_filter( 'activitypub_get_actor_extra_fields', array( Extra_Fields::class, 'default_actor_extra_fields' ), 10, 2 );
	54	+
	55	+ \add_action( 'updated_postmeta', array( self::class, 'updated_postmeta' ), 10, 4 );
	56	+ \add_action( 'added_post_meta', array( self::class, 'updated_postmeta' ), 10, 4 );
	57	+
	58	+ // Register several post_types.
47	59	self::register_post_types();
48	60	}
49	61
50	62	/**
51		- * Activation Hook
52		- *
53		- * @return void
	63	+ * Activation Hook.
54	64	*/
55	65	public static function activate() {
56	66	self::flush_rewrite_rules();
57	67	Scheduler::register_schedules();
	68	+
	69	+ \add_filter( 'pre_wp_update_comment_count_now', array( Comment::class, 'pre_wp_update_comment_count_now' ), 10, 3 );
	70	+ Migration::update_comment_counts();
58	71	}
59	72
60	73	/**
61		- * Deactivation Hook
62		- *
63		- * @return void
	74	+ * Deactivation Hook.
64	75	*/
65	76	public static function deactivate() {
66	77	self::flush_rewrite_rules();
67	78	Scheduler::deregister_schedules();
	79	+
	80	+ \remove_filter( 'pre_wp_update_comment_count_now', array( Comment::class, 'pre_wp_update_comment_count_now' ) );
	81	+ Migration::update_comment_counts( 2000 );
68	82	}
69	83
70	84	/**
71		- * Uninstall Hook
72		- *
73		- * @return void
	85	+ * Uninstall Hook.
74	86	*/
75	87	public static function uninstall() {
76	88	Scheduler::deregister_schedules();
	89	+
	90	+ \remove_filter( 'pre_wp_update_comment_count_now', array( Comment::class, 'pre_wp_update_comment_count_now' ) );
	91	+ Migration::update_comment_counts( 2000 );
	92	+
	93	+ delete_option( 'activitypub_actor_mode' );
	94	+ delete_option( 'activitypub_attribution_domains' );
	95	+ delete_option( 'activitypub_authorized_fetch' );
	96	+ delete_option( 'activitypub_application_user_private_key' );
	97	+ delete_option( 'activitypub_application_user_public_key' );
	98	+ delete_option( 'activitypub_blog_user_private_key' );
	99	+ delete_option( 'activitypub_blog_user_public_key' );
	100	+ delete_option( 'activitypub_blog_description' );
	101	+ delete_option( 'activitypub_blog_identifier' );
	102	+ delete_option( 'activitypub_custom_post_content' );
	103	+ delete_option( 'activitypub_db_version' );
	104	+ delete_option( 'activitypub_default_extra_fields' );
	105	+ delete_option( 'activitypub_enable_blog_user' );
	106	+ delete_option( 'activitypub_enable_users' );
	107	+ delete_option( 'activitypub_header_image' );
	108	+ delete_option( 'activitypub_last_post_with_permalink_as_id' );
	109	+ delete_option( 'activitypub_mailer_new_follower' );
	110	+ delete_option( 'activitypub_mailer_new_dm' );
	111	+ delete_option( 'activitypub_max_image_attachments' );
	112	+ delete_option( 'activitypub_migration_lock' );
	113	+ delete_option( 'activitypub_object_type' );
	114	+ delete_option( 'activitypub_outbox_purge_days' );
	115	+ delete_option( 'activitypub_support_post_types' );
	116	+ delete_option( 'activitypub_use_hashtags' );
	117	+ delete_option( 'activitypub_use_opengraph' );
	118	+ delete_option( 'activitypub_use_permalink_as_id_for_blog' );
77	119	}
78	120
79	121	/**
80	122	* Return a AS2 JSON version of an author, post or page.
		@@ -82,51 +124,133 @@
82	124	* @param string $template The path to the template object.
83	125	*
84	126	* @return string The new path to the JSON template.
85	127	*/
86		- public static function render_json_template( $template ) {
	128	+ public static function render_activitypub_template( $template ) {
87	129	if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
88	130	return $template;
89	131	}
90	132
	133	+ self::add_headers();
	134	+
91	135	if ( ! is_activitypub_request() ) {
92	136	return $template;
93	137	}
94	138
95		- $json_template = false;
	139	+ $activitypub_template = false;
	140	+ $activitypub_object = Query::get_instance()->get_activitypub_object();
96	141
97		- // check if user can publish posts
98		- if ( \is_author() && is_wp_error( Users::get_by_id( \get_the_author_meta( 'ID' ) ) ) ) {
99		- return $template;
	142	+ if ( $activitypub_object ) {
	143	+ if ( \get_query_var( 'preview' ) ) {
	144	+ \define( 'ACTIVITYPUB_PREVIEW', true );
	145	+
	146	+ /**
	147	+ * Filter the template used for the ActivityPub preview.
	148	+ *
	149	+ * @param string $activitypub_template Absolute path to the template file.
	150	+ */
	151	+ $activitypub_template = apply_filters( 'activitypub_preview_template', ACTIVITYPUB_PLUGIN_DIR . '/templates/post-preview.php' );
	152	+ } else {
	153	+ $activitypub_template = ACTIVITYPUB_PLUGIN_DIR . 'templates/activitypub-json.php';
	154	+ }
100	155	}
101	156
102		- // check if blog-user is enabled
103		- if ( \is_home() && is_wp_error( Users::get_by_id( Users::BLOG_USER_ID ) ) ) {
104		- return $template;
	157	+ /*
	158	+ * Check if the request is authorized.
	159	+ *
	160	+ * @see https://www.w3.org/wiki/SocialCG/ActivityPub/Primer/Authentication_Authorization#Authorized_fetch
	161	+ * @see https://swicg.github.io/activitypub-http-signature/#authorized-fetch
	162	+ */
	163	+ if ( $activitypub_template && use_authorized_fetch() ) {
	164	+ $verification = Signature::verify_http_signature( $_SERVER );
	165	+ if ( \is_wp_error( $verification ) ) {
	166	+ header( 'HTTP/1.1 401 Unauthorized' );
	167	+
	168	+ // Fallback as template_loader can't return http headers.
	169	+ return $template;
	170	+ }
105	171	}
106	172
107		- if ( \is_author() ) {
108		- $json_template = ACTIVITYPUB_PLUGIN_DIR . '/templates/author-json.php';
109		- } elseif ( is_comment() ) {
110		- $json_template = ACTIVITYPUB_PLUGIN_DIR . '/templates/comment-json.php';
111		- } elseif ( \is_singular() ) {
112		- $json_template = ACTIVITYPUB_PLUGIN_DIR . '/templates/post-json.php';
113		- } elseif ( \is_home() ) {
114		- $json_template = ACTIVITYPUB_PLUGIN_DIR . '/templates/blog-json.php';
	173	+ if ( $activitypub_template ) {
	174	+ \set_query_var( 'is_404', false );
	175	+
	176	+ // Check if header already sent.
	177	+ if ( ! \headers_sent() ) {
	178	+ // Send 200 status header.
	179	+ \status_header( 200 );
	180	+ }
	181	+
	182	+ return $activitypub_template;
115	183	}
116	184
117		- if ( ACTIVITYPUB_AUTHORIZED_FETCH ) {
118		- $verification = Signature::verify_http_signature( $_SERVER );
119		- if ( \is_wp_error( $verification ) ) {
120		- // fallback as template_loader can't return http headers
121		- return $template;
	185	+ return $template;
	186	+ }
	187	+
	188	+ /**
	189	+ * Add the 'self' link to the header.
	190	+ */
	191	+ public static function add_headers() {
	192	+ $id = Query::get_instance()->get_activitypub_object_id();
	193	+
	194	+ if ( ! $id ) {
	195	+ return;
	196	+ }
	197	+
	198	+ if ( ! headers_sent() ) {
	199	+ \header( 'Link: <' . esc_url( $id ) . '>; title="ActivityPub (JSON)"; rel="alternate"; type="application/activity+json"', false );
	200	+
	201	+ if ( ACTIVITYPUB_SEND_VARY_HEADER ) {
	202	+ // Send Vary header for Accept header.
	203	+ \header( 'Vary: Accept', false );
122	204	}
123	205	}
124	206
125		- return $json_template;
	207	+ add_action(
	208	+ 'wp_head',
	209	+ function () use ( $id ) {
	210	+ echo PHP_EOL . '<link rel="alternate" title="ActivityPub (JSON)" type="application/activity+json" href="' . esc_url( $id ) . '" />' . PHP_EOL;
	211	+ }
	212	+ );
126	213	}
127	214
128	215	/**
	216	+ * Add support for `p` and `author` query vars.
	217	+ *
	218	+ * @param string $redirect_url The URL to redirect to.
	219	+ * @param string $requested_url The requested URL.
	220	+ *
	221	+ * @return string $redirect_url
	222	+ */
	223	+ public static function redirect_canonical( $redirect_url, $requested_url ) {
	224	+ if ( ! is_activitypub_request() ) {
	225	+ return $redirect_url;
	226	+ }
	227	+
	228	+ $query = \wp_parse_url( $requested_url, PHP_URL_QUERY );
	229	+
	230	+ if ( ! $query ) {
	231	+ return $redirect_url;
	232	+ }
	233	+
	234	+ $query_params = \wp_parse_args( $query );
	235	+ unset( $query_params['activitypub'] );
	236	+
	237	+ if ( 1 !== count( $query_params ) ) {
	238	+ return $redirect_url;
	239	+ }
	240	+
	241	+ if ( isset( $query_params['p'] ) ) {
	242	+ return null;
	243	+ }
	244	+
	245	+ if ( isset( $query_params['author'] ) ) {
	246	+ return null;
	247	+ }
	248	+
	249	+ return $requested_url;
	250	+ }
	251	+
	252	+ /**
129	253	* Custom redirects for ActivityPub requests.
130	254	*
131	255	* @return void
132	256	*/
		@@ -132,9 +256,9 @@
132	256	*/
133	257	public static function template_redirect() {
134	258	$comment_id = get_query_var( 'c', null );
135	259
136		- // check if it seems to be a comment
	260	+ // Check if it seems to be a comment.
137	261	if ( ! $comment_id ) {
138	262	return;
139	263	}
140	264
		@@ -139,9 +263,9 @@
139	263	}
140	264
141	265	$comment = get_comment( $comment_id );
142	266
143		- // load a 404 page if `c` is set but not valid
	267	+ // Load a 404 page if `c` is set but not valid.
144	268	if ( ! $comment ) {
145	269	global $wp_query;
146	270	$wp_query->set_404();
147	271	return;
		@@ -146,9 +270,9 @@
146	270	$wp_query->set_404();
147	271	return;
148	272	}
149	273
150		- // stop if it's not an ActivityPub comment
	274	+ // Stop if it's not an ActivityPub comment.
151	275	if ( is_activitypub_request() && ! is_local_comment( $comment ) ) {
152	276	return;
153	277	}
154	278
		@@ -157,11 +281,17 @@
157	281	}
158	282
159	283	/**
160	284	* Add the 'activitypub' query variable so WordPress won't mangle it.
	285	+ *
	286	+ * @param array $vars The query variables.
	287	+ *
	288	+ * @return array The query variables.
161	289	*/
162	290	public static function add_query_vars( $vars ) {
163	291	$vars[] = 'activitypub';
	292	+ $vars[] = 'preview';
	293	+ $vars[] = 'author';
164	294	$vars[] = 'c';
165	295	$vars[] = 'p';
166	296
167	297	return $vars;
		@@ -201,16 +331,18 @@
201	331	// Check if comment has an avatar.
202	332	$avatar = self::get_avatar_url( $id_or_email->comment_ID );
203	333
204	334	if ( $avatar ) {
205		- if ( ! isset( $args['class'] ) || ! \is_array( $args['class'] ) ) {
206		- $args['class'] = array( 'u-photo' );
207		- } else {
208		- $args['class'][] = 'u-photo';
209		- $args['class'] = \array_unique( $args['class'] );
	335	+ if ( empty( $args['class'] ) ) {
	336	+ $args['class'] = array();
	337	+ } elseif ( \is_string( $args['class'] ) ) {
	338	+ $args['class'] = \explode( ' ', $args['class'] );
210	339	}
	340	+
211	341	$args['url'] = $avatar;
212	342	$args['class'][] = 'avatar-activitypub';
	343	+ $args['class'][] = 'u-photo';
	344	+ $args['class'] = \array_unique( $args['class'] );
213	345	}
214	346
215	347	return $args;
216	348	}
		@@ -217,11 +349,11 @@
217	349
218	350	/**
219	351	* Function to retrieve Avatar URL if stored in meta.
220	352	*
221		- * @param int|WP_Comment $comment
	353	+ * @param int|\WP_Comment $comment The comment ID or object.
222	354	*
223		- * @return string $url
	355	+ * @return string The Avatar URL.
224	356	*/
225	357	public static function get_avatar_url( $comment ) {
226	358	if ( \is_numeric( $comment ) ) {
227	359	$comment = \get_comment( $comment );
		@@ -232,15 +364,13 @@
232	364	/**
233	365	* Store permalink in meta, to send delete Activity.
234	366	*
235	367	* @param string $post_id The Post ID.
236		- *
237		- * @return void
238	368	*/
239	369	public static function trash_post( $post_id ) {
240	370	\add_post_meta(
241	371	$post_id,
242		- 'activitypub_canonical_url',
	372	+ '_activitypub_canonical_url',
243	373	\get_permalink( $post_id ),
244	374	true
245	375	);
246	376	}
		@@ -245,24 +375,24 @@
245	375	);
246	376	}
247	377
248	378	/**
249		- * Delete permalink from meta
	379	+ * Delete permalink from meta.
250	380	*
251		- * @param string $post_id The Post ID
252		- *
253		- * @return void
	381	+ * @param string $post_id The Post ID.
254	382	*/
255	383	public static function untrash_post( $post_id ) {
256		- \delete_post_meta( $post_id, 'activitypub_canonical_url' );
	384	+ \delete_post_meta( $post_id, '_activitypub_canonical_url' );
257	385	}
258	386
259	387	/**
260		- * Add rewrite rules
	388	+ * Add rewrite rules.
261	389	*/
262	390	public static function add_rewrite_rules() {
263		- // If another system needs to take precedence over the ActivityPub rewrite rules,
264		- // they can define their own and will manually call the appropriate functions as required.
	391	+ /*
	392	+ * If another system needs to take precedence over the ActivityPub rewrite rules,
	393	+ * they can define their own and will manually call the appropriate functions as required.
	394	+ */
265	395	if ( ACTIVITYPUB_DISABLE_REWRITES ) {
266	396	return;
267	397	}
268	398
		@@ -276,21 +406,16 @@
276	406
277	407	if ( ! \class_exists( 'Nodeinfo_Endpoint' ) && true === (bool) \get_option( 'blog_public', 1 ) ) {
278	408	\add_rewrite_rule(
279	409	'^.well-known/nodeinfo',
280		- 'index.php?rest_route=/' . ACTIVITYPUB_REST_NAMESPACE . '/nodeinfo/discovery',
	410	+ 'index.php?rest_route=/' . ACTIVITYPUB_REST_NAMESPACE . '/nodeinfo',
281	411	'top'
282	412	);
283		- \add_rewrite_rule(
284		- '^.well-known/x-nodeinfo2',
285		- 'index.php?rest_route=/' . ACTIVITYPUB_REST_NAMESPACE . '/nodeinfo2',
286		- 'top'
287		- );
288	413	}
289	414
290	415	\add_rewrite_rule(
291		- '^@([\w\-\.]+)',
292		- 'index.php?rest_route=/' . ACTIVITYPUB_REST_NAMESPACE . '/users/$matches[1]',
	416	+ '^@([\w\-\.]+)$',
	417	+ 'index.php?rest_route=/' . ACTIVITYPUB_REST_NAMESPACE . '/actors/$matches[1]',
293	418	'top'
294	419	);
295	420
296	421	\add_rewrite_endpoint( 'activitypub', EP_AUTHORS | EP_PERMALINK | EP_PAGES );
		@@ -296,9 +421,9 @@
296	421	\add_rewrite_endpoint( 'activitypub', EP_AUTHORS | EP_PERMALINK | EP_PAGES );
297	422	}
298	423
299	424	/**
300		- * Flush rewrite rules;
	425	+ * Flush rewrite rules.
301	426	*/
302	427	public static function flush_rewrite_rules() {
303	428	self::add_rewrite_rules();
304	429	\flush_rewrite_rules();
		@@ -304,45 +429,42 @@
304	429	\flush_rewrite_rules();
305	430	}
306	431
307	432	/**
308		- * Theme compatibility stuff
309		- *
310		- * @return void
	433	+ * Adds metabox on wp-admin/tools.php.
311	434	*/
312		- public static function theme_compat() {
313		- $site_icon = get_theme_support( 'custom-logo' );
314		-
315		- if ( ! $site_icon ) {
316		- // custom logo support
317		- add_theme_support(
318		- 'custom-logo',
319		- array(
320		- 'height' => 80,
321		- 'width' => 80,
322		- )
323		- );
	435	+ public static function tool_box() {
	436	+ if ( \current_user_can( 'edit_posts' ) ) {
	437	+ \load_template( ACTIVITYPUB_PLUGIN_DIR . 'templates/toolbox.php' );
324	438	}
	439	+ }
325	440
326		- $custom_header = get_theme_support( 'custom-header' );
327		-
328		- if ( ! $custom_header ) {
329		- // This theme supports a custom header
330		- $custom_header_args = array(
331		- 'width' => 1250,
332		- 'height' => 600,
333		- 'header-text' => true,
334		- );
335		- add_theme_support( 'custom-header', $custom_header_args );
	441	+ /**
	442	+ * Theme compatibility stuff.
	443	+ */
	444	+ public static function theme_compat() {
	445	+ // We assume that you want to use Post-Formats when enabling the setting.
	446	+ if ( 'wordpress-post-format' === \get_option( 'activitypub_object_type', ACTIVITYPUB_DEFAULT_OBJECT_TYPE ) ) {
	447	+ if ( ! get_theme_support( 'post-formats' ) ) {
	448	+ // Add support for the Aside, Gallery Post Formats...
	449	+ add_theme_support(
	450	+ 'post-formats',
	451	+ array(
	452	+ 'gallery',
	453	+ 'status',
	454	+ 'image',
	455	+ 'video',
	456	+ 'audio',
	457	+ )
	458	+ );
	459	+ }
336	460	}
337	461	}
338	462
339	463	/**
340		- * Display plugin upgrade notice to users
	464	+ * Display plugin upgrade notice to users.
341	465	*
342		- * @param array $data The plugin data
343		- *
344		- * @return void
	466	+ * @param array $data The plugin data.
345	467	*/
346	468	public static function plugin_update_message( $data ) {
347	469	if ( ! isset( $data['upgrade_notice'] ) ) {
348	470	return;
		@@ -362,11 +484,9 @@
362	484	);
363	485	}
364	486
365	487	/**
366		- * Register the "Followers" Taxonomy
367		- *
368		- * @return void
	488	+ * Register Custom Post Types.
369	489	*/
370	490	private static function register_post_types() {
371	491	\register_post_type(
372	492	Followers::POST_TYPE,
		@@ -386,9 +506,9 @@
386	506	);
387	507
388	508	\register_post_meta(
389	509	Followers::POST_TYPE,
390		- 'activitypub_inbox',
	510	+ '_activitypub_inbox',
391	511	array(
392	512	'type' => 'string',
393	513	'single' => true,
394	514	'sanitize_callback' => 'sanitize_url',
		@@ -396,9 +516,9 @@
396	516	);
397	517
398	518	\register_post_meta(
399	519	Followers::POST_TYPE,
400		- 'activitypub_errors',
	520	+ '_activitypub_errors',
401	521	array(
402	522	'type' => 'string',
403	523	'single' => false,
404	524	'sanitize_callback' => function ( $value ) {
		@@ -412,9 +532,9 @@
412	532	);
413	533
414	534	\register_post_meta(
415	535	Followers::POST_TYPE,
416		- 'activitypub_user_id',
	536	+ '_activitypub_user_id',
417	537	array(
418	538	'type' => 'string',
419	539	'single' => false,
420	540	'sanitize_callback' => function ( $value ) {
		@@ -424,9 +544,9 @@
424	544	);
425	545
426	546	\register_post_meta(
427	547	Followers::POST_TYPE,
428		- 'activitypub_actor_json',
	548	+ '_activitypub_actor_json',
429	549	array(
430	550	'type' => 'string',
431	551	'single' => true,
432	552	'sanitize_callback' => function ( $value ) {
		@@ -434,7 +554,189 @@
434	554	},
435	555	)
436	556	);
437	557
	558	+ // Register Outbox Post-Type.
	559	+ register_post_type(
	560	+ Outbox::POST_TYPE,
	561	+ array(
	562	+ 'labels' => array(
	563	+ 'name' => _x( 'Outbox', 'post_type plural name', 'activitypub' ),
	564	+ 'singular_name' => _x( 'Outbox Item', 'post_type single name', 'activitypub' ),
	565	+ ),
	566	+ 'capabilities' => array(
	567	+ 'create_posts' => false,
	568	+ ),
	569	+ 'map_meta_cap' => true,
	570	+ 'public' => false,
	571	+ 'show_in_rest' => true,
	572	+ 'rewrite' => false,
	573	+ 'query_var' => false,
	574	+ 'supports' => array( 'title', 'editor', 'author', 'custom-fields' ),
	575	+ 'delete_with_user' => true,
	576	+ 'can_export' => true,
	577	+ 'exclude_from_search' => true,
	578	+ )
	579	+ );
	580	+
	581	+ /**
	582	+ * Register Activity Type meta for Outbox items.
	583	+ *
	584	+ * @see https://www.w3.org/TR/activitystreams-vocabulary/#activity-types
	585	+ */
	586	+ \register_post_meta(
	587	+ Outbox::POST_TYPE,
	588	+ '_activitypub_activity_type',
	589	+ array(
	590	+ 'type' => 'string',
	591	+ 'description' => 'The type of the activity',
	592	+ 'single' => true,
	593	+ 'show_in_rest' => true,
	594	+ 'sanitize_callback' => function ( $value ) {
	595	+ $value = ucfirst( strtolower( $value ) );
	596	+ $schema = array(
	597	+ 'type' => 'string',
	598	+ 'enum' => array( 'Accept', 'Add', 'Announce', 'Arrive', 'Block', 'Create', 'Delete', 'Dislike', 'Flag', 'Follow', 'Ignore', 'Invite', 'Join', 'Leave', 'Like', 'Listen', 'Move', 'Offer', 'Question', 'Reject', 'Read', 'Remove', 'TentativeReject', 'TentativeAccept', 'Travel', 'Undo', 'Update', 'View' ),
	599	+ 'default' => 'Announce',
	600	+ );
	601	+
	602	+ if ( is_wp_error( rest_validate_enum( $value, $schema, '' ) ) ) {
	603	+ return $schema['default'];
	604	+ }
	605	+
	606	+ return $value;
	607	+ },
	608	+ )
	609	+ );
	610	+
	611	+ \register_post_meta(
	612	+ Outbox::POST_TYPE,
	613	+ '_activitypub_activity_actor',
	614	+ array(
	615	+ 'type' => 'string',
	616	+ 'single' => true,
	617	+ 'show_in_rest' => true,
	618	+ 'sanitize_callback' => function ( $value ) {
	619	+ $schema = array(
	620	+ 'type' => 'string',
	621	+ 'enum' => array( 'application', 'blog', 'user' ),
	622	+ 'default' => 'user',
	623	+ );
	624	+
	625	+ if ( is_wp_error( rest_validate_enum( $value, $schema, '' ) ) ) {
	626	+ return $schema['default'];
	627	+ }
	628	+
	629	+ return $value;
	630	+ },
	631	+ )
	632	+ );
	633	+
	634	+ \register_post_meta(
	635	+ Outbox::POST_TYPE,
	636	+ '_activitypub_outbox_offset',
	637	+ array(
	638	+ 'type' => 'integer',
	639	+ 'single' => true,
	640	+ 'description' => 'Keeps track of the followers offset when processing outbox items.',
	641	+ 'sanitize_callback' => 'absint',
	642	+ 'default' => 0,
	643	+ )
	644	+ );
	645	+
	646	+ \register_post_meta(
	647	+ Outbox::POST_TYPE,
	648	+ '_activitypub_object_id',
	649	+ array(
	650	+ 'type' => 'string',
	651	+ 'single' => true,
	652	+ 'description' => 'The ID (ActivityPub URI) of the object that the outbox item is about.',
	653	+ 'sanitize_callback' => 'sanitize_url',
	654	+ )
	655	+ );
	656	+
	657	+ \register_post_meta(
	658	+ Outbox::POST_TYPE,
	659	+ 'activitypub_content_visibility',
	660	+ array(
	661	+ 'type' => 'string',
	662	+ 'single' => true,
	663	+ 'show_in_rest' => true,
	664	+ 'sanitize_callback' => function ( $value ) {
	665	+ $schema = array(
	666	+ 'type' => 'string',
	667	+ 'enum' => array( ACTIVITYPUB_CONTENT_VISIBILITY_PUBLIC, ACTIVITYPUB_CONTENT_VISIBILITY_QUIET_PUBLIC, ACTIVITYPUB_CONTENT_VISIBILITY_PRIVATE, ACTIVITYPUB_CONTENT_VISIBILITY_LOCAL ),
	668	+ 'default' => ACTIVITYPUB_CONTENT_VISIBILITY_PUBLIC,
	669	+ );
	670	+
	671	+ if ( is_wp_error( rest_validate_enum( $value, $schema, '' ) ) ) {
	672	+ return $schema['default'];
	673	+ }
	674	+
	675	+ return $value;
	676	+ },
	677	+ )
	678	+ );
	679	+
	680	+ // Both User and Blog Extra Fields types have the same args.
	681	+ $args = array(
	682	+ 'labels' => array(
	683	+ 'name' => _x( 'Extra fields', 'post_type plural name', 'activitypub' ),
	684	+ 'singular_name' => _x( 'Extra field', 'post_type single name', 'activitypub' ),
	685	+ 'add_new' => __( 'Add new', 'activitypub' ),
	686	+ 'add_new_item' => __( 'Add new extra field', 'activitypub' ),
	687	+ 'new_item' => __( 'New extra field', 'activitypub' ),
	688	+ 'edit_item' => __( 'Edit extra field', 'activitypub' ),
	689	+ 'view_item' => __( 'View extra field', 'activitypub' ),
	690	+ 'all_items' => __( 'All extra fields', 'activitypub' ),
	691	+ ),
	692	+ 'public' => false,
	693	+ 'hierarchical' => false,
	694	+ 'query_var' => false,
	695	+ 'has_archive' => false,
	696	+ 'publicly_queryable' => false,
	697	+ 'show_in_menu' => false,
	698	+ 'delete_with_user' => true,
	699	+ 'can_export' => true,
	700	+ 'exclude_from_search' => true,
	701	+ 'show_in_rest' => true,
	702	+ 'map_meta_cap' => true,
	703	+ 'show_ui' => true,
	704	+ 'supports' => array( 'title', 'editor', 'page-attributes' ),
	705	+ );
	706	+
	707	+ \register_post_type( Extra_Fields::USER_POST_TYPE, $args );
	708	+ \register_post_type( Extra_Fields::BLOG_POST_TYPE, $args );
	709	+
	710	+ /**
	711	+ * Fires after ActivityPub custom post types have been registered.
	712	+ */
438	713	\do_action( 'activitypub_after_register_post_type' );
	714	+ }
	715	+
	716	+ /**
	717	+ * Add the 'activitypub' capability to users who can publish posts.
	718	+ *
	719	+ * @param int $user_id User ID.
	720	+ */
	721	+ public static function user_register( $user_id ) {
	722	+ if ( \user_can( $user_id, 'publish_posts' ) ) {
	723	+ $user = \get_user_by( 'id', $user_id );
	724	+ $user->add_cap( 'activitypub' );
	725	+ }
	726	+ }
	727	+
	728	+ /**
	729	+ * Delete `activitypub_content_visibility` when updated to an empty value.
	730	+ *
	731	+ * @param int $meta_id ID of updated metadata entry.
	732	+ * @param int $object_id Post ID.
	733	+ * @param string $meta_key Metadata key.
	734	+ * @param mixed $meta_value Metadata value. This will be a PHP-serialized string representation of the value
	735	+ * if the value is an array, an object, or itself a PHP-serialized string.
	736	+ */
	737	+ public static function updated_postmeta( $meta_id, $object_id, $meta_key, $meta_value ) {
	738	+ if ( 'activitypub_content_visibility' === $meta_key && empty( $meta_value ) ) {
	739	+ \delete_post_meta( $object_id, 'activitypub_content_visibility' );
	740	+ }
439	741	}
440	742	}