activitypub / includes / functions.php

functions.php in ActivityPub 0.9.0, at includes/functions.php

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1	<?php
2	namespace Activitypub;
3
4	/**
5	* Returns the ActivityPub default JSON-context
6	*
7	* @return array the activitypub context
8	*/
9	function get_context() {
10	$context = array(
11	'https://www.w3.org/ns/activitystreams',
12	'https://w3id.org/security/v1',
13	array(
14	'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
15	'PropertyValue' => 'schema:PropertyValue',
16	'schema' => 'http://schema.org#',
17	'value' => 'schema:value',
18	),
19	);
20
21	return \apply_filters( 'activitypub_json_context', $context );
22	}
23
24	function safe_remote_post( $url, $body, $user_id ) {
25	$date = \gmdate( 'D, d M Y H:i:s T' );
26	$signature = \Activitypub\Signature::generate_signature( $user_id, $url, $date );
27
28	$wp_version = \get_bloginfo( 'version' );
29	$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
30	$args = array(
31	'timeout' => 100,
32	'limit_response_size' => 1048576,
33	'redirection' => 3,
34	'user-agent' => "$user_agent; ActivityPub",
35	'headers' => array(
36	'Accept' => 'application/activity+json',
37	'Content-Type' => 'application/activity+json',
38	'Signature' => $signature,
39	'Date' => $date,
40	),
41	'body' => $body,
42	);
43
44	$response = \wp_safe_remote_post( $url, $args );
45
46	\do_action( 'activitypub_safe_remote_post_response', $response, $url, $body, $user_id );
47
48	return $response;
49	}
50
51	/**
52	* Returns a users WebFinger "resource"
53	*
54	* @param int $user_id
55	*
56	* @return string The user-resource
57	*/
58	function get_webfinger_resource( $user_id ) {
59	// use WebFinger plugin if installed
60	if ( \function_exists( '\get_webfinger_resource' ) ) {
61	return \get_webfinger_resource( $user_id, false );
62	}
63
64	$user = \get_user_by( 'id', $user_id );
65
66	return $user->user_login . '@' . \wp_parse_url( \home_url(), PHP_URL_HOST );
67	}
68
69	/**
70	* [get_metadata_by_actor description]
71	*
72	* @param sting $actor
73	*
74	* @return array
75	*/
76	function get_remote_metadata_by_actor( $actor ) {
77	$metadata = \get_transient( 'activitypub_' . $actor );
78
79	if ( $metadata ) {
80	return $metadata;
81	}
82
83	if ( ! \wp_http_validate_url( $actor ) ) {
84	return new \WP_Error( 'activitypub_no_valid_actor_url', \__( 'The "actor" is no valid URL', 'activitypub' ), $actor );
85	}
86
87	$wp_version = \get_bloginfo( 'version' );
88
89	$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
90	$args = array(
91	'timeout' => 100,
92	'limit_response_size' => 1048576,
93	'redirection' => 3,
94	'user-agent' => "$user_agent; ActivityPub",
95	'headers' => array(
96	'accept' => 'application/activity+json, application/ld+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
97	),
98	);
99
100	$response = \wp_safe_remote_get( $actor, $args );
101
102	if ( \is_wp_error( $response ) ) {
103	return $response;
104	}
105
106	$metadata = \wp_remote_retrieve_body( $response );
107	$metadata = \json_decode( $metadata, true );
108
109	if ( ! $metadata ) {
110	return new \WP_Error( 'activitypub_invalid_json', \__( 'No valid JSON data', 'activitypub' ), $actor );
111	}
112
113	\set_transient( 'activitypub_' . $actor, $metadata, WEEK_IN_SECONDS );
114
115	return $metadata;
116	}
117
118	/**
119	* [get_inbox_by_actor description]
120	* @param [type] $actor [description]
121	* @return [type] [description]
122	*/
123	function get_inbox_by_actor( $actor ) {
124	$metadata = \Activitypub\get_remote_metadata_by_actor( $actor );
125
126	if ( \is_wp_error( $metadata ) ) {
127	return $metadata;
128	}
129
130	if ( isset( $metadata['endpoints'] ) && isset( $metadata['endpoints']['sharedInbox'] ) ) {
131	return $metadata['endpoints']['sharedInbox'];
132	}
133
134	if ( \array_key_exists( 'inbox', $metadata ) ) {
135	return $metadata['inbox'];
136	}
137
138	return new \WP_Error( 'activitypub_no_inbox', __( 'No "Inbox" found', 'activitypub' ), $metadata );
139	}
140
141	/**
142	* [get_inbox_by_actor description]
143	* @param [type] $actor [description]
144	* @return [type] [description]
145	*/
146	function get_publickey_by_actor( $actor, $key_id ) {
147	$metadata = \Activitypub\get_remote_metadata_by_actor( $actor );
148
149	if ( \is_wp_error( $metadata ) ) {
150	return $metadata;
151	}
152
153	if (
154	isset( $metadata['publicKey'] ) &&
155	isset( $metadata['publicKey']['id'] ) &&
156	isset( $metadata['publicKey']['owner'] ) &&
157	isset( $metadata['publicKey']['publicKeyPem'] ) &&
158	$key_id === $metadata['publicKey']['id'] &&
159	$actor === $metadata['publicKey']['owner']
160	) {
161	return $metadata['publicKey']['publicKeyPem'];
162	}
163
164	return new \WP_Error( 'activitypub_no_public_key', \__( 'No "Public-Key" found', 'activitypub' ), $metadata );
165	}
166
167	function get_follower_inboxes( $user_id ) {
168	$followers = \Activitypub\Peer\Followers::get_followers( $user_id );
169	$inboxes = array();
170
171	foreach ( $followers as $follower ) {
172	$inbox = \Activitypub\get_inbox_by_actor( $follower );
173	if ( ! $inbox \|\| \is_wp_error( $inbox ) ) {
174	continue;
175	}
176	// init array if empty
177	if ( ! isset( $inboxes[ $inbox ] ) ) {
178	$inboxes[ $inbox ] = array();
179	}
180	$inboxes[ $inbox ][] = $follower;
181	}
182
183	return $inboxes;
184	}
185
186	function get_identifier_settings( $user_id ) {
187	?>
188	<table class="form-table">
189	<tbody>
190	<tr>
191	<th scope="row">
192	<label><?php \esc_html_e( 'Profile identifier', 'activitypub' ); ?></label>
193	</th>
194	<td>
195	<p><code><?php echo \esc_html( \Activitypub\get_webfinger_resource( $user_id ) ); ?></code> or <code><?php echo \esc_url( \get_author_posts_url( $user_id ) ); ?></code></p>
196	<?php // translators: the webfinger resource ?>
197	<p class="description"><?php printf( \esc_html__( 'Try to follow "@%s" in the Mastodon/Friendica search field.', 'activitypub' ), \esc_html( \Activitypub\get_webfinger_resource( $user_id ) ) ); ?></p>
198	</td>
199	</tr>
200	</tbody>
201	</table>
202	<?php
203	}
204
205	function get_followers( $user_id ) {
206	$followers = \Activitypub\Peer\Followers::get_followers( $user_id );
207
208	if ( ! $followers ) {
209	return array();
210	}
211
212	return $followers;
213	}
214
215	function count_followers( $user_id ) {
216	$followers = \Activitypub\get_followers( $user_id );
217
218	return \count( $followers );
219	}
220
221	/**
222	* Examine a url and try to determine the author ID it represents.
223	*
224	* Checks are supposedly from the hosted site blog.
225	*
226	* @param string $url Permalink to check.
227	*
228	* @return int User ID, or 0 on failure.
229	*/
230	function url_to_authorid( $url ) {
231	global $wp_rewrite;
232
233	// check if url hase the same host
234	if ( wp_parse_url( site_url(), PHP_URL_HOST ) !== wp_parse_url( $url, PHP_URL_HOST ) ) {
235	return 0;
236	}
237
238	// first, check to see if there is a 'author=N' to match against
239	if ( preg_match( '/[?&]author=(\d+)/i', $url, $values ) ) {
240	$id = absint( $values[1] );
241	if ( $id ) {
242	return $id;
243	}
244	}
245
246	// check to see if we are using rewrite rules
247	$rewrite = $wp_rewrite->wp_rewrite_rules();
248
249	// not using rewrite rules, and 'author=N' method failed, so we're out of options
250	if ( empty( $rewrite ) ) {
251	return 0;
252	}
253
254	// generate rewrite rule for the author url
255	$author_rewrite = $wp_rewrite->get_author_permastruct();
256	$author_regexp = str_replace( '%author%', '', $author_rewrite );
257
258	// match the rewrite rule with the passed url
259	if ( preg_match( '/https?:\/\/(.+)' . preg_quote( $author_regexp, '/' ) . '([^\/]+)/i', $url, $match ) ) {
260	$user = get_user_by( 'slug', $match[2] );
261	if ( $user ) {
262	return $user->ID;
263	}
264	}
265
266	return 0;
267	}
268