gutenberg / lib / compat / wordpress-7.1 / notes-mentions.php

notes-mentions.php in Gutenberg 24.1.0, at lib/compat/wordpress-7.1/notes-mentions.php

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1	<?php
2	/**
3	* Mention notifications for notes (block comments).
4	*
5	* Note content can carry `@` mentions, stored as chips of the form
6	* `<span class="wp-note-mention user-N">@Name</span>` where `N` is the
7	* mentioned user's ID (the markup contract lives in
8	* packages/editor/src/components/collab-sidebar/note-mention-completer.tsx,
9	* and the kses allowance for the classes in
10	* lib/compat/wordpress-7.1/block-comments.php). When a note is created through
11	* the REST API this file parses those mentions out of the saved content and
12	* emails the mentioned users.
13	*
14	* WordPress core already notifies the post author of every note via
15	* `wp_new_comment_via_rest_notify_postauthor()` on `rest_insert_comment`. This
16	* file adds the mentioned-user audience on the same hook and deliberately
17	* leaves the post author to core to avoid sending them a duplicate email.
18	*
19	* @package gutenberg
20	* @since 7.1.0
21	*/
22
23	/**
24	* Extracts the mentioned user IDs from note content.
25	*
26	* Mentions are stored as chips carrying the `wp-note-mention` class plus a
27	* `user-N` class token holding the mentioned user's ID. Only elements that
28	* carry both are treated as mentions.
29	*
30	* @since 7.1.0
31	*
32	* @param string $content Note (comment) content, as stored.
33	* @return list<int> Unique, positive mentioned user IDs.
34	* @phpstan-return list<positive-int>
35	*/
36	function gutenberg_get_note_mentioned_user_ids( string $content ): array {
37	if ( ! str_contains( $content, 'wp-note-mention' ) ) {
38	return array();
39	}
40
41	$user_ids = array();
42	$processor = new WP_HTML_Tag_Processor( $content );
43	while (
44	$processor->next_tag(
45	array(
46	'tag_name' => 'SPAN',
47	'class_name' => 'wp-note-mention',
48	)
49	)
50	) {
51	foreach ( $processor->class_list() as $class_name ) {
52	if ( 1 === preg_match( '/^user-([1-9][0-9]*)$/', $class_name, $matches ) ) {
53	$user_ids[] = (int) $matches[1];
54	break;
55	}
56	}
57	}
58
59	return array_values( array_unique( $user_ids, SORT_NUMERIC ) );
60	}
61
62	/**
63	* Notifies mentioned users about a new note.
64	*
65	* Runs on `rest_insert_comment` alongside core's post-author notification.
66	* The recipient set is the users mentioned in this note, minus the note's
67	* own author (you are not notified about your own note) and the post
68	* author (core already notifies them about every note).
69	*
70	* Only fires when a note is created, not when an existing one is edited,
71	* so correcting a note does not re-notify everyone who already received it.
72	*
73	* @since 7.1.0
74	*
75	* @param WP_Comment\|null $comment The note that was just inserted. Null only if it was deleted in the meantime.
76	* @param mixed $request The REST request. Unused.
77	* @param bool $creating Whether this is a create (true) or update (false).
78	*/
79	function gutenberg_notify_note_mentions( ?WP_Comment $comment, $request = null, bool $creating = true ): void {
80	if ( ! $creating \|\| ! $comment ) {
81	return;
82	}
83
84	if ( 'note' !== $comment->comment_type ) {
85	return;
86	}
87
88	// Share the single user-facing notes notification preference with core.
89	if ( ! get_option( 'wp_notes_notify', 1 ) ) {
90	return;
91	}
92
93	$mentioned = gutenberg_get_note_mentioned_user_ids( $comment->comment_content );
94
95	$author_id = (int) $comment->user_id;
96
97	// get_post() falls back to the global post when passed 0, which would compose the email about the wrong post.
98	$comment_post_id = (int) $comment->comment_post_ID;
99	$post = $comment_post_id ? get_post( $comment_post_id ) : null;
100	$post_author_id = $post ? (int) $post->post_author : 0;
101
102	/*
103	* The recipient set is bounded and small (one note's mentions), so
104	* emails are sent synchronously here. If notification volume ever
105	* warrants it, the right fix is to offload delivery to a background
106	* queue (wp_schedule_single_event() / Action Scheduler) rather than
107	* throttle within the request.
108	*/
109	foreach ( $mentioned as $user_id ) {
110	$user_id = (int) $user_id;
111
112	// Never notify the author about their own note.
113	if ( $user_id === $author_id ) {
114	continue;
115	}
116
117	// Core already notifies the post author of every note.
118	if ( $user_id === $post_author_id ) {
119	continue;
120	}
121
122	$user = get_userdata( $user_id );
123	if ( ! $user \|\| empty( $user->user_email ) ) {
124	continue;
125	}
126
127	/*
128	* Only notify users who can actually read the note. Notes are
129	* internal: core's WP_REST_Comments_Controller::check_read_permission()
130	* only exposes a note to its author or to users who can edit it, so
131	* the email audience is held to the same bar. A plain read_post
132	* check would leak note content to e.g. subscribers on a public
133	* post, who cannot see the note in the editor.
134	*/
135	if ( ! user_can( $user_id, 'edit_comment', $comment->comment_ID ) ) {
136	continue;
137	}
138
139	gutenberg_send_note_notification( $user, $comment, $post );
140	}
141	}
142	/*
143	* Once the Core backport lands, WordPress registers its own
144	* wp_notify_note_mentions() on this same hook from default-filters.php. With
145	* both callbacks attached every mentioned user would be emailed twice, so the
146	* plugin's copy - the newer of the two - replaces Core's while Gutenberg is
147	* active. Core's post-author notification is deliberately left alone: this
148	* file never notifies the post author, so the two do not overlap.
149	*/
150	$gutenberg_note_mentions_priority = has_action( 'rest_insert_comment', 'wp_notify_note_mentions' );
151	if ( false !== $gutenberg_note_mentions_priority ) {
152	remove_action( 'rest_insert_comment', 'wp_notify_note_mentions', $gutenberg_note_mentions_priority );
153	}
154	unset( $gutenberg_note_mentions_priority );
155
156	add_action( 'rest_insert_comment', 'gutenberg_notify_note_mentions', 10, 3 );
157
158	/**
159	* Sends a single note mention notification email.
160	*
161	* The email is composed in the recipient's locale, matching how core composes
162	* other user-directed notifications, and links to the post editor the same way
163	* core's own note notification does.
164	*
165	* @since 7.1.0
166	*
167	* @param WP_User $user The recipient.
168	* @param WP_Comment $comment The note that triggered the notification.
169	* @param WP_Post\|null $post The post the note belongs to.
170	* @return bool Whether the email was accepted for delivery by wp_mail().
171	*/
172	function gutenberg_send_note_notification( WP_User $user, WP_Comment $comment, ?WP_Post $post ): bool {
173	$switched_locale = switch_to_user_locale( $user->ID );
174
175	/*
176	* The site title and the post title are escaped on the way into the database,
177	* and note content is stored as HTML. Both are reversed once here for the
178	* plain text arena of emails. Decoding a second time would go too far and
179	* resolve entities the author meant to be read literally. Tags are stripped
180	* before decoding, so escaped text such as "<code>" survives as text
181	* rather than being read as a tag and dropped.
182	*/
183	$blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
184	$post_title = $post ? wp_specialchars_decode( get_the_title( $post ), ENT_QUOTES ) : '';
185	$author_name = $comment->comment_author ? $comment->comment_author : __( 'Someone', 'gutenberg' );
186	$content = wp_specialchars_decode( wp_strip_all_tags( $comment->comment_content ) );
187
188	/*
189	* The rest of the message is composed for the recipient, and so is the editor
190	* link: get_edit_post_link() answers for whoever is current, which here is the
191	* note's author over REST and nobody at all under WP-Cron.
192	*/
193	$edit_link = '';
194	if ( $post ) {
195	$previous_user_id = get_current_user_id();
196	wp_set_current_user( $user->ID );
197	$edit_link = (string) get_edit_post_link( $post->ID, 'url' );
198	wp_set_current_user( $previous_user_id );
199	}
200
201	/* translators: %1$s: commenter name, %2$s: post title. */
202	$message = sprintf( __( '%1$s mentioned you in a note on "%2$s".', 'gutenberg' ), $author_name, $post_title );
203	/* translators: %1$s: site name, %2$s: post title. */
204	$subject = sprintf( __( '[%1$s] You were mentioned in a note on "%2$s"', 'gutenberg' ), $blogname, $post_title );
205
206	$lines = array( $message, '' );
207	if ( '' !== $content ) {
208	$lines[] = $content;
209	}
210	if ( $edit_link ) {
211	$lines[] = '';
212	$lines[] = __( 'Edit This', 'gutenberg' ) . ': ' . $edit_link;
213	}
214
215	// Declared explicitly so a filtered default cannot turn the message into HTML.
216	$headers = 'Content-Type: text/plain; charset="' . get_option( 'blog_charset' ) . '"';
217
218	$sent = wp_mail( $user->user_email, $subject, implode( "\n", $lines ), $headers );
219
220	if ( $switched_locale ) {
221	restore_previous_locale();
222	}
223
224	return $sent;
225	}
226