activitypub / includes / class-hashtag.php

class-hashtag.php in ActivityPub 7.7.0, at includes/class-hashtag.php

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1	<?php
2	/**
3	* Hashtag Class.
4	*
5	* @package Activitypub
6	*/
7
8	namespace Activitypub;
9
10	/**
11	* ActivityPub Hashtag Class.
12	*
13	* @author Matthias Pfefferle
14	*/
15	class Hashtag {
16	/**
17	* Initialize the class, registering WordPress hooks.
18	*/
19	public static function init() {
20	if ( '1' === \get_option( 'activitypub_use_hashtags', '1' ) ) {
21	\add_action( 'wp_insert_post', array( self::class, 'insert_post' ), 10, 2 );
22	\add_filter( 'the_content', array( self::class, 'the_content' ) );
23	\add_filter( 'activitypub_activity_object_array', array( self::class, 'filter_activity_object' ), 99 );
24	}
25	}
26
27	/**
28	* Filter only the activity object and replace summery it with URLs.
29	*
30	* @param array $activity The activity object array.
31	*
32	* @return array The filtered activity object array.
33	*/
34	public static function filter_activity_object( $activity ) {
35	if ( ! empty( $activity['summary'] ) && is_actor( $activity ) ) {
36	$activity['summary'] = self::the_content( $activity['summary'] );
37	}
38
39	if ( ! empty( $activity['content'] ) ) {
40	$activity['content'] = self::the_content( $activity['content'] );
41	}
42
43	return $activity;
44	}
45
46	/**
47	* Filter to save #tags as real WordPress tags.
48	*
49	* @param int $post_id Post ID.
50	* @param \WP_Post $post Post object.
51	*/
52	public static function insert_post( $post_id, $post ) {
53	// Check if the post supports ActivityPub.
54	if ( ! \post_type_supports( \get_post_type( $post ), 'activitypub' ) ) {
55	return;
56	}
57
58	// Check if the (custom) post supports tags.
59	$taxonomies = \get_object_taxonomies( $post );
60	if ( ! in_array( 'post_tag', $taxonomies, true ) ) {
61	return;
62	}
63
64	$tags = array();
65
66	// Skip hashtags in HTML attributes, like hex colors.
67	$content = wp_strip_all_tags( $post->post_content . "\n" . $post->post_excerpt );
68
69	if ( \preg_match_all( '/' . ACTIVITYPUB_HASHTAGS_REGEXP . '/i', $content, $match ) ) {
70	$tags = array_unique( $match[1] );
71	}
72
73	\wp_add_post_tags( $post->ID, \implode( ', ', $tags ) );
74	}
75
76	/**
77	* Filter to replace the #tags in the content with links.
78	*
79	* @param string $the_content The post content.
80	*
81	* @return string The filtered post content.
82	*/
83	public static function the_content( $the_content ) {
84	return enrich_content_data( $the_content, '/' . ACTIVITYPUB_HASHTAGS_REGEXP . '/i', array( self::class, 'replace_with_links' ) );
85	}
86
87	/**
88	* A callback for preg_replace to build the term links.
89	*
90	* @param array $result The preg_match results.
91	* @return string the final string
92	*/
93	public static function replace_with_links( $result ) {
94	$tag = $result[1];
95	$tag_object = \get_term_by( 'name', $tag, 'post_tag' );
96	if ( ! $tag_object ) {
97	$tag_object = \get_term_by( 'name', $tag, 'category' );
98	}
99
100	if ( $tag_object ) {
101	$link = \get_term_link( $tag_object, 'post_tag' );
102	return \sprintf( '<a rel="tag" class="hashtag u-tag u-category" href="%s">#%s</a>', esc_url( $link ), $tag );
103	}
104
105	return '#' . $tag;
106	}
107	}
108