| 1 |
<?php |
| 2 |
namespace Activitypub; |
| 3 |
|
| 4 |
use WP_Error; |
| 5 |
|
| 6 |
/** |
| 7 |
* ActivityPub Mention Class |
| 8 |
* |
| 9 |
* @author Alex Kirk |
| 10 |
*/ |
| 11 |
class Mention { |
| 12 |
/** |
| 13 |
* Initialize the class, registering WordPress hooks |
| 14 |
*/ |
| 15 |
public static function init() { |
| 16 |
\add_filter( 'the_content', array( self::class, 'the_content' ), 99, 2 ); |
| 17 |
\add_filter( 'activitypub_extract_mentions', array( self::class, 'extract_mentions' ), 99, 2 ); |
| 18 |
} |
| 19 |
|
| 20 |
/** |
| 21 |
* Filter to replace the mentions in the content with links |
| 22 |
* |
| 23 |
* @param string $the_content the post-content |
| 24 |
* |
| 25 |
* @return string the filtered post-content |
| 26 |
*/ |
| 27 |
public static function the_content( $the_content ) { |
| 28 |
$tag_stack = array(); |
| 29 |
$protected_tags = array( |
| 30 |
'pre', |
| 31 |
'code', |
| 32 |
'textarea', |
| 33 |
'style', |
| 34 |
'a', |
| 35 |
); |
| 36 |
$content_with_links = ''; |
| 37 |
$in_protected_tag = false; |
| 38 |
foreach ( wp_html_split( $the_content ) as $chunk ) { |
| 39 |
if ( preg_match( '#^<!--[\s\S]*-->$#i', $chunk, $m ) ) { |
| 40 |
$content_with_links .= $chunk; |
| 41 |
continue; |
| 42 |
} |
| 43 |
|
| 44 |
if ( preg_match( '#^<(/)?([a-z-]+)\b[^>]*>$#i', $chunk, $m ) ) { |
| 45 |
$tag = strtolower( $m[2] ); |
| 46 |
if ( '/' === $m[1] ) { |
| 47 |
// Closing tag. |
| 48 |
$i = array_search( $tag, $tag_stack ); |
| 49 |
// We can only remove the tag from the stack if it is in the stack. |
| 50 |
if ( false !== $i ) { |
| 51 |
$tag_stack = array_slice( $tag_stack, 0, $i ); |
| 52 |
} |
| 53 |
} else { |
| 54 |
// Opening tag, add it to the stack. |
| 55 |
$tag_stack[] = $tag; |
| 56 |
} |
| 57 |
|
| 58 |
// If we're in a protected tag, the tag_stack contains at least one protected tag string. |
| 59 |
// The protected tag state can only change when we encounter a start or end tag. |
| 60 |
$in_protected_tag = array_intersect( $tag_stack, $protected_tags ); |
| 61 |
|
| 62 |
// Never inspect tags. |
| 63 |
$content_with_links .= $chunk; |
| 64 |
continue; |
| 65 |
} |
| 66 |
|
| 67 |
if ( $in_protected_tag ) { |
| 68 |
// Don't inspect a chunk inside an inspected tag. |
| 69 |
$content_with_links .= $chunk; |
| 70 |
continue; |
| 71 |
} |
| 72 |
|
| 73 |
// Only reachable when there is no protected tag in the stack. |
| 74 |
$content_with_links .= \preg_replace_callback( '/@' . ACTIVITYPUB_USERNAME_REGEXP . '/', array( self::class, 'replace_with_links' ), $chunk ); |
| 75 |
} |
| 76 |
|
| 77 |
return $content_with_links; |
| 78 |
} |
| 79 |
|
| 80 |
/** |
| 81 |
* A callback for preg_replace to build the user links |
| 82 |
* |
| 83 |
* @param array $result the preg_match results |
| 84 |
* |
| 85 |
* @return string the final string |
| 86 |
*/ |
| 87 |
public static function replace_with_links( $result ) { |
| 88 |
$metadata = get_remote_metadata_by_actor( $result[0] ); |
| 89 |
|
| 90 |
if ( ! empty( $metadata ) && ! is_wp_error( $metadata ) && ! empty( $metadata['url'] ) ) { |
| 91 |
$username = ltrim( $result[0], '@' ); |
| 92 |
if ( ! empty( $metadata['name'] ) ) { |
| 93 |
$username = $metadata['name']; |
| 94 |
} |
| 95 |
if ( ! empty( $metadata['preferredUsername'] ) ) { |
| 96 |
$username = $metadata['preferredUsername']; |
| 97 |
} |
| 98 |
return \sprintf( '<a rel="mention" class="u-url mention" href="%s">@<span>%s</span></a>', esc_url( $metadata['url'] ), esc_html( $username ) ); |
| 99 |
} |
| 100 |
|
| 101 |
return $result[0]; |
| 102 |
} |
| 103 |
|
| 104 |
/** |
| 105 |
* Get the Inboxes for the mentioned Actors |
| 106 |
* |
| 107 |
* @param array $mentioned The list of Actors that were mentioned |
| 108 |
* |
| 109 |
* @return array The list of Inboxes |
| 110 |
*/ |
| 111 |
public static function get_inboxes( $mentioned ) { |
| 112 |
$inboxes = array(); |
| 113 |
|
| 114 |
foreach ( $mentioned as $actor ) { |
| 115 |
$inbox = self::get_inbox_by_mentioned_actor( $actor ); |
| 116 |
|
| 117 |
if ( ! is_wp_error( $inbox ) && $inbox ) { |
| 118 |
$inboxes[] = $inbox; |
| 119 |
} |
| 120 |
} |
| 121 |
|
| 122 |
return $inboxes; |
| 123 |
} |
| 124 |
|
| 125 |
/** |
| 126 |
* Get the inbox from the Remote-Profile of a mentioned Actor |
| 127 |
* |
| 128 |
* @param string $actor The Actor-URL |
| 129 |
* |
| 130 |
* @return string The Inbox-URL |
| 131 |
*/ |
| 132 |
public static function get_inbox_by_mentioned_actor( $actor ) { |
| 133 |
$metadata = get_remote_metadata_by_actor( $actor ); |
| 134 |
|
| 135 |
if ( \is_wp_error( $metadata ) ) { |
| 136 |
return $metadata; |
| 137 |
} |
| 138 |
|
| 139 |
if ( isset( $metadata['endpoints'] ) && isset( $metadata['endpoints']['sharedInbox'] ) ) { |
| 140 |
return $metadata['endpoints']['sharedInbox']; |
| 141 |
} |
| 142 |
|
| 143 |
if ( \array_key_exists( 'inbox', $metadata ) ) { |
| 144 |
return $metadata['inbox']; |
| 145 |
} |
| 146 |
|
| 147 |
return new WP_Error( 'activitypub_no_inbox', \__( 'No "Inbox" found', 'activitypub' ), $metadata ); |
| 148 |
} |
| 149 |
|
| 150 |
/** |
| 151 |
* Extract the mentions from the post_content. |
| 152 |
* |
| 153 |
* @param array $mentions The already found mentions. |
| 154 |
* @param string $post_content The post content. |
| 155 |
* |
| 156 |
* @return mixed The discovered mentions. |
| 157 |
*/ |
| 158 |
public static function extract_mentions( $mentions, $post_content ) { |
| 159 |
\preg_match_all( '/@' . ACTIVITYPUB_USERNAME_REGEXP . '/i', $post_content, $matches ); |
| 160 |
foreach ( $matches[0] as $match ) { |
| 161 |
$link = Webfinger::resolve( $match ); |
| 162 |
if ( ! is_wp_error( $link ) ) { |
| 163 |
$mentions[ $match ] = $link; |
| 164 |
} |
| 165 |
} |
| 166 |
return $mentions; |
| 167 |
} |
| 168 |
} |
| 169 |
|
