wordpress-activitypub/includes/class-mention.php

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<?php
namespace Activitypub;
use WP_Error;
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/**
* ActivityPub Mention Class
*
* @author Alex Kirk
*/
class Mention {
/**
* Initialize the class, registering WordPress hooks
*/
public static function init() {
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\add_filter( 'the_content', array( self::class, 'the_content' ), 99, 2 );
\add_filter( 'activitypub_extract_mentions', array( self::class, 'extract_mentions' ), 99, 2 );
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}
/**
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* Filter to replace the mentions in the content with links
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*
* @param string $the_content the post-content
*
* @return string the filtered post-content
*/
public static function the_content( $the_content ) {
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$protected_tags = array();
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$protect = function( $m ) use ( &$protected_tags ) {
$c = count( $protected_tags );
$protect = '!#!#PROTECT' . $c . '#!#!';
$protected_tags[ $protect ] = $m[0];
return $protect;
};
$the_content = preg_replace_callback(
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'#<!\[CDATA\[.*?\]\]>#is',
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$protect,
$the_content
);
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$the_content = preg_replace_callback(
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'#<(pre|code|textarea|style)\b[^>]*>.*?</\1[^>]*>#is',
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$protect,
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$the_content
);
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$the_content = preg_replace_callback(
'#<a.*?href=[^>]+>.*?</a>#i',
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$protect,
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$the_content
);
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$the_content = \preg_replace_callback( '/@' . ACTIVITYPUB_USERNAME_REGEXP . '/', array( self::class, 'replace_with_links' ), $the_content );
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$the_content = str_replace( array_reverse( array_keys( $protected_tags ) ), array_reverse( array_values( $protected_tags ) ), $the_content );
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return $the_content;
}
/**
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* A callback for preg_replace to build the user links
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*
* @param array $result the preg_match results
*
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* @return string the final string
*/
public static function replace_with_links( $result ) {
$metadata = get_remote_metadata_by_actor( $result[0], true );
if ( ! is_wp_error( $metadata ) && ! empty( $metadata['url'] ) ) {
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$username = ltrim( $result[0], '@' );
if ( ! empty( $metadata['name'] ) ) {
$username = $metadata['name'];
}
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if ( ! empty( $metadata['preferredUsername'] ) ) {
$username = $metadata['preferredUsername'];
}
$username = '@<span>' . $username . '</span>';
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return \sprintf( '<a rel="mention" class="u-url mention" href="%s">%s</a>', $metadata['url'], $username );
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}
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return $result[0];
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}
/**
* Get the Inboxes for the mentioned Actors
*
* @param array $mentioned The list of Actors that were mentioned
*
* @return array The list of Inboxes
*/
public static function get_inboxes( $mentioned ) {
$inboxes = array();
foreach ( $mentioned as $actor ) {
$inbox = self::get_inbox_by_mentioned_actor( $actor );
if ( ! is_wp_error( $inbox ) && $inbox ) {
$inboxes[] = $inbox;
}
}
return $inboxes;
}
/**
* Get the inbox from the Remote-Profile of a mentioned Actor
*
* @param string $actor The Actor-URL
*
* @return string The Inbox-URL
*/
public static function get_inbox_by_mentioned_actor( $actor ) {
$metadata = get_remote_metadata_by_actor( $actor, true );
if ( \is_wp_error( $metadata ) ) {
return $metadata;
}
if ( isset( $metadata['endpoints'] ) && isset( $metadata['endpoints']['sharedInbox'] ) ) {
return $metadata['endpoints']['sharedInbox'];
}
if ( \array_key_exists( 'inbox', $metadata ) ) {
return $metadata['inbox'];
}
return new WP_Error( 'activitypub_no_inbox', \__( 'No "Inbox" found', 'activitypub' ), $metadata );
}
/**
* Extract the mentions from the post_content.
*
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* @param array $mentions The already found mentions.
* @param string $post_content The post content.
*
* @return mixed The discovered mentions.
*/
public static function extract_mentions( $mentions, $post_content ) {
\preg_match_all( '/@' . ACTIVITYPUB_USERNAME_REGEXP . '/i', $post_content, $matches );
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foreach ( $matches[0] as $match ) {
$link = Webfinger::resolve( $match );
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if ( ! is_wp_error( $link ) ) {
$mentions[ $match ] = $link;
}
}
return $mentions;
}
}