155 lines
4.1 KiB
PHP
155 lines
4.1 KiB
PHP
<?php
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namespace Activitypub;
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use WP_Error;
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/**
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* ActivityPub Mention Class
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*
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* @author Alex Kirk
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*/
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class Mention {
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/**
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* Initialize the class, registering WordPress hooks
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*/
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public static function init() {
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\add_filter( 'the_content', array( self::class, 'the_content' ), 99, 2 );
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\add_filter( 'activitypub_extract_mentions', array( self::class, 'extract_mentions' ), 99, 2 );
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}
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/**
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* Filter to replace the mentions in the content with links
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*
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* @param string $the_content the post-content
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*
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* @return string the filtered post-content
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*/
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public static function the_content( $the_content ) {
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$protected_tags = array();
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$protect = function( $m ) use ( &$protected_tags ) {
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$c = \wp_rand( 100000, 999999 );
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$protect = '!#!#PROTECT' . $c . '#!#!';
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while ( isset( $protected_tags[ $protect ] ) ) {
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$c = \wp_rand( 100000, 999999 );
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$protect = '!#!#PROTECT' . $c . '#!#!';
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}
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$protected_tags[ $protect ] = $m[0];
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return $protect;
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};
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$the_content = preg_replace_callback(
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'#<!\[CDATA\[.*?\]\]>#is',
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$protect,
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$the_content
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);
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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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$the_content
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);
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$the_content = preg_replace_callback(
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'#<a.*?href=[^>]+>.*?</a>#i',
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$protect,
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$the_content
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);
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$the_content = preg_replace_callback(
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'#<img.*?[^>]+>#i',
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$protect,
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$the_content
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);
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$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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}
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/**
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* A callback for preg_replace to build the user links
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*
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* @param array $result the preg_match results
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*
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* @return string the final string
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*/
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public static function replace_with_links( $result ) {
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$metadata = get_remote_metadata_by_actor( $result[0] );
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if ( ! is_wp_error( $metadata ) && ! empty( $metadata['url'] ) ) {
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$username = ltrim( $result[0], '@' );
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if ( ! empty( $metadata['name'] ) ) {
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$username = $metadata['name'];
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}
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if ( ! empty( $metadata['preferredUsername'] ) ) {
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$username = $metadata['preferredUsername'];
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}
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return \sprintf( '<a rel="mention" class="u-url mention" href="%s">@<span>%s</span></a>', esc_url( $metadata['url'] ), esc_html( $username ) );
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}
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return $result[0];
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}
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/**
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* Get the Inboxes for the mentioned Actors
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*
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* @param array $mentioned The list of Actors that were mentioned
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*
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* @return array The list of Inboxes
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*/
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public static function get_inboxes( $mentioned ) {
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$inboxes = array();
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foreach ( $mentioned as $actor ) {
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$inbox = self::get_inbox_by_mentioned_actor( $actor );
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if ( ! is_wp_error( $inbox ) && $inbox ) {
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$inboxes[] = $inbox;
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}
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}
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return $inboxes;
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}
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/**
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* Get the inbox from the Remote-Profile of a mentioned Actor
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*
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* @param string $actor The Actor-URL
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*
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* @return string The Inbox-URL
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*/
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public static function get_inbox_by_mentioned_actor( $actor ) {
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$metadata = get_remote_metadata_by_actor( $actor );
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if ( \is_wp_error( $metadata ) ) {
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return $metadata;
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}
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if ( isset( $metadata['endpoints'] ) && isset( $metadata['endpoints']['sharedInbox'] ) ) {
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return $metadata['endpoints']['sharedInbox'];
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}
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if ( \array_key_exists( 'inbox', $metadata ) ) {
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return $metadata['inbox'];
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}
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return new WP_Error( 'activitypub_no_inbox', \__( 'No "Inbox" found', 'activitypub' ), $metadata );
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}
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/**
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* Extract the mentions from the post_content.
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*
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* @param array $mentions The already found mentions.
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* @param string $post_content The post content.
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*
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* @return mixed The discovered mentions.
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*/
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public static function extract_mentions( $mentions, $post_content ) {
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\preg_match_all( '/@' . ACTIVITYPUB_USERNAME_REGEXP . '/i', $post_content, $matches );
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foreach ( $matches[0] as $match ) {
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$link = Webfinger::resolve( $match );
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if ( ! is_wp_error( $link ) ) {
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$mentions[ $match ] = $link;
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}
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}
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return $mentions;
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}
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}
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