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<?php |
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namespace Activitypub; |
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|
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use WP_Error; |
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use Activitypub\Webfinger; |
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|
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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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/** |
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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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// small protection against execution timeouts: limit to 1 MB |
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if ( mb_strlen( $the_content ) > MB_IN_BYTES ) { |
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return $the_content; |
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} |
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$tag_stack = array(); |
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$protected_tags = array( |
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'pre', |
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'code', |
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'textarea', |
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'style', |
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'a', |
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); |
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$content_with_links = ''; |
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$in_protected_tag = false; |
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foreach ( wp_html_split( $the_content ) as $chunk ) { |
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if ( preg_match( '#^<!--[\s\S]*-->$#i', $chunk, $m ) ) { |
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$content_with_links .= $chunk; |
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continue; |
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} |
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|
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if ( preg_match( '#^<(/)?([a-z-]+)\b[^>]*>$#i', $chunk, $m ) ) { |
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$tag = strtolower( $m[2] ); |
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if ( '/' === $m[1] ) { |
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// Closing tag. |
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$i = array_search( $tag, $tag_stack ); |
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// We can only remove the tag from the stack if it is in the stack. |
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if ( false !== $i ) { |
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$tag_stack = array_slice( $tag_stack, 0, $i ); |
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} |
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} else { |
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// Opening tag, add it to the stack. |
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$tag_stack[] = $tag; |
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} |
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|
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// If we're in a protected tag, the tag_stack contains at least one protected tag string. |
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// The protected tag state can only change when we encounter a start or end tag. |
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$in_protected_tag = array_intersect( $tag_stack, $protected_tags ); |
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|
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// Never inspect tags. |
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$content_with_links .= $chunk; |
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continue; |
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} |
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|
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if ( $in_protected_tag ) { |
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// Don't inspect a chunk inside an inspected tag. |
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$content_with_links .= $chunk; |
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continue; |
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} |
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|
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// Only reachable when there is no protected tag in the stack. |
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$content_with_links .= \preg_replace_callback( '/@' . ACTIVITYPUB_USERNAME_REGEXP . '/', array( self::class, 'replace_with_links' ), $chunk ); |
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} |
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|
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return $content_with_links; |
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} |
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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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|
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if ( ! empty( $metadata ) && ! 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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|
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return $result[0]; |
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} |
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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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|
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foreach ( $mentioned as $actor ) { |
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$inbox = self::get_inbox_by_mentioned_actor( $actor ); |
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|
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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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|
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return $inboxes; |
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} |
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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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|
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if ( \is_wp_error( $metadata ) ) { |
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return $metadata; |
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} |
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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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|
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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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|
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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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/** |
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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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|
