laipower/wp-content/plugins/activitypub/includes/class-mention.php

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<?php
namespace Activitypub;
use WP_Error;
use Activitypub\Webfinger;
/**
* ActivityPub Mention Class
*
* @author Alex Kirk
*/
class Mention {
/**
* Initialize the class, registering WordPress hooks
*/
public static function init() {
\add_filter( 'the_content', array( self::class, 'the_content' ), 99, 1 );
\add_filter( 'comment_text', array( self::class, 'the_content' ), 10, 1 );
\add_filter( 'activitypub_extract_mentions', array( self::class, 'extract_mentions' ), 99, 2 );
}
/**
* Filter to replace the mentions in the content with links
*
* @param string $the_content the post-content
*
* @return string the filtered post-content
*/
public static function the_content( $the_content ) {
// small protection against execution timeouts: limit to 1 MB
if ( mb_strlen( $the_content ) > MB_IN_BYTES ) {
return $the_content;
}
$tag_stack = array();
$protected_tags = array(
'pre',
'code',
'textarea',
'style',
'a',
);
$content_with_links = '';
$in_protected_tag = false;
foreach ( wp_html_split( $the_content ) as $chunk ) {
if ( preg_match( '#^<!--[\s\S]*-->$#i', $chunk, $m ) ) {
$content_with_links .= $chunk;
continue;
}
if ( preg_match( '#^<(/)?([a-z-]+)\b[^>]*>$#i', $chunk, $m ) ) {
$tag = strtolower( $m[2] );
if ( '/' === $m[1] ) {
// Closing tag.
$i = array_search( $tag, $tag_stack );
// We can only remove the tag from the stack if it is in the stack.
if ( false !== $i ) {
$tag_stack = array_slice( $tag_stack, 0, $i );
}
} else {
// Opening tag, add it to the stack.
$tag_stack[] = $tag;
}
// If we're in a protected tag, the tag_stack contains at least one protected tag string.
// The protected tag state can only change when we encounter a start or end tag.
$in_protected_tag = array_intersect( $tag_stack, $protected_tags );
// Never inspect tags.
$content_with_links .= $chunk;
continue;
}
if ( $in_protected_tag ) {
// Don't inspect a chunk inside an inspected tag.
$content_with_links .= $chunk;
continue;
}
// Only reachable when there is no protected tag in the stack.
$content_with_links .= \preg_replace_callback( '/@' . ACTIVITYPUB_USERNAME_REGEXP . '/', array( self::class, 'replace_with_links' ), $chunk );
}
return $content_with_links;
}
/**
* A callback for preg_replace to build the user links
*
* @param array $result the preg_match results
*
* @return string the final string
*/
public static function replace_with_links( $result ) {
$metadata = get_remote_metadata_by_actor( $result[0] );
if ( ! empty( $metadata ) && ! is_wp_error( $metadata ) && ! empty( $metadata['url'] ) ) {
$username = ltrim( $result[0], '@' );
if ( ! empty( $metadata['name'] ) ) {
$username = $metadata['name'];
}
if ( ! empty( $metadata['preferredUsername'] ) ) {
$username = $metadata['preferredUsername'];
}
$url = isset( $metadata['url'] ) ? $metadata['url'] : $metadata['id'];
if ( \is_array( $url ) ) {
$url = $url[0];
}
return \sprintf( '<a rel="mention" class="u-url mention" href="%s">@<span>%s</span></a>', esc_url( $url ), esc_html( $username ) );
}
return $result[0];
}
/**
* 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 );
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.
*
* @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 );
foreach ( $matches[0] as $match ) {
$link = Webfinger::resolve( $match );
if ( ! is_wp_error( $link ) ) {
$mentions[ $match ] = $link;
}
}
return $mentions;
}
}