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<?php
/**
* ActivityPub Search Enhancement Class
*
* @package Activitypub
*/
namespace Activitypub;
use Activitypub\Collection\Interactions;
/**
* ActivityPub Search Enhancement Class
*
* This class enhances WordPress search functionality to detect URLs in search queries
* and attempt to import ActivityPub objects if found, otherwise falls back to classic search.
*/
class Search {
/**
* Initialize the search enhancement.
*/
public static function init() {
\add_filter( 'pre_get_posts', array( self::class, 'enhance_public_search' ) );
\add_action( 'load-edit-comments.php', array( self::class, 'enhance_admin_comment_search' ) );
}
/**
* Enhance public search functionality to check for URLs and ActivityPub objects.
*
* @param \WP_Query $query The WP_Query instance.
* @return \WP_Query The modified query.
*/
public static function enhance_public_search( $query ) {
// Check user capabilities.
if ( ! \current_user_can( 'activitypub' ) ) {
return $query;
}
// Only enhance main search queries on frontend.
if ( ! $query->is_main_query() || ! $query->is_search() || \is_admin() ) {
return $query;
}
$search_term = $query->get( 's' );
if ( empty( $search_term ) ) {
return $query;
}
// Check if search term is a URL.
if ( ! \wp_http_validate_url( $search_term ) ) {
return $query;
}
// Try to import ActivityPub object.
$imported = self::try_import_activitypub_object( $search_term );
if ( $imported ) {
// Ensure the imported comment is approved/published.
\wp_set_comment_status( $imported, 'approve' );
$comment_link = \get_comment_link( $imported );
$validated_link = \wp_validate_redirect( $comment_link, \home_url() );
if ( $validated_link ) {
\wp_safe_redirect( $validated_link );
exit;
}
}
// Fall back to classic search if import failed or no redirect.
return $query;
}
/**
* Handle admin comment search to check for URLs and ActivityPub objects.
* Runs on admin_init to avoid infinite loops.
*/
public static function enhance_admin_comment_search() {
// Check user capabilities.
if ( ! \current_user_can( 'activitypub' ) ) {
return;
}
// phpcs:ignore WordPress.Security.NonceVerification.Recommended
$search_term = isset( $_GET['s'] ) ? \sanitize_text_field( \wp_unslash( $_GET['s'] ) ) : '';
if ( empty( $search_term ) ) {
return;
}
// Check if search term is a URL.
if ( ! \wp_http_validate_url( $search_term ) ) {
return;
}
// Try to import ActivityPub object.
$imported = self::try_import_activitypub_object( $search_term );
if ( $imported ) {
// Ensure the imported comment is approved/published.
\wp_set_comment_status( $imported, 'approve' );
$comment_link = \get_comment_link( $imported );
$validated_link = \wp_validate_redirect( $comment_link, \home_url() );
if ( $validated_link ) {
\wp_safe_redirect( $validated_link );
exit;
}
}
}
/**
* Try to import an ActivityPub reply from a URL.
*
* @param string $url The URL to check and import.
*
* @return int|false The imported comment ID or false on failure.
*/
private static function try_import_activitypub_object( $url ) {
// Check if it's already imported.
$existing = Comment::url_to_commentid( $url );
if ( $existing ) {
return $existing;
}
// Try to fetch as ActivityPub object.
$object = Http::get_remote_object( $url );
if ( \is_wp_error( $object ) ) {
return false;
}
// Check if it's a reply (has inReplyTo).
if ( empty( $object['inReplyTo'] ) ) {
return false;
}
$activity = array(
'type' => 'Create',
'actor' => $object['attributedTo'],
'object' => $object,
);
// Import the reply as a comment.
return Interactions::add_comment( $activity );
}
}