BP_REST_Messages_Endpoint::search_thread_items( WP_REST_Request $request )

	public function search_thread_items( $request ) {
		$user_id      = $request->get_param( 'user_id' );
		$recipient_id = (array) $request->get_param( 'recipient_id' );

		if ( empty( $user_id ) ) {
			$user_id = bp_loggedin_user_id();
		}

		$retval = array();

		if ( class_exists( 'BP_Messages_Message' ) && method_exists( 'BP_Messages_Message', 'get_existing_thread' ) ) {
			$thread_id = BP_Messages_Message::get_existing_thread( $recipient_id, $user_id );

			if ( ! empty( $thread_id ) ) {
				$thread = $this->get_thread_object( $thread_id );

				$retval = $this->prepare_response_for_collection(
					$this->prepare_item_for_response( $thread, $request )
				);
			}
		}

		$response = rest_ensure_response( $retval );

		/**
		 * Fires after a thread id is fetched via the REST API.
		 *
		 * @since 0.1.0
		 *
		 * @param WP_REST_Request  $request  The request sent to the API.
		 *
		 * @param WP_REST_Response $response The response data.
		 */
		do_action( 'bp_rest_messages_search_thread_items', $response, $request );

		return $response;
	}