669 lines
20 KiB
PHP
669 lines
20 KiB
PHP
<?php
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/**
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* REST API: WP_REST_URL_Details_Controller class
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*
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* @package WordPress
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* @subpackage REST_API
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* @since 5.9.0
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*/
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/**
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* Controller which provides REST endpoint for retrieving information
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* from a remote site's HTML response.
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*
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* @since 5.9.0
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*
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* @see WP_REST_Controller
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*/
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class WP_REST_URL_Details_Controller extends WP_REST_Controller {
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/**
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* Constructs the controller.
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*
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* @since 5.9.0
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*/
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public function __construct() {
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$this->namespace = 'wp-block-editor/v1';
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$this->rest_base = 'url-details';
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}
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/**
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* Registers the necessary REST API routes.
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*
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* @since 5.9.0
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*/
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public function register_routes() {
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register_rest_route(
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$this->namespace,
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'/' . $this->rest_base,
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array(
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array(
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'methods' => WP_REST_Server::READABLE,
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'callback' => array( $this, 'parse_url_details' ),
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'args' => array(
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'url' => array(
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'required' => true,
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'description' => __( 'The URL to process.' ),
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'validate_callback' => 'wp_http_validate_url',
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'sanitize_callback' => 'esc_url_raw',
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'type' => 'string',
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'format' => 'uri',
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),
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),
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'permission_callback' => array( $this, 'permissions_check' ),
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'schema' => array( $this, 'get_public_item_schema' ),
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),
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)
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);
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}
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/**
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* Retrieves the item's schema, conforming to JSON Schema.
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*
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* @since 5.9.0
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*
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* @return array Item schema data.
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*/
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public function get_item_schema() {
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if ( $this->schema ) {
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return $this->add_additional_fields_schema( $this->schema );
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}
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$this->schema = array(
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'$schema' => 'http://json-schema.org/draft-04/schema#',
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'title' => 'url-details',
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'type' => 'object',
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'properties' => array(
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'title' => array(
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'description' => sprintf(
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/* translators: %s: HTML title tag. */
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__( 'The contents of the %s element from the URL.' ),
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'<title>'
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),
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'type' => 'string',
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'context' => array( 'view', 'edit', 'embed' ),
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'readonly' => true,
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),
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'icon' => array(
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'description' => sprintf(
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/* translators: %s: HTML link tag. */
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__( 'The favicon image link of the %s element from the URL.' ),
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'<link rel="icon">'
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),
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'type' => 'string',
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'format' => 'uri',
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'context' => array( 'view', 'edit', 'embed' ),
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'readonly' => true,
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),
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'description' => array(
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'description' => sprintf(
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/* translators: %s: HTML meta tag. */
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__( 'The content of the %s element from the URL.' ),
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'<meta name="description">'
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),
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'type' => 'string',
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'context' => array( 'view', 'edit', 'embed' ),
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'readonly' => true,
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),
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'image' => array(
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'description' => sprintf(
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/* translators: 1: HTML meta tag, 2: HTML meta tag. */
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__( 'The Open Graph image link of the %1$s or %2$s element from the URL.' ),
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'<meta property="og:image">',
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'<meta property="og:image:url">'
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),
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'type' => 'string',
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'format' => 'uri',
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'context' => array( 'view', 'edit', 'embed' ),
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'readonly' => true,
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),
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),
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);
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return $this->add_additional_fields_schema( $this->schema );
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}
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/**
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* Retrieves the contents of the `<title>` tag from the HTML response.
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*
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* @since 5.9.0
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*
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* @param WP_REST_REQUEST $request Full details about the request.
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* @return WP_REST_Response|WP_Error The parsed details as a response object. WP_Error if there are errors.
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*/
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public function parse_url_details( $request ) {
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$url = untrailingslashit( $request['url'] );
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if ( empty( $url ) ) {
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return new WP_Error( 'rest_invalid_url', __( 'Invalid URL' ), array( 'status' => 404 ) );
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}
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// Transient per URL.
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$cache_key = $this->build_cache_key_for_url( $url );
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// Attempt to retrieve cached response.
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$cached_response = $this->get_cache( $cache_key );
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if ( ! empty( $cached_response ) ) {
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$remote_url_response = $cached_response;
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} else {
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$remote_url_response = $this->get_remote_url( $url );
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// Exit if we don't have a valid body or it's empty.
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if ( is_wp_error( $remote_url_response ) || empty( $remote_url_response ) ) {
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return $remote_url_response;
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}
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// Cache the valid response.
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$this->set_cache( $cache_key, $remote_url_response );
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}
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$html_head = $this->get_document_head( $remote_url_response );
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$meta_elements = $this->get_meta_with_content_elements( $html_head );
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$data = $this->add_additional_fields_to_object(
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array(
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'title' => $this->get_title( $html_head ),
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'icon' => $this->get_icon( $html_head, $url ),
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'description' => $this->get_description( $meta_elements ),
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'image' => $this->get_image( $meta_elements, $url ),
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),
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$request
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);
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// Wrap the data in a response object.
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$response = rest_ensure_response( $data );
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/**
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* Filters the URL data for the response.
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*
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* @since 5.9.0
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*
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* @param WP_REST_Response $response The response object.
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* @param string $url The requested URL.
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* @param WP_REST_Request $request Request object.
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* @param string $remote_url_response HTTP response body from the remote URL.
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*/
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return apply_filters( 'rest_prepare_url_details', $response, $url, $request, $remote_url_response );
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}
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/**
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* Checks whether a given request has permission to read remote urls.
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*
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* @since 5.9.0
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*
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* @return WP_Error|bool True if the request has permission, else WP_Error.
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*/
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public function permissions_check() {
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if ( current_user_can( 'edit_posts' ) ) {
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return true;
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}
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foreach ( get_post_types( array( 'show_in_rest' => true ), 'objects' ) as $post_type ) {
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if ( current_user_can( $post_type->cap->edit_posts ) ) {
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return true;
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}
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}
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return new WP_Error(
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'rest_cannot_view_url_details',
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__( 'Sorry, you are not allowed to process remote urls.' ),
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array( 'status' => rest_authorization_required_code() )
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);
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}
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/**
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* Retrieves the document title from a remote URL.
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*
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* @since 5.9.0
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*
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* @param string $url The website URL whose HTML to access.
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* @return string|WP_Error The HTTP response from the remote URL on success.
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* WP_Error if no response or no content.
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*/
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private function get_remote_url( $url ) {
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/*
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* Provide a modified UA string to workaround web properties which block WordPress "Pingbacks".
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* Why? The UA string used for pingback requests contains `WordPress/` which is very similar
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* to that used as the default UA string by the WP HTTP API. Therefore requests from this
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* REST endpoint are being unintentionally blocked as they are misidentified as pingback requests.
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* By slightly modifying the UA string, but still retaining the "WordPress" identification (via "WP")
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* we are able to work around this issue.
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* Example UA string: `WP-URLDetails/5.9-alpha-51389 (+http://localhost:8888)`.
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*/
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$modified_user_agent = 'WP-URLDetails/' . get_bloginfo( 'version' ) . ' (+' . get_bloginfo( 'url' ) . ')';
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$args = array(
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'limit_response_size' => 150 * KB_IN_BYTES,
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'user-agent' => $modified_user_agent,
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);
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/**
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* Filters the HTTP request args for URL data retrieval.
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*
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* Can be used to adjust response size limit and other WP_Http::request args.
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*
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* @since 5.9.0
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*
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* @param array $args Arguments used for the HTTP request.
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* @param string $url The attempted URL.
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*/
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$args = apply_filters( 'rest_url_details_http_request_args', $args, $url );
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$response = wp_safe_remote_get( $url, $args );
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if ( WP_Http::OK !== wp_remote_retrieve_response_code( $response ) ) {
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// Not saving the error response to cache since the error might be temporary.
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return new WP_Error(
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'no_response',
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__( 'URL not found. Response returned a non-200 status code for this URL.' ),
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array( 'status' => WP_Http::NOT_FOUND )
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);
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}
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$remote_body = wp_remote_retrieve_body( $response );
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if ( empty( $remote_body ) ) {
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return new WP_Error(
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'no_content',
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__( 'Unable to retrieve body from response at this URL.' ),
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array( 'status' => WP_Http::NOT_FOUND )
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);
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}
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return $remote_body;
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}
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/**
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* Parses the `<title>` contents from the provided HTML.
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*
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* @since 5.9.0
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*
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* @param string $html The HTML from the remote website at URL.
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* @return string The title tag contents on success. Empty string if not found.
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*/
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private function get_title( $html ) {
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$pattern = '#<title[^>]*>(.*?)<\s*/\s*title>#is';
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preg_match( $pattern, $html, $match_title );
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if ( empty( $match_title[1] ) || ! is_string( $match_title[1] ) ) {
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return '';
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}
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$title = trim( $match_title[1] );
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return $this->prepare_metadata_for_output( $title );
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}
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/**
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* Parses the site icon from the provided HTML.
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*
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* @since 5.9.0
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*
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* @param string $html The HTML from the remote website at URL.
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* @param string $url The target website URL.
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* @return string The icon URI on success. Empty string if not found.
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*/
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private function get_icon( $html, $url ) {
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// Grab the icon's link element.
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$pattern = '#<link\s[^>]*rel=(?:[\"\']??)\s*(?:icon|shortcut icon|icon shortcut)\s*(?:[\"\']??)[^>]*\/?>#isU';
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preg_match( $pattern, $html, $element );
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if ( empty( $element[0] ) || ! is_string( $element[0] ) ) {
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return '';
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}
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$element = trim( $element[0] );
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// Get the icon's href value.
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$pattern = '#href=([\"\']??)([^\" >]*?)\\1[^>]*#isU';
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preg_match( $pattern, $element, $icon );
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if ( empty( $icon[2] ) || ! is_string( $icon[2] ) ) {
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return '';
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}
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$icon = trim( $icon[2] );
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// If the icon is a data URL, return it.
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$parsed_icon = parse_url( $icon );
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if ( isset( $parsed_icon['scheme'] ) && 'data' === $parsed_icon['scheme'] ) {
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return $icon;
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}
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// Attempt to convert relative URLs to absolute.
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if ( ! is_string( $url ) || '' === $url ) {
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return $icon;
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}
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$parsed_url = parse_url( $url );
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if ( isset( $parsed_url['scheme'] ) && isset( $parsed_url['host'] ) ) {
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$root_url = $parsed_url['scheme'] . '://' . $parsed_url['host'] . '/';
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$icon = WP_Http::make_absolute_url( $icon, $root_url );
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}
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return $icon;
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}
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/**
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* Parses the meta description from the provided HTML.
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*
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* @since 5.9.0
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*
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* @param array $meta_elements {
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* A multi-dimensional indexed array on success, else empty array.
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*
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* @type string[] 0 Meta elements with a content attribute.
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* @type string[] 1 Content attribute's opening quotation mark.
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* @type string[] 2 Content attribute's value for each meta element.
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* }
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* @return string The meta description contents on success. Empty string if not found.
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*/
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private function get_description( $meta_elements ) {
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// Bail out if there are no meta elements.
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if ( empty( $meta_elements[0] ) ) {
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return '';
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}
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$description = $this->get_metadata_from_meta_element(
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$meta_elements,
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'name',
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'(?:description|og:description)'
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);
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// Bail out if description not found.
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if ( '' === $description ) {
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return '';
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}
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return $this->prepare_metadata_for_output( $description );
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}
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/**
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* Parses the Open Graph (OG) Image from the provided HTML.
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*
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* See: https://ogp.me/.
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*
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* @since 5.9.0
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*
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* @param array $meta_elements {
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* A multi-dimensional indexed array on success, else empty array.
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*
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* @type string[] 0 Meta elements with a content attribute.
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* @type string[] 1 Content attribute's opening quotation mark.
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* @type string[] 2 Content attribute's value for each meta element.
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* }
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* @param string $url The target website URL.
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* @return string The OG image on success. Empty string if not found.
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*/
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private function get_image( $meta_elements, $url ) {
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$image = $this->get_metadata_from_meta_element(
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$meta_elements,
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'property',
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'(?:og:image|og:image:url)'
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);
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// Bail out if image not found.
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if ( '' === $image ) {
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return '';
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}
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// Attempt to convert relative URLs to absolute.
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$parsed_url = parse_url( $url );
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if ( isset( $parsed_url['scheme'] ) && isset( $parsed_url['host'] ) ) {
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$root_url = $parsed_url['scheme'] . '://' . $parsed_url['host'] . '/';
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$image = WP_Http::make_absolute_url( $image, $root_url );
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}
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return $image;
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}
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/**
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* Prepares the metadata by:
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* - stripping all HTML tags and tag entities.
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* - converting non-tag entities into characters.
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*
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* @since 5.9.0
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*
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* @param string $metadata The metadata content to prepare.
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* @return string The prepared metadata.
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*/
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private function prepare_metadata_for_output( $metadata ) {
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$metadata = html_entity_decode( $metadata, ENT_QUOTES, get_bloginfo( 'charset' ) );
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$metadata = wp_strip_all_tags( $metadata );
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return $metadata;
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}
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|
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/**
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* Utility function to build cache key for a given URL.
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*
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* @since 5.9.0
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*
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* @param string $url The URL for which to build a cache key.
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* @return string The cache key.
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*/
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private function build_cache_key_for_url( $url ) {
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return 'g_url_details_response_' . md5( $url );
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}
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|
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/**
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* Utility function to retrieve a value from the cache at a given key.
|
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*
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* @since 5.9.0
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*
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* @param string $key The cache key.
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* @return mixed The value from the cache.
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*/
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private function get_cache( $key ) {
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return get_site_transient( $key );
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}
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|
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/**
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* Utility function to cache a given data set at a given cache key.
|
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*
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* @since 5.9.0
|
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*
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* @param string $key The cache key under which to store the value.
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* @param string $data The data to be stored at the given cache key.
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* @return bool True when transient set. False if not set.
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*/
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private function set_cache( $key, $data = '' ) {
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$ttl = HOUR_IN_SECONDS;
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|
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/**
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* Filters the cache expiration.
|
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*
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* Can be used to adjust the time until expiration in seconds for the cache
|
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* of the data retrieved for the given URL.
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*
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* @since 5.9.0
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*
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* @param int $ttl The time until cache expiration in seconds.
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*/
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$cache_expiration = apply_filters( 'rest_url_details_cache_expiration', $ttl );
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return set_site_transient( $key, $data, $cache_expiration );
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}
|
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|
|
/**
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* Retrieves the `<head>` section.
|
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*
|
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* @since 5.9.0
|
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*
|
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* @param string $html The string of HTML to parse.
|
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* @return string The `<head>..</head>` section on success. Given `$html` if not found.
|
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*/
|
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private function get_document_head( $html ) {
|
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$head_html = $html;
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|
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// Find the opening `<head>` tag.
|
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$head_start = strpos( $html, '<head' );
|
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if ( false === $head_start ) {
|
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// Didn't find it. Return the original HTML.
|
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return $html;
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}
|
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|
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// Find the closing `</head>` tag.
|
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$head_end = strpos( $head_html, '</head>' );
|
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if ( false === $head_end ) {
|
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// Didn't find it. Find the opening `<body>` tag.
|
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$head_end = strpos( $head_html, '<body' );
|
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|
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// Didn't find it. Return the original HTML.
|
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if ( false === $head_end ) {
|
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return $html;
|
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}
|
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}
|
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|
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// Extract the HTML from opening tag to the closing tag. Then add the closing tag.
|
|
$head_html = substr( $head_html, $head_start, $head_end );
|
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$head_html .= '</head>';
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|
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return $head_html;
|
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}
|
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|
|
/**
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* Gets all the `<meta>` elements that have a `content` attribute.
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*
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* @since 5.9.0
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*
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* @param string $html The string of HTML to be parsed.
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* @return array {
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* A multi-dimensional indexed array on success, else empty array.
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*
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* @type string[] 0 Meta elements with a content attribute.
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* @type string[] 1 Content attribute's opening quotation mark.
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* @type string[] 2 Content attribute's value for each meta element.
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* }
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*/
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private function get_meta_with_content_elements( $html ) {
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/*
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* Parse all meta elements with a content attribute.
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*
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* Why first search for the content attribute rather than directly searching for name=description element?
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* tl;dr The content attribute's value will be truncated when it contains a > symbol.
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*
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* The content attribute's value (i.e. the description to get) can have HTML in it and be well-formed as
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* it's a string to the browser. Imagine what happens when attempting to match for the name=description
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* first. Hmm, if a > or /> symbol is in the content attribute's value, then it terminates the match
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* as the element's closing symbol. But wait, it's in the content attribute and is not the end of the
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* element. This is a limitation of using regex. It can't determine "wait a minute this is inside of quotation".
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* If this happens, what gets matched is not the entire element or all of the content.
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*
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* Why not search for the name=description and then content="(.*)"?
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* The attribute order could be opposite. Plus, additional attributes may exist including being between
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* the name and content attributes.
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*
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* Why not lookahead?
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* Lookahead is not constrained to stay within the element. The first <meta it finds may not include
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* the name or content, but rather could be from a different element downstream.
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*/
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$pattern = '#<meta\s' .
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/*
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* Allows for additional attributes before the content attribute.
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* Searches for anything other than > symbol.
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*/
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'[^>]*' .
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/*
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* Find the content attribute. When found, capture its value (.*).
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*
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* Allows for (a) single or double quotes and (b) whitespace in the value.
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*
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* Why capture the opening quotation mark, i.e. (["\']), and then backreference,
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* i.e \1, for the closing quotation mark?
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* To ensure the closing quotation mark matches the opening one. Why? Attribute values
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* can contain quotation marks, such as an apostrophe in the content.
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*/
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'content=(["\']??)(.*)\1' .
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/*
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* Allows for additional attributes after the content attribute.
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* Searches for anything other than > symbol.
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*/
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'[^>]*' .
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/*
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* \/?> searches for the closing > symbol, which can be in either /> or > format.
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* # ends the pattern.
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*/
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'\/?>#' .
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/*
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* These are the options:
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* - i : case insensitive
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* - s : allows newline characters for the . match (needed for multiline elements)
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* - U means non-greedy matching
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*/
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'isU';
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preg_match_all( $pattern, $html, $elements );
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return $elements;
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}
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/**
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* Gets the metadata from a target meta element.
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*
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* @since 5.9.0
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*
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|
* @param array $meta_elements {
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|
* A multi-dimensional indexed array on success, else empty array.
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|
*
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* @type string[] 0 Meta elements with a content attribute.
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* @type string[] 1 Content attribute's opening quotation mark.
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* @type string[] 2 Content attribute's value for each meta element.
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* }
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* @param string $attr Attribute that identifies the element with the target metadata.
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* @param string $attr_value The attribute's value that identifies the element with the target metadata.
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* @return string The metadata on success. Empty string if not found.
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*/
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private function get_metadata_from_meta_element( $meta_elements, $attr, $attr_value ) {
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// Bail out if there are no meta elements.
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if ( empty( $meta_elements[0] ) ) {
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return '';
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}
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|
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$metadata = '';
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$pattern = '#' .
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/*
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* Target this attribute and value to find the metadata element.
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*
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* Allows for (a) no, single, double quotes and (b) whitespace in the value.
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*
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|
* Why capture the opening quotation mark, i.e. (["\']), and then backreference,
|
|
* i.e \1, for the closing quotation mark?
|
|
* To ensure the closing quotation mark matches the opening one. Why? Attribute values
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* can contain quotation marks, such as an apostrophe in the content.
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*/
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$attr . '=([\"\']??)\s*' . $attr_value . '\s*\1' .
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|
|
|
/*
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|
* These are the options:
|
|
* - i : case insensitive
|
|
* - s : allows newline characters for the . match (needed for multiline elements)
|
|
* - U means non-greedy matching
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|
*/
|
|
'#isU';
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|
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// Find the metadata element.
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foreach ( $meta_elements[0] as $index => $element ) {
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preg_match( $pattern, $element, $match );
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|
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// This is not the metadata element. Skip it.
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|
if ( empty( $match ) ) {
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continue;
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}
|
|
|
|
/*
|
|
* Found the metadata element.
|
|
* Get the metadata from its matching content array.
|
|
*/
|
|
if ( isset( $meta_elements[2][ $index ] ) && is_string( $meta_elements[2][ $index ] ) ) {
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|
$metadata = trim( $meta_elements[2][ $index ] );
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|
}
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|
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break;
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}
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|
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return $metadata;
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}
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}
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