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<?php
/**
* REST API functions.
*
* @package WordPress
* @subpackage REST_API
* @since 4.4.0
*/
/**
* Version number for our API.
*
* @var string
*/
define( 'REST_API_VERSION', '2.0' );
/**
* Registers a REST API route.
*
* @since 4.4.0
*
* @global WP_REST_Server $wp_rest_server ResponseHandler instance (usually WP_REST_Server).
*
* @param string $namespace The first URL segment after core prefix. Should be unique to your package/plugin.
* @param string $route The base URL for route you are adding.
* @param array $args Optional. Either an array of options for the endpoint, or an array of arrays for
* multiple methods. Default empty array.
* @param bool $override Optional. If the route already exists, should we override it? True overrides,
* false merges (with newer overriding if duplicate keys exist). Default false.
* @return bool True on success, false on error.
*/
function register_rest_route( $namespace, $route, $args = array(), $override = false ) {
/** @var WP_REST_Server $wp_rest_server */
global $wp_rest_server;
if ( empty( $namespace ) ) {
/*
* Non-namespaced routes are not allowed, with the exception of the main
* and namespace indexes. If you really need to register a
* non-namespaced route, call `WP_REST_Server::register_route` directly.
*/
_doing_it_wrong( 'register_rest_route', 'Routes must be namespaced with plugin or theme name and version.', '4.4.0' );
return false;
} else if ( empty( $route ) ) {
_doing_it_wrong( 'register_rest_route', 'Route must be specified.', '4.4.0' );
return false;
}
if ( isset( $args['callback'] ) ) {
// Upgrade a single set to multiple.
$args = array( $args );
}
$defaults = array(
'methods' => 'GET',
'callback' => null,
'args' => array(),
);
foreach ( $args as $key => &$arg_group ) {
if ( ! is_numeric( $arg_group ) ) {
// Route option, skip here.
continue;
}
$arg_group = array_merge( $defaults, $arg_group );
}
$full_route = '/' . trim( $namespace, '/' ) . '/' . trim( $route, '/' );
$wp_rest_server->register_route( $namespace, $full_route, $args, $override );
return true;
}
/**
* Registers rewrite rules for the API.
*
* @since 4.4.0
*
* @see rest_api_register_rewrites()
* @global WP $wp Current WordPress environment instance.
*/
function rest_api_init() {
rest_api_register_rewrites();
global $wp;
$wp->add_query_var( 'rest_route' );
}
/**
* Adds REST rewrite rules.
*
* @since 4.4.0
*
* @see add_rewrite_rule()
*/
function rest_api_register_rewrites() {
add_rewrite_rule( '^' . rest_get_url_prefix() . '/?$','index.php?rest_route=/','top' );
add_rewrite_rule( '^' . rest_get_url_prefix() . '/(.*)?','index.php?rest_route=/$matches[1]','top' );
}
/**
* Registers the default REST API filters.
*
* Attached to the {@see 'rest_api_init'} action
* to make testing and disabling these filters easier.
*
* @since 4.4.0
*/
function rest_api_default_filters() {
// Deprecated reporting.
add_action( 'deprecated_function_run', 'rest_handle_deprecated_function', 10, 3 );
add_filter( 'deprecated_function_trigger_error', '__return_false' );
add_action( 'deprecated_argument_run', 'rest_handle_deprecated_argument', 10, 3 );
add_filter( 'deprecated_argument_trigger_error', '__return_false' );
// Default serving.
add_filter( 'rest_pre_serve_request', 'rest_send_cors_headers' );
add_filter( 'rest_post_dispatch', 'rest_send_allow_header', 10, 3 );
add_filter( 'rest_pre_dispatch', 'rest_handle_options_request', 10, 3 );
}
/**
* Loads the REST API.
*
* @since 4.4.0
*
* @global WP $wp Current WordPress environment instance.
* @global WP_REST_Server $wp_rest_server ResponseHandler instance (usually WP_REST_Server).
*/
function rest_api_loaded() {
if ( empty( $GLOBALS['wp']->query_vars['rest_route'] ) ) {
return;
}
/**
* Whether this is a REST Request.
*
* @since 4.4.0
* @var bool
*/
define( 'REST_REQUEST', true );
/** @var WP_REST_Server $wp_rest_server */
global $wp_rest_server;
/**
* Filter the REST Server Class.
*
* This filter allows you to adjust the server class used by the API, using a
* different class to handle requests.
*
* @since 4.4.0
*
* @param string $class_name The name of the server class. Default 'WP_REST_Server'.
*/
$wp_rest_server_class = apply_filters( 'wp_rest_server_class', 'WP_REST_Server' );
$wp_rest_server = new $wp_rest_server_class;
/**
* Fires when preparing to serve an API request.
*
* Endpoint objects should be created and register their hooks on this action rather
* than another action to ensure they're only loaded when needed.
*
* @since 4.4.0
*
* @param WP_REST_Server $wp_rest_server Server object.
*/
do_action( 'rest_api_init', $wp_rest_server );
// Fire off the request.
$wp_rest_server->serve_request( $GLOBALS['wp']->query_vars['rest_route'] );
// We're done.
die();
}
/**
* Retrieves the URL prefix for any API resource.
*
* @since 4.4.0
*
* @return string Prefix.
*/
function rest_get_url_prefix() {
/**
* Filter the REST URL prefix.
*
* @since 4.4.0
*
* @param string $prefix URL prefix. Default 'wp-json'.
*/
return apply_filters( 'rest_url_prefix', 'wp-json' );
}
/**
* Retrieves the URL to a REST endpoint on a site.
*
* Note: The returned URL is NOT escaped.
*
* @since 4.4.0
*
* @todo Check if this is even necessary
*
* @param int $blog_id Optional. Blog ID. Default of null returns URL for current blog.
* @param string $path Optional. REST route. Default '/'.
* @param string $scheme Optional. Sanitization scheme. Default 'rest'.
* @return string Full URL to the endpoint.
*/
function get_rest_url( $blog_id = null, $path = '/', $scheme = 'rest' ) {
if ( empty( $path ) ) {
$path = '/';
}
if ( is_multisite() && get_blog_option( $blog_id, 'permalink_structure' ) || get_option( 'permalink_structure' ) ) {
$url = get_home_url( $blog_id, rest_get_url_prefix(), $scheme );
$url .= '/' . ltrim( $path, '/' );
} else {
$url = trailingslashit( get_home_url( $blog_id, '', $scheme ) );
$path = '/' . ltrim( $path, '/' );
$url = add_query_arg( 'rest_route', $path, $url );
}
if ( is_ssl() ) {
// If the current host is the same as the REST URL host, force the REST URL scheme to HTTPS.
if ( $_SERVER['SERVER_NAME'] === parse_url( get_home_url( $blog_id ), PHP_URL_HOST ) ) {
$url = set_url_scheme( $url, 'https' );
}
}
/**
* Filter the REST URL.
*
* Use this filter to adjust the url returned by the `get_rest_url` function.
*
* @since 4.4.0
*
* @param string $url REST URL.
* @param string $path REST route.
* @param int $blog_id Blog ID.
* @param string $scheme Sanitization scheme.
*/
return apply_filters( 'rest_url', $url, $path, $blog_id, $scheme );
}
/**
* Retrieves the URL to a REST endpoint.
*
* Note: The returned URL is NOT escaped.
*
* @since 4.4.0
*
* @param string $path Optional. REST route. Default empty.
* @param string $scheme Optional. Sanitization scheme. Default 'json'.
* @return string Full URL to the endpoint.
*/
function rest_url( $path = '', $scheme = 'json' ) {
return get_rest_url( null, $path, $scheme );
}
/**
* Do a REST request.
*
* Used primarily to route internal requests through WP_REST_Server.
*
* @since 4.4.0
*
* @global WP_REST_Server $wp_rest_server ResponseHandler instance (usually WP_REST_Server).
*
* @param WP_REST_Request|string $request Request.
* @return WP_REST_Response REST response.
*/
function rest_do_request( $request ) {
global $wp_rest_server;
$request = rest_ensure_request( $request );
return $wp_rest_server->dispatch( $request );
}
/**
* Ensures request arguments are a request object (for consistency).
*
* @since 4.4.0
*
* @param array|WP_REST_Request $request Request to check.
* @return WP_REST_Request REST request instance.
*/
function rest_ensure_request( $request ) {
if ( $request instanceof WP_REST_Request ) {
return $request;
}
return new WP_REST_Request( 'GET', '', $request );
}
/**
* Ensures a REST response is a response object (for consistency).
*
* This implements WP_HTTP_Response, allowing usage of `set_status`/`header`/etc
* without needing to double-check the object. Will also allow WP_Error to indicate error
* responses, so users should immediately check for this value.
*
* @since 4.4.0
*
* @param WP_Error|WP_HTTP_Response|mixed $response Response to check.
* @return mixed WP_Error if response generated an error, WP_HTTP_Response if response
* is a already an instance, otherwise returns a new WP_REST_Response instance.
*/
function rest_ensure_response( $response ) {
if ( is_wp_error( $response ) ) {
return $response;
}
if ( $response instanceof WP_HTTP_Response ) {
return $response;
}
return new WP_REST_Response( $response );
}
/**
* Handles _deprecated_function() errors.
*
* @since 4.4.0
*
* @param string $function Function name.
* @param string $replacement Replacement function name.
* @param string $version Version.
*/
function rest_handle_deprecated_function( $function, $replacement, $version ) {
if ( ! empty( $replacement ) ) {
/* translators: 1: function name, 2: WordPress version number, 3: new function name */
$string = sprintf( __( '%1$s (since %2$s; use %3$s instead)' ), $function, $version, $replacement );
} else {
/* translators: 1: function name, 2: WordPress version number */
$string = sprintf( __( '%1$s (since %2$s; no alternative available)' ), $function, $version );
}
header( sprintf( 'X-WP-DeprecatedFunction: %s', $string ) );
}
/**
* Handles _deprecated_argument() errors.
*
* @since 4.4.0
*
* @param string $function Function name.
* @param string $replacement Replacement function name.
* @param string $version Version.
*/
function rest_handle_deprecated_argument( $function, $replacement, $version ) {
if ( ! empty( $replacement ) ) {
/* translators: 1: function name, 2: WordPress version number, 3: new argument name */
$string = sprintf( __( '%1$s (since %2$s; %3$s)' ), $function, $version, $replacement );
} else {
/* translators: 1: function name, 2: WordPress version number */
$string = sprintf( __( '%1$s (since %2$s; no alternative available)' ), $function, $version );
}
header( sprintf( 'X-WP-DeprecatedParam: %s', $string ) );
}
/**
* Sends Cross-Origin Resource Sharing headers with API requests.
*
* @since 4.4.0
*
* @param mixed $value Response data.
* @return mixed Response data.
*/
function rest_send_cors_headers( $value ) {
$origin = get_http_origin();
if ( $origin ) {
header( 'Access-Control-Allow-Origin: ' . esc_url_raw( $origin ) );
header( 'Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, DELETE' );
header( 'Access-Control-Allow-Credentials: true' );
}
return $value;
}
/**
* Handles OPTIONS requests for the server.
*
* This is handled outside of the server code, as it doesn't obey normal route
* mapping.
*
* @since 4.4.0
*
* @param mixed $response Current response, either response or `null` to indicate pass-through.
* @param WP_REST_Server $handler ResponseHandler instance (usually WP_REST_Server).
* @param WP_REST_Request $request The request that was used to make current response.
* @return WP_REST_Response Modified response, either response or `null` to indicate pass-through.
*/
function rest_handle_options_request( $response, $handler, $request ) {
if ( ! empty( $response ) || $request->get_method() !== 'OPTIONS' ) {
return $response;
}
$response = new WP_REST_Response();
$data = array();
$accept = array();
foreach ( $handler->get_routes() as $route => $endpoints ) {
$match = preg_match( '@^' . $route . '$@i', $request->get_route(), $args );
if ( ! $match ) {
continue;
}
$data = $handler->get_data_for_route( $route, $endpoints, 'help' );
$accept = array_merge( $accept, $data['methods'] );
break;
}
$response->header( 'Accept', implode( ', ', $accept ) );
$response->set_data( $data );
return $response;
}
/**
* Sends the "Allow" header to state all methods that can be sent to the current route.
*
* @since 4.4.0
*
* @param WP_REST_Response $response Current response being served.
* @param WP_REST_Server $server ResponseHandler instance (usually WP_REST_Server).
* @param WP_REST_Request $request The request that was used to make current response.
* @return WP_REST_Response Response to be served, with "Allow" header if route has allowed methods.
*/
function rest_send_allow_header( $response, $server, $request ) {
$matched_route = $response->get_matched_route();
if ( ! $matched_route ) {
return $response;
}
$routes = $server->get_routes();
$allowed_methods = array();
// Get the allowed methods across the routes.
foreach ( $routes[ $matched_route ] as $_handler ) {
foreach ( $_handler['methods'] as $handler_method => $value ) {
if ( ! empty( $_handler['permission_callback'] ) ) {
$permission = call_user_func( $_handler['permission_callback'], $request );
$allowed_methods[ $handler_method ] = true === $permission;
} else {
$allowed_methods[ $handler_method ] = true;
}
}
}
// Strip out all the methods that are not allowed (false values).
$allowed_methods = array_filter( $allowed_methods );
if ( $allowed_methods ) {
$response->header( 'Allow', implode( ', ', array_map( 'strtoupper', array_keys( $allowed_methods ) ) ) );
}
return $response;
}
/**
* Adds the REST API URL to the WP RSD endpoint.
*
* @since 4.4.0
*
* @see get_rest_url()
*/
function rest_output_rsd() {
$api_root = get_rest_url();
if ( empty( $api_root ) ) {
return;
}
?>
<api name="WP-API" blogID="1" preferred="false" apiLink="<?php echo esc_url( $api_root ); ?>" />
<?php
}
/**
* Outputs the REST API link tag into page header.
*
* @since 4.4.0
*
* @see get_rest_url()
*/
function rest_output_link_wp_head() {
$api_root = get_rest_url();
if ( empty( $api_root ) ) {
return;
}
echo "<link rel='https://api.w.org/' href='" . esc_url( $api_root ) . "' />\n";
}
/**
* Sends a Link header for the REST API.
*
* @since 4.4.0
*/
function rest_output_link_header() {
if ( headers_sent() ) {
return;
}
$api_root = get_rest_url();
if ( empty( $api_root ) ) {
return;
}
header( 'Link: <' . esc_url_raw( $api_root ) . '>; rel="https://api.w.org/"', false );
}
/**
* Checks for errors when using cookie-based authentication.
*
* WordPress' built-in cookie authentication is always active
* for logged in users. However, the API has to check nonces
* for each request to ensure users are not vulnerable to CSRF.
*
* @since 4.4.0
*
* @global mixed $wp_rest_auth_cookie
*
* @param WP_Error|mixed $result Error from another authentication handler, null if we should handle it,
* or another value if not.
* @return WP_Error|mixed|bool WP_Error if the cookie is invalid, the $result, otherwise true.
*/
function rest_cookie_check_errors( $result ) {
if ( ! empty( $result ) ) {
return $result;
}
global $wp_rest_auth_cookie;
/*
* Is cookie authentication being used? (If we get an auth
* error, but we're still logged in, another authentication
* must have been used).
*/
if ( true !== $wp_rest_auth_cookie && is_user_logged_in() ) {
return $result;
}
// Determine if there is a nonce.
$nonce = null;
if ( isset( $_REQUEST['_wpnonce'] ) ) {
$nonce = $_REQUEST['_wpnonce'];
} elseif ( isset( $_SERVER['HTTP_X_WP_NONCE'] ) ) {
$nonce = $_SERVER['HTTP_X_WP_NONCE'];
}
if ( null === $nonce ) {
// No nonce at all, so act as if it's an unauthenticated request.
wp_set_current_user( 0 );
return true;
}
// Check the nonce.
$result = wp_verify_nonce( $nonce, 'wp_rest' );
if ( ! $result ) {
return new WP_Error( 'rest_cookie_invalid_nonce', __( 'Cookie nonce is invalid' ), array( 'status' => 403 ) );
}
return true;
}
/**
* Collects cookie authentication status.
*
* Collects errors from wp_validate_auth_cookie for use by rest_cookie_check_errors.
*
* @since 4.4.0
*
* @see current_action()
* @global mixed $wp_rest_auth_cookie
*/
function rest_cookie_collect_status() {
global $wp_rest_auth_cookie;
$status_type = current_action();
if ( 'auth_cookie_valid' !== $status_type ) {
$wp_rest_auth_cookie = substr( $status_type, 12 );
return;
}
$wp_rest_auth_cookie = true;
}
/**
* Parses an RFC3339 timestamp into a DateTime.
*
* @since 4.4.0
*
* @param string $date RFC3339 timestamp.
* @param bool $force_utc Optional. Whether to force UTC timezone instead of using
* the timestamp's timezone. Default false.
* @return DateTime DateTime instance.
*/
function rest_parse_date( $date, $force_utc = false ) {
if ( $force_utc ) {
$date = preg_replace( '/[+-]\d+:?\d+$/', '+00:00', $date );
}
$regex = '#^\d{4}-\d{2}-\d{2}[Tt ]\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|[+-]\d{2}(?::\d{2})?)?$#';
if ( ! preg_match( $regex, $date, $matches ) ) {
return false;
}
return strtotime( $date );
}
/**
* Retrieves a local date with its GMT equivalent, in MySQL datetime format.
*
* @since 4.4.0
*
* @see rest_parse_date()
*
* @param string $date RFC3339 timestamp.
* @param bool $force_utc Whether a UTC timestamp should be forced. Default false.
* @return array|null Local and UTC datetime strings, in MySQL datetime format (Y-m-d H:i:s),
* null on failure.
*/
function rest_get_date_with_gmt( $date, $force_utc = false ) {
$date = rest_parse_date( $date, $force_utc );
if ( empty( $date ) ) {
return null;
}
$utc = date( 'Y-m-d H:i:s', $date );
$local = get_date_from_gmt( $utc );
return array( $local, $utc );
}
