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7757d04ce3
This allows sites to use an admin area over HTTPS with the front end over HTTP, and not end up with a cross-protocol problem when using the REST API URL in the admin area. Fixes #34299 Built from https://develop.svn.wordpress.org/trunk@35351 git-svn-id: http://core.svn.wordpress.org/trunk@35317 1a063a9b-81f0-0310-95a4-ce76da25c4cd
678 lines
19 KiB
PHP
678 lines
19 KiB
PHP
<?php
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/**
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* REST API functions.
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*
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* @package WordPress
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* @subpackage REST_API
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* @since 4.4.0
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*/
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/**
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* Registers a REST API route.
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*
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* @since 4.4.0
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*
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* @global WP_REST_Server $wp_rest_server ResponseHandler instance (usually WP_REST_Server).
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*
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* @param string $namespace The first URL segment after core prefix. Should be unique to your package/plugin.
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* @param string $route The base URL for route you are adding.
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* @param array $args Optional. Either an array of options for the endpoint, or an array of arrays for
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* multiple methods. Default empty array.
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* @param bool $override Optional. If the route already exists, should we override it? True overrides,
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* false merges (with newer overriding if duplicate keys exist). Default false.
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*/
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function register_rest_route( $namespace, $route, $args = array(), $override = false ) {
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/** @var WP_REST_Server $wp_rest_server */
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global $wp_rest_server;
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if ( isset( $args['callback'] ) ) {
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// Upgrade a single set to multiple.
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$args = array( $args );
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}
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$defaults = array(
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'methods' => 'GET',
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'callback' => null,
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'args' => array(),
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);
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foreach ( $args as $key => &$arg_group ) {
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if ( ! is_numeric( $arg_group ) ) {
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// Route option, skip here.
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continue;
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}
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$arg_group = array_merge( $defaults, $arg_group );
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}
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if ( $namespace ) {
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$full_route = '/' . trim( $namespace, '/' ) . '/' . trim( $route, '/' );
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} else {
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/*
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* Non-namespaced routes are not allowed, with the exception of the main
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* and namespace indexes. If you really need to register a
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* non-namespaced route, call `WP_REST_Server::register_route` directly.
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*/
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_doing_it_wrong( 'register_rest_route', 'Routes must be namespaced with plugin name and version', 'WPAPI-2.0' );
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$full_route = '/' . trim( $route, '/' );
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}
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$wp_rest_server->register_route( $namespace, $full_route, $args, $override );
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}
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/**
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* Registers a new field on an existing WordPress object type.
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*
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* @since 4.4.0
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*
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* @global array $wp_rest_additional_fields Holds registered fields, organized
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* by object type.
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*
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* @param string|array $object_type Object(s) the field is being registered
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* to, "post"|"term"|"comment" etc.
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* @param string $attribute The attribute name.
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* @param array $args {
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* Optional. An array of arguments used to handle the registered field.
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*
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* @type string|array|null $get_callback Optional. The callback function used to retrieve the field
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* value. Default is 'null', the field will not be returned in
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* the response.
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* @type string|array|null $update_callback Optional. The callback function used to set and update the
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* field value. Default is 'null', the value cannot be set or
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* updated.
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* @type string|array|null $schema Optional. The callback function used to create the schema for
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* this field. Default is 'null', no schema entry will be returned.
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* }
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*/
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function register_api_field( $object_type, $attribute, $args = array() ) {
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$defaults = array(
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'get_callback' => null,
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'update_callback' => null,
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'schema' => null,
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);
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$args = wp_parse_args( $args, $defaults );
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global $wp_rest_additional_fields;
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$object_types = (array) $object_type;
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foreach ( $object_types as $object_type ) {
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$wp_rest_additional_fields[ $object_type ][ $attribute ] = $args;
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}
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}
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/**
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* Registers rewrite rules for the API.
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*
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* @since 4.4.0
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*
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* @see rest_api_register_rewrites()
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* @global WP $wp Current WordPress environment instance.
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*/
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function rest_api_init() {
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rest_api_register_rewrites();
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global $wp;
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$wp->add_query_var( 'rest_route' );
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}
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/**
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* Adds REST rewrite rules.
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*
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* @since 4.4.0
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*
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* @see add_rewrite_rule()
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*/
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function rest_api_register_rewrites() {
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add_rewrite_rule( '^' . rest_get_url_prefix() . '/?$','index.php?rest_route=/','top' );
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add_rewrite_rule( '^' . rest_get_url_prefix() . '/(.*)?','index.php?rest_route=/$matches[1]','top' );
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}
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/**
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* Registers the default REST API filters.
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*
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* @since 4.4.0
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*
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* @internal This will live in default-filters.php
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*/
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function rest_api_default_filters() {
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// Deprecated reporting.
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add_action( 'deprecated_function_run', 'rest_handle_deprecated_function', 10, 3 );
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add_filter( 'deprecated_function_trigger_error', '__return_false' );
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add_action( 'deprecated_argument_run', 'rest_handle_deprecated_argument', 10, 3 );
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add_filter( 'deprecated_argument_trigger_error', '__return_false' );
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// Default serving.
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add_filter( 'rest_pre_serve_request', 'rest_send_cors_headers' );
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add_filter( 'rest_post_dispatch', 'rest_send_allow_header', 10, 3 );
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add_filter( 'rest_pre_dispatch', 'rest_handle_options_request', 10, 3 );
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}
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/**
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* Loads the REST API.
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*
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* @since 4.4.0
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*
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* @global WP $wp Current WordPress environment instance.
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* @global WP_REST_Server $wp_rest_server ResponseHandler instance (usually WP_REST_Server).
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*/
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function rest_api_loaded() {
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if ( empty( $GLOBALS['wp']->query_vars['rest_route'] ) ) {
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return;
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}
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/**
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* Whether this is a REST Request.
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*
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* @since 4.4.0
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* @var bool
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*/
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define( 'REST_REQUEST', true );
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/** @var WP_REST_Server $wp_rest_server */
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global $wp_rest_server;
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/**
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* Filter the REST Server Class.
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*
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* This filter allows you to adjust the server class used by the API, using a
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* different class to handle requests.
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*
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* @since 4.4.0
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*
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* @param string $class_name The name of the server class. Default 'WP_REST_Server'.
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*/
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$wp_rest_server_class = apply_filters( 'wp_rest_server_class', 'WP_REST_Server' );
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$wp_rest_server = new $wp_rest_server_class;
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/**
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* Fires when preparing to serve an API request.
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*
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* Endpoint objects should be created and register their hooks on this action rather
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* than another action to ensure they're only loaded when needed.
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*
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* @since 4.4.0
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*
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* @param WP_REST_Server $wp_rest_server Server object.
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*/
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do_action( 'rest_api_init', $wp_rest_server );
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// Fire off the request.
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$wp_rest_server->serve_request( $GLOBALS['wp']->query_vars['rest_route'] );
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// We're done.
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die();
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}
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/**
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* Retrieves the URL prefix for any API resource.
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*
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* @since 4.4.0
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*
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* @return string Prefix.
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*/
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function rest_get_url_prefix() {
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/**
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* Filter the REST URL prefix.
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*
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* @since 4.4.0
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*
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* @param string $prefix URL prefix. Default 'wp-json'.
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*/
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return apply_filters( 'rest_url_prefix', 'wp-json' );
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}
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/**
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* Retrieves the URL to a REST endpoint on a site.
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*
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* Note: The returned URL is NOT escaped.
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*
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* @since 4.4.0
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*
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* @todo Check if this is even necessary
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*
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* @param int $blog_id Optional. Blog ID. Default of null returns URL for current blog.
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* @param string $path Optional. REST route. Default '/'.
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* @param string $scheme Optional. Sanitization scheme. Default 'rest'.
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* @return string Full URL to the endpoint.
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*/
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function get_rest_url( $blog_id = null, $path = '/', $scheme = 'rest' ) {
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if ( empty( $path ) ) {
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$path = '/';
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}
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if ( is_multisite() && get_blog_option( $blog_id, 'permalink_structure' ) || get_option( 'permalink_structure' ) ) {
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$url = get_home_url( $blog_id, rest_get_url_prefix(), $scheme );
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$url .= '/' . ltrim( $path, '/' );
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} else {
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$url = trailingslashit( get_home_url( $blog_id, '', $scheme ) );
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$path = '/' . ltrim( $path, '/' );
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$url = add_query_arg( 'rest_route', $path, $url );
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}
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if ( is_ssl() ) {
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// If the current host is the same as the REST URL host, force the REST URL scheme to HTTPS
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if ( $_SERVER['SERVER_NAME'] === parse_url( get_home_url( $blog_id ), PHP_URL_HOST ) ) {
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$url = set_url_scheme( $url, 'https' );
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}
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}
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/**
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* Filter the REST URL.
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*
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* Use this filter to adjust the url returned by the `get_rest_url` function.
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*
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* @since 4.4.0
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*
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* @param string $url REST URL.
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* @param string $path REST route.
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* @param int $blog_id Blog ID.
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* @param string $scheme Sanitization scheme.
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*/
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return apply_filters( 'rest_url', $url, $path, $blog_id, $scheme );
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}
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/**
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* Retrieves the URL to a REST endpoint.
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*
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* Note: The returned URL is NOT escaped.
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*
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* @since 4.4.0
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*
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* @param string $path Optional. REST route. Default empty.
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* @param string $scheme Optional. Sanitization scheme. Default 'json'.
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* @return string Full URL to the endpoint.
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*/
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function rest_url( $path = '', $scheme = 'json' ) {
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return get_rest_url( null, $path, $scheme );
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}
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/**
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* Do a REST request.
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*
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* Used primarily to route internal requests through WP_REST_Server.
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*
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* @since 4.4.0
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*
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* @global WP_REST_Server $wp_rest_server ResponseHandler instance (usually WP_REST_Server).
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*
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* @param WP_REST_Request|string $request Request.
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* @return WP_REST_Response REST response.
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*/
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function rest_do_request( $request ) {
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global $wp_rest_server;
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$request = rest_ensure_request( $request );
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return $wp_rest_server->dispatch( $request );
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}
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/**
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* Ensures request arguments are a request object (for consistency).
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*
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* @since 4.4.0
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*
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* @param array|WP_REST_Request $request Request to check.
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* @return WP_REST_Request REST request instance.
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*/
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function rest_ensure_request( $request ) {
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if ( $request instanceof WP_REST_Request ) {
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return $request;
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}
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return new WP_REST_Request( 'GET', '', $request );
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}
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/**
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* Ensures a REST response is a response object (for consistency).
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*
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* This implements WP_HTTP_Response, allowing usage of `set_status`/`header`/etc
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* without needing to double-check the object. Will also allow WP_Error to indicate error
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* responses, so users should immediately check for this value.
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*
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* @since 4.4.0
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*
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* @param WP_Error|WP_HTTP_Response|mixed $response Response to check.
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* @return mixed WP_Error if response generated an error, WP_HTTP_Response if response
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* is a already an instance, otherwise returns a new WP_REST_Response instance.
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*/
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function rest_ensure_response( $response ) {
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if ( is_wp_error( $response ) ) {
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return $response;
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}
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if ( $response instanceof WP_HTTP_Response ) {
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return $response;
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}
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return new WP_REST_Response( $response );
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}
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/**
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* Handles _deprecated_function() errors.
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*
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* @since 4.4.0
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*
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* @param string $function Function name.
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* @param string $replacement Replacement function name.
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* @param string $version Version.
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*/
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function rest_handle_deprecated_function( $function, $replacement, $version ) {
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if ( ! empty( $replacement ) ) {
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$string = sprintf( __( '%1$s (since %2$s; use %3$s instead)' ), $function, $version, $replacement );
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} else {
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$string = sprintf( __( '%1$s (since %2$s; no alternative available)' ), $function, $version );
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}
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header( sprintf( 'X-WP-DeprecatedFunction: %s', $string ) );
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}
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/**
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* Handles _deprecated_argument() errors.
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*
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* @since 4.4.0
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*
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* @param string $function Function name.
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* @param string $replacement Replacement function name.
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* @param string $version Version.
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*/
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function rest_handle_deprecated_argument( $function, $replacement, $version ) {
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if ( ! empty( $replacement ) ) {
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$string = sprintf( __( '%1$s (since %2$s; %3$s)' ), $function, $version, $replacement );
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} else {
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$string = sprintf( __( '%1$s (since %2$s; no alternative available)' ), $function, $version );
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}
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header( sprintf( 'X-WP-DeprecatedParam: %s', $string ) );
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}
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/**
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* Sends Cross-Origin Resource Sharing headers with API requests.
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*
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* @since 4.4.0
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*
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* @param mixed $value Response data.
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* @return mixed Response data.
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*/
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function rest_send_cors_headers( $value ) {
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$origin = get_http_origin();
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if ( $origin ) {
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header( 'Access-Control-Allow-Origin: ' . esc_url_raw( $origin ) );
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header( 'Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, DELETE' );
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header( 'Access-Control-Allow-Credentials: true' );
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}
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return $value;
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}
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/**
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* Handles OPTIONS requests for the server.
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*
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* This is handled outside of the server code, as it doesn't obey normal route
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* mapping.
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*
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* @since 4.4.0
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*
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* @param mixed $response Current response, either response or `null` to indicate pass-through.
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* @param WP_REST_Server $handler ResponseHandler instance (usually WP_REST_Server).
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* @param WP_REST_Request $request The request that was used to make current response.
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* @return WP_REST_Response Modified response, either response or `null` to indicate pass-through.
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*/
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function rest_handle_options_request( $response, $handler, $request ) {
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if ( ! empty( $response ) || $request->get_method() !== 'OPTIONS' ) {
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return $response;
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}
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$response = new WP_REST_Response();
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$data = array();
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$accept = array();
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foreach ( $handler->get_routes() as $route => $endpoints ) {
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$match = preg_match( '@^' . $route . '$@i', $request->get_route(), $args );
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if ( ! $match ) {
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continue;
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}
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$data = $handler->get_data_for_route( $route, $endpoints, 'help' );
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$accept = array_merge( $accept, $data['methods'] );
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break;
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}
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$response->header( 'Accept', implode( ', ', $accept ) );
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$response->set_data( $data );
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return $response;
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}
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/**
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* Sends the "Allow" header to state all methods that can be sent to the current route.
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*
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* @since 4.4.0
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*
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* @param WP_REST_Response $response Current response being served.
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* @param WP_REST_Server $server ResponseHandler instance (usually WP_REST_Server).
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* @param WP_REST_Request $request The request that was used to make current response.
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* @return WP_REST_Response Response to be served, with "Allow" header if route has allowed methods.
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*/
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function rest_send_allow_header( $response, $server, $request ) {
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$matched_route = $response->get_matched_route();
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if ( ! $matched_route ) {
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return $response;
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}
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$routes = $server->get_routes();
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$allowed_methods = array();
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// Get the allowed methods across the routes.
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foreach ( $routes[ $matched_route ] as $_handler ) {
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foreach ( $_handler['methods'] as $handler_method => $value ) {
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if ( ! empty( $_handler['permission_callback'] ) ) {
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$permission = call_user_func( $_handler['permission_callback'], $request );
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$allowed_methods[ $handler_method ] = true === $permission;
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} else {
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$allowed_methods[ $handler_method ] = true;
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}
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}
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}
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// Strip out all the methods that are not allowed (false values).
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$allowed_methods = array_filter( $allowed_methods );
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if ( $allowed_methods ) {
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$response->header( 'Allow', implode( ', ', array_map( 'strtoupper', array_keys( $allowed_methods ) ) ) );
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}
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return $response;
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}
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/**
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* Adds the REST API URL to the WP RSD endpoint.
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*
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* @since 4.4.0
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*
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* @see get_rest_url()
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*/
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function rest_output_rsd() {
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$api_root = get_rest_url();
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if ( empty( $api_root ) ) {
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return;
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}
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?>
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<api name="WP-API" blogID="1" preferred="false" apiLink="<?php echo esc_url( $api_root ); ?>" />
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<?php
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}
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/**
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* Outputs the REST API link tag into page header.
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*
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* @since 4.4.0
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*
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* @see get_rest_url()
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*/
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function rest_output_link_wp_head() {
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$api_root = get_rest_url();
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if ( empty( $api_root ) ) {
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return;
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}
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echo "<link rel='https://github.com/WP-API/WP-API' href='" . esc_url( $api_root ) . "' />\n";
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}
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/**
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* Sends a Link header for the REST API.
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*
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* @since 4.4.0
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*/
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function rest_output_link_header() {
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if ( headers_sent() ) {
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return;
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}
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$api_root = get_rest_url();
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if ( empty( $api_root ) ) {
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return;
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}
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header( 'Link: <' . esc_url_raw( $api_root ) . '>; rel="https://github.com/WP-API/WP-API"', false );
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}
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/**
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* Checks for errors when using cookie-based authentication.
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*
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* WordPress' built-in cookie authentication is always active
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* for logged in users. However, the API has to check nonces
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* for each request to ensure users are not vulnerable to CSRF.
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*
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* @since 4.4.0
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*
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* @global mixed $wp_rest_auth_cookie
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*
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* @param WP_Error|mixed $result Error from another authentication handler, null if we should handle it,
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* or another value if not.
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* @return WP_Error|mixed|bool WP_Error if the cookie is invalid, the $result, otherwise true.
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*/
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function rest_cookie_check_errors( $result ) {
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if ( ! empty( $result ) ) {
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return $result;
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}
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global $wp_rest_auth_cookie;
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/*
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* Is cookie authentication being used? (If we get an auth
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* error, but we're still logged in, another authentication
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* must have been used).
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*/
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if ( true !== $wp_rest_auth_cookie && is_user_logged_in() ) {
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return $result;
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}
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// Determine if there is a nonce.
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$nonce = null;
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if ( isset( $_REQUEST['_wpnonce'] ) ) {
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$nonce = $_REQUEST['_wpnonce'];
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} elseif ( isset( $_SERVER['HTTP_X_WP_NONCE'] ) ) {
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$nonce = $_SERVER['HTTP_X_WP_NONCE'];
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}
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if ( null === $nonce ) {
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// No nonce at all, so act as if it's an unauthenticated request.
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wp_set_current_user( 0 );
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return true;
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}
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// Check the nonce.
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$result = wp_verify_nonce( $nonce, 'wp_rest' );
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if ( ! $result ) {
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return new WP_Error( 'rest_cookie_invalid_nonce', __( 'Cookie nonce is invalid' ), array( 'status' => 403 ) );
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}
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return true;
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}
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/**
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* Collects cookie authentication status.
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*
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* Collects errors from wp_validate_auth_cookie for use by rest_cookie_check_errors.
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*
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* @since 4.4.0
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*
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* @see current_action()
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* @global mixed $wp_rest_auth_cookie
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*/
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function rest_cookie_collect_status() {
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global $wp_rest_auth_cookie;
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$status_type = current_action();
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if ( 'auth_cookie_valid' !== $status_type ) {
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$wp_rest_auth_cookie = substr( $status_type, 12 );
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return;
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}
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$wp_rest_auth_cookie = true;
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}
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/**
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* Parses an RFC3339 timestamp into a DateTime.
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*
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* @since 4.4.0
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*
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* @param string $date RFC3339 timestamp.
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* @param bool $force_utc Optional. Whether to force UTC timezone instead of using
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* the timestamp's timezone. Default false.
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* @return DateTime DateTime instance.
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*/
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function rest_parse_date( $date, $force_utc = false ) {
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if ( $force_utc ) {
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$date = preg_replace( '/[+-]\d+:?\d+$/', '+00:00', $date );
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}
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$regex = '#^\d{4}-\d{2}-\d{2}[Tt ]\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|[+-]\d{2}(?::\d{2})?)?$#';
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if ( ! preg_match( $regex, $date, $matches ) ) {
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return false;
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}
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return strtotime( $date );
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}
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/**
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* Retrieves a local date with its GMT equivalent, in MySQL datetime format.
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*
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* @since 4.4.0
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*
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* @see rest_parse_date()
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*
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* @param string $date RFC3339 timestamp.
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* @param bool $force_utc Whether a UTC timestamp should be forced. Default false.
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* @return array|null Local and UTC datetime strings, in MySQL datetime format (Y-m-d H:i:s),
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* null on failure.
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*/
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function rest_get_date_with_gmt( $date, $force_utc = false ) {
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$date = rest_parse_date( $date, $force_utc );
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if ( empty( $date ) ) {
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return null;
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}
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$utc = date( 'Y-m-d H:i:s', $date );
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$local = get_date_from_gmt( $utc );
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return array( $local, $utc );
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}
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