<?php
/**
 * fsockopen HTTP transport
 *
 * @package Requests
 * @subpackage Transport
 */

/**
 * fsockopen HTTP transport
 *
 * @package Requests
 * @subpackage Transport
 */
class Requests_Transport_fsockopen implements Requests_Transport {
	/**
	 * Second to microsecond conversion
	 *
	 * @var integer
	 */
	const SECOND_IN_MICROSECONDS = 1000000;

	/**
	 * Raw HTTP data
	 *
	 * @var string
	 */
	public $headers = '';

	/**
	 * Stream metadata
	 *
	 * @var array Associative array of properties, see {@see https://secure.php.net/stream_get_meta_data}
	 */
	public $info;

	/**
	 * What's the maximum number of bytes we should keep?
	 *
	 * @var int|bool Byte count, or false if no limit.
	 */
	protected $max_bytes = false;

	protected $connect_error = '';

	/**
	 * Perform a request
	 *
	 * @throws Requests_Exception On failure to connect to socket (`fsockopenerror`)
	 * @throws Requests_Exception On socket timeout (`timeout`)
	 *
	 * @param string $url URL to request
	 * @param array $headers Associative array of request headers
	 * @param string|array $data Data to send either as the POST body, or as parameters in the URL for a GET/HEAD
	 * @param array $options Request options, see {@see Requests::response()} for documentation
	 * @return string Raw HTTP result
	 */
	public function request($url, $headers = array(), $data = array(), $options = array()) {
		$options['hooks']->dispatch('fsockopen.before_request');

		$url_parts = parse_url($url);
		if (empty($url_parts)) {
			throw new Requests_Exception('Invalid URL.', 'invalidurl', $url);
		}
		$host = $url_parts['host'];
		$context = stream_context_create();
		$verifyname = false;
		$case_insensitive_headers = new Requests_Utility_CaseInsensitiveDictionary($headers);

		// HTTPS support
		if (isset($url_parts['scheme']) && strtolower($url_parts['scheme']) === 'https') {
			$remote_socket = 'ssl://' . $host;
			if (!isset($url_parts['port'])) {
				$url_parts['port'] = 443;
			}

			$context_options = array(
				'verify_peer' => true,
				// 'CN_match' => $host,
				'capture_peer_cert' => true
			);
			$verifyname = true;

			// SNI, if enabled (OpenSSL >=0.9.8j)
			if (defined('OPENSSL_TLSEXT_SERVER_NAME') && OPENSSL_TLSEXT_SERVER_NAME) {
				$context_options['SNI_enabled'] = true;
				if (isset($options['verifyname']) && $options['verifyname'] === false) {
					$context_options['SNI_enabled'] = false;
				}
			}

			if (isset($options['verify'])) {
				if ($options['verify'] === false) {
					$context_options['verify_peer'] = false;
				}
				elseif (is_string($options['verify'])) {
					$context_options['cafile'] = $options['verify'];
				}
			}

			if (isset($options['verifyname']) && $options['verifyname'] === false) {
				$context_options['verify_peer_name'] = false;
				$verifyname = false;
			}

			stream_context_set_option($context, array('ssl' => $context_options));
		}
		else {
			$remote_socket = 'tcp://' . $host;
		}

		$this->max_bytes = $options['max_bytes'];

		if (!isset($url_parts['port'])) {
			$url_parts['port'] = 80;
		}
		$remote_socket .= ':' . $url_parts['port'];

		set_error_handler(array($this, 'connect_error_handler'), E_WARNING | E_NOTICE);

		$options['hooks']->dispatch('fsockopen.remote_socket', array(&$remote_socket));

		$socket = stream_socket_client($remote_socket, $errno, $errstr, ceil($options['connect_timeout']), STREAM_CLIENT_CONNECT, $context);

		restore_error_handler();

		if ($verifyname && !$this->verify_certificate_from_context($host, $context)) {
			throw new Requests_Exception('SSL certificate did not match the requested domain name', 'ssl.no_match');
		}

		if (!$socket) {
			if ($errno === 0) {
				// Connection issue
				throw new Requests_Exception(rtrim($this->connect_error), 'fsockopen.connect_error');
			}

			throw new Requests_Exception($errstr, 'fsockopenerror', null, $errno);
		}

		$data_format = $options['data_format'];

		if ($data_format === 'query') {
			$path = self::format_get($url_parts, $data);
			$data = '';
		}
		else {
			$path = self::format_get($url_parts, array());
		}

		$options['hooks']->dispatch('fsockopen.remote_host_path', array(&$path, $url));

		$request_body = '';
		$out = sprintf("%s %s HTTP/%.1F\r\n", $options['type'], $path, $options['protocol_version']);

		if ($options['type'] !== Requests::TRACE) {
			if (is_array($data)) {
				$request_body = http_build_query($data, null, '&');
			}
			else {
				$request_body = $data;
			}

			if (!empty($data)) {
				if (!isset($case_insensitive_headers['Content-Length'])) {
					$headers['Content-Length'] = strlen($request_body);
				}

				if (!isset($case_insensitive_headers['Content-Type'])) {
					$headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8';
				}
			}
		}

		if (!isset($case_insensitive_headers['Host'])) {
			$out .= sprintf('Host: %s', $url_parts['host']);

			if (( 'http' === strtolower($url_parts['scheme']) && $url_parts['port'] !== 80 ) || ( 'https' === strtolower($url_parts['scheme']) && $url_parts['port'] !== 443 )) {
				$out .= ':' . $url_parts['port'];
			}
			$out .= "\r\n";
		}

		if (!isset($case_insensitive_headers['User-Agent'])) {
			$out .= sprintf("User-Agent: %s\r\n", $options['useragent']);
		}

		$accept_encoding = $this->accept_encoding();
		if (!isset($case_insensitive_headers['Accept-Encoding']) && !empty($accept_encoding)) {
			$out .= sprintf("Accept-Encoding: %s\r\n", $accept_encoding);
		}

		$headers = Requests::flatten($headers);

		if (!empty($headers)) {
			$out .= implode("\r\n", $headers) . "\r\n";
		}

		$options['hooks']->dispatch('fsockopen.after_headers', array(&$out));

		if (substr($out, -2) !== "\r\n") {
			$out .= "\r\n";
		}

		if (!isset($case_insensitive_headers['Connection'])) {
			$out .= "Connection: Close\r\n";
		}

		$out .= "\r\n" . $request_body;

		$options['hooks']->dispatch('fsockopen.before_send', array(&$out));

		fwrite($socket, $out);
		$options['hooks']->dispatch('fsockopen.after_send', array($out));

		if (!$options['blocking']) {
			fclose($socket);
			$fake_headers = '';
			$options['hooks']->dispatch('fsockopen.after_request', array(&$fake_headers));
			return '';
		}

		$timeout_sec = (int) floor($options['timeout']);
		if ($timeout_sec == $options['timeout']) {
			$timeout_msec = 0;
		}
		else {
			$timeout_msec = self::SECOND_IN_MICROSECONDS * $options['timeout'] % self::SECOND_IN_MICROSECONDS;
		}
		stream_set_timeout($socket, $timeout_sec, $timeout_msec);

		$response = $body = $headers = '';
		$this->info = stream_get_meta_data($socket);
		$size = 0;
		$doingbody = false;
		$download = false;
		if ($options['filename']) {
			$download = fopen($options['filename'], 'wb');
		}

		while (!feof($socket)) {
			$this->info = stream_get_meta_data($socket);
			if ($this->info['timed_out']) {
				throw new Requests_Exception('fsocket timed out', 'timeout');
			}

			$block = fread($socket, Requests::BUFFER_SIZE);
			if (!$doingbody) {
				$response .= $block;
				if (strpos($response, "\r\n\r\n")) {
					list($headers, $block) = explode("\r\n\r\n", $response, 2);
					$doingbody = true;
				}
			}

			// Are we in body mode now?
			if ($doingbody) {
				$options['hooks']->dispatch('request.progress', array($block, $size, $this->max_bytes));
				$data_length = strlen($block);
				if ($this->max_bytes) {
					// Have we already hit a limit?
					if ($size === $this->max_bytes) {
						continue;
					}
					if (($size + $data_length) > $this->max_bytes) {
						// Limit the length
						$limited_length = ($this->max_bytes - $size);
						$block = substr($block, 0, $limited_length);
					}
				}

				$size += strlen($block);
				if ($download) {
					fwrite($download, $block);
				}
				else {
					$body .= $block;
				}
			}
		}
		$this->headers = $headers;

		if ($download) {
			fclose($download);
		}
		else {
			$this->headers .= "\r\n\r\n" . $body;
		}
		fclose($socket);

		$options['hooks']->dispatch('fsockopen.after_request', array(&$this->headers, &$this->info));
		return $this->headers;
	}

	/**
	 * Send multiple requests simultaneously
	 *
	 * @param array $requests Request data (array of 'url', 'headers', 'data', 'options') as per {@see Requests_Transport::request}
	 * @param array $options Global options, see {@see Requests::response()} for documentation
	 * @return array Array of Requests_Response objects (may contain Requests_Exception or string responses as well)
	 */
	public function request_multiple($requests, $options) {
		$responses = array();
		$class = get_class($this);
		foreach ($requests as $id => $request) {
			try {
				$handler = new $class();
				$responses[$id] = $handler->request($request['url'], $request['headers'], $request['data'], $request['options']);

				$request['options']['hooks']->dispatch('transport.internal.parse_response', array(&$responses[$id], $request));
			}
			catch (Requests_Exception $e) {
				$responses[$id] = $e;
			}

			if (!is_string($responses[$id])) {
				$request['options']['hooks']->dispatch('multiple.request.complete', array(&$responses[$id], $id));
			}
		}

		return $responses;
	}

	/**
	 * Retrieve the encodings we can accept
	 *
	 * @return string Accept-Encoding header value
	 */
	protected static function accept_encoding() {
		$type = array();
		if (function_exists('gzinflate')) {
			$type[] = 'deflate;q=1.0';
		}

		if (function_exists('gzuncompress')) {
			$type[] = 'compress;q=0.5';
		}

		$type[] = 'gzip;q=0.5';

		return implode(', ', $type);
	}

	/**
	 * Format a URL given GET data
	 *
	 * @param array $url_parts
	 * @param array|object $data Data to build query using, see {@see https://secure.php.net/http_build_query}
	 * @return string URL with data
	 */
	protected static function format_get($url_parts, $data) {
		if (!empty($data)) {
			if (empty($url_parts['query'])) {
				$url_parts['query'] = '';
			}

			$url_parts['query'] .= '&' . http_build_query($data, null, '&');
			$url_parts['query'] = trim($url_parts['query'], '&');
		}
		if (isset($url_parts['path'])) {
			if (isset($url_parts['query'])) {
				$get = $url_parts['path'] . '?' . $url_parts['query'];
			}
			else {
				$get = $url_parts['path'];
			}
		}
		else {
			$get = '/';
		}
		return $get;
	}

	/**
	 * Error handler for stream_socket_client()
	 *
	 * @param int $errno Error number (e.g. E_WARNING)
	 * @param string $errstr Error message
	 */
	public function connect_error_handler($errno, $errstr) {
		// Double-check we can handle it
		if (($errno & E_WARNING) === 0 && ($errno & E_NOTICE) === 0) {
			// Return false to indicate the default error handler should engage
			return false;
		}

		$this->connect_error .= $errstr . "\n";
		return true;
	}

	/**
	 * Verify the certificate against common name and subject alternative names
	 *
	 * Unfortunately, PHP doesn't check the certificate against the alternative
	 * names, leading things like 'https://www.github.com/' to be invalid.
	 * Instead
	 *
	 * @see https://tools.ietf.org/html/rfc2818#section-3.1 RFC2818, Section 3.1
	 *
	 * @throws Requests_Exception On failure to connect via TLS (`fsockopen.ssl.connect_error`)
	 * @throws Requests_Exception On not obtaining a match for the host (`fsockopen.ssl.no_match`)
	 * @param string $host Host name to verify against
	 * @param resource $context Stream context
	 * @return bool
	 */
	public function verify_certificate_from_context($host, $context) {
		$meta = stream_context_get_options($context);

		// If we don't have SSL options, then we couldn't make the connection at
		// all
		if (empty($meta) || empty($meta['ssl']) || empty($meta['ssl']['peer_certificate'])) {
			throw new Requests_Exception(rtrim($this->connect_error), 'ssl.connect_error');
		}

		$cert = openssl_x509_parse($meta['ssl']['peer_certificate']);

		return Requests_SSL::verify_certificate($host, $cert);
	}

	/**
	 * Whether this transport is valid
	 *
	 * @codeCoverageIgnore
	 * @return boolean True if the transport is valid, false otherwise.
	 */
	public static function test($capabilities = array()) {
		if (!function_exists('fsockopen')) {
			return false;
		}

		// If needed, check that streams support SSL
		if (isset($capabilities['ssl']) && $capabilities['ssl']) {
			if (!extension_loaded('openssl') || !function_exists('openssl_x509_parse')) {
				return false;
			}

			// Currently broken, thanks to https://github.com/facebook/hhvm/issues/2156
			if (defined('HHVM_VERSION')) {
				return false;
			}
		}

		return true;
	}
}


<?php
/**
 * Case-insensitive dictionary, suitable for HTTP headers
 *
 * @package Requests
 * @subpackage Utilities
 */

/**
 * Case-insensitive dictionary, suitable for HTTP headers
 *
 * @package Requests
 * @subpackage Utilities
 */
class Requests_Utility_CaseInsensitiveDictionary implements ArrayAccess, IteratorAggregate {
	/**
	 * Actual item data
	 *
	 * @var array
	 */
	protected $data = array();

	/**
	 * Creates a case insensitive dictionary.
	 *
	 * @param array $data Dictionary/map to convert to case-insensitive
	 */
	public function __construct(array $data = array()) {
		foreach ($data as $key => $value) {
			$this->offsetSet($key, $value);
		}
	}

	/**
	 * Check if the given item exists
	 *
	 * @param string $key Item key
	 * @return boolean Does the item exist?
	 */
	public function offsetExists($key) {
		$key = strtolower($key);
		return isset($this->data[$key]);
	}

	/**
	 * Get the value for the item
	 *
	 * @param string $key Item key
	 * @return string Item value
	 */
	public function offsetGet($key) {
		$key = strtolower($key);
		if (!isset($this->data[$key])) {
			return null;
		}

		return $this->data[$key];
	}

	/**
	 * Set the given item
	 *
	 * @throws Requests_Exception On attempting to use dictionary as list (`invalidset`)
	 *
	 * @param string $key Item name
	 * @param string $value Item value
	 */
	public function offsetSet($key, $value) {
		if ($key === null) {
			throw new Requests_Exception('Object is a dictionary, not a list', 'invalidset');
		}

		$key = strtolower($key);
		$this->data[$key] = $value;
	}

	/**
	 * Unset the given header
	 *
	 * @param string $key
	 */
	public function offsetUnset($key) {
		unset($this->data[strtolower($key)]);
	}

	/**
	 * Get an iterator for the data
	 *
	 * @return ArrayIterator
	 */
	public function getIterator() {
		return new ArrayIterator($this->data);
	}

	/**
	 * Get the headers as an array
	 *
	 * @return array Header data
	 */
	public function getAll() {
		return $this->data;
	}
}


<?php
/**
 * Iterator for arrays requiring filtered values
 *
 * @package Requests
 * @subpackage Utilities
 */

/**
 * Iterator for arrays requiring filtered values
 *
 * @package Requests
 * @subpackage Utilities
 */
class Requests_Utility_FilteredIterator extends ArrayIterator {
	/**
	 * Callback to run as a filter
	 *
	 * @var callable
	 */
	protected $callback;

	/**
	 * Create a new iterator
	 *
	 * @param array $data
	 * @param callable $callback Callback to be called on each value
	 */
	public function __construct($data, $callback) {
		parent::__construct($data);

		$this->callback = $callback;
	}

	/**
	 * Get the current item's value after filtering
	 *
	 * @return string
	 */
	public function current() {
		$value = parent::current();
		$value = call_user_func($this->callback, $value);
		return $value;
	}

	/**
	 * @inheritdoc
	 */
	public function unserialize( $serialized ) {
	}

	/**
	 * @inheritdoc
	 */
	public function __unserialize( $serialized ) { // phpcs:ignore PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.MethodDoubleUnderscore,PHPCompatibility.FunctionNameRestrictions.NewMagicMethods.__unserializeFound
	}

	public function __wakeup() { // phpcs:ignore PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.MethodDoubleUnderscore,PHPCompatibility.FunctionNameRestrictions.NewMagicMethods.__wakeupFound
		unset( $this->callback );
	}
}


<?php
/**
 * REST API: WP_REST_Request class
 *
 * @package WordPress
 * @subpackage REST_API
 * @since 4.4.0
 */

/**
 * Core class used to implement a REST request object.
 *
 * Contains data from the request, to be passed to the callback.
 *
 * Note: This implements ArrayAccess, and acts as an array of parameters when
 * used in that manner. It does not use ArrayObject (as we cannot rely on SPL),
 * so be aware it may have non-array behaviour in some cases.
 *
 * Note: When using features provided by ArrayAccess, be aware that WordPress deliberately
 * does not distinguish between arguments of the same name for different request methods.
 * For instance, in a request with `GET id=1` and `POST id=2`, `$request['id']` will equal
 * 2 (`POST`) not 1 (`GET`). For more precision between request methods, use
 * WP_REST_Request::get_body_params(), WP_REST_Request::get_url_params(), etc.
 *
 * @since 4.4.0
 *
 * @link https://www.php.net/manual/en/class.arrayaccess.php
 */
class WP_REST_Request implements ArrayAccess {

	/**
	 * HTTP method.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	protected $method = '';

	/**
	 * Parameters passed to the request.
	 *
	 * These typically come from the `$_GET`, `$_POST` and `$_FILES`
	 * superglobals when being created from the global scope.
	 *
	 * @since 4.4.0
	 * @var array Contains GET, POST and FILES keys mapping to arrays of data.
	 */
	protected $params;

	/**
	 * HTTP headers for the request.
	 *
	 * @since 4.4.0
	 * @var array Map of key to value. Key is always lowercase, as per HTTP specification.
	 */
	protected $headers = array();

	/**
	 * Body data.
	 *
	 * @since 4.4.0
	 * @var string Binary data from the request.
	 */
	protected $body = null;

	/**
	 * Route matched for the request.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	protected $route;

	/**
	 * Attributes (options) for the route that was matched.
	 *
	 * This is the options array used when the route was registered, typically
	 * containing the callback as well as the valid methods for the route.
	 *
	 * @since 4.4.0
	 * @var array Attributes for the request.
	 */
	protected $attributes = array();

	/**
	 * Used to determine if the JSON data has been parsed yet.
	 *
	 * Allows lazy-parsing of JSON data where possible.
	 *
	 * @since 4.4.0
	 * @var bool
	 */
	protected $parsed_json = false;

	/**
	 * Used to determine if the body data has been parsed yet.
	 *
	 * @since 4.4.0
	 * @var bool
	 */
	protected $parsed_body = false;

	/**
	 * Constructor.
	 *
	 * @since 4.4.0
	 *
	 * @param string $method     Optional. Request method. Default empty.
	 * @param string $route      Optional. Request route. Default empty.
	 * @param array  $attributes Optional. Request attributes. Default empty array.
	 */
	public function __construct( $method = '', $route = '', $attributes = array() ) {
		$this->params = array(
			'URL'      => array(),
			'GET'      => array(),
			'POST'     => array(),
			'FILES'    => array(),

			// See parse_json_params.
			'JSON'     => null,

			'defaults' => array(),
		);

		$this->set_method( $method );
		$this->set_route( $route );
		$this->set_attributes( $attributes );
	}

	/**
	 * Retrieves the HTTP method for the request.
	 *
	 * @since 4.4.0
	 *
	 * @return string HTTP method.
	 */
	public function get_method() {
		return $this->method;
	}

	/**
	 * Sets HTTP method for the request.
	 *
	 * @since 4.4.0
	 *
	 * @param string $method HTTP method.
	 */
	public function set_method( $method ) {
		$this->method = strtoupper( $method );
	}

	/**
	 * Retrieves all headers from the request.
	 *
	 * @since 4.4.0
	 *
	 * @return array Map of key to value. Key is always lowercase, as per HTTP specification.
	 */
	public function get_headers() {
		return $this->headers;
	}

	/**
	 * Canonicalizes the header name.
	 *
	 * Ensures that header names are always treated the same regardless of
	 * source. Header names are always case insensitive.
	 *
	 * Note that we treat `-` (dashes) and `_` (underscores) as the same
	 * character, as per header parsing rules in both Apache and nginx.
	 *
	 * @link https://stackoverflow.com/q/18185366
	 * @link https://www.nginx.com/resources/wiki/start/topics/tutorials/config_pitfalls/#missing-disappearing-http-headers
	 * @link https://nginx.org/en/docs/http/ngx_http_core_module.html#underscores_in_headers
	 *
	 * @since 4.4.0
	 *
	 * @param string $key Header name.
	 * @return string Canonicalized name.
	 */
	public static function canonicalize_header_name( $key ) {
		$key = strtolower( $key );
		$key = str_replace( '-', '_', $key );

		return $key;
	}

	/**
	 * Retrieves the given header from the request.
	 *
	 * If the header has multiple values, they will be concatenated with a comma
	 * as per the HTTP specification. Be aware that some non-compliant headers
	 * (notably cookie headers) cannot be joined this way.
	 *
	 * @since 4.4.0
	 *
	 * @param string $key Header name, will be canonicalized to lowercase.
	 * @return string|null String value if set, null otherwise.
	 */
	public function get_header( $key ) {
		$key = $this->canonicalize_header_name( $key );

		if ( ! isset( $this->headers[ $key ] ) ) {
			return null;
		}

		return implode( ',', $this->headers[ $key ] );
	}

	/**
	 * Retrieves header values from the request.
	 *
	 * @since 4.4.0
	 *
	 * @param string $key Header name, will be canonicalized to lowercase.
	 * @return array|null List of string values if set, null otherwise.
	 */
	public function get_header_as_array( $key ) {
		$key = $this->canonicalize_header_name( $key );

		if ( ! isset( $this->headers[ $key ] ) ) {
			return null;
		}

		return $this->headers[ $key ];
	}

	/**
	 * Sets the header on request.
	 *
	 * @since 4.4.0
	 *
	 * @param string $key   Header name.
	 * @param string $value Header value, or list of values.
	 */
	public function set_header( $key, $value ) {
		$key   = $this->canonicalize_header_name( $key );
		$value = (array) $value;

		$this->headers[ $key ] = $value;
	}

	/**
	 * Appends a header value for the given header.
	 *
	 * @since 4.4.0
	 *
	 * @param string $key   Header name.
	 * @param string $value Header value, or list of values.
	 */
	public function add_header( $key, $value ) {
		$key   = $this->canonicalize_header_name( $key );
		$value = (array) $value;

		if ( ! isset( $this->headers[ $key ] ) ) {
			$this->headers[ $key ] = array();
		}

		$this->headers[ $key ] = array_merge( $this->headers[ $key ], $value );
	}

	/**
	 * Removes all values for a header.
	 *
	 * @since 4.4.0
	 *
	 * @param string $key Header name.
	 */
	public function remove_header( $key ) {
		$key = $this->canonicalize_header_name( $key );
		unset( $this->headers[ $key ] );
	}

	/**
	 * Sets headers on the request.
	 *
	 * @since 4.4.0
	 *
	 * @param array $headers  Map of header name to value.
	 * @param bool  $override If true, replace the request's headers. Otherwise, merge with existing.
	 */
	public function set_headers( $headers, $override = true ) {
		if ( true === $override ) {
			$this->headers = array();
		}

		foreach ( $headers as $key => $value ) {
			$this->set_header( $key, $value );
		}
	}

	/**
	 * Retrieves the content-type of the request.
	 *
	 * @since 4.4.0
	 *
	 * @return array|null Map containing 'value' and 'parameters' keys
	 *                    or null when no valid content-type header was
	 *                    available.
	 */
	public function get_content_type() {
		$value = $this->get_header( 'content-type' );
		if ( empty( $value ) ) {
			return null;
		}

		$parameters = '';
		if ( strpos( $value, ';' ) ) {
			list( $value, $parameters ) = explode( ';', $value, 2 );
		}

		$value = strtolower( $value );
		if ( false === strpos( $value, '/' ) ) {
			return null;
		}

		// Parse type and subtype out.
		list( $type, $subtype ) = explode( '/', $value, 2 );

		$data = compact( 'value', 'type', 'subtype', 'parameters' );
		$data = array_map( 'trim', $data );

		return $data;
	}

	/**
	 * Retrieves the parameter priority order.
	 *
	 * Used when checking parameters in get_param().
	 *
	 * @since 4.4.0
	 *
	 * @return string[] Array of types to check, in order of priority.
	 */
	protected function get_parameter_order() {
		$order = array();

		$content_type = $this->get_content_type();
		if ( isset( $content_type['value'] ) && 'application/json' === $content_type['value'] ) {
			$order[] = 'JSON';
		}

		$this->parse_json_params();

		// Ensure we parse the body data.
		$body = $this->get_body();

		if ( 'POST' !== $this->method && ! empty( $body ) ) {
			$this->parse_body_params();
		}

		$accepts_body_data = array( 'POST', 'PUT', 'PATCH', 'DELETE' );
		if ( in_array( $this->method, $accepts_body_data, true ) ) {
			$order[] = 'POST';
		}

		$order[] = 'GET';
		$order[] = 'URL';
		$order[] = 'defaults';

		/**
		 * Filters the parameter order.
		 *
		 * The order affects which parameters are checked when using get_param() and family.
		 * This acts similarly to PHP's `request_order` setting.
		 *
		 * @since 4.4.0
		 *
		 * @param string[]        $order Array of types to check, in order of priority.
		 * @param WP_REST_Request $this  The request object.
		 */
		return apply_filters( 'rest_request_parameter_order', $order, $this );
	}

	/**
	 * Retrieves a parameter from the request.
	 *
	 * @since 4.4.0
	 *
	 * @param string $key Parameter name.
	 * @return mixed|null Value if set, null otherwise.
	 */
	public function get_param( $key ) {
		$order = $this->get_parameter_order();

		foreach ( $order as $type ) {
			// Determine if we have the parameter for this type.
			if ( isset( $this->params[ $type ][ $key ] ) ) {
				return $this->params[ $type ][ $key ];
			}
		}

		return null;
	}

	/**
	 * Checks if a parameter exists in the request.
	 *
	 * This allows distinguishing between an omitted parameter,
	 * and a parameter specifically set to null.
	 *
	 * @since 5.3.0
	 *
	 * @param string $key Parameter name.
	 * @return bool True if a param exists for the given key.
	 */
	public function has_param( $key ) {
		$order = $this->get_parameter_order();

		foreach ( $order as $type ) {
			if ( is_array( $this->params[ $type ] ) && array_key_exists( $key, $this->params[ $type ] ) ) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Sets a parameter on the request.
	 *
	 * If the given parameter key exists in any parameter type an update will take place,
	 * otherwise a new param will be created in the first parameter type (respecting
	 * get_parameter_order()).
	 *
	 * @since 4.4.0
	 *
	 * @param string $key   Parameter name.
	 * @param mixed  $value Parameter value.
	 */
	public function set_param( $key, $value ) {
		$order     = $this->get_parameter_order();
		$found_key = false;

		foreach ( $order as $type ) {
			if ( 'defaults' !== $type && is_array( $this->params[ $type ] ) && array_key_exists( $key, $this->params[ $type ] ) ) {
				$this->params[ $type ][ $key ] = $value;
				$found_key                     = true;
			}
		}

		if ( ! $found_key ) {
			$this->params[ $order[0] ][ $key ] = $value;
		}
	}

	/**
	 * Retrieves merged parameters from the request.
	 *
	 * The equivalent of get_param(), but returns all parameters for the request.
	 * Handles merging all the available values into a single array.
	 *
	 * @since 4.4.0
	 *
	 * @return array Map of key to value.
	 */
	public function get_params() {
		$order = $this->get_parameter_order();
		$order = array_reverse( $order, true );

		$params = array();
		foreach ( $order as $type ) {
			// array_merge() / the "+" operator will mess up
			// numeric keys, so instead do a manual foreach.
			foreach ( (array) $this->params[ $type ] as $key => $value ) {
				$params[ $key ] = $value;
			}
		}

		return $params;
	}

	/**
	 * Retrieves parameters from the route itself.
	 *
	 * These are parsed from the URL using the regex.
	 *
	 * @since 4.4.0
	 *
	 * @return array Parameter map of key to value.
	 */
	public function get_url_params() {
		return $this->params['URL'];
	}

	/**
	 * Sets parameters from the route.
	 *
	 * Typically, this is set after parsing the URL.
	 *
	 * @since 4.4.0
	 *
	 * @param array $params Parameter map of key to value.
	 */
	public function set_url_params( $params ) {
		$this->params['URL'] = $params;
	}

	/**
	 * Retrieves parameters from the query string.
	 *
	 * These are the parameters you'd typically find in `$_GET`.
	 *
	 * @since 4.4.0
	 *
	 * @return array Parameter map of key to value
	 */
	public function get_query_params() {
		return $this->params['GET'];
	}

	/**
	 * Sets parameters from the query string.
	 *
	 * Typically, this is set from `$_GET`.
	 *
	 * @since 4.4.0
	 *
	 * @param array $params Parameter map of key to value.
	 */
	public function set_query_params( $params ) {
		$this->params['GET'] = $params;
	}

	/**
	 * Retrieves parameters from the body.
	 *
	 * These are the parameters you'd typically find in `$_POST`.
	 *
	 * @since 4.4.0
	 *
	 * @return array Parameter map of key to value.
	 */
	public function get_body_params() {
		return $this->params['POST'];
	}

	/**
	 * Sets parameters from the body.
	 *
	 * Typically, this is set from `$_POST`.
	 *
	 * @since 4.4.0
	 *
	 * @param array $params Parameter map of key to value.
	 */
	public function set_body_params( $params ) {
		$this->params['POST'] = $params;
	}

	/**
	 * Retrieves multipart file parameters from the body.
	 *
	 * These are the parameters you'd typically find in `$_FILES`.
	 *
	 * @since 4.4.0
	 *
	 * @return array Parameter map of key to value
	 */
	public function get_file_params() {
		return $this->params['FILES'];
	}

	/**
	 * Sets multipart file parameters from the body.
	 *
	 * Typically, this is set from `$_FILES`.
	 *
	 * @since 4.4.0
	 *
	 * @param array $params Parameter map of key to value.
	 */
	public function set_file_params( $params ) {
		$this->params['FILES'] = $params;
	}

	/**
	 * Retrieves the default parameters.
	 *
	 * These are the parameters set in the route registration.
	 *
	 * @since 4.4.0
	 *
	 * @return array Parameter map of key to value
	 */
	public function get_default_params() {
		return $this->params['defaults'];
	}

	/**
	 * Sets default parameters.
	 *
	 * These are the parameters set in the route registration.
	 *
	 * @since 4.4.0
	 *
	 * @param array $params Parameter map of key to value.
	 */
	public function set_default_params( $params ) {
		$this->params['defaults'] = $params;
	}

	/**
	 * Retrieves the request body content.
	 *
	 * @since 4.4.0
	 *
	 * @return string Binary data from the request body.
	 */
	public function get_body() {
		return $this->body;
	}

	/**
	 * Sets body content.
	 *
	 * @since 4.4.0
	 *
	 * @param string $data Binary data from the request body.
	 */
	public function set_body( $data ) {
		$this->body = $data;

		// Enable lazy parsing.
		$this->parsed_json    = false;
		$this->parsed_body    = false;
		$this->params['JSON'] = null;
	}

	/**
	 * Retrieves the parameters from a JSON-formatted body.
	 *
	 * @since 4.4.0
	 *
	 * @return array Parameter map of key to value.
	 */
	public function get_json_params() {
		// Ensure the parameters have been parsed out.
		$this->parse_json_params();

		return $this->params['JSON'];
	}

	/**
	 * Parses the JSON parameters.
	 *
	 * Avoids parsing the JSON data until we need to access it.
	 *
	 * @since 4.4.0
	 * @since 4.7.0 Returns error instance if value cannot be decoded.
	 * @return true|WP_Error True if the JSON data was passed or no JSON data was provided, WP_Error if invalid JSON was passed.
	 */
	protected function parse_json_params() {
		if ( $this->parsed_json ) {
			return true;
		}

		$this->parsed_json = true;

		// Check that we actually got JSON.
		$content_type = $this->get_content_type();

		if ( empty( $content_type ) || 'application/json' !== $content_type['value'] ) {
			return true;
		}

		$body = $this->get_body();
		if ( empty( $body ) ) {
			return true;
		}

		$params = json_decode( $body, true );

		/*
		 * Check for a parsing error.
		 */
		if ( null === $params && JSON_ERROR_NONE !== json_last_error() ) {
			// Ensure subsequent calls receive error instance.
			$this->parsed_json = false;

			$error_data = array(
				'status'             => WP_Http::BAD_REQUEST,
				'json_error_code'    => json_last_error(),
				'json_error_message' => json_last_error_msg(),
			);

			return new WP_Error( 'rest_invalid_json', __( 'Invalid JSON body passed.' ), $error_data );
		}

		$this->params['JSON'] = $params;

		return true;
	}

	/**
	 * Parses the request body parameters.
	 *
	 * Parses out URL-encoded bodies for request methods that aren't supported
	 * natively by PHP. In PHP 5.x, only POST has these parsed automatically.
	 *
	 * @since 4.4.0
	 */
	protected function parse_body_params() {
		if ( $this->parsed_body ) {
			return;
		}

		$this->parsed_body = true;

		/*
		 * Check that we got URL-encoded. Treat a missing content-type as
		 * URL-encoded for maximum compatibility.
		 */
		$content_type = $this->get_content_type();

		if ( ! empty( $content_type ) && 'application/x-www-form-urlencoded' !== $content_type['value'] ) {
			return;
		}

		parse_str( $this->get_body(), $params );

		/*
		 * Add to the POST parameters stored internally. If a user has already
		 * set these manually (via `set_body_params`), don't override them.
		 */
		$this->params['POST'] = array_merge( $params, $this->params['POST'] );
	}

	/**
	 * Retrieves the route that matched the request.
	 *
	 * @since 4.4.0
	 *
	 * @return string Route matching regex.
	 */
	public function get_route() {
		return $this->route;
	}

	/**
	 * Sets the route that matched the request.
	 *
	 * @since 4.4.0
	 *
	 * @param string $route Route matching regex.
	 */
	public function set_route( $route ) {
		$this->route = $route;
	}

	/**
	 * Retrieves the attributes for the request.
	 *
	 * These are the options for the route that was matched.
	 *
	 * @since 4.4.0
	 *
	 * @return array Attributes for the request.
	 */
	public function get_attributes() {
		return $this->attributes;
	}

	/**
	 * Sets the attributes for the request.
	 *
	 * @since 4.4.0
	 *
	 * @param array $attributes Attributes for the request.
	 */
	public function set_attributes( $attributes ) {
		$this->attributes = $attributes;
	}

	/**
	 * Sanitizes (where possible) the params on the request.
	 *
	 * This is primarily based off the sanitize_callback param on each registered
	 * argument.
	 *
	 * @since 4.4.0
	 *
	 * @return true|WP_Error True if parameters were sanitized, WP_Error if an error occurred during sanitization.
	 */
	public function sanitize_params() {
		$attributes = $this->get_attributes();

		// No arguments set, skip sanitizing.
		if ( empty( $attributes['args'] ) ) {
			return true;
		}

		$order = $this->get_parameter_order();

		$invalid_params = array();

		foreach ( $order as $type ) {
			if ( empty( $this->params[ $type ] ) ) {
				continue;
			}

			foreach ( $this->params[ $type ] as $key => $value ) {
				if ( ! isset( $attributes['args'][ $key ] ) ) {
					continue;
				}

				$param_args = $attributes['args'][ $key ];

				// If the arg has a type but no sanitize_callback attribute, default to rest_parse_request_arg.
				if ( ! array_key_exists( 'sanitize_callback', $param_args ) && ! empty( $param_args['type'] ) ) {
					$param_args['sanitize_callback'] = 'rest_parse_request_arg';
				}
				// If there's still no sanitize_callback, nothing to do here.
				if ( empty( $param_args['sanitize_callback'] ) ) {
					continue;
				}

				$sanitized_value = call_user_func( $param_args['sanitize_callback'], $value, $this, $key );

				if ( is_wp_error( $sanitized_value ) ) {
					$invalid_params[ $key ] = $sanitized_value->get_error_message();
				} else {
					$this->params[ $type ][ $key ] = $sanitized_value;
				}
			}
		}

		if ( $invalid_params ) {
			return new WP_Error(
				'rest_invalid_param',
				/* translators: %s: List of invalid parameters. */
				sprintf( __( 'Invalid parameter(s): %s' ), implode( ', ', array_keys( $invalid_params ) ) ),
				array(
					'status' => 400,
					'params' => $invalid_params,
				)
			);
		}

		return true;
	}

	/**
	 * Checks whether this request is valid according to its attributes.
	 *
	 * @since 4.4.0
	 *
	 * @return bool|WP_Error True if there are no parameters to validate or if all pass validation,
	 *                       WP_Error if required parameters are missing.
	 */
	public function has_valid_params() {
		// If JSON data was passed, check for errors.
		$json_error = $this->parse_json_params();
		if ( is_wp_error( $json_error ) ) {
			return $json_error;
		}

		$attributes = $this->get_attributes();
		$required   = array();

		// No arguments set, skip validation.
		if ( empty( $attributes['args'] ) ) {
			return true;
		}

		foreach ( $attributes['args'] as $key => $arg ) {

			$param = $this->get_param( $key );
			if ( isset( $arg['required'] ) && true === $arg['required'] && null === $param ) {
				$required[] = $key;
			}
		}

		if ( ! empty( $required ) ) {
			return new WP_Error(
				'rest_missing_callback_param',
				/* translators: %s: List of required parameters. */
				sprintf( __( 'Missing parameter(s): %s' ), implode( ', ', $required ) ),
				array(
					'status' => 400,
					'params' => $required,
				)
			);
		}

		/*
		 * Check the validation callbacks for each registered arg.
		 *
		 * This is done after required checking as required checking is cheaper.
		 */
		$invalid_params = array();

		foreach ( $attributes['args'] as $key => $arg ) {

			$param = $this->get_param( $key );

			if ( null !== $param && ! empty( $arg['validate_callback'] ) ) {
				$valid_check = call_user_func( $arg['validate_callback'], $param, $this, $key );

				if ( false === $valid_check ) {
					$invalid_params[ $key ] = __( 'Invalid parameter.' );
				}

				if ( is_wp_error( $valid_check ) ) {
					$invalid_params[ $key ] = $valid_check->get_error_message();
				}
			}
		}

		if ( $invalid_params ) {
			return new WP_Error(
				'rest_invalid_param',
				/* translators: %s: List of invalid parameters. */
				sprintf( __( 'Invalid parameter(s): %s' ), implode( ', ', array_keys( $invalid_params ) ) ),
				array(
					'status' => 400,
					'params' => $invalid_params,
				)
			);
		}

		return true;

	}

	/**
	 * Checks if a parameter is set.
	 *
	 * @since 4.4.0
	 *
	 * @param string $offset Parameter name.
	 * @return bool Whether the parameter is set.
	 */
	public function offsetExists( $offset ) {
		$order = $this->get_parameter_order();

		foreach ( $order as $type ) {
			if ( isset( $this->params[ $type ][ $offset ] ) ) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Retrieves a parameter from the request.
	 *
	 * @since 4.4.0
	 *
	 * @param string $offset Parameter name.
	 * @return mixed|null Value if set, null otherwise.
	 */
	public function offsetGet( $offset ) {
		return $this->get_param( $offset );
	}

	/**
	 * Sets a parameter on the request.
	 *
	 * @since 4.4.0
	 *
	 * @param string $offset Parameter name.
	 * @param mixed  $value  Parameter value.
	 */
	public function offsetSet( $offset, $value ) {
		$this->set_param( $offset, $value );
	}

	/**
	 * Removes a parameter from the request.
	 *
	 * @since 4.4.0
	 *
	 * @param string $offset Parameter name.
	 */
	public function offsetUnset( $offset ) {
		$order = $this->get_parameter_order();

		// Remove the offset from every group.
		foreach ( $order as $type ) {
			unset( $this->params[ $type ][ $offset ] );
		}
	}

	/**
	 * Retrieves a WP_REST_Request object from a full URL.
	 *
	 * @since 4.5.0
	 *
	 * @param string $url URL with protocol, domain, path and query args.
	 * @return WP_REST_Request|false WP_REST_Request object on success, false on failure.
	 */
	public static function from_url( $url ) {
		$bits         = parse_url( $url );
		$query_params = array();

		if ( ! empty( $bits['query'] ) ) {
			wp_parse_str( $bits['query'], $query_params );
		}

		$api_root = rest_url();
		if ( get_option( 'permalink_structure' ) && 0 === strpos( $url, $api_root ) ) {
			// Pretty permalinks on, and URL is under the API root.
			$api_url_part = substr( $url, strlen( untrailingslashit( $api_root ) ) );
			$route        = parse_url( $api_url_part, PHP_URL_PATH );
		} elseif ( ! empty( $query_params['rest_route'] ) ) {
			// ?rest_route=... set directly.
			$route = $query_params['rest_route'];
			unset( $query_params['rest_route'] );
		}

		$request = false;
		if ( ! empty( $route ) ) {
			$request = new WP_REST_Request( 'GET', $route );
			$request->set_query_params( $query_params );
		}

		/**
		 * Filters the request generated from a URL.
		 *
		 * @since 4.5.0
		 *
		 * @param WP_REST_Request|false $request Generated request object, or false if URL
		 *                                       could not be parsed.
		 * @param string                $url     URL the request was generated from.
		 */
		return apply_filters( 'rest_request_from_url', $request, $url );
	}
}


<?php
/**
 * REST API: WP_REST_Response class
 *
 * @package WordPress
 * @subpackage REST_API
 * @since 4.4.0
 */

/**
 * Core class used to implement a REST response object.
 *
 * @since 4.4.0
 *
 * @see WP_HTTP_Response
 */
class WP_REST_Response extends WP_HTTP_Response {

	/**
	 * Links related to the response.
	 *
	 * @since 4.4.0
	 * @var array
	 */
	protected $links = array();

	/**
	 * The route that was to create the response.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	protected $matched_route = '';

	/**
	 * The handler that was used to create the response.
	 *
	 * @since 4.4.0
	 * @var null|array
	 */
	protected $matched_handler = null;

	/**
	 * Adds a link to the response.
	 *
	 * @internal The $rel parameter is first, as this looks nicer when sending multiple.
	 *
	 * @since 4.4.0
	 *
	 * @link https://tools.ietf.org/html/rfc5988
	 * @link https://www.iana.org/assignments/link-relations/link-relations.xml
	 *
	 * @param string $rel        Link relation. Either an IANA registered type,
	 *                           or an absolute URL.
	 * @param string $href       Target URI for the link.
	 * @param array  $attributes Optional. Link parameters to send along with the URL. Default empty array.
	 */
	public function add_link( $rel, $href, $attributes = array() ) {
		if ( empty( $this->links[ $rel ] ) ) {
			$this->links[ $rel ] = array();
		}

		if ( isset( $attributes['href'] ) ) {
			// Remove the href attribute, as it's used for the main URL.
			unset( $attributes['href'] );
		}

		$this->links[ $rel ][] = array(
			'href'       => $href,
			'attributes' => $attributes,
		);
	}

	/**
	 * Removes a link from the response.
	 *
	 * @since 4.4.0
	 *
	 * @param string $rel  Link relation. Either an IANA registered type, or an absolute URL.
	 * @param string $href Optional. Only remove links for the relation matching the given href.
	 *                     Default null.
	 */
	public function remove_link( $rel, $href = null ) {
		if ( ! isset( $this->links[ $rel ] ) ) {
			return;
		}

		if ( $href ) {
			$this->links[ $rel ] = wp_list_filter( $this->links[ $rel ], array( 'href' => $href ), 'NOT' );
		} else {
			$this->links[ $rel ] = array();
		}

		if ( ! $this->links[ $rel ] ) {
			unset( $this->links[ $rel ] );
		}
	}

	/**
	 * Adds multiple links to the response.
	 *
	 * Link data should be an associative array with link relation as the key.
	 * The value can either be an associative array of link attributes
	 * (including `href` with the URL for the response), or a list of these
	 * associative arrays.
	 *
	 * @since 4.4.0
	 *
	 * @param array $links Map of link relation to list of links.
	 */
	public function add_links( $links ) {
		foreach ( $links as $rel => $set ) {
			// If it's a single link, wrap with an array for consistent handling.
			if ( isset( $set['href'] ) ) {
				$set = array( $set );
			}

			foreach ( $set as $attributes ) {
				$this->add_link( $rel, $attributes['href'], $attributes );
			}
		}
	}

	/**
	 * Retrieves links for the response.
	 *
	 * @since 4.4.0
	 *
	 * @return array List of links.
	 */
	public function get_links() {
		return $this->links;
	}

	/**
	 * Sets a single link header.
	 *
	 * @internal The $rel parameter is first, as this looks nicer when sending multiple.
	 *
	 * @since 4.4.0
	 *
	 * @link https://tools.ietf.org/html/rfc5988
	 * @link https://www.iana.org/assignments/link-relations/link-relations.xml
	 *
	 * @param string $rel   Link relation. Either an IANA registered type, or an absolute URL.
	 * @param string $link  Target IRI for the link.
	 * @param array  $other Optional. Other parameters to send, as an assocative array.
	 *                      Default empty array.
	 */
	public function link_header( $rel, $link, $other = array() ) {
		$header = '<' . $link . '>; rel="' . $rel . '"';

		foreach ( $other as $key => $value ) {
			if ( 'title' === $key ) {
				$value = '"' . $value . '"';
			}

			$header .= '; ' . $key . '=' . $value;
		}
		$this->header( 'Link', $header, false );
	}

	/**
	 * Retrieves the route that was used.
	 *
	 * @since 4.4.0
	 *
	 * @return string The matched route.
	 */
	public function get_matched_route() {
		return $this->matched_route;
	}

	/**
	 * Sets the route (regex for path) that caused the response.
	 *
	 * @since 4.4.0
	 *
	 * @param string $route Route name.
	 */
	public function set_matched_route( $route ) {
		$this->matched_route = $route;
	}

	/**
	 * Retrieves the handler that was used to generate the response.
	 *
	 * @since 4.4.0
	 *
	 * @return null|array The handler that was used to create the response.
	 */
	public function get_matched_handler() {
		return $this->matched_handler;
	}

	/**
	 * Sets the handler that was responsible for generating the response.
	 *
	 * @since 4.4.0
	 *
	 * @param array $handler The matched handler.
	 */
	public function set_matched_handler( $handler ) {
		$this->matched_handler = $handler;
	}

	/**
	 * Checks if the response is an error, i.e. >= 400 response code.
	 *
	 * @since 4.4.0
	 *
	 * @return bool Whether the response is an error.
	 */
	public function is_error() {
		return $this->get_status() >= 400;
	}

	/**
	 * Retrieves a WP_Error object from the response.
	 *
	 * @since 4.4.0
	 *
	 * @return WP_Error|null WP_Error or null on not an errored response.
	 */
	public function as_error() {
		if ( ! $this->is_error() ) {
			return null;
		}

		$error = new WP_Error;

		if ( is_array( $this->get_data() ) ) {
			$data = $this->get_data();
			$error->add( $data['code'], $data['message'], $data['data'] );

			if ( ! empty( $data['additional_errors'] ) ) {
				foreach ( $data['additional_errors'] as $err ) {
					$error->add( $err['code'], $err['message'], $err['data'] );
				}
			}
		} else {
			$error->add( $this->get_status(), '', array( 'status' => $this->get_status() ) );
		}

		return $error;
	}

	/**
	 * Retrieves the CURIEs (compact URIs) used for relations.
	 *
	 * @since 4.5.0
	 *
	 * @return array Compact URIs.
	 */
	public function get_curies() {
		$curies = array(
			array(
				'name'      => 'wp',
				'href'      => 'https://api.w.org/{rel}',
				'templated' => true,
			),
		);

		/**
		 * Filters extra CURIEs available on API responses.
		 *
		 * CURIEs allow a shortened version of URI relations. This allows a more
		 * usable form for custom relations than using the full URI. These work
		 * similarly to how XML namespaces work.
		 *
		 * Registered CURIES need to specify a name and URI template. This will
		 * automatically transform URI relations into their shortened version.
		 * The shortened relation follows the format `{name}:{rel}`. `{rel}` in
		 * the URI template will be replaced with the `{rel}` part of the
		 * shortened relation.
		 *
		 * For example, a CURIE with name `example` and URI template
		 * `http://w.org/{rel}` would transform a `http://w.org/term` relation
		 * into `example:term`.
		 *
		 * Well-behaved clients should expand and normalise these back to their
		 * full URI relation, however some naive clients may not resolve these
		 * correctly, so adding new CURIEs may break backward compatibility.
		 *
		 * @since 4.5.0
		 *
		 * @param array $additional Additional CURIEs to register with the API.
		 */
		$additional = apply_filters( 'rest_response_link_curies', array() );

		return array_merge( $curies, $additional );
	}
}


<?php
/**
 * REST API: WP_REST_Server class
 *
 * @package WordPress
 * @subpackage REST_API
 * @since 4.4.0
 */

/**
 * Core class used to implement the WordPress REST API server.
 *
 * @since 4.4.0
 */
class WP_REST_Server {

	/**
	 * Alias for GET transport method.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	const READABLE = 'GET';

	/**
	 * Alias for POST transport method.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	const CREATABLE = 'POST';

	/**
	 * Alias for POST, PUT, PATCH transport methods together.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	const EDITABLE = 'POST, PUT, PATCH';

	/**
	 * Alias for DELETE transport method.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	const DELETABLE = 'DELETE';

	/**
	 * Alias for GET, POST, PUT, PATCH & DELETE transport methods together.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	const ALLMETHODS = 'GET, POST, PUT, PATCH, DELETE';

	/**
	 * Namespaces registered to the server.
	 *
	 * @since 4.4.0
	 * @var array
	 */
	protected $namespaces = array();

	/**
	 * Endpoints registered to the server.
	 *
	 * @since 4.4.0
	 * @var array
	 */
	protected $endpoints = array();

	/**
	 * Options defined for the routes.
	 *
	 * @since 4.4.0
	 * @var array
	 */
	protected $route_options = array();

	/**
	 * Caches embedded requests.
	 *
	 * @since 5.4.0
	 * @var array
	 */
	protected $embed_cache = array();

	/**
	 * Instantiates the REST server.
	 *
	 * @since 4.4.0
	 */
	public function __construct() {
		$this->endpoints = array(
			// Meta endpoints.
			'/' => array(
				'callback' => array( $this, 'get_index' ),
				'methods'  => 'GET',
				'args'     => array(
					'context' => array(
						'default' => 'view',
					),
				),
			),
		);
	}

	/**
	 * Checks the authentication headers if supplied.
	 *
	 * @since 4.4.0
	 *
	 * @return WP_Error|null WP_Error indicates unsuccessful login, null indicates successful
	 *                       or no authentication provided
	 */
	public function check_authentication() {
		/**
		 * Filters REST authentication errors.
		 *
		 * This is used to pass a WP_Error from an authentication method back to
		 * the API.
		 *
		 * Authentication methods should check first if they're being used, as
		 * multiple authentication methods can be enabled on a site (cookies,
		 * HTTP basic auth, OAuth). If the authentication method hooked in is
		 * not actually being attempted, null should be returned to indicate
		 * another authentication method should check instead. Similarly,
		 * callbacks should ensure the value is `null` before checking for
		 * errors.
		 *
		 * A WP_Error instance can be returned if an error occurs, and this should
		 * match the format used by API methods internally (that is, the `status`
		 * data should be used). A callback can return `true` to indicate that
		 * the authentication method was used, and it succeeded.
		 *
		 * @since 4.4.0
		 *
		 * @param WP_Error|null|true $errors WP_Error if authentication error, null if authentication
		 *                                   method wasn't used, true if authentication succeeded.
		 */
		return apply_filters( 'rest_authentication_errors', null );
	}

	/**
	 * Converts an error to a response object.
	 *
	 * This iterates over all error codes and messages to change it into a flat
	 * array. This enables simpler client behaviour, as it is represented as a
	 * list in JSON rather than an object/map.
	 *
	 * @since 4.4.0
	 *
	 * @param WP_Error $error WP_Error instance.
	 * @return WP_REST_Response List of associative arrays with code and message keys.
	 */
	protected function error_to_response( $error ) {
		$error_data = $error->get_error_data();

		if ( is_array( $error_data ) && isset( $error_data['status'] ) ) {
			$status = $error_data['status'];
		} else {
			$status = 500;
		}

		$errors = array();

		foreach ( (array) $error->errors as $code => $messages ) {
			foreach ( (array) $messages as $message ) {
				$errors[] = array(
					'code'    => $code,
					'message' => $message,
					'data'    => $error->get_error_data( $code ),
				);
			}
		}

		$data = $errors[0];
		if ( count( $errors ) > 1 ) {
			// Remove the primary error.
			array_shift( $errors );
			$data['additional_errors'] = $errors;
		}

		$response = new WP_REST_Response( $data, $status );

		return $response;
	}

	/**
	 * Retrieves an appropriate error representation in JSON.
	 *
	 * Note: This should only be used in WP_REST_Server::serve_request(), as it
	 * cannot handle WP_Error internally. All callbacks and other internal methods
	 * should instead return a WP_Error with the data set to an array that includes
	 * a 'status' key, with the value being the HTTP status to send.
	 *
	 * @since 4.4.0
	 *
	 * @param string $code    WP_Error-style code.
	 * @param string $message Human-readable message.
	 * @param int    $status  Optional. HTTP status code to send. Default null.
	 * @return string JSON representation of the error
	 */
	protected function json_error( $code, $message, $status = null ) {
		if ( $status ) {
			$this->set_status( $status );
		}

		$error = compact( 'code', 'message' );

		return wp_json_encode( $error );
	}

	/**
	 * Handles serving an API request.
	 *
	 * Matches the current server URI to a route and runs the first matching
	 * callback then outputs a JSON representation of the returned value.
	 *
	 * @since 4.4.0
	 *
	 * @see WP_REST_Server::dispatch()
	 *
	 * @param string $path Optional. The request route. If not set, `$_SERVER['PATH_INFO']` will be used.
	 *                     Default null.
	 * @return null|false Null if not served and a HEAD request, false otherwise.
	 */
	public function serve_request( $path = null ) {
		$content_type = isset( $_GET['_jsonp'] ) ? 'application/javascript' : 'application/json';
		$this->send_header( 'Content-Type', $content_type . '; charset=' . get_option( 'blog_charset' ) );
		$this->send_header( 'X-Robots-Tag', 'noindex' );

		$api_root = get_rest_url();
		if ( ! empty( $api_root ) ) {
			$this->send_header( 'Link', '<' . esc_url_raw( $api_root ) . '>; rel="https://api.w.org/"' );
		}

		/*
		 * Mitigate possible JSONP Flash attacks.
		 *
		 * https://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/
		 */
		$this->send_header( 'X-Content-Type-Options', 'nosniff' );
		$expose_headers = array( 'X-WP-Total', 'X-WP-TotalPages', 'Link' );

		/**
		 * Filters the list of response headers that are exposed to CORS requests.
		 *
		 * @since 5.5.0
		 *
		 * @param string[] $expose_headers The list of headers to expose.
		 */
		$expose_headers = apply_filters( 'rest_exposed_cors_headers', $expose_headers );

		$this->send_header( 'Access-Control-Expose-Headers', implode( ', ', $expose_headers ) );

		$allow_headers = array(
			'Authorization',
			'X-WP-Nonce',
			'Content-Disposition',
			'Content-MD5',
			'Content-Type',
		);

		/**
		 * Filters the list of request headers that are allowed for CORS requests.
		 *
		 * The allowed headers are passed to the browser to specify which
		 * headers can be passed to the REST API. By default, we allow the
		 * Content-* headers needed to upload files to the media endpoints.
		 * As well as the Authorization and Nonce headers for allowing authentication.
		 *
		 * @since 5.5.0
		 *
		 * @param string[] $allow_headers The list of headers to allow.
		 */
		$allow_headers = apply_filters( 'rest_allowed_cors_headers', $allow_headers );

		$this->send_header( 'Access-Control-Allow-Headers', implode( ', ', $allow_headers ) );

		/**
		 * Send nocache headers on authenticated requests.
		 *
		 * @since 4.4.0
		 *
		 * @param bool $rest_send_nocache_headers Whether to send no-cache headers.
		 */
		$send_no_cache_headers = apply_filters( 'rest_send_nocache_headers', is_user_logged_in() );
		if ( $send_no_cache_headers ) {
			foreach ( wp_get_nocache_headers() as $header => $header_value ) {
				if ( empty( $header_value ) ) {
					$this->remove_header( $header );
				} else {
					$this->send_header( $header, $header_value );
				}
			}
		}

		/**
		 * Filters whether the REST API is enabled.
		 *
		 * @since 4.4.0
		 * @deprecated 4.7.0 Use the {@see 'rest_authentication_errors'} filter to
		 *                   restrict access to the API.
		 *
		 * @param bool $rest_enabled Whether the REST API is enabled. Default true.
		 */
		apply_filters_deprecated(
			'rest_enabled',
			array( true ),
			'4.7.0',
			'rest_authentication_errors',
			sprintf(
				/* translators: %s: rest_authentication_errors */
				__( 'The REST API can no longer be completely disabled, the %s filter can be used to restrict access to the API, instead.' ),
				'rest_authentication_errors'
			)
		);

		/**
		 * Filters whether jsonp is enabled.
		 *
		 * @since 4.4.0
		 *
		 * @param bool $jsonp_enabled Whether jsonp is enabled. Default true.
		 */
		$jsonp_enabled = apply_filters( 'rest_jsonp_enabled', true );

		$jsonp_callback = null;

		if ( isset( $_GET['_jsonp'] ) ) {
			if ( ! $jsonp_enabled ) {
				echo $this->json_error( 'rest_callback_disabled', __( 'JSONP support is disabled on this site.' ), 400 );
				return false;
			}

			$jsonp_callback = $_GET['_jsonp'];
			if ( ! wp_check_jsonp_callback( $jsonp_callback ) ) {
				echo $this->json_error( 'rest_callback_invalid', __( 'Invalid JSONP callback function.' ), 400 );
				return false;
			}
		}

		if ( empty( $path ) ) {
			if ( isset( $_SERVER['PATH_INFO'] ) ) {
				$path = $_SERVER['PATH_INFO'];
			} else {
				$path = '/';
			}
		}

		$request = new WP_REST_Request( $_SERVER['REQUEST_METHOD'], $path );

		$request->set_query_params( wp_unslash( $_GET ) );
		$request->set_body_params( wp_unslash( $_POST ) );
		$request->set_file_params( $_FILES );
		$request->set_headers( $this->get_headers( wp_unslash( $_SERVER ) ) );
		$request->set_body( self::get_raw_data() );

		/*
		 * HTTP method override for clients that can't use PUT/PATCH/DELETE. First, we check
		 * $_GET['_method']. If that is not set, we check for the HTTP_X_HTTP_METHOD_OVERRIDE
		 * header.
		 */
		if ( isset( $_GET['_method'] ) ) {
			$request->set_method( $_GET['_method'] );
		} elseif ( isset( $_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE'] ) ) {
			$request->set_method( $_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE'] );
		}

		$result = $this->check_authentication();

		if ( ! is_wp_error( $result ) ) {
			$result = $this->dispatch( $request );
		}

		// Normalize to either WP_Error or WP_REST_Response...
		$result = rest_ensure_response( $result );

		// ...then convert WP_Error across.
		if ( is_wp_error( $result ) ) {
			$result = $this->error_to_response( $result );
		}

		/**
		 * Filters the API response.
		 *
		 * Allows modification of the response before returning.
		 *
		 * @since 4.4.0
		 * @since 4.5.0 Applied to embedded responses.
		 *
		 * @param WP_HTTP_Response $result  Result to send to the client. Usually a WP_REST_Response.
		 * @param WP_REST_Server   $this    Server instance.
		 * @param WP_REST_Request  $request Request used to generate the response.
		 */
		$result = apply_filters( 'rest_post_dispatch', rest_ensure_response( $result ), $this, $request );

		// Wrap the response in an envelope if asked for.
		if ( isset( $_GET['_envelope'] ) ) {
			$result = $this->envelope_response( $result, isset( $_GET['_embed'] ) );
		}

		// Send extra data from response objects.
		$headers = $result->get_headers();
		$this->send_headers( $headers );

		$code = $result->get_status();
		$this->set_status( $code );

		/**
		 * Filters whether the request has already been served.
		 *
		 * Allow sending the request manually - by returning true, the API result
		 * will not be sent to the client.
		 *
		 * @since 4.4.0
		 *
		 * @param bool             $served  Whether the request has already been served.
		 *                                           Default false.
		 * @param WP_HTTP_Response $result  Result to send to the client. Usually a WP_REST_Response.
		 * @param WP_REST_Request  $request Request used to generate the response.
		 * @param WP_REST_Server   $this    Server instance.
		 */
		$served = apply_filters( 'rest_pre_serve_request', false, $result, $request, $this );

		if ( ! $served ) {
			if ( 'HEAD' === $request->get_method() ) {
				return null;
			}

			// Embed links inside the request.
			$embed  = isset( $_GET['_embed'] ) ? rest_parse_embed_param( $_GET['_embed'] ) : false;
			$result = $this->response_to_data( $result, $embed );

			/**
			 * Filters the API response.
			 *
			 * Allows modification of the response data after inserting
			 * embedded data (if any) and before echoing the response data.
			 *
			 * @since 4.8.1
			 *
			 * @param array            $result  Response data to send to the client.
			 * @param WP_REST_Server   $this    Server instance.
			 * @param WP_REST_Request  $request Request used to generate the response.
			 */
			$result = apply_filters( 'rest_pre_echo_response', $result, $this, $request );

			// The 204 response shouldn't have a body.
			if ( 204 === $code || null === $result ) {
				return null;
			}

			$result = wp_json_encode( $result );

			$json_error_message = $this->get_json_last_error();

			if ( $json_error_message ) {
				$json_error_obj = new WP_Error(
					'rest_encode_error',
					$json_error_message,
					array( 'status' => 500 )
				);

				$result = $this->error_to_response( $json_error_obj );
				$result = wp_json_encode( $result->data[0] );
			}

			if ( $jsonp_callback ) {
				// Prepend '/**/' to mitigate possible JSONP Flash attacks.
				// https://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/
				echo '/**/' . $jsonp_callback . '(' . $result . ')';
			} else {
				echo $result;
			}
		}

		return null;
	}

	/**
	 * Converts a response to data to send.
	 *
	 * @since 4.4.0
	 * @since 5.4.0 The $embed parameter can now contain a list of link relations to include.
	 *
	 * @param WP_REST_Response $response Response object.
	 * @param bool|string[]    $embed    Whether to embed all links, a filtered list of link relations, or no links.
	 * @return array {
	 *     Data with sub-requests embedded.
	 *
	 *     @type array $_links    Links.
	 *     @type array $_embedded Embeddeds.
	 * }
	 */
	public function response_to_data( $response, $embed ) {
		$data  = $response->get_data();
		$links = self::get_compact_response_links( $response );

		if ( ! empty( $links ) ) {
			// Convert links to part of the data.
			$data['_links'] = $links;
		}

		if ( $embed ) {
			$this->embed_cache = array();
			// Determine if this is a numeric array.
			if ( wp_is_numeric_array( $data ) ) {
				foreach ( $data as $key => $item ) {
					$data[ $key ] = $this->embed_links( $item, $embed );
				}
			} else {
				$data = $this->embed_links( $data, $embed );
			}
			$this->embed_cache = array();
		}

		return $data;
	}

	/**
	 * Retrieves links from a response.
	 *
	 * Extracts the links from a response into a structured hash, suitable for
	 * direct output.
	 *
	 * @since 4.4.0
	 *
	 * @param WP_REST_Response $response Response to extract links from.
	 * @return array Map of link relation to list of link hashes.
	 */
	public static function get_response_links( $response ) {
		$links = $response->get_links();

		if ( empty( $links ) ) {
			return array();
		}

		// Convert links to part of the data.
		$data = array();
		foreach ( $links as $rel => $items ) {
			$data[ $rel ] = array();

			foreach ( $items as $item ) {
				$attributes         = $item['attributes'];
				$attributes['href'] = $item['href'];
				$data[ $rel ][]     = $attributes;
			}
		}

		return $data;
	}

	/**
	 * Retrieves the CURIEs (compact URIs) used for relations.
	 *
	 * Extracts the links from a response into a structured hash, suitable for
	 * direct output.
	 *
	 * @since 4.5.0
	 *
	 * @param WP_REST_Response $response Response to extract links from.
	 * @return array Map of link relation to list of link hashes.
	 */
	public static function get_compact_response_links( $response ) {
		$links = self::get_response_links( $response );

		if ( empty( $links ) ) {
			return array();
		}

		$curies      = $response->get_curies();
		$used_curies = array();

		foreach ( $links as $rel => $items ) {

			// Convert $rel URIs to their compact versions if they exist.
			foreach ( $curies as $curie ) {
				$href_prefix = substr( $curie['href'], 0, strpos( $curie['href'], '{rel}' ) );
				if ( strpos( $rel, $href_prefix ) !== 0 ) {
					continue;
				}

				// Relation now changes from '$uri' to '$curie:$relation'.
				$rel_regex = str_replace( '\{rel\}', '(.+)', preg_quote( $curie['href'], '!' ) );
				preg_match( '!' . $rel_regex . '!', $rel, $matches );
				if ( $matches ) {
					$new_rel                       = $curie['name'] . ':' . $matches[1];
					$used_curies[ $curie['name'] ] = $curie;
					$links[ $new_rel ]             = $items;
					unset( $links[ $rel ] );
					break;
				}
			}
		}

		// Push the curies onto the start of the links array.
		if ( $used_curies ) {
			$links['curies'] = array_values( $used_curies );
		}

		return $links;
	}

	/**
	 * Embeds the links from the data into the request.
	 *
	 * @since 4.4.0
	 * @since 5.4.0 The $embed parameter can now contain a list of link relations to include.
	 *
	 * @param array         $data  Data from the request.
	 * @param bool|string[] $embed Whether to embed all links or a filtered list of link relations.
	 * @return array {
	 *     Data with sub-requests embedded.
	 *
	 *     @type array $_links    Links.
	 *     @type array $_embedded Embeddeds.
	 * }
	 */
	protected function embed_links( $data, $embed = true ) {
		if ( empty( $data['_links'] ) ) {
			return $data;
		}

		$embedded = array();

		foreach ( $data['_links'] as $rel => $links ) {
			// If a list of relations was specified, and the link relation
			// is not in the list of allowed relations, don't process the link.
			if ( is_array( $embed ) && ! in_array( $rel, $embed, true ) ) {
				continue;
			}

			$embeds = array();

			foreach ( $links as $item ) {
				// Determine if the link is embeddable.
				if ( empty( $item['embeddable'] ) ) {
					// Ensure we keep the same order.
					$embeds[] = array();
					continue;
				}

				if ( ! array_key_exists( $item['href'], $this->embed_cache ) ) {
					// Run through our internal routing and serve.
					$request = WP_REST_Request::from_url( $item['href'] );
					if ( ! $request ) {
						$embeds[] = array();
						continue;
					}

					// Embedded resources get passed context=embed.
					if ( empty( $request['context'] ) ) {
						$request['context'] = 'embed';
					}

					$response = $this->dispatch( $request );

					/** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */
					$response = apply_filters( 'rest_post_dispatch', rest_ensure_response( $response ), $this, $request );

					$this->embed_cache[ $item['href'] ] = $this->response_to_data( $response, false );
				}

				$embeds[] = $this->embed_cache[ $item['href'] ];
			}

			// Determine if any real links were found.
			$has_links = count( array_filter( $embeds ) );

			if ( $has_links ) {
				$embedded[ $rel ] = $embeds;
			}
		}

		if ( ! empty( $embedded ) ) {
			$data['_embedded'] = $embedded;
		}

		return $data;
	}

	/**
	 * Wraps the response in an envelope.
	 *
	 * The enveloping technique is used to work around browser/client
	 * compatibility issues. Essentially, it converts the full HTTP response to
	 * data instead.
	 *
	 * @since 4.4.0
	 *
	 * @param WP_REST_Response $response Response object.
	 * @param bool             $embed    Whether links should be embedded.
	 * @return WP_REST_Response New response with wrapped data
	 */
	public function envelope_response( $response, $embed ) {
		$envelope = array(
			'body'    => $this->response_to_data( $response, $embed ),
			'status'  => $response->get_status(),
			'headers' => $response->get_headers(),
		);

		/**
		 * Filters the enveloped form of a response.
		 *
		 * @since 4.4.0
		 *
		 * @param array            $envelope Envelope data.
		 * @param WP_REST_Response $response Original response data.
		 */
		$envelope = apply_filters( 'rest_envelope_response', $envelope, $response );

		// Ensure it's still a response and return.
		return rest_ensure_response( $envelope );
	}

	/**
	 * Registers a route to the server.
	 *
	 * @since 4.4.0
	 *
	 * @param string $namespace  Namespace.
	 * @param string $route      The REST route.
	 * @param array  $route_args Route arguments.
	 * @param bool   $override   Optional. Whether the route should be overridden if it already exists.
	 *                           Default false.
	 */
	public function register_route( $namespace, $route, $route_args, $override = false ) {
		if ( ! isset( $this->namespaces[ $namespace ] ) ) {
			$this->namespaces[ $namespace ] = array();

			$this->register_route(
				$namespace,
				'/' . $namespace,
				array(
					array(
						'methods'  => self::READABLE,
						'callback' => array( $this, 'get_namespace_index' ),
						'args'     => array(
							'namespace' => array(
								'default' => $namespace,
							),
							'context'   => array(
								'default' => 'view',
							),
						),
					),
				)
			);
		}

		// Associative to avoid double-registration.
		$this->namespaces[ $namespace ][ $route ] = true;
		$route_args['namespace']                  = $namespace;

		if ( $override || empty( $this->endpoints[ $route ] ) ) {
			$this->endpoints[ $route ] = $route_args;
		} else {
			$this->endpoints[ $route ] = array_merge( $this->endpoints[ $route ], $route_args );
		}
	}

	/**
	 * Retrieves the route map.
	 *
	 * The route map is an associative array with path regexes as the keys. The
	 * value is an indexed array with the callback function/method as the first
	 * item, and a bitmask of HTTP methods as the second item (see the class
	 * constants).
	 *
	 * Each route can be mapped to more than one callback by using an array of
	 * the indexed arrays. This allows mapping e.g. GET requests to one callback
	 * and POST requests to another.
	 *
	 * Note that the path regexes (array keys) must have @ escaped, as this is
	 * used as the delimiter with preg_match()
	 *
	 * @since 4.4.0
	 * @since 5.4.0 Add $namespace parameter.
	 *
	 * @param string $namespace Optionally, only return routes in the given namespace.
	 * @return array `'/path/regex' => array( $callback, $bitmask )` or
	 *               `'/path/regex' => array( array( $callback, $bitmask ), ...)`.
	 */
	public function get_routes( $namespace = '' ) {
		$endpoints = $this->endpoints;

		if ( $namespace ) {
			$endpoints = wp_list_filter( $endpoints, array( 'namespace' => $namespace ) );
		}

		/**
		 * Filters the array of available endpoints.
		 *
		 * @since 4.4.0
		 *
		 * @param array $endpoints The available endpoints. An array of matching regex patterns, each mapped
		 *                         to an array of callbacks for the endpoint. These take the format
		 *                         `'/path/regex' => array( $callback, $bitmask )` or
		 *                         `'/path/regex' => array( array( $callback, $bitmask ).
		 */
		$endpoints = apply_filters( 'rest_endpoints', $endpoints );

		// Normalise the endpoints.
		$defaults = array(
			'methods'       => '',
			'accept_json'   => false,
			'accept_raw'    => false,
			'show_in_index' => true,
			'args'          => array(),
		);

		foreach ( $endpoints as $route => &$handlers ) {

			if ( isset( $handlers['callback'] ) ) {
				// Single endpoint, add one deeper.
				$handlers = array( $handlers );
			}

			if ( ! isset( $this->route_options[ $route ] ) ) {
				$this->route_options[ $route ] = array();
			}

			foreach ( $handlers as $key => &$handler ) {

				if ( ! is_numeric( $key ) ) {
					// Route option, move it to the options.
					$this->route_options[ $route ][ $key ] = $handler;
					unset( $handlers[ $key ] );
					continue;
				}

				$handler = wp_parse_args( $handler, $defaults );

				// Allow comma-separated HTTP methods.
				if ( is_string( $handler['methods'] ) ) {
					$methods = explode( ',', $handler['methods'] );
				} elseif ( is_array( $handler['methods'] ) ) {
					$methods = $handler['methods'];
				} else {
					$methods = array();
				}

				$handler['methods'] = array();

				foreach ( $methods as $method ) {
					$method                        = strtoupper( trim( $method ) );
					$handler['methods'][ $method ] = true;
				}
			}
		}

		return $endpoints;
	}

	/**
	 * Retrieves namespaces registered on the server.
	 *
	 * @since 4.4.0
	 *
	 * @return string[] List of registered namespaces.
	 */
	public function get_namespaces() {
		return array_keys( $this->namespaces );
	}

	/**
	 * Retrieves specified options for a route.
	 *
	 * @since 4.4.0
	 *
	 * @param string $route Route pattern to fetch options for.
	 * @return array|null Data as an associative array if found, or null if not found.
	 */
	public function get_route_options( $route ) {
		if ( ! isset( $this->route_options[ $route ] ) ) {
			return null;
		}

		return $this->route_options[ $route ];
	}

	/**
	 * Matches the request to a callback and call it.
	 *
	 * @since 4.4.0
	 *
	 * @param WP_REST_Request $request Request to attempt dispatching.
	 * @return WP_REST_Response Response returned by the callback.
	 */
	public function dispatch( $request ) {
		/**
		 * Filters the pre-calculated result of a REST dispatch request.
		 *
		 * Allow hijacking the request before dispatching by returning a non-empty. The returned value
		 * will be used to serve the request instead.
		 *
		 * @since 4.4.0
		 *
		 * @param mixed           $result  Response to replace the requested version with. Can be anything
		 *                                 a normal endpoint can return, or null to not hijack the request.
		 * @param WP_REST_Server  $this    Server instance.
		 * @param WP_REST_Request $request Request used to generate the response.
		 */
		$result = apply_filters( 'rest_pre_dispatch', null, $this, $request );

		if ( ! empty( $result ) ) {
			return $result;
		}

		$method = $request->get_method();
		$path   = $request->get_route();

		$with_namespace = array();

		foreach ( $this->get_namespaces() as $namespace ) {
			if ( 0 === strpos( trailingslashit( ltrim( $path, '/' ) ), $namespace ) ) {
				$with_namespace[] = $this->get_routes( $namespace );
			}
		}

		if ( $with_namespace ) {
			$routes = array_merge( ...$with_namespace );
		} else {
			$routes = $this->get_routes();
		}

		foreach ( $routes as $route => $handlers ) {
			$match = preg_match( '@^' . $route . '$@i', $path, $matches );

			if ( ! $match ) {
				continue;
			}

			$args = array();

			foreach ( $matches as $param => $value ) {
				if ( ! is_int( $param ) ) {
					$args[ $param ] = $value;
				}
			}

			foreach ( $handlers as $handler ) {
				$callback = $handler['callback'];
				$response = null;

				// Fallback to GET method if no HEAD method is registered.
				$checked_method = $method;
				if ( 'HEAD' === $method && empty( $handler['methods']['HEAD'] ) ) {
					$checked_method = 'GET';
				}
				if ( empty( $handler['methods'][ $checked_method ] ) ) {
					continue;
				}

				if ( ! is_callable( $callback ) ) {
					$response = new WP_Error(
						'rest_invalid_handler',
						__( 'The handler for the route is invalid' ),
						array( 'status' => 500 )
					);
				}

				if ( ! is_wp_error( $response ) ) {
					// Remove the redundant preg_match argument.
					unset( $args[0] );

					$request->set_url_params( $args );
					$request->set_attributes( $handler );

					$defaults = array();

					foreach ( $handler['args'] as $arg => $options ) {
						if ( isset( $options['default'] ) ) {
							$defaults[ $arg ] = $options['default'];
						}
					}

					$request->set_default_params( $defaults );

					$check_required = $request->has_valid_params();
					if ( is_wp_error( $check_required ) ) {
						$response = $check_required;
					} else {
						$check_sanitized = $request->sanitize_params();
						if ( is_wp_error( $check_sanitized ) ) {
							$response = $check_sanitized;
						}
					}
				}

				/**
				 * Filters the response before executing any REST API callbacks.
				 *
				 * Allows plugins to perform additional validation after a
				 * request is initialized and matched to a registered route,
				 * but before it is executed.
				 *
				 * Note that this filter will not be called for requests that
				 * fail to authenticate or match to a registered route.
				 *
				 * @since 4.7.0
				 *
				 * @param WP_REST_Response|WP_HTTP_Response|WP_Error|mixed $response Result to send to the client. Usually a WP_REST_Response or WP_Error.
				 * @param array                                            $handler  Route handler used for the request.
				 * @param WP_REST_Request                                  $request  Request used to generate the response.
				 */
				$response = apply_filters( 'rest_request_before_callbacks', $response, $handler, $request );

				if ( ! is_wp_error( $response ) ) {
					// Check permission specified on the route.
					if ( ! empty( $handler['permission_callback'] ) ) {
						$permission = call_user_func( $handler['permission_callback'], $request );

						if ( is_wp_error( $permission ) ) {
							$response = $permission;
						} elseif ( false === $permission || null === $permission ) {
							$response = new WP_Error(
								'rest_forbidden',
								__( 'Sorry, you are not allowed to do that.' ),
								array( 'status' => rest_authorization_required_code() )
							);
						}
					}
				}

				if ( ! is_wp_error( $response ) ) {
					/**
					 * Filters the REST dispatch request result.
					 *
					 * Allow plugins to override dispatching the request.
					 *
					 * @since 4.4.0
					 * @since 4.5.0 Added `$route` and `$handler` parameters.
					 *
					 * @param mixed           $dispatch_result Dispatch result, will be used if not empty.
					 * @param WP_REST_Request $request         Request used to generate the response.
					 * @param string          $route           Route matched for the request.
					 * @param array           $handler         Route handler used for the request.
					 */
					$dispatch_result = apply_filters( 'rest_dispatch_request', null, $request, $route, $handler );

					// Allow plugins to halt the request via this filter.
					if ( null !== $dispatch_result ) {
						$response = $dispatch_result;
					} else {
						$response = call_user_func( $callback, $request );
					}
				}

				/**
				 * Filters the response immediately after executing any REST API
				 * callbacks.
				 *
				 * Allows plugins to perform any needed cleanup, for example,
				 * to undo changes made during the {@see 'rest_request_before_callbacks'}
				 * filter.
				 *
				 * Note that this filter will not be called for requests that
				 * fail to authenticate or match to a registered route.
				 *
				 * Note that an endpoint's `permission_callback` can still be
				 * called after this filter - see `rest_send_allow_header()`.
				 *
				 * @since 4.7.0
				 *
				 * @param WP_REST_Response|WP_HTTP_Response|WP_Error|mixed $response Result to send to the client. Usually a WP_REST_Response or WP_Error.
				 * @param array                                            $handler  Route handler used for the request.
				 * @param WP_REST_Request                                  $request  Request used to generate the response.
				 */
				$response = apply_filters( 'rest_request_after_callbacks', $response, $handler, $request );

				if ( is_wp_error( $response ) ) {
					$response = $this->error_to_response( $response );
				} else {
					$response = rest_ensure_response( $response );
				}

				$response->set_matched_route( $route );
				$response->set_matched_handler( $handler );

				return $response;
			}
		}

		return $this->error_to_response(
			new WP_Error(
				'rest_no_route',
				__( 'No route was found matching the URL and request method' ),
				array( 'status' => 404 )
			)
		);
	}

	/**
	 * Returns if an error occurred during most recent JSON encode/decode.
	 *
	 * Strings to be translated will be in format like
	 * "Encoding error: Maximum stack depth exceeded".
	 *
	 * @since 4.4.0
	 *
	 * @return bool|string Boolean false or string error message.
	 */
	protected function get_json_last_error() {
		$last_error_code = json_last_error();

		if ( JSON_ERROR_NONE === $last_error_code || empty( $last_error_code ) ) {
			return false;
		}

		return json_last_error_msg();
	}

	/**
	 * Retrieves the site index.
	 *
	 * This endpoint describes the capabilities of the site.
	 *
	 * @since 4.4.0
	 *
	 * @param array $request {
	 *     Request.
	 *
	 *     @type string $context Context.
	 * }
	 * @return WP_REST_Response The API root index data.
	 */
	public function get_index( $request ) {
		// General site data.
		$available = array(
			'name'            => get_option( 'blogname' ),
			'description'     => get_option( 'blogdescription' ),
			'url'             => get_option( 'siteurl' ),
			'home'            => home_url(),
			'gmt_offset'      => get_option( 'gmt_offset' ),
			'timezone_string' => get_option( 'timezone_string' ),
			'namespaces'      => array_keys( $this->namespaces ),
			'authentication'  => array(),
			'routes'          => $this->get_data_for_routes( $this->get_routes(), $request['context'] ),
		);

		$response = new WP_REST_Response( $available );

		$response->add_link( 'help', 'http://v2.wp-api.org/' );

		/**
		 * Filters the API root index data.
		 *
		 * This contains the data describing the API. This includes information
		 * about supported authentication schemes, supported namespaces, routes
		 * available on the API, and a small amount of data about the site.
		 *
		 * @since 4.4.0
		 *
		 * @param WP_REST_Response $response Response data.
		 */
		return apply_filters( 'rest_index', $response );
	}

	/**
	 * Retrieves the index for a namespace.
	 *
	 * @since 4.4.0
	 *
	 * @param WP_REST_Request $request REST request instance.
	 * @return WP_REST_Response|WP_Error WP_REST_Response instance if the index was found,
	 *                                   WP_Error if the namespace isn't set.
	 */
	public function get_namespace_index( $request ) {
		$namespace = $request['namespace'];

		if ( ! isset( $this->namespaces[ $namespace ] ) ) {
			return new WP_Error(
				'rest_invalid_namespace',
				__( 'The specified namespace could not be found.' ),
				array( 'status' => 404 )
			);
		}

		$routes    = $this->namespaces[ $namespace ];
		$endpoints = array_intersect_key( $this->get_routes(), $routes );

		$data     = array(
			'namespace' => $namespace,
			'routes'    => $this->get_data_for_routes( $endpoints, $request['context'] ),
		);
		$response = rest_ensure_response( $data );

		// Link to the root index.
		$response->add_link( 'up', rest_url( '/' ) );

		/**
		 * Filters the namespace index data.
		 *
		 * This typically is just the route data for the namespace, but you can
		 * add any data you'd like here.
		 *
		 * @since 4.4.0
		 *
		 * @param WP_REST_Response $response Response data.
		 * @param WP_REST_Request  $request  Request data. The namespace is passed as the 'namespace' parameter.
		 */
		return apply_filters( 'rest_namespace_index', $response, $request );
	}

	/**
	 * Retrieves the publicly-visible data for routes.
	 *
	 * @since 4.4.0
	 *
	 * @param array  $routes  Routes to get data for.
	 * @param string $context Optional. Context for data. Accepts 'view' or 'help'. Default 'view'.
	 * @return array[] Route data to expose in indexes, keyed by route.
	 */
	public function get_data_for_routes( $routes, $context = 'view' ) {
		$available = array();

		// Find the available routes.
		foreach ( $routes as $route => $callbacks ) {
			$data = $this->get_data_for_route( $route, $callbacks, $context );
			if ( empty( $data ) ) {
				continue;
			}

			/**
			 * Filters the REST endpoint data.
			 *
			 * @since 4.4.0
			 *
			 * @param WP_REST_Request $request Request data. The namespace is passed as the 'namespace' parameter.
			 */
			$available[ $route ] = apply_filters( 'rest_endpoints_description', $data );
		}

		/**
		 * Filters the publicly-visible data for routes.
		 *
		 * This data is exposed on indexes and can be used by clients or
		 * developers to investigate the site and find out how to use it. It
		 * acts as a form of self-documentation.
		 *
		 * @since 4.4.0
		 *
		 * @param array[] $available Route data to expose in indexes, keyed by route.
		 * @param array   $routes    Internal route data as an associative array.
		 */
		return apply_filters( 'rest_route_data', $available, $routes );
	}

	/**
	 * Retrieves publicly-visible data for the route.
	 *
	 * @since 4.4.0
	 *
	 * @param string $route     Route to get data for.
	 * @param array  $callbacks Callbacks to convert to data.
	 * @param string $context   Optional. Context for the data. Accepts 'view' or 'help'. Default 'view'.
	 * @return array|null Data for the route, or null if no publicly-visible data.
	 */
	public function get_data_for_route( $route, $callbacks, $context = 'view' ) {
		$data = array(
			'namespace' => '',
			'methods'   => array(),
			'endpoints' => array(),
		);

		if ( isset( $this->route_options[ $route ] ) ) {
			$options = $this->route_options[ $route ];

			if ( isset( $options['namespace'] ) ) {
				$data['namespace'] = $options['namespace'];
			}

			if ( isset( $options['schema'] ) && 'help' === $context ) {
				$data['schema'] = call_user_func( $options['schema'] );
			}
		}

		$route = preg_replace( '#\(\?P<(\w+?)>.*?\)#', '{$1}', $route );

		foreach ( $callbacks as $callback ) {
			// Skip to the next route if any callback is hidden.
			if ( empty( $callback['show_in_index'] ) ) {
				continue;
			}

			$data['methods'] = array_merge( $data['methods'], array_keys( $callback['methods'] ) );
			$endpoint_data   = array(
				'methods' => array_keys( $callback['methods'] ),
			);

			if ( isset( $callback['args'] ) ) {
				$endpoint_data['args'] = array();

				foreach ( $callback['args'] as $key => $opts ) {
					$arg_data = array(
						'required' => ! empty( $opts['required'] ),
					);
					if ( isset( $opts['default'] ) ) {
						$arg_data['default'] = $opts['default'];
					}
					if ( isset( $opts['enum'] ) ) {
						$arg_data['enum'] = $opts['enum'];
					}
					if ( isset( $opts['description'] ) ) {
						$arg_data['description'] = $opts['description'];
					}
					if ( isset( $opts['type'] ) ) {
						$arg_data['type'] = $opts['type'];
					}
					if ( isset( $opts['items'] ) ) {
						$arg_data['items'] = $opts['items'];
					}
					$endpoint_data['args'][ $key ] = $arg_data;
				}
			}

			$data['endpoints'][] = $endpoint_data;

			// For non-variable routes, generate links.
			if ( strpos( $route, '{' ) === false ) {
				$data['_links'] = array(
					'self' => array(
						array(
							'href' => rest_url( $route ),
						),
					),
				);
			}
		}

		if ( empty( $data['methods'] ) ) {
			// No methods supported, hide the route.
			return null;
		}

		return $data;
	}

	/**
	 * Sends an HTTP status code.
	 *
	 * @since 4.4.0
	 *
	 * @param int $code HTTP status.
	 */
	protected function set_status( $code ) {
		status_header( $code );
	}

	/**
	 * Sends an HTTP header.
	 *
	 * @since 4.4.0
	 *
	 * @param string $key Header key.
	 * @param string $value Header value.
	 */
	public function send_header( $key, $value ) {
		/*
		 * Sanitize as per RFC2616 (Section 4.2):
		 *
		 * Any LWS that occurs between field-content MAY be replaced with a
		 * single SP before interpreting the field value or forwarding the
		 * message downstream.
		 */
		$value = preg_replace( '/\s+/', ' ', $value );
		header( sprintf( '%s: %s', $key, $value ) );
	}

	/**
	 * Sends multiple HTTP headers.
	 *
	 * @since 4.4.0
	 *
	 * @param array $headers Map of header name to header value.
	 */
	public function send_headers( $headers ) {
		foreach ( $headers as $key => $value ) {
			$this->send_header( $key, $value );
		}
	}

	/**
	 * Removes an HTTP header from the current response.
	 *
	 * @since 4.8.0
	 *
	 * @param string $key Header key.
	 */
	public function remove_header( $key ) {
		header_remove( $key );
	}

	/**
	 * Retrieves the raw request entity (body).
	 *
	 * @since 4.4.0
	 *
	 * @global string $HTTP_RAW_POST_DATA Raw post data.
	 *
	 * @return string Raw request data.
	 */
	public static function get_raw_data() {
		// phpcs:disable PHPCompatibility.Variables.RemovedPredefinedGlobalVariables.http_raw_post_dataDeprecatedRemoved
		global $HTTP_RAW_POST_DATA;

		// $HTTP_RAW_POST_DATA was deprecated in PHP 5.6 and removed in PHP 7.0.
		if ( ! isset( $HTTP_RAW_POST_DATA ) ) {
			$HTTP_RAW_POST_DATA = file_get_contents( 'php://input' );
		}

		return $HTTP_RAW_POST_DATA;
		// phpcs:enable
	}

	/**
	 * Extracts headers from a PHP-style $_SERVER array.
	 *
	 * @since 4.4.0
	 *
	 * @param array $server Associative array similar to `$_SERVER`.
	 * @return array Headers extracted from the input.
	 */
	public function get_headers( $server ) {
		$headers = array();

		// CONTENT_* headers are not prefixed with HTTP_.
		$additional = array(
			'CONTENT_LENGTH' => true,
			'CONTENT_MD5'    => true,
			'CONTENT_TYPE'   => true,
		);

		foreach ( $server as $key => $value ) {
			if ( strpos( $key, 'HTTP_' ) === 0 ) {
				$headers[ substr( $key, 5 ) ] = $value;
			} elseif ( 'REDIRECT_HTTP_AUTHORIZATION' === $key && empty( $server['HTTP_AUTHORIZATION'] ) ) {
				/*
				 * In some server configurations, the authorization header is passed in this alternate location.
				 * Since it would not be passed in in both places we do not check for both headers and resolve.
				 */
				$headers['AUTHORIZATION'] = $value;
			} elseif ( isset( $additional[ $key ] ) ) {
				$headers[ $key ] = $value;
			}
		}

		return $headers;
	}
}