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class-requests.php (30431B)

---

 <?php
 /**
  * Requests for PHP
  *
  * Inspired by Requests for Python.
  *
  * Based on concepts from SimplePie_File, RequestCore and WP_Http.
  *
  * @package Requests
  */
 
 /**
  * Requests for PHP
  *
  * Inspired by Requests for Python.
  *
  * Based on concepts from SimplePie_File, RequestCore and WP_Http.
  *
  * @package Requests
  */
 class Requests {
 	/**
 	 * POST method
 	 *
 	 * @var string
 	 */
 	const POST = 'POST';
 
 	/**
 	 * PUT method
 	 *
 	 * @var string
 	 */
 	const PUT = 'PUT';
 
 	/**
 	 * GET method
 	 *
 	 * @var string
 	 */
 	const GET = 'GET';
 
 	/**
 	 * HEAD method
 	 *
 	 * @var string
 	 */
 	const HEAD = 'HEAD';
 
 	/**
 	 * DELETE method
 	 *
 	 * @var string
 	 */
 	const DELETE = 'DELETE';
 
 	/**
 	 * OPTIONS method
 	 *
 	 * @var string
 	 */
 	const OPTIONS = 'OPTIONS';
 
 	/**
 	 * TRACE method
 	 *
 	 * @var string
 	 */
 	const TRACE = 'TRACE';
 
 	/**
 	 * PATCH method
 	 *
 	 * @link https://tools.ietf.org/html/rfc5789
 	 * @var string
 	 */
 	const PATCH = 'PATCH';
 
 	/**
 	 * Default size of buffer size to read streams
 	 *
 	 * @var integer
 	 */
 	const BUFFER_SIZE = 1160;
 
 	/**
 	 * Current version of Requests
 	 *
 	 * @var string
 	 */
 	const VERSION = '1.8.1';
 
 	/**
 	 * Registered transport classes
 	 *
 	 * @var array
 	 */
 	protected static $transports = array();
 
 	/**
 	 * Selected transport name
 	 *
 	 * Use {@see get_transport()} instead
 	 *
 	 * @var array
 	 */
 	public static $transport = array();
 
 	/**
 	 * Default certificate path.
 	 *
 	 * @see Requests::get_certificate_path()
 	 * @see Requests::set_certificate_path()
 	 *
 	 * @var string
 	 */
 	protected static $certificate_path;
 
 	/**
 	 * This is a static class, do not instantiate it
 	 *
 	 * @codeCoverageIgnore
 	 */
 	private function __construct() {}
 
 	/**
 	 * Autoloader for Requests
 	 *
 	 * Register this with {@see register_autoloader()} if you'd like to avoid
 	 * having to create your own.
 	 *
 	 * (You can also use `spl_autoload_register` directly if you'd prefer.)
 	 *
 	 * @codeCoverageIgnore
 	 *
 	 * @param string $class Class name to load
 	 */
 	public static function autoloader($class) {
 		// Check that the class starts with "Requests"
 		if (strpos($class, 'Requests') !== 0) {
 			return;
 		}
 
 		$file = str_replace('_', '/', $class);
 		if (file_exists(dirname(__FILE__) . '/' . $file . '.php')) {
 			require_once dirname(__FILE__) . '/' . $file . '.php';
 		}
 	}
 
 	/**
 	 * Register the built-in autoloader
 	 *
 	 * @codeCoverageIgnore
 	 */
 	public static function register_autoloader() {
 		spl_autoload_register(array('Requests', 'autoloader'));
 	}
 
 	/**
 	 * Register a transport
 	 *
 	 * @param string $transport Transport class to add, must support the Requests_Transport interface
 	 */
 	public static function add_transport($transport) {
 		if (empty(self::$transports)) {
 			self::$transports = array(
 				'Requests_Transport_cURL',
 				'Requests_Transport_fsockopen',
 			);
 		}
 
 		self::$transports = array_merge(self::$transports, array($transport));
 	}
 
 	/**
 	 * Get a working transport
 	 *
 	 * @throws Requests_Exception If no valid transport is found (`notransport`)
 	 * @return Requests_Transport
 	 */
 	protected static function get_transport($capabilities = array()) {
 		// Caching code, don't bother testing coverage
 		// @codeCoverageIgnoreStart
 		// array of capabilities as a string to be used as an array key
 		ksort($capabilities);
 		$cap_string = serialize($capabilities);
 
 		// Don't search for a transport if it's already been done for these $capabilities
 		if (isset(self::$transport[$cap_string]) && self::$transport[$cap_string] !== null) {
 			$class = self::$transport[$cap_string];
 			return new $class();
 		}
 		// @codeCoverageIgnoreEnd
 
 		if (empty(self::$transports)) {
 			self::$transports = array(
 				'Requests_Transport_cURL',
 				'Requests_Transport_fsockopen',
 			);
 		}
 
 		// Find us a working transport
 		foreach (self::$transports as $class) {
 			if (!class_exists($class)) {
 				continue;
 			}
 
 			$result = call_user_func(array($class, 'test'), $capabilities);
 			if ($result) {
 				self::$transport[$cap_string] = $class;
 				break;
 			}
 		}
 		if (self::$transport[$cap_string] === null) {
 			throw new Requests_Exception('No working transports found', 'notransport', self::$transports);
 		}
 
 		$class = self::$transport[$cap_string];
 		return new $class();
 	}
 
 	/**#@+
 	 * @see request()
 	 * @param string $url
 	 * @param array $headers
 	 * @param array $options
 	 * @return Requests_Response
 	 */
 	/**
 	 * Send a GET request
 	 */
 	public static function get($url, $headers = array(), $options = array()) {
 		return self::request($url, $headers, null, self::GET, $options);
 	}
 
 	/**
 	 * Send a HEAD request
 	 */
 	public static function head($url, $headers = array(), $options = array()) {
 		return self::request($url, $headers, null, self::HEAD, $options);
 	}
 
 	/**
 	 * Send a DELETE request
 	 */
 	public static function delete($url, $headers = array(), $options = array()) {
 		return self::request($url, $headers, null, self::DELETE, $options);
 	}
 
 	/**
 	 * Send a TRACE request
 	 */
 	public static function trace($url, $headers = array(), $options = array()) {
 		return self::request($url, $headers, null, self::TRACE, $options);
 	}
 	/**#@-*/
 
 	/**#@+
 	 * @see request()
 	 * @param string $url
 	 * @param array $headers
 	 * @param array $data
 	 * @param array $options
 	 * @return Requests_Response
 	 */
 	/**
 	 * Send a POST request
 	 */
 	public static function post($url, $headers = array(), $data = array(), $options = array()) {
 		return self::request($url, $headers, $data, self::POST, $options);
 	}
 	/**
 	 * Send a PUT request
 	 */
 	public static function put($url, $headers = array(), $data = array(), $options = array()) {
 		return self::request($url, $headers, $data, self::PUT, $options);
 	}
 
 	/**
 	 * Send an OPTIONS request
 	 */
 	public static function options($url, $headers = array(), $data = array(), $options = array()) {
 		return self::request($url, $headers, $data, self::OPTIONS, $options);
 	}
 
 	/**
 	 * Send a PATCH request
 	 *
 	 * Note: Unlike {@see post} and {@see put}, `$headers` is required, as the
 	 * specification recommends that should send an ETag
 	 *
 	 * @link https://tools.ietf.org/html/rfc5789
 	 */
 	public static function patch($url, $headers, $data = array(), $options = array()) {
 		return self::request($url, $headers, $data, self::PATCH, $options);
 	}
 	/**#@-*/
 
 	/**
 	 * Main interface for HTTP requests
 	 *
 	 * This method initiates a request and sends it via a transport before
 	 * parsing.
 	 *
 	 * The `$options` parameter takes an associative array with the following
 	 * options:
 	 *
 	 * - `timeout`: How long should we wait for a response?
 	 *    Note: for cURL, a minimum of 1 second applies, as DNS resolution
 	 *    operates at second-resolution only.
 	 *    (float, seconds with a millisecond precision, default: 10, example: 0.01)
 	 * - `connect_timeout`: How long should we wait while trying to connect?
 	 *    (float, seconds with a millisecond precision, default: 10, example: 0.01)
 	 * - `useragent`: Useragent to send to the server
 	 *    (string, default: php-requests/$version)
 	 * - `follow_redirects`: Should we follow 3xx redirects?
 	 *    (boolean, default: true)
 	 * - `redirects`: How many times should we redirect before erroring?
 	 *    (integer, default: 10)
 	 * - `blocking`: Should we block processing on this request?
 	 *    (boolean, default: true)
 	 * - `filename`: File to stream the body to instead.
 	 *    (string|boolean, default: false)
 	 * - `auth`: Authentication handler or array of user/password details to use
 	 *    for Basic authentication
 	 *    (Requests_Auth|array|boolean, default: false)
 	 * - `proxy`: Proxy details to use for proxy by-passing and authentication
 	 *    (Requests_Proxy|array|string|boolean, default: false)
 	 * - `max_bytes`: Limit for the response body size.
 	 *    (integer|boolean, default: false)
 	 * - `idn`: Enable IDN parsing
 	 *    (boolean, default: true)
 	 * - `transport`: Custom transport. Either a class name, or a
 	 *    transport object. Defaults to the first working transport from
 	 *    {@see getTransport()}
 	 *    (string|Requests_Transport, default: {@see getTransport()})
 	 * - `hooks`: Hooks handler.
 	 *    (Requests_Hooker, default: new Requests_Hooks())
 	 * - `verify`: Should we verify SSL certificates? Allows passing in a custom
 	 *    certificate file as a string. (Using true uses the system-wide root
 	 *    certificate store instead, but this may have different behaviour
 	 *    across transports.)
 	 *    (string|boolean, default: library/Requests/Transport/cacert.pem)
 	 * - `verifyname`: Should we verify the common name in the SSL certificate?
 	 *    (boolean, default: true)
 	 * - `data_format`: How should we send the `$data` parameter?
 	 *    (string, one of 'query' or 'body', default: 'query' for
 	 *    HEAD/GET/DELETE, 'body' for POST/PUT/OPTIONS/PATCH)
 	 *
 	 * @throws Requests_Exception On invalid URLs (`nonhttp`)
 	 *
 	 * @param string $url URL to request
 	 * @param array $headers Extra headers to send with the request
 	 * @param array|null $data Data to send either as a query string for GET/HEAD requests, or in the body for POST requests
 	 * @param string $type HTTP request type (use Requests constants)
 	 * @param array $options Options for the request (see description for more information)
 	 * @return Requests_Response
 	 */
 	public static function request($url, $headers = array(), $data = array(), $type = self::GET, $options = array()) {
 		if (empty($options['type'])) {
 			$options['type'] = $type;
 		}
 		$options = array_merge(self::get_default_options(), $options);
 
 		self::set_defaults($url, $headers, $data, $type, $options);
 
 		$options['hooks']->dispatch('requests.before_request', array(&$url, &$headers, &$data, &$type, &$options));
 
 		if (!empty($options['transport'])) {
 			$transport = $options['transport'];
 
 			if (is_string($options['transport'])) {
 				$transport = new $transport();
 			}
 		}
 		else {
 			$need_ssl     = (stripos($url, 'https://') === 0);
 			$capabilities = array('ssl' => $need_ssl);
 			$transport    = self::get_transport($capabilities);
 		}
 		$response = $transport->request($url, $headers, $data, $options);
 
 		$options['hooks']->dispatch('requests.before_parse', array(&$response, $url, $headers, $data, $type, $options));
 
 		return self::parse_response($response, $url, $headers, $data, $options);
 	}
 
 	/**
 	 * Send multiple HTTP requests simultaneously
 	 *
 	 * The `$requests` parameter takes an associative or indexed array of
 	 * request fields. The key of each request can be used to match up the
 	 * request with the returned data, or with the request passed into your
 	 * `multiple.request.complete` callback.
 	 *
 	 * The request fields value is an associative array with the following keys:
 	 *
 	 * - `url`: Request URL Same as the `$url` parameter to
 	 *    {@see Requests::request}
 	 *    (string, required)
 	 * - `headers`: Associative array of header fields. Same as the `$headers`
 	 *    parameter to {@see Requests::request}
 	 *    (array, default: `array()`)
 	 * - `data`: Associative array of data fields or a string. Same as the
 	 *    `$data` parameter to {@see Requests::request}
 	 *    (array|string, default: `array()`)
 	 * - `type`: HTTP request type (use Requests constants). Same as the `$type`
 	 *    parameter to {@see Requests::request}
 	 *    (string, default: `Requests::GET`)
 	 * - `cookies`: Associative array of cookie name to value, or cookie jar.
 	 *    (array|Requests_Cookie_Jar)
 	 *
 	 * If the `$options` parameter is specified, individual requests will
 	 * inherit options from it. This can be used to use a single hooking system,
 	 * or set all the types to `Requests::POST`, for example.
 	 *
 	 * In addition, the `$options` parameter takes the following global options:
 	 *
 	 * - `complete`: A callback for when a request is complete. Takes two
 	 *    parameters, a Requests_Response/Requests_Exception reference, and the
 	 *    ID from the request array (Note: this can also be overridden on a
 	 *    per-request basis, although that's a little silly)
 	 *    (callback)
 	 *
 	 * @param array $requests Requests data (see description for more information)
 	 * @param array $options Global and default options (see {@see Requests::request})
 	 * @return array Responses (either Requests_Response or a Requests_Exception object)
 	 */
 	public static function request_multiple($requests, $options = array()) {
 		$options = array_merge(self::get_default_options(true), $options);
 
 		if (!empty($options['hooks'])) {
 			$options['hooks']->register('transport.internal.parse_response', array('Requests', 'parse_multiple'));
 			if (!empty($options['complete'])) {
 				$options['hooks']->register('multiple.request.complete', $options['complete']);
 			}
 		}
 
 		foreach ($requests as $id => &$request) {
 			if (!isset($request['headers'])) {
 				$request['headers'] = array();
 			}
 			if (!isset($request['data'])) {
 				$request['data'] = array();
 			}
 			if (!isset($request['type'])) {
 				$request['type'] = self::GET;
 			}
 			if (!isset($request['options'])) {
 				$request['options']         = $options;
 				$request['options']['type'] = $request['type'];
 			}
 			else {
 				if (empty($request['options']['type'])) {
 					$request['options']['type'] = $request['type'];
 				}
 				$request['options'] = array_merge($options, $request['options']);
 			}
 
 			self::set_defaults($request['url'], $request['headers'], $request['data'], $request['type'], $request['options']);
 
 			// Ensure we only hook in once
 			if ($request['options']['hooks'] !== $options['hooks']) {
 				$request['options']['hooks']->register('transport.internal.parse_response', array('Requests', 'parse_multiple'));
 				if (!empty($request['options']['complete'])) {
 					$request['options']['hooks']->register('multiple.request.complete', $request['options']['complete']);
 				}
 			}
 		}
 		unset($request);
 
 		if (!empty($options['transport'])) {
 			$transport = $options['transport'];
 
 			if (is_string($options['transport'])) {
 				$transport = new $transport();
 			}
 		}
 		else {
 			$transport = self::get_transport();
 		}
 		$responses = $transport->request_multiple($requests, $options);
 
 		foreach ($responses as $id => &$response) {
 			// If our hook got messed with somehow, ensure we end up with the
 			// correct response
 			if (is_string($response)) {
 				$request = $requests[$id];
 				self::parse_multiple($response, $request);
 				$request['options']['hooks']->dispatch('multiple.request.complete', array(&$response, $id));
 			}
 		}
 
 		return $responses;
 	}
 
 	/**
 	 * Get the default options
 	 *
 	 * @see Requests::request() for values returned by this method
 	 * @param boolean $multirequest Is this a multirequest?
 	 * @return array Default option values
 	 */
 	protected static function get_default_options($multirequest = false) {
 		$defaults = array(
 			'timeout'          => 10,
 			'connect_timeout'  => 10,
 			'useragent'        => 'php-requests/' . self::VERSION,
 			'protocol_version' => 1.1,
 			'redirected'       => 0,
 			'redirects'        => 10,
 			'follow_redirects' => true,
 			'blocking'         => true,
 			'type'             => self::GET,
 			'filename'         => false,
 			'auth'             => false,
 			'proxy'            => false,
 			'cookies'          => false,
 			'max_bytes'        => false,
 			'idn'              => true,
 			'hooks'            => null,
 			'transport'        => null,
 			'verify'           => self::get_certificate_path(),
 			'verifyname'       => true,
 		);
 		if ($multirequest !== false) {
 			$defaults['complete'] = null;
 		}
 		return $defaults;
 	}
 
 	/**
 	 * Get default certificate path.
 	 *
 	 * @return string Default certificate path.
 	 */
 	public static function get_certificate_path() {
 		if (!empty(self::$certificate_path)) {
 			return self::$certificate_path;
 		}
 
 		return dirname(__FILE__) . '/Requests/Transport/cacert.pem';
 	}
 
 	/**
 	 * Set default certificate path.
 	 *
 	 * @param string $path Certificate path, pointing to a PEM file.
 	 */
 	public static function set_certificate_path($path) {
 		self::$certificate_path = $path;
 	}
 
 	/**
 	 * Set the default values
 	 *
 	 * @param string $url URL to request
 	 * @param array $headers Extra headers to send with the request
 	 * @param array|null $data Data to send either as a query string for GET/HEAD requests, or in the body for POST requests
 	 * @param string $type HTTP request type
 	 * @param array $options Options for the request
 	 * @return array $options
 	 */
 	protected static function set_defaults(&$url, &$headers, &$data, &$type, &$options) {
 		if (!preg_match('/^http(s)?:\/\//i', $url, $matches)) {
 			throw new Requests_Exception('Only HTTP(S) requests are handled.', 'nonhttp', $url);
 		}
 
 		if (empty($options['hooks'])) {
 			$options['hooks'] = new Requests_Hooks();
 		}
 
 		if (is_array($options['auth'])) {
 			$options['auth'] = new Requests_Auth_Basic($options['auth']);
 		}
 		if ($options['auth'] !== false) {
 			$options['auth']->register($options['hooks']);
 		}
 
 		if (is_string($options['proxy']) || is_array($options['proxy'])) {
 			$options['proxy'] = new Requests_Proxy_HTTP($options['proxy']);
 		}
 		if ($options['proxy'] !== false) {
 			$options['proxy']->register($options['hooks']);
 		}
 
 		if (is_array($options['cookies'])) {
 			$options['cookies'] = new Requests_Cookie_Jar($options['cookies']);
 		}
 		elseif (empty($options['cookies'])) {
 			$options['cookies'] = new Requests_Cookie_Jar();
 		}
 		if ($options['cookies'] !== false) {
 			$options['cookies']->register($options['hooks']);
 		}
 
 		if ($options['idn'] !== false) {
 			$iri       = new Requests_IRI($url);
 			$iri->host = Requests_IDNAEncoder::encode($iri->ihost);
 			$url       = $iri->uri;
 		}
 
 		// Massage the type to ensure we support it.
 		$type = strtoupper($type);
 
 		if (!isset($options['data_format'])) {
 			if (in_array($type, array(self::HEAD, self::GET, self::DELETE), true)) {
 				$options['data_format'] = 'query';
 			}
 			else {
 				$options['data_format'] = 'body';
 			}
 		}
 	}
 
 	/**
 	 * HTTP response parser
 	 *
 	 * @throws Requests_Exception On missing head/body separator (`requests.no_crlf_separator`)
 	 * @throws Requests_Exception On missing head/body separator (`noversion`)
 	 * @throws Requests_Exception On missing head/body separator (`toomanyredirects`)
 	 *
 	 * @param string $headers Full response text including headers and body
 	 * @param string $url Original request URL
 	 * @param array $req_headers Original $headers array passed to {@link request()}, in case we need to follow redirects
 	 * @param array $req_data Original $data array passed to {@link request()}, in case we need to follow redirects
 	 * @param array $options Original $options array passed to {@link request()}, in case we need to follow redirects
 	 * @return Requests_Response
 	 */
 	protected static function parse_response($headers, $url, $req_headers, $req_data, $options) {
 		$return = new Requests_Response();
 		if (!$options['blocking']) {
 			return $return;
 		}
 
 		$return->raw  = $headers;
 		$return->url  = (string) $url;
 		$return->body = '';
 
 		if (!$options['filename']) {
 			$pos = strpos($headers, "\r\n\r\n");
 			if ($pos === false) {
 				// Crap!
 				throw new Requests_Exception('Missing header/body separator', 'requests.no_crlf_separator');
 			}
 
 			$headers = substr($return->raw, 0, $pos);
 			// Headers will always be separated from the body by two new lines - `\n\r\n\r`.
 			$body = substr($return->raw, $pos + 4);
 			if (!empty($body)) {
 				$return->body = $body;
 			}
 		}
 		// Pretend CRLF = LF for compatibility (RFC 2616, section 19.3)
 		$headers = str_replace("\r\n", "\n", $headers);
 		// Unfold headers (replace [CRLF] 1*( SP | HT ) with SP) as per RFC 2616 (section 2.2)
 		$headers = preg_replace('/\n[ \t]/', ' ', $headers);
 		$headers = explode("\n", $headers);
 		preg_match('#^HTTP/(1\.\d)[ \t]+(\d+)#i', array_shift($headers), $matches);
 		if (empty($matches)) {
 			throw new Requests_Exception('Response could not be parsed', 'noversion', $headers);
 		}
 		$return->protocol_version = (float) $matches[1];
 		$return->status_code      = (int) $matches[2];
 		if ($return->status_code >= 200 && $return->status_code < 300) {
 			$return->success = true;
 		}
 
 		foreach ($headers as $header) {
 			list($key, $value) = explode(':', $header, 2);
 			$value             = trim($value);
 			preg_replace('#(\s+)#i', ' ', $value);
 			$return->headers[$key] = $value;
 		}
 		if (isset($return->headers['transfer-encoding'])) {
 			$return->body = self::decode_chunked($return->body);
 			unset($return->headers['transfer-encoding']);
 		}
 		if (isset($return->headers['content-encoding'])) {
 			$return->body = self::decompress($return->body);
 		}
 
 		//fsockopen and cURL compatibility
 		if (isset($return->headers['connection'])) {
 			unset($return->headers['connection']);
 		}
 
 		$options['hooks']->dispatch('requests.before_redirect_check', array(&$return, $req_headers, $req_data, $options));
 
 		if ($return->is_redirect() && $options['follow_redirects'] === true) {
 			if (isset($return->headers['location']) && $options['redirected'] < $options['redirects']) {
 				if ($return->status_code === 303) {
 					$options['type'] = self::GET;
 				}
 				$options['redirected']++;
 				$location = $return->headers['location'];
 				if (strpos($location, 'http://') !== 0 && strpos($location, 'https://') !== 0) {
 					// relative redirect, for compatibility make it absolute
 					$location = Requests_IRI::absolutize($url, $location);
 					$location = $location->uri;
 				}
 
 				$hook_args = array(
 					&$location,
 					&$req_headers,
 					&$req_data,
 					&$options,
 					$return,
 				);
 				$options['hooks']->dispatch('requests.before_redirect', $hook_args);
 				$redirected            = self::request($location, $req_headers, $req_data, $options['type'], $options);
 				$redirected->history[] = $return;
 				return $redirected;
 			}
 			elseif ($options['redirected'] >= $options['redirects']) {
 				throw new Requests_Exception('Too many redirects', 'toomanyredirects', $return);
 			}
 		}
 
 		$return->redirects = $options['redirected'];
 
 		$options['hooks']->dispatch('requests.after_request', array(&$return, $req_headers, $req_data, $options));
 		return $return;
 	}
 
 	/**
 	 * Callback for `transport.internal.parse_response`
 	 *
 	 * Internal use only. Converts a raw HTTP response to a Requests_Response
 	 * while still executing a multiple request.
 	 *
 	 * @param string $response Full response text including headers and body (will be overwritten with Response instance)
 	 * @param array $request Request data as passed into {@see Requests::request_multiple()}
 	 * @return null `$response` is either set to a Requests_Response instance, or a Requests_Exception object
 	 */
 	public static function parse_multiple(&$response, $request) {
 		try {
 			$url      = $request['url'];
 			$headers  = $request['headers'];
 			$data     = $request['data'];
 			$options  = $request['options'];
 			$response = self::parse_response($response, $url, $headers, $data, $options);
 		}
 		catch (Requests_Exception $e) {
 			$response = $e;
 		}
 	}
 
 	/**
 	 * Decoded a chunked body as per RFC 2616
 	 *
 	 * @see https://tools.ietf.org/html/rfc2616#section-3.6.1
 	 * @param string $data Chunked body
 	 * @return string Decoded body
 	 */
 	protected static function decode_chunked($data) {
 		if (!preg_match('/^([0-9a-f]+)(?:;(?:[\w-]*)(?:=(?:(?:[\w-]*)*|"(?:[^\r\n])*"))?)*\r\n/i', trim($data))) {
 			return $data;
 		}
 
 		$decoded = '';
 		$encoded = $data;
 
 		while (true) {
 			$is_chunked = (bool) preg_match('/^([0-9a-f]+)(?:;(?:[\w-]*)(?:=(?:(?:[\w-]*)*|"(?:[^\r\n])*"))?)*\r\n/i', $encoded, $matches);
 			if (!$is_chunked) {
 				// Looks like it's not chunked after all
 				return $data;
 			}
 
 			$length = hexdec(trim($matches[1]));
 			if ($length === 0) {
 				// Ignore trailer headers
 				return $decoded;
 			}
 
 			$chunk_length = strlen($matches[0]);
 			$decoded     .= substr($encoded, $chunk_length, $length);
 			$encoded      = substr($encoded, $chunk_length + $length + 2);
 
 			if (trim($encoded) === '0' || empty($encoded)) {
 				return $decoded;
 			}
 		}
 
 		// We'll never actually get down here
 		// @codeCoverageIgnoreStart
 	}
 	// @codeCoverageIgnoreEnd
 
 	/**
 	 * Convert a key => value array to a 'key: value' array for headers
 	 *
 	 * @param array $array Dictionary of header values
 	 * @return array List of headers
 	 */
 	public static function flatten($array) {
 		$return = array();
 		foreach ($array as $key => $value) {
 			$return[] = sprintf('%s: %s', $key, $value);
 		}
 		return $return;
 	}
 
 	/**
 	 * Convert a key => value array to a 'key: value' array for headers
 	 *
 	 * @codeCoverageIgnore
 	 * @deprecated Misspelling of {@see Requests::flatten}
 	 * @param array $array Dictionary of header values
 	 * @return array List of headers
 	 */
 	public static function flattern($array) {
 		return self::flatten($array);
 	}
 
 	/**
 	 * Decompress an encoded body
 	 *
 	 * Implements gzip, compress and deflate. Guesses which it is by attempting
 	 * to decode.
 	 *
 	 * @param string $data Compressed data in one of the above formats
 	 * @return string Decompressed string
 	 */
 	public static function decompress($data) {
 		if (substr($data, 0, 2) !== "\x1f\x8b" && substr($data, 0, 2) !== "\x78\x9c") {
 			// Not actually compressed. Probably cURL ruining this for us.
 			return $data;
 		}
 
 		if (function_exists('gzdecode')) {
 			// phpcs:ignore PHPCompatibility.FunctionUse.NewFunctions.gzdecodeFound -- Wrapped in function_exists() for PHP 5.2.
 			$decoded = @gzdecode($data);
 			if ($decoded !== false) {
 				return $decoded;
 			}
 		}
 
 		if (function_exists('gzinflate')) {
 			$decoded = @gzinflate($data);
 			if ($decoded !== false) {
 				return $decoded;
 			}
 		}
 
 		$decoded = self::compatible_gzinflate($data);
 		if ($decoded !== false) {
 			return $decoded;
 		}
 
 		if (function_exists('gzuncompress')) {
 			$decoded = @gzuncompress($data);
 			if ($decoded !== false) {
 				return $decoded;
 			}
 		}
 
 		return $data;
 	}
 
 	/**
 	 * Decompression of deflated string while staying compatible with the majority of servers.
 	 *
 	 * Certain Servers will return deflated data with headers which PHP's gzinflate()
 	 * function cannot handle out of the box. The following function has been created from
 	 * various snippets on the gzinflate() PHP documentation.
 	 *
 	 * Warning: Magic numbers within. Due to the potential different formats that the compressed
 	 * data may be returned in, some "magic offsets" are needed to ensure proper decompression
 	 * takes place. For a simple progmatic way to determine the magic offset in use, see:
 	 * https://core.trac.wordpress.org/ticket/18273
 	 *
 	 * @since 2.8.1
 	 * @link https://core.trac.wordpress.org/ticket/18273
 	 * @link https://secure.php.net/manual/en/function.gzinflate.php#70875
 	 * @link https://secure.php.net/manual/en/function.gzinflate.php#77336
 	 *
 	 * @param string $gz_data String to decompress.
 	 * @return string|bool False on failure.
 	 */
 	public static function compatible_gzinflate($gz_data) {
 		// Compressed data might contain a full zlib header, if so strip it for
 		// gzinflate()
 		if (substr($gz_data, 0, 3) === "\x1f\x8b\x08") {
 			$i   = 10;
 			$flg = ord(substr($gz_data, 3, 1));
 			if ($flg > 0) {
 				if ($flg & 4) {
 					list($xlen) = unpack('v', substr($gz_data, $i, 2));
 					$i         += 2 + $xlen;
 				}
 				if ($flg & 8) {
 					$i = strpos($gz_data, "\0", $i) + 1;
 				}
 				if ($flg & 16) {
 					$i = strpos($gz_data, "\0", $i) + 1;
 				}
 				if ($flg & 2) {
 					$i += 2;
 				}
 			}
 			$decompressed = self::compatible_gzinflate(substr($gz_data, $i));
 			if ($decompressed !== false) {
 				return $decompressed;
 			}
 		}
 
 		// If the data is Huffman Encoded, we must first strip the leading 2
 		// byte Huffman marker for gzinflate()
 		// The response is Huffman coded by many compressors such as
 		// java.util.zip.Deflater, Ruby’s Zlib::Deflate, and .NET's
 		// System.IO.Compression.DeflateStream.
 		//
 		// See https://decompres.blogspot.com/ for a quick explanation of this
 		// data type
 		$huffman_encoded = false;
 
 		// low nibble of first byte should be 0x08
 		list(, $first_nibble) = unpack('h', $gz_data);
 
 		// First 2 bytes should be divisible by 0x1F
 		list(, $first_two_bytes) = unpack('n', $gz_data);
 
 		if ($first_nibble === 0x08 && ($first_two_bytes % 0x1F) === 0) {
 			$huffman_encoded = true;
 		}
 
 		if ($huffman_encoded) {
 			$decompressed = @gzinflate(substr($gz_data, 2));
 			if ($decompressed !== false) {
 				return $decompressed;
 			}
 		}
 
 		if (substr($gz_data, 0, 4) === "\x50\x4b\x03\x04") {
 			// ZIP file format header
 			// Offset 6: 2 bytes, General-purpose field
 			// Offset 26: 2 bytes, filename length
 			// Offset 28: 2 bytes, optional field length
 			// Offset 30: Filename field, followed by optional field, followed
 			// immediately by data
 			list(, $general_purpose_flag) = unpack('v', substr($gz_data, 6, 2));
 
 			// If the file has been compressed on the fly, 0x08 bit is set of
 			// the general purpose field. We can use this to differentiate
 			// between a compressed document, and a ZIP file
 			$zip_compressed_on_the_fly = ((0x08 & $general_purpose_flag) === 0x08);
 
 			if (!$zip_compressed_on_the_fly) {
 				// Don't attempt to decode a compressed zip file
 				return $gz_data;
 			}
 
 			// Determine the first byte of data, based on the above ZIP header
 			// offsets:
 			$first_file_start = array_sum(unpack('v2', substr($gz_data, 26, 4)));
 			$decompressed     = @gzinflate(substr($gz_data, 30 + $first_file_start));
 			if ($decompressed !== false) {
 				return $decompressed;
 			}
 			return false;
 		}
 
 		// Finally fall back to straight gzinflate
 		$decompressed = @gzinflate($gz_data);
 		if ($decompressed !== false) {
 			return $decompressed;
 		}
 
 		// Fallback for all above failing, not expected, but included for
 		// debugging and preventing regressions and to track stats
 		$decompressed = @gzinflate(substr($gz_data, 2));
 		if ($decompressed !== false) {
 			return $decompressed;
 		}
 
 		return false;
 	}
 
 	public static function match_domain($host, $reference) {
 		// Check for a direct match
 		if ($host === $reference) {
 			return true;
 		}
 
 		// Calculate the valid wildcard match if the host is not an IP address
 		// Also validates that the host has 3 parts or more, as per Firefox's
 		// ruleset.
 		$parts = explode('.', $host);
 		if (ip2long($host) === false && count($parts) >= 3) {
 			$parts[0] = '*';
 			$wildcard = implode('.', $parts);
 			if ($wildcard === $reference) {
 				return true;
 			}
 		}
 
 		return false;
 	}
 }