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1 files changed, 2154 insertions, 0 deletions

diff --git a/assets/php/vendor/symfony/http-foundation/Request.php b/assets/php/vendor/symfony/http-foundation/Request.php
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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation;
+
+use Symfony\Component\HttpFoundation\Exception\ConflictingHeadersException;
+use Symfony\Component\HttpFoundation\Exception\SuspiciousOperationException;
+use Symfony\Component\HttpFoundation\Session\SessionInterface;
+
+/**
+ * Request represents an HTTP request.
+ *
+ * The methods dealing with URL accept / return a raw path (% encoded):
+ *   * getBasePath
+ *   * getBaseUrl
+ *   * getPathInfo
+ *   * getRequestUri
+ *   * getUri
+ *   * getUriForPath
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Request
+{
+    const HEADER_FORWARDED = 0b00001; // When using RFC 7239
+    const HEADER_X_FORWARDED_FOR = 0b00010;
+    const HEADER_X_FORWARDED_HOST = 0b00100;
+    const HEADER_X_FORWARDED_PROTO = 0b01000;
+    const HEADER_X_FORWARDED_PORT = 0b10000;
+    const HEADER_X_FORWARDED_ALL = 0b11110; // All "X-Forwarded-*" headers
+    const HEADER_X_FORWARDED_AWS_ELB = 0b11010; // AWS ELB doesn't send X-Forwarded-Host
+
+    /** @deprecated since version 3.3, to be removed in 4.0 */
+    const HEADER_CLIENT_IP = self::HEADER_X_FORWARDED_FOR;
+    /** @deprecated since version 3.3, to be removed in 4.0 */
+    const HEADER_CLIENT_HOST = self::HEADER_X_FORWARDED_HOST;
+    /** @deprecated since version 3.3, to be removed in 4.0 */
+    const HEADER_CLIENT_PROTO = self::HEADER_X_FORWARDED_PROTO;
+    /** @deprecated since version 3.3, to be removed in 4.0 */
+    const HEADER_CLIENT_PORT = self::HEADER_X_FORWARDED_PORT;
+
+    const METHOD_HEAD = 'HEAD';
+    const METHOD_GET = 'GET';
+    const METHOD_POST = 'POST';
+    const METHOD_PUT = 'PUT';
+    const METHOD_PATCH = 'PATCH';
+    const METHOD_DELETE = 'DELETE';
+    const METHOD_PURGE = 'PURGE';
+    const METHOD_OPTIONS = 'OPTIONS';
+    const METHOD_TRACE = 'TRACE';
+    const METHOD_CONNECT = 'CONNECT';
+
+    /**
+     * @var string[]
+     */
+    protected static $trustedProxies = array();
+
+    /**
+     * @var string[]
+     */
+    protected static $trustedHostPatterns = array();
+
+    /**
+     * @var string[]
+     */
+    protected static $trustedHosts = array();
+
+    /**
+     * Names for headers that can be trusted when
+     * using trusted proxies.
+     *
+     * The FORWARDED header is the standard as of rfc7239.
+     *
+     * The other headers are non-standard, but widely used
+     * by popular reverse proxies (like Apache mod_proxy or Amazon EC2).
+     *
+     * @deprecated since version 3.3, to be removed in 4.0
+     */
+    protected static $trustedHeaders = array(
+        self::HEADER_FORWARDED => 'FORWARDED',
+        self::HEADER_CLIENT_IP => 'X_FORWARDED_FOR',
+        self::HEADER_CLIENT_HOST => 'X_FORWARDED_HOST',
+        self::HEADER_CLIENT_PROTO => 'X_FORWARDED_PROTO',
+        self::HEADER_CLIENT_PORT => 'X_FORWARDED_PORT',
+    );
+
+    protected static $httpMethodParameterOverride = false;
+
+    /**
+     * Custom parameters.
+     *
+     * @var \Symfony\Component\HttpFoundation\ParameterBag
+     */
+    public $attributes;
+
+    /**
+     * Request body parameters ($_POST).
+     *
+     * @var \Symfony\Component\HttpFoundation\ParameterBag
+     */
+    public $request;
+
+    /**
+     * Query string parameters ($_GET).
+     *
+     * @var \Symfony\Component\HttpFoundation\ParameterBag
+     */
+    public $query;
+
+    /**
+     * Server and execution environment parameters ($_SERVER).
+     *
+     * @var \Symfony\Component\HttpFoundation\ServerBag
+     */
+    public $server;
+
+    /**
+     * Uploaded files ($_FILES).
+     *
+     * @var \Symfony\Component\HttpFoundation\FileBag
+     */
+    public $files;
+
+    /**
+     * Cookies ($_COOKIE).
+     *
+     * @var \Symfony\Component\HttpFoundation\ParameterBag
+     */
+    public $cookies;
+
+    /**
+     * Headers (taken from the $_SERVER).
+     *
+     * @var \Symfony\Component\HttpFoundation\HeaderBag
+     */
+    public $headers;
+
+    /**
+     * @var string|resource|false|null
+     */
+    protected $content;
+
+    /**
+     * @var array
+     */
+    protected $languages;
+
+    /**
+     * @var array
+     */
+    protected $charsets;
+
+    /**
+     * @var array
+     */
+    protected $encodings;
+
+    /**
+     * @var array
+     */
+    protected $acceptableContentTypes;
+
+    /**
+     * @var string
+     */
+    protected $pathInfo;
+
+    /**
+     * @var string
+     */
+    protected $requestUri;
+
+    /**
+     * @var string
+     */
+    protected $baseUrl;
+
+    /**
+     * @var string
+     */
+    protected $basePath;
+
+    /**
+     * @var string
+     */
+    protected $method;
+
+    /**
+     * @var string
+     */
+    protected $format;
+
+    /**
+     * @var \Symfony\Component\HttpFoundation\Session\SessionInterface
+     */
+    protected $session;
+
+    /**
+     * @var string
+     */
+    protected $locale;
+
+    /**
+     * @var string
+     */
+    protected $defaultLocale = 'en';
+
+    /**
+     * @var array
+     */
+    protected static $formats;
+
+    protected static $requestFactory;
+
+    private $isHostValid = true;
+    private $isForwardedValid = true;
+
+    private static $trustedHeaderSet = -1;
+
+    /** @deprecated since version 3.3, to be removed in 4.0 */
+    private static $trustedHeaderNames = array(
+        self::HEADER_FORWARDED => 'FORWARDED',
+        self::HEADER_CLIENT_IP => 'X_FORWARDED_FOR',
+        self::HEADER_CLIENT_HOST => 'X_FORWARDED_HOST',
+        self::HEADER_CLIENT_PROTO => 'X_FORWARDED_PROTO',
+        self::HEADER_CLIENT_PORT => 'X_FORWARDED_PORT',
+    );
+
+    private static $forwardedParams = array(
+        self::HEADER_X_FORWARDED_FOR => 'for',
+        self::HEADER_X_FORWARDED_HOST => 'host',
+        self::HEADER_X_FORWARDED_PROTO => 'proto',
+        self::HEADER_X_FORWARDED_PORT => 'host',
+    );
+
+    /**
+     * @param array                $query      The GET parameters
+     * @param array                $request    The POST parameters
+     * @param array                $attributes The request attributes (parameters parsed from the PATH_INFO, ...)
+     * @param array                $cookies    The COOKIE parameters
+     * @param array                $files      The FILES parameters
+     * @param array                $server     The SERVER parameters
+     * @param string|resource|null $content    The raw body data
+     */
+    public function __construct(array $query = array(), array $request = array(), array $attributes = array(), array $cookies = array(), array $files = array(), array $server = array(), $content = null)
+    {
+        $this->initialize($query, $request, $attributes, $cookies, $files, $server, $content);
+    }
+
+    /**
+     * Sets the parameters for this request.
+     *
+     * This method also re-initializes all properties.
+     *
+     * @param array                $query      The GET parameters
+     * @param array                $request    The POST parameters
+     * @param array                $attributes The request attributes (parameters parsed from the PATH_INFO, ...)
+     * @param array                $cookies    The COOKIE parameters
+     * @param array                $files      The FILES parameters
+     * @param array                $server     The SERVER parameters
+     * @param string|resource|null $content    The raw body data
+     */
+    public function initialize(array $query = array(), array $request = array(), array $attributes = array(), array $cookies = array(), array $files = array(), array $server = array(), $content = null)
+    {
+        $this->request = new ParameterBag($request);
+        $this->query = new ParameterBag($query);
+        $this->attributes = new ParameterBag($attributes);
+        $this->cookies = new ParameterBag($cookies);
+        $this->files = new FileBag($files);
+        $this->server = new ServerBag($server);
+        $this->headers = new HeaderBag($this->server->getHeaders());
+
+        $this->content = $content;
+        $this->languages = null;
+        $this->charsets = null;
+        $this->encodings = null;
+        $this->acceptableContentTypes = null;
+        $this->pathInfo = null;
+        $this->requestUri = null;
+        $this->baseUrl = null;
+        $this->basePath = null;
+        $this->method = null;
+        $this->format = null;
+    }
+
+    /**
+     * Creates a new request with values from PHP's super globals.
+     *
+     * @return static
+     */
+    public static function createFromGlobals()
+    {
+        // With the php's bug #66606, the php's built-in web server
+        // stores the Content-Type and Content-Length header values in
+        // HTTP_CONTENT_TYPE and HTTP_CONTENT_LENGTH fields.
+        $server = $_SERVER;
+        if ('cli-server' === PHP_SAPI) {
+            if (array_key_exists('HTTP_CONTENT_LENGTH', $_SERVER)) {
+                $server['CONTENT_LENGTH'] = $_SERVER['HTTP_CONTENT_LENGTH'];
+            }
+            if (array_key_exists('HTTP_CONTENT_TYPE', $_SERVER)) {
+                $server['CONTENT_TYPE'] = $_SERVER['HTTP_CONTENT_TYPE'];
+            }
+        }
+
+        $request = self::createRequestFromFactory($_GET, $_POST, array(), $_COOKIE, $_FILES, $server);
+
+        if (0 === strpos($request->headers->get('CONTENT_TYPE'), 'application/x-www-form-urlencoded')
+            && in_array(strtoupper($request->server->get('REQUEST_METHOD', 'GET')), array('PUT', 'DELETE', 'PATCH'))
+        ) {
+            parse_str($request->getContent(), $data);
+            $request->request = new ParameterBag($data);
+        }
+
+        return $request;
+    }
+
+    /**
+     * Creates a Request based on a given URI and configuration.
+     *
+     * The information contained in the URI always take precedence
+     * over the other information (server and parameters).
+     *
+     * @param string               $uri        The URI
+     * @param string               $method     The HTTP method
+     * @param array                $parameters The query (GET) or request (POST) parameters
+     * @param array                $cookies    The request cookies ($_COOKIE)
+     * @param array                $files      The request files ($_FILES)
+     * @param array                $server     The server parameters ($_SERVER)
+     * @param string|resource|null $content    The raw body data
+     *
+     * @return static
+     */
+    public static function create($uri, $method = 'GET', $parameters = array(), $cookies = array(), $files = array(), $server = array(), $content = null)
+    {
+        $server = array_replace(array(
+            'SERVER_NAME' => 'localhost',
+            'SERVER_PORT' => 80,
+            'HTTP_HOST' => 'localhost',
+            'HTTP_USER_AGENT' => 'Symfony/3.X',
+            'HTTP_ACCEPT' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
+            'HTTP_ACCEPT_LANGUAGE' => 'en-us,en;q=0.5',
+            'HTTP_ACCEPT_CHARSET' => 'ISO-8859-1,utf-8;q=0.7,*;q=0.7',
+            'REMOTE_ADDR' => '127.0.0.1',
+            'SCRIPT_NAME' => '',
+            'SCRIPT_FILENAME' => '',
+            'SERVER_PROTOCOL' => 'HTTP/1.1',
+            'REQUEST_TIME' => time(),
+        ), $server);
+
+        $server['PATH_INFO'] = '';
+        $server['REQUEST_METHOD'] = strtoupper($method);
+
+        $components = parse_url($uri);
+        if (isset($components['host'])) {
+            $server['SERVER_NAME'] = $components['host'];
+            $server['HTTP_HOST'] = $components['host'];
+        }
+
+        if (isset($components['scheme'])) {
+            if ('https' === $components['scheme']) {
+                $server['HTTPS'] = 'on';
+                $server['SERVER_PORT'] = 443;
+            } else {
+                unset($server['HTTPS']);
+                $server['SERVER_PORT'] = 80;
+            }
+        }
+
+        if (isset($components['port'])) {
+            $server['SERVER_PORT'] = $components['port'];
+            $server['HTTP_HOST'] = $server['HTTP_HOST'].':'.$components['port'];
+        }
+
+        if (isset($components['user'])) {
+            $server['PHP_AUTH_USER'] = $components['user'];
+        }
+
+        if (isset($components['pass'])) {
+            $server['PHP_AUTH_PW'] = $components['pass'];
+        }
+
+        if (!isset($components['path'])) {
+            $components['path'] = '/';
+        }
+
+        switch (strtoupper($method)) {
+            case 'POST':
+            case 'PUT':
+            case 'DELETE':
+                if (!isset($server['CONTENT_TYPE'])) {
+                    $server['CONTENT_TYPE'] = 'application/x-www-form-urlencoded';
+                }
+                // no break
+            case 'PATCH':
+                $request = $parameters;
+                $query = array();
+                break;
+            default:
+                $request = array();
+                $query = $parameters;
+                break;
+        }
+
+        $queryString = '';
+        if (isset($components['query'])) {
+            parse_str(html_entity_decode($components['query']), $qs);
+
+            if ($query) {
+                $query = array_replace($qs, $query);
+                $queryString = http_build_query($query, '', '&');
+            } else {
+                $query = $qs;
+                $queryString = $components['query'];
+            }
+        } elseif ($query) {
+            $queryString = http_build_query($query, '', '&');
+        }
+
+        $server['REQUEST_URI'] = $components['path'].('' !== $queryString ? '?'.$queryString : '');
+        $server['QUERY_STRING'] = $queryString;
+
+        return self::createRequestFromFactory($query, $request, array(), $cookies, $files, $server, $content);
+    }
+
+    /**
+     * Sets a callable able to create a Request instance.
+     *
+     * This is mainly useful when you need to override the Request class
+     * to keep BC with an existing system. It should not be used for any
+     * other purpose.
+     *
+     * @param callable|null $callable A PHP callable
+     */
+    public static function setFactory($callable)
+    {
+        self::$requestFactory = $callable;
+    }
+
+    /**
+     * Clones a request and overrides some of its parameters.
+     *
+     * @param array $query      The GET parameters
+     * @param array $request    The POST parameters
+     * @param array $attributes The request attributes (parameters parsed from the PATH_INFO, ...)
+     * @param array $cookies    The COOKIE parameters
+     * @param array $files      The FILES parameters
+     * @param array $server     The SERVER parameters
+     *
+     * @return static
+     */
+    public function duplicate(array $query = null, array $request = null, array $attributes = null, array $cookies = null, array $files = null, array $server = null)
+    {
+        $dup = clone $this;
+        if (null !== $query) {
+            $dup->query = new ParameterBag($query);
+        }
+        if (null !== $request) {
+            $dup->request = new ParameterBag($request);
+        }
+        if (null !== $attributes) {
+            $dup->attributes = new ParameterBag($attributes);
+        }
+        if (null !== $cookies) {
+            $dup->cookies = new ParameterBag($cookies);
+        }
+        if (null !== $files) {
+            $dup->files = new FileBag($files);
+        }
+        if (null !== $server) {
+            $dup->server = new ServerBag($server);
+            $dup->headers = new HeaderBag($dup->server->getHeaders());
+        }
+        $dup->languages = null;
+        $dup->charsets = null;
+        $dup->encodings = null;
+        $dup->acceptableContentTypes = null;
+        $dup->pathInfo = null;
+        $dup->requestUri = null;
+        $dup->baseUrl = null;
+        $dup->basePath = null;
+        $dup->method = null;
+        $dup->format = null;
+
+        if (!$dup->get('_format') && $this->get('_format')) {
+            $dup->attributes->set('_format', $this->get('_format'));
+        }
+
+        if (!$dup->getRequestFormat(null)) {
+            $dup->setRequestFormat($this->getRequestFormat(null));
+        }
+
+        return $dup;
+    }
+
+    /**
+     * Clones the current request.
+     *
+     * Note that the session is not cloned as duplicated requests
+     * are most of the time sub-requests of the main one.
+     */
+    public function __clone()
+    {
+        $this->query = clone $this->query;
+        $this->request = clone $this->request;
+        $this->attributes = clone $this->attributes;
+        $this->cookies = clone $this->cookies;
+        $this->files = clone $this->files;
+        $this->server = clone $this->server;
+        $this->headers = clone $this->headers;
+    }
+
+    /**
+     * Returns the request as a string.
+     *
+     * @return string The request
+     */
+    public function __toString()
+    {
+        try {
+            $content = $this->getContent();
+        } catch (\LogicException $e) {
+            return trigger_error($e, E_USER_ERROR);
+        }
+
+        $cookieHeader = '';
+        $cookies = array();
+
+        foreach ($this->cookies as $k => $v) {
+            $cookies[] = $k.'='.$v;
+        }
+
+        if (!empty($cookies)) {
+            $cookieHeader = 'Cookie: '.implode('; ', $cookies)."\r\n";
+        }
+
+        return
+            sprintf('%s %s %s', $this->getMethod(), $this->getRequestUri(), $this->server->get('SERVER_PROTOCOL'))."\r\n".
+            $this->headers.
+            $cookieHeader."\r\n".
+            $content;
+    }
+
+    /**
+     * Overrides the PHP global variables according to this request instance.
+     *
+     * It overrides $_GET, $_POST, $_REQUEST, $_SERVER, $_COOKIE.
+     * $_FILES is never overridden, see rfc1867
+     */
+    public function overrideGlobals()
+    {
+        $this->server->set('QUERY_STRING', static::normalizeQueryString(http_build_query($this->query->all(), '', '&')));
+
+        $_GET = $this->query->all();
+        $_POST = $this->request->all();
+        $_SERVER = $this->server->all();
+        $_COOKIE = $this->cookies->all();
+
+        foreach ($this->headers->all() as $key => $value) {
+            $key = strtoupper(str_replace('-', '_', $key));
+            if (in_array($key, array('CONTENT_TYPE', 'CONTENT_LENGTH'))) {
+                $_SERVER[$key] = implode(', ', $value);
+            } else {
+                $_SERVER['HTTP_'.$key] = implode(', ', $value);
+            }
+        }
+
+        $request = array('g' => $_GET, 'p' => $_POST, 'c' => $_COOKIE);
+
+        $requestOrder = ini_get('request_order') ?: ini_get('variables_order');
+        $requestOrder = preg_replace('#[^cgp]#', '', strtolower($requestOrder)) ?: 'gp';
+
+        $_REQUEST = array();
+        foreach (str_split($requestOrder) as $order) {
+            $_REQUEST = array_merge($_REQUEST, $request[$order]);
+        }
+    }
+
+    /**
+     * Sets a list of trusted proxies.
+     *
+     * You should only list the reverse proxies that you manage directly.
+     *
+     * @param array $proxies          A list of trusted proxies
+     * @param int   $trustedHeaderSet A bit field of Request::HEADER_*, to set which headers to trust from your proxies
+     *
+     * @throws \InvalidArgumentException When $trustedHeaderSet is invalid
+     */
+    public static function setTrustedProxies(array $proxies/*, int $trustedHeaderSet*/)
+    {
+        self::$trustedProxies = $proxies;
+
+        if (2 > func_num_args()) {
+            @trigger_error(sprintf('The %s() method expects a bit field of Request::HEADER_* as second argument since Symfony 3.3. Defining it will be required in 4.0. ', __METHOD__), E_USER_DEPRECATED);
+
+            return;
+        }
+        $trustedHeaderSet = (int) func_get_arg(1);
+
+        foreach (self::$trustedHeaderNames as $header => $name) {
+            self::$trustedHeaders[$header] = $header & $trustedHeaderSet ? $name : null;
+        }
+        self::$trustedHeaderSet = $trustedHeaderSet;
+    }
+
+    /**
+     * Gets the list of trusted proxies.
+     *
+     * @return array An array of trusted proxies
+     */
+    public static function getTrustedProxies()
+    {
+        return self::$trustedProxies;
+    }
+
+    /**
+     * Gets the set of trusted headers from trusted proxies.
+     *
+     * @return int A bit field of Request::HEADER_* that defines which headers are trusted from your proxies
+     */
+    public static function getTrustedHeaderSet()
+    {
+        return self::$trustedHeaderSet;
+    }
+
+    /**
+     * Sets a list of trusted host patterns.
+     *
+     * You should only list the hosts you manage using regexs.
+     *
+     * @param array $hostPatterns A list of trusted host patterns
+     */
+    public static function setTrustedHosts(array $hostPatterns)
+    {
+        self::$trustedHostPatterns = array_map(function ($hostPattern) {
+            return sprintf('#%s#i', $hostPattern);
+        }, $hostPatterns);
+        // we need to reset trusted hosts on trusted host patterns change
+        self::$trustedHosts = array();
+    }
+
+    /**
+     * Gets the list of trusted host patterns.
+     *
+     * @return array An array of trusted host patterns
+     */
+    public static function getTrustedHosts()
+    {
+        return self::$trustedHostPatterns;
+    }
+
+    /**
+     * Sets the name for trusted headers.
+     *
+     * The following header keys are supported:
+     *
+     *  * Request::HEADER_CLIENT_IP:    defaults to X-Forwarded-For   (see getClientIp())
+     *  * Request::HEADER_CLIENT_HOST:  defaults to X-Forwarded-Host  (see getHost())
+     *  * Request::HEADER_CLIENT_PORT:  defaults to X-Forwarded-Port  (see getPort())
+     *  * Request::HEADER_CLIENT_PROTO: defaults to X-Forwarded-Proto (see getScheme() and isSecure())
+     *  * Request::HEADER_FORWARDED:    defaults to Forwarded         (see RFC 7239)
+     *
+     * Setting an empty value allows to disable the trusted header for the given key.
+     *
+     * @param string $key   The header key
+     * @param string $value The header name
+     *
+     * @throws \InvalidArgumentException
+     *
+     * @deprecated since version 3.3, to be removed in 4.0. Use the $trustedHeaderSet argument of the Request::setTrustedProxies() method instead.
+     */
+    public static function setTrustedHeaderName($key, $value)
+    {
+        @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 3.3 and will be removed in 4.0. Use the $trustedHeaderSet argument of the Request::setTrustedProxies() method instead.', __METHOD__), E_USER_DEPRECATED);
+
+        if ('forwarded' === $key) {
+            $key = self::HEADER_FORWARDED;
+        } elseif ('client_ip' === $key) {
+            $key = self::HEADER_CLIENT_IP;
+        } elseif ('client_host' === $key) {
+            $key = self::HEADER_CLIENT_HOST;
+        } elseif ('client_proto' === $key) {
+            $key = self::HEADER_CLIENT_PROTO;
+        } elseif ('client_port' === $key) {
+            $key = self::HEADER_CLIENT_PORT;
+        } elseif (!array_key_exists($key, self::$trustedHeaders)) {
+            throw new \InvalidArgumentException(sprintf('Unable to set the trusted header name for key "%s".', $key));
+        }
+
+        self::$trustedHeaders[$key] = $value;
+
+        if (null !== $value) {
+            self::$trustedHeaderNames[$key] = $value;
+            self::$trustedHeaderSet |= $key;
+        } else {
+            self::$trustedHeaderSet &= ~$key;
+        }
+    }
+
+    /**
+     * Gets the trusted proxy header name.
+     *
+     * @param string $key The header key
+     *
+     * @return string The header name
+     *
+     * @throws \InvalidArgumentException
+     *
+     * @deprecated since version 3.3, to be removed in 4.0. Use the Request::getTrustedHeaderSet() method instead.
+     */
+    public static function getTrustedHeaderName($key)
+    {
+        if (2 > func_num_args() || func_get_arg(1)) {
+            @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 3.3 and will be removed in 4.0. Use the Request::getTrustedHeaderSet() method instead.', __METHOD__), E_USER_DEPRECATED);
+        }
+
+        if (!array_key_exists($key, self::$trustedHeaders)) {
+            throw new \InvalidArgumentException(sprintf('Unable to get the trusted header name for key "%s".', $key));
+        }
+
+        return self::$trustedHeaders[$key];
+    }
+
+    /**
+     * Normalizes a query string.
+     *
+     * It builds a normalized query string, where keys/value pairs are alphabetized,
+     * have consistent escaping and unneeded delimiters are removed.
+     *
+     * @param string $qs Query string
+     *
+     * @return string A normalized query string for the Request
+     */
+    public static function normalizeQueryString($qs)
+    {
+        if ('' == $qs) {
+            return '';
+        }
+
+        $parts = array();
+        $order = array();
+
+        foreach (explode('&', $qs) as $param) {
+            if ('' === $param || '=' === $param[0]) {
+                // Ignore useless delimiters, e.g. "x=y&".
+                // Also ignore pairs with empty key, even if there was a value, e.g. "=value", as such nameless values cannot be retrieved anyway.
+                // PHP also does not include them when building _GET.
+                continue;
+            }
+
+            $keyValuePair = explode('=', $param, 2);
+
+            // GET parameters, that are submitted from a HTML form, encode spaces as "+" by default (as defined in enctype application/x-www-form-urlencoded).
+            // PHP also converts "+" to spaces when filling the global _GET or when using the function parse_str. This is why we use urldecode and then normalize to
+            // RFC 3986 with rawurlencode.
+            $parts[] = isset($keyValuePair[1]) ?
+                rawurlencode(urldecode($keyValuePair[0])).'='.rawurlencode(urldecode($keyValuePair[1])) :
+                rawurlencode(urldecode($keyValuePair[0]));
+            $order[] = urldecode($keyValuePair[0]);
+        }
+
+        array_multisort($order, SORT_ASC, $parts);
+
+        return implode('&', $parts);
+    }
+
+    /**
+     * Enables support for the _method request parameter to determine the intended HTTP method.
+     *
+     * Be warned that enabling this feature might lead to CSRF issues in your code.
+     * Check that you are using CSRF tokens when required.
+     * If the HTTP method parameter override is enabled, an html-form with method "POST" can be altered
+     * and used to send a "PUT" or "DELETE" request via the _method request parameter.
+     * If these methods are not protected against CSRF, this presents a possible vulnerability.
+     *
+     * The HTTP method can only be overridden when the real HTTP method is POST.
+     */
+    public static function enableHttpMethodParameterOverride()
+    {
+        self::$httpMethodParameterOverride = true;
+    }
+
+    /**
+     * Checks whether support for the _method request parameter is enabled.
+     *
+     * @return bool True when the _method request parameter is enabled, false otherwise
+     */
+    public static function getHttpMethodParameterOverride()
+    {
+        return self::$httpMethodParameterOverride;
+    }
+
+    /**
+     * Gets a "parameter" value from any bag.
+     *
+     * This method is mainly useful for libraries that want to provide some flexibility. If you don't need the
+     * flexibility in controllers, it is better to explicitly get request parameters from the appropriate
+     * public property instead (attributes, query, request).
+     *
+     * Order of precedence: PATH (routing placeholders or custom attributes), GET, BODY
+     *
+     * @param string $key     The key
+     * @param mixed  $default The default value if the parameter key does not exist
+     *
+     * @return mixed
+     */
+    public function get($key, $default = null)
+    {
+        if ($this !== $result = $this->attributes->get($key, $this)) {
+            return $result;
+        }
+
+        if ($this !== $result = $this->query->get($key, $this)) {
+            return $result;
+        }
+
+        if ($this !== $result = $this->request->get($key, $this)) {
+            return $result;
+        }
+
+        return $default;
+    }
+
+    /**
+     * Gets the Session.
+     *
+     * @return SessionInterface|null The session
+     */
+    public function getSession()
+    {
+        return $this->session;
+    }
+
+    /**
+     * Whether the request contains a Session which was started in one of the
+     * previous requests.
+     *
+     * @return bool
+     */
+    public function hasPreviousSession()
+    {
+        // the check for $this->session avoids malicious users trying to fake a session cookie with proper name
+        return $this->hasSession() && $this->cookies->has($this->session->getName());
+    }
+
+    /**
+     * Whether the request contains a Session object.
+     *
+     * This method does not give any information about the state of the session object,
+     * like whether the session is started or not. It is just a way to check if this Request
+     * is associated with a Session instance.
+     *
+     * @return bool true when the Request contains a Session object, false otherwise
+     */
+    public function hasSession()
+    {
+        return null !== $this->session;
+    }
+
+    /**
+     * Sets the Session.
+     *
+     * @param SessionInterface $session The Session
+     */
+    public function setSession(SessionInterface $session)
+    {
+        $this->session = $session;
+    }
+
+    /**
+     * Returns the client IP addresses.
+     *
+     * In the returned array the most trusted IP address is first, and the
+     * least trusted one last. The "real" client IP address is the last one,
+     * but this is also the least trusted one. Trusted proxies are stripped.
+     *
+     * Use this method carefully; you should use getClientIp() instead.
+     *
+     * @return array The client IP addresses
+     *
+     * @see getClientIp()
+     */
+    public function getClientIps()
+    {
+        $ip = $this->server->get('REMOTE_ADDR');
+
+        if (!$this->isFromTrustedProxy()) {
+            return array($ip);
+        }
+
+        return $this->getTrustedValues(self::HEADER_CLIENT_IP, $ip) ?: array($ip);
+    }
+
+    /**
+     * Returns the client IP address.
+     *
+     * This method can read the client IP address from the "X-Forwarded-For" header
+     * when trusted proxies were set via "setTrustedProxies()". The "X-Forwarded-For"
+     * header value is a comma+space separated list of IP addresses, the left-most
+     * being the original client, and each successive proxy that passed the request
+     * adding the IP address where it received the request from.
+     *
+     * If your reverse proxy uses a different header name than "X-Forwarded-For",
+     * ("Client-Ip" for instance), configure it via the $trustedHeaderSet
+     * argument of the Request::setTrustedProxies() method instead.
+     *
+     * @return string|null The client IP address
+     *
+     * @see getClientIps()
+     * @see http://en.wikipedia.org/wiki/X-Forwarded-For
+     */
+    public function getClientIp()
+    {
+        $ipAddresses = $this->getClientIps();
+
+        return $ipAddresses[0];
+    }
+
+    /**
+     * Returns current script name.
+     *
+     * @return string
+     */
+    public function getScriptName()
+    {
+        return $this->server->get('SCRIPT_NAME', $this->server->get('ORIG_SCRIPT_NAME', ''));
+    }
+
+    /**
+     * Returns the path being requested relative to the executed script.
+     *
+     * The path info always starts with a /.
+     *
+     * Suppose this request is instantiated from /mysite on localhost:
+     *
+     *  * http://localhost/mysite              returns an empty string
+     *  * http://localhost/mysite/about        returns '/about'
+     *  * http://localhost/mysite/enco%20ded   returns '/enco%20ded'
+     *  * http://localhost/mysite/about?var=1  returns '/about'
+     *
+     * @return string The raw path (i.e. not urldecoded)
+     */
+    public function getPathInfo()
+    {
+        if (null === $this->pathInfo) {
+            $this->pathInfo = $this->preparePathInfo();
+        }
+
+        return $this->pathInfo;
+    }
+
+    /**
+     * Returns the root path from which this request is executed.
+     *
+     * Suppose that an index.php file instantiates this request object:
+     *
+     *  * http://localhost/index.php         returns an empty string
+     *  * http://localhost/index.php/page    returns an empty string
+     *  * http://localhost/web/index.php     returns '/web'
+     *  * http://localhost/we%20b/index.php  returns '/we%20b'
+     *
+     * @return string The raw path (i.e. not urldecoded)
+     */
+    public function getBasePath()
+    {
+        if (null === $this->basePath) {
+            $this->basePath = $this->prepareBasePath();
+        }
+
+        return $this->basePath;
+    }
+
+    /**
+     * Returns the root URL from which this request is executed.
+     *
+     * The base URL never ends with a /.
+     *
+     * This is similar to getBasePath(), except that it also includes the
+     * script filename (e.g. index.php) if one exists.
+     *
+     * @return string The raw URL (i.e. not urldecoded)
+     */
+    public function getBaseUrl()
+    {
+        if (null === $this->baseUrl) {
+            $this->baseUrl = $this->prepareBaseUrl();
+        }
+
+        return $this->baseUrl;
+    }
+
+    /**
+     * Gets the request's scheme.
+     *
+     * @return string
+     */
+    public function getScheme()
+    {
+        return $this->isSecure() ? 'https' : 'http';
+    }
+
+    /**
+     * Returns the port on which the request is made.
+     *
+     * This method can read the client port from the "X-Forwarded-Port" header
+     * when trusted proxies were set via "setTrustedProxies()".
+     *
+     * The "X-Forwarded-Port" header must contain the client port.
+     *
+     * If your reverse proxy uses a different header name than "X-Forwarded-Port",
+     * configure it via via the $trustedHeaderSet argument of the
+     * Request::setTrustedProxies() method instead.
+     *
+     * @return int|string can be a string if fetched from the server bag
+     */
+    public function getPort()
+    {
+        if ($this->isFromTrustedProxy() && $host = $this->getTrustedValues(self::HEADER_CLIENT_PORT)) {
+            $host = $host[0];
+        } elseif ($this->isFromTrustedProxy() && $host = $this->getTrustedValues(self::HEADER_CLIENT_HOST)) {
+            $host = $host[0];
+        } elseif (!$host = $this->headers->get('HOST')) {
+            return $this->server->get('SERVER_PORT');
+        }
+
+        if ('[' === $host[0]) {
+            $pos = strpos($host, ':', strrpos($host, ']'));
+        } else {
+            $pos = strrpos($host, ':');
+        }
+
+        if (false !== $pos) {
+            return (int) substr($host, $pos + 1);
+        }
+
+        return 'https' === $this->getScheme() ? 443 : 80;
+    }
+
+    /**
+     * Returns the user.
+     *
+     * @return string|null
+     */
+    public function getUser()
+    {
+        return $this->headers->get('PHP_AUTH_USER');
+    }
+
+    /**
+     * Returns the password.
+     *
+     * @return string|null
+     */
+    public function getPassword()
+    {
+        return $this->headers->get('PHP_AUTH_PW');
+    }
+
+    /**
+     * Gets the user info.
+     *
+     * @return string A user name and, optionally, scheme-specific information about how to gain authorization to access the server
+     */
+    public function getUserInfo()
+    {
+        $userinfo = $this->getUser();
+
+        $pass = $this->getPassword();
+        if ('' != $pass) {
+            $userinfo .= ":$pass";
+        }
+
+        return $userinfo;
+    }
+
+    /**
+     * Returns the HTTP host being requested.
+     *
+     * The port name will be appended to the host if it's non-standard.
+     *
+     * @return string
+     */
+    public function getHttpHost()
+    {
+        $scheme = $this->getScheme();
+        $port = $this->getPort();
+
+        if (('http' == $scheme && 80 == $port) || ('https' == $scheme && 443 == $port)) {
+            return $this->getHost();
+        }
+
+        return $this->getHost().':'.$port;
+    }
+
+    /**
+     * Returns the requested URI (path and query string).
+     *
+     * @return string The raw URI (i.e. not URI decoded)
+     */
+    public function getRequestUri()
+    {
+        if (null === $this->requestUri) {
+            $this->requestUri = $this->prepareRequestUri();
+        }
+
+        return $this->requestUri;
+    }
+
+    /**
+     * Gets the scheme and HTTP host.
+     *
+     * If the URL was called with basic authentication, the user
+     * and the password are not added to the generated string.
+     *
+     * @return string The scheme and HTTP host
+     */
+    public function getSchemeAndHttpHost()
+    {
+        return $this->getScheme().'://'.$this->getHttpHost();
+    }
+
+    /**
+     * Generates a normalized URI (URL) for the Request.
+     *
+     * @return string A normalized URI (URL) for the Request
+     *
+     * @see getQueryString()
+     */
+    public function getUri()
+    {
+        if (null !== $qs = $this->getQueryString()) {
+            $qs = '?'.$qs;
+        }
+
+        return $this->getSchemeAndHttpHost().$this->getBaseUrl().$this->getPathInfo().$qs;
+    }
+
+    /**
+     * Generates a normalized URI for the given path.
+     *
+     * @param string $path A path to use instead of the current one
+     *
+     * @return string The normalized URI for the path
+     */
+    public function getUriForPath($path)
+    {
+        return $this->getSchemeAndHttpHost().$this->getBaseUrl().$path;
+    }
+
+    /**
+     * Returns the path as relative reference from the current Request path.
+     *
+     * Only the URIs path component (no schema, host etc.) is relevant and must be given.
+     * Both paths must be absolute and not contain relative parts.
+     * Relative URLs from one resource to another are useful when generating self-contained downloadable document archives.
+     * Furthermore, they can be used to reduce the link size in documents.
+     *
+     * Example target paths, given a base path of "/a/b/c/d":
+     * - "/a/b/c/d"     -> ""
+     * - "/a/b/c/"      -> "./"
+     * - "/a/b/"        -> "../"
+     * - "/a/b/c/other" -> "other"
+     * - "/a/x/y"       -> "../../x/y"
+     *
+     * @param string $path The target path
+     *
+     * @return string The relative target path
+     */
+    public function getRelativeUriForPath($path)
+    {
+        // be sure that we are dealing with an absolute path
+        if (!isset($path[0]) || '/' !== $path[0]) {
+            return $path;
+        }
+
+        if ($path === $basePath = $this->getPathInfo()) {
+            return '';
+        }
+
+        $sourceDirs = explode('/', isset($basePath[0]) && '/' === $basePath[0] ? substr($basePath, 1) : $basePath);
+        $targetDirs = explode('/', isset($path[0]) && '/' === $path[0] ? substr($path, 1) : $path);
+        array_pop($sourceDirs);
+        $targetFile = array_pop($targetDirs);
+
+        foreach ($sourceDirs as $i => $dir) {
+            if (isset($targetDirs[$i]) && $dir === $targetDirs[$i]) {
+                unset($sourceDirs[$i], $targetDirs[$i]);
+            } else {
+                break;
+            }
+        }
+
+        $targetDirs[] = $targetFile;
+        $path = str_repeat('../', count($sourceDirs)).implode('/', $targetDirs);
+
+        // A reference to the same base directory or an empty subdirectory must be prefixed with "./".
+        // This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used
+        // as the first segment of a relative-path reference, as it would be mistaken for a scheme name
+        // (see http://tools.ietf.org/html/rfc3986#section-4.2).
+        return !isset($path[0]) || '/' === $path[0]
+            || false !== ($colonPos = strpos($path, ':')) && ($colonPos < ($slashPos = strpos($path, '/')) || false === $slashPos)
+            ? "./$path" : $path;
+    }
+
+    /**
+     * Generates the normalized query string for the Request.
+     *
+     * It builds a normalized query string, where keys/value pairs are alphabetized
+     * and have consistent escaping.
+     *
+     * @return string|null A normalized query string for the Request
+     */
+    public function getQueryString()
+    {
+        $qs = static::normalizeQueryString($this->server->get('QUERY_STRING'));
+
+        return '' === $qs ? null : $qs;
+    }
+
+    /**
+     * Checks whether the request is secure or not.
+     *
+     * This method can read the client protocol from the "X-Forwarded-Proto" header
+     * when trusted proxies were set via "setTrustedProxies()".
+     *
+     * The "X-Forwarded-Proto" header must contain the protocol: "https" or "http".
+     *
+     * If your reverse proxy uses a different header name than "X-Forwarded-Proto"
+     * ("SSL_HTTPS" for instance), configure it via the $trustedHeaderSet
+     * argument of the Request::setTrustedProxies() method instead.
+     *
+     * @return bool
+     */
+    public function isSecure()
+    {
+        if ($this->isFromTrustedProxy() && $proto = $this->getTrustedValues(self::HEADER_CLIENT_PROTO)) {
+            return in_array(strtolower($proto[0]), array('https', 'on', 'ssl', '1'), true);
+        }
+
+        $https = $this->server->get('HTTPS');
+
+        return !empty($https) && 'off' !== strtolower($https);
+    }
+
+    /**
+     * Returns the host name.
+     *
+     * This method can read the client host name from the "X-Forwarded-Host" header
+     * when trusted proxies were set via "setTrustedProxies()".
+     *
+     * The "X-Forwarded-Host" header must contain the client host name.
+     *
+     * If your reverse proxy uses a different header name than "X-Forwarded-Host",
+     * configure it via the $trustedHeaderSet argument of the
+     * Request::setTrustedProxies() method instead.
+     *
+     * @return string
+     *
+     * @throws SuspiciousOperationException when the host name is invalid or not trusted
+     */
+    public function getHost()
+    {
+        if ($this->isFromTrustedProxy() && $host = $this->getTrustedValues(self::HEADER_CLIENT_HOST)) {
+            $host = $host[0];
+        } elseif (!$host = $this->headers->get('HOST')) {
+            if (!$host = $this->server->get('SERVER_NAME')) {
+                $host = $this->server->get('SERVER_ADDR', '');
+            }
+        }
+
+        // trim and remove port number from host
+        // host is lowercase as per RFC 952/2181
+        $host = strtolower(preg_replace('/:\d+$/', '', trim($host)));
+
+        // as the host can come from the user (HTTP_HOST and depending on the configuration, SERVER_NAME too can come from the user)
+        // check that it does not contain forbidden characters (see RFC 952 and RFC 2181)
+        // use preg_replace() instead of preg_match() to prevent DoS attacks with long host names
+        if ($host && '' !== preg_replace('/(?:^\[)?[a-zA-Z0-9-:\]_]+\.?/', '', $host)) {
+            if (!$this->isHostValid) {
+                return '';
+            }
+            $this->isHostValid = false;
+
+            throw new SuspiciousOperationException(sprintf('Invalid Host "%s".', $host));
+        }
+
+        if (count(self::$trustedHostPatterns) > 0) {
+            // to avoid host header injection attacks, you should provide a list of trusted host patterns
+
+            if (in_array($host, self::$trustedHosts)) {
+                return $host;
+            }
+
+            foreach (self::$trustedHostPatterns as $pattern) {
+                if (preg_match($pattern, $host)) {
+                    self::$trustedHosts[] = $host;
+
+                    return $host;
+                }
+            }
+
+            if (!$this->isHostValid) {
+                return '';
+            }
+            $this->isHostValid = false;
+
+            throw new SuspiciousOperationException(sprintf('Untrusted Host "%s".', $host));
+        }
+
+        return $host;
+    }
+
+    /**
+     * Sets the request method.
+     *
+     * @param string $method
+     */
+    public function setMethod($method)
+    {
+        $this->method = null;
+        $this->server->set('REQUEST_METHOD', $method);
+    }
+
+    /**
+     * Gets the request "intended" method.
+     *
+     * If the X-HTTP-Method-Override header is set, and if the method is a POST,
+     * then it is used to determine the "real" intended HTTP method.
+     *
+     * The _method request parameter can also be used to determine the HTTP method,
+     * but only if enableHttpMethodParameterOverride() has been called.
+     *
+     * The method is always an uppercased string.
+     *
+     * @return string The request method
+     *
+     * @see getRealMethod()
+     */
+    public function getMethod()
+    {
+        if (null === $this->method) {
+            $this->method = strtoupper($this->server->get('REQUEST_METHOD', 'GET'));
+
+            if ('POST' === $this->method) {
+                if ($method = $this->headers->get('X-HTTP-METHOD-OVERRIDE')) {
+                    $this->method = strtoupper($method);
+                } elseif (self::$httpMethodParameterOverride) {
+                    $this->method = strtoupper($this->request->get('_method', $this->query->get('_method', 'POST')));
+                }
+            }
+        }
+
+        return $this->method;
+    }
+
+    /**
+     * Gets the "real" request method.
+     *
+     * @return string The request method
+     *
+     * @see getMethod()
+     */
+    public function getRealMethod()
+    {
+        return strtoupper($this->server->get('REQUEST_METHOD', 'GET'));
+    }
+
+    /**
+     * Gets the mime type associated with the format.
+     *
+     * @param string $format The format
+     *
+     * @return string The associated mime type (null if not found)
+     */
+    public function getMimeType($format)
+    {
+        if (null === static::$formats) {
+            static::initializeFormats();
+        }
+
+        return isset(static::$formats[$format]) ? static::$formats[$format][0] : null;
+    }
+
+    /**
+     * Gets the mime types associated with the format.
+     *
+     * @param string $format The format
+     *
+     * @return array The associated mime types
+     */
+    public static function getMimeTypes($format)
+    {
+        if (null === static::$formats) {
+            static::initializeFormats();
+        }
+
+        return isset(static::$formats[$format]) ? static::$formats[$format] : array();
+    }
+
+    /**
+     * Gets the format associated with the mime type.
+     *
+     * @param string $mimeType The associated mime type
+     *
+     * @return string|null The format (null if not found)
+     */
+    public function getFormat($mimeType)
+    {
+        $canonicalMimeType = null;
+        if (false !== $pos = strpos($mimeType, ';')) {
+            $canonicalMimeType = substr($mimeType, 0, $pos);
+        }
+
+        if (null === static::$formats) {
+            static::initializeFormats();
+        }
+
+        foreach (static::$formats as $format => $mimeTypes) {
+            if (in_array($mimeType, (array) $mimeTypes)) {
+                return $format;
+            }
+            if (null !== $canonicalMimeType && in_array($canonicalMimeType, (array) $mimeTypes)) {
+                return $format;
+            }
+        }
+    }
+
+    /**
+     * Associates a format with mime types.
+     *
+     * @param string       $format    The format
+     * @param string|array $mimeTypes The associated mime types (the preferred one must be the first as it will be used as the content type)
+     */
+    public function setFormat($format, $mimeTypes)
+    {
+        if (null === static::$formats) {
+            static::initializeFormats();
+        }
+
+        static::$formats[$format] = is_array($mimeTypes) ? $mimeTypes : array($mimeTypes);
+    }
+
+    /**
+     * Gets the request format.
+     *
+     * Here is the process to determine the format:
+     *
+     *  * format defined by the user (with setRequestFormat())
+     *  * _format request attribute
+     *  * $default
+     *
+     * @param string $default The default format
+     *
+     * @return string The request format
+     */
+    public function getRequestFormat($default = 'html')
+    {
+        if (null === $this->format) {
+            $this->format = $this->attributes->get('_format');
+        }
+
+        return null === $this->format ? $default : $this->format;
+    }
+
+    /**
+     * Sets the request format.
+     *
+     * @param string $format The request format
+     */
+    public function setRequestFormat($format)
+    {
+        $this->format = $format;
+    }
+
+    /**
+     * Gets the format associated with the request.
+     *
+     * @return string|null The format (null if no content type is present)
+     */
+    public function getContentType()
+    {
+        return $this->getFormat($this->headers->get('CONTENT_TYPE'));
+    }
+
+    /**
+     * Sets the default locale.
+     *
+     * @param string $locale
+     */
+    public function setDefaultLocale($locale)
+    {
+        $this->defaultLocale = $locale;
+
+        if (null === $this->locale) {
+            $this->setPhpDefaultLocale($locale);
+        }
+    }
+
+    /**
+     * Get the default locale.
+     *
+     * @return string
+     */
+    public function getDefaultLocale()
+    {
+        return $this->defaultLocale;
+    }
+
+    /**
+     * Sets the locale.
+     *
+     * @param string $locale
+     */
+    public function setLocale($locale)
+    {
+        $this->setPhpDefaultLocale($this->locale = $locale);
+    }
+
+    /**
+     * Get the locale.
+     *
+     * @return string
+     */
+    public function getLocale()
+    {
+        return null === $this->locale ? $this->defaultLocale : $this->locale;
+    }
+
+    /**
+     * Checks if the request method is of specified type.
+     *
+     * @param string $method Uppercase request method (GET, POST etc)
+     *
+     * @return bool
+     */
+    public function isMethod($method)
+    {
+        return $this->getMethod() === strtoupper($method);
+    }
+
+    /**
+     * Checks whether or not the method is safe.
+     *
+     * @see https://tools.ietf.org/html/rfc7231#section-4.2.1
+     *
+     * @param bool $andCacheable Adds the additional condition that the method should be cacheable. True by default.
+     *
+     * @return bool
+     */
+    public function isMethodSafe(/* $andCacheable = true */)
+    {
+        if (!func_num_args() || func_get_arg(0)) {
+            // This deprecation should be turned into a BadMethodCallException in 4.0 (without adding the argument in the signature)
+            // then setting $andCacheable to false should be deprecated in 4.1
+            @trigger_error('Checking only for cacheable HTTP methods with Symfony\Component\HttpFoundation\Request::isMethodSafe() is deprecated since Symfony 3.2 and will throw an exception in 4.0. Disable checking only for cacheable methods by calling the method with `false` as first argument or use the Request::isMethodCacheable() instead.', E_USER_DEPRECATED);
+
+            return in_array($this->getMethod(), array('GET', 'HEAD'));
+        }
+
+        return in_array($this->getMethod(), array('GET', 'HEAD', 'OPTIONS', 'TRACE'));
+    }
+
+    /**
+     * Checks whether or not the method is idempotent.
+     *
+     * @return bool
+     */
+    public function isMethodIdempotent()
+    {
+        return in_array($this->getMethod(), array('HEAD', 'GET', 'PUT', 'DELETE', 'TRACE', 'OPTIONS', 'PURGE'));
+    }
+
+    /**
+     * Checks whether the method is cacheable or not.
+     *
+     * @see https://tools.ietf.org/html/rfc7231#section-4.2.3
+     *
+     * @return bool
+     */
+    public function isMethodCacheable()
+    {
+        return in_array($this->getMethod(), array('GET', 'HEAD'));
+    }
+
+    /**
+     * Returns the protocol version.
+     *
+     * If the application is behind a proxy, the protocol version used in the
+     * requests between the client and the proxy and between the proxy and the
+     * server might be different. This returns the former (from the "Via" header)
+     * if the proxy is trusted (see "setTrustedProxies()"), otherwise it returns
+     * the latter (from the "SERVER_PROTOCOL" server parameter).
+     *
+     * @return string
+     */
+    public function getProtocolVersion()
+    {
+        if ($this->isFromTrustedProxy()) {
+            preg_match('~^(HTTP/)?([1-9]\.[0-9]) ~', $this->headers->get('Via'), $matches);
+
+            if ($matches) {
+                return 'HTTP/'.$matches[2];
+            }
+        }
+
+        return $this->server->get('SERVER_PROTOCOL');
+    }
+
+    /**
+     * Returns the request body content.
+     *
+     * @param bool $asResource If true, a resource will be returned
+     *
+     * @return string|resource The request body content or a resource to read the body stream
+     *
+     * @throws \LogicException
+     */
+    public function getContent($asResource = false)
+    {
+        $currentContentIsResource = is_resource($this->content);
+        if (\PHP_VERSION_ID < 50600 && false === $this->content) {
+            throw new \LogicException('getContent() can only be called once when using the resource return type and PHP below 5.6.');
+        }
+
+        if (true === $asResource) {
+            if ($currentContentIsResource) {
+                rewind($this->content);
+
+                return $this->content;
+            }
+
+            // Content passed in parameter (test)
+            if (is_string($this->content)) {
+                $resource = fopen('php://temp', 'r+');
+                fwrite($resource, $this->content);
+                rewind($resource);
+
+                return $resource;
+            }
+
+            $this->content = false;
+
+            return fopen('php://input', 'rb');
+        }
+
+        if ($currentContentIsResource) {
+            rewind($this->content);
+
+            return stream_get_contents($this->content);
+        }
+
+        if (null === $this->content || false === $this->content) {
+            $this->content = file_get_contents('php://input');
+        }
+
+        return $this->content;
+    }
+
+    /**
+     * Gets the Etags.
+     *
+     * @return array The entity tags
+     */
+    public function getETags()
+    {
+        return preg_split('/\s*,\s*/', $this->headers->get('if_none_match'), null, PREG_SPLIT_NO_EMPTY);
+    }
+
+    /**
+     * @return bool
+     */
+    public function isNoCache()
+    {
+        return $this->headers->hasCacheControlDirective('no-cache') || 'no-cache' == $this->headers->get('Pragma');
+    }
+
+    /**
+     * Returns the preferred language.
+     *
+     * @param array $locales An array of ordered available locales
+     *
+     * @return string|null The preferred locale
+     */
+    public function getPreferredLanguage(array $locales = null)
+    {
+        $preferredLanguages = $this->getLanguages();
+
+        if (empty($locales)) {
+            return isset($preferredLanguages[0]) ? $preferredLanguages[0] : null;
+        }
+
+        if (!$preferredLanguages) {
+            return $locales[0];
+        }
+
+        $extendedPreferredLanguages = array();
+        foreach ($preferredLanguages as $language) {
+            $extendedPreferredLanguages[] = $language;
+            if (false !== $position = strpos($language, '_')) {
+                $superLanguage = substr($language, 0, $position);
+                if (!in_array($superLanguage, $preferredLanguages)) {
+                    $extendedPreferredLanguages[] = $superLanguage;
+                }
+            }
+        }
+
+        $preferredLanguages = array_values(array_intersect($extendedPreferredLanguages, $locales));
+
+        return isset($preferredLanguages[0]) ? $preferredLanguages[0] : $locales[0];
+    }
+
+    /**
+     * Gets a list of languages acceptable by the client browser.
+     *
+     * @return array Languages ordered in the user browser preferences
+     */
+    public function getLanguages()
+    {
+        if (null !== $this->languages) {
+            return $this->languages;
+        }
+
+        $languages = AcceptHeader::fromString($this->headers->get('Accept-Language'))->all();
+        $this->languages = array();
+        foreach ($languages as $lang => $acceptHeaderItem) {
+            if (false !== strpos($lang, '-')) {
+                $codes = explode('-', $lang);
+                if ('i' === $codes[0]) {
+                    // Language not listed in ISO 639 that are not variants
+                    // of any listed language, which can be registered with the
+                    // i-prefix, such as i-cherokee
+                    if (count($codes) > 1) {
+                        $lang = $codes[1];
+                    }
+                } else {
+                    for ($i = 0, $max = count($codes); $i < $max; ++$i) {
+                        if (0 === $i) {
+                            $lang = strtolower($codes[0]);
+                        } else {
+                            $lang .= '_'.strtoupper($codes[$i]);
+                        }
+                    }
+                }
+            }
+
+            $this->languages[] = $lang;
+        }
+
+        return $this->languages;
+    }
+
+    /**
+     * Gets a list of charsets acceptable by the client browser.
+     *
+     * @return array List of charsets in preferable order
+     */
+    public function getCharsets()
+    {
+        if (null !== $this->charsets) {
+            return $this->charsets;
+        }
+
+        return $this->charsets = array_keys(AcceptHeader::fromString($this->headers->get('Accept-Charset'))->all());
+    }
+
+    /**
+     * Gets a list of encodings acceptable by the client browser.
+     *
+     * @return array List of encodings in preferable order
+     */
+    public function getEncodings()
+    {
+        if (null !== $this->encodings) {
+            return $this->encodings;
+        }
+
+        return $this->encodings = array_keys(AcceptHeader::fromString($this->headers->get('Accept-Encoding'))->all());
+    }
+
+    /**
+     * Gets a list of content types acceptable by the client browser.
+     *
+     * @return array List of content types in preferable order
+     */
+    public function getAcceptableContentTypes()
+    {
+        if (null !== $this->acceptableContentTypes) {
+            return $this->acceptableContentTypes;
+        }
+
+        return $this->acceptableContentTypes = array_keys(AcceptHeader::fromString($this->headers->get('Accept'))->all());
+    }
+
+    /**
+     * Returns true if the request is a XMLHttpRequest.
+     *
+     * It works if your JavaScript library sets an X-Requested-With HTTP header.
+     * It is known to work with common JavaScript frameworks:
+     *
+     * @see http://en.wikipedia.org/wiki/List_of_Ajax_frameworks#JavaScript
+     *
+     * @return bool true if the request is an XMLHttpRequest, false otherwise
+     */
+    public function isXmlHttpRequest()
+    {
+        return 'XMLHttpRequest' == $this->headers->get('X-Requested-With');
+    }
+
+    /*
+     * The following methods are derived from code of the Zend Framework (1.10dev - 2010-01-24)
+     *
+     * Code subject to the new BSD license (http://framework.zend.com/license/new-bsd).
+     *
+     * Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+     */
+
+    protected function prepareRequestUri()
+    {
+        $requestUri = '';
+
+        if ($this->headers->has('X_ORIGINAL_URL')) {
+            // IIS with Microsoft Rewrite Module
+            $requestUri = $this->headers->get('X_ORIGINAL_URL');
+            $this->headers->remove('X_ORIGINAL_URL');
+            $this->server->remove('HTTP_X_ORIGINAL_URL');
+            $this->server->remove('UNENCODED_URL');
+            $this->server->remove('IIS_WasUrlRewritten');
+        } elseif ($this->headers->has('X_REWRITE_URL')) {
+            // IIS with ISAPI_Rewrite
+            $requestUri = $this->headers->get('X_REWRITE_URL');
+            $this->headers->remove('X_REWRITE_URL');
+        } elseif ('1' == $this->server->get('IIS_WasUrlRewritten') && '' != $this->server->get('UNENCODED_URL')) {
+            // IIS7 with URL Rewrite: make sure we get the unencoded URL (double slash problem)
+            $requestUri = $this->server->get('UNENCODED_URL');
+            $this->server->remove('UNENCODED_URL');
+            $this->server->remove('IIS_WasUrlRewritten');
+        } elseif ($this->server->has('REQUEST_URI')) {
+            $requestUri = $this->server->get('REQUEST_URI');
+            // HTTP proxy reqs setup request URI with scheme and host [and port] + the URL path, only use URL path
+            $schemeAndHttpHost = $this->getSchemeAndHttpHost();
+            if (0 === strpos($requestUri, $schemeAndHttpHost)) {
+                $requestUri = substr($requestUri, strlen($schemeAndHttpHost));
+            }
+        } elseif ($this->server->has('ORIG_PATH_INFO')) {
+            // IIS 5.0, PHP as CGI
+            $requestUri = $this->server->get('ORIG_PATH_INFO');
+            if ('' != $this->server->get('QUERY_STRING')) {
+                $requestUri .= '?'.$this->server->get('QUERY_STRING');
+            }
+            $this->server->remove('ORIG_PATH_INFO');
+        }
+
+        // normalize the request URI to ease creating sub-requests from this request
+        $this->server->set('REQUEST_URI', $requestUri);
+
+        return $requestUri;
+    }
+
+    /**
+     * Prepares the base URL.
+     *
+     * @return string
+     */
+    protected function prepareBaseUrl()
+    {
+        $filename = basename($this->server->get('SCRIPT_FILENAME'));
+
+        if (basename($this->server->get('SCRIPT_NAME')) === $filename) {
+            $baseUrl = $this->server->get('SCRIPT_NAME');
+        } elseif (basename($this->server->get('PHP_SELF')) === $filename) {
+            $baseUrl = $this->server->get('PHP_SELF');
+        } elseif (basename($this->server->get('ORIG_SCRIPT_NAME')) === $filename) {
+            $baseUrl = $this->server->get('ORIG_SCRIPT_NAME'); // 1and1 shared hosting compatibility
+        } else {
+            // Backtrack up the script_filename to find the portion matching
+            // php_self
+            $path = $this->server->get('PHP_SELF', '');
+            $file = $this->server->get('SCRIPT_FILENAME', '');
+            $segs = explode('/', trim($file, '/'));
+            $segs = array_reverse($segs);
+            $index = 0;
+            $last = count($segs);
+            $baseUrl = '';
+            do {
+                $seg = $segs[$index];
+                $baseUrl = '/'.$seg.$baseUrl;
+                ++$index;
+            } while ($last > $index && (false !== $pos = strpos($path, $baseUrl)) && 0 != $pos);
+        }
+
+        // Does the baseUrl have anything in common with the request_uri?
+        $requestUri = $this->getRequestUri();
+        if ('' !== $requestUri && '/' !== $requestUri[0]) {
+            $requestUri = '/'.$requestUri;
+        }
+
+        if ($baseUrl && false !== $prefix = $this->getUrlencodedPrefix($requestUri, $baseUrl)) {
+            // full $baseUrl matches
+            return $prefix;
+        }
+
+        if ($baseUrl && false !== $prefix = $this->getUrlencodedPrefix($requestUri, rtrim(dirname($baseUrl), '/'.DIRECTORY_SEPARATOR).'/')) {
+            // directory portion of $baseUrl matches
+            return rtrim($prefix, '/'.DIRECTORY_SEPARATOR);
+        }
+
+        $truncatedRequestUri = $requestUri;
+        if (false !== $pos = strpos($requestUri, '?')) {
+            $truncatedRequestUri = substr($requestUri, 0, $pos);
+        }
+
+        $basename = basename($baseUrl);
+        if (empty($basename) || !strpos(rawurldecode($truncatedRequestUri), $basename)) {
+            // no match whatsoever; set it blank
+            return '';
+        }
+
+        // If using mod_rewrite or ISAPI_Rewrite strip the script filename
+        // out of baseUrl. $pos !== 0 makes sure it is not matching a value
+        // from PATH_INFO or QUERY_STRING
+        if (strlen($requestUri) >= strlen($baseUrl) && (false !== $pos = strpos($requestUri, $baseUrl)) && 0 !== $pos) {
+            $baseUrl = substr($requestUri, 0, $pos + strlen($baseUrl));
+        }
+
+        return rtrim($baseUrl, '/'.DIRECTORY_SEPARATOR);
+    }
+
+    /**
+     * Prepares the base path.
+     *
+     * @return string base path
+     */
+    protected function prepareBasePath()
+    {
+        $baseUrl = $this->getBaseUrl();
+        if (empty($baseUrl)) {
+            return '';
+        }
+
+        $filename = basename($this->server->get('SCRIPT_FILENAME'));
+        if (basename($baseUrl) === $filename) {
+            $basePath = dirname($baseUrl);
+        } else {
+            $basePath = $baseUrl;
+        }
+
+        if ('\\' === DIRECTORY_SEPARATOR) {
+            $basePath = str_replace('\\', '/', $basePath);
+        }
+
+        return rtrim($basePath, '/');
+    }
+
+    /**
+     * Prepares the path info.
+     *
+     * @return string path info
+     */
+    protected function preparePathInfo()
+    {
+        if (null === ($requestUri = $this->getRequestUri())) {
+            return '/';
+        }
+
+        // Remove the query string from REQUEST_URI
+        if (false !== $pos = strpos($requestUri, '?')) {
+            $requestUri = substr($requestUri, 0, $pos);
+        }
+        if ('' !== $requestUri && '/' !== $requestUri[0]) {
+            $requestUri = '/'.$requestUri;
+        }
+
+        if (null === ($baseUrl = $this->getBaseUrl())) {
+            return $requestUri;
+        }
+
+        $pathInfo = substr($requestUri, strlen($baseUrl));
+        if (false === $pathInfo || '' === $pathInfo) {
+            // If substr() returns false then PATH_INFO is set to an empty string
+            return '/';
+        }
+
+        return (string) $pathInfo;
+    }
+
+    /**
+     * Initializes HTTP request formats.
+     */
+    protected static function initializeFormats()
+    {
+        static::$formats = array(
+            'html' => array('text/html', 'application/xhtml+xml'),
+            'txt' => array('text/plain'),
+            'js' => array('application/javascript', 'application/x-javascript', 'text/javascript'),
+            'css' => array('text/css'),
+            'json' => array('application/json', 'application/x-json'),
+            'jsonld' => array('application/ld+json'),
+            'xml' => array('text/xml', 'application/xml', 'application/x-xml'),
+            'rdf' => array('application/rdf+xml'),
+            'atom' => array('application/atom+xml'),
+            'rss' => array('application/rss+xml'),
+            'form' => array('application/x-www-form-urlencoded'),
+        );
+    }
+
+    /**
+     * Sets the default PHP locale.
+     *
+     * @param string $locale
+     */
+    private function setPhpDefaultLocale($locale)
+    {
+        // if either the class Locale doesn't exist, or an exception is thrown when
+        // setting the default locale, the intl module is not installed, and
+        // the call can be ignored:
+        try {
+            if (class_exists('Locale', false)) {
+                \Locale::setDefault($locale);
+            }
+        } catch (\Exception $e) {
+        }
+    }
+
+    /*
+     * Returns the prefix as encoded in the string when the string starts with
+     * the given prefix, false otherwise.
+     *
+     * @param string $string The urlencoded string
+     * @param string $prefix The prefix not encoded
+     *
+     * @return string|false The prefix as it is encoded in $string, or false
+     */
+    private function getUrlencodedPrefix($string, $prefix)
+    {
+        if (0 !== strpos(rawurldecode($string), $prefix)) {
+            return false;
+        }
+
+        $len = strlen($prefix);
+
+        if (preg_match(sprintf('#^(%%[[:xdigit:]]{2}|.){%d}#', $len), $string, $match)) {
+            return $match[0];
+        }
+
+        return false;
+    }
+
+    private static function createRequestFromFactory(array $query = array(), array $request = array(), array $attributes = array(), array $cookies = array(), array $files = array(), array $server = array(), $content = null)
+    {
+        if (self::$requestFactory) {
+            $request = call_user_func(self::$requestFactory, $query, $request, $attributes, $cookies, $files, $server, $content);
+
+            if (!$request instanceof self) {
+                throw new \LogicException('The Request factory must return an instance of Symfony\Component\HttpFoundation\Request.');
+            }
+
+            return $request;
+        }
+
+        return new static($query, $request, $attributes, $cookies, $files, $server, $content);
+    }
+
+    /**
+     * Indicates whether this request originated from a trusted proxy.
+     *
+     * This can be useful to determine whether or not to trust the
+     * contents of a proxy-specific header.
+     *
+     * @return bool true if the request came from a trusted proxy, false otherwise
+     */
+    public function isFromTrustedProxy()
+    {
+        return self::$trustedProxies && IpUtils::checkIp($this->server->get('REMOTE_ADDR'), self::$trustedProxies);
+    }
+
+    private function getTrustedValues($type, $ip = null)
+    {
+        $clientValues = array();
+        $forwardedValues = array();
+
+        if (self::$trustedHeaders[$type] && $this->headers->has(self::$trustedHeaders[$type])) {
+            foreach (explode(',', $this->headers->get(self::$trustedHeaders[$type])) as $v) {
+                $clientValues[] = (self::HEADER_CLIENT_PORT === $type ? '0.0.0.0:' : '').trim($v);
+            }
+        }
+
+        if (self::$trustedHeaders[self::HEADER_FORWARDED] && $this->headers->has(self::$trustedHeaders[self::HEADER_FORWARDED])) {
+            $forwardedValues = $this->headers->get(self::$trustedHeaders[self::HEADER_FORWARDED]);
+            $forwardedValues = preg_match_all(sprintf('{(?:%s)=(?:"?\[?)([a-zA-Z0-9\.:_\-/]*+)}', self::$forwardedParams[$type]), $forwardedValues, $matches) ? $matches[1] : array();
+        }
+
+        if (null !== $ip) {
+            $clientValues = $this->normalizeAndFilterClientIps($clientValues, $ip);
+            $forwardedValues = $this->normalizeAndFilterClientIps($forwardedValues, $ip);
+        }
+
+        if ($forwardedValues === $clientValues || !$clientValues) {
+            return $forwardedValues;
+        }
+
+        if (!$forwardedValues) {
+            return $clientValues;
+        }
+
+        if (!$this->isForwardedValid) {
+            return null !== $ip ? array('0.0.0.0', $ip) : array();
+        }
+        $this->isForwardedValid = false;
+
+        throw new ConflictingHeadersException(sprintf('The request has both a trusted "%s" header and a trusted "%s" header, conflicting with each other. You should either configure your proxy to remove one of them, or configure your project to distrust the offending one.', self::$trustedHeaders[self::HEADER_FORWARDED], self::$trustedHeaders[$type]));
+    }
+
+    private function normalizeAndFilterClientIps(array $clientIps, $ip)
+    {
+        if (!$clientIps) {
+            return array();
+        }
+        $clientIps[] = $ip; // Complete the IP chain with the IP the request actually came from
+        $firstTrustedIp = null;
+
+        foreach ($clientIps as $key => $clientIp) {
+            // Remove port (unfortunately, it does happen)
+            if (preg_match('{((?:\d+\.){3}\d+)\:\d+}', $clientIp, $match)) {
+                $clientIps[$key] = $clientIp = $match[1];
+            }
+
+            if (!filter_var($clientIp, FILTER_VALIDATE_IP)) {
+                unset($clientIps[$key]);
+
+                continue;
+            }
+
+            if (IpUtils::checkIp($clientIp, self::$trustedProxies)) {
+                unset($clientIps[$key]);
+
+                // Fallback to this when the client IP falls into the range of trusted proxies
+                if (null === $firstTrustedIp) {
+                    $firstTrustedIp = $clientIp;
+                }
+            }
+        }
+
+        // Now the IP chain contains only untrusted proxies and the client IP
+        return $clientIps ? array_reverse($clientIps) : array($firstTrustedIp);
+    }
+}