<?php
/**
 * CHttpRequest and CCookieCollection class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright 2008-2013 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */


/**
 * CHttpRequest encapsulates the $_SERVER variable and resolves its inconsistency among different Web servers.
 *
 * CHttpRequest also manages the cookies sent from and sent to the user.
 * By setting {@link enableCookieValidation} to true,
 * cookies sent from the user will be validated to see if they are tampered.
 * The property {@link getCookies cookies} returns the collection of cookies.
 * For more details, see {@link CCookieCollection}.
 *
 * CHttpRequest is a default application component loaded by {@link CWebApplication}. It can be
 * accessed via {@link CWebApplication::getRequest()}.
 *
 * @property string $url Part of the request URL after the host info.
 * @property string $hostInfo Schema and hostname part (with port number if needed) of the request URL (e.g. http://www.yiiframework.com).
 * @property string $baseUrl The relative URL for the application.
 * @property string $scriptUrl The relative URL of the entry script.
 * @property string $pathInfo Part of the request URL that is after the entry script and before the question mark.
 * Note, the returned pathinfo is decoded starting from 1.1.4.
 * Prior to 1.1.4, whether it is decoded or not depends on the server configuration
 * (in most cases it is not decoded).
 * @property string $requestUri The request URI portion for the currently requested URL.
 * @property string $queryString Part of the request URL that is after the question mark.
 * @property boolean $isSecureConnection If the request is sent via secure channel (https).
 * @property string $requestType Request type, such as GET, POST, HEAD, PUT, PATCH, DELETE.
 * @property boolean $isPostRequest Whether this is a POST request.
 * @property boolean $isDeleteRequest Whether this is a DELETE request.
 * @property boolean $isPutRequest Whether this is a PUT request.
 * @property boolean $isPatchRequest Whether this is a PATCH request.
 * @property boolean $isAjaxRequest Whether this is an AJAX (XMLHttpRequest) request.
 * @property boolean $isFlashRequest Whether this is an Adobe Flash or Adobe Flex request.
 * @property string $serverName Server name.
 * @property integer $serverPort Server port number.
 * @property string $urlReferrer URL referrer, null if not present.
 * @property string $userAgent User agent, null if not present.
 * @property string $userHostAddress User IP address.
 * @property string $userHost User host name, null if cannot be determined.
 * @property string $scriptFile Entry script file path (processed w/ realpath()).
 * @property array $browser User browser capabilities.
 * @property string $acceptTypes User browser accept types, null if not present.
 * @property integer $port Port number for insecure requests.
 * @property integer $securePort Port number for secure requests.
 * @property CCookieCollection|CHttpCookie[] $cookies The cookie collection.
 * @property array $preferredAcceptType The user preferred accept type as an array map, e.g. array('type' => 'application', 'subType' => 'xhtml', 'baseType' => 'xml', 'params' => array('q' => 0.9)).
 * @property array $preferredAcceptTypes An array of all user accepted types (as array maps like array('type' => 'application', 'subType' => 'xhtml', 'baseType' => 'xml', 'params' => array('q' => 0.9)) ) in order of preference.
 * @property string $preferredLanguage The user preferred language.
 * @property array $preferredLanguages An array of all user accepted languages in order of preference.
 * @property string $csrfToken The random token for CSRF validation.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.web
 * @since 1.0
 */
class CHttpRequest extends CApplicationComponent
{
	/**
	 * @var boolean whether the parsing of JSON REST requests should return associative arrays for object data.
	 * @see getRestParams
	 * @since 1.1.17
	 */
	public $jsonAsArray = true;
	/**
	 * @var boolean whether cookies should be validated to ensure they are not tampered. Defaults to false.
	 */
	public $enableCookieValidation=false;
	/**
	 * @var boolean whether to enable CSRF (Cross-Site Request Forgery) validation. Defaults to false.
	 * By setting this property to true, forms submitted to an Yii Web application must be originated
	 * from the same application. If not, a 400 HTTP exception will be raised.
	 * Note, this feature requires that the user client accepts cookie.
	 * You also need to use {@link CHtml::form} or {@link CHtml::statefulForm} to generate
	 * the needed HTML forms in your pages.
	 * @see http://seclab.stanford.edu/websec/csrf/csrf.pdf
	 */
	public $enableCsrfValidation=false;
	/**
	 * @var string the name of the token used to prevent CSRF. Defaults to 'YII_CSRF_TOKEN'.
	 * This property is effectively only when {@link enableCsrfValidation} is true.
	 */
	public $csrfTokenName='YII_CSRF_TOKEN';
	/**
	 * @var array the property values (in name-value pairs) used to initialize the CSRF cookie.
	 * Any property of {@link CHttpCookie} may be initialized.
	 * This property is effective only when {@link enableCsrfValidation} is true.
	 */
	public $csrfCookie;

	private $_requestUri;
	private $_pathInfo;
	private $_scriptFile;
	private $_scriptUrl;
	private $_hostInfo;
	private $_baseUrl;
	private $_cookies;
	private $_preferredAcceptTypes;
	private $_preferredLanguages;
	private $_csrfToken;
	private $_restParams;
	private $_httpVersion;

	/**
	 * Initializes the application component.
	 * This method overrides the parent implementation by preprocessing
	 * the user request data.
	 */
	public function init()
	{
		parent::init();
		$this->normalizeRequest();
	}

	/**
	 * Normalizes the request data.
	 * This method strips off slashes in request data if get_magic_quotes_gpc() returns true.
	 * It also performs CSRF validation if {@link enableCsrfValidation} is true.
	 */
	protected function normalizeRequest()
	{
		// normalize request
		if(version_compare(PHP_VERSION,'7.4.0','<'))
		{
			if(function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc())
			{
				if(isset($_GET))
					$_GET=$this->stripSlashes($_GET);
				if(isset($_POST))
					$_POST=$this->stripSlashes($_POST);
				if(isset($_REQUEST))
					$_REQUEST=$this->stripSlashes($_REQUEST);
				if(isset($_COOKIE))
					$_COOKIE=$this->stripSlashes($_COOKIE);
			}
		}

		if($this->enableCsrfValidation)
			Yii::app()->attachEventHandler('onBeginRequest',array($this,'validateCsrfToken'));
	}


	/**
	 * Strips slashes from input data.
	 * This method is applied when magic quotes is enabled.
	 * @param mixed $data input data to be processed
	 * @return mixed processed data
	 */
	public function stripSlashes(&$data)
	{
		if(is_array($data))
		{
			if(count($data) == 0)
				return $data;
			$keys=array_map('stripslashes',array_keys($data));
			$data=array_combine($keys,array_values($data));
			return array_map(array($this,'stripSlashes'),$data);
		}
		else
			return stripslashes($data);
	}

	/**
	 * Returns the named GET or POST parameter value.
	 * If the GET or POST parameter does not exist, the second parameter to this method will be returned.
	 * If both GET and POST contains such a named parameter, the GET parameter takes precedence.
	 * @param string $name the GET parameter name
	 * @param mixed $defaultValue the default parameter value if the GET parameter does not exist.
	 * @return mixed the GET parameter value
	 * @see getQuery
	 * @see getPost
	 */
	public function getParam($name,$defaultValue=null)
	{
		return isset($_GET[$name]) ? $_GET[$name] : (isset($_POST[$name]) ? $_POST[$name] : $defaultValue);
	}

	/**
	 * Returns the named GET parameter value.
	 * If the GET parameter does not exist, the second parameter to this method will be returned.
	 * @param string $name the GET parameter name
	 * @param mixed $defaultValue the default parameter value if the GET parameter does not exist.
	 * @return mixed the GET parameter value
	 * @see getPost
	 * @see getParam
	 */
	public function getQuery($name,$defaultValue=null)
	{
		return isset($_GET[$name]) ? $_GET[$name] : $defaultValue;
	}

	/**
	 * Returns the named POST parameter value.
	 * If the POST parameter does not exist, the second parameter to this method will be returned.
	 * @param string $name the POST parameter name
	 * @param mixed $defaultValue the default parameter value if the POST parameter does not exist.
	 * @return mixed the POST parameter value
	 * @see getParam
	 * @see getQuery
	 */
	public function getPost($name,$defaultValue=null)
	{
		return isset($_POST[$name]) ? $_POST[$name] : $defaultValue;
	}

	/**
	 * Returns the named DELETE parameter value.
	 * If the DELETE parameter does not exist or if the current request is not a DELETE request,
	 * the second parameter to this method will be returned.
	 * If the DELETE request was tunneled through POST via _method parameter, the POST parameter
	 * will be returned instead (available since version 1.1.11).
	 * @param string $name the DELETE parameter name
	 * @param mixed $defaultValue the default parameter value if the DELETE parameter does not exist.
	 * @return mixed the DELETE parameter value
	 * @since 1.1.7
	 */
	public function getDelete($name,$defaultValue=null)
	{
		if($this->getIsDeleteViaPostRequest())
			return $this->getPost($name, $defaultValue);

		if($this->getIsDeleteRequest())
		{
			$restParams=$this->getRestParams();
			return isset($restParams[$name]) ? $restParams[$name] : $defaultValue;
		}
		else
			return $defaultValue;
	}

	/**
	 * Returns the named PUT parameter value.
	 * If the PUT parameter does not exist or if the current request is not a PUT request,
	 * the second parameter to this method will be returned.
	 * If the PUT request was tunneled through POST via _method parameter, the POST parameter
	 * will be returned instead (available since version 1.1.11).
	 * @param string $name the PUT parameter name
	 * @param mixed $defaultValue the default parameter value if the PUT parameter does not exist.
	 * @return mixed the PUT parameter value
	 * @since 1.1.7
	 */
	public function getPut($name,$defaultValue=null)
	{
		if($this->getIsPutViaPostRequest())
			return $this->getPost($name, $defaultValue);

		if($this->getIsPutRequest())
		{
			$restParams=$this->getRestParams();
			return isset($restParams[$name]) ? $restParams[$name] : $defaultValue;
		}
		else
			return $defaultValue;
	}

	/**
	 * Returns the named PATCH parameter value.
	 * If the PATCH parameter does not exist or if the current request is not a PATCH request,
	 * the second parameter to this method will be returned.
	 * If the PATCH request was tunneled through POST via _method parameter, the POST parameter
	 * will be returned instead.
	 * @param string $name the PATCH parameter name
	 * @param mixed $defaultValue the default parameter value if the PATCH parameter does not exist.
	 * @return mixed the PATCH parameter value
	 * @since 1.1.16
	 */
	public function getPatch($name,$defaultValue=null)
	{
		if($this->getIsPatchViaPostRequest())
			return $this->getPost($name, $defaultValue);

		if($this->getIsPatchRequest())
		{
			$restParams=$this->getRestParams();
			return isset($restParams[$name]) ? $restParams[$name] : $defaultValue;
		}
		else
			return $defaultValue;
	}

	/**
	 * Returns request parameters. Typically PUT, PATCH or DELETE.
	 * @return array the request parameters
	 * @since 1.1.7
	 * @since 1.1.13 method became public
	 */
	public function getRestParams()
	{
		if($this->_restParams===null)
		{
			$result=array();
			if (strncmp($this->getContentType(), 'application/json', 16) === 0)
				$result = CJSON::decode($this->getRawBody(), $this->jsonAsArray);
			elseif(function_exists('mb_parse_str'))
				mb_parse_str($this->getRawBody(), $result);
			else
				parse_str($this->getRawBody(), $result);
			$this->_restParams=$result;
		}

		return $this->_restParams;
	}

	/**
	 * Returns the raw HTTP request body.
	 * @return string the request body
	 * @since 1.1.13
	 */
	public function getRawBody()
	{
		static $rawBody;
		if($rawBody===null)
			$rawBody=file_get_contents('php://input');
		return $rawBody;
	}

	/**
	 * Returns the currently requested URL.
	 * This is the same as {@link getRequestUri}.
	 * @return string part of the request URL after the host info.
	 */
	public function getUrl()
	{
		return $this->getRequestUri();
	}

	/**
	 * Returns the schema and host part of the application URL.
	 * The returned URL does not have an ending slash.
	 * By default this is determined based on the user request information.
	 * You may explicitly specify it by setting the {@link setHostInfo hostInfo} property.
	 * @param string $schema schema to use (e.g. http, https). If empty, the schema used for the current request will be used.
	 * @return string schema and hostname part (with port number if needed) of the request URL (e.g. http://www.yiiframework.com)
	 * @see setHostInfo
	 */
	public function getHostInfo($schema='')
	{
		if($this->_hostInfo===null)
		{
			if($secure=$this->getIsSecureConnection())
				$http='https';
			else
				$http='http';
			if(isset($_SERVER['HTTP_HOST']))
				$this->_hostInfo=$http.'://'.$_SERVER['HTTP_HOST'];
			else
			{
				$this->_hostInfo=$http.'://'.$_SERVER['SERVER_NAME'];
				$port=$secure ? $this->getSecurePort() : $this->getPort();
				if(($port!==80 && !$secure) || ($port!==443 && $secure))
					$this->_hostInfo.=':'.$port;
			}
		}
		if($schema!=='')
		{
			$secure=$this->getIsSecureConnection();
			if($secure && $schema==='https' || !$secure && $schema==='http')
				return $this->_hostInfo;

			$port=$schema==='https' ? $this->getSecurePort() : $this->getPort();
			if($port!==80 && $schema==='http' || $port!==443 && $schema==='https')
				$port=':'.$port;
			else
				$port='';

			$pos=strpos($this->_hostInfo,':');
			return $schema.substr($this->_hostInfo,$pos,strcspn($this->_hostInfo,':',$pos+1)+1).$port;
		}
		else
			return $this->_hostInfo;
	}

	/**
	 * Sets the schema and host part of the application URL.
	 * This setter is provided in case the schema and hostname cannot be determined
	 * on certain Web servers.
	 * @param string $value the schema and host part of the application URL.
	 */
	public function setHostInfo($value)
	{
		$this->_hostInfo=rtrim($value,'/');
	}

	/**
	 * Returns the relative URL for the application.
	 * This is similar to {@link getScriptUrl scriptUrl} except that
	 * it does not have the script file name, and the ending slashes are stripped off.
	 * @param boolean $absolute whether to return an absolute URL. Defaults to false, meaning returning a relative one.
	 * @return string the relative URL for the application
	 * @see setScriptUrl
	 */
	public function getBaseUrl($absolute=false)
	{
		if($this->_baseUrl===null)
			$this->_baseUrl=rtrim(dirname($this->getScriptUrl()),'\\/');
		return $absolute ? $this->getHostInfo() . $this->_baseUrl : $this->_baseUrl;
	}

	/**
	 * Sets the relative URL for the application.
	 * By default the URL is determined based on the entry script URL.
	 * This setter is provided in case you want to change this behavior.
	 * @param string $value the relative URL for the application
	 */
	public function setBaseUrl($value)
	{
		$this->_baseUrl=$value;
	}

	/**
	 * Returns the relative URL of the entry script.
	 * The implementation of this method referenced Zend_Controller_Request_Http in Zend Framework.
	 * @throws CException when it is unable to determine the entry script URL.
	 * @return string the relative URL of the entry script.
	 */
	public function getScriptUrl()
	{
		if($this->_scriptUrl===null)
		{
			$scriptName=basename($_SERVER['SCRIPT_FILENAME']);
			if(basename($_SERVER['SCRIPT_NAME'])===$scriptName)
				$this->_scriptUrl=$_SERVER['SCRIPT_NAME'];
			elseif(basename($_SERVER['PHP_SELF'])===$scriptName)
				$this->_scriptUrl=$_SERVER['PHP_SELF'];
			elseif(isset($_SERVER['ORIG_SCRIPT_NAME']) && basename($_SERVER['ORIG_SCRIPT_NAME'])===$scriptName)
				$this->_scriptUrl=$_SERVER['ORIG_SCRIPT_NAME'];
			elseif(($pos=strpos($_SERVER['PHP_SELF'],'/'.$scriptName))!==false)
				$this->_scriptUrl=substr($_SERVER['SCRIPT_NAME'],0,$pos).'/'.$scriptName;
			elseif(isset($_SERVER['DOCUMENT_ROOT']) && strpos($_SERVER['SCRIPT_FILENAME'],$_SERVER['DOCUMENT_ROOT'])===0)
				$this->_scriptUrl=str_replace('\\','/',str_replace($_SERVER['DOCUMENT_ROOT'],'',$_SERVER['SCRIPT_FILENAME']));
			else
				throw new CException(Yii::t('yii','CHttpRequest is unable to determine the entry script URL.'));
		}
		return $this->_scriptUrl;
	}

	/**
	 * Sets the relative URL for the application entry script.
	 * This setter is provided in case the entry script URL cannot be determined
	 * on certain Web servers.
	 * @param string $value the relative URL for the application entry script.
	 */
	public function setScriptUrl($value)
	{
		$this->_scriptUrl='/'.trim($value,'/');
	}

	/**
	 * Returns the path info of the currently requested URL.
	 * This refers to the part that is after the entry script and before the question mark.
	 * The starting and ending slashes are stripped off.
	 * @return string part of the request URL that is after the entry script and before the question mark.
	 * Note, the returned pathinfo is decoded starting from 1.1.4.
	 * Prior to 1.1.4, whether it is decoded or not depends on the server configuration
	 * (in most cases it is not decoded).
	 * @throws CException if the request URI cannot be determined due to improper server configuration
	 */
	public function getPathInfo()
	{
		if($this->_pathInfo===null)
		{
			$pathInfo=$this->getRequestUri();

			if(($pos=strpos($pathInfo,'?'))!==false)
			   $pathInfo=substr($pathInfo,0,$pos);

			$pathInfo=$this->decodePathInfo($pathInfo);

			$scriptUrl=$this->getScriptUrl();
			$baseUrl=$this->getBaseUrl();
			if(strpos($pathInfo,$scriptUrl)===0)
				$pathInfo=substr($pathInfo,strlen($scriptUrl));
			elseif($baseUrl==='' || strpos($pathInfo,$baseUrl)===0)
				$pathInfo=substr($pathInfo,strlen($baseUrl));
			elseif(strpos($_SERVER['PHP_SELF'],$scriptUrl)===0)
				$pathInfo=substr($_SERVER['PHP_SELF'],strlen($scriptUrl));
			else
				throw new CException(Yii::t('yii','CHttpRequest is unable to determine the path info of the request.'));

			if($pathInfo==='/' || $pathInfo===false)
				$pathInfo='';
			elseif($pathInfo!=='' && $pathInfo[0]==='/')
				$pathInfo=substr($pathInfo,1);

			if(($posEnd=strlen($pathInfo)-1)>0 && $pathInfo[$posEnd]==='/')
				$pathInfo=substr($pathInfo,0,$posEnd);

			$this->_pathInfo=$pathInfo;
		}
		return $this->_pathInfo;
	}

	/**
	 * Decodes the path info.
	 * This method is an improved variant of the native urldecode() function and used in {@link getPathInfo getPathInfo()} to
	 * decode the path part of the request URI. You may override this method to change the way the path info is being decoded.
	 * @param string $pathInfo encoded path info
	 * @return string decoded path info
	 * @since 1.1.10
	 */
	protected function decodePathInfo($pathInfo)
	{
		$pathInfo = urldecode($pathInfo);

		// is it UTF-8?
		// http://w3.org/International/questions/qa-forms-utf-8.html
		if(preg_match('%^(?:
		   [\x09\x0A\x0D\x20-\x7E]            # ASCII
		 | [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
		 | \xE0[\xA0-\xBF][\x80-\xBF]         # excluding overlongs
		 | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
		 | \xED[\x80-\x9F][\x80-\xBF]         # excluding surrogates
		 | \xF0[\x90-\xBF][\x80-\xBF]{2}      # planes 1-3
		 | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
		 | \xF4[\x80-\x8F][\x80-\xBF]{2}      # plane 16
		)*$%xs', $pathInfo))
		{
			return $pathInfo;
		}
		else
		{
			return utf8_encode($pathInfo);
		}
	}

	/**
	 * Returns the request URI portion for the currently requested URL.
	 * This refers to the portion that is after the {@link hostInfo host info} part.
	 * It includes the {@link queryString query string} part if any.
	 * The implementation of this method referenced Zend_Controller_Request_Http in Zend Framework.
	 * @return string the request URI portion for the currently requested URL.
	 * @throws CException if the request URI cannot be determined due to improper server configuration
	 */
	public function getRequestUri()
	{
		if($this->_requestUri===null)
		{
			if(isset($_SERVER['REQUEST_URI']))
			{
				$this->_requestUri=$_SERVER['REQUEST_URI'];
				if(!empty($_SERVER['HTTP_HOST']))
				{
					if(strpos($this->_requestUri,$_SERVER['HTTP_HOST'])!==false)
						$this->_requestUri=preg_replace('/^\w+:\/\/[^\/]+/','',$this->_requestUri);
				}
				else
					$this->_requestUri=preg_replace('/^(http|https):\/\/[^\/]+/i','',$this->_requestUri);
			}
			elseif(isset($_SERVER['ORIG_PATH_INFO']))  // IIS 5.0 CGI
			{
				$this->_requestUri=$_SERVER['ORIG_PATH_INFO'];
				if(!empty($_SERVER['QUERY_STRING']))
					$this->_requestUri.='?'.$_SERVER['QUERY_STRING'];
			}
			else
				throw new CException(Yii::t('yii','CHttpRequest is unable to determine the request URI.'));
		}

		return $this->_requestUri;
	}

	/**
	 * Returns part of the request URL that is after the question mark.
	 * @return string part of the request URL that is after the question mark
	 */
	public function getQueryString()
	{
		return isset($_SERVER['QUERY_STRING'])?$_SERVER['QUERY_STRING']:'';
	}

	/**
	 * Return if the request is sent via secure channel (https).
	 * @return boolean if the request is sent via secure channel (https)
	 */
	public function getIsSecureConnection()
	{
		return isset($_SERVER['HTTPS']) && (strcasecmp($_SERVER['HTTPS'],'on')===0 || $_SERVER['HTTPS']==1)
			|| isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strcasecmp($_SERVER['HTTP_X_FORWARDED_PROTO'],'https')===0;
	}

	/**
	 * Returns the request type, such as GET, POST, HEAD, PUT, PATCH, DELETE.
	 * Request type can be manually set in POST requests with a parameter named _method. Useful
	 * for RESTful request from older browsers which do not support PUT, PATCH or DELETE
	 * natively (available since version 1.1.11).
	 * @return string request type, such as GET, POST, HEAD, PUT, PATCH, DELETE.
	 */
	public function getRequestType()
	{
		if(isset($_POST['_method']))
			return strtoupper($_POST['_method']);
		elseif(isset($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE']))
			return strtoupper($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE']);

		return strtoupper(isset($_SERVER['REQUEST_METHOD'])?$_SERVER['REQUEST_METHOD']:'GET');
	}

	/**
	 * Returns whether this is a POST request.
	 * @return boolean whether this is a POST request.
	 */
	public function getIsPostRequest()
	{
		return isset($_SERVER['REQUEST_METHOD']) && !strcasecmp($_SERVER['REQUEST_METHOD'],'POST');
	}

	/**
	 * Returns whether this is a DELETE request.
	 * @return boolean whether this is a DELETE request.
	 * @since 1.1.7
	 */
	public function getIsDeleteRequest()
	{
		return (isset($_SERVER['REQUEST_METHOD']) && !strcasecmp($_SERVER['REQUEST_METHOD'],'DELETE')) || $this->getIsDeleteViaPostRequest();
	}

	/**
	 * Returns whether this is a DELETE request which was tunneled through POST.
	 * @return boolean whether this is a DELETE request tunneled through POST.
	 * @since 1.1.11
	 */
	protected function getIsDeleteViaPostRequest()
	{
		return isset($_POST['_method']) && !strcasecmp($_POST['_method'],'DELETE');
	}

	/**
	 * Returns whether this is a PUT request.
	 * @return boolean whether this is a PUT request.
	 * @since 1.1.7
	 */
	public function getIsPutRequest()
	{
		return (isset($_SERVER['REQUEST_METHOD']) && !strcasecmp($_SERVER['REQUEST_METHOD'],'PUT')) || $this->getIsPutViaPostRequest();
	}

	/**
	 * Returns whether this is a PUT request which was tunneled through POST.
	 * @return boolean whether this is a PUT request tunneled through POST.
	 * @since 1.1.11
	 */
	protected function getIsPutViaPostRequest()
	{
		return isset($_POST['_method']) && !strcasecmp($_POST['_method'],'PUT');
	}

	/**
	 * Returns whether this is a PATCH request.
	 * @return boolean whether this is a PATCH request.
	 * @since 1.1.16
	 */
	public function getIsPatchRequest()
	{
		return (isset($_SERVER['REQUEST_METHOD']) && !strcasecmp($_SERVER['REQUEST_METHOD'],'PATCH')) || $this->getIsPatchViaPostRequest();
	}

	/**
	 * Returns whether this is a PATCH request which was tunneled through POST.
	 * @return boolean whether this is a PATCH request tunneled through POST.
	 * @since 1.1.16
	 */
	protected function getIsPatchViaPostRequest()
	{
		return isset($_POST['_method']) && !strcasecmp($_POST['_method'],'PATCH');
	}

	/**
	 * Returns whether this is an AJAX (XMLHttpRequest) request.
	 * @return boolean whether this is an AJAX (XMLHttpRequest) request.
	 */
	public function getIsAjaxRequest()
	{
		return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH']==='XMLHttpRequest';
	}

	/**
	 * Returns whether this is an Adobe Flash or Adobe Flex request.
	 * @return boolean whether this is an Adobe Flash or Adobe Flex request.
	 * @since 1.1.11
	 */
	public function getIsFlashRequest()
	{
		return isset($_SERVER['HTTP_USER_AGENT']) && (stripos($_SERVER['HTTP_USER_AGENT'],'Shockwave')!==false || stripos($_SERVER['HTTP_USER_AGENT'],'Flash')!==false);
	}

	/**
	 * Returns the server name.
	 * @return string server name
	 */
	public function getServerName()
	{
		return $_SERVER['SERVER_NAME'];
	}

	/**
	 * Returns the server port number.
	 * @return integer server port number
	 */
	public function getServerPort()
	{
		return $_SERVER['SERVER_PORT'];
	}

	/**
	 * Returns the URL referrer, null if not present
	 * @return string URL referrer, null if not present
	 */
	public function getUrlReferrer()
	{
		return isset($_SERVER['HTTP_REFERER'])?$_SERVER['HTTP_REFERER']:null;
	}

	/**
	 * Returns the user agent, null if not present.
	 * @return string user agent, null if not present
	 */
	public function getUserAgent()
	{
		return isset($_SERVER['HTTP_USER_AGENT'])?$_SERVER['HTTP_USER_AGENT']:null;
	}

	/**
	 * Returns the user IP address.
	 * @return string user IP address
	 */
	public function getUserHostAddress()
	{
		return isset($_SERVER['REMOTE_ADDR'])?$_SERVER['REMOTE_ADDR']:'127.0.0.1';
	}

	/**
	 * Returns the user host name, null if it cannot be determined.
	 * @return string user host name, null if cannot be determined
	 */
	public function getUserHost()
	{
		return isset($_SERVER['REMOTE_HOST'])?$_SERVER['REMOTE_HOST']:null;
	}

	/**
	 * Returns entry script file path.
	 * @return string entry script file path (processed w/ realpath())
	 */
	public function getScriptFile()
	{
		if($this->_scriptFile!==null)
			return $this->_scriptFile;
		else
			return $this->_scriptFile=realpath($_SERVER['SCRIPT_FILENAME']);
	}

	/**
	 * Returns information about the capabilities of user browser.
	 * @param string $userAgent the user agent to be analyzed. Defaults to null, meaning using the
	 * current User-Agent HTTP header information.
	 * @return array user browser capabilities.
	 * @see http://www.php.net/manual/en/function.get-browser.php
	 */
	public function getBrowser($userAgent=null)
	{
		return get_browser($userAgent,true);
	}

	/**
	 * Returns user browser accept types, null if not present.
	 * @return string user browser accept types, null if not present
	 */
	public function getAcceptTypes()
	{
		return isset($_SERVER['HTTP_ACCEPT'])?$_SERVER['HTTP_ACCEPT']:null;
	}
	
	/**
	 * Returns request content-type
	 * The Content-Type header field indicates the MIME type of the data
	 * contained in {@link getRawBody()} or, in the case of the HEAD method, the
	 * media type that would have been sent had the request been a GET.
	 * @return string request content-type. Null is returned if this information is not available.
	 * @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17
	 * HTTP 1.1 header field definitions
	 * @since 1.1.17
	 */
	public function getContentType()
	{
		if (isset($_SERVER["CONTENT_TYPE"])) {
			return $_SERVER["CONTENT_TYPE"];
		} elseif (isset($_SERVER["HTTP_CONTENT_TYPE"])) {
			//fix bug https://bugs.php.net/bug.php?id=66606
			return $_SERVER["HTTP_CONTENT_TYPE"];
		}
		return null;
	}

	private $_port;

 	/**
	 * Returns the port to use for insecure requests.
	 * Defaults to 80, or the port specified by the server if the current
	 * request is insecure.
	 * You may explicitly specify it by setting the {@link setPort port} property.
	 * @return integer port number for insecure requests.
	 * @see setPort
	 * @since 1.1.3
	 */
	public function getPort()
	{
		if($this->_port===null)
			$this->_port=!$this->getIsSecureConnection() && isset($_SERVER['SERVER_PORT']) ? (int)$_SERVER['SERVER_PORT'] : 80;
		return $this->_port;
	}

	/**
	 * Sets the port to use for insecure requests.
	 * This setter is provided in case a custom port is necessary for certain
	 * server configurations.
	 * @param integer $value port number.
	 * @since 1.1.3
	 */
	public function setPort($value)
	{
		$this->_port=(int)$value;
		$this->_hostInfo=null;
	}

	private $_securePort;

	/**
	 * Returns the port to use for secure requests.
	 * Defaults to 443, or the port specified by the server if the current
	 * request is secure.
	 * You may explicitly specify it by setting the {@link setSecurePort securePort} property.
	 * @return integer port number for secure requests.
	 * @see setSecurePort
	 * @since 1.1.3
	 */
	public function getSecurePort()
	{
		if($this->_securePort===null)
			$this->_securePort=$this->getIsSecureConnection() && isset($_SERVER['SERVER_PORT']) ? (int)$_SERVER['SERVER_PORT'] : 443;
		return $this->_securePort;
	}

	/**
	 * Sets the port to use for secure requests.
	 * This setter is provided in case a custom port is necessary for certain
	 * server configurations.
	 * @param integer $value port number.
	 * @since 1.1.3
	 */
	public function setSecurePort($value)
	{
		$this->_securePort=(int)$value;
		$this->_hostInfo=null;
	}

	/**
	 * Returns the cookie collection.
	 * The result can be used like an associative array. Adding {@link CHttpCookie} objects
	 * to the collection will send the cookies to the client; and removing the objects
	 * from the collection will delete those cookies on the client.
	 * @return CCookieCollection the cookie collection.
	 */
	public function getCookies()
	{
		if($this->_cookies!==null)
			return $this->_cookies;
		else
			return $this->_cookies=new CCookieCollection($this);
	}

	/**
	 * Redirects the browser to the specified URL.
	 * @param string $url URL to be redirected to. Note that when URL is not
	 * absolute (not starting with "/") it will be relative to current request URL.
	 * @param boolean $terminate whether to terminate the current application
	 * @param integer $statusCode the HTTP status code. Defaults to 302. See {@link http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html}
	 * for details about HTTP status code.
	 */
	public function redirect($url,$terminate=true,$statusCode=302)
	{
		if(strpos($url,'/')===0 && strpos($url,'//')!==0)
			$url=$this->getHostInfo().$url;
		header('Location: '.$url, true, $statusCode);
		if($terminate)
			Yii::app()->end();
	}

	/**
	 * Parses an HTTP Accept header, returning an array map with all parts of each entry.
	 * Each array entry consists of a map with the type, subType, baseType and params, an array map of key-value parameters,
	 * obligatorily including a `q` value (i.e. preference ranking) as a double.
	 * For example, an Accept header value of <code>'application/xhtml+xml;q=0.9;level=1'</code> would give an array entry of
	 * <pre>
	 * array(
	 *        'type' => 'application',
	 *        'subType' => 'xhtml',
	 *        'baseType' => 'xml',
	 *        'params' => array(
	 *            'q' => 0.9,
	 *            'level' => '1',
	 *        ),
	 * )
	 * </pre>
	 *
	 * <b>Please note:</b>
	 * To avoid great complexity, there are no steps taken to ensure that quoted strings are treated properly.
	 * If the header text includes quoted strings containing space or the , or ; characters then the results may not be correct!
	 *
	 * See also {@link http://tools.ietf.org/html/rfc2616#section-14.1} for details on Accept header.
	 * @param string $header the accept header value to parse
	 * @return array the user accepted MIME types.
	 */
	public static function parseAcceptHeader($header)
	{
		$matches=array();
		$accepts=array();
		// get individual entries with their type, subtype, basetype and params
		preg_match_all('/(?:\G\s?,\s?|^)(\w+|\*)\/(\w+|\*)(?:\+(\w+))?|(?<!^)\G(?:\s?;\s?(\w+)=([\w\.]+))/',$header,$matches);
		// the regexp should (in theory) always return an array of 6 arrays
		if(count($matches)===6)
		{
			$i=0;
			$itemLen=count($matches[1]);
			while($i<$itemLen)
			{
				// fill out a content type
				$accept=array(
					'type'=>$matches[1][$i],
					'subType'=>$matches[2][$i],
					'baseType'=>null,
					'params'=>array(),
				);
				// fill in the base type if it exists
				if($matches[3][$i]!==null && $matches[3][$i]!=='')
					$accept['baseType']=$matches[3][$i];
				// continue looping while there is no new content type, to fill in all accompanying params
				for($i++;$i<$itemLen;$i++)
				{
					// if the next content type is null, then the item is a param for the current content type
					if($matches[1][$i]===null || $matches[1][$i]==='')
					{
						// if this is the quality param, convert it to a double
						if($matches[4][$i]==='q')
						{
							// sanity check on q value
							$q=(double)$matches[5][$i];
							if($q>1)
								$q=(double)1;
							elseif($q<0)
								$q=(double)0;
							$accept['params'][$matches[4][$i]]=$q;
						}
						else
							$accept['params'][$matches[4][$i]]=$matches[5][$i];
					}
					else
						break;
				}
				// q defaults to 1 if not explicitly given
				if(!isset($accept['params']['q']))
					$accept['params']['q']=(double)1;
				$accepts[] = $accept;
			}
		}
		return $accepts;
	}

	/**
	 * Compare function for determining the preference of accepted MIME type array maps
	 * See {@link parseAcceptHeader()} for the format of $a and $b
	 * @param array $a user accepted MIME type as an array map
	 * @param array $b user accepted MIME type as an array map
	 * @return integer -1, 0 or 1 if $a has respectively greater preference, equal preference or less preference than $b (higher preference comes first).
	 */
	public static function compareAcceptTypes($a,$b)
	{
		// check for equal quality first
		if($a['params']['q']===$b['params']['q'])
			if(!($a['type']==='*' xor $b['type']==='*'))
				if (!($a['subType']==='*' xor $b['subType']==='*'))
					// finally, higher number of parameters counts as greater precedence
					if(count($a['params'])===count($b['params']))
						return 0;
					else
						return count($a['params'])<count($b['params']) ? 1 : -1;
				// more specific takes precedence - whichever one doesn't have a * subType
				else
					return $a['subType']==='*' ? 1 : -1;
			// more specific takes precedence - whichever one doesn't have a * type
			else
				return $a['type']==='*' ? 1 : -1;
		else
			return ($a['params']['q']<$b['params']['q']) ? 1 : -1;
	}

	/**
	 * Returns an array of user accepted MIME types in order of preference.
	 * Each array entry consists of a map with the type, subType, baseType and params, an array map of key-value parameters.
	 * See {@link parseAcceptHeader()} for a description of the array map.
	 * @return array the user accepted MIME types, as array maps, in the order of preference.
	 */
	public function getPreferredAcceptTypes()
	{
		if($this->_preferredAcceptTypes===null)
		{
			$accepts=self::parseAcceptHeader($this->getAcceptTypes());
			usort($accepts,array(get_class($this),'compareAcceptTypes'));
			$this->_preferredAcceptTypes=$accepts;
		}
		return $this->_preferredAcceptTypes;
	}

	/**
	 * Returns the user preferred accept MIME type.
	 * The MIME type is returned as an array map (see {@link parseAcceptHeader()}).
	 * @return array the user preferred accept MIME type or false if the user does not have any.
	 */
	public function getPreferredAcceptType()
	{
		$preferredAcceptTypes=$this->getPreferredAcceptTypes();
		return empty($preferredAcceptTypes) ? false : $preferredAcceptTypes[0];
	}

	/**
	 * String compare function used by usort.
	 * Included to circumvent the use of closures (not supported by PHP 5.2) and create_function (deprecated since PHP 7.2.0)
	 * @param array $a
	 * @param array $b
	 * @return int -1 (a>b), 0 (a==b), 1 (a<b)
	 */
	private function stringCompare($a, $b)
	{
		if ($a[0] == $b[0]) {
			return 0;
		}
		return ($a[0] < $b[0]) ? 1 : -1;
	}

	/**
	 * Returns an array of user accepted languages in order of preference.
	 * The returned language IDs will NOT be canonicalized using {@link CLocale::getCanonicalID}.
	 * @return array the user accepted languages in the order of preference.
	 * See {@link http://tools.ietf.org/html/rfc2616#section-14.4}
	 */
	public function getPreferredLanguages()
	{
		if($this->_preferredLanguages===null)
		{
			$sortedLanguages=array();
			if(isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) && $n=preg_match_all('/([\w\-_]+)(?:\s*;\s*q\s*=\s*(\d*\.?\d*))?/',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches))
			{
				$languages=array();

				for($i=0;$i<$n;++$i)
				{
					$q=$matches[2][$i];
					if($q==='')
						$q=1;
					if($q)
						$languages[]=array((float)$q,$matches[1][$i]);
				}

				usort($languages, array($this, 'stringCompare'));
				foreach($languages as $language)
					$sortedLanguages[]=$language[1];
			}
			$this->_preferredLanguages=$sortedLanguages;
		}
		return $this->_preferredLanguages;
	}

	/**
	 * Returns the user-preferred language that should be used by this application.
	 * The language resolution is based on the user preferred languages and the languages
	 * supported by the application. The method will try to find the best match.
	 * @param array $languages a list of the languages supported by the application.
	 * If empty, this method will return the first language returned by [[getPreferredLanguages()]].
	 * @return string the language that the application should use. false is returned if both [[getPreferredLanguages()]]
	 * and `$languages` are empty.
	 */
	public function getPreferredLanguage($languages=array())
	{
		$preferredLanguages=$this->getPreferredLanguages();
		if(empty($languages)) {
			return !empty($preferredLanguages) ? CLocale::getCanonicalID($preferredLanguages[0]) : false;
		}
		foreach ($preferredLanguages as $preferredLanguage) {
			$preferredLanguage=CLocale::getCanonicalID($preferredLanguage);
			foreach ($languages as $language) {
				$language=CLocale::getCanonicalID($language);
				// en_us==en_us, en==en_us, en_us==en
				if($language===$preferredLanguage || strpos($preferredLanguage,$language.'_')===0 || strpos($language,$preferredLanguage.'_')===0) {
					return $language;
				}
			}
		}
		return reset($languages);
	}

	/**
	 * Sends a file to user.
	 * @param string $fileName file name
	 * @param string $content content to be set.
	 * @param string $mimeType mime type of the content. If null, it will be guessed automatically based on the given file name.
	 * @param boolean $terminate whether to terminate the current application after calling this method
	 * @throws CHttpException
	 */
	public function sendFile($fileName,$content,$mimeType=null,$terminate=true)
	{
		if($mimeType===null)
		{
			if(($mimeType=CFileHelper::getMimeTypeByExtension($fileName))===null)
				$mimeType='text/plain';
		}

		$fileSize=(function_exists('mb_strlen') ? mb_strlen($content,'8bit') : strlen($content));
		$contentStart=0;
		$contentEnd=$fileSize-1;

		$httpVersion=$this->getHttpVersion();
		if(isset($_SERVER['HTTP_RANGE']))
		{
			header('Accept-Ranges: bytes');

			//client sent us a multibyte range, can not hold this one for now
			if(strpos($_SERVER['HTTP_RANGE'],',')!==false)
			{
				header("Content-Range: bytes $contentStart-$contentEnd/$fileSize");
				throw new CHttpException(416,'Requested Range Not Satisfiable');
			}

			$range=str_replace('bytes=','',$_SERVER['HTTP_RANGE']);

			//range requests starts from "-", so it means that data must be dumped the end point.
			if($range[0]==='-')
				$contentStart=$fileSize-substr($range,1);
			else
			{
				$range=explode('-',$range);
				$contentStart=$range[0];

				// check if the last-byte-pos presents in header
				if((isset($range[1]) && is_numeric($range[1])))
					$contentEnd=$range[1];
			}

			/* Check the range and make sure it's treated according to the specs.
			 * http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
			 */
			// End bytes can not be larger than $end.
			$contentEnd=($contentEnd > $fileSize) ? $fileSize-1 : $contentEnd;

			// Validate the requested range and return an error if it's not correct.
			$wrongContentStart=($contentStart>$contentEnd || $contentStart>$fileSize-1 || $contentStart<0);

			if($wrongContentStart)
			{
				header("Content-Range: bytes $contentStart-$contentEnd/$fileSize");
				throw new CHttpException(416,'Requested Range Not Satisfiable');
			}

			header("HTTP/$httpVersion 206 Partial Content");
			header("Content-Range: bytes $contentStart-$contentEnd/$fileSize");
		}
		else
			header("HTTP/$httpVersion 200 OK");

		$length=$contentEnd-$contentStart+1; // Calculate new content length

		header('Pragma: public');
		header('Expires: 0');
		header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
		header("Content-Type: $mimeType");
		header('Content-Length: '.$length);
		header("Content-Disposition: attachment; filename=\"$fileName\"");
		header('Content-Transfer-Encoding: binary');
		$content=function_exists('mb_substr') ? mb_substr($content,$contentStart,$length,'8bit') : substr($content,$contentStart,$length);

		if($terminate)
		{
			// clean up the application first because the file downloading could take long time
			// which may cause timeout of some resources (such as DB connection)
			ob_start();
			Yii::app()->end(0,false);
			ob_end_clean();
			echo $content;
			exit(0);
		}
		else
			echo $content;
	}

	/**
	 * Sends existing file to a browser as a download using x-sendfile.
	 *
	 * X-Sendfile is a feature allowing a web application to redirect the request for a file to the webserver
	 * that in turn processes the request, this way eliminating the need to perform tasks like reading the file
	 * and sending it to the user. When dealing with a lot of files (or very big files) this can lead to a great
	 * increase in performance as the web application is allowed to terminate earlier while the webserver is
	 * handling the request.
	 *
	 * The request is sent to the server through a special non-standard HTTP-header.
	 * When the web server encounters the presence of such header it will discard all output and send the file
	 * specified by that header using web server internals including all optimizations like caching-headers.
	 *
	 * As this header directive is non-standard different directives exists for different web servers applications:
	 * <ul>
	 * <li>Apache: {@link http://tn123.org/mod_xsendfile X-Sendfile}</li>
	 * <li>Lighttpd v1.4: {@link http://redmine.lighttpd.net/projects/lighttpd/wiki/X-LIGHTTPD-send-file X-LIGHTTPD-send-file}</li>
	 * <li>Lighttpd v1.5: {@link http://redmine.lighttpd.net/projects/lighttpd/wiki/X-LIGHTTPD-send-file X-Sendfile}</li>
	 * <li>Nginx: {@link http://wiki.nginx.org/XSendfile X-Accel-Redirect}</li>
	 * <li>Cherokee: {@link http://www.cherokee-project.com/doc/other_goodies.html#x-sendfile X-Sendfile and X-Accel-Redirect}</li>
	 * </ul>
	 * So for this method to work the X-SENDFILE option/module should be enabled by the web server and
	 * a proper xHeader should be sent.
	 *
	 * <b>Note:</b>
	 * This option allows to download files that are not under web folders, and even files that are otherwise protected (deny from all) like .htaccess
	 *
	 * <b>Side effects</b>:
	 * If this option is disabled by the web server, when this method is called a download configuration dialog
	 * will open but the downloaded file will have 0 bytes.
	 *
	 * <b>Known issues</b>:
	 * There is a Bug with Internet Explorer 6, 7 and 8 when X-SENDFILE is used over an SSL connection, it will show
	 * an error message like this: "Internet Explorer was not able to open this Internet site. The requested site is either unavailable or cannot be found.".
	 * You can work around this problem by removing the <code>Pragma</code>-header.
	 *
	 * <b>Example</b>:
	 * <pre>
	 * <?php
	 *    Yii::app()->request->xSendFile('/home/user/Pictures/picture1.jpg',array(
	 *        'saveName'=>'image1.jpg',
	 *        'mimeType'=>'image/jpeg',
	 *        'terminate'=>false,
	 *    ));
	 * ?>
	 * </pre>
	 * @param string $filePath file name with full path
	 * @param array $options additional options:
	 * <ul>
	 * <li>saveName: file name shown to the user, if not set real file name will be used</li>
	 * <li>mimeType: mime type of the file, if not set it will be guessed automatically based on the file name, if set to null no content-type header will be sent.</li>
	 * <li>xHeader: appropriate x-sendfile header, defaults to "X-Sendfile"</li>
	 * <li>terminate: whether to terminate the current application after calling this method, defaults to true</li>
	 * <li>forceDownload: specifies whether the file will be downloaded or shown inline, defaults to true. (Since version 1.1.9.)</li>
	 * <li>addHeaders: an array of additional http headers in header-value pairs (available since version 1.1.10)</li>
	 * </ul>
	 */
	public function xSendFile($filePath, $options=array())
	{
		if(!isset($options['forceDownload']) || $options['forceDownload'])
			$disposition='attachment';
		else
			$disposition='inline';

		if(!isset($options['saveName']))
			$options['saveName']=basename($filePath);

		if(!isset($options['mimeType']))
		{
			if(($options['mimeType']=CFileHelper::getMimeTypeByExtension($filePath))===null)
				$options['mimeType']='text/plain';
		}

		if(!isset($options['xHeader']))
			$options['xHeader']='X-Sendfile';

		if($options['mimeType']!==null)
			header('Content-Type: '.$options['mimeType']);
		header('Content-Disposition: '.$disposition.'; filename="'.$options['saveName'].'"');
		if(isset($options['addHeaders']))
		{
			foreach($options['addHeaders'] as $header=>$value)
				header($header.': '.$value);
		}
		header(trim($options['xHeader']).': '.$filePath);

		if(!isset($options['terminate']) || $options['terminate'])
			Yii::app()->end();
	}

	/**
	 * Returns the random token used to perform CSRF validation.
	 * The token will be read from cookie first. If not found, a new token
	 * will be generated.
	 * @return string the random token for CSRF validation.
	 * @see enableCsrfValidation
	 */
	public function getCsrfToken()
	{
		if($this->_csrfToken===null)
		{
			$cookie=$this->getCookies()->itemAt($this->csrfTokenName);
			if(!$cookie || ($this->_csrfToken=$cookie->value)==null)
			{
				$cookie=$this->createCsrfCookie();
				$this->_csrfToken=$cookie->value;
				$this->getCookies()->add($cookie->name,$cookie);
			}
		}

		return $this->_csrfToken;
	}

	/**
	 * Creates a cookie with a randomly generated CSRF token.
	 * Initial values specified in {@link csrfCookie} will be applied
	 * to the generated cookie.
	 * @return CHttpCookie the generated cookie
	 * @see enableCsrfValidation
	 */
	protected function createCsrfCookie()
	{
		$securityManager=Yii::app()->getSecurityManager();
		$token=$securityManager->generateRandomBytes(32);
		$maskedToken=$securityManager->maskToken($token);
		$cookie=new CHttpCookie($this->csrfTokenName,$maskedToken);
		if(is_array($this->csrfCookie))
		{
			foreach($this->csrfCookie as $name=>$value)
				$cookie->$name=$value;
		}
		return $cookie;
	}

	/**
	 * Performs the CSRF validation.
	 * This is the event handler responding to {@link CApplication::onBeginRequest}.
	 * The default implementation will compare the CSRF token obtained
	 * from a cookie and from a POST field. If they are different, a CSRF attack is detected.
	 * @param CEvent $event event parameter
	 * @throws CHttpException if the validation fails
	 */
	public function validateCsrfToken($event)
	{
		if ($this->getIsPostRequest() ||
			$this->getIsPutRequest() ||
			$this->getIsPatchRequest() ||
			$this->getIsDeleteRequest())
		{
			$cookies=$this->getCookies();

			$method=$this->getRequestType();
			switch($method)
			{
				case 'POST':
					$maskedUserToken=$this->getPost($this->csrfTokenName);
				break;
				case 'PUT':
					$maskedUserToken=$this->getPut($this->csrfTokenName);
				break;
				case 'PATCH':
					$maskedUserToken=$this->getPatch($this->csrfTokenName);
				break;
				case 'DELETE':
					$maskedUserToken=$this->getDelete($this->csrfTokenName);
			}

			if (!empty($maskedUserToken) && $cookies->contains($this->csrfTokenName))
			{
				$securityManager=Yii::app()->getSecurityManager();
				$maskedCookieToken=$cookies->itemAt($this->csrfTokenName)->value;
				$cookieToken=$securityManager->unmaskToken($maskedCookieToken);
				$userToken=$securityManager->unmaskToken($maskedUserToken);
				$valid=$cookieToken===$userToken;
			}
			else
				$valid = false;
			if (!$valid)
				throw new CHttpException(400,Yii::t('yii','The CSRF token could not be verified.'));
		}
	}


	/**
	 * Returns the version of the HTTP protocol used by client.
	 *
	 * @return string the version of the HTTP protocol.
	 * @since 1.1.16
	 */
	public function getHttpVersion()
	{
		if($this->_httpVersion===null)
		{
			if(isset($_SERVER['SERVER_PROTOCOL']) && $_SERVER['SERVER_PROTOCOL']==='HTTP/1.0')
				$this->_httpVersion='1.0';
			else
				$this->_httpVersion='1.1';
		}
		return $this->_httpVersion;
	}
}


/**
 * CCookieCollection implements a collection class to store cookies.
 *
 * You normally access it via {@link CHttpRequest::getCookies()}.
 *
 * Since CCookieCollection extends from {@link CMap}, it can be used
 * like an associative array as follows:
 * <pre>
 * $cookies[$name]=new CHttpCookie($name,$value); // sends a cookie
 * $value=$cookies[$name]->value; // reads a cookie value
 * unset($cookies[$name]);  // removes a cookie
 * </pre>
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.web
 * @since 1.0
 */
class CCookieCollection extends CMap
{
	private $_request;
	private $_initialized=false;

	/**
	 * Constructor.
	 * @param CHttpRequest $request owner of this collection.
	 */
	public function __construct(CHttpRequest $request)
	{
		$this->_request=$request;
		$this->copyfrom($this->getCookies());
		$this->_initialized=true;
	}

	/**
	 * @return CHttpRequest the request instance
	 */
	public function getRequest()
	{
		return $this->_request;
	}

	/**
	 * @return array list of validated cookies
	 */
	protected function getCookies()
	{
		$cookies=array();
		if($this->_request->enableCookieValidation)
		{
			$sm=Yii::app()->getSecurityManager();
			foreach($_COOKIE as $name=>$value)
			{
				if(is_string($value) && ($value=$sm->validateData($value))!==false)
					$cookies[$name]=new CHttpCookie($name,@unserialize($value));
			}
		}
		else
		{
			foreach($_COOKIE as $name=>$value)
				$cookies[$name]=new CHttpCookie($name,$value);
		}
		return $cookies;
	}

	/**
	 * Adds a cookie with the specified name.
	 * This overrides the parent implementation by performing additional
	 * operations for each newly added CHttpCookie object.
	 * @param mixed $name Cookie name.
	 * @param CHttpCookie $cookie Cookie object.
	 * @throws CException if the item to be inserted is not a CHttpCookie object.
	 */
	public function add($name,$cookie)
	{
		if($cookie instanceof CHttpCookie)
		{
			$this->remove($name);
			parent::add($name,$cookie);
			if($this->_initialized)
				$this->addCookie($cookie);
		}
		else
			throw new CException(Yii::t('yii','CHttpCookieCollection can only hold CHttpCookie objects.'));
	}

	/**
	 * Removes a cookie with the specified name.
	 * This overrides the parent implementation by performing additional
	 * cleanup work when removing a CHttpCookie object.
	 * Since version 1.1.11, the second parameter is available that can be used to specify
	 * the options of the CHttpCookie being removed. For example, this may be useful when dealing
	 * with ".domain.tld" where multiple subdomains are expected to be able to manage cookies:
	 *
	 * <pre>
	 * $options=array('domain'=>'.domain.tld');
	 * Yii::app()->request->cookies['foo']=new CHttpCookie('cookie','value',$options);
	 * Yii::app()->request->cookies->remove('cookie',$options);
	 * </pre>
	 *
	 * @param mixed $name Cookie name.
	 * @param array $options Cookie configuration array consisting of name-value pairs, available since 1.1.11.
	 * @return CHttpCookie The removed cookie object.
	 */
	public function remove($name,$options=array())
	{
		if(($cookie=parent::remove($name))!==null)
		{
			if($this->_initialized)
			{
				$cookie->configure($options);
				$this->removeCookie($cookie);
			}
		}

		return $cookie;
	}

	/**
	 * Sends a cookie.
	 * @param CHttpCookie $cookie cookie to be sent
	 */
	protected function addCookie($cookie)
	{
		$value=$cookie->value;
		if($this->_request->enableCookieValidation)
			$value=Yii::app()->getSecurityManager()->hashData(serialize($value));
		if(version_compare(PHP_VERSION,'7.3.0','>='))
			setcookie($cookie->name,$value,$this->getCookieOptions($cookie));
		elseif(version_compare(PHP_VERSION,'5.2.0','>='))
			setcookie($cookie->name,$value,$cookie->expire,$cookie->path,$cookie->domain,$cookie->secure,$cookie->httpOnly);
		else
			setcookie($cookie->name,$value,$cookie->expire,$cookie->path,$cookie->domain,$cookie->secure);
	}

	/**
	 * Deletes a cookie.
	 * @param CHttpCookie $cookie cookie to be deleted
	 */
	protected function removeCookie($cookie)
	{
		$cookie->expire=0;
		if(version_compare(PHP_VERSION,'7.3.0','>='))
			setcookie($cookie->name,'',$this->getCookieOptions($cookie));
		elseif(version_compare(PHP_VERSION,'5.2.0','>='))
			setcookie($cookie->name,'',$cookie->expire,$cookie->path,$cookie->domain,$cookie->secure,$cookie->httpOnly);
		else
			setcookie($cookie->name,'',$cookie->expire,$cookie->path,$cookie->domain,$cookie->secure);
	}

	/**
	 * Builds the setcookie $options parameter.
	 * @param CHttpCookie $cookie
	 * @return array
	 */
	protected function getCookieOptions($cookie)
	{
		return array(
			'expires'=>$cookie->expire,
			'path'=>$cookie->path,
			'domain'=>$cookie->domain,
			'secure'=>$cookie->secure,
			'httpOnly'=>$cookie->httpOnly,
			'sameSite'=>$cookie->sameSite
		);
	}
}
