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<?php |
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namespace SilverStripe\Core\Startup; |
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use SilverStripe\Control\Controller; |
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use SilverStripe\Control\Director; |
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use SilverStripe\Control\HTTPRequest; |
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use SilverStripe\Control\HTTPResponse; |
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use SilverStripe\Core\Convert; |
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use SilverStripe\Security\RandomGenerator; |
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/** |
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* This is used to protect dangerous GET parameters that need to be detected early in the request |
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* lifecycle by generating a one-time-use token & redirecting with that token included in the |
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* redirected URL |
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* |
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* @internal This class is designed specifically for use pre-startup and may change without warning |
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*/ |
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class ParameterConfirmationToken extends AbstractConfirmationToken |
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{ |
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/** |
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* The name of the parameter |
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* |
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* @var string |
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*/ |
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protected $parameterName = null; |
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/** |
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* The parameter given in the main request |
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* |
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* @var string|null The string value, or null if not provided |
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*/ |
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protected $parameter = null; |
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/** |
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* The parameter given in the backURL |
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* |
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* @var string|null |
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*/ |
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protected $parameterBackURL = null; |
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/** |
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* @param string $parameterName Name of the querystring parameter to check |
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* @param HTTPRequest $request |
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*/ |
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public function __construct($parameterName, HTTPRequest $request) |
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{ |
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// Store the parameter name |
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$this->parameterName = $parameterName; |
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$this->request = $request; |
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// Store the parameter value |
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$this->parameter = $request->getVar($parameterName); |
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$this->parameterBackURL = $this->backURLToken($request); |
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// If the token provided is valid, mark it as such |
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$token = $request->getVar($parameterName . 'token'); |
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if ($this->checkToken($token)) { |
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$this->token = $token; |
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} |
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} |
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/** |
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* Check if this token exists in the BackURL |
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* |
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* @param HTTPRequest $request |
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* @return string Value of token in backurl, or null if not in backurl |
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*/ |
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protected function backURLToken(HTTPRequest $request) |
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{ |
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$backURL = $request->getVar('BackURL'); |
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if (!strstr($backURL, '?')) { |
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return null; |
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} |
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// Filter backURL if it contains the given request parameter |
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list(,$query) = explode('?', $backURL); |
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parse_str($query, $queryArgs); |
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$name = $this->getName(); |
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if (isset($queryArgs[$name])) { |
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return $queryArgs[$name]; |
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} |
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return null; |
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} |
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/** |
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* Get the name of this token |
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* |
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* @return string |
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*/ |
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public function getName() |
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{ |
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return $this->parameterName; |
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} |
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/** |
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* Is the parameter requested? |
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* ?parameter and ?parameter=1 are both considered requested |
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* |
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* @return bool |
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*/ |
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public function parameterProvided() |
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{ |
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return $this->parameter !== null; |
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} |
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/** |
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* Is the parmeter requested in a BackURL param? |
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* |
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* @return bool |
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*/ |
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public function existsInReferer() |
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{ |
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return $this->parameterBackURL !== null; |
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} |
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public function reloadRequired() |
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{ |
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return $this->parameterProvided() && !$this->tokenProvided(); |
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} |
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public function reloadRequiredIfError() |
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{ |
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// Don't reload if token exists |
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return $this->reloadRequired() || $this->existsInReferer(); |
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} |
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public function suppress() |
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{ |
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unset($_GET[$this->parameterName]); |
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$this->request->offsetUnset($this->parameterName); |
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} |
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public function params($includeToken = true) |
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{ |
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$params = array( |
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$this->parameterName => $this->parameter, |
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); |
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if ($includeToken) { |
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$params[$this->parameterName . 'token'] = $this->genToken(); |
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} |
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return $params; |
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} |
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public function getRedirectUrlBase() |
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{ |
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return ($this->existsInReferer() && !$this->parameterProvided()) ? Director::baseURL() : $this->currentURL(); |
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} |
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public function getRedirectUrlParams() |
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{ |
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return ($this->existsInReferer() && !$this->parameterProvided()) |
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? $this->params() |
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: array_merge($this->request->getVars(), $this->params()); |
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} |
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protected function redirectURL() |
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{ |
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$query = http_build_query($this->getRedirectUrlParams()); |
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return Controller::join_links($this->getRedirectUrlBase(), '?' . $query); |
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} |
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} |
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silverstripe /
silverstripe-framework
