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<?php |
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namespace SilverStripe\Control\Middleware\ConfirmationMiddleware; |
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use SilverStripe\Control\HTTPRequest; |
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use SilverStripe\Security\Confirmation; |
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/** |
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* A rule to match a particular URL |
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*/ |
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class Url implements Rule, Bypass |
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{ |
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use PathAware; |
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/** |
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* The HTTP methods |
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* |
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* @var HttpMethodBypass |
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*/ |
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private $httpMethods; |
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/** |
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* The list of GET parameters URL should have to match |
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* |
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* @var array keys are parameter names, values are strings to match or null if any |
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*/ |
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private $params = null; |
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/** |
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* Initialize the rule with the parameters |
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* |
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* @param string $path url path to check for |
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* @param string[]|string|null $httpMethods to match against |
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* @param string[]|null $params a list of GET parameters |
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*/ |
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public function __construct($path, $httpMethods = null, $params = null) |
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{ |
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$this->setPath($path); |
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$this->setParams($params); |
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$this->httpMethods = new HttpMethodBypass(); |
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if (is_array($httpMethods)) { |
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$this->addHttpMethods(...$httpMethods); |
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} elseif (!is_null($httpMethods)) { |
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$this->addHttpMethods($httpMethods); |
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} |
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} |
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/** |
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* Add HTTP methods to check against |
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* |
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* @param string[] ...$methods |
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* |
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* @return $this |
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*/ |
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public function addHttpMethods(...$methods) |
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{ |
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$this->httpMethods->addMethods(...$methods); |
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return $this; |
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} |
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/** |
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* Returns HTTP methods to be checked |
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* |
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* @return string[] |
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*/ |
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public function getHttpMethods() |
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{ |
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return $this->httpMethods->getMethods(); |
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} |
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/** |
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* Set the GET parameters |
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* null to skip parameter check |
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* |
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* If an array of parameters provided, |
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* then URL should contain ALL of them and |
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* ONLY them to match. If the values in the list |
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* contain strings, those will be checked |
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* against parameter values accordingly. Null |
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* as a value in the array matches any parameter values. |
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* |
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* @param string|null $httpMethods |
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* |
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* @return $this |
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*/ |
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public function setParams($params = null) |
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{ |
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$this->params = $params; |
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return $this; |
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} |
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public function checkRequestForBypass(HTTPRequest $request) |
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{ |
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return $this->checkRequest($request); |
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} |
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public function getRequestConfirmationItem(HTTPRequest $request) |
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{ |
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if (!$this->checkRequest($request)) { |
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return null; |
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} |
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$fullPath = $request->getURL(true); |
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$token = $this->generateToken($request->httpMethod(), $fullPath); |
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return $this->buildConfirmationItem($token, $fullPath); |
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} |
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/** |
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* Match the request against the rules |
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* |
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* @param HTTPRequest $request |
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* |
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* @return bool |
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*/ |
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public function checkRequest(HTTPRequest $request) |
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{ |
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$httpMethods = $this->getHttpMethods(); |
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if (count($httpMethods) && !in_array($request->httpMethod(), $httpMethods, true)) { |
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return false; |
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} |
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if (!$this->checkPath($request->getURL())) { |
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return false; |
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} |
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if (!is_null($this->params)) { |
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$getVars = $request->getVars(); |
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// compare the request parameters with the declared ones |
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foreach ($this->params as $key => $val) { |
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if (is_null($val)) { |
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$cmp = array_key_exists($key, $getVars); |
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} else { |
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$cmp = isset($getVars[$key]) && $getVars[$key] === strval($val); |
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} |
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if (!$cmp) { |
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return false; |
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} |
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} |
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// check only declared parameters exist in the request |
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foreach ($getVars as $key => $val) { |
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if (!array_key_exists($key, $this->params)) { |
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return false; |
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} |
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} |
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} |
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return true; |
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} |
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/** |
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* Checks the given path by the rules and |
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* returns true if it is matching |
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* |
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* @param string $path Path to be checked |
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* |
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* @return bool |
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*/ |
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protected function checkPath($path) |
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{ |
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return $this->getPath() === $this->normalisePath($path); |
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} |
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/** |
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* Generates the confirmation item |
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* |
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* @param string $token |
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* @param string $url |
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* |
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* @return Confirmation\Item |
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*/ |
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protected function buildConfirmationItem($token, $url) |
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{ |
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return new Confirmation\Item( |
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$token, |
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_t(__CLASS__.'.CONFIRMATION_NAME', 'URL is protected'), |
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_t(__CLASS__.'.CONFIRMATION_DESCRIPTION', 'The URL is: "{url}"', ['url' => $url]) |
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); |
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} |
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/** |
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* Generates the unique token depending on the path |
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* |
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* @param string $path URL path |
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* |
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* @return string |
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*/ |
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protected function generateToken($httpMethod, $path) |
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{ |
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return sprintf('%s::%s|%s', static::class, $httpMethod, $path); |
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} |
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} |
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