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<?php |
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namespace JDesrosiers\Silex\Provider; |
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use Silex\Application; |
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use Symfony\Component\HttpFoundation\Request; |
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use Symfony\Component\HttpFoundation\Response; |
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class Cors |
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{ |
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private $options; |
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public function __construct($options = []) |
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{ |
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$this->options = $options; |
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} |
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public function __invoke(Request $request, Response $response, Application $app) |
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{ |
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$defaults = [ |
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"allowOrigin" => $app["cors.allowOrigin"], |
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"allowMethods" => $app["cors.allowMethods"], |
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"allowHeaders" => $app["cors.allowHeaders"], |
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"maxAge" => $app["cors.maxAge"], |
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"allowCredentials" => $app["cors.allowCredentials"], |
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"exposeHeaders" => $app["cors.exposeHeaders"] |
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]; |
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$cors = new Cors($this->options + $defaults); |
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$cors->cors($request, $response); |
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} |
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private function cors(Request $request, Response $response) |
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{ |
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$headers = []; |
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if (!$this->isCorsRequest($request)) { |
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return []; |
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} |
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if ($this->isPreflightRequest($request)) { |
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$requestMethod = $request->headers->get("Access-Control-Request-Method"); |
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$allow = $response->headers->get("Allow"); |
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if (!$this->isMethodAllowed($requestMethod, $allow)) { |
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return []; |
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} |
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$requestHeaders = $request->headers->get("Access-Control-Request-Headers"); |
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if (!$this->areHeadersAllowed($requestHeaders)) { |
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return []; |
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} |
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$headers["Access-Control-Allow-Headers"] = $requestHeaders; |
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$headers["Access-Control-Allow-Methods"] = $requestMethod; |
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$headers["Access-Control-Max-Age"] = $this->options["maxAge"]; |
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} else { |
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$headers["Access-Control-Expose-Headers"] = $this->options["exposeHeaders"]; |
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} |
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$headers["Access-Control-Allow-Origin"] = $this->allowOrigin($request); |
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$headers["Access-Control-Allow-Credentials"] = $this->allowCredentials(); |
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$response->headers->add(array_filter($headers)); |
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} |
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private function isCorsRequest(Request $request) |
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{ |
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return $request->headers->has("Origin"); |
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} |
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private function isPreflightRequest(Request $request) |
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{ |
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return $request->getMethod() === "OPTIONS" && $request->headers->has("Access-Control-Request-Method"); |
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} |
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private function isMethodAllowed($requestMethod, $allow) |
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{ |
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$commaSeparatedMethods = !is_null($this->options["allowMethods"]) ? $this->options["allowMethods"] : $allow; |
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$allowedMethods = array_filter(preg_split("/\s*,\s*/", $commaSeparatedMethods)); |
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return in_array($requestMethod, $allowedMethods); |
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} |
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private function areHeadersAllowed($commaSeparatedRequestHeaders) |
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{ |
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if ($this->options["allowHeaders"] === null) { |
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return true; |
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} |
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$requestHeaders = array_filter(preg_split("/\s*,\s*/", $commaSeparatedRequestHeaders)); |
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$allowedHeaders = array_filter(preg_split("/\s*,\s*/", $this->options["allowHeaders"])); |
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return array_diff($requestHeaders, $allowedHeaders) === []; |
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} |
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private function allowOrigin(Request $request) |
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{ |
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$origin = $request->headers->get("Origin"); |
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if ($this->options["allowOrigin"] === "*") { |
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$this->options["allowOrigin"] = $origin; |
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} |
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$origins = array_filter(preg_split('/\s+/', $this->options["allowOrigin"])); |
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foreach ($origins as $domain) { |
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if (preg_match($this->domainToRegex($domain), $origin)) { |
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return $origin; |
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} |
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} |
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return "null"; |
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} |
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private function domainToRegex($domain) |
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{ |
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return "/^" . preg_replace("/^\\\\\*/", "[^.]+", preg_quote($domain, "/")) . "$/"; |
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} |
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private function allowCredentials() |
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{ |
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return $this->options["allowCredentials"] === true ? "true" : null; |
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} |
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} |
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jdesrosiers /
silex-cors-provider
