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<?php /* * This file is part of fruitcake/php-cors and was originally part of asm89/stack-cors * * (c) Alexander <iam.asm89@gmail.com> * (c) Barryvdh <barryvdh@gmail.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. / namespace Fruitcake\Cors; use Fruitcake\Cors\Exceptions\InvalidOptionException; use Symfony\Component\HttpFoundation\Request; use Symfony\Component\HttpFoundation\Response; /* * @phpstan-type CorsInputOptions array{ * 'allowedOrigins'?: string[], * 'allowedOriginsPatterns'?: string[], * 'supportsCredentials'?: bool, * 'allowedHeaders'?: string[], * 'allowedMethods'?: string[], * 'exposedHeaders'?: string[]\|false, * 'maxAge'?: int\|bool\|null, * 'allowed_origins'?: string[], * 'allowed_origins_patterns'?: string[], * 'supports_credentials'?: bool, * 'allowed_headers'?: string[], * 'allowed_methods'?: string[], * 'exposed_headers'?: string[]\|false, * 'max_age'?: int\|bool\|null * } * / class CorsService { /* @var string[] / private array $allowedOrigins = []; /* @var string[] / private array $allowedOriginsPatterns = []; /* @var string[] / private array $allowedMethods = []; /* @var string[] / private array $allowedHeaders = []; /* @var string[] / private array $exposedHeaders = []; private bool $supportsCredentials = false; private ?int $maxAge = 0; private bool $allowAllOrigins = false; private bool $allowAllMethods = false; private bool $allowAllHeaders = false; /* * @param CorsInputOptions $options / public function __construct(array $options = []) { if ($options) { $this->setOptions($options); } } /* * @param CorsInputOptions $options / public function setOptions(array $options): void { $this->allowedOrigins = $options['allowedOrigins'] ?? $options['allowed_origins'] ?? $this->allowedOrigins; $this->allowedOriginsPatterns = $options['allowedOriginsPatterns'] ?? $options['allowed_origins_patterns'] ?? $this->allowedOriginsPatterns; $this->allowedMethods = $options['allowedMethods'] ?? $options['allowed_methods'] ?? $this->allowedMethods; $this->allowedHeaders = $options['allowedHeaders'] ?? $options['allowed_headers'] ?? $this->allowedHeaders; $this->supportsCredentials = $options['supportsCredentials'] ?? $options['supports_credentials'] ?? $this->supportsCredentials; $maxAge = $this->maxAge; if (array_key_exists('maxAge', $options)) { $maxAge = $options['maxAge']; } elseif (array_key_exists('max_age', $options)) { $maxAge = $options['max_age']; } $this->maxAge = $maxAge === null ? null : (int)$maxAge; $exposedHeaders = $options['exposedHeaders'] ?? $options['exposed_headers'] ?? $this->exposedHeaders; $this->exposedHeaders = $exposedHeaders === false ? [] : $exposedHeaders; $this->normalizeOptions(); } private function normalizeOptions(): void { // Normalize case $this->allowedHeaders = array_map('strtolower', $this->allowedHeaders); $this->allowedMethods = array_map('strtoupper', $this->allowedMethods); // Normalize [''] to true $this->allowAllOrigins = in_array('', $this->allowedOrigins); $this->allowAllHeaders = in_array('', $this->allowedHeaders); $this->allowAllMethods = in_array('', $this->allowedMethods); // Transform wildcard pattern if (!$this->allowAllOrigins) { foreach ($this->allowedOrigins as $origin) { if (strpos($origin, '') !== false) { $this->allowedOriginsPatterns[] = $this->convertWildcardToPattern($origin); } } } } /** * Create a pattern for a wildcard, based on Str::is() from Laravel * * @see https://github.com/laravel/framework/blob/5.5/src/Illuminate/Support/Str.php * @param string $pattern * @return string / private function convertWildcardToPattern($pattern) { $pattern = preg_quote($pattern, '#'); // Asterisks are translated into zero-or-more regular expression wildcards // to make it convenient to check if the strings starts with the given // pattern such as ".example.com", making any string check convenient. $pattern = str_replace('\', '.', $pattern); return '#^' . $pattern . '\z#u'; } public function isCorsRequest(Request $request): bool { return $request->headers->has('Origin'); } public function isPreflightRequest(Request $request): bool { return $request->getMethod() === 'OPTIONS' && $request->headers->has('Access-Control-Request-Method'); } public function handlePreflightRequest(Request $request): Response { $response = new Response(); $response->setStatusCode(204); return $this->addPreflightRequestHeaders($response, $request); } public function addPreflightRequestHeaders(Response $response, Request $request): Response { $this->configureAllowedOrigin($response, $request); if ($response->headers->has('Access-Control-Allow-Origin')) { $this->configureAllowCredentials($response, $request); $this->configureAllowedMethods($response, $request); $this->configureAllowedHeaders($response, $request); $this->configureMaxAge($response, $request); } return $response; } public function isOriginAllowed(Request $request): bool { if ($this->allowAllOrigins === true) { return true; } $origin = (string) $request->headers->get('Origin'); if (in_array($origin, $this->allowedOrigins)) { return true; } foreach ($this->allowedOriginsPatterns as $pattern) { if (preg_match($pattern, $origin)) { return true; } } return false; } public function addActualRequestHeaders(Response $response, Request $request): Response { $this->configureAllowedOrigin($response, $request); if ($response->headers->has('Access-Control-Allow-Origin')) { $this->configureAllowCredentials($response, $request); $this->configureExposedHeaders($response, $request); } return $response; } private function configureAllowedOrigin(Response $response, Request $request): void { if ($this->allowAllOrigins === true && !$this->supportsCredentials) { // Safe+cacheable, allow everything $response->headers->set('Access-Control-Allow-Origin', '*'); } elseif ($this->isSingleOriginAllowed()) { // Single origins can be safely set $response->headers->set('Access-Control-Allow-Origin', array_values($this->allowedOrigins)[0]); } else { // For dynamic headers, set the requested Origin header when set and allowed if ($this->isCorsRequest($request) && $this->isOriginAllowed($request)) { $response->headers->set('Access-Control-Allow-Origin', (string) $request->headers->get('Origin')); } $this->varyHeader($response, 'Origin'); } } private function isSingleOriginAllowed(): bool { if ($this->allowAllOrigins === true \|\| count($this->allowedOriginsPatterns) > 0) { return false; } return count($this->allowedOrigins) === 1; } private function configureAllowedMethods(Response $response, Request $request): void { if ($this->allowAllMethods === true) { $allowMethods = strtoupper((string) $request->headers->get('Access-Control-Request-Method')); $this->varyHeader($response, 'Access-Control-Request-Method'); } else { $allowMethods = implode(', ', $this->allowedMethods); } $response->headers->set('Access-Control-Allow-Methods', $allowMethods); } private function configureAllowedHeaders(Response $response, Request $request): void { if ($this->allowAllHeaders === true) { $allowHeaders = (string) $request->headers->get('Access-Control-Request-Headers'); $this->varyHeader($response, 'Access-Control-Request-Headers'); } else { $allowHeaders = implode(', ', $this->allowedHeaders); } $response->headers->set('Access-Control-Allow-Headers', $allowHeaders); } private function configureAllowCredentials(Response $response, Request $request): void { if ($this->supportsCredentials) { $response->headers->set('Access-Control-Allow-Credentials', 'true'); } } private function configureExposedHeaders(Response $response, Request $request): void { if ($this->exposedHeaders) { $response->headers->set('Access-Control-Expose-Headers', implode(', ', $this->exposedHeaders)); } } private function configureMaxAge(Response $response, Request $request): void { if ($this->maxAge !== null) { $response->headers->set('Access-Control-Max-Age', (string) $this->maxAge); } } public function varyHeader(Response $response, string $header): Response { if (!$response->headers->has('Vary')) { $response->headers->set('Vary', $header); } elseif (!in_array($header, explode(', ', (string) $response->headers->get('Vary')))) { $response->headers->set('Vary', ((string) $response->headers->get('Vary')) . ', ' . $header); } return $response; } }