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<?php |
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declare(strict_types=1); |
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namespace Ecodev\Felix\Middleware; |
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use Cake\Chronos\Chronos; |
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use Exception; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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/** |
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* Validate that the GraphQL query contains a valid signature in the `Authorization` HTTP header. |
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* |
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* The signature payload is the GraphQL operation (or operations in case of batching). That means that the query itself |
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* and the variables are signed. But it specifically does **not** include uploaded files. |
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* |
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* The signature is valid for a limited time only, ~15 minutes. |
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* |
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* The signature syntax is: |
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* |
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* ```ebnf |
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* signature = "v1", ".", timestamp, ".", hash |
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* timestamp = current unix time |
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* hash = HMAC_SHA256( payload ) |
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* payload = timestamp, graphql operations |
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* ``` |
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*/ |
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final class SignedQueryMiddleware implements MiddlewareInterface |
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{ |
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public function __construct(private readonly array $keys, private readonly bool $required = true) |
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{ |
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if ($this->required && !$this->keys) { |
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throw new Exception('Signed queries are required, but no keys are configured'); |
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} |
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} |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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if ($this->required) { |
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$this->verify($request); |
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} |
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return $handler->handle($request); |
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} |
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private function verify(ServerRequestInterface $request): void |
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{ |
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$autorization = $request->getHeader('authorization')[0] ?? ''; |
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if (!$autorization) { |
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throw new Exception('Missing `Authorization` HTTP header in signed query'); |
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} |
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if (preg_match('~^v1\.(?<timestamp>\d{10})\.(?<hash>[0-9a-f]{64})$~', $autorization, $m)) { |
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$timestamp = $m['timestamp']; |
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$hash = $m['hash']; |
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$this->verifyTimestamp($timestamp); |
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$this->verifyHash($request, $timestamp, $hash); |
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} else { |
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throw new Exception('Invalid `Authorization` HTTP header in signed query'); |
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} |
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} |
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private function verifyTimestamp(string $timestamp): void |
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{ |
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$now = Chronos::now()->timestamp; |
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$leeway = 15 * 900; // 15 minutes |
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$past = $now - $leeway; |
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$future = $now + $leeway; |
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if ($timestamp < $past || $timestamp > $future) { |
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throw new Exception('Signed query is expired'); |
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} |
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} |
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private function verifyHash(ServerRequestInterface $request, string $timestamp, string $hash): void |
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{ |
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$operations = $this->getOperations($request); |
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$payload = $timestamp . $operations; |
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foreach ($this->keys as $key) { |
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$computedHash = hash_hmac('sha256', $payload, $key); |
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if ($hash === $computedHash) { |
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return; |
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} |
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} |
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throw new Exception('Invalid signed query'); |
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} |
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private function getOperations(ServerRequestInterface $request): mixed |
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{ |
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$contents = $request->getBody()->getContents(); |
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if ($contents) { |
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return $contents; |
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} |
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$parsedBody = $request->getParsedBody(); |
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if (is_array($parsedBody)) { |
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$operations = $parsedBody['operations'] ?? null; |
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if ($operations) { |
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return $operations; |
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} |
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} |
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throw new Exception('Could not find GraphQL operations in request'); |
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} |
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} |
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Ecodev /
felix
