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<?php |
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namespace Psr7Middlewares\Middleware; |
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use JsonSchema\Validator; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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class JsonValidator |
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{ |
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/** @var \stdClass */ |
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private $schema; |
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/** |
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* JsonSchema constructor. |
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* Consider using one of the following factories instead of invoking the controller directly: |
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* - JsonValidator::fromFile() |
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* - JsonValidator::fromEncodedString() |
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* - JsonValidator::fromDecodedObject() |
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* - JsonValidator::fromArray() |
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* |
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* @param \stdClass $schema A JSON-decoded object-representation of the schema. |
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*/ |
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public function __construct(\stdClass $schema) |
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{ |
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$this->schema = $schema; |
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} |
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/** |
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* @param \stdClass $schema |
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* @return static|callable |
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*/ |
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public static function fromDecodedObject(\stdClass $schema) |
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{ |
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return new static($schema); |
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} |
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/** |
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* @param \SplFileObject $file |
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* @return static|callable |
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*/ |
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public static function fromFile(\SplFileObject $file) |
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{ |
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$schema = (object)[ |
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'$ref' => $file->getPathname(), |
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]; |
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return new static($schema); |
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} |
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/** |
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* @param string $json |
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* @return static|callable |
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*/ |
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public static function fromEncodedString($json) |
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{ |
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return static::fromDecodedObject(json_decode($json, false)); |
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} |
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/** |
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* @param array $json |
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* @return static|callable |
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*/ |
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public static function fromArray(array $json) |
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{ |
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return static::fromEncodedString(json_encode($json, JSON_UNESCAPED_SLASHES)); |
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} |
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/** |
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* Execute the middleware. |
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* |
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* @param ServerRequestInterface $request |
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* @param ResponseInterface $response |
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* @param callable $next |
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* |
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* @return ResponseInterface |
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* @throws \RuntimeException |
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* @throws \InvalidArgumentException |
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* @throws \JsonSchema\Exception\ExceptionInterface |
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*/ |
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public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next) |
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{ |
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$value = $request->getParsedBody(); |
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if (!is_object($value)) { |
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return $this->invalidateResponse( |
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$response, |
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sprintf('Parsed body must be an object. Type %s is invalid.', gettype($value)) |
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); |
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} |
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$validator = new Validator(); |
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$validator->check($value, $this->schema); |
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if (!$validator->isValid()) { |
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return $this->invalidateResponse( |
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$response, |
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'Unprocessable Entity', |
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[ |
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'Content-Type' => 'application/json', |
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], |
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json_encode($validator->getErrors(), JSON_UNESCAPED_SLASHES) |
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); |
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} |
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return $next($request, $response); |
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} |
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/** |
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* @param ResponseInterface $response |
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* @param string $reason |
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* @param string[] $headers |
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* @param string|null $body |
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* |
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* @return ResponseInterface |
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* @throws \RuntimeException |
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* @throws \InvalidArgumentException |
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*/ |
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private function invalidateResponse(ResponseInterface $response, $reason, array $headers = [], $body = null) |
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{ |
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$response = $response->withStatus(422, $reason); |
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foreach ($headers as $name => $value) { |
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$response = $response->withHeader($name, $value); |
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} |
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if ($body !== null) { |
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$stream = $response->getBody(); |
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$stream->write($body); |
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} |
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return $response; |
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} |
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} |
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oscarotero /
psr7-middlewares
