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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 JsonSchema |
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{ |
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/** @var string[] */ |
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private $schemas; |
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/** |
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* JsonSchema constructor. |
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* @param string[] $schemas [uri => file] An associative array of HTTP URI to validation schema. |
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*/ |
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public function __construct(array $schemas) |
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{ |
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$this->schemas = $schemas; |
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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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*/ |
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public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next) |
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{ |
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$schema = $this->getSchema($request); |
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if (is_object($schema)) { |
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$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, $schema); |
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if (!$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($validator->getErrors(), JSON_UNESCAPED_SLASHES) |
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); |
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} |
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} |
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if ($next) { |
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return $next($request, $response); |
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} |
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return $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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* @return ResponseInterface |
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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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* @param ServerRequestInterface $request |
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* @return object|null |
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*/ |
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private function getSchema(ServerRequestInterface $request) |
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{ |
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foreach ($this->schemas as $pattern => $file) { |
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$uri = $request->getUri(); |
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$path = $uri->getPath(); |
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if (stripos($path, $pattern) === 0) { |
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$file = $this->normalizeFilePath($file); |
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return (object) [ |
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'$ref' => $file, |
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]; |
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} |
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} |
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return null; |
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} |
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/** |
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* @param string |
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* @return string |
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*/ |
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private function normalizeFilePath($path) |
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{ |
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if (parse_url($path, PHP_URL_SCHEME)) { |
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// The schema file already has a scheme, e.g. `file://` or `vfs://`. |
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return $path; |
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} |
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return 'file://' . $path; |
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} |
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} |
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oscarotero /
psr7-middlewares
