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<?php |
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namespace Psr7Middlewares\Middleware; |
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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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/** @var callable|null */ |
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private $errorHandler; |
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/** |
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* JsonSchema constructor. |
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* |
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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 ($schema instanceof \SplFileObject) { |
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$validator = JsonValidator::fromFile($schema); |
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if (is_callable($this->errorHandler)) { |
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$validator->errorHandler($this->errorHandler); |
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} |
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return $validator($request, $response, $next); |
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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 ServerRequestInterface $request |
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* |
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* @return \SplFileObject|null |
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*/ |
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private function getSchema(ServerRequestInterface $request) |
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{ |
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$uri = $request->getUri(); |
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$path = $uri->getPath(); |
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foreach ($this->schemas as $pattern => $file) { |
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if (stripos($path, $pattern) === 0) { |
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return new \SplFileObject($this->normalizeFilePath($file)); |
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} |
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} |
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return null; |
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} |
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/** |
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* @param string |
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* |
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* @return string |
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*/ |
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private function normalizeFilePath($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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* Has the following method signature: |
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* function (ServerRequestInterface $request, ResponseInterface $response): ResponseInterface {} |
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* |
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* Validation errors are stored in a middleware attribute: |
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* $request->getAttribute(Middleware::KEY, [])[JsonValidator::KEY]; |
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* |
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* @param callable $errorHandler |
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* @return void |
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*/ |
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public function errorHandler(callable $errorHandler) |
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{ |
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$this->errorHandler = $errorHandler; |
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} |
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} |
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oscarotero /
psr7-middlewares
