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<?php declare(strict_types=1); |
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/* |
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* This file is part of coisa/http. |
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* |
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* (c) Felipe Sayão Lobato Abreu <[email protected]> |
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* |
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* This source file is subject to the license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace CoiSA\Http\Middleware; |
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use CoiSA\Http\Message\StreamFactory; |
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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\Message\StreamFactoryInterface; |
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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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* Class JsonpCallbackMiddleware |
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* |
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* @package CoiSA\Http\Middleware |
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*/ |
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final class JsonpCallbackMiddleware implements MiddlewareInterface |
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{ |
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/** |
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* @const string |
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*/ |
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const REQUEST_QUERY_PARAM = 'callback'; |
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/** |
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* @const string |
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*/ |
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const REQUEST_ACCEPT_HEADER = 'text/javascript'; |
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/** |
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* @var string |
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*/ |
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private $queryParam; |
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/** |
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* @var StreamFactoryInterface |
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*/ |
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private $streamFactory; |
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/** |
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* JsonpCallbackMiddleware constructor. |
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* |
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* @param string $queryParam |
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* @param StreamFactoryInterface|null $streamFactory |
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*/ |
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public function __construct(string $queryParam = self::REQUEST_QUERY_PARAM, StreamFactoryInterface $streamFactory = null) |
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{ |
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$this->queryParam = $queryParam; |
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$this->streamFactory = $streamFactory ?? new StreamFactory(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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$response = $handler->handle($request); |
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$callback = $request->getQueryParams()[$this->queryParam] ?? false; |
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if (!$callback) { |
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return $response; |
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} |
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if ($request->hasHeader('Accept') |
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&& !in_array(self::REQUEST_ACCEPT_HEADER, $request->getHeader('Accept')) |
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) { |
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return $response; |
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} |
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// @TODO accept all types of json content-type ['application/json', 'text/json', 'application/x-json']; |
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if ($response->hasHeader('Content-Type') |
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&& !in_array('application/json', $response->getHeader('Content-Type')) |
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) { |
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return $response; |
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} |
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$content = \htmlspecialchars($callback) . '(' . $response->getBody() . ');'; |
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$body = $this->streamFactory->createStream($content); |
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return $response |
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->withHeader('Content-Type', 'text/javascript') |
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->withBody($body); |
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} |
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} |
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coisa /
http
