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<?php |
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declare(strict_types=1); |
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namespace Shlinkio\Shlink\Rest\Middleware\ShortUrl; |
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use Laminas\Diactoros\Response; |
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use Laminas\Diactoros\Response\JsonResponse; |
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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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use function array_shift; |
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use function explode; |
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use function strpos; |
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use function strtolower; |
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class CreateShortUrlContentNegotiationMiddleware implements MiddlewareInterface |
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{ |
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private const PLAIN_TEXT = 'text'; |
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private const JSON = 'json'; |
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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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// If the response is not JSON, return it as is |
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if (! $response instanceof JsonResponse) { |
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return $response; |
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} |
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$query = $request->getQueryParams(); |
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$acceptedType = isset($query['format']) |
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? $this->determineAcceptTypeFromQuery($query) |
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: $this->determineAcceptTypeFromHeader($request->getHeaderLine('Accept')); |
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// If JSON was requested, return the response from next handler as is |
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if ($acceptedType === self::JSON) { |
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return $response; |
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} |
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// If requested, return a plain text response containing the short URL only |
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$resp = (new Response())->withHeader('Content-Type', 'text/plain'); |
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$body = $resp->getBody(); |
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$body->write($this->determineBody($response)); |
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$body->rewind(); |
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return $resp; |
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} |
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private function determineAcceptTypeFromQuery(array $query): string |
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{ |
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if (! isset($query['format'])) { |
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return self::JSON; |
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} |
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$format = strtolower($query['format']); |
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return $format === 'txt' ? self::PLAIN_TEXT : self::JSON; |
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} |
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private function determineAcceptTypeFromHeader(string $acceptValue): string |
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{ |
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$accepts = explode(',', $acceptValue); |
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$accept = strtolower(array_shift($accepts)); |
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return strpos($accept, 'text/plain') !== false ? self::PLAIN_TEXT : self::JSON; |
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} |
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private function determineBody(JsonResponse $resp): string |
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{ |
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$payload = $resp->getPayload(); |
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return $payload['shortUrl'] ?? $payload['error'] ?? ''; |
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} |
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} |
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shlinkio /
shlink
