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<?php |
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declare(strict_types=1); |
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namespace GraphQL\Upload; |
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use GraphQL\Error\InvariantViolation; |
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use GraphQL\Server\RequestError; |
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use GraphQL\Utils\Utils; |
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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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class UploadMiddleware implements MiddlewareInterface |
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{ |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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$request = $this->processRequest($request); |
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return $handler->handle($request); |
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} |
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/** |
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* Process the request and return either a modified request or the original one. |
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*/ |
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public function processRequest(ServerRequestInterface $request): ServerRequestInterface |
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{ |
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$contentType = $request->getHeader('content-type')[0] ?? ''; |
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if (mb_stripos($contentType, 'multipart/form-data') !== false) { |
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$this->validateParsedBody($request); |
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$request = $this->parseUploadedFiles($request); |
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} |
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return $request; |
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} |
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/** |
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* Inject uploaded files defined in the 'map' key into the 'variables' key. |
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*/ |
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private function parseUploadedFiles(ServerRequestInterface $request): ServerRequestInterface |
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{ |
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/** @var string[] $bodyParams */ |
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$bodyParams = $request->getParsedBody(); |
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$map = $this->decodeArray($bodyParams, 'map'); |
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$result = $this->decodeArray($bodyParams, 'operations'); |
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foreach ($map as $fileKey => $locations) { |
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foreach ($locations as $location) { |
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$items = &$result; |
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foreach (explode('.', $location) as $key) { |
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if (!isset($items[$key]) || !is_array($items[$key])) { |
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$items[$key] = []; |
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} |
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$items = &$items[$key]; |
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} |
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$items = $request->getUploadedFiles()[$fileKey]; |
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} |
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} |
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return $request |
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->withHeader('content-type', 'application/json') |
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->withParsedBody($result); |
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} |
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/** |
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* Validates that the request meet our expectations. |
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*/ |
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private function validateParsedBody(ServerRequestInterface $request): void |
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{ |
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$bodyParams = $request->getParsedBody(); |
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if (null === $bodyParams) { |
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throw new InvariantViolation( |
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'PSR-7 request is expected to provide parsed body for "multipart/form-data" requests but got null' |
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); |
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} |
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if (!is_array($bodyParams)) { |
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throw new RequestError( |
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'GraphQL Server expects JSON object or array, but got ' . Utils::printSafeJson($bodyParams) |
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); |
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} |
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if (empty($bodyParams)) { |
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throw new InvariantViolation( |
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'PSR-7 request is expected to provide parsed body for "multipart/form-data" requests but got empty array' |
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); |
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} |
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} |
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/** |
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* @param string[] $bodyParams |
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* |
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* @return string[][] |
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*/ |
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private function decodeArray(array $bodyParams, string $key): array |
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{ |
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if (!isset($bodyParams[$key])) { |
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throw new RequestError("The request must define a `$key`"); |
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} |
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$value = json_decode($bodyParams[$key], true); |
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if (!is_array($value)) { |
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throw new RequestError("The `$key` key must be a JSON encoded array"); |
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} |
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return $value; |
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} |
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} |
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Ecodev /
graphql-upload
