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<?php |
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namespace Dudlewebs\WPMCS\s3\Aws\S3; |
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|
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use Dudlewebs\WPMCS\s3\Aws\CommandInterface; |
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use Dudlewebs\WPMCS\s3\Psr\Http\Message\RequestInterface; |
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/** |
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* Simplifies the SSE-C process by encoding and hashing the key. |
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* @internal |
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*/ |
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class SSECMiddleware |
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{ |
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private $endpointScheme; |
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private $nextHandler; |
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/** |
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* Provide the URI scheme of the client sending requests. |
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* |
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* @param string $endpointScheme URI scheme (http/https). |
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* |
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* @return callable |
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*/ |
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public static function wrap($endpointScheme) |
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{ |
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return function (callable $handler) use($endpointScheme) { |
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return new self($endpointScheme, $handler); |
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}; |
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} |
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public function __construct($endpointScheme, callable $nextHandler) |
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{ |
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$this->nextHandler = $nextHandler; |
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$this->endpointScheme = $endpointScheme; |
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} |
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public function __invoke(CommandInterface $command, RequestInterface $request = null) |
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{ |
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// Allows only HTTPS connections when using SSE-C |
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if (($command['SSECustomerKey'] || $command['CopySourceSSECustomerKey']) && $this->endpointScheme !== 'https') { |
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throw new \RuntimeException('You must configure your S3 client to ' . 'use HTTPS in order to use the SSE-C features.'); |
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} |
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// Prepare the normal SSE-CPK headers |
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if ($command['SSECustomerKey']) { |
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$this->prepareSseParams($command); |
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} |
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// If it's a copy operation, prepare the SSE-CPK headers for the source. |
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if ($command['CopySourceSSECustomerKey']) { |
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$this->prepareSseParams($command, 'CopySource'); |
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} |
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$f = $this->nextHandler; |
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return $f($command, $request); |
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} |
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private function prepareSseParams(CommandInterface $command, $prefix = '') |
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{ |
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// Base64 encode the provided key |
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$key = $command[$prefix . 'SSECustomerKey']; |
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$command[$prefix . 'SSECustomerKey'] = \base64_encode($key); |
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// Base64 the provided MD5 or, generate an MD5 if not provided |
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if ($md5 = $command[$prefix . 'SSECustomerKeyMD5']) { |
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$command[$prefix . 'SSECustomerKeyMD5'] = \base64_encode($md5); |
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} else { |
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$command[$prefix . 'SSECustomerKeyMD5'] = \base64_encode(\md5($key, \true)); |
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} |
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} |
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} |
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