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efrain |
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<?php
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namespace Aws\S3;
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use Aws\CommandInterface;
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use 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(
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CommandInterface $command,
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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'])
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&& $this->endpointScheme !== 'https'
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) {
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throw new \RuntimeException('You must configure your S3 client to '
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. 'use HTTPS in order to use the SSE-C features.');
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}
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// Prepare the normal SSE-CPK headers
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if ($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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