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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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* Used to update the host used for S3 requests in the case of using a
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* "bucket endpoint" or CNAME bucket.
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*
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* IMPORTANT: this middleware must be added after the "build" step.
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*
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* @internal
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*/
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class BucketEndpointMiddleware
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{
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private static $exclusions = ['GetBucketLocation' => true];
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private $nextHandler;
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/**
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* Create a middleware wrapper function.
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*
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* @return callable
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*/
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public static function wrap()
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{
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return function (callable $handler) {
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return new self($handler);
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};
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}
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public function __construct(callable $nextHandler)
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{
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$this->nextHandler = $nextHandler;
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}
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public function __invoke(CommandInterface $command, RequestInterface $request)
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{
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$nextHandler = $this->nextHandler;
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$bucket = $command['Bucket'];
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if ($bucket && !isset(self::$exclusions[$command->getName()])) {
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$request = $this->modifyRequest($request, $command);
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}
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return $nextHandler($command, $request);
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}
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/**
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* Performs a one-time removal of Bucket from path, then if
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* the bucket name is duplicated in the path, performs additional
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* removal which is dependent on the number of occurrences of the bucket
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* name in a path-like format in the key name.
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*
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* @return string
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*/
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private function removeBucketFromPath($path, $bucket, $key)
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{
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$occurrencesInKey = $this->getBucketNameOccurrencesInKey($key, $bucket);
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do {
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$len = strlen($bucket) + 1;
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if (substr($path, 0, $len) === "/{$bucket}") {
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$path = substr($path, $len);
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}
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} while (substr_count($path, "/{$bucket}") > $occurrencesInKey + 1);
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return $path ?: '/';
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}
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private function removeDuplicateBucketFromHost($host, $bucket)
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{
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if (substr_count($host, $bucket) > 1) {
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while (strpos($host, "{$bucket}.{$bucket}") === 0) {
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$hostArr = explode('.', $host);
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array_shift($hostArr);
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$host = implode('.', $hostArr);
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}
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}
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return $host;
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}
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private function getBucketNameOccurrencesInKey($key, $bucket)
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{
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$occurrences = 0;
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if (empty($key)) {
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return $occurrences;
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}
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$segments = explode('/', $key);
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foreach($segments as $segment) {
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if (strpos($segment, $bucket) === 0) {
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$occurrences++;
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}
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}
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return $occurrences;
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}
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private function modifyRequest(
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RequestInterface $request,
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CommandInterface $command
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) {
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$key = isset($command['Key']) ? $command['Key'] : null;
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$uri = $request->getUri();
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$path = $uri->getPath();
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$host = $uri->getHost();
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$bucket = $command['Bucket'];
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$path = $this->removeBucketFromPath($path, $bucket, $key);
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$host = $this->removeDuplicateBucketFromHost($host, $bucket);
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// Modify the Key to make sure the key is encoded, but slashes are not.
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if ($key) {
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$path = S3Client::encodeKey(rawurldecode($path));
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}
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return $request->withUri(
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$uri->withHost($host)
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->withPath($path)
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);
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}
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}
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