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