<?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, $request);
}
private function removeBucketFromPath($path, $bucket)
{
$len = strlen($bucket) + 1;
if (substr($path, 0, $len) === "/{$bucket}") {
$path = substr($path, $len);
}
return $path ?: '/';
}
private function modifyRequest(
RequestInterface $request,
CommandInterface $command
) {
$uri = $request->getUri();
$path = $uri->getPath();
$bucket = $command['Bucket'];
$path = $this->removeBucketFromPath($path, $bucket);
// Modify the Key to make sure the key is encoded, but slashes are not.
if ($command['Key']) {
$path = S3Client::encodeKey(rawurldecode($path));
}
return $request->withUri($uri->withPath($path));
}
}
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