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<?php
namespace Aws\S3;
use Aws\CommandInterface;
use Aws\S3\Exception\S3Exception;
use Psr\Http\Message\RequestInterface;
/**
* Used to update the URL used for S3 requests to support:
* S3 Accelerate, S3 DualStack or Both. It will build to
* host style paths unless specified, including for S3
* DualStack.
*
* IMPORTANT: this middleware must be added after the "build" step.
*
* @internal
*/
class S3EndpointMiddleware
{
private static $exclusions = [
'CreateBucket' => true,
'DeleteBucket' => true,
'ListBuckets' => true,
];
const NO_PATTERN = 0;
const DUALSTACK = 1;
const ACCELERATE = 2;
const ACCELERATE_DUALSTACK = 3;
const PATH_STYLE = 4;
const HOST_STYLE = 5;
/** @var bool */
private $accelerateByDefault;
/** @var bool */
private $dualStackByDefault;
/** @var bool */
private $pathStyleByDefault;
/** @var string */
private $region;
/** @var callable */
private $nextHandler;
/**
* Create a middleware wrapper function
*
* @param string $region
* @param array $options
*
* @return callable
*/
public static function wrap($region, array $options)
{
return function (callable $handler) use ($region, $options) {
return new self($handler, $region, $options);
};
}
public function __construct(
callable $nextHandler,
$region,
array $options
) {
$this->pathStyleByDefault = isset($options['path_style'])
? (bool) $options['path_style'] : false;
$this->dualStackByDefault = isset($options['dual_stack'])
? (bool) $options['dual_stack'] : false;
$this->accelerateByDefault = isset($options['accelerate'])
? (bool) $options['accelerate'] : false;
$this->region = (string) $region;
$this->nextHandler = $nextHandler;
}
public function __invoke(CommandInterface $command, RequestInterface $request)
{
switch ($this->endpointPatternDecider($command, $request)) {
case self::HOST_STYLE:
$request = $this->applyHostStyleEndpoint($command, $request);
break;
case self::NO_PATTERN:
case self::PATH_STYLE:
break;
case self::DUALSTACK:
$request = $this->applyDualStackEndpoint($command, $request);
break;
case self::ACCELERATE:
$request = $this->applyAccelerateEndpoint(
$command,
$request,
's3-accelerate'
);
break;
case self::ACCELERATE_DUALSTACK:
$request = $this->applyAccelerateEndpoint(
$command,
$request,
's3-accelerate.dualstack'
);
break;
}
$nextHandler = $this->nextHandler;
return $nextHandler($command, $request);
}
private static function isRequestHostStyleCompatible(
CommandInterface $command,
RequestInterface $request
) {
return S3Client::isBucketDnsCompatible($command['Bucket'])
&& (
$request->getUri()->getScheme() === 'http'
|| strpos($command['Bucket'], '.') === false
);
}
private function endpointPatternDecider(
CommandInterface $command,
RequestInterface $request
) {
$accelerate = isset($command['@use_accelerate_endpoint'])
? $command['@use_accelerate_endpoint'] : $this->accelerateByDefault;
$dualStack = isset($command['@use_dual_stack_endpoint'])
? $command['@use_dual_stack_endpoint'] : $this->dualStackByDefault;
$pathStyle = isset($command['@use_path_style_endpoint'])
? $command['@use_path_style_endpoint'] : $this->pathStyleByDefault;
if ($accelerate && $dualStack) {
// When try to enable both for operations excluded from s3-accelerate,
// only dualstack endpoints will be enabled.
return $this->canAccelerate($command)
? self::ACCELERATE_DUALSTACK
: self::DUALSTACK;
} elseif ($accelerate && $this->canAccelerate($command)) {
return self::ACCELERATE;
} elseif ($dualStack) {
return self::DUALSTACK;
} elseif (!$pathStyle
&& self::isRequestHostStyleCompatible($command, $request)
) {
return self::HOST_STYLE;
} else {
return self::PATH_STYLE;
}
}
private function canAccelerate(CommandInterface $command)
{
return empty(self::$exclusions[$command->getName()])
&& S3Client::isBucketDnsCompatible($command['Bucket']);
}
private function getBucketStyleHost(CommandInterface $command, $host)
{
// For operations on the base host (e.g. ListBuckets)
if (!isset($command['Bucket'])) {
return $host;
}
return "{$command['Bucket']}.{$host}";
}
private function applyHostStyleEndpoint(
CommandInterface $command,
RequestInterface $request
) {
$uri = $request->getUri();
$request = $request->withUri(
$uri->withHost($this->getBucketStyleHost(
$command,
$uri->getHost()
))
->withPath($this->getBucketlessPath(
$uri->getPath(),
$command
))
);
return $request;
}
private function applyDualStackEndpoint(
CommandInterface $command,
RequestInterface $request
) {
$request = $request->withUri(
$request->getUri()
->withHost($this->getDualStackHost())
);
if (empty($command['@use_path_style_endpoint'])
&& !$this->pathStyleByDefault
&& self::isRequestHostStyleCompatible($command, $request)
) {
$request = $this->applyHostStyleEndpoint($command, $request);
}
return $request;
}
private function getDualStackHost()
{
return "s3.dualstack.{$this->region}.amazonaws.com";
}
private function applyAccelerateEndpoint(
CommandInterface $command,
RequestInterface $request,
$pattern
) {
$request = $request->withUri(
$request->getUri()
->withHost($this->getAccelerateHost($command, $pattern))
->withPath($this->getBucketlessPath(
$request->getUri()->getPath(),
$command
))
);
return $request;
}
private function getAccelerateHost(CommandInterface $command, $pattern)
{
return "{$command['Bucket']}.{$pattern}.amazonaws.com";
}
private function getBucketlessPath($path, CommandInterface $command)
{
$pattern = '/^\\/' . preg_quote($command['Bucket'], '/') . '/';
return preg_replace($pattern, '', $path) ?: '/';
}
}