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<?php namespace Aws\S3; use Aws\CommandInterface; 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; } if ($accelerate && $this->canAccelerate($command)) { return self::ACCELERATE; } if ($dualStack) { return self::DUALSTACK; } if (!$pathStyle && self::isRequestHostStyleCompatible($command, $request) ) { return self::HOST_STYLE; } 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) ?: '/'; } }
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