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Filename : S3EndpointMiddleware.php
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<?php
namespace Aws\S3;

use Aws\Arn\ArnParser;
use Aws\Arn\ObjectLambdaAccessPointArn;
use Aws\ClientResolver;
use Aws\CommandInterface;
use Aws\Endpoint\EndpointProvider;
use Aws\Endpoint\PartitionEndpointProvider;
use GuzzleHttp\Exception\InvalidArgumentException;
use GuzzleHttp\Psr7\Uri;
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 $endpointProvider;
    /** @var callable */
    private $nextHandler;
    /** @var string */
    private $endpoint;

    /**
     * Create a middleware wrapper function
     *
     * @param string $region
     * @param EndpointProvider $endpointProvider
     * @param array  $options
     *
     * @return callable
     */
    public static function wrap($region, $endpointProvider, array $options)
    {
        return function (callable $handler) use ($region, $endpointProvider, $options) {
            return new self($handler, $region, $options, $endpointProvider);
        };
    }

    public function __construct(
        callable $nextHandler,
        $region,
        array $options,
        $endpointProvider = null
    ) {
        $this->pathStyleByDefault = isset($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;
        $this->endpoint = isset($options['endpoint'])
            ? $options['endpoint'] : "";
        $this->endpointProvider = is_null($endpointProvider)
            ? PartitionEndpointProvider::defaultProvider()
            : $endpointProvider;
        $this->nextHandler = $nextHandler;
    }

    public function __invoke(CommandInterface $command, RequestInterface $request)
    {
        if (!empty($this->endpoint)) {
            $request = $this->applyEndpoint($command, $request);
        } else {
            switch ($this->endpointPatternDecider($command, $request)) {
                case self::HOST_STYLE:
                    $request = $this->applyHostStyleEndpoint($command, $request);
                    break;
                case self::NO_PATTERN:
                    break;
                case self::PATH_STYLE:
                    $request = $this->applyPathStyleEndpointCustomizations($command, $request);
                    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
            )
            && filter_var($request->getUri()->getHost(), FILTER_VALIDATE_IP) === 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 applyPathStyleEndpointCustomizations(
        CommandInterface $command,
        RequestInterface $request
    ) {
        if ($command->getName() == 'WriteGetObjectResponse') {
            $dnsSuffix = $this->endpointProvider
                ->getPartition($this->region, 's3')
                ->getDnsSuffix();
            $fips = \Aws\is_fips_pseudo_region($this->region) ? "-fips" : "";
            $region = \Aws\strip_fips_pseudo_regions($this->region);
            $host =
                "{$command['RequestRoute']}.s3-object-lambda{$fips}.{$region}.{$dnsSuffix}";

            $uri = $request->getUri();
            $request = $request->withUri(
                $uri->withHost($host)
                    ->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()
    {
        $dnsSuffix = $this->endpointProvider
            ->getPartition($this->region, 's3')
            ->getDnsSuffix();
        return "s3.dualstack.{$this->region}.{$dnsSuffix}";
    }

    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)
    {
        $dnsSuffix = $this->endpointProvider
            ->getPartition($this->region, 's3')
            ->getDnsSuffix();
        return "{$command['Bucket']}.{$pattern}.{$dnsSuffix}";
    }

    private function getBucketlessPath($path, CommandInterface $command)
    {
        $pattern = '/^\\/' . preg_quote($command['Bucket'], '/') . '/';
        $path = preg_replace($pattern, '', $path) ?: '/';
        if (substr($path, 0 , 1) !== '/') {
            $path = '/' . $path;
        }
        return $path;
    }

    private function applyEndpoint(
        CommandInterface $command,
        RequestInterface $request
    ) {
        $dualStack = isset($command['@use_dual_stack_endpoint'])
            ? $command['@use_dual_stack_endpoint'] : $this->dualStackByDefault;
        if (ArnParser::isArn($command['Bucket'])) {
            $arn = ArnParser::parse($command['Bucket']);
            $outpost = $arn->getService() == 's3-outposts';
            if ($outpost && $dualStack) {
                throw new InvalidArgumentException("Outposts + dualstack is not supported");
            }
            if ($arn instanceof ObjectLambdaAccessPointArn) {
                return $request;
            }
        }
        if ($dualStack) {
            throw new InvalidArgumentException("Custom Endpoint + Dualstack not supported");
        }
        if ($command->getName() == 'WriteGetObjectResponse') {
            $host = "{$command['RequestRoute']}.{$this->endpoint}";
            $uri = $request->getUri();
            return $request = $request->withUri(
                $uri->withHost($host)
                    ->withPath($this->getBucketlessPath(
                        $uri->getPath(),
                        $command
                    ))
            );
        }
        $host = ($this->pathStyleByDefault) ?
            $this->endpoint :
            $this->getBucketStyleHost(
                $command,
                $this->endpoint
            );
        $uri = $request->getUri();
        $scheme = $uri->getScheme();
        if(empty($scheme)){
            $request = $request->withUri(
                $uri->withHost($host)
            );
        } else {
            $request = $request->withUri($uri);
        }

        return $request;
    }
}