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<?php
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namespace Aws\S3;
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use Aws\CommandInterface;
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use Aws\ResultInterface;
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use Aws\S3\Exception\PermanentRedirectException;
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use Psr\Http\Message\RequestInterface;
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/**
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 * Throws a PermanentRedirectException exception when a 301 redirect is
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 * encountered.
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 *
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 * @internal
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 */
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class PermanentRedirectMiddleware
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{
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    /** @var callable  */
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    private $nextHandler;
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    /**
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     * Create a middleware wrapper function.
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     *
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     * @return callable
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     */
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    public static function wrap()
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    {
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        return function (callable $handler) {
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            return new self($handler);
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        };
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    }
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    /**
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     * @param callable $nextHandler Next handler to invoke.
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     */
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    public function __construct(callable $nextHandler)
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    {
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        $this->nextHandler = $nextHandler;
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    }
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    public function __invoke(CommandInterface $command, RequestInterface $request = null)
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    {
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        $next = $this->nextHandler;
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        return $next($command, $request)->then(
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            function (ResultInterface $result) use ($command) {
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                $status = isset($result['@metadata']['statusCode'])
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                    ? $result['@metadata']['statusCode']
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                    : null;
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                if ($status == 301) {
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                    throw new PermanentRedirectException(
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                        'Encountered a permanent redirect while requesting '
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                        . $result->search('"@metadata".effectiveUri') . '. '
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                        . 'Are you sure you are using the correct region for '
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                        . 'this bucket?',
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                        $command,
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                        ['result' => $result]
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                    );
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                }
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                return $result;
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            }
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        );
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    }
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}