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<?php
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namespace Aws\S3\Parser;
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use Aws\CommandInterface;
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use Aws\ResultInterface;
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use Psr\Http\Message\ResponseInterface;
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/**
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 * A custom mutator for a GetBucketLocation request, which
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 * extract the bucket location value and injects it into the
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 * result as the `LocationConstraint` field.
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 *
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 * @internal
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 */
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final class GetBucketLocationResultMutator implements S3ResultMutator
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{
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    /**
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     * @inheritDoc
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     */
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    public function __invoke(
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        ResultInterface $result,
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        CommandInterface $command,
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        ResponseInterface $response
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    ): ResultInterface
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    {
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        if ($command->getName() !== 'GetBucketLocation') {
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            return $result;
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        }
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        static $location = 'us-east-1';
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        static $pattern = '/>(.+?)<\/LocationConstraint>/';
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        if (preg_match($pattern, $response->getBody(), $matches)) {
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            $location = $matches[1] === 'EU' ? 'eu-west-1' : $matches[1];
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        }
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        $result['LocationConstraint'] = $location;
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        $response->getBody()->rewind();
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        return $result;
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    }
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}