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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 Psr\Http\Message\RequestInterface;
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/**
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 * Logs a warning when the `expires` header
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 * fails to be parsed.
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 *
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 * @internal
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 */
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class ExpiresParsingMiddleware
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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 $result) {
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                if (empty($result['Expires']) && !empty($result['ExpiresString'])) {
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                    trigger_error(
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                        "Failed to parse the `expires` header as a timestamp due to "
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                        . " an invalid timestamp format.\nPlease refer to `ExpiresString` "
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                        . "for the unparsed string format of this header.\n"
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                        , E_USER_WARNING
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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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}