<?php 
namespace Aws\Exception; 
 
class CouldNotCreateChecksumException extends \RuntimeException 
{ 
    public function __construct($algorithm, \Exception $previous = null) 
    { 
        $prefix = $algorithm === 'md5' ? "An" : "A"; 
        parent::__construct("{$prefix} {$algorithm} checksum could not be " 
            . "calculated for the provided upload body, because it was not " 
            . "seekable. To prevent this error you can either 1) include the " 
            . "ContentMD5 or ContentSHA256 parameters with your request, 2) " 
            . "use a seekable stream for the body, or 3) wrap the non-seekable " 
            . "stream in a GuzzleHttp\\Psr7\\CachingStream object. You " 
            . "should be careful though and remember that the CachingStream " 
            . "utilizes PHP temp streams. This means that the stream will be " 
            . "temporarily stored on the local disk.", 0, $previous); 
    } 
} 
 
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