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<?php
namespace Aws\S3;
use AWS\CRT\CRT;
use Aws\Exception\CommonRuntimeException;
use GuzzleHttp\Psr7;
use InvalidArgumentException;
trait CalculatesChecksumTrait
{
/**
* @param string $requestedAlgorithm the algorithm to encode with
* @param string $value the value to be encoded
* @return string
*/
public static function getEncodedValue($requestedAlgorithm, $value) {
$requestedAlgorithm = strtolower($requestedAlgorithm);
$useCrt = extension_loaded('awscrt');
if ($useCrt) {
switch ($requestedAlgorithm) {
case 'crc32c':
return CRT::crc32c($value);
case 'crc32':
return CRT::crc32($value);
case 'sha256':
case 'sha1':
return base64_encode(Psr7\Utils::hash($value, $requestedAlgorithm, true));
default:
break;
throw new InvalidArgumentException(
"Invalid checksum requested: {$requestedAlgorithm}."
. " Valid algorithms are CRC32C, CRC32, SHA256, and SHA1."
);
}
} else {
if ($requestedAlgorithm == 'crc32c') {
throw new CommonRuntimeException("crc32c is not supported for checksums "
. "without use of the common runtime for php. Please enable the CRT or choose "
. "a different algorithm."
);
}
if ($requestedAlgorithm == "crc32") {
$requestedAlgorithm = "crc32b";
}
return base64_encode(Psr7\Utils::hash($value, $requestedAlgorithm, true));
}
}
}
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