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