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Dreamescaper/dotnet-lambda-cdk-asset-hash.cs

Created March 1, 2023 13:17
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dotnet lambda CDK Custom AssetHash
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dotnet-lambda-cdk-asset-hash.cs
public static Code GetLambdaCode(string zipPath)
{
return Code.FromAsset(zipPath, new AssetOptions
{
AssetHash = HashForZipContent(zipPath),
AssetHashType = Amazon.CDK.AssetHashType.CUSTOM
});
}
private static string HashForZipContent(string zipPath)
{
// See https://github.com/aws/aws-extensions-for-dotnet-cli/issues/195
using var sha256 = SHA256.Create();
IEnumerable<byte> fileHashes = Array.Empty<byte>();
using var archive = ZipFile.OpenRead(zipPath);
foreach (var entry in archive.Entries.OrderBy(e => e.FullName))
{
using var entryStream = entry.Open();
var entryHash = sha256.ComputeHash(entryStream);
fileHashes = fileHashes.Concat(entryHash);
}
var zipHash = sha256.ComputeHash(fileHashes.ToArray());
return Convert.ToBase64String(zipHash);
}
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