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Serverless OAuth2 server with OpenIddict 5 and AWS DynamoDB - Part 0

· 6 min read
Akhan Zhakiyanov
Akhan Zhakiyanov
Lead engineer

After succesfully running ASP.NET 8 Minimal API with Lambda Container image it's time to run something real.

And just in December 2023 Kévin Chalet announced new version of OpenIddict, the library to build your own OAuth2 / OpenID Connect server in .NET.

Officially OpenIddict supports two implementations for persistance layer:

This time we will explore how to implement fully serverless OAuth2 server using OpenIddict 5 with Lambda Container image and persistance layer backed by AWS DynamoDB

note

Due to the large scope this will be series of posts covering the following aspects:

  • OpenIddict custom stores implementation with DynamoDB
  • Fully serverless OAuth2 server sample and setup for local testing
  • CDK custom component lib for OpenIddict
  • Cost analysis and comparison with Cognito, Auth0, etc
tip

You can find source code available at https://github.com/ahanoff/OpenIddict.DynamoDb

First let's review OpenIddict concepts and components.

Running ASP.NET 8 Minimal API on AWS Lambda with Container Image

· 14 min read
Akhan Zhakiyanov
Akhan Zhakiyanov
Lead engineer
warning

Code samples were updated to run with x86_64 architecture

.NET 8 is finally here, since its release over a month ago.

Probably one of the much anticipated feature was Native AOT and its support for ASP.NET Core. Benefits coming along with it (such as minimized disk footprint, reduced startup time, and reduced memory demand) will lead to exploration how to run ASP.NET Core 8 apps in AWS Lambda.

Last year AWS gave us only two options to run .NET 7 Lambda functions: either container image or custom runtime. Now, in a twist for 2024, AWS is throwing its full support behind .NET 8 runtime, set to drop officially sometime in January. I think it's due to the fact that .NET 8 is an LTS release with a solid 3-year support plan.

And today I will show you the simplest way to run ASP.NET Core 8 in AWS Lambda without tearing everything apart!

info

This article targets experienced ASP.NET Core developers who considering to run their apps in serverless environment without major changes in existing programming model

TL;DR expected changes:

  • use Amazon.Lambda.AspNetCoreServer.Hosting package with .AddAWSLambdaHosting extension method
  • use AWS managed base image for .NET 8. Currently only public.ecr.aws/lambda/dotnet:8-preview is available
  • use CMD with assembly name instead of function handler string in Dockerfile

All codebase is available at: https://github.com/ahanoff/how-to/tree/main/aspnet8-minimal-api-lambda-container-image

First let's see what kind of objectives ASP.NET Core developers might have prior to investing their time and efforts into AWS serverless technology.