LambdaStartupAttribute support for Configure method.

[manuquintero]

Hi,
In a Amazon.Lambda.Annotations application, I am using LambdaStartup but it looks like it only supports ConfigureServices, how can I use Configure so I can configure other items like UseAuthentication() and UseAuthorization()

Thanks

[ashishdhingra]

@manuquintero Good morning. Per my analysis and available documentation,

• Lambda annotations relies on source generators to translate your annotated Lambda functions to the regular Lambda programming model (refer https://aws.amazon.com/blogs/developer/net-lambda-annotations-framework/).
• Decorating a class with Amazon.Lambda.Annotations.LambdaStartup attribute causes source generation process to invoke <>.ConfigureServices() in the generated code for LambdaFunctions. Below is an example:

...
namespace SomeNamespace
{
    public class Functions_Add_Generated
    {
        private readonly ServiceProvider serviceProvider;

        public Functions_Add_Generated()
        {
            SetExecutionEnvironment();
            var services = new ServiceCollection();

            ...
            var startup = new LambdaAnnotations_Issue1368.Startup();
            startup.ConfigureServices(services);
            serviceProvider = services.BuildServiceProvider();
        }

        public Amazon.Lambda.APIGatewayEvents.APIGatewayHttpApiV2ProxyResponse Add(Amazon.Lambda.APIGatewayEvents.APIGatewayHttpApiV2ProxyRequest __request__, Amazon.Lambda.Core.ILambdaContext __context__)
        {
...
    }
}

• Source generation process also generates serverless.template to create API Gateway resources. So it's mapping HTTP API endpoints to generated Lambda functions.

Based on above understanding, I'm unsure if we could configure HTTP request pipeline to invoke UseAuthentication(), UseAuthorization(), etc. since it doesn't leverage the ASP.NET request pipeline.

Reference example (using both programming models): https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/dotnetv3/cross-service/PhotoAssetManager

CCing @normj for validating the findings and any further inputs.

Thanks,
Ashish