AWS::Serverless::HttpApi add default sigv4

[DmytroMilashenko]

Describe your idea/feature/enhancement

Presently HttpApi supports IAM auth. https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-access-control-iam.html

Proposal

When IAM is set via AWS Console and API is exported it generates:

components:
  securitySchemes:
    sigv4:
      type: "apiKey"
      name: "Authorization"
      in: "header"
      x-amazon-apigateway-authtype: "awsSigv4"

So it is proposed to generate sigv4 by default, so that is can be referenced in lambda

Lambda:
    Type: AWS::Serverless::Function
    Properties:
      Events:
        MyEvent:
          Type: HttpApi
          Properties:
            Auth:
              Authorizer: sigv4

Things to consider:

Please remember to add this information to documentation.

[DmytroMilashenko]

Seems to be https://github.com/aws/serverless-application-model issue instead.

[hawflau]

@DmytroMilashenko Thanks for submitting the issue. And you're right, I think it should be transferred to SAM instead.

[hawflau]

Closing this issue as it is duplicated - #1731
A PR is work-in-progress - #1924