AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Serverless patterns - This SAM template creates a Regional REST API with a mapping template in the integration request to pass to the lambda function.

Resources:
  #Lambda function returning request id
  LambdaFunction:
    Type: AWS::Serverless::Function 
    Properties:
      Handler: index.handler
      InlineCode: |
        console.log('Loading function');
        exports.handler = async (event, context) => {
            var apiRequestId = event.context['request-id'];
            var lambdaRequestId = context.awsRequestId;
            console.log("API Gateway Request ID: " + apiRequestId + " Lambda Request ID: " + context.awsRequestId);
            var logprefix = "APIG: " + apiRequestId + " -  ";
            console.log(logprefix);
            return "Hello from the mapping template API"; 
        };
      Runtime: nodejs18.x
      Events:
        HelloWorld:
          Type: Api 
          Properties: 
            Path: /
            Method: any
            RestApiId:
              Ref: ApiRegional

  #API with Lambda no proxy integration
  ApiRegional:
    Type: AWS::Serverless::Api
    OpenApiVersion: '2.0'
    Properties:
      StageName: prod
      EndpointConfiguration: REGIONAL
      DefinitionBody:
        swagger: 2.0
        info:
          title: API Gateway Mapping Templates
        basePath: /prod
        schemes:
          - https
        paths:
          /:
            x-amazon-apigateway-any-method:
              produces:
                - application/json
              consumes:
                - application/json
              x-amazon-apigateway-integration:
                httpMethod: POST
                type: aws  
                uri:  
                  Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${LambdaFunction.Arn}/invocations
                passthroughBehavior: when_no_templates
                requestTemplates:
                  application/json: |
                    {
                      "context" : { 
                        "request-id" : "$context.requestId"
                      }
                    }
                responses:
                  default:
                    statusCode: 200
              responses: 
                '200':
                  description: 'Default response for ANY method'