apigateway_validation_with_proxy_integration.yml

---
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: API Gateway Request Model Validation using Lambda Proxy Integration
Resources:
  ApiGatewayApi:
    Type: AWS::Serverless::Api
    Properties:
      DefinitionBody: 
        swagger: 2.0
        basePath: /prod
        info:
          title: ModelValidatorExample
        schemes:
        - https
        paths:
          /{proxy+}:
            post:
              schema:
                $ref: "#/definitions/Empty"
              consumes:
              - application/json
              produces:
              - application/json
              parameters:
              - name: proxy
                in: path
                required: true
                type: string
              - in: body
                name: RequestBodyModel
                required: true
                schema: 
                  "$ref": "#/definitions/RequestBodyModel"
              responses: {}
              x-amazon-apigateway-integration:
                uri: !Sub arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${LambdaFunction.Arn}/invocations
                httpMethod: POST
                type: aws_proxy
        x-amazon-apigateway-request-validator : "all"
        x-amazon-apigateway-request-validators:
            all: 
              validateRequestBody : true
              validateRequestParameters : true
        definitions:
          Empty:
            type: object
            title: Empty Schema
          RequestBodyModel: 
              type: object
              properties: 
                id:   
                  type: integer
              required:
              - id
      StageName: Prod
  #We aren't using AWS::Serverless::Function so we can inline code and make this cfn template self-contained
  LambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      Code:
        ZipFile: >
          exports.handler = function(event, context, callback) {
            callback(null, {
                statusCode: '200',
                body: JSON.stringify(event)
            }); }
      Handler: index.handler
      Runtime: nodejs6.10
      Role: 
        Fn::GetAtt: 
          - "LambdaExecutionRole"
          - "Arn"
  LambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument: 
        Version: "2012-10-17"
        Statement: 
          - 
            Effect: "Allow"
            Principal: 
              Service: 
                - "lambda.amazonaws.com"
            Action: 
              - "sts:AssumeRole"
  LambdaInvokePermission:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: !Ref LambdaFunction
      Action: 'lambda:InvokeFunction'
      Principal: apigateway.amazonaws.com
      SourceArn: !Sub arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:*