AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Serverless patterns - Amazon API Gateway REST API with VPC Link integration

Parameters:
  NlbInternalDns:
    Type: String
  NlbInternalArn:
    Type: String

Resources:
  
  # REST API
  AppApi:
    Type: AWS::ApiGateway::RestApi
    Properties:
      Name: apigw-rest-api-vpclink
      Description: VPC Link integraton REST API demo

  RootMethodGet:
    Type: AWS::ApiGateway::Method
    Properties:
      RestApiId: !Ref AppApi
      ResourceId: !GetAtt AppApi.RootResourceId
      HttpMethod: GET
      AuthorizationType: NONE
      Integration:
        Type: HTTP_PROXY
        ConnectionType: VPC_LINK
        IntegrationHttpMethod: GET
        ConnectionId: !Ref VPCLinkRestNlbInternal
        Uri: !Sub http://${NlbInternalDns}

  Deployment:
    Type: AWS::ApiGateway::Deployment
    DependsOn:
    - RootMethodGet
    Properties:
      RestApiId: !Ref AppApi
  
  Stage:  
    Type: AWS::ApiGateway::Stage
    Properties:
      StageName: Prod
      RestApiId: !Ref AppApi
      DeploymentId: !Ref Deployment

  VPCLinkRestNlbInternal:
    Type: AWS::ApiGateway::VpcLink
    Properties:
      Name: VPCLinkRestNlbInternal
      TargetArns:
        - !Ref NlbInternalArn

Outputs:

  # API Gateway endpoint to be used during tests
  AppApiEndpoint:
    Description: API Endpoint
    Value: !Sub "https://${AppApi}.execute-api.${AWS::Region}.amazonaws.com/Prod"