AWSTemplateFormatVersion: '2010-09-09'
Description: AWS CloudFormation sample template that contains a single Lambda function
  behind an API Gateway

Resources:
  GreetingLambda:
    Type: AWS::Lambda::Function
    Properties:
      Code:
        ZipFile: !Join
          - "\n"
          - - '''use strict'';'
            - ''
            - // Greeter Lambda
            - exports.handler = (event, context, callback) => {
            - '  console.log(''Event:'', JSON.stringify(event));'
            - '  const name = event.name || ''World'';'
            - '  const response = {greeting: `Hello, ${name}!`};'
            - '  callback(null, response);'
            - '};'
      Description: A greeting function
      FunctionName: GreetingLambda
      Handler: index.handler
      Role: !GetAtt 'LambdaExecutionRole.Arn'
      Runtime: nodejs12.x
  LambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - lambda.amazonaws.com
            Action:
              - sts:AssumeRole
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
  GreetingApi:
    Type: AWS::ApiGateway::RestApi
    Properties:
      Name: Greeting API
      Description: API used for Greeting requests
      FailOnWarnings: true
  LambdaPermission:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:invokeFunction
      FunctionName: !GetAtt 'GreetingLambda.Arn'
      Principal: apigateway.amazonaws.com
      SourceArn: !Join
        - ''
        - - 'arn:aws:execute-api:'
          - !Ref 'AWS::Region'
          - ':'
          - !Ref 'AWS::AccountId'
          - ':'
          - !Ref 'GreetingApi'
          - /*
  ApiGatewayCloudWatchLogsRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - apigateway.amazonaws.com
            Action:
              - sts:AssumeRole
      Policies:
        - PolicyName: ApiGatewayLogsPolicy
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - logs:CreateLogGroup
                  - logs:CreateLogStream
                  - logs:DescribeLogGroups
                  - logs:DescribeLogStreams
                  - logs:PutLogEvents
                  - logs:GetLogEvents
                  - logs:FilterLogEvents
                Resource: '*'
  ApiGatewayAccount:
    Type: AWS::ApiGateway::Account
    Properties:
      CloudWatchRoleArn: !GetAtt 'ApiGatewayCloudWatchLogsRole.Arn'
  GreetingApiStage:
    DependsOn:
      - ApiGatewayAccount
    Type: AWS::ApiGateway::Stage
    Properties:
      DeploymentId: !Ref 'ApiDeployment'
      MethodSettings:
        - DataTraceEnabled: true
          HttpMethod: '*'
          LoggingLevel: INFO
          ResourcePath: /*
      RestApiId: !Ref 'GreetingApi'
      StageName: LATEST
  ApiDeployment:
    Type: AWS::ApiGateway::Deployment
    DependsOn:
      - GreetingRequest
    Properties:
      RestApiId: !Ref 'GreetingApi'
      StageName: DummyStage
  GreetingResource:
    Type: AWS::ApiGateway::Resource
    Properties:
      RestApiId: !Ref 'GreetingApi'
      ParentId: !GetAtt 'GreetingApi.RootResourceId'
      PathPart: greeting
  GreetingRequest:
    DependsOn: LambdaPermission
    Type: AWS::ApiGateway::Method
    Properties:
      AuthorizationType: NONE
      HttpMethod: GET
      Integration:
        Type: AWS
        IntegrationHttpMethod: POST
        Uri: !Join
          - ''
          - - 'arn:aws:apigateway:'
            - !Ref 'AWS::Region'
            - :lambda:path/2015-03-31/functions/
            - !GetAtt 'GreetingLambda.Arn'
            - /invocations
        IntegrationResponses:
          - StatusCode: '200'
        RequestTemplates:
          application/json: !Join
            - ''
            - - '{'
              - '  "name": "$input.params(''name'')"'
              - '}'
      RequestParameters:
        method.request.querystring.name: false
      ResourceId: !Ref 'GreetingResource'
      RestApiId: !Ref 'GreetingApi'
      MethodResponses:
        - StatusCode: '200'
  GreetingApiCustomDomain:
    Type: AWSSamples::ApiGateway::CustomDomain::MODULE
    Properties:
      CertificateArn: !Ref CertificateArn
      CustomDomainName: !Ref CustomDomainName
      ApiType: EDGE
      ApiId: !Ref GreetingApi
      ApiStage: !Ref GreetingApiStage
      ApiBasePath: ''
      PrivateHostedZoneId: ''
      PublicHostedZoneId: !Ref PublicHostedZoneId

Parameters:
  PublicHostedZoneId:
    Description: The ID of the public Route 53 hosted zone that you want to create records in. Specify at least one Private or Public hosted zone id.
    Type: String
  CustomDomainName:
    Description: Custom domain name for the API
    Type: String
  CertificateArn:
    Description: Arn of ACM certificate matching the custom domain
    Type: String
  
Outputs:
  RootUrl:
    Description: Root URL of the API gateway
    Value: !Join
      - ''
      - - https://
        - !Ref 'GreetingApi'
        - .execute-api.
        - !Ref 'AWS::Region'
        - .amazonaws.com