# Hello world API using AWS CloudFormation

AWSTemplateFormatVersion: 2010-09-09
Description: |
  Not using SAM 
Resources:
  # First you need to grant API Gateway permession to use Lambda
  HelloWorldFunctionHelloWorldPermissionProd:
    Type: 'AWS::Lambda::Permission'
    Properties:
      Action: 'lambda:InvokeFunction'
      FunctionName: !Ref HelloWorldFunction
      Principal: apigateway.amazonaws.com
      SourceArn: !Sub 
        - >-
          arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:${__ApiId__}/${__Stage__}/GET/hello
        - __ApiId__: !Ref ServerlessRestApi
          __Stage__: '*'
  # IAM Role for Lambda
  HelloWorldFunctionRole:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Action:
              - 'sts:AssumeRole'
            Effect: Allow
            Principal:
              Service:
                - lambda.amazonaws.com
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole'
      Tags:
        - Key: 'lambda:createdBy'
          Value: SAM
  # API Gateway stage 
  ServerlessRestApiProdStage:
    Type: 'AWS::ApiGateway::Stage'
    Properties:
      DeploymentId: !Ref ServerlessRestApiDeployment47fc2d5f9d
      RestApiId: !Ref ServerlessRestApi
      StageName: Prod
  # Deploy the API Gateway
  ServerlessRestApiDeployment47fc2d5f9d:
    Type: 'AWS::ApiGateway::Deployment'
    Properties:
      Description: 'RestApi deployment id: 47fc2d5f9d21ad56f83937abe2779d0e26d7095e'
      RestApiId: !Ref ServerlessRestApi
      StageName: Stage
  # The API Gateway
  ServerlessRestApi:
    Type: 'AWS::ApiGateway::RestApi'
    Properties:
      Body:
        info:
          version: '1.0'
          title: !Ref 'AWS::StackName'
        paths:
          /hello:
            get:
              x-amazon-apigateway-integration:
                httpMethod: POST
                type: aws_proxy
                uri: !Sub >-
                  arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${HelloWorldFunction.Arn}/invocations
              responses: {}
        swagger: '2.0'
  # ok now the Function 
  HelloWorldFunction:
    Type: 'AWS::Lambda::Function'
    Metadata:
      SamResourceId: HelloWorldFunction
    Properties:
      Code:
        S3Bucket: aws-sam-cli-managed-default-samclisourcebucket-1bqeiayem2z8g
        S3Key: 2f79732113d63e8bed26938ff91dc59f
      Handler: app.lambda_handler
      Role: !GetAtt 
        - HelloWorldFunctionRole
        - Arn
      Runtime: python3.10
      Timeout: 3
      Tags:
        - Key: 'lambda:createdBy'
          Value: SAM
      Architectures:
        - x86_64
Outputs:
  HelloWorldApi:
    Description: API Gateway endpoint URL for Prod stage for Hello World function
    Value: !Sub >-
      https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/
  HelloWorldFunction:
    Description: Hello World Lambda Function ARN
    Value: !GetAtt 
      - HelloWorldFunction
      - Arn
  HelloWorldFunctionIamRole:
    Description: Implicit IAM Role created for Hello World function
    Value: !GetAtt 
      - HelloWorldFunctionRole
      - Arn