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AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  http-api-blog

  Sample SAM Template for http-api-blog

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 3

Resources:

  # Echo API for base64 intro -------------------------------------------------
  #
  # * Define Api explicitly because we need it to be a HTTP API
  # * Let SAM implicitly define an execution role
  # * Create and attach two functions to the API on different URIs

  EchoHttpApi:
    Type: AWS::Serverless::HttpApi
    Properties:
      StageName: prod

  # Simple echo API, whatever JSON comes in through the event object
  # is echoed back as the response message body
  EchoJsonLambdaFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: echo_api/
      Handler: echo_json.lambda_handler
      Runtime: python3.8
      Events:
        EchoJsonHttp:
          Type: HttpApi # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /echojson
            Method: any
            ApiId: !Ref EchoHttpApi

  # Echo message body and encoding. This endpoint will copy 
  # * incoming headers         into response headers
  # * incoming body            into response body 
  # * incoming isBase64Encoded into response isBase64Encoded
  EchoRawLambdaFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: echo_api/
      Handler: echo_raw.lambda_handler
      Runtime: python3.8
      Events:
        EchoRawHttp:
          Type: HttpApi # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /echoraw
            Method: any
            ApiId: !Ref EchoHttpApi

  # Noise API for core blog post ----------------------------------------------
  #
  # * Define Api explicitly because we need it to be a HTTP API
  # * Define Lambda execution role explicitly to make it easy to expand later
  # * Create and attach a single function to the API 

  NoiseHttpApi:
    Type: AWS::Serverless::HttpApi
    Properties:
      StageName: prod
      CorsConfiguration: 
        AllowOrigins:
          - "*"
        AllowHeaders:
          - "Access-Control-Allow-Origin"
          - "Content-Type"
          - "X-Requested-With"
        AllowMethods:
          - GET
          - POST
          - OPTIONS

  NoiseLambdaExecutionRole:
    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

  NoiseLambdaFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: img_api/
      Handler: app.lambda_handler
      Runtime: python3.8
      Role: !GetAtt NoiseLambdaExecutionRole.Arn
      Events:
        NoiseGenHttp:
          Type: HttpApi # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#httpapi
          Properties:
            Path: /noise
            Method: any
            ApiId: !Ref NoiseHttpApi

Outputs:

  # Outputs for echo API
  EchoJsonHttpApi:
    Description: "API Gateway HTTP endpoint URL for Prod stage for echo function"
    Value: !Sub "https://${EchoHttpApi}.execute-api.${AWS::Region}.amazonaws.com/prod/echojson"
  EchoRawHttpApi:
    Description: "API Gateway HTTP endpoint URL for Prod stage for echo function"
    Value: !Sub "https://${EchoHttpApi}.execute-api.${AWS::Region}.amazonaws.com/prod/echoraw"

  # Outputs for noise API
  NoiseLambdaFunction:
    Description: "Lambda Function ARN for generating noise images"
    Value: !GetAtt NoiseLambdaFunction.Arn
  NoiseHttpApi:
    Description: "API Gateway HTTP endpoint URL for Prod stage for noise function"
    Value: !Sub "https://${NoiseHttpApi}.execute-api.${AWS::Region}.amazonaws.com/prod/noise"