AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: An Amazon REST API gateway integrated with a AWS Lambda function that calls AWS Translate service to translate given text, then call AWS Polly service to convert the text into speech and save audio file to s3. (uksb-1tthgi812) (tag:apigw-lambda-translate-polly-s3)

Parameters:
  s3BucketName:
    Type: String
    Description: s3 bucket to save audio files generated by polly

Resources:
  # S3 bucket to store audio file created by polly service
  AudioFileBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Ref s3BucketName
  # API Gateway REST API
  ApiGatewayApi:
    Type: AWS::Serverless::Api
    Properties:
      Name: apigw-translate-polly-s3
      StageName: prod
      EndpointConfiguration:
        Type: REGIONAL
  # Lambda Function to call AWS Translate and Polly services
  ApiFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: lambda-translate-polly-s3
      Environment:
        Variables:
          S3_BUCKET_NAME: !Ref s3BucketName
      Runtime: python3.9
      Handler: index.lambda_handler
      CodeUri: src/
      MemorySize: 128
      Policies:
        - TranslateReadOnly
        - AmazonPollyReadOnlyAccess
        - Version: '2012-10-17'
          Statement:
            - Effect: Allow
              Action: 
                - "s3:GetObject"
                - "s3:PutObject"
              Resource: "*"
      Events:
        ApiEvent:
          Type: Api
          Properties:
            Path: /
            Method: post
            RestApiId:
              Ref: ApiGatewayApi

Outputs:
  RestApiEndpoint:
    Description: "The endpoint for the REST API Gateway"
    Value: !Sub "https://${ApiGatewayApi}.execute-api.${AWS::Region}.amazonaws.com/prod/"