AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  Lambda function to store an uploaded file in S3 and start sync workflow to process it.

Globals:
  Function:
    Runtime: nodejs12.x
    Timeout: 10  
    Environment:
        Variables:
          UPLOADS_BUCKET: !Ref UploadsBucket

Resources:
##########################################################################
#  Lambda functions                                                      #
##########################################################################
  SavePayloadAndStartStateMachineFunction:
    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: src/functions/savePayloadAndStartStateMachine
      Handler: app.handler
      Policies:
        - S3CrudPolicy:
            BucketName:
              !Ref UploadsBucket
        - StepFunctionsExecutionPolicy: # Manually change to StartSyncExecution after deployment
            StateMachineName:
              !GetAtt ProcessFileStateMachine.Name
      Environment:
          Variables:
            PROCESS_FILE_STATE_MACHINE_ARN: !Ref ProcessFileStateMachine              
              
  ProcessFileFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/functions/processFile
      Handler: app.handler
      Policies:
        - S3CrudPolicy:
            BucketName:
              !Ref UploadsBucket
              
  AddFooterFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/functions/addFooter
      Handler: app.handler
      Policies:
        - S3ReadPolicy:
            BucketName:
              !Ref UploadsBucket
##########################################################################
#  S3 Bucket                                                             #
##########################################################################            
  UploadsBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: "lambda-s3-sfn-uploads"

##########################################################################
#  State Machine                                                        #
########################################################################## 
  ProcessFileStateMachine:
    Type: AWS::Serverless::StateMachine # More info about State Machine Resource: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-resource-statemachine.html
    Properties:
      DefinitionUri: src/statemachine/processFileStateMachine.asl.json
      DefinitionSubstitutions:
        ProcessFileFunctionArn: !GetAtt ProcessFileFunction.Arn
        AddFooterFunctionArn: !GetAtt AddFooterFunction.Arn
      Policies: 
        - LambdaInvokePolicy:
            FunctionName: !Ref ProcessFileFunction
        - LambdaInvokePolicy:
            FunctionName: !Ref AddFooterFunction            
      Type: EXPRESS

Outputs:
  SavePayloadAndStartStateMachineFunctionCli1:
    Description: Change the second function role action to "states:StartSyncExecution" then use this AWS CLI 1 command to test the deployed lambda function SavePayloadAndStartStateMachineFunction
    Value: !Sub "aws lambda invoke --function-name ${SavePayloadAndStartStateMachineFunction} --payload '{ \"payload\": \"hello world\"}' /dev/stdout"
  SavePayloadAndStartStateMachineFunctionCli2:
    Description: Change the second function role action to "states:StartSyncExecution" then use this AWS CLI 2 command to test the deployed lambda function SavePayloadAndStartStateMachineFunction
    Value: !Sub "aws lambda invoke --function-name ${SavePayloadAndStartStateMachineFunction}  --payload '{ \"payload\": \"hello world\"}' --cli-binary-format raw-in-base64-out response.json"