cloudformation-custom-resource/template.yml at master · serverlesspub/cloudformation-custom-resource · GitHub

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AWSTemplateFormatVersion: '2010-09-09'
Description: Generic workflow for custom CloudFormation Resources
Parameters:
  DLQSNSTopicARN:
    Type: String
    Description: >
      Optional ARN of an SNS topic for dead-letter queues for the workflow.
      Useful for troubleshooting configuration.
    Default: ''
  TaskLambdaARN:
    Type: String
    Description: The ARN of a task to execute (For example, a Lambda function)

Resources:

  CloudformationUploadResultLambdaRole:
    Type: "AWS::IAM::Role"
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: "sts:AssumeRole"
      Policies:
        - PolicyName: WriteCloudWatchLogs
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - 'logs:CreateLogGroup'
                  - 'logs:CreateLogStream'
                  - 'logs:PutLogEvents'
                Resource: 'arn:aws:logs:*:*:*'

  StartStateMachineLambdaExecutionRole:
    Type: "AWS::IAM::Role"
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: "sts:AssumeRole"
      Policies:
        - PolicyName: WriteCloudWatchLogs
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - 'logs:CreateLogGroup'
                  - 'logs:CreateLogStream'
                  - 'logs:PutLogEvents'
                Resource: 'arn:aws:logs:*:*:*'
        - PolicyName: WriteDLQTopic
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action: 'sns:Publish'
                Resource: !Ref DLQSNSTopicARN
        - PolicyName: StartStateMachine
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action:
                  - 'states:StartExecution'
                Resource: !Ref StateMachine

  StateMachineExecutionRole:
    Type: "AWS::IAM::Role"
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: "Allow"
            Principal:
              Service:
                - !Sub states.${AWS::Region}.amazonaws.com
            Action: "sts:AssumeRole"
      Policies:
        - PolicyName: AllowLambdaExecution
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action: 'lambda:InvokeFunction'
                Resource:
                  - !Ref TaskLambdaARN
                  - !GetAtt CloudformationUploadResultLambdaFunction.Arn


  CloudformationUploadResultLambdaFunction:
    Type: 'AWS::Lambda::Function'
    Properties:
      Runtime: nodejs8.10
      Code: src/
      Handler: index.uploadResults
      Role: !GetAtt CloudformationUploadResultLambdaRole.Arn
      Timeout: 100

  StateMachine:
    Type: "AWS::StepFunctions::StateMachine"
    Properties:
      RoleArn: !GetAtt StateMachineExecutionRole.Arn
      DefinitionString:
        !Sub |-
          {
            "Comment": "Execute a custom Cloudformation flow",
            "StartAt": "RunTask",
            "States": {
              "RunTask": {
                "Type": "Task",
                "Resource": "${TaskLambdaARN}",
                "Catch": [{
                  "ErrorEquals": [ "States.ALL" ],
                  "Next": "UploadResult",
                  "ResultPath": "$.Error"
                }],
                "Next": "UploadResult"
              },
              "UploadResult": {
                "Type": "Task",
                "Resource": "${CloudformationUploadResultLambdaFunction.Arn}",
                "End": true
              }
            }
          }

  StartStateMachineLambdaFunction:
    Type: 'AWS::Lambda::Function'
    Properties:
      Runtime: nodejs8.10
      Code: src/
      Handler: index.startStateMachine
      Role: !GetAtt StartStateMachineLambdaExecutionRole.Arn
      Timeout: 30
      Environment:
        Variables:
          STATE_MACHINE: !Ref StateMachine
      DeadLetterConfig:
        TargetArn: !Ref DLQSNSTopicARN

Outputs:
  ServiceToken:
    Value: !GetAtt StartStateMachineLambdaFunction.Arn