AWSTemplateFormatVersion: '2010-09-09'
Description: Lambda  Unique Id generator
Resources:
  LambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - lambda.amazonaws.com
            Action:
              - sts:AssumeRole
      Path: '/'
      Policies:
        - PolicyName: lambda_policy
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - logs:CreateLogGroup
                  - logs:CreateLogStream
                  - logs:PutLogEvents
                Resource: arn:aws:logs:*:*:*
              - Effect: Allow
                Action:
                  - cloudformation:DescribeStacks
                Resource: '*'
  GenID:
    Type: AWS::Lambda::Function
    Properties:
      Code:
        ZipFile:
          Fn::Join:
            - "\n"
            - - import random
              - import json
              - import cfnresponse
              - from cfnresponse import send, SUCCESS
              - 'def handler(event, context):'
              - "   if event['RequestType'] == 'Delete':"
              - "       send(event, context, 'SUCCESS', {})"
              - '       return'
              - "   if event['RequestType'] == 'Create':"
              - '       token= "%0x%0x" % (random.SystemRandom().getrandbits(3*8),
                random.SystemRandom().getrandbits(8*8))'
              - '       responseData = {}'
              - "       responseData['Data'] = token"
              - "       send(event, context, 'SUCCESS', responseData)"
              - '       return token'
      Handler: index.handler
      Runtime: python3.9
      Timeout: 5
      Role:
        Fn::GetAtt:
          - LambdaExecutionRole
          - Arn
  GetID:
    Type: Custom::GenerateID
    Version: '1.0'
    Properties:
      ServiceToken:
        Fn::GetAtt:
          - GenID
          - Arn
      ResponseURL:
        Fn::Join:
          - ''
          - - http://ResponseURL
            - Ref: AWS::StackId
            - RequestId
      StackId:
        Ref: AWS::StackId
      ResourceProperties:
        RequestType: Create
        RequestId:
          Fn::Join:
            - ''
            - - Ref: AWS::StackId
              - RequestId
        LogicalResourceId: GenIDLogicalResourceId
Outputs:
  UniqueID:
    Value:
      Fn::GetAtt:
        - GetID
        - Data
    Export:
      Name: !Sub '${AWS::StackName}-UniqueID'