In Cloudformation YAML, use a Ref in a multiline string (? use Fn:Sub)

Question

Imagine you have a aws resource such as

  Resources:
    IdentityPool:
      Type: "AWS::Cognito::IdentityPool"
      Properties:
        IdentityPoolName: ${self:custom.appName}_${self:provider.stage}_identity
        CognitoIdentityProviders:
          - ClientId:
              Ref: UserPoolClient

The Ref for "AWS::Cognito::IdentityPool" returns the id of this resource. Now lets say I want to reference that id in a multiline string. I've tried

Outputs:  
  AmplifyConfig:
    Description: key/values to be passed to Amplify.configure(config);
    Value: |
      {
        'aws_cognito_identity_pool_id': ${Ref: IdentityPool}, ##<------ Error
        'aws_sign_in_enabled': 'enable',
        'aws_user_pools_mfa_type': 'OFF',
      }

I've also tried to use Fn:Sub but without luck.

   AmplifyConfig:
      Description: key/values to be passed to Amplify.configure(config);
      Value: 
        Fn::Sub 
          - |
            {
              'aws_cognito_identity_pool_id': '${Var1Name}',
              'aws_sign_in_enabled': 'enable',
            }
          - Var1Name:
              Ref: IdentityPool

Any way to do this?

Answer 1

Using a pipe symbol | in YAML turns all of the following indented lines into a multi-line string.

A pipe, combined with !Sub will let you use:

• your resources Ref return value easily like ${YourResource}
• their Fn::GetAtt return values with just a period ${YourResource.TheAttribute}
• any Pseudo Parameter just as is like ${AWS:region}

As easy as !Sub |, jumping to the next line and adding proper indentation. Example:

Resources:
  YourUserPool:
    Type: AWS::Cognito::UserPool
    Properties:
      UserPoolName: blabla

Outputs:
  AmplifyConfig:
    Description: key/values to be passed to Amplify.configure(config);
    Value: !Sub |
      {
        'aws_cognito_identity_pool_id': '${YourUserPool}',
        'aws_sign_in_enabled': 'enable',
        'aws_user_pools_mfa_type': 'OFF',
      }
  AdvancedUsage:
    Description: use Pseudo Parameters and/or resources attributes
    Value: !Sub |
      {
        'aws_region': '${AWS::Region}',
        'user_pool_arn': '${YourUserPool.Arn}',
      }