AWSTemplateFormatVersion: '2010-09-09'
Description: This utility app provides a custom resource that allows an SNS Topic Subscription's filter policy to be specified as a JSON string instead of a JSON object so it can be passed into apps as a template parameter.
Outputs:
  SetFilterPolicyFunctionArn:
    Description: SetFilterPolicy Lambda Function ARN
    Value:
      Fn::GetAtt:
      - SetFilterPolicy
      - Arn
  SetFilterPolicyFunctionName:
    Description: SetFilterPolicy Lambda Function Name
    Value:
      Ref: SetFilterPolicy
Parameters:
  LogLevel:
    Default: INFO
    Description: Log level for Lambda function logging, e.g., ERROR, INFO, DEBUG, etc
    Type: String
  SubscriptionArn:
    Description: ARN of the SNS Topic Subscription to apply the filter policy to.
    Type: String
  SubscriptionFilterPolicy:
    Description: SNS Topic Subscription FilterPolicy as a JSON string. See https://docs.aws.amazon.com/sns/latest/dg/message-filtering.html for details.
    MinLength: 2
    Type: String
  TopicArn:
    Description: ARN of the SNS Topic being subscribed to.
    Type: String
Resources:
  FilterPolicy:
    Properties:
      FilterPolicy:
        Ref: SubscriptionFilterPolicy
      ServiceToken:
        Fn::GetAtt:
        - SetFilterPolicy
        - Arn
      SubscriptionArn:
        Ref: SubscriptionArn
    Type: AWS::CloudFormation::CustomResource
  SetFilterPolicy:
    Properties:
      CodeUri:
        Bucket: <%REPO_BUCKET%>
        Key: 6ce61d1f-05fa-483d-977a-b065c6408e01
      Environment:
        Variables:
          LOG_LEVEL:
            Ref: LogLevel
      Handler: set_filter_policy.handler
      Policies:
      - Statement:
          Action:
          - sns:SetSubscriptionAttributes
          Effect: Allow
          Resource:
          - Fn::Sub: ${TopicArn}
      Runtime: python3.7
      Timeout: 5
      Tracing: Active
    Type: AWS::Serverless::Function
Transform: AWS::Serverless-2016-10-31