Custom rule: Check that an object value is in a list

[kftsehk]

Is this feature request related to a new rule or cfn-lint capabilities?

New capability

Describe the feature you'd like to request

Customizable check for "match item in a list (regardless of index of occurance)"

Describe the solution you'd like

Have tried override spec, so far can only do

{
  "ResourceTypes": {
    "AWS::Lambda::Function": {
      "Properties": {
        "Tags": {
          "Required": true
        }
      }
    }
  }
}

The above mandate adding tags, but not able to confirm the tag with specific name is added, e.g. for cost-center attribution.

Considering custom rule

# this rule is PASS if Tags is a list, and one of its element has subset of attribute matching provided json value.
# this rule is FAIL if Tags is not a list, or none of its element contains all attributes provided by the json value.
AWS::Lambda::Function Tags LIST_CONTAINS {"Key":"service-name"} ERROR "Please set cost-center tag"

Additional context

Use case is to make sure some tags / properties are added as required.

  SomeLambda:
    Properties:
      Tags:
        - Key: 'serivce-name'
          Value: !Ref 'StackName'
        - Key: 'stage-name'
          Value: !Ref 'StackSet'
      VpcConfig:
        SubnetIds:
          - !Sub '{{resolve:ssm:/${StackSet}/infra/vpc/az/0/subnet/private/id}}'
          - !Sub '{{resolve:ssm:/${StackSet}/infra/vpc/az/1/subnet/private/id}}'
    Type: AWS::Lambda::Function

Is this something that you'd be interested in working on?

• [X] 👋 I may be able to implement this feature request

Would this feature include a breaking change?

• [ ] ⚠️ This feature might incur a breaking change