AWS Cloudformation字符串列表错误

Question

ERROR: Property validation failure: [Value of property {/StreamingDistributionConfig/TrustedSigners/AwsAccountNumbers} does not match type {Array}].

I am trying to get multiple account Id's in a parameter called awsAccountNumbers, for which the cloudformation document says this parameter must be of type StringList. However, there's no such type. We have String and CommaDelimitedList in the AWS parameters reference for which I get the mentioned error. I tried splitting it too, but of no help. Please find my code below:

**Parameters Section:** 
  "awsAccountNumbers": {
            "Type": "String",

  }

**Resources Section:** 

   "TrustedSigners": {
                        "AwsAccountNumbers": {
                            "Fn::If": [
                                "withRestrictViewerAccessasYes",
                                {
                                    "Fn::If": [
                                        "withTrustedSignersasSelf",
                                        "882410330966",
                                        [
                                            {
                                                "Fn::Select": [
                                                    "0",
                                                    {
                                                        "Fn::Split": [
                                                            ",",

                                                            { "Ref": "awsAccountNumbers" }

                                                        ]
                                                    }
                                                ]
                                            }
                                        ]
                                    ]
                                },
                                {
                                    "Ref": "AWS::NoValue"
                                }
                            ]
                        },
                        "Enabled": {
                            "Ref": "trustedSignersEnabled"
                        }
                    }

Answer 1

I guess the error points to the actual properties( AwsAccountNumbers ) not the parameter(awsAccountNumbers).

AwsAccountNumbers expects a list. It should be something like below (untested)

"Parameters" : {
  "awsAccountNumbers": {
    "Type": "CommaDelimitedList",
     "Default": "882410330966, 882410330966, 882410330966"
  }

{
    "TrustedSigners": {
        "AwsAccountNumbers": [{
            "Fn::If": [
                "withRestrictViewerAccessasYes",
                {
                    "Fn::If": [
                        "withTrustedSignersasSelf",
                        "882410330966", [{
                            "Fn::Select": [
                                "0",
                                {
                                    "Ref": "awsAccountNumbers"
                                }
                            ]
                        }]
                    ]
                },
                {
                    "Ref": "AWS::NoValue"
                }
            ]
        }],
        "Enabled": {
            "Ref": "trustedSignersEnabled"
        }
    }
}