ARM Template for QnAmaker to output subscription key

Question

I'm working on creating an ARM template for a QnAMaker resource type in Azure. After creating a QnAMaker resource and exporting the template it creates a number of resources:

1. "Microsoft.CognitiveServices/accounts" of kind "QnAMaker"
2. "Microsoft.Search/searchServices"
3. "Microsoft.Web/serverfarms"
4. "Microsoft.Web/sites" including appsettings including "PrimaryEndpointKey": "[concat(parameters('appName'), '-PrimaryEndpointKey')]"

The ARM template has a hardcoded value in the "/sites" resource rather than picking it up from another resource.

In the outputs, there is a link to qna runtime:

"qnaRuntimeEndpoint": {
            "type": "String",
            "value": "[concat('https://',reference(resourceId('Microsoft.Web/sites', parameters('appName'))).hostNames[0])]"
        }

What should the output value be for retrieving a subscription key for the QnAMaker resource?

Answer 1

This uses cognitive services related functions. Looking at some other examples I arrived at...

"outputs": {
  "qnaKey":{
    "type": "string",
    "value": "[listKeys(concat(resourceGroup().id,'/providers/','Microsoft.CognitiveServices/accounts/', parameters('name')),'2016-02-01-preview').key1]"
  }
}

Cognitive Services API docs for listKeys