Conditionally add site property using ARM templates - azure-resource-manager

Question

I have a situation where I sometimes want my site to have a hostNameSslStates property. I have been trying to figure out how to do this without having seperate deployments for sites with a hostNameSslState and sites without.
This is how I would add a site today, I then add slots, config, certifcates, roles etc so the total ARM file is much larger.
{
"name": "[parameters('appServiceName')]",
"type": "Microsoft.Web/sites",
"apiVersion": "2018-11-01",
"location": "[parameters('location')]",
"tags": {
"displayName": "AppService"
},
"identity": {
"type": "SystemAssigned"
},
"properties": {
"serverFarmId": "[resourceId('Microsoft.Web/serverfarms', parameters('appServicePlanName'))]",
"siteConfig": "[variables('siteConfig')]",
"hostNameSslStates": [
{
"name": "[parameters('websiteCustomDomainName')]",
"sslState": "SniEnabled",
"thumbprint": "[reference(resourceId('Microsoft.Web/certificates', variables('certificateName'))).Thumbprint]",
"toUpdate": true
}
]
}
}
The problem is that some app services does not have a custom domain and does not need a hostNameSslStates property and I am not able to find a solution to how to implement this in the template. I can have a variable that is "hostNameSslState" but I am not able to condition the property. If I could specify hostNameSslStates as a seperate resource then that would solve my issue but I have not been able to figure it out.

Answer 1

you can do this:
"hostNameSslStates": "[if(something, variables('sslStuff'), json('[]'))]"
and then in your variables define sslStuff:
"sslStuff": [
{
"name": "[parameters('websiteCustomDomainName')]",
"sslState": "SniEnabled",
"thumbprint": "[reference(resourceId('Microsoft.Web/certificates', variables('certificateName'))).Thumbprint]",
"toUpdate": true
}
}