Azure Resource Manager template using a User-Defined Function to create the Storage Connection String

StorageConnectionStringUDF.json

{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "functions": [
    {
      "namespace": "storage",
      "members": {
        "connectionString": {
          "parameters": [
            {
              "name": "accountName",
              "type": "string"
            },
            {
              "name": "accountKey",
              "type": "string"
            }
          ],
          "output": {
            "type": "string",
            "value": "[concat('DefaultEndpointsProtocol=https;AccountName=', parameters('accountName'), ';AccountKey=', parameters('accountKey'), ';EndpointSuffix=core.windows.net')]"
          }
        }
      }
    }
  ],
  "resources": [
    {
      "type": "Microsoft.KeyVault/vaults",
      "name": "LoremVault",
      "apiVersion": "2015-06-01",
      "location": "[resourceGroup().location]",
      "properties": {
        "sku": {
          "family": "A",
          "name": "Standard"
        },
        "tenantId": "[subscription().tenantId]",
        "accessPolicies": [
          {
            "tenantId": "[subscription().tenantId]",
            "objectId": "CHANGETO-YOUR-USER-GUID-000000000000",
            "permissions": {
              "keys": [
                "All"
              ],
              "secrets": [
                "All"
              ]
            }
          }
        ]
      }
    },
    {
      "type": "Microsoft.Storage/storageAccounts",
      "kind": "Storage",
      "name": "loremipsumstore",
      "apiVersion": "2016-01-01",
      "sku": {
        "name": "Standard_LRS"
      },
      "location": "[resourceGroup().location]"
    },
    {
      "type": "Microsoft.KeyVault/vaults/secrets",
      "name": "LoremVault/SomeSecret",
      "apiVersion": "2015-06-01",
      "properties": {
        "contentType": "text/plain",
        "value": "ThisIpsemIsSecret"
      },
      "dependsOn": [
        "[resourceId('Microsoft.KeyVault/vaults', 'LoremVault')]"
      ]
    },
    {
      "type": "Microsoft.KeyVault/vaults/secrets",
      "name": "LoremVault/SomeCertificate",
      "apiVersion": "2015-06-01",
      "properties": {
        "contentType": "application/x-pkcs12",
        "value": "MIIV0QIBAzCC...LoremIpsum...RIJcq3QACAggA"
      },
      "dependsOn": [
        "[resourceId('Microsoft.KeyVault/vaults', 'LoremVault')]"
      ]
    },
    {
      "type": "Microsoft.KeyVault/vaults/secrets",
      "name": "LoremVault/ConnectionString",
      "apiVersion": "2015-06-01",
      "properties": {
        "contentType": "text/plain",
        "value": "[storage.connectionString('loremipsumstore', listKeys(resourceId('Microsoft.Storage/storageAccounts', 'loremipsumstore'), '2019-06-01').keys[0].value)]"
      },
      "dependsOn": [
        "[resourceId('Microsoft.KeyVault/vaults', 'LoremVault')]",
        "[resourceId('Microsoft.Storage/storageAccounts', 'loremipsumstore')]"
      ]
    }
  ]
}