Azure策略检查是否存在空值

我需要一个用于标记的Azure策略。我希望在创建资源组时，用户需要定义一个标记。策略还应检查tagvaule是否为空

我尝试了以下方法：

{
  "properties": {
    "displayName": "Require a tag Billto and a value that is not empty",
    "policyType": "Custom",
    "mode": "All",
    "description": "Enforces a required tag and its value on resource groups.",
    "metadata": {
      "category": "Tags",
    },
    "parameters": {
      "tagName": {
        "type": "String",
        "metadata": {
          "displayName": "Tag Name",
          "description": "Name of the tag, such as 'Billto'"
        }
      },
      "tagValue": {
        "type": "String",
        "metadata": {
          "displayName": "Tag Value",
          "description": "Value of the tag, such as 'Costcenter'"
        }
      }
    },
    "policyRule": {
      "if": {
        "allOf": [
          {
            "field": "type",
            "equals": "Microsoft.Resources/subscriptions/resourceGroups"
          },
          {
            "field": "[concat('tags[', parameters('tagName'), ']')]",
            "exists": "false"
          },
          {
            "value": "[concat('tags[', parameters('tagValue'), ']')]",
            "equals": ""
          }
        ]
      },
      "then": {
        "effect": "deny"
      }
    }
  }

有人能帮我找到正确的密码吗？

---

感谢Thomas

此策略定义将拒绝给定标记具有空值或完全缺少标记的资源组：

{
  "properties": {
    "mode": "All",
    "parameters": {
      "tagName": {
        "type": "String",
        "metadata": {
          "displayName": "Tag Name",
          "description": "Name of the tag, such as 'Billto'"
        }
      }
    },
    "policyRule": {
      "if": {
        "allOf": [
          {
            "field": "type",
            "equals": "Microsoft.Resources/subscriptions/resourceGroups"
          },
          {
            "anyOf": [
              {
                "field": "[concat('tags[', parameters('tagName'), ']')]",
                "exists": false
              },
              {
                "field": "[concat('tags[', parameters('tagName'), ']')]",
                "equals": ""
              }
            ]
          }
        ]
      },
      "then": {
        "effect": "deny"
      }
    }
  }
}

细分：

参数（“标记名”）

解析为参数标记名的值。对于本例的其余部分，我们将使用

Billto

作为标记名

“字段”：“[concat（'tags['，parameters（'tagName'），']]””

解析为

“字段”：“tags[Billto]”

“字段”：“tags[Billto]”

将获取

Billto

标记的值

如果资源没有

Billto

标记，则

Billto

标记将没有值，因此

“exists”：false将为true，策略将拒绝。如果
Billto
标记的值为空，则
的“等于”：“
将为真，策略将拒绝