如何在Firebase规则中验证位置路径？

Question

我想验证$username长度超过5个字符且短于24个字符

{
    "rules": {
        "user": {
            "$username": {
                ".write": "auth != null",
                "uid": {},
                "created": {},
                "lastlogin": {}
            }
        }
    }
}

（如果可能的话）我该怎么做？

Answer 1

是的，有可能：

{
    "rules": {
        "user": {
            "$username": {
                ".write": "auth != null",
                ".validate":"newData.hasChildren(['validate_username'])",
                "validate_username":{
                    ".validate":"
                        newData.val() == $username
                        && newData.val().length > 5
                        && newData.val().length < 24
                    "
                },
                "uid": {},
                "created": {},
                "lastlogin": {}
            }
        }
    }
}

Answer 2

您可以使用正则表达式验证$ username

<dist:module dist:instant="true" />