在Firebase实时数据库中实现老化

问题描述：

不幸的是，Firebase没有开箱即用的老化机制(自动删除旧条目).因此，我正在尝试实现一个.但是，我陷入了两个决定之间:

Unfortunately, Firebase doesn't have out of the box an aging mechanism (delete old entries automatically). So, I am trying to implement one. However, I am stuck between two decisions:

如果客户获取旧条目，他将自动删除: 认为这对我而言是最简单的，但看起来并不十分确保我的安全.
在服务器上执行一个小的脚本/程序，该脚本/程序将检查完整的数据库并删除旧条目.

If a client fetch an old entry, he will delete automatically: I think it is the easiest for my context, but it doesn't look very secure to me.
Implement a small script/program on a server that will check the full database and delete old entries.

我喜欢第一个解决方案，因为它不包括部署另一个服务器端应用程序，但是我不知道它是否可能带来风险.

I like the first solution, since it doesn't include deploying another server side application but I don't know if it could represent a risk.

您认为最好的是什么? 如何确保第一个解决方案避免所有项目的任何可能删除? 对于第二种解决方案，我不会从计算机上运行脚本，也不想为部署该脚本而另外付费，是否有可能将其部署在Firebase上?

What do you think is the best ? How can I secure the first solution to avoid any possible deletion of all items ? For the second solution, I don't won't to run the script from my computer and I don't want to pay for another sever to deploy the script, it it possible to to deploy it on Firebase ?

答

以前已经介绍过从客户端删除过时的项目.参见:

Deleting outdated items from the client has been covered before. See:

Firebase聊天-删除旧消息
如何在"n"之后删除Firebase数据;天
删除早于2小时的Firebase数据

Firebase chat - removing old messages
How to delete firebase data after "n" days
Delete firebase data older than 2 hours

要确保此操作的安全性，以便只删除过时的项目，可以使用

To secure this operation so that only outdated items can be removed, you can use Firebase Database security rules. Something like:

{
  "rules": {
    "messages": {
      "$message": {
        // only messages older than an hours can be remove
        ".write": "newData.exists() || data.child('timestamp').val() < (now - 3600000)",
      }
    }
  }
}

现在可以通过 Firebase的云函数在Firebase的服务器上运行自己的代码. .还有一个示例，该示例显示了如何删除较旧的数据具有云功能.

Running your own code on Firebase's servers can now be done with Cloud Functions for Firebase. There is also a sample that shows how to delete older data with Cloud Functions.

在Firebase实时数据库中实现老化

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