从 Cloud Functions for Firebase 中的数据库触发器获取用户 ID？

Question

在下面的示例中，有没有办法获取写入 /messages/{pushId}/original 的用户的 uid？

exports.makeUppercase = functions.database.ref('/messages/{pushId}/original')
.onWrite(event => {
  // Grab the current value of what was written to the Realtime Database.
  const original = event.data.val();
  console.log('Uppercasing', event.params.pushId, original);
  const uppercase = original.toUpperCase();
  // You must return a Promise when performing asynchronous tasks inside a Functions such as
  // writing to the Firebase Realtime Database.
  // Setting an "uppercase" sibling in the Realtime Database returns a Promise.
  return event.data.ref.parent.child('uppercase').set(uppercase);
});

Answer 1

更新的答案 (v1.0.0+):

有关详细信息，请参阅 , version 1.0.0 of the Firebase Functions SDK introduced a new context.auth object which contains the authentication state such as uid. See "New properties for user auth information"。

原始答案（v1.0.0 之前）：

是的，这在技术上是可行的，尽管目前没有记录。 uid 与 event.auth 对象一起存储。当从管理员情况（例如，从 Firebase 控制台数据查看器或从 Admin SDK）触发数据库云功能时，event.auth 的值为：

{
  "admin": true
}

当数据库云函数从未经身份验证的引用触发时，event.data 的值为：

{
  "admin": false
}

最后，当一个数据库云函数被授权的而非管理员引用触发时，event.auth 的格式是：

{
  "admin": false,
  "variable": {
    "provider": "<PROVIDER>",
    "provider_id": "<PROVIDER>",
    "user_id": "<UID>",
    "token": {
      // Decoded auth token claims such as sub, aud, iat, exp, etc.
    },
    "uid": "<UID>"
  }
}

根据以上信息，获取触发事件的用户的 uid 的最佳做法是执行以下操作：

exports.someFunction = functions.database.ref('/some/path')
  .onWrite(event => {
    var isAdmin = event.auth.admin;
    var uid = event.auth.variable ? event.auth.variable.uid : null;

    // ...
});

请注意，在上面的代码中，即使 isAdmin 是 true，uid 也会是 null。您的确切代码取决于您的用例。

警告： 这是目前未记录的行为，所以我会给出我通常的警告 "undocumented features may be changed at any point in the future without notice and even in non-major releases."

Answer 2

自从 Firebase 函数达到版本 1.0 以来，此行为不再是未记录的，但已略有更改。请务必阅读 the docs.

云函数已添加上下文，您可以这样使用

  exports.dbWrite = functions.database.ref('/path/with/{id}').onWrite((data, context) => {
  const authVar = context.auth; // Auth information for the user.
  const authType = context.authType; // Permissions level for the user.
  const pathId = context.params.id; // The ID in the Path.
  const eventId = context.eventId; // A unique event ID.
  const timestamp = context.timestamp; // The timestamp at which the event happened.
  const eventType = context.eventType; // The type of the event that triggered this function.
  const resource = context.resource; // The resource which triggered the event.
  // ...
});

从 Cloud Functions for Firebase 中的数据库触发器获取用户 ID？

Getting the user id from a database trigger in Cloud Functions for Firebase?

javascript

firebase

firebase-realtime-database

google-cloud-functions