1. 在 Firebase 控制台中为您的应用程序设置规则以保护数据。例如，您可以为数据库设置以下规则：

{
  "rules": {
    ".read": "auth != null",
    ".write": "auth != null"
  }
}

2. 在您的 Angular 应用程序中，使用 Firebase Auth 模块登录用户并获取令牌：

import { AngularFireAuth } from '@angular/fire/auth';

constructor(private afAuth: AngularFireAuth) {}

login() {
  this.afAuth.signInWithEmailAndPassword(email, password)
    .then((userCredential) => {
      const token = userCredential.user.getIdToken();
      // token can be passed to Firebase rules when reading/writing data
    });
}

3. 在读/写 Firebase 数据时，使用令牌来授权用户的访问权限：

import { AngularFireDatabase } from '@angular/fire/database';

constructor(
  private db: AngularFireDatabase,
  private afAuth: AngularFireAuth
) {}

writeData() {
  this.afAuth.currentUser.getIdToken()
    .then((token) => {
      this.db.object('path/to/data').set({
        some: 'data',
        userId: this.afAuth.currentUser.uid
      }, {
        // pass token as auth
        queryParams: {
          auth: token
        }
      });
    });
}

readData() {
  this.afAuth.currentUser.getIdToken()
    .then((token) => {
      this.db.object('path/to/data').query({
        // pass token as auth
        queryParams: {
          auth: token
        }
      }).valueChanges().subscribe((data) => {
        console.log(data);
      });
    });
}