ionic，firebase：如何从 firebase 身份验证获取所有用户电子邮件

Question

我正在尝试获取我的 firebase 身份验证存储中所有用户的用户电子邮件，我需要此信息以便我可以允许用户在系统内互相发送消息。我对离子不是很有经验所以如果这是一个愚蠢的问题请原谅我。我不需要登录用户的电子邮件，我已经可以访问它但是无法访问所有这些。

登录码，不确定是否需要。

// login.page.ts
import { Component, OnInit } from '@angular/core';
import { FormGroup, FormBuilder, Validators, FormControl } from '@angular/forms';
import { NavController } from '@ionic/angular';
import { AuthenticationService } from '../services/authentication.service';

@Component({
  selector: 'app-login',
  templateUrl: './login.page.html',
  styleUrls: ['./login.page.scss'],
})
export class LoginPage implements OnInit {

  validations_form: FormGroup;
  errorMessage: string = '';

  constructor(

    private navCtrl: NavController,
    private authService: AuthenticationService,
    private formBuilder: FormBuilder

  ) { }

  ngOnInit() {

    this.validations_form = this.formBuilder.group({
      email: new FormControl('', Validators.compose([
        Validators.required,
        Validators.pattern('^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+$')
      ])),
      password: new FormControl('', Validators.compose([
        Validators.minLength(5),
        Validators.required
      ])),
    });
  }


  validation_messages = {
    'email': [
      { type: 'required', message: 'Email is required.' },
      { type: 'pattern', message: 'Please enter a valid email.' }
    ],
    'password': [
      { type: 'required', message: 'Password is required.' },
      { type: 'minlength', message: 'Password must be at least 5 characters long.' }
    ]
  };


  loginUser(value) {
    this.authService.loginUser(value)
      .then(res => {
        console.log(res);
        this.errorMessage = "";
        this.navCtrl.navigateForward('/welcome');
      }, err => {
        this.errorMessage = err.message;
      })
  }

  goToRegisterPage() {
    this.navCtrl.navigateForward('/register');
  }

}

注册码

// register.page.ts
import { Component, OnInit } from '@angular/core';
import { FormGroup, FormBuilder, Validators, FormControl } from '@angular/forms';
import { AuthenticationService } from '../services/authentication.service';
import { NavController } from '@ionic/angular';

@Component({
  selector: 'app-register',
  templateUrl: './register.page.html',
  styleUrls: ['./register.page.scss'],
})
export class RegisterPage implements OnInit {


  validations_form: FormGroup;
  errorMessage: string = '';
  successMessage: string = '';

  validation_messages = {
    'email': [
      { type: 'required', message: 'Email is required.' },
      { type: 'pattern', message: 'Enter a valid email.' }
    ],
    'password': [
      { type: 'required', message: 'Password is required.' },
      { type: 'minlength', message: 'Password must be at least 5 characters long.' }
    ]
  };

  constructor(
    private navCtrl: NavController,
    private authService: AuthenticationService,
    private formBuilder: FormBuilder
  ) { }

  ngOnInit() {
    this.validations_form = this.formBuilder.group({
      email: new FormControl('', Validators.compose([
        Validators.required,
        Validators.pattern('^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+$')
      ])),
      password: new FormControl('', Validators.compose([
        Validators.minLength(5),
        Validators.required
      ])),
    });
  }

  tryRegister(value) {
    this.authService.registerUser(value)
      .then(res => {
        console.log(res);
        this.errorMessage = "";
        this.successMessage = "Your account has been created. Please log in.";
      }, err => {
        console.log(err);
        this.errorMessage = err.message;
        this.successMessage = "";
      })
  }

  goLoginPage() {
    this.navCtrl.navigateForward('/login');
  }


}

我想要得到的东西类似于

用户点击了 list/options
用户选择一封电子邮件
键入任何消息内容he/she 想要分享，我将分享一个小片段

<ion-select>
    <ion-select-option value="email1">email1</ion-select-option>
    <ion-select-option value="email2">email2</ion-select-option>
    <ion-select-option value="email3">email3</ion-select-option>
    <ion-select-option value="email4">email4/ion-select-option>
  </ion-select> //probably will use *ngFor to do this.

authentication service screenshot

Answer 1

客户端 Firebase Authentication SDK 无法获取系统中所有用户的电子邮件地址，因为这会存在潜在的安全风险。

如果您的应用需要此功能，则必须自行构建。两个最常见的选项是：

实施自定义服务器端 API，它使用具有此类功能的 Firebase Admin SDK。
将必要的用户数据存储在数据库中，例如 Firebase 的实时数据库或 Cloud Firestore，并让客户端在那里访问它。

在这两种情况下，您的应用程序 控制公开哪些有关您用户的数据，这解决了安全问题。

另见：

Retrieving a list of users who have registered using Firebase Auth
How to fetch all registered authentication emails in firebase

ionic，firebase：如何从 firebase 身份验证获取所有用户电子邮件

ionic, firebase: How to get ALL user emails from firebase authentication

javascript

firebase

ionic-framework

firebase-authentication

ionic4