Ionic2 Rest 认证

程序员文章站 2022-07-14 09:46:49

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今天，我们使用REST API实现用户名密码认证，服务端端点如下：

Endpoint 请求响应

/login	{ username: '',password: '' }	auth_token
/logout	add a token to headers
/register	{ username: '', password: '' }

1、创建Ionic 2 APP

反复练习，应该是很熟悉了：

ionic start Ionic2RestAuth --v2

我习惯上会先启动看看，确保项目创建成功：

cd Ionic2RestAuth
ionic serve --lab

看到如下界面应该就可以放心了：

Ionic应用界面

2、创建服务

我们需要创建一个服务来访问REST Api，命令如下：

ionic g provider AuthService

我们创建对应的方法来访问注册、登陆、登出REST。

修改 src/providers/auth-service.ts如下：

import { Injectable } from '@angular/core';
import { Http, Headers } from '@angular/http';
import 'rxjs/add/operator/map';

let apiUrl = 'http://localhost:8080/api/';

@Injectable()
export class AuthService {

  constructor(public http: Http) {}

  login(credentials) {
    return new Promise((resolve, reject) => {
        let headers = new Headers();
        headers.append('Content-Type', 'application/json');

        this.http.post(apiUrl+'login', JSON.stringify(credentials), {headers: headers})
          .subscribe(res => {
            resolve(res.json());
          }, (err) => {
            reject(err);
          });
    });
  }

  register(data) {
    return new Promise((resolve, reject) => {
        let headers = new Headers();
        headers.append('Content-Type', 'application/json');

        this.http.post(apiUrl+'guest/signup', JSON.stringify(data), {headers: headers})
          .subscribe(res => {
            resolve(res.json());
          }, (err) => {
            reject(err);
          });
    });
  }

  logout(){
    return new Promise((resolve, reject) => {
        let headers = new Headers();
        headers.append('X-Auth-Token', localStorage.getItem('token'));

        this.http.post(apiUrl+'logout', {}, {headers: headers})
          .subscribe(res => {
            localStorage.clear();
          }, (err) => {
            reject(err);
          });
    });
  }

}

接下来修改 src/app/app.module.ts 中的 import 和 @NgModule providers：

...
import { AuthService } from '../providers/auth-service';
...
providers: [{provide: ErrorHandler, useClass: IonicErrorHandler}, AuthService]
...

3、创建登陆和注册页面

我们需要创建相应的页面实现登陆和注册，如下命令将自动生成视图、控制器和样式文件：

ionic g page Login
ionic g page Register

修改' src/app/app.module.ts' wen文件如下：

import { LoginPage } from '../pages/login/login';
import { RegisterPage } from '../pages/register/register';

@NgModule({
  declarations: [
    MyApp,
    AboutPage,
    ContactPage,
    HomePage,
    TabsPage,
    LoginPage,
    RegisterPage
  ],
  imports: [
    IonicModule.forRoot(MyApp)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    AboutPage,
    ContactPage,
    HomePage,
    TabsPage,
    LoginPage,
    RegisterPage
  ],
  providers: [{provide: ErrorHandler, useClass: IonicErrorHandler}, AuthService]
})

修改 src/pages/login/login.ts 文件如下：

import { Component } from '@angular/core';
import { NavController, LoadingController, ToastController } from 'ionic-angular';
import { AuthService } from '../../providers/auth-service';
import { TabsPage } from '../tabs/tabs';
import { RegisterPage } from '../register/register';

@Component({
  selector: 'page-login',
  templateUrl: 'login.html'
})
export class LoginPage {

  loading: any;
  loginData = { username:'', password:'' };
  data: any;

  constructor(public navCtrl: NavController, public authService: AuthService, public loadingCtrl: LoadingController, private toastCtrl: ToastController) {}

  doLogin() {
    this.showLoader();
    this.authService.login(this.loginData).then((result) => {
      this.loading.dismiss();
      this.data = result;
      localStorage.setItem('token', this.data.access_token);
      this.navCtrl.setRoot(TabsPage);
    }, (err) => {
      this.loading.dismiss();
      this.presentToast(err);
    });
  }

  register() {
    this.navCtrl.push(RegisterPage);
  }

  showLoader(){
    this.loading = this.loadingCtrl.create({
        content: 'Authenticating...'
    });

    this.loading.present();
  }

  presentToast(msg) {
    let toast = this.toastCtrl.create({
      message: msg,
      duration: 3000,
      position: 'bottom',
      dismissOnPageChange: true
    });

    toast.onDidDismiss(() => {
      console.log('Dismissed toast');
    });

    toast.present();
  }

}

修改 pages/login/login.html 文件如下：

<ion-content padding>
  <h2>Please, Login</h2>
  <form (submit)="doLogin()">
    <ion-item>
      <ion-label stacked>Username</ion-label>
      <ion-input [(ngModel)]="loginData.username" name="username" type="text" placeholder="Username" ></ion-input>
    </ion-item>
    <ion-item>
      <ion-label stacked>Password</ion-label>
      <ion-input [(ngModel)]="loginData.password" name="password" type="password" placeholder="Password"></ion-input>
    </ion-item>
    <button ion-button block type="submit">
      Login
    </button>
  </form>

  <button ion-button block clear (click)="register()">
    No have an account? Register Now
  </button>
</ion-content>

修改 edit pages/register/register.ts 如下：

import { Component } from '@angular/core';
import { NavController, NavParams, LoadingController, ToastController } from 'ionic-angular';
import { AuthService } from '../../providers/auth-service';

@Component({
  selector: 'page-register',
  templateUrl: 'register.html'
})
export class RegisterPage {

  loading: any;
  regData = { username:'', password:'' };

  constructor(public navCtrl: NavController, public navParams: NavParams, public authService: AuthService, public loadingCtrl: LoadingController, private toastCtrl: ToastController) {}

  doSignup() {
    this.showLoader();
    this.authService.register(this.regData).then((result) => {
      this.loading.dismiss();
      this.navCtrl.pop();
    }, (err) => {
      this.loading.dismiss();
      this.presentToast(err);
    });
  }

  showLoader(){
    this.loading = this.loadingCtrl.create({
        content: 'Authenticating...'
    });

    this.loading.present();
  }

  presentToast(msg) {
    let toast = this.toastCtrl.create({
      message: msg,
      duration: 3000,
      position: 'bottom',
      dismissOnPageChange: true
    });

    toast.onDidDismiss(() => {
      console.log('Dismissed toast');
    });

    toast.present();
  }

}

修改 pages/register/register.html 如下：

<ion-content padding>
  <h2>Register Here</h2>
  <form (submit)="doSignup()">
    <ion-item>
      <ion-label stacked>Username</ion-label>
      <ion-input [(ngModel)]="regData.username" name="username" type="text" placeholder="Your username" ></ion-input>
    </ion-item>
    <ion-item>
      <ion-label stacked>Password</ion-label>
      <ion-input [(ngModel)]="regData.password" name="password" type="password" placeholder="Your password"></ion-input>
    </ion-item>
    <button ion-button block type="submit">
      SignUp
    </button>
  </form>
</ion-content>

4、登出和token检查

最后，在主页中添加一个退出登陆的功能，同时检查token，如果没有token跳转到登陆页面。

编辑 pages/tabs/tabs.ts 文件如下：

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { HomePage } from '../home/home';
import { AboutPage } from '../about/about';
import { ContactPage } from '../contact/contact';
import { LoginPage } from '../login/login';

@Component({
  templateUrl: 'tabs.html'
})
export class TabsPage {
  // this tells the tabs component which Pages
  // should be each tab's root Page
  tab1Root: any = HomePage;
  tab2Root: any = AboutPage;
  tab3Root: any = ContactPage;

  constructor(public navCtrl: NavController) {
    if(!localStorage.getItem("token")) {
      navCtrl.setRoot(LoginPage);
    }
  }
}

编辑 pages/home/home.ts 文件如下：

import { Component } from '@angular/core';
import { AuthService } from '../../providers/auth-service';
import { NavController, App, LoadingController, ToastController } from 'ionic-angular';
import { LoginPage } from '../login/login';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {

  loading: any;
  isLoggedIn: boolean = false;

  constructor(public app: App, public navCtrl: NavController, public authService: AuthService, public loadingCtrl: LoadingController, private toastCtrl: ToastController) {
    if(localStorage.getItem("token")) {
      this.isLoggedIn = true;
    }
  }

  logout() {
    this.authService.logout().then((result) => {
      this.loading.dismiss();
      let nav = this.app.getRootNav();
      nav.setRoot(LoginPage);
    }, (err) => {
      this.loading.dismiss();
      this.presentToast(err);
    });
  }

  showLoader(){
    this.loading = this.loadingCtrl.create({
        content: 'Authenticating...'
    });

    this.loading.present();
  }

  presentToast(msg) {
    let toast = this.toastCtrl.create({
      message: msg,
      duration: 3000,
      position: 'bottom',
      dismissOnPageChange: true
    });

    toast.onDidDismiss(() => {
      console.log('Dismissed toast');
    });

    toast.present();
  }

}

Home页面的登出按钮：

<ion-header>
  <ion-navbar>
    <button ion-button clear (click)="logout()">
      <ion-icon name="log-out"></ion-icon>
    </button>
    <ion-title>Home</ion-title>
  </ion-navbar>
</ion-header>