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使用 Azure Active Directory B2C 在你自己的 Node Web 应用程序中启用身份验证

项目
01/11/2024

本文将介绍如何在你自己的 Node.js Web 应用程序中添加 Azure Active Directory B2C (Azure AD B2C) 身份验证。你需要允许用户使用 Azure AD B2C 用户流登录、注销、更新个人资料和重置密码。本文使用适用于 Node 的 Microsoft 身份验证库 (MSAL) 来简化向 Node Web 应用程序添加身份验证的过程。

本文的目的是将你在使用 Azure AD B2C 在示例 Node.js Web 应用程序中配置身份验证中使用的示例应用程序替换为你自己的 Node.js Web 应用程序。

本文使用 Node.js 和 Express 创建基本的 Node.js Web 应用。该应用程序的视图使用 Handlebars。

先决条件

完成使用 Azure AD B2C 在示例 Node.js Web 应用程序中配置身份验证中的步骤。需创建 Azure AD B2C 用户流，并在 Azure 门户中注册 Web 应用程序。

步骤 1：创建 Node 项目

创建一个用于托管 node 应用程序的文件夹，例如 active-directory-b2c-msal-node-sign-in-sign-out-webapp。

在终端中，将目录更改为 Node 应用文件夹，例如 cd active-directory-b2c-msal-node-sign-in-sign-out-webapp，然后运行 npm init -y。此命令将为 Node.js 项目创建一个默认 package.json 文件。
在终端中，运行 npm install express。此命令安装 Express 框架。

创建更多文件夹和文件以实现以下项目结构：

active-directory-b2c-msal-node-sign-in-sign-out-webapp/
├── index.js
└── package.json
└── .env
└── views/
    └── layouts/
        └── main.hbs
    └── signin.hbs

views 文件夹包含应用 UI 的 Handlebars 文件。

步骤 2：安装应用依赖项

在终端中，通过运行以下命令来安装 dotenv、express-handlebars、express-session 和 @azure/msal-node 包：

npm install dotenv
npm install express-handlebars
npm install express-session
npm install @azure/msal-node

步骤 3：生成应用 UI 组件

在 main.hbs 文件中添加以下代码：

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, shrink-to-fit=no">
    <title>Tutorial | Authenticate users with MSAL for B2C</title>

    <!-- adding Bootstrap 4 for UI components  -->
    <!-- CSS only -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
    <link rel="SHORTCUT ICON" href="https://c.s-microsoft.com/favicon.ico?v2" type="image/x-icon">
  </head>
  <body>
    <nav class="navbar navbar-expand-lg navbar-dark bg-primary">
      <a class="navbar-brand" href="/">Microsoft Identity Platform</a>
        {{#if showSignInButton}}
            <div class="ml-auto">
                <a type="button" id="SignIn" class="btn btn-secondary" href="/signin" aria-haspopup="true" aria-expanded="false">
                    Sign in
                </a>
            </div>
        {{else}}
              <div class="ml-auto">
                  <a type="button" id="EditProfile" class="btn btn-warning" href="/profile" aria-haspopup="true" aria-expanded="false">
                      Edit profile
                  </a>
                  <a type="button" id="PasswordReset" class="btn btn-warning" href="/password" aria-haspopup="true" aria-expanded="false">
                      Reset password
                  </a>
              </div>

                <p class="navbar-brand d-flex ms-auto">Hi {{givenName}}</p>

                <a class="navbar-brand d-flex ms-auto" href="/signout">Sign out</a>
        {{/if}}
    </nav>
    <br>
    <h5 class="card-header text-center">MSAL Node Confidential Client application with Auth Code Flow</h5>
    <br>
    <div class="row" style="margin:auto" >
      {{{body}}}
    </div>
    <br>
    <br>
  </body>
</html>

main.hbs 文件位于 layout 文件夹中。它应包含整个应用程序所需的任何 HTML 代码。在不同视图中有变化的任何 UI（例如 signin.hbs 中的）放置在显示为 {{{body}}} 的占位符中。

main.hbs 文件可实现使用 Bootstrap 5 CSS 框架生成的 UI。你在登录时会看到“编辑密码”、“重置密码”和“注销”UI 组件（按钮）。你在注销后会看到“登录”。此行为由应用服务器发送的 showSignInButton 布尔变量控制。

在 signin.hbs 文件中添加以下代码：

<div class="col-md-3" style="margin:auto">
  <div class="card text-center">
    <div class="card-body">
      {{#if showSignInButton}}
          <h5 class="card-title">Please sign-in to acquire an ID token</h5>
      {{else}}
           <h5 class="card-title">You have signed in</h5>
      {{/if}}
    </div>

    <div class="card-body">
      {{#if message}}
          <h5 class="card-title text-danger">{{message}}</h5>
      {{/if}}
    </div>
  </div>
</div>

步骤 4：配置 Web 服务器和 MSAL 客户端

在 .env 文件中添加以下代码并更新它，如配置示例 Web 应用中解释的那样。

#HTTP port
SERVER_PORT=3000
#web apps client ID
APP_CLIENT_ID=<You app client ID here>
#session secret
SESSION_SECRET=sessionSecretHere
#web app client secret
APP_CLIENT_SECRET=<Your app client secret here>
#B2C sign up and sign in user flow/policy authority
SIGN_UP_SIGN_IN_POLICY_AUTHORITY=https://<your-tenant-name>.b2clogin.com/<your-tenant-name>.onmicrosoft.com/<sign-in-sign-up-user-flow-name>
#B2C password reset user flow/policy authority
RESET_PASSWORD_POLICY_AUTHORITY=https://<your-tenant-name>.b2clogin.com/<your-tenant-name>.onmicrosoft.com/<reset-password-user-flow-name>
#B2C edit profile user flow/policy authority
EDIT_PROFILE_POLICY_AUTHORITY=https://<your-tenant-name>.b2clogin.com/<your-tenant-name>.onmicrosoft.com/<profile-edit-user-flow-name>
#B2C authority domain
AUTHORITY_DOMAIN=https://<your-tenant-name>.b2clogin.com
#client redirect url
APP_REDIRECT_URI=http://localhost:3000/redirect
#Logout endpoint 
LOGOUT_ENDPOINT=https://<your-tenant-name>.b2clogin.com/<your-tenant-name>.onmicrosoft.com/<sign-in-sign-up-user-flow-name>/oauth2/v2.0/logout?post_logout_redirect_uri=http://localhost:3000

在 index.js 文件中，添加以下代码以使用应用依赖项：

require('dotenv').config();
const express = require('express');
const session = require('express-session');
const {engine}  = require('express-handlebars');
const msal = require('@azure/msal-node');

在 index.js 文件中，添加以下代码以配置身份验证库：

/**
 * Confidential Client Application Configuration
 */
 const confidentialClientConfig = {
    auth: {
        clientId: process.env.APP_CLIENT_ID, 
        authority: process.env.SIGN_UP_SIGN_IN_POLICY_AUTHORITY, 
        clientSecret: process.env.APP_CLIENT_SECRET,
        knownAuthorities: [process.env.AUTHORITY_DOMAIN], //This must be an array
        redirectUri: process.env.APP_REDIRECT_URI,
        validateAuthority: false
    },
    system: {
        loggerOptions: {
            loggerCallback(loglevel, message, containsPii) {
                console.log(message);
            },
            piiLoggingEnabled: false,
            logLevel: msal.LogLevel.Verbose,
        }
    }
};

// Initialize MSAL Node
const confidentialClientApplication = new msal.ConfidentialClientApplication(confidentialClientConfig);

confidentialClientConfig 是用于连接到 Azure AD B2C 租户的身份验证终结点的 MSAL 配置对象。

若要在 index.js 文件中添加更多全局变量，请添加以下代码：

/**
 * The MSAL.js library allows you to pass your custom state as state parameter in the Request object
 * By default, MSAL.js passes a randomly generated unique state parameter value in the authentication requests.
 * The state parameter can also be used to encode information of the app's state before redirect. 
 * You can pass the user's state in the app, such as the page or view they were on, as input to this parameter.
 * For more information, visit: https://docs.microsoft.com/azure/active-directory/develop/msal-js-pass-custom-state-authentication-request
 * In this scenario, the states also serve to show the action that was requested of B2C since only one redirect URL is possible. 
 */

const APP_STATES = {
    LOGIN: 'login',
    LOGOUT: 'logout',
    PASSWORD_RESET: 'password_reset',
    EDIT_PROFILE : 'update_profile'
}


/** 
 * Request Configuration
 * We manipulate these two request objects below 
 * to acquire a token with the appropriate claims.
 */
 const authCodeRequest = {
    redirectUri: confidentialClientConfig.auth.redirectUri,
};

const tokenRequest = {
    redirectUri: confidentialClientConfig.auth.redirectUri,
};

/**
 * Using express-session middleware. Be sure to familiarize yourself with available options
 * and set them as desired. Visit: https://www.npmjs.com/package/express-session
 */
 const sessionConfig = {
    secret: process.env.SESSION_SECRET,
    resave: false,
    saveUninitialized: false,
    cookie: {
        secure: false, // set this to true on production
    }
}

APP_STATES：用于通过标记请求来区分从 Azure AD B2C 收到的响应。对于发送到 Azure AD B2C 的任意数量的请求，只有一个重定向 URI。
authCodeRequest：用于检索授权代码的配置对象。
tokenRequest：用于通过授权代码获取令牌的配置对象。
sessionConfig：Express 会话的配置对象。

若要设置视图模板引擎和 Express 会话配置，请在 index.js 文件中添加以下代码：

 
//Create an express instance
const app = express();

//Set handlebars as your view engine
app.engine('.hbs', engine({extname: '.hbs'}));
app.set('view engine', '.hbs');
app.set("views", "./views");

//usse session configuration 
app.use(session(sessionConfig));

步骤 5：添加快速路由

在添加应用路由之前，请添加检索授权代码 URL 的逻辑，这是授权代码授予流的第一个分支。在 index.js 文件中添加以下代码：


/**
 * This method is used to generate an auth code request
 * @param {string} authority: the authority to request the auth code from 
 * @param {array} scopes: scopes to request the auth code for 
 * @param {string} state: state of the application
 * @param {Object} res: express middleware response object
 */
 const getAuthCode = (authority, scopes, state, res) => {

    // prepare the request
    console.log("Fetching Authorization code")
    authCodeRequest.authority = authority;
    authCodeRequest.scopes = scopes;
    authCodeRequest.state = state;

    //Each time you fetch Authorization code, update the relevant authority in the tokenRequest configuration
    tokenRequest.authority = authority;

    // request an authorization code to exchange for a token
    return confidentialClientApplication.getAuthCodeUrl(authCodeRequest)
        .then((response) => {
            console.log("\nAuthCodeURL: \n" + response);
            //redirect to the auth code URL/send code to 
            res.redirect(response);
        })
        .catch((error) => {
            res.status(500).send(error);
        });
}

authCodeRequest 对象具有属性 redirectUri、authority、scopes 和 state。该对象作为参数传递给 getAuthCodeUrl 方法。

在 index.js 文件中添加以下代码：

 app.get('/', (req, res) => {
    res.render('signin', { showSignInButton: true });
});

app.get('/signin',(req, res)=>{
        //Initiate a Auth Code Flow >> for sign in
        //no scopes passed. openid, profile and offline_access will be used by default.
        getAuthCode(process.env.SIGN_UP_SIGN_IN_POLICY_AUTHORITY, [], APP_STATES.LOGIN, res);
});

/**
 * Change password end point
*/
app.get('/password',(req, res)=>{
    getAuthCode(process.env.RESET_PASSWORD_POLICY_AUTHORITY, [], APP_STATES.PASSWORD_RESET, res); 
});

/**
 * Edit profile end point
*/
app.get('/profile',(req, res)=>{
    getAuthCode(process.env.EDIT_PROFILE_POLICY_AUTHORITY, [], APP_STATES.EDIT_PROFILE, res); 
});

/**
 * Sign out end point
*/
app.get('/signout',async (req, res)=>{    
    logoutUri = process.env.LOGOUT_ENDPOINT;
    req.session.destroy(() => {
        //When session destruction succeeds, notify B2C service using the logout uri.
        res.redirect(logoutUri);
    });
});

app.get('/redirect',(req, res)=>{
    
    //determine the reason why the request was sent by checking the state
    if (req.query.state === APP_STATES.LOGIN) {
        //prepare the request for authentication        
        tokenRequest.code = req.query.code;
        confidentialClientApplication.acquireTokenByCode(tokenRequest).then((response)=>{
        
        req.session.sessionParams = {user: response.account, idToken: response.idToken};
        console.log("\nAuthToken: \n" + JSON.stringify(response));
        res.render('signin',{showSignInButton: false, givenName: response.account.idTokenClaims.given_name});
        }).catch((error)=>{
            console.log("\nErrorAtLogin: \n" + error);
        });
    }else if (req.query.state === APP_STATES.PASSWORD_RESET) {
        //If the query string has a error param
        if (req.query.error) {
            //and if the error_description contains AADB2C90091 error code
            //Means user selected the Cancel button on the password reset experience 
            if (JSON.stringify(req.query.error_description).includes('AADB2C90091')) {
                //Send the user home with some message
                //But always check if your session still exists
                res.render('signin', {showSignInButton: false, givenName: req.session.sessionParams.user.idTokenClaims.given_name, message: 'User has cancelled the operation'});
            }
        }else{
            
            res.render('signin', {showSignInButton: false, givenName: req.session.sessionParams.user.idTokenClaims.given_name});
        }        
        
    }else if (req.query.state === APP_STATES.EDIT_PROFILE){
    
        tokenRequest.scopes = [];
        tokenRequest.code = req.query.code;
        
        //Request token with claims, including the name that was updated.
        confidentialClientApplication.acquireTokenByCode(tokenRequest).then((response)=>{
            req.session.sessionParams = {user: response.account, idToken: response.idToken};
            console.log("\AuthToken: \n" + JSON.stringify(response));
            res.render('signin',{showSignInButton: false, givenName: response.account.idTokenClaims.given_name});
        }).catch((error)=>{
            //Handle error
        });
    }else{
        res.status(500).send('We do not recognize this response!');
    }

});

快速路由包括：

/:
- 用于输入 Web 应用。
- 它呈现 signin 页面。
/signin:
- 登录时使用。
- 它调用 getAuthCode() 方法并向其传递“登录和注册”用户流/策略的 authority、APP_STATES.LOGIN 和一个空的 scopes 数组。
- 必要时，它会使系统质询你，要求你输入凭据。如果你没有帐户，它会提示你注册。
- 此路由生成的最终响应包括由 Azure AD B2C 发回到 /redirect 路由的授权代码。
/password:
- 重置密码时使用。
- 它调用 getAuthCode() 方法并向其传递“密码重置”用户流/策略的 authority、APP_STATES.PASSWORD_RESET 和一个空的 scopes 数组。
- 使用它，你可以通过密码重置体验来更改密码，也可以取消该操作。
- 此路由生成的最终响应包括由 Azure AD B2C 发回到 /redirect 路由的授权代码。如果取消该操作，则会发回一个错误。
/profile:
- 更新个人资料时使用。
- 它调用 getAuthCode() 方法并向其传递“个人资料编辑”用户流/策略的 authority、APP_STATES.EDIT_PROFILE 和一个空的 scopes 数组。
- 使用它，你可以更新个人资料。你使用个人资料编辑体验。
- 此路由生成的最终响应包括由 Azure AD B2C 发回到 /redirect 路由的授权代码。
/signout:
- 注销时使用。
- Web 应用会清除此会话，然后对 Azure AD B2C 注销终结点进行 HTTP 调用。
/redirect:
- 在 Azure 门户中设置为 Web 应用重定向 URI 的路由。
- 它使用来自 Azure AD B2C 的请求中的 state 查询参数来区分从 Web 应用发出的请求。它处理来自 Azure AD B2C 的所有重定向，但注销除外。
- 如果应用状态为 APP_STATES.LOGIN，则使用获取的授权代码通过 acquireTokenByCode() 方法检索令牌。此令牌包括 idToken 和 idTokenClaims，用于识别用户。
- 如果应用状态为 APP_STATES.PASSWORD_RESET，则它会处理任何错误，例如 user cancelled the operation。 AADB2C90091 错误代码会标识此错误。否则，它将确定下一个用户体验。
- 如果应用状态为 APP_STATES.EDIT_PROFILE，它将使用授权代码来获取令牌。令牌包含 idTokenClaims，后者包含新更改。

步骤 6：启动 Node 服务器

若要启动 Node 服务器，请在 index.js 文件中添加以下代码：

app.listen(process.env.SERVER_PORT, () => {
    console.log(`Msal Node Auth Code Sample app listening on port !` + process.env.SERVER_PORT);
});

在 index.js 文件中进行所有必需的更改后，它看起来应类似于以下文件：

/*
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
 //<ms_docref_use_app_dependencies>
require('dotenv').config();
const express = require('express');
const session = require('express-session');
const {engine}  = require('express-handlebars');
const msal = require('@azure/msal-node');
//</ms_docref_use_app_dependencies>

//<ms_docref_configure_msal>
/**
 * Confidential Client Application Configuration
 */
 const confidentialClientConfig = {
    auth: {
        clientId: process.env.APP_CLIENT_ID, 
        authority: process.env.SIGN_UP_SIGN_IN_POLICY_AUTHORITY, 
        clientSecret: process.env.APP_CLIENT_SECRET,
        knownAuthorities: [process.env.AUTHORITY_DOMAIN], //This must be an array
        redirectUri: process.env.APP_REDIRECT_URI,
        validateAuthority: false
    },
    system: {
        loggerOptions: {
            loggerCallback(loglevel, message, containsPii) {
                console.log(message);
            },
            piiLoggingEnabled: false,
            logLevel: msal.LogLevel.Verbose,
        }
    }
};

// Initialize MSAL Node
const confidentialClientApplication = new msal.ConfidentialClientApplication(confidentialClientConfig);
//</ms_docref_configure_msal>

//<ms_docref_global_variable>
/**
 * The MSAL.js library allows you to pass your custom state as state parameter in the Request object
 * By default, MSAL.js passes a randomly generated unique state parameter value in the authentication requests.
 * The state parameter can also be used to encode information of the app's state before redirect. 
 * You can pass the user's state in the app, such as the page or view they were on, as input to this parameter.
 * For more information, visit: https://docs.microsoft.com/azure/active-directory/develop/msal-js-pass-custom-state-authentication-request
 * In this scenario, the states also serve to show the action that was requested of B2C since only one redirect URL is possible. 
 */

const APP_STATES = {
    LOGIN: 'login',
    LOGOUT: 'logout',
    PASSWORD_RESET: 'password_reset',
    EDIT_PROFILE : 'update_profile'
}


/** 
 * Request Configuration
 * We manipulate these two request objects below 
 * to acquire a token with the appropriate claims.
 */
 const authCodeRequest = {
    redirectUri: confidentialClientConfig.auth.redirectUri,
};

const tokenRequest = {
    redirectUri: confidentialClientConfig.auth.redirectUri,
};

/**
 * Using express-session middleware. Be sure to familiarize yourself with available options
 * and set them as desired. Visit: https://www.npmjs.com/package/express-session
 */
 const sessionConfig = {
    secret: process.env.SESSION_SECRET,
    resave: false,
    saveUninitialized: false,
    cookie: {
        secure: false, // set this to true on production
    }
}

//</ms_docref_global_variable>

//<ms_docref_view_tepmplate_engine>
 
//Create an express instance
const app = express();

//Set handlebars as your view engine
app.engine('.hbs', engine({extname: '.hbs'}));
app.set('view engine', '.hbs');
app.set("views", "./views");

//usse session configuration 
app.use(session(sessionConfig));

//</ms_docref_view_tepmplate_engine>

//<ms_docref_authorization_code_url>

/**
 * This method is used to generate an auth code request
 * @param {string} authority: the authority to request the auth code from 
 * @param {array} scopes: scopes to request the auth code for 
 * @param {string} state: state of the application
 * @param {Object} res: express middleware response object
 */
 const getAuthCode = (authority, scopes, state, res) => {

    // prepare the request
    console.log("Fetching Authorization code")
    authCodeRequest.authority = authority;
    authCodeRequest.scopes = scopes;
    authCodeRequest.state = state;

    //Each time you fetch Authorization code, update the relevant authority in the tokenRequest configuration
    tokenRequest.authority = authority;

    // request an authorization code to exchange for a token
    return confidentialClientApplication.getAuthCodeUrl(authCodeRequest)
        .then((response) => {
            console.log("\nAuthCodeURL: \n" + response);
            //redirect to the auth code URL/send code to 
            res.redirect(response);
        })
        .catch((error) => {
            res.status(500).send(error);
        });
}
 
 //</ms_docref_authorization_code_url>

 
 //<ms_docref_app_endpoints>
 app.get('/', (req, res) => {
    res.render('signin', { showSignInButton: true });
});

app.get('/signin',(req, res)=>{
        //Initiate a Auth Code Flow >> for sign in
        //no scopes passed. openid, profile and offline_access will be used by default.
        getAuthCode(process.env.SIGN_UP_SIGN_IN_POLICY_AUTHORITY, [], APP_STATES.LOGIN, res);
});

/**
 * Change password end point
*/
app.get('/password',(req, res)=>{
    getAuthCode(process.env.RESET_PASSWORD_POLICY_AUTHORITY, [], APP_STATES.PASSWORD_RESET, res); 
});

/**
 * Edit profile end point
*/
app.get('/profile',(req, res)=>{
    getAuthCode(process.env.EDIT_PROFILE_POLICY_AUTHORITY, [], APP_STATES.EDIT_PROFILE, res); 
});

/**
 * Sign out end point
*/
app.get('/signout',async (req, res)=>{    
    logoutUri = process.env.LOGOUT_ENDPOINT;
    req.session.destroy(() => {
        //When session destruction succeeds, notify B2C service using the logout uri.
        res.redirect(logoutUri);
    });
});

app.get('/redirect',(req, res)=>{
    
    //determine the reason why the request was sent by checking the state
    if (req.query.state === APP_STATES.LOGIN) {
        //prepare the request for authentication        
        tokenRequest.code = req.query.code;
        confidentialClientApplication.acquireTokenByCode(tokenRequest).then((response)=>{
        
        req.session.sessionParams = {user: response.account, idToken: response.idToken};
        console.log("\nAuthToken: \n" + JSON.stringify(response));
        res.render('signin',{showSignInButton: false, givenName: response.account.idTokenClaims.given_name});
        }).catch((error)=>{
            console.log("\nErrorAtLogin: \n" + error);
        });
    }else if (req.query.state === APP_STATES.PASSWORD_RESET) {
        //If the query string has a error param
        if (req.query.error) {
            //and if the error_description contains AADB2C90091 error code
            //Means user selected the Cancel button on the password reset experience 
            if (JSON.stringify(req.query.error_description).includes('AADB2C90091')) {
                //Send the user home with some message
                //But always check if your session still exists
                res.render('signin', {showSignInButton: false, givenName: req.session.sessionParams.user.idTokenClaims.given_name, message: 'User has cancelled the operation'});
            }
        }else{
            
            res.render('signin', {showSignInButton: false, givenName: req.session.sessionParams.user.idTokenClaims.given_name});
        }        
        
    }else if (req.query.state === APP_STATES.EDIT_PROFILE){
    
        tokenRequest.scopes = [];
        tokenRequest.code = req.query.code;
        
        //Request token with claims, including the name that was updated.
        confidentialClientApplication.acquireTokenByCode(tokenRequest).then((response)=>{
            req.session.sessionParams = {user: response.account, idToken: response.idToken};
            console.log("\AuthToken: \n" + JSON.stringify(response));
            res.render('signin',{showSignInButton: false, givenName: response.account.idTokenClaims.given_name});
        }).catch((error)=>{
            //Handle error
        });
    }else{
        res.status(500).send('We do not recognize this response!');
    }

});

 //</ms_docref_app_endpoints>
//start app server to listen on set port
 //<ms_docref_start_node_server>
app.listen(process.env.SERVER_PORT, () => {
    console.log(`Msal Node Auth Code Sample app listening on port !` + process.env.SERVER_PORT);
});
//</ms_docref_start_node_server>

步骤 7：运行 Web 应用

按照运行 Web 应用中的步骤测试 Node.js Web 应用。

后续步骤

了解如何自定义和增强 Web 应用的 Azure AD B2C 身份验证体验