【Azure Developer】使用 Microsoft Authentication Libraries (MSAL) 如何来获取Token呢 (通过用

在上一篇博文《【Azure Developer】使用 adal4j(Azure Active Directory authentication library for Java)如何来获取Token呢 (通过用户名和密码方式获取Access Token)》中，介绍了使用ADAL4J SDK获取Access Token。而ADAL4J是非常旧的SDK，最新的SDK名称为 MSAL4J (Microsoft Authentication Libraries)，原来的AcquireToken的函数与现在的方式变动较大，不能直接修改POM.XML中依赖的方式来解决问题。

    /**
     * Acquires a security token from the authority using a Refresh Token
     * previously received.
     *
     * @param clientId
     *            Name or ID of the client requesting the token.
     * @param resource
     *            Identifier of the target resource that is the recipient of the
     *            requested token. If null, token is requested for the same
     *            resource refresh token was originally issued for. If passed,
     *            resource should match the original resource used to acquire
     *            refresh token unless token service supports refresh token for
     *            multiple resources.
     * @param username
     *            Username of the managed or federated user.
     * @param password
     *            Password of the managed or federated user.
     * @param callback
     *            optional callback object for non-blocking execution.
     * @return A {@link Future} object representing the
     *         {@link AuthenticationResult} of the call. It contains Access
     *         Token, Refresh Token and the Access Token's expiration time.
     */
    public Future<AuthenticationResult> acquireToken(final String resource,
            final String clientId, final String username,
            final String password, final AuthenticationCallback callback) {
        if (StringHelper.isBlank(resource)) {
            throw new IllegalArgumentException("resource is null or empty");
        }

        if (StringHelper.isBlank(clientId)) {
            throw new IllegalArgumentException("clientId is null or empty");
        }

        if (StringHelper.isBlank(username)) {
            throw new IllegalArgumentException("username is null or empty");
        }

        if (StringHelper.isBlank(password)) {
            throw new IllegalArgumentException("password is null or empty");
        }

        return this.acquireToken(new AdalAuthorizatonGrant(
                new ResourceOwnerPasswordCredentialsGrant(username, new Secret(
                        password)), resource), new ClientAuthenticationPost(
                ClientAuthenticationMethod.NONE, new ClientID(clientId)),
                callback);
    }

    public CompletableFuture<IAuthenticationResult> acquireToken(UserNamePasswordParameters parameters) {

        validateNotNull("parameters", parameters);

        UserNamePasswordRequest userNamePasswordRequest =
                new UserNamePasswordRequest(parameters,
                        this,
                        createRequestContext(PublicApi.ACQUIRE_TOKEN_BY_USERNAME_PASSWORD));

        return this.executeRequest(userNamePasswordRequest);
    }

    /**
     * Builder for UserNameParameters

     * @param scopes scopes application is requesting access to

     * @param username username of the account

     * @param password char array containing credentials for the username

     * @return builder object that can be used to construct UserNameParameters
     */
    public static UserNamePasswordParametersBuilder builder(Set<String> scopes, String username, char[] password) {
        validateNotEmpty("scopes", scopes);
        validateNotBlank("username", username);
        validateNotEmpty("password", password);
        return builder().scopes(scopes).username(username).password(password);
    }

那么，通过MSAL4J SDK，如何使用用户名，密码来获取到Access Token呢？

和使用ADAL4J一样，都是需要使用Azure AD中的用户，以及一个Azure AD 注册应用（此应用需要开启“Allow public client flows”功能），开启步骤见博文《【Azure Developer】使用 adal4j(Azure Active Directory authentication library for Java)如何来获取Token呢 (通过用户名和密码方式获取Access Token)》中。

package com.example;

import java.util.Collections;
import java.util.Set;
import com.microsoft.aad.msal4j.*;

/**
 * Hello world!
 *
 */
public class App {
    private static String authority  = "https://login.chinacloudapi.cn/<your tenant id>/";
    private static Set<String> scope  = Collections.singleton("https://ossrdbms-aad.database.chinacloudapi.cn/.default");
    private static String clientId ="Azure AD Application(Client) ID";
    private static String username ="AAD USER @XXXX.partner.onmschina.cn";
    private static String password = "USER PASSWORD";

    public static void main(String[] args) throws Exception {
        System.out.println("Hello World!");

        System.out.println("Hello App to get Token by Username & Password....");
        
        PublicClientApplication pca = PublicClientApplication.builder(clientId)
                .authority(authority)
                .build();

        //Get list of accounts from the application's token cache, and search them for the configured username
        //getAccounts() will be empty on this first call, as accounts are added to the cache when acquiring a token
        Set<IAccount> accountsInCache = pca.getAccounts().join();
        IAccount account = getAccountByUsername(accountsInCache, username);

        //Attempt to acquire token when user's account is not in the application's token cache
        IAuthenticationResult result = acquireTokenUsernamePassword(pca, scope, account, username, password);
        System.out.println("Account username: " + result.account().username());
        System.out.println("Access token:     " + result.accessToken());
        System.out.println("Id token:         " + result.idToken());
        System.out.println();

        accountsInCache = pca.getAccounts().join();
        account = getAccountByUsername(accountsInCache, username);

        //Attempt to acquire token again, now that the user's account and a token are in the application's token cache
        result = acquireTokenUsernamePassword(pca, scope, account, username, password);
        System.out.println("Account username: " + result.account().username());
        System.out.println("Access token:     " + result.accessToken());
        System.out.println("Id token:         " + result.idToken());

       
    }


    
 
    private static IAuthenticationResult acquireTokenUsernamePassword(PublicClientApplication pca,
                                                                      Set<String> scope,
                                                                      IAccount account,
                                                                      String username,
                                                                      String password) throws Exception {
        IAuthenticationResult result;
        try {
            SilentParameters silentParameters =
                    SilentParameters
                            .builder(scope)
                            .account(account)
                            .build();
            // Try to acquire token silently. This will fail on the first acquireTokenUsernamePassword() call
            // because the token cache does not have any data for the user you are trying to acquire a token for
            result = pca.acquireTokenSilently(silentParameters).join();
            System.out.println("==acquireTokenSilently call succeeded");
        } catch (Exception ex) {
            if (ex.getCause() instanceof MsalException) {
                System.out.println("==acquireTokenSilently call failed: " + ex.getCause());
                UserNamePasswordParameters parameters =
                        UserNamePasswordParameters
                                .builder(scope, username, password.toCharArray())
                                .build();
                // Try to acquire a token via username/password. If successful, you should see
                // the token and account information printed out to console
                result = pca.acquireToken(parameters).join();
                System.out.println("==username/password flow succeeded");
            } else {
                // Handle other exceptions accordingly
                throw ex;
            }
        }
        return result;
    }

        /**
     * Helper function to return an account from a given set of accounts based on the given username,
     * or return null if no accounts in the set match
     */
    private static IAccount getAccountByUsername(Set<IAccount> accounts, String username) {
        if (accounts.isEmpty()) {
            System.out.println("==No accounts in cache");
        } else {
            System.out.println("==Accounts in cache: " + accounts.size());
            for (IAccount account : accounts) {
                if (account.username().equals(username)) {
                    return account;
                }
            }
        }
        return null;
    }

    
}

在POM.XML文件中添加依赖Package：

    <dependency>
      <groupId>com.microsoft.azure</groupId>
      <artifactId>msal4j</artifactId>
      <version>1.0.0</version>
  </dependency>

注意：以上代码最关键的部分就是 UserNamePasswordParameters 的设置。scope 也是需要根据Token的资源而变动，如以上示例代码中使用的 https://ossrdbms-aad.database.chinacloudapi.cn/.default ， 而在adal4j的示例中，resource的值为：https://microsoftgraph.chinacloudapi.cn/。 

Caused by: com.microsoft.aad.adal4j.AuthenticationException: 
{"error_description":
"AADSTS65001: The user or administrator has not consented to use the application with ID 'xxxxxxxx-xxxx-4fa8-xxxx-xxxxxxxxxxxx' named 'xxxxtest01'. 
Send an interactive authorization request for this user and resource.\r\n
Trace ID:xxxxxx-xxx-xxx----xxxxxx\r\n
Correlation ID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx\r\n
Timestamp: 2022-05-05 08:16:16Z",
"error":"invalid_grant"}

此类问题的解决方法为：

1）进入Azure AD页面，找到当前User的登录日志信息(Sign-in logs)，查看失败的记录，在详细记录中，查看Status为 Interrupted的记录，找到 Resource 和Application 信息。在第二步中使用这两个信息。

2）回到Azure AD的注册应用页面，找到第一步中的Applicaiton，然后进入API Permission页面。在API Permission页面中点击“Add a Permission”，然后再“APIs my Organization uses”的文本框中输入“Azure OSSRDBMS Database”进行搜索，然后选中它，并赋予“Delegated  Permissions”权限。如下图：

Java console application letting users sign-in with username/password and call Microsoft Graph API：https://github.com/Azure-Samples/ms-identity-java-desktop/tree/da27a1af6064d5e833e645e5040a5120a0c2698f/Username-Password-Flow

Microsoft identity platform and OAuth 2.0 Resource Owner Password Credentials：https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth-ropc

使用 adal4j(Azure Active Directory authentication library for Java)如何来获取Token呢 (通过用户名和密码方式获取Access Token) : https://www.cnblogs.com/lulight/p/16212275.html

当在复杂的环境中面临问题，格物之道需：浊而静之徐清，安以动之徐生。 云中，恰是如此!