Question

我一直在关注this教程，将Google登录支持包含在我的桌面应用中。我正在使用的库是this one。

一切正常，这是authorize()方法的实现：

public Credential authorize() throws IOException {
    // Load client secrets.
    InputStream in = GoogleLogin.class.getResourceAsStream("/google/client_secret.json");
    GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));

    // Build flow and trigger user authorization request.
    GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
            HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)
            .setDataStoreFactory(DATA_STORE_FACTORY)
            .setAccessType("offline")
            .build();

    Credential credential = new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");

    System.out.println("Credentials saved to " + DATA_STORE_DIR.getAbsolutePath());
    return credential;
}

但是，从Credential对象，我只能通过调用Credential.getAccessToken()来检索访问令牌，但我需要的是id token。如何在用户通过身份验证后检索id_token？

Answer 1

我在开始赏金之后就明白了！通过继承AuthorizedCodeInstalledApp并提供您自己的authorize()实现

，可以获取Id令牌

这就是我所做的......

public class GoogleAuthCodeInstalledApp extends AuthorizationCodeInstalledApp {

    public GoogleAuthCodeInstalledApp(AuthorizationCodeFlow flow, VerificationCodeReceiver receiver) {
        super(flow, receiver);
    }

    @Override
    public Credential authorize(String userId) throws IOException {
        try {
            Credential credential = getFlow().loadCredential(userId);
            if (credential != null
                    && (credential.getRefreshToken() != null
                    || credential.getExpiresInSeconds() == null
                    || credential.getExpiresInSeconds() > 60)) {
                return credential;
            }
            // open in browser
            String redirectUri = getReceiver().getRedirectUri();
            AuthorizationCodeRequestUrl authorizationUrl
                    = getFlow().newAuthorizationUrl().setRedirectUri(redirectUri);
            onAuthorization(authorizationUrl);
            // receive authorization code and exchange it for an access token
            String code = getReceiver().waitForCode();
            GoogleTokenResponse response = (GoogleTokenResponse) getFlow().newTokenRequest(code).setRedirectUri(redirectUri).execute();
            System.out.println(response.getIdToken()); //YES, THIS IS THE ID TOKEN!!!
            // store credential and return it
            return getFlow().createAndStoreCredential(response, userId);
        } finally {
            getReceiver().stop();
        }
    }

}

执行此操作后，而不是

Credential credential = new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");

使用：

Credential credential = new GoogleAuthCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");

更新2018-05-29 - 我找到了更好，更可靠的解决方案

我发现这个解决方案的工作原理是在CredentialCreatedListener内添加CredentialRefreshListener和GoogleAuthorizationCodeFlow.Builder。

以下是示例代码：

public Credential authorize() throws IOException {
    InputStream in = GoogleLogin.class.getResourceAsStream("/google/client_secret.json");
    GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
    // Build flow and trigger user authorization request.
    flow = new GoogleAuthorizationCodeFlow.Builder(
            HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)
            .setDataStoreFactory(DATA_STORE_FACTORY)
            .setAccessType("offline")
            .setCredentialCreatedListener(new AuthorizationCodeFlow.CredentialCreatedListener() {
                @Override
                public void onCredentialCreated(Credential credential, TokenResponse tokenResponse) throws IOException {
                    DATA_STORE_FACTORY.getDataStore("user").set("id_token", tokenResponse.get("id_token").toString());
                }
            })
            .addRefreshListener(new CredentialRefreshListener() {
                @Override
                public void onTokenResponse(Credential credential, TokenResponse tokenResponse) throws IOException {
                    DATA_STORE_FACTORY.getDataStore("user").set("id_token", tokenResponse.get("id_token").toString());
                }

                @Override
                public void onTokenErrorResponse(Credential credential, TokenErrorResponse tokenErrorResponse) throws IOException {
                    //handle token error response
                }
            })
            .build();

    Credential credential = new AuthorizationCodeInstalledApp(flow, serverReceiver).authorize("user");
    System.out.println("Credentials saved to " + DATA_STORE_DIR.getAbsolutePath());
    return credential;
}

代码几乎是不言自明的。每当通过调用Credential创建或刷新新credential.refreshToken()时，将通知听众，id_token将从TokenResponse（实际上是{{1}包含GoogleTokenResponse字段的对象），我们将使用默认id_token来保存DataStoreFactory。 id_token现在将在本地保留，并且每当调用id_token时，听众都会自动更新。{/ p>

如何从Credential对象获取用户ID令牌？

1 个答案:

更新2018-05-29 - 我找到了更好，更可靠的解决方案