如何从Credential对象获取用户ID令牌？

Question

我一直在关注本教程,将Google登录支持包含在我的桌面应用中.我正在使用的图书馆是这个.

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,从一个Credential对象,我只能通过调用来检索访问令牌Credential.getAccessToken(),但我需要的是id token.如何在用户通过身份验证后从用户检索id_token？

Answer 1

在开始赏金之后,我确实想出来了!通过继承AuthorizedCodeInstalledApp并提供自己的实现,可以获得Id令牌authorize()

这就是我做的......

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();
        }
    }

}

在你这样做之后,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

我找到的这个解决方案是通过添加一个CredentialCreatedListener和一个CredentialRefreshListener内部的工作GoogleAuthorizationCodeFlow.Builder.

这是示例代码:

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Credential通过调用创建或刷新new时credential.refreshToken(),将通知侦听器并id_token从中获取TokenResponse(实际上是GoogleTokenResponse包含id_token字段的对象),并且我们将使用默认值DataStoreFactory来保存id_token.在id_token现在将在当地持续存在,并将于每当听众自动更新credential.refreshToken()被调用.