从登录Android客户端到AppEngine上 [英] Login to appengine from android client

问题描述

我试图登录到AppEngine上到App Engine和应用程序引擎访问用户服务API。基本上，我希望能够看到谁在我的servlet的记录。我使用的由机器人得到的authToken认证流程，然后从流汗App Engine的一个ASID（或琥珀酰亚胺 - 酸）的cookie。该cookie然后用http请求向应用引擎Servlet发送。这似乎是所有工作正常，但是当我尝试让这个code用户：

I am attempting to login to appengine to app engine and access the User service API in app engine. Basically I want to be able to see who is logged in to my servlets. I am using the authentication flow of getting authtoken from android and then gettting a ASID(or SACID) cookie from app engine. The cookie is then sent with the http request to the appengine servlet. This seems to work all fine, however when I attempt to get the user with this code:

UserService userService = UserServiceFactory.getUserService();
User user= userService.getCurrentUser();

用户永远是零。我的问题是我失去了一些东西在这里？为什么用户服务返回一个空的用户？下面是我的AppEngine和Android code。任何帮助将大大AP preciated！

user is always null. My question is am I missing something here? Why is the user service returning a null user? Below is my appengine and android code. Any help would be greatly appreciated!

App Engine的：

App engine:

public class MyServlet extends HttpServlet {

public void process(HttpServletRequest req, HttpServletResponse resp)
throws IOException, ServletException {
 resp.setContentType("text/plain");

 UserService userService = UserServiceFactory.getUserService();
User user= userService.getCurrentUser();    
 }

public void doPost(HttpServletRequest req, HttpServletResponse resp)
 throws IOException, ServletException {
process(req, resp);
 }

public void doGet(HttpServletRequest req, HttpServletResponse resp)
 throws IOException, ServletException {
 process(req, resp);
 }
}

Android的code：

Android code:

public class AppEngineClient {
static final String BASE_URL = Util.getBaseUrl(this);
private static final String AUTH_URL = BASE_URL + "/_ah/login";
private static final String AUTH_TOKEN_TYPE = "ah";

private final Context mContext;
private final String mAccountName;

private static final String TAG = "AppEngineClient";

public AppEngineClient(Context context, String accountName) {
    this.mContext = context;
    this.mAccountName = accountName;
}

public HttpResponse makeRequest(String urlPath, List<NameValuePair> params) throws Exception {
    HttpResponse res = makeRequestNoRetry(urlPath, params, false);
    if (res.getStatusLine().getStatusCode() == 500) {
        res = makeRequestNoRetry(urlPath, params, true);
    }
    return res;
}

private HttpResponse makeRequestNoRetry(String urlPath, List<NameValuePair> params, boolean newToken)
        throws Exception {
    // Get auth token for account
    Account account = new Account(mAccountName, "com.google");
    String authToken = getAuthToken(mContext, account);

    if (newToken) {  // invalidate the cached token
        AccountManager accountManager = AccountManager.get(mContext);
        accountManager.invalidateAuthToken(account.type, authToken);
        authToken = getAuthToken(mContext, account);
    }

    // Get SACSID cookie
    DefaultHttpClient client = new DefaultHttpClient();
    String continueURL = BASE_URL;
    URI uri = new URI(AUTH_URL + "?continue=" +
            URLEncoder.encode(continueURL, "UTF-8") +
            "&auth=" + authToken);
    HttpGet method = new HttpGet(uri);
    final HttpParams getParams = new BasicHttpParams();
    HttpClientParams.setRedirecting(getParams, false);  // continue is not used
    method.setParams(getParams);

    HttpResponse res = client.execute(method);
    Header[] headers = res.getHeaders("Set-Cookie");
    if (res.getStatusLine().getStatusCode() != 302 ||
            headers.length == 0) {
        return res;
    }

    String sascidCookie = null;
    for (Header header: headers) {
        if (header.getValue().indexOf("SACSID=") >=0) {
            // let's parse it
            String value = header.getValue();
            String[] pairs = value.split(";");
            ascidCookie = pairs[0];
        }
    }

    // Make POST request
    uri = new URI(BASE_URL + urlPath);
    HttpPost post = new HttpPost(uri);
    UrlEncodedFormEntity entity =
        new UrlEncodedFormEntity(params, "UTF-8");
    post.setEntity(entity);
    post.setHeader("Cookie", ascidCookie);
    post.setHeader("X-Same-Domain", "1");  // XSRF
    res = client.execute(post);
    return res;
}

private String getAuthToken(Context context, Account account) throws PendingAuthException {
    String authToken = null;
    AccountManager accountManager = AccountManager.get(context);
    try {
        AccountManagerFuture<Bundle> future =
                accountManager.getAuthToken (account, AUTH_TOKEN_TYPE, false, null, null);
        Bundle bundle = future.getResult();
        authToken = bundle.getString(AccountManager.KEY_AUTHTOKEN);
        if (authToken == null) {
            throw new PendingAuthException(bundle);
        }
    } catch (OperationCanceledException e) {
        Log.w(TAG, e.getMessage());
    } catch (AuthenticatorException e) {
        Log.w(TAG, e.getMessage());
    } catch (IOException e) {
        Log.w(TAG, e.getMessage());
    }
    return authToken;
}

public class PendingAuthException extends Exception {
    private static final long serialVersionUID = 1L;
    private final Bundle mAccountManagerBundle;
    public PendingAuthException(Bundle accountManagerBundle) {
        super();
        mAccountManagerBundle = accountManagerBundle;
    }

    public Bundle getAccountManagerBundle() {
        return mAccountManagerBundle;
    }
}

}

推荐答案

而Android code以上获得来自谷歌帐户API一个ClientLogin的令牌。对于登录并获得通过 UserService 当前用户，在GAE应用必须是使用谷歌帐户API进行身份验证以及（应用程序设置 - >验证选项）。

The Android code above is getting a ClientLogin token from the Google Accounts API. For login and getting the current user via UserService, the GAE app must be using Google Accounts API for authentication as well ('Application settings'->'Authentication options').

这篇关于从登录Android客户端到AppEngine上的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！