我正在尝试登录到应用引擎的appengine并访问应用引擎中的用户服务API.基本上我希望能够看到谁登录到我的servlet.我正在使用从
android获取authtoken的身份验证流程,然后从app引擎获取ASID(或SACID)cookie.然后将cookie与http请求一起发送到appengine servlet.这似乎工作得很好,但是当我尝试使用此代码获取用户时：
UserService userService = UserServiceFactory.getUserService();
User user= userService.getCurrentUser();
user始终为null.我的问题是我在这里遗漏了什么？为什么用户服务返回空用户？下面是我的appengine和android代码.任何帮助将不胜感激！
应用引擎：
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代码：
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 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 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 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;
}
}
}
