appengine-java-marketplace-openid-handler

gistfile1.java

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;

public class AuthServlet extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) {
      UserService userService = UserServiceFactory.getUserService();
      String url = userService.createLoginURL(request.getParameter("continue"), null, request.getParameter("domain"), null);
      response.setStatus(302);
      response.addHeader("Location", url);
    }
}