OpenIdTestServlet.java

package com.shin1ogawa;

import java.io.IOException;
import java.util.Set;
import java.util.logging.*;

import javax.servlet.http.*;

import com.google.appengine.api.users.*;
import com.google.appengine.repackaged.com.google.common.collect.Sets;

@SuppressWarnings("serial")
public class OpenIdTestServlet extends HttpServlet {
  static final Logger LOGGER = Logger.getLogger(OpenIdTestServlet.class
      .getName());

  public void doGet(HttpServletRequest req, HttpServletResponse resp)
      throws IOException {
    UserService us = UserServiceFactory.getUserService();
    User currentUser = us.getCurrentUser();
    if (currentUser != null) {
      resp.setContentType("text/plain");
      resp.getWriter().println("Hello, " + currentUser.getEmail());
      resp.getWriter().print(
          "logoutUrl=" + us.createLogoutURL(req.getRequestURI()));
      return;
    }
    Set<String> attributes = Sets.newHashSet("openid.mode=checkid_immediate",
        "openid.ns=http://specs.openid.net/auth/2.0", "openid.return_to="
            + req.getRequestURI());
    String federatedIdentity = null;
    try {
      String url = us.createLoginURL(req.getRequestURI(), "shin1.appspot.com",
          federatedIdentity, attributes);
      LOGGER.info("loginurl=" + url);
      resp.sendRedirect(url);
    } catch (Throwable th) {
      LOGGER.log(Level.WARNING, "", th);
    }
  }
}