// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.sps.servlets;

import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/login")
public class LoginServlet extends HttpServlet {

  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
    UserService userService = UserServiceFactory.getUserService();

    String loginUrl = userService.createLoginURL("/group.html");
    String logoutUrl = userService.createLogoutURL("/");

    String json;
    if (userService.isUserLoggedIn()) {
      json = String.format("{\"email\": \"%s\", \"url\": \"%s\"}",
                      userService.getCurrentUser().getEmail(), logoutUrl);
    } else {
      json = String.format("{\"email\": \"%s\", \"url\": \"%s\"}", 
                          "null", loginUrl);
    }

    // Send the JSON as the response
    response.setContentType("application/json;");
    response.getWriter().println(json);
  }
}
@@ -1263,18 +1263,8 @@
 L(%22/
-group.html
 %22);%0A
@@ -1397,32 +1397,41 @@
 = String.format(
+%0A        
 %22%7B%5C%22email%5C%22: %5C%22%25
@@ -1429,32 +1429,37 @@
 il%5C%22: %5C%22%25s%5C%22, %5C%22
+login
 url%5C%22: %5C%22%25s%5C%22%7D%22,
@@ -1459,33 +1459,61 @@
 %25s%5C%22
-%7D%22,%0A             
+, %5C%22logouturl%5C%22: %5C%22%25s%5C%22, %5C%22loggedIn%5C%22: %25b%7D%22,%0A
         
  use
@@ -1508,17 +1508,16 @@
         
- 
 userServ
@@ -1548,16 +1548,26 @@
 Email(),
+ loginUrl,
  logoutU
@@ -1568,16 +1568,22 @@
 ogoutUrl
+, true
 );%0A    %7D
@@ -1617,16 +1617,25 @@
 .format(
+%0A        
 %22%7B%5C%22emai
@@ -1649,16 +1649,21 @@
 %25s%5C%22, %5C%22
+login
 url%5C%22: %5C
@@ -1671,31 +1671,53 @@
 %25s%5C%22
-%7D%22, %0A                  
+, %5C%22logouturl%5C%22: %5C%22%25s%5C%22, %5C%22loggedIn%5C%22: %25b%7D%22,%0A
     
@@ -1736,16 +1736,34 @@
 loginUrl
+, logoutUrl, false
 );%0A    %7D

Change response of LoginServlet