content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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
   *
   *     http://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 org.apache.ambari.view.hello;
  
  import org.apache.ambari.view.ViewContext;
  import org.springframework.stereotype.Controller;
  import org.springframework.ui.ModelMap;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RequestMethod;
  
  import jakarta.servlet.http.HttpServletRequest;
  
  /**
   * Controller for the Hello Spring app view.
   */
  @Controller
  @RequestMapping(value = "/")
  public class HelloController {
  
    @RequestMapping(method = RequestMethod.GET)
    public String printHello(ModelMap model, HttpServletRequest request) {
  
      // get the view context from the servlet context
      ViewContext viewContext = (ViewContext) request.getSession().getServletContext().getAttribute(ViewContext.CONTEXT_ATTRIBUTE);
  
      // get the current user name from the view context
      String userName = viewContext.getUsername();
  
      // add the greeting message attribute
      model.addAttribute("greeting", "Hello " + (userName == null ? "unknown user" : userName) + "!");
  
      return "hello";
    }
  }
  