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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.web.servlets;
  
  import org.apache.atlas.AtlasErrorCode;
  import org.apache.atlas.exception.AtlasBaseException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import javax.ws.rs.HttpMethod;
  
  import java.io.PrintWriter;
  
  public class AtlasLoginServlet extends AtlasHttpServlet {
      public static final Logger LOG = LoggerFactory.getLogger(AtlasLoginServlet.class);
  
      public static final String LOGIN_HTML_TEMPLATE = "/login.html.template";
  
      @Override
      protected void service(HttpServletRequest request, HttpServletResponse response) {
          try {
              if (!request.getMethod().equals(HttpMethod.GET)) {
                  response.setContentType(TEXT_HTML);
                  response.setHeader(ALLOW, HttpMethod.GET);
                  response.setStatus(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
  
                  String      errorMessage = AtlasErrorCode.METHOD_NOT_ALLOWED.getFormattedErrorMessage(request.getMethod(), request.getRequestURI());
                  PrintWriter out          = response.getWriter();
  
                  out.println(errorMessage);
  
                  throw new AtlasBaseException(errorMessage);
              }
  
              includeResponse(request, response, LOGIN_HTML_TEMPLATE);
          } catch (Exception e) {
              LOG.error("Error in AtlasLoginServlet {}", LOGIN_HTML_TEMPLATE, e);
          }
      }
  }
  