text: /*
   * Copyright 2020 ThoughtWorks, Inc.
   *
   * 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
   *
   *     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 com.thoughtworks.go.server.newsecurity.filters;
  
  import com.thoughtworks.go.server.newsecurity.models.AnonymousCredential;
  import com.thoughtworks.go.server.newsecurity.providers.AnonymousAuthenticationProvider;
  import com.thoughtworks.go.server.newsecurity.utils.SessionUtils;
  import com.thoughtworks.go.server.service.SecurityService;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Component;
  import org.springframework.web.filter.OncePerRequestFilter;
  
  import javax.servlet.FilterChain;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import java.io.IOException;
  
  @Component
  public class AssumeAnonymousUserFilter extends OncePerRequestFilter {
      private static final Logger LOGGER = LoggerFactory.getLogger(AssumeAnonymousUserFilter.class);
      private final SecurityService securityService;
  
  
      private final AnonymousAuthenticationProvider anonymousAuthenticationProvider;
  
      @Autowired
      public AssumeAnonymousUserFilter(SecurityService securityService,
                                       AnonymousAuthenticationProvider anonymousAuthenticationProvider) {
          this.securityService = securityService;
          this.anonymousAuthenticationProvider = anonymousAuthenticationProvider;
      }
  
      @Override
      protected void doFilterInternal(HttpServletRequest request,
                                      HttpServletResponse response,
                                      FilterChain filterChain) throws ServletException, IOException {
          if (!securityService.isSecurityEnabled()) {
              LOGGER.debug("Security is disabled.");
              authenticateAsAnonymous(request);
          } else if (SessionUtils.hasAuthenticationToken(request)) {
              LOGGER.debug("Already authenticated request.");
          } else {
              LOGGER.debug("Security is enabled.");
              authenticateAsAnonymous(request);
          }
  
          LOGGER.debug("User authenticated as anonymous user {}", SessionUtils.getAuthenticationToken(request));
          filterChain.doFilter(request, response);
  
      }
  
      private void authenticateAsAnonymous(HttpServletRequest request) {
          SessionUtils.setAuthenticationTokenWithoutRecreatingSession(anonymousAuthenticationProvider.authenticate(AnonymousCredential.INSTANCE, null), request);
      }
  }
  