content: /**
   * 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 org.apache.aurora.scheduler.http.api.security;
  
  import java.io.IOException;
  
  import javax.inject.Inject;
  import javax.inject.Provider;
  import javax.servlet.FilterChain;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.shiro.authz.UnauthenticatedException;
  import org.apache.shiro.subject.Subject;
  
  /**
   * Allows unauthenticated requests to proceed. It's up to the decorated RPCs to enforce auth
   * requirement by throwing {@link UnauthenticatedException}.
   */
  public class ShiroKerberosPermissiveAuthenticationFilter extends ShiroKerberosAuthenticationFilter {
    @Inject
    ShiroKerberosPermissiveAuthenticationFilter(Provider<Subject> subjectProvider) {
      super(subjectProvider);
    }
  
    @Override
    protected void handleUnauthenticated(
        HttpServletRequest request,
        HttpServletResponse response,
        FilterChain chain) throws IOException, ServletException {
  
      // Incoming request is unauthenticated, but some RPCs might be okay with that.
      try {
        chain.doFilter(request, response);
      } catch (UnauthenticatedException e) {
        super.handleUnauthenticated(request, response, chain);
      }
    }
  }
  