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 backtype.storm.security.auth;
  
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.net.InetAddress;
  import com.google.common.annotations.VisibleForTesting;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.security.AccessControlContext;
  import java.security.AccessController;
  import java.security.Principal;
  import javax.security.auth.Subject;
  
  /**
   * context request context includes info about (1) remote address, (2) remote subject and primary principal (3) request ID
   */
  public class ReqContext {
      private static final AtomicInteger uniqueId = new AtomicInteger(0);
      private Subject _subject;
      private InetAddress _remoteAddr;
      private Integer _reqID;
      private Map _storm_conf;
      private Principal realPrincipal;
  
      private static final Logger LOG = LoggerFactory.getLogger(ReqContext.class);
  
      /**
       * Get a request context associated with current thread
       * 
       * @return
       */
      public static ReqContext context() {
          return ctxt.get();
      }
  
      // each thread will have its own request context
      private static final ThreadLocal<ReqContext> ctxt = new ThreadLocal<ReqContext>() {
          @Override
          protected ReqContext initialValue() {
              return new ReqContext(AccessController.getContext());
          }
      };
  
      // private constructor
      @VisibleForTesting
      public ReqContext(AccessControlContext acl_ctxt) {
          _subject = Subject.getSubject(acl_ctxt);
          _reqID = uniqueId.incrementAndGet();
      }
  
      // private constructor
      @VisibleForTesting
      public ReqContext(Subject sub) {
          _subject = sub;
          _reqID = uniqueId.incrementAndGet();
      }
  
      /**
       * client address
       */
      public void setRemoteAddress(InetAddress addr) {
          _remoteAddr = addr;
      }
  
      public InetAddress remoteAddress() {
          return _remoteAddr;
      }
  
      /**
       * Set remote subject explicitly
       */
      public void setSubject(Subject subject) {
          _subject = subject;
      }
  
      /**
       * Retrieve client subject associated with this request context
       */
      public Subject subject() {
          return _subject;
      }
  
      /**
       * The primary principal associated current subject
       */
      public Principal principal() {
          if (_subject == null)
              return null;
          Set<Principal> princs = _subject.getPrincipals();
          if (princs.size() == 0)
              return null;
          return (Principal) (princs.toArray()[0]);
      }
  
      public void setRealPrincipal(Principal realPrincipal) {
          this.realPrincipal = realPrincipal;
      }
  
      /**
       * The real principal associated with the subject.
       */
      public Principal realPrincipal() {
          return this.realPrincipal;
      }
  
      /**
       * Returns true if this request is an impersonation request.
       * 
       * @return
       */
      public boolean isImpersonating() {
          return this.realPrincipal != null;
      }
  
      /**
       * request ID of this request
       */
      public Integer requestID() {
          return _reqID;
      }
  
  }
  