code: /**
   * 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.cxf.ws.security.wss4j.policyvalidators;
  
  import java.util.Collection;
  import java.util.List;
  
  import org.w3c.dom.Element;
  
  import org.apache.cxf.message.Message;
  import org.apache.cxf.ws.policy.AssertionInfo;
  import org.apache.cxf.ws.policy.AssertionInfoMap;
  import org.apache.cxf.ws.security.policy.SP12Constants;
  import org.apache.cxf.ws.security.policy.model.SymmetricBinding;
  import org.apache.ws.security.WSConstants;
  import org.apache.ws.security.WSSecurityEngineResult;
  
  /**
   * Validate a SymmetricBinding policy.
   */
  public class SymmetricBindingPolicyValidator extends AbstractBindingPolicyValidator {
      
      public boolean validatePolicy(
          AssertionInfoMap aim,
          Message message,
          Element soapBody,
          List<WSSecurityEngineResult> results,
          List<WSSecurityEngineResult> signedResults,
          List<WSSecurityEngineResult> encryptedResults
      ) {
          Collection<AssertionInfo> ais = aim.get(SP12Constants.SYMMETRIC_BINDING);
          if (ais == null || ais.isEmpty()) {                       
              return true;
          }
          
          boolean hasDerivedKeys = false;
          for (WSSecurityEngineResult result : results) {
              Integer actInt = (Integer)result.get(WSSecurityEngineResult.TAG_ACTION);
              if (actInt.intValue() == WSConstants.DKT) {
                  hasDerivedKeys = true;
                  break;
              }
          }
          
          for (AssertionInfo ai : ais) {
              SymmetricBinding binding = (SymmetricBinding)ai.getAssertion();
              ai.setAsserted(true);
  
              // Check the protection order
              if (!checkProtectionOrder(binding, ai, results)) {
                  continue;
              }
              
              // Check various properties of the binding
              if (!checkProperties(binding, ai, aim, results, signedResults, message)) {
                  continue;
              }
              
              // Check various tokens of the binding
              if (!checkTokens(binding, ai, aim, hasDerivedKeys, signedResults, encryptedResults)) {
                  continue;
              }
          }
          
          return true;
      }
      
      /**
       * Check various tokens of the binding
       */
      private boolean checkTokens(
          SymmetricBinding binding, 
          AssertionInfo ai,
          AssertionInfoMap aim,
          boolean hasDerivedKeys,
          List<WSSecurityEngineResult> signedResults,
          List<WSSecurityEngineResult> encryptedResults
      ) {
          if (binding.getEncryptionToken() != null) {
              assertPolicy(aim, binding.getEncryptionToken());
              if (!checkDerivedKeys(
                  binding.getEncryptionToken(), hasDerivedKeys, signedResults, encryptedResults
              )) {
                  ai.setNotAsserted("Message fails the DerivedKeys requirement");
                  return false;
              }
          }
          
          if (binding.getSignatureToken() != null) {
              assertPolicy(aim, binding.getSignatureToken());
              if (!checkDerivedKeys(
                  binding.getSignatureToken(), hasDerivedKeys, signedResults, encryptedResults
              )) {
                  ai.setNotAsserted("Message fails the DerivedKeys requirement");
                  return false;
              }
          }
          
          if (binding.getProtectionToken() != null) {
              assertPolicy(aim, binding.getProtectionToken());
              if (!checkDerivedKeys(
                  binding.getProtectionToken(), hasDerivedKeys, signedResults, encryptedResults
              )) {
                  ai.setNotAsserted("Message fails the DerivedKeys requirement");
                  return false;
              }
          }
          
          return true;
      }
      
  }
  