/**
    * 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.wss4j.policy.stax.assertionStates;
  
  import javax.xml.namespace.QName;
  
  import org.apache.wss4j.common.WSSPolicyException;
  import org.apache.wss4j.policy.SPConstants;
  import org.apache.wss4j.policy.model.AbstractSecurityAssertion;
  import org.apache.wss4j.policy.model.AbstractToken;
  import org.apache.wss4j.policy.model.KerberosToken;
  import org.apache.wss4j.policy.stax.PolicyAsserter;
  import org.apache.wss4j.stax.securityToken.KerberosServiceSecurityToken;
  import org.apache.wss4j.stax.securityToken.WSSecurityTokenConstants;
  import org.apache.xml.security.stax.securityEvent.SecurityEventConstants;
  import org.apache.xml.security.stax.securityEvent.TokenSecurityEvent;
  import org.apache.xml.security.stax.securityToken.SecurityToken;
  import org.apache.xml.security.stax.securityToken.SecurityTokenConstants.KeyIdentifier;
  import org.apache.wss4j.stax.securityEvent.KerberosTokenSecurityEvent;
  import org.apache.wss4j.stax.securityEvent.WSSecurityEventConstants;
  
  /**
   * WSP1.3, 5.4.4 KerberosToken Assertion
   */
  
  public class KerberosTokenAssertionState extends TokenAssertionState {
  
      public KerberosTokenAssertionState(AbstractSecurityAssertion assertion, boolean asserted,
                                         PolicyAsserter policyAsserter, boolean initiator) {
          super(assertion, asserted, policyAsserter, initiator);
  
          if (asserted) {
              KerberosToken token = (KerberosToken) getAssertion();
              String namespace = token.getName().getNamespaceURI();
              if (token.isRequireKeyIdentifierReference()) {
                  getPolicyAsserter().assertPolicy(new QName(namespace, SPConstants.REQUIRE_KEY_IDENTIFIER_REFERENCE));
              }
              if (token.getApReqTokenType() != null) {
                  getPolicyAsserter().assertPolicy(new QName(namespace, token.getApReqTokenType().name()));
              }
          }
      }
  
      @Override
      public SecurityEventConstants.Event[] getSecurityEventType() {
          return new SecurityEventConstants.Event[]{
                  WSSecurityEventConstants.KERBEROS_TOKEN
          };
      }
  
      @Override
      public boolean assertToken(TokenSecurityEvent<? extends SecurityToken> tokenSecurityEvent,
                                 AbstractToken abstractToken) throws WSSPolicyException {
          if (!(tokenSecurityEvent instanceof KerberosTokenSecurityEvent)) {
              throw new WSSPolicyException("Expected a KerberosTokenSecurityEvent but got " + tokenSecurityEvent.getClass().getName());
          }
  
          KerberosToken kerberosToken = (KerberosToken) abstractToken;
          KerberosTokenSecurityEvent kerberosTokenSecurityEvent = (KerberosTokenSecurityEvent) tokenSecurityEvent;
          KerberosServiceSecurityToken kerberosServiceSecurityToken = kerberosTokenSecurityEvent.getSecurityToken();
  
          if (kerberosToken.getIssuerName() != null
              && !kerberosToken.getIssuerName().equals(kerberosTokenSecurityEvent.getIssuerName())) {
              setErrorMessage("IssuerName in Policy (" + kerberosToken.getIssuerName() + ") didn't match with the one in the IssuedToken ("
                  + kerberosTokenSecurityEvent.getIssuerName() + ")");
              getPolicyAsserter().unassertPolicy(getAssertion(), getErrorMessage());
              return false;
          }
  
          String namespace = getAssertion().getName().getNamespaceURI();
          if (kerberosToken.isRequireKeyIdentifierReference()) {
              KeyIdentifier kerberosKeyIdentifier = kerberosServiceSecurityToken.getKeyIdentifier();
              if (!WSSecurityTokenConstants.KEYIDENTIFIER_EMBEDDED_KEY_IDENTIFIER_REF.equals(kerberosKeyIdentifier)) {
                  setErrorMessage("Policy enforces KeyIdentifierReference but we got " + kerberosKeyIdentifier);
                  getPolicyAsserter().unassertPolicy(new QName(namespace, SPConstants.REQUIRE_KEY_IDENTIFIER_REFERENCE),
                                                   getErrorMessage());
                  return false;
              } else {
                  getPolicyAsserter().assertPolicy(new QName(namespace, SPConstants.REQUIRE_KEY_IDENTIFIER_REFERENCE));
              }
          }
          if (kerberosToken.getApReqTokenType() != null) {
              switch (kerberosToken.getApReqTokenType()) {    //NOPMD
                 case WssKerberosV5ApReqToken11:
                     if (!kerberosTokenSecurityEvent.isKerberosV5ApReqToken11()) {
                         setErrorMessage("Policy enforces " + kerberosToken.getApReqTokenType());
                         getPolicyAsserter().unassertPolicy(new QName(namespace, "WssKerberosV5ApReqToken11"),
                                                            getErrorMessage());
                         return false;
                     }
                     getPolicyAsserter().assertPolicy(new QName(namespace, "WssKerberosV5ApReqToken11"));
                     break;
                 case WssGssKerberosV5ApReqToken11:
                     if (!kerberosTokenSecurityEvent.isGssKerberosV5ApReqToken11()) {
                         setErrorMessage("Policy enforces " + kerberosToken.getApReqTokenType());
                         getPolicyAsserter().unassertPolicy(new QName(namespace, "WssGssKerberosV5ApReqToken11"),
                                                            getErrorMessage());
                         return false;
                     }
                     getPolicyAsserter().assertPolicy(new QName(namespace, "WssGssKerberosV5ApReqToken11"));
                     break;
             }
         }
         //always return true to prevent false alarm in case additional tokens with the same usage
         //appears in the message but do not fulfill the policy and are also not needed to fulfil the policy.
         getPolicyAsserter().assertPolicy(getAssertion());
         return true;
     }
 }