/**
    * 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.dom.common;
  
  import org.apache.wss4j.common.ext.WSSecurityException;
  import org.apache.wss4j.common.saml.SamlAssertionWrapper;
  import org.apache.wss4j.dom.handler.RequestData;
  import org.apache.wss4j.dom.validate.Credential;
  import org.apache.wss4j.dom.validate.SamlAssertionValidator;
  
  public class CustomSamlAssertionValidator extends SamlAssertionValidator {
  
      @Override
      public Credential validate(Credential credential, RequestData data) throws WSSecurityException {
          Credential returnedCredential = super.validate(credential, data);
  
          //
          // Do some custom validation on the assertion
          //
          SamlAssertionWrapper samlAssertion = credential.getSamlAssertion();
          if (!"www.example.com".equals(samlAssertion.getIssuerString())) {
              throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, "invalidSAMLsecurity");
          }
          if (samlAssertion.getSaml1() != null) {
              // Get the SAML subject and validate it
              org.opensaml.saml.saml1.core.Assertion saml1Assertion = samlAssertion.getSaml1();
              org.opensaml.saml.saml1.core.Subject samlSubject = null;
              for (org.opensaml.saml.saml1.core.Statement stmt : saml1Assertion.getStatements()) {
                  if (stmt instanceof org.opensaml.saml.saml1.core.AttributeStatement) {
                      org.opensaml.saml.saml1.core.AttributeStatement attrStmt =
                          (org.opensaml.saml.saml1.core.AttributeStatement) stmt;
                      samlSubject = attrStmt.getSubject();
                      break;
                  } else if (stmt instanceof org.opensaml.saml.saml1.core.AuthenticationStatement) {
                      org.opensaml.saml.saml1.core.AuthenticationStatement authStmt =
                          (org.opensaml.saml.saml1.core.AuthenticationStatement) stmt;
                      samlSubject = authStmt.getSubject();
                      break;
                  } else {
                      org.opensaml.saml.saml1.core.AuthorizationDecisionStatement authzStmt =
                          (org.opensaml.saml.saml1.core.AuthorizationDecisionStatement)stmt;
                      samlSubject = authzStmt.getSubject();
                  }
              }
  
              if (samlSubject == null) {
                  throw new WSSecurityException(
                      WSSecurityException.ErrorCode.FAILURE, "invalidSAMLToken",
                      new Object[] {"for Signature (no Subject)"}
                  );
              }
              String nameIdentifier = samlSubject.getNameIdentifier().getValue();
              if (nameIdentifier == null || !nameIdentifier.contains("uid=joe")) {
                  throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, "invalidSAMLsecurity");
              }
          } else {
              org.opensaml.saml.saml2.core.Assertion saml2Assertion = samlAssertion.getSaml2();
              org.opensaml.saml.saml2.core.Subject subject = saml2Assertion.getSubject();
              String nameIdentifier = subject.getNameID().getValue();
              if (nameIdentifier == null || !nameIdentifier.contains("uid=joe")) {
                  throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, "invalidSAMLsecurity");
              }
          }
  
          return returnedCredential;
      }
  
  }