/**
    * 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.crypto.Crypto;
  import org.apache.wss4j.common.crypto.CryptoFactory;
  import org.apache.wss4j.common.crypto.CryptoType;
  import org.apache.wss4j.common.saml.SAMLCallback;
  import org.apache.wss4j.common.saml.bean.AdviceBean;
  import org.apache.wss4j.common.saml.bean.KeyInfoBean;
  import org.apache.wss4j.common.saml.bean.SubjectBean;
  import org.apache.wss4j.common.saml.bean.Version;
  import org.apache.wss4j.common.saml.builder.SAML2Constants;
  
  import javax.security.auth.callback.Callback;
  import javax.security.auth.callback.UnsupportedCallbackException;
  
  import java.io.IOException;
  
  /**
   * A Callback Handler implementation for a SAML 2 assertion. By default it creates an
   * authentication assertion using Sender Vouches.
   */
  public class SAML2CallbackHandler extends AbstractSAMLCallbackHandler {
  
      public SAML2CallbackHandler() throws Exception {
          if (certs == null) {
              Crypto crypto = CryptoFactory.getInstance("wss40.properties");
              CryptoType cryptoType = new CryptoType(CryptoType.TYPE.ALIAS);
              cryptoType.setAlias("wss40");
              certs = crypto.getX509Certificates(cryptoType);
          }
  
          subjectName = "uid=joe,ou=people,ou=saml-demo,o=example.com";
          subjectQualifier = "www.example.com";
          confirmationMethod = SAML2Constants.CONF_SENDER_VOUCHES;
      }
  
      public void handle(Callback[] callbacks)
          throws IOException, UnsupportedCallbackException {
          for (Callback callback : callbacks) {
              if (callback instanceof SAMLCallback) {
                  SAMLCallback samlCallback = (SAMLCallback) callback;
                  samlCallback.setSamlVersion(Version.SAML_20);
                  samlCallback.setIssuer(issuer);
                  samlCallback.setIssuerFormat(issuerFormat);
                  if (conditions != null) {
                      samlCallback.setConditions(conditions);
                  }
                  samlCallback.setIssuerCrypto(getIssuerCrypto());
                  samlCallback.setIssuerKeyName(getIssuerName());
                  samlCallback.setIssuerKeyPassword(getIssuerPassword());
  
                  if (getAssertionAdviceElement() != null) {
                      AdviceBean advice = new AdviceBean();
                      advice.getAssertions().add(getAssertionAdviceElement());
                      samlCallback.setAdvice(advice);
                  }
  
                  SubjectBean subjectBean =
                      new SubjectBean(
                          subjectName, subjectQualifier, confirmationMethod
                      );
                  if (subjectNameIDFormat != null) {
                      subjectBean.setSubjectNameIDFormat(subjectNameIDFormat);
                  }
                  if (subjectConfirmationNameID != null) {
                      subjectBean.setSubjectConfirmationNameID(subjectConfirmationNameID);
                  }
                  subjectBean.setSubjectConfirmationData(subjectConfirmationData);
                  if (SAML2Constants.CONF_HOLDER_KEY.equals(confirmationMethod)) {
                      try {
                          KeyInfoBean keyInfo = createKeyInfo();
                          subjectBean.setKeyInfo(keyInfo);
                      } catch (Exception ex) {
                          throw new IOException("Problem creating KeyInfo: " +  ex.getMessage());
                      }
                  }
                  samlCallback.setSubject(subjectBean);
                  createAndSetStatement(null, samlCallback);
                  samlCallback.setSignAssertion(signAssertion);
              } else {
                 throw new UnsupportedCallbackException(callback, "Unrecognized Callback");
             }
         }
     }
 
     public void setSubjectName(String newSubjectName) {
         this.subjectName = newSubjectName;
     }
 
 }