/*
    * 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.syncope.core.provisioning.java.propagation;
  
  import java.util.Optional;
  import java.util.Set;
  import org.apache.syncope.common.lib.types.AnyTypeKind;
  import org.apache.syncope.common.lib.types.CipherAlgorithm;
  import org.apache.syncope.common.lib.types.ConnConfProperty;
  import org.apache.syncope.core.persistence.api.dao.UserDAO;
  import org.apache.syncope.core.persistence.api.entity.ConnInstance;
  import org.apache.syncope.core.persistence.api.entity.task.PropagationData;
  import org.apache.syncope.core.persistence.api.entity.user.User;
  import org.apache.syncope.core.provisioning.api.propagation.PropagationActions;
  import org.apache.syncope.core.provisioning.api.propagation.PropagationManager;
  import org.apache.syncope.core.provisioning.api.propagation.PropagationTaskInfo;
  import org.apache.syncope.core.spring.implementation.InstanceScope;
  import org.apache.syncope.core.spring.implementation.SyncopeImplementation;
  import org.identityconnectors.common.security.GuardedString;
  import org.identityconnectors.framework.common.objects.Attribute;
  import org.identityconnectors.framework.common.objects.AttributeBuilder;
  import org.identityconnectors.framework.common.objects.AttributeUtil;
  import org.identityconnectors.framework.common.objects.OperationalAttributes;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.transaction.annotation.Transactional;
  
  /**
   * Propagate a non-cleartext password out to a resource, if the PropagationManager has not already
   * added a password. The CipherAlgorithm associated with the password must match the password
   * cipher algorithm property of the DB Connector.
   */
  @SyncopeImplementation(scope = InstanceScope.PER_CONTEXT)
  public class DBPasswordPropagationActions implements PropagationActions {
  
      protected static final String CLEARTEXT = "CLEARTEXT";
  
      @Autowired
      protected UserDAO userDAO;
  
      protected String getCipherAlgorithm(final ConnInstance connInstance) {
          Optional<ConnConfProperty> cipherAlgorithm = connInstance.getConf().stream().
                  filter(property -> "cipherAlgorithm".equals(property.getSchema().getName())
                  && property.getValues() != null && !property.getValues().isEmpty()).findFirst();
  
          return cipherAlgorithm.map(a -> (String) a.getValues().get(0)).orElse(CLEARTEXT);
      }
  
      protected boolean cipherAlgorithmMatches(final String connectorAlgorithm, final CipherAlgorithm userAlgorithm) {
          if (userAlgorithm == null) {
              return false;
          }
  
          if (connectorAlgorithm.equals(userAlgorithm.name())) {
              return true;
          }
  
          // Special check for "SHA" (user sync'd from LDAP)
          return "SHA1".equals(connectorAlgorithm) && "SHA".equals(userAlgorithm.name());
      }
  
      @Transactional(readOnly = true)
      @Override
      public void before(final PropagationTaskInfo taskInfo) {
          if (AnyTypeKind.USER == taskInfo.getAnyTypeKind()) {
              User user = userDAO.find(taskInfo.getEntityKey());
  
              PropagationData data = taskInfo.getPropagationData();
              if (user != null && user.getPassword() != null && data.getAttributes() != null) {
                  Set<Attribute> attrs = data.getAttributes();
  
                  Attribute missing = AttributeUtil.find(PropagationManager.MANDATORY_MISSING_ATTR_NAME, attrs);
  
                  ConnInstance connInstance = taskInfo.getResource().getConnector();
                  if (missing != null && missing.getValue() != null && missing.getValue().size() == 1
                          && missing.getValue().get(0).equals(OperationalAttributes.PASSWORD_NAME)
                          && cipherAlgorithmMatches(getCipherAlgorithm(connInstance), user.getCipherAlgorithm())) {
  
                      Attribute passwordAttribute = AttributeBuilder.buildPassword(
                              new GuardedString(user.getPassword().toCharArray()));
  
                      attrs.add(passwordAttribute);
                      attrs.remove(missing);
  
                     Attribute hashedPasswordAttribute = AttributeBuilder.build(
                             AttributeUtil.createSpecialName("HASHED_PASSWORD"), Boolean.TRUE);
                     attrs.add(hashedPasswordAttribute);
                 }
             }
         }
     }
 }