/**
    * Copyright 2010-2012 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.common.util.property.processor;
  
  import java.util.List;
  import java.util.Properties;
  
  import org.jasypt.exceptions.EncryptionOperationNotPossibleException;
  import org.jasypt.util.text.TextEncryptor;
  import org.kuali.common.util.Mode;
  import org.kuali.common.util.PropertyUtils;
  import org.kuali.common.util.property.Constants;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class EndsWithDecryptProcessor extends DecryptProcessor {
  
  	private static final Logger logger = LoggerFactory.getLogger(EndsWithDecryptProcessor.class);
  
  	String suffix = Constants.DEFAULT_ENCRYPTED_SUFFIX;
  	boolean removeEncryptedProperties = true;
  	Mode propertyOverwriteMode = Constants.DEFAULT_PROPERTY_OVERWRITE_MODE;
  
  	public EndsWithDecryptProcessor() {
  		this(null);
  	}
  
  	public EndsWithDecryptProcessor(TextEncryptor encryptor) {
  		super(encryptor);
  	}
  
  	@Override
  	public void process(Properties properties) {
  		List<String> keys = PropertyUtils.getEndsWithKeys(properties, suffix);
  		logger.info("Decrypting {} property values", keys.size());
  		for (String key : keys) {
  			logger.debug("Decrypting [{}]", key);
  			String encryptedValue = properties.getProperty(key);
  			String decryptedValue = decrypt(key, encryptedValue, encryptor);
  			int endIndex = key.length() - suffix.length();
  			String newKey = key.substring(0, endIndex);
  			PropertyUtils.addOrOverrideProperty(properties, newKey, decryptedValue, propertyOverwriteMode);
  			if (removeEncryptedProperties) {
  				logger.debug("Removing {}", key);
  				properties.remove(key);
  			}
  		}
  	}
  
  	protected String decrypt(String key, String encryptedValue, TextEncryptor encryptor) {
  		try {
  			return encryptor.decrypt(encryptedValue);
  		} catch (EncryptionOperationNotPossibleException e) {
  			throw new IllegalStateException("Unexpected error decrypting [" + key + "]=[" + encryptedValue + "]");
  		}
  	}
  
  	public String getSuffix() {
  		return suffix;
  	}
  
  	public void setSuffix(String suffix) {
  		this.suffix = suffix;
  	}
  
  	public boolean isRemoveEncryptedProperties() {
  		return removeEncryptedProperties;
  	}
  
  	public void setRemoveEncryptedProperties(boolean removeEncryptedProperties) {
  		this.removeEncryptedProperties = removeEncryptedProperties;
  	}
  
  	public Mode getPropertyOverwriteMode() {
  		return propertyOverwriteMode;
  	}
  
  	public void setPropertyOverwriteMode(Mode propertyOverwriteMode) {
  		this.propertyOverwriteMode = propertyOverwriteMode;
  	}
  
  }