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Kuali Utilities

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/**
 * Copyright 2010-2014 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.encrypt;

import static java.lang.String.format;
import static org.kuali.common.util.encrypt.openssl.OpenSSL.buildOpenSSLEncryptor;
import static org.kuali.common.util.log.Loggers.newLogger;

import org.kuali.common.util.encrypt.provider.DefaultEncryptionContextProviderChain;
import org.kuali.common.util.encrypt.provider.EncryptionContextProvider;
import org.slf4j.Logger;

import com.google.common.base.Optional;

public final class Encryption {

	private static final Logger logger = newLogger();

	private static Encryptor encryptor;

	public static Encryptor buildEncryptor() {
		EncryptionContextProvider provider = new DefaultEncryptionContextProviderChain();
		Optional context = provider.getEncryptionContext();
		if (context.isPresent()) {
			return buildOpenSSLEncryptor(context.get());
		} else {
			logger.info(format("encryption disabled. no encryption password was located"));
			return NoOpEncryptor.INSTANCE;
		}
	}

	public synchronized static Encryptor getDefaultEncryptor() {
		if (encryptor == null) {
			encryptor = buildEncryptor();
		}
		return encryptor;
	}

}