org.kuali.common.util.encrypt.provider.DefaultEncryptionContextProviderChain Maven / Gradle / Ivy

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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.provider;

import static com.google.common.base.Optional.absent;
import static com.google.common.collect.Lists.newArrayList;

import java.util.List;

import org.kuali.common.util.encrypt.EncryptionContext;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;

public final class DefaultEncryptionContextProviderChain implements EncryptionContextProvider {

	private static final String ENC_PASSWORD_KEY = "enc.password";
	private static final String ENC_STRENGTH_KEY = "enc.strength";

	// Need this key for backwards compatibility. "enc.password" contains a different password for some existing Maven processes
	private static final String ENC_MAVEN_ALTERNATE_PASSWORD_KEY = "enc.pwd";

	public DefaultEncryptionContextProviderChain() {
		List providers = newArrayList();
		providers.add(new SystemPropertiesEncryptionContextProvider(ENC_PASSWORD_KEY, ENC_STRENGTH_KEY));
		providers.add(new EnvironmentVariableEncryptionContextProvider(toEnvKey(ENC_PASSWORD_KEY), toEnvKey(ENC_STRENGTH_KEY)));
		providers.add(new FileEncryptionContextProvider());
		providers.add(new MavenEncryptionContextProvider(ENC_MAVEN_ALTERNATE_PASSWORD_KEY, ENC_STRENGTH_KEY));
		providers.add(new MavenEncryptionContextProvider(ENC_PASSWORD_KEY, ENC_STRENGTH_KEY));
		this.providers = ImmutableList.copyOf(providers);
	}

	public DefaultEncryptionContextProviderChain(EncryptionContextProvider... providers) {
		this(ImmutableList.copyOf(providers));
	}

	public DefaultEncryptionContextProviderChain(List providers) {
		this.providers = ImmutableList.copyOf(providers);
	}

	private final List providers;

	public List getProviders() {
		return providers;
	}

	@Override
	public Optional getEncryptionContext() {
		for (EncryptionContextProvider provider : providers) {
			Optional context = provider.getEncryptionContext();
			if (context.isPresent()) {
				return context;
			}
		}
		return absent();
	}

	protected static String toEnvKey(String key) {
		return key.replace('.', '_').toUpperCase();
	}

}