org.jasig.portlet.calendar.spring.StringEncryptorFactoryBean.java Source code

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Here is the source code for org.jasig.portlet.calendar.spring.StringEncryptorFactoryBean.java

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/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * 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 the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.jasig.portlet.calendar.spring;

import org.jasypt.encryption.StringEncryptor;
import org.jasypt.encryption.pbe.StandardPBEStringEncryptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.FactoryBean;

public class StringEncryptorFactoryBean implements FactoryBean<StringEncryptor> {

    public static final String JAYSYPT_ENCRYPTION_KEY_VARIABLE = "UP_JASYPT_KEY";

    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Override
    public StringEncryptor getObject() throws Exception {

        final StandardPBEStringEncryptor rslt = new StandardPBEStringEncryptor();

        /*
         * If properties file encryption is used in this deployment, the
         * encryption key will be made available to the application as an
         * environment variable called UP_JASYPT_KEY.
         */
        final String encryptionKey = System.getenv(JAYSYPT_ENCRYPTION_KEY_VARIABLE);

        if (encryptionKey != null) {

            logger.info("Jasypt support for encrypted property values ENABLED");

            rslt.setPassword(encryptionKey);

        } else {

            logger.info(
                    "Jasypt support for encrypted property values DISABLED;  "
                            + "specify environment variable {} to use this feature",
                    JAYSYPT_ENCRYPTION_KEY_VARIABLE);

            /*
             * According to the API docs, not setting a password (on the StandardPBEStringEncryptor)
             * will result in an EncryptionInitializationException being thrown during initialization,
             * which will occur on the first call to decrypt(...);
             */

        }

        return rslt;
    }

    @Override
    public Class<StringEncryptor> getObjectType() {
        return StringEncryptor.class;
    }

    @Override
    public boolean isSingleton() {
        return false;
    }
}