org.zalando.crypto.spring.boot.EncryptedYamlPropertySourceLoader.java Source code

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Here is the source code for org.zalando.crypto.spring.boot.EncryptedYamlPropertySourceLoader.java

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/**
 * Copyright (C) 2015 Zalando SE (http://tech.zalando.com)
 *
 * Licensed 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.zalando.crypto.spring.boot;

import java.io.IOException;
import java.util.Properties;

import org.springframework.beans.factory.config.YamlPropertiesFactoryBean;
import org.springframework.boot.env.PropertySourceLoader;
import org.springframework.boot.yaml.SpringProfileDocumentMatcher;
import org.springframework.core.Ordered;
import org.springframework.core.PriorityOrdered;
import org.springframework.core.env.PropertiesPropertySource;
import org.springframework.core.env.PropertySource;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.zalando.crypto.Decrypter;
import org.zalando.crypto.spring.EncryptableProperties;

/**
 * @author jbellmann
 */
public abstract class EncryptedYamlPropertySourceLoader implements PropertySourceLoader, PriorityOrdered {

    private Decrypter decrypter;

    public EncryptedYamlPropertySourceLoader() {
        loadAndSetDecryptor();
        // String catalinaBase = System.getProperty("catalina.base");
        // if (StringUtils.hasText(catalinaBase)) {
        //
        // // TODO, build path to private key
        // LOG.info("Using : {}", KeyczarDecrypter.class.getSimpleName());
        // this.decrypter = new KeyczarDecrypter(null, true);
        // } else {
        // LOG.info("Using : {}", NoOpCrypter.class.getSimpleName());
        // this.decrypter = new NoOpCrypter(true);
        // }
    }

    protected abstract void loadAndSetDecryptor();

    @Override
    public int getOrder() {
        return Ordered.HIGHEST_PRECEDENCE - 100;
    }

    @Override
    public String[] getFileExtensions() {
        return new String[] { "yml", "yaml" };
    }

    @Override
    public PropertySource<?> load(final String name, final Resource resource, final String profile)
            throws IOException {
        validateDecrypter();
        if (ClassUtils.isPresent("org.yaml.snakeyaml.Yaml", null)) {
            YamlPropertiesFactoryBean factory = new YamlPropertiesFactoryBean();
            if (profile == null) {
                factory.setMatchDefault(true);
                factory.setDocumentMatchers(new SpringProfileDocumentMatcher());
            } else {
                factory.setMatchDefault(false);
                factory.setDocumentMatchers(new SpringProfileDocumentMatcher(profile));
            }

            factory.setResources(new Resource[] { resource });

            Properties properties = factory.getObject();
            if (!properties.isEmpty()) {
                return new PropertiesPropertySource(name,
                        new EncryptableProperties(properties, decrypter, getPrefix()));
            }
        }

        return null;
    }

    protected void validateDecrypter() {
        Assert.notNull(decrypter, "'Decrypter' should not be null");
    }

    protected void setDecrypter(Decrypter decrypter) {
        Assert.notNull(decrypter, "'Decrypter' should not be null");
        this.decrypter = decrypter;
    }

    public String getPrefix() {
        return "crypto:";
    }

}