PropertiesLoader.java

/**
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * @author Gabriel Roldan, Boundless Spatial Inc, Copyright 2015
 */
package org.geowebcache.s3;

import static com.google.common.base.Preconditions.checkArgument;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Loads the configuration from a properties file {@code $HOME/.gwc_s3_tests.properties}, which must
 * exist and contain entries for {@code bucket}, {@code accessKey}, and {@code secretKey}.
 * <p>
 * If the file doesn't exist, the returned {@link #getProperties()} will be empty.
 * <p>
 * If the file does exist and doesn't contain one of the required keys, the constructor fails with
 * an {@link IllegalArgumentException}.
 */
public class PropertiesLoader {

    private static Log log = LogFactory.getLog(PropertiesLoader.class);

    private Properties properties = new Properties();

    public PropertiesLoader() {
        String home = System.getProperty("user.home");
        File configFile = new File(home, ".gwc_s3_tests.properties");
        log.info("Loading S3 tests config. File must have keys 'bucket', 'accessKey', and 'secretKey'");
        if (configFile.exists()) {
            try (InputStream in = new FileInputStream(configFile)) {
                properties.load(in);
                checkArgument(null != properties.getProperty("bucket"),
                        "bucket not provided in config file " + configFile.getAbsolutePath());
                checkArgument(null != properties.getProperty("accessKey"),
                        "accessKey not provided in config file " + configFile.getAbsolutePath());
                checkArgument(null != properties.getProperty("secretKey"),
                        "secretKey not provided in config file " + configFile.getAbsolutePath());
            } catch (IOException e) {
                log.fatal("Error loading S3 tests config: " + configFile.getAbsolutePath(), e);
            }
        } else {
            log.warn("S3 storage config file not found. GWC S3 tests will be ignored. "
                    + configFile.getAbsolutePath());
        }
    }

    public Properties getProperties() {
        return properties;
    }

}