ch.entwine.weblounge.aws.AmazonWebServices.java Source code

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Here is the source code for ch.entwine.weblounge.aws.AmazonWebServices.java

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/*
 *  Weblounge: Web Content Management System
 *  Copyright (c) 2011 The Weblounge Team
 *  http://weblounge.o2it.ch
 *
 *  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 2
 *  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 Lesser 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, write to the Free Software Foundation
 *  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

package ch.entwine.weblounge.aws;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.BasicAWSCredentials;

import org.apache.commons.lang.StringUtils;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.cm.Configuration;
import org.osgi.service.cm.ConfigurationAdmin;
import org.osgi.service.cm.ConfigurationException;
import org.osgi.service.cm.ManagedService;
import org.osgi.service.component.ComponentContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.Dictionary;

/**
 * Main class that is coordinating support around Amazon Web Services (AWS).
 */
public class AmazonWebServices implements ManagedService {

    /** Value of the service pid, used for service configuration lookup */
    public static final String SERVICE_PID = "ch.entwine.weblounge.aws";

    /** Identifier used to access amazon web services */
    public static final String OPT_ACCESS_KEY_ID = "aws.accessKeyId";

    /** Secret used to access amazon web services */
    public static final String OPT_ACCESS_KEY_SECRET = "aws.accessKeySecret";

    /** The logging implementation */
    private static final Logger logger = LoggerFactory.getLogger(AmazonWebServices.class);

    /** Amazon web services access key id */
    private String accessKeyId = null;

    /** Amazon web services access key secret */
    private String accessKeySecret = null;

    /** Amazon web services access credentials */
    private AWSCredentials accessCredentials = null;

    /** The Amazon S3 resource serializer */
    private AmazonResourceSerializer s3Serializer = null;

    /**
     * Activates the service implementation.
     * 
     * @param cc
     *          the component context
     * @throws ConfigurationException
     *           if service configuration fails
     */
    void activate(ComponentContext cc) throws ConfigurationException {
        BundleContext bundleCtx = cc.getBundleContext();
        ServiceReference ref = bundleCtx.getServiceReference(ConfigurationAdmin.class.getName());
        if (ref != null) {
            ConfigurationAdmin configurationAdmin = (ConfigurationAdmin) bundleCtx.getService(ref);
            Configuration config;
            try {
                config = configurationAdmin.getConfiguration(SERVICE_PID);
                if (config != null && config.getProperties() != null)
                    updated(config.getProperties());
                else
                    throw new IllegalStateException("Amazon web services need configuration");
            } catch (IOException e) {
                logger.error("Error trying to look up datasource configuration", e);
            }
        }
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.osgi.service.cm.ManagedService#updated(java.util.Dictionary)
     */
    @SuppressWarnings("rawtypes")
    public void updated(Dictionary properties) throws ConfigurationException {

        // Read the access key id
        accessKeyId = (String) properties.get(OPT_ACCESS_KEY_ID);
        if (StringUtils.isBlank(accessKeyId))
            throw new ConfigurationException(OPT_ACCESS_KEY_ID, "not set");
        logger.debug("Amazon access key id is '{}'", accessKeyId);

        // Read the access key secret
        accessKeySecret = (String) properties.get(OPT_ACCESS_KEY_SECRET);
        if (StringUtils.isBlank(accessKeySecret))
            throw new ConfigurationException(OPT_ACCESS_KEY_SECRET, "not set");
        logger.debug("Amazon access key secret is '{}'", accessKeySecret);

        // Create the credentials
        accessCredentials = new BasicAWSCredentials(accessKeyId, accessKeySecret);

        s3Serializer = new AmazonResourceSerializer(accessCredentials);
    }

}