pl.otros.logview.VersionUtil.java Source code

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Here is the source code for pl.otros.logview.VersionUtil.java

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/*******************************************************************************
 * Copyright 2011 Krzysztof Otrebski
 *
 * 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 pl.otros.logview;

import org.apache.commons.io.IOUtils;
import pl.otros.logview.gui.ConfKeys;
import pl.otros.logview.gui.OtrosApplication;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.Proxy;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Enumeration;
import java.util.Properties;
import java.util.jar.Manifest;
import java.util.logging.Logger;

public class VersionUtil {

    private static final String CURRENT_VERSION_PAGE_URL = "http://otroslogviewer.appspot.com/services/currentVersion?";
    private static final Logger LOGGER = Logger.getLogger(VersionUtil.class.getName());
    public static final String IMPLEMENTATION_VERSION = "Implementation-Version";

    /**
     * Check latest released version.
     *
     * @param running  currently running version
     * @return Latest released version
     * @throws IOException
     */
    public static String getCurrentVersion(String running, Proxy proxy, OtrosApplication otrosApplication)
            throws IOException {
        StringBuilder sb = new StringBuilder();
        sb.append("runningVersion=").append(running);
        sb.append("&java.version=").append(URLEncoder.encode(System.getProperty("java.version"), "ISO-8859-1"));
        sb.append("&os.name=").append(URLEncoder.encode(System.getProperty("os.name"), "ISO-8859-1"));
        sb.append("&vm.vendor=").append(URLEncoder.encode(System.getProperty("java.vm.vendor"), "ISO-8859-1"));
        String uuid = URLEncoder.encode(otrosApplication.getConfiguration().getString(ConfKeys.UUID, ""),
                "ISO-8859-1");
        sb.append("&uuid=").append(uuid);
        URL url = new URL(CURRENT_VERSION_PAGE_URL + sb.toString());
        String page = IOUtils.toString(url.openConnection(proxy).getInputStream());
        ByteArrayInputStream bin = new ByteArrayInputStream(page.getBytes());
        Properties p = new Properties();
        p.load(bin);
        return p.getProperty("currentVersion", "?");

    }

    /**
     * Check version of running application. Version is read from /META-INF/MANIFEST.MF file
     *
     * @return currently running version
     * @throws IOException
     */
    public static String getRunningVersion() throws IOException {
        LOGGER.info("Checking running version");
        String result = "";
        Enumeration<URL> resources = VersionUtil.class.getClassLoader().getResources("META-INF/MANIFEST.MF");
        while (resources.hasMoreElements()) {
            URL url = resources.nextElement();
            if (url.toString().contains("OtrosLogViewer")) {
                InputStream inputStream = url.openStream();
                try {
                    Manifest manifest = new Manifest(inputStream);
                    result = manifest.getMainAttributes().getValue(IMPLEMENTATION_VERSION);
                    LOGGER.info("Running version is " + result);

                } finally {
                    IOUtils.closeQuietly(inputStream);
                }
            }
        }
        return result;
    }

}