ProxySettings.java

/*
 * Copyright (c) 2012 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available 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.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     HUMBOLDT EU Integrated Project #030962
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */

package eu.esdihumboldt.hale.ui.util.proxy;

import java.net.Authenticator;

import org.eclipse.equinox.security.storage.SecurePreferencesFactory;
import org.eclipse.equinox.security.storage.StorageException;
import org.eclipse.jface.preference.IPreferenceStore;

import de.fhg.igd.slf4jplus.ALogger;
import de.fhg.igd.slf4jplus.ALoggerFactory;
import eu.esdihumboldt.hale.ui.util.internal.UIUtilitiesPlugin;
import eu.esdihumboldt.hale.ui.util.proxy.preferences.PreferenceConstants;
import eu.esdihumboldt.util.http.ProxyUtil;

/**
 * Manages and applies the proxy settings
 * 
 * @author Simon Templer
 */
public class ProxySettings {

	private static ALogger log = ALoggerFactory.getLogger(ProxySettings.class);

	/**
	 * Install the proxy settings for them to be initialized when a proxy is
	 * used from {@link ProxyUtil}
	 */
	public static void install() {
		// try to setup now, if it fails, set it up to do it later
		try {
			applyCurrentSettings();
		} catch (Throwable e) {
			log.info("Proxy settings not applied, scheduling it for doing it later on demand", e); //$NON-NLS-1$
			ProxyUtil.addInitializer(new Runnable() {

				@Override
				public void run() {
					applyCurrentSettings();
				}
			});
		}
	}

	/**
	 * Apply the current proxy settings to the system
	 */
	public static void applyCurrentSettings() {
		// update proxy system properties
		IPreferenceStore prefs = UIUtilitiesPlugin.getDefault().getPreferenceStore();
		String host = prefs.getString(PreferenceConstants.CONNECTION_PROXY_HOST);
		int port = prefs.getInt(PreferenceConstants.CONNECTION_PROXY_PORT);
		String nonProxyHosts = prefs.getString(PreferenceConstants.CONNECTION_NON_PROXY_HOSTS);

		if (nonProxyHosts != null) {
			// support additional delimiters for nonProxyHosts: comma and
			// semicolon
			// the java mechanism needs the pipe as delimiter
			// see also ProxyPreferencePage.performOk
			nonProxyHosts = nonProxyHosts.replaceAll(",", "|"); //$NON-NLS-1$ //$NON-NLS-2$
			nonProxyHosts = nonProxyHosts.replaceAll(";", "|"); //$NON-NLS-1$ //$NON-NLS-2$
		}

		if (host == null || host.isEmpty()) {
			System.clearProperty("http.proxyHost"); //$NON-NLS-1$
			System.clearProperty("http.proxyPort"); //$NON-NLS-1$
			System.clearProperty("http.nonProxyHosts"); //$NON-NLS-1$

			System.clearProperty("http.proxyUser"); //$NON-NLS-1$
			System.clearProperty("http.proxyPassword"); //$NON-NLS-1$
		}
		else {
			System.setProperty("http.proxyHost", host); //$NON-NLS-1$
			System.setProperty("http.proxyPort", String.valueOf(port)); //$NON-NLS-1$
			if (nonProxyHosts == null || nonProxyHosts.isEmpty()) {
				System.clearProperty("http.nonProxyHosts"); //$NON-NLS-1$
			}
			else {
				System.setProperty("http.nonProxyHosts", nonProxyHosts); //$NON-NLS-1$
			}

			// only check user/password if host is set
			String proxyUser = prefs.getString(PreferenceConstants.CONNECTION_PROXY_USER);
			if (proxyUser != null && !proxyUser.isEmpty()) {
				System.setProperty("http.proxyUser", proxyUser); //$NON-NLS-1$

				try {
					String password = SecurePreferencesFactory.getDefault()
							.node(PreferenceConstants.SECURE_NODE_NAME)
							.get(PreferenceConstants.CONNECTION_PROXY_PASSWORD, null);

					if (password != null) {
						System.setProperty("http.proxyPassword", password); //$NON-NLS-1$

						Authenticator.setDefault(new HttpAuth(proxyUser, password));
					}
					else {
						System.clearProperty("http.proxyPassword"); //$NON-NLS-1$
					}
				} catch (StorageException e) {
					log.error("Error accessing secure preferences for proxy password"); //$NON-NLS-1$
				}
			}
			else {
				System.clearProperty("http.proxyUser"); //$NON-NLS-1$
				System.clearProperty("http.proxyPassword"); //$NON-NLS-1$
			}
		}
	}

}