DMDirc-Parser/src/com/dmdirc/parser/irc/IRCAuthenticator.java

/*
 * Copyright (c) 2006-2009 Chris Smith, Shane Mc Cormack, Gregory Holmes
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.dmdirc.parser.irc;

import java.net.Authenticator;
import java.net.PasswordAuthentication;

import java.util.Map;
import java.util.HashMap;

/**
 * Handles proxy authentication for the parser.
 * 
 * @author Shane Mc Cormack
 * @see IRCParser
 */
public class IRCAuthenticator extends Authenticator {
    /**
     * A version number for this class. It should be changed whenever the class
     * structure is changed (or anything else that would prevent serialized
     * objects being unserialized with the new class).
     */
    private static final long serialVersionUID = 1;

    /** Singleton instance of IRCAuthenticator. */
    private static IRCAuthenticator me = null;
    
    /** List of authentication replies. */
    private final Map<String,PasswordAuthentication> replies = new HashMap<String,PasswordAuthentication>();
    
    /**
     * Create a new IRCAuthenticator.
     *
     * This creates an IRCAuthenticator and registers it as the default
     * Authenticator.
     */
    private IRCAuthenticator() {
/*        try {
            final Field field = Authenticator.class.getDeclaredField("theAuthenticator");
            field.setAccessible(true);
            final Object authenticator = field.get(null);
            if (authenticator instanceof Authenticator) {
                oldAuthenticator = (Authenticator)authenticator;
            }
        } catch (NoSuchFieldException nsfe) {
        } catch (IllegalAccessException iae) {
        }*/
        Authenticator.setDefault(this);
    }
    
    /**
     * Get the instance of IRCAuthenticator.
     *
     * @return The IRCAuthenticator instance.
     */
    public static synchronized IRCAuthenticator getIRCAuthenticator() {
        if (me == null) {
            me = new IRCAuthenticator();
        }
        return me;
    }

    /**
     * Add a server to authenticate for.
     *
     * @param server ServerInfo object with proxy details.
     */
    public void addAuthentication(final ServerInfo server) {
        addAuthentication(server.getProxyHost(), server.getProxyPort(), server.getProxyUser(), server.getProxyPass());
    }

    /**
     * Add a host to authenticate for.
     *
     * @param host Hostname
     * @param port Port
     * @param username Username to return for authentication
     * @param password Password to return for authentication
     */
    public void addAuthentication(final String host, final int port, final String username, final String password) {
        if (username == null || password == null || username.isEmpty() || password.isEmpty()) {
            return;
        }
        final PasswordAuthentication pass = new PasswordAuthentication(username, password.toCharArray());
        final String fullhost = host.toLowerCase()+":"+port;
        
        if (replies.containsKey(fullhost)) {
            replies.remove(fullhost);
        }
        
        replies.put(fullhost, pass);
    }
    
    /** {@inheritDoc} */
    protected PasswordAuthentication getPasswordAuthentication() {
        /*
         * getRequestingHost: 85.234.138.2
         * getRequestingPort: 1080
         * getRequestingPrompt: SOCKS authentication
         * getRequestingProtocol: SOCKS5
         * getRequestingScheme: null
         * getRequestingSite: /85.234.138.2
         * getRequestingURL: null
         * getRequestorType: SERVER
         */

        final String fullhost = getRequestingHost().toLowerCase()+":"+getRequestingPort();
        return replies.get(fullhost);
    }
}