Add command line option to bind to a local socket. Also, add command line parsing.

src/main/java/moe/nekojimi/chords/CommandOptions.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2022 jimj316
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package moe.nekojimi.chords;
+
+import com.beust.jcommander.Parameter;
+
+/**
+ *
+ * @author jimj316
+ */
+public class CommandOptions
+{
+
+    @Parameter(description = "The API token for Discord.", required = true)
+    private String token;
+
+    @Parameter(names = "-local-addr", description = "The local address to bind to.")
+    private String localAddress;
+
+    public String getToken()
+    {
+        return token;
+    }
+
+    public String getLocalAddress()
+    {
+        return localAddress;
+    }
+
+}

src/main/java/moe/nekojimi/chords/LocalBindSocketFactory.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2022 jimj316
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package moe.nekojimi.chords;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.UnknownHostException;
+import javax.net.SocketFactory;
+
+/**
+ *
+ * @author jimj316
+ */
+public class LocalBindSocketFactory extends SocketFactory
+{
+
+    private InetAddress localAddress;
+
+    public InetAddress getLocalAddress()
+    {
+        return localAddress;
+    }
+
+    public void setLocalAddress(InetAddress localAddress)
+    {
+        this.localAddress = localAddress;
+    }
+
+    @Override
+    public Socket createSocket(String remoteAddr, int remotePort) throws IOException, UnknownHostException
+    {
+        return createSocket(remoteAddr, remotePort, localAddress, findFreePort(localAddress));
+    }
+
+    @Override
+    public Socket createSocket(String remoteAddr, int remotePort, InetAddress x, int localPort) throws IOException, UnknownHostException
+    {
+        return createSocket(InetAddress.getByName(remoteAddr), remotePort, localAddress, localPort);
+    }
+
+    @Override
+    public Socket createSocket(InetAddress remoteAddr, int remotePort) throws IOException
+    {
+        return createSocket(remoteAddr, remotePort, localAddress, findFreePort(localAddress));
+    }
+
+    @Override
+    public Socket createSocket(InetAddress remoteAddr, int remotePort, InetAddress x, int localPort) throws IOException
+    {
+        return new Socket(remoteAddr, remotePort, localAddress, localPort);
+    }
+
+    private static int findFreePort(InetAddress localAddr)
+    {
+        int port = 0;
+        // For ServerSocket port number 0 means that the port number is automatically allocated.
+        try (ServerSocket socket = new ServerSocket(0, 0, localAddr))
+        {
+            // Disable timeout and reuse address after closing the socket.
+            socket.setReuseAddress(true);
+            port = socket.getLocalPort();
+        } catch (IOException ignored)
+        {
+        }
+        if (port > 0)
+        {
+            return port;
+        }
+        throw new RuntimeException("Could not find a free port");
+    }
+
+}

src/main/java/moe/nekojimi/chords/Main.java

@@ -7,11 +7,13 @@ package moe.nekojimi.chords;
 
 import com.amihaiemil.eoyaml.Yaml;
 import com.amihaiemil.eoyaml.YamlMapping;
+import com.beust.jcommander.JCommander;
+import com.beust.jcommander.Parameter;
+import com.neovisionaries.ws.client.WebSocketFactory;
 import java.io.File;
 import java.io.FilenameFilter;
 import java.io.IOException;
-import java.net.MalformedURLException;
-import java.net.URL;
+import java.net.*;
 import java.nio.file.Files;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
@@ -20,6 +22,8 @@ import java.util.function.BiConsumer;
 import java.util.function.Consumer;
 import java.util.logging.Level;
 import java.util.logging.Logger;
+import javax.net.SocketFactory;
+import javax.net.ssl.SSLSocketFactory;
 import javax.security.auth.login.LoginException;
 import moe.nekojimi.chords.commands.*;
 import moe.nekojimi.musicsearcher.providers.MetaSearcher;
@@ -42,6 +46,8 @@ import net.dv8tion.jda.api.utils.cache.CacheFlag;
 public final class Main extends ListenerAdapter
 {
 
+    private static final CommandOptions options = new CommandOptions();
+
     private final File dataDirectory;
     private final File playlistsDirectory;
 
@@ -66,6 +72,13 @@ public final class Main extends ListenerAdapter
      */
     public static void main(String[] args) throws LoginException, IOException
     {
+
+        JCommander commander = JCommander.newBuilder()
+                .args(args)
+                .acceptUnknownOptions(true)
+                .addObject(options)
+                .build();
+
         // We only need 2 gateway intents enabled for this example:
         EnumSet<GatewayIntent> intents = EnumSet.of(
                 // We need messages in guilds to accept commands from users
@@ -91,49 +104,21 @@ public final class Main extends ListenerAdapter
         builder.addEventListeners(listener);
         builder.setAutoReconnect(true);
 
+        if (options.getLocalAddress() != null)
+        {
+            final WebSocketFactory webSocketFactory = new WebSocketFactory();
+            final LocalBindSocketFactory localBindSocketFactory = new LocalBindSocketFactory();
+            localBindSocketFactory.setLocalAddress(InetAddress.getByName(options.getLocalAddress()));
+            webSocketFactory.setSocketFactory(localBindSocketFactory);
+            builder.setWebsocketFactory(webSocketFactory);
+        }
+
         JDA jda = builder.build();
         listener.setJda(jda);
     }
-    private final Consumer<Song> nowPlayingConsumer = (Song song) ->
-    {
-        if (song != null)
-            jda.getPresence().setActivity(Activity.of(Activity.ActivityType.LISTENING, song.toString()));
-        else
-            jda.getPresence().setActivity(null);
-    };
+    private final Consumer<Song> nowPlayingConsumer = new NowPlayingConsumer();
 
-    private final BiConsumer<SongRequest, Exception> downloaderMessageHandler = (SongRequest request, Exception ex) ->
-    {
-        Song song = request.getSong();
-//            TextChannel channel = jda.getTextChannelById(song.getRequestedIn());
-//            String bracketNo = "[" + song.getNumber() + "] ";
-        if (ex == null)
-            if (song.getLocation() != null)
-            {
-                request.getInvocation().respond("Finished downloading " + song + ", added to queue!");
-                log("DOWN", "Downloaded " + song);
-            } else
-            {
-                Format format = song.getBestFormat();
-                String formatDetails = "";
-                if (format != null)
-                {
-                    final int bitrate = format.getSampleRate() / 1000;
-                    final long size = format.getSize();
-                    String sizeFmt = (size <= 0 ? "?.??" : String.format("%.2f", size / (1024.0 * 1024.0))) + "MiB";
-                    String bitFmt = (bitrate <= 0 ? "??" : bitrate) + "k";
-                    formatDetails = " (" + bitFmt + ", " + sizeFmt + ")";
-                }
-                request.getInvocation().respond("Now downloading " + song + formatDetails + " ...");
-                log("DOWN", "Downloading " + song + "...");
-            }
-        else
-        {
-            request.getInvocation().respond("Failed to download " + song + "! Reason: " + ex.getMessage());
-            log("DOWN", "Failed to download " + song + "! Reason: " + ex.getMessage());
-        }
-
-    };
+    private final BiConsumer<SongRequest, Exception> downloaderMessageHandler = new DownloaderMessageHandler();
 
     public Main() throws IOException
     {
@@ -171,7 +156,6 @@ public final class Main extends ListenerAdapter
         log("INFO", "Started OK!");
     }
 
-
     private void addCommand(Command command)
     {
         commands.put(command.getKeyword(), command);
@@ -407,6 +391,7 @@ public final class Main extends ListenerAdapter
     {
         return currentVoiceChannel;
     }
+
     public QueueManager getQueueManager()
     {
         return queueManager;
@@ -417,5 +402,62 @@ public final class Main extends ListenerAdapter
         return trackNumber;
     }
 
+    private class DownloaderMessageHandler implements BiConsumer<SongRequest, Exception>
+    {
+
+        public DownloaderMessageHandler()
+        {
+        }
+
+        @Override
+        public void accept(SongRequest request, Exception ex)
+        {
+            Song song = request.getSong();
+//            TextChannel channel = jda.getTextChannelById(song.getRequestedIn());
+//            String bracketNo = "[" + song.getNumber() + "] ";
+            if (ex == null)
+                if (song.getLocation() != null)
+                {
+                    request.getInvocation().respond("Finished downloading " + song + ", added to queue!");
+                    log("DOWN", "Downloaded " + song);
+                } else
+                {
+                    Format format = song.getBestFormat();
+                    String formatDetails = "";
+                    if (format != null)
+                    {
+                        final int bitrate = format.getSampleRate() / 1000;
+                        final long size = format.getSize();
+                        String sizeFmt = (size <= 0 ? "?.??" : String.format("%.2f", size / (1024.0 * 1024.0))) + "MiB";
+                        String bitFmt = (bitrate <= 0 ? "??" : bitrate) + "k";
+                        formatDetails = " (" + bitFmt + ", " + sizeFmt + ")";
+                    }
+                    request.getInvocation().respond("Now downloading " + song + formatDetails + " ...");
+                    log("DOWN", "Downloading " + song + "...");
+                }
+            else
+            {
+                request.getInvocation().respond("Failed to download " + song + "! Reason: " + ex.getMessage());
+                log("DOWN", "Failed to download " + song + "! Reason: " + ex.getMessage());
+            }
+        }
+    }
+
+    private class NowPlayingConsumer implements Consumer<Song>
+    {
+
+        public NowPlayingConsumer()
+        {
+        }
+
+        @Override
+        public void accept(Song song)
+        {
+            if (song != null)
+                jda.getPresence().setActivity(Activity.of(Activity.ActivityType.LISTENING, song.toString()));
+            else
+                jda.getPresence().setActivity(null);
+        }
+    }
 
 }