PluginMessage passthrough utility for bungeecord

Bungee/src/main/java/fr/pandacube/lib/bungee/util/PluginMessagePassthrough.java

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+package fr.pandacube.lib.bungee.util;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import net.md_5.bungee.api.ProxyServer;
+import net.md_5.bungee.api.connection.ProxiedPlayer;
+import net.md_5.bungee.api.connection.Server;
+import net.md_5.bungee.api.event.PluginMessageEvent;
+import net.md_5.bungee.api.plugin.Listener;
+import net.md_5.bungee.api.plugin.Plugin;
+import net.md_5.bungee.api.plugin.PluginManager;
+import net.md_5.bungee.event.EventHandler;
+
+public class PluginMessagePassthrough implements Listener {
+	private static final List<String> channels = Collections.synchronizedList(new ArrayList<>());
+	private static final PluginMessagePassthrough instance = new PluginMessagePassthrough();
+	
+	public static void init(Plugin plugin) {
+		PluginManager pm = ProxyServer.getInstance().getPluginManager();
+		pm.unregisterListener(instance);
+		pm.registerListener(plugin, instance);
+	}
+	
+	public static void clear() {
+		synchronized (channels) {
+			new ArrayList<>(channels).forEach(c -> unregister(c));
+		}
+	}
+	
+	public static void registerAll(String... channels) {
+		for (String channel : channels)
+			register(channel);
+	}
+	
+	public static void unregisterAll(String... channels) {
+		for (String channel : channels)
+			unregister(channel);
+	}
+	
+	public static void register(String channel) {
+		synchronized (channels) {
+			if (channels.contains(channel))
+				return;
+			ProxyServer.getInstance().registerChannel(channel);
+			channels.add(channel);
+		}
+	}
+	
+	public static void unregister(String channel) {
+		synchronized (channels) {
+			if (!channels.contains(channel))
+				return;
+			ProxyServer.getInstance().unregisterChannel(channel);
+			channels.remove(channel);
+		}
+	}
+	
+	
+	@EventHandler
+	public void onPluginMessage(PluginMessageEvent event) {
+		String channel = event.getTag();
+		if (!channels.contains(channel))
+			return;
+		if (event.getReceiver() instanceof ProxiedPlayer) {
+			((ProxiedPlayer)event.getReceiver()).sendData(channel, event.getData());
+		} else if (event.getReceiver() instanceof Server) {
+			((Server)event.getReceiver()).sendData(channel, event.getData());
+		}
+	}
+}