Move long plugin channel name check to a config option

common/src/main/java/us/myles/ViaVersion/AbstractViaConfig.java

@@ -54,6 +54,7 @@ public abstract class AbstractViaConfig extends Config implements ViaVersionConf
     private boolean fullBlockLightFix;
     private boolean healthNaNFix;
     private boolean instantRespawn;
+    private boolean ignoreLongChannelNames;
 
     protected AbstractViaConfig(File configFile) {
         super(configFile);
@@ -111,6 +112,7 @@ public abstract class AbstractViaConfig extends Config implements ViaVersionConf
         fullBlockLightFix = getBoolean("fix-non-full-blocklight", false);
         healthNaNFix = getBoolean("fix-1_14-health-nan", true);
         instantRespawn = getBoolean("use-1_15-instant-respawn", false);
+        ignoreLongChannelNames = getBoolean("ignore-long-1_16-channel-names", true);
     }
 
     @Override
@@ -363,4 +365,9 @@ public abstract class AbstractViaConfig extends Config implements ViaVersionConf
     public boolean is1_15InstantRespawn() {
         return instantRespawn;
     }
+
+    @Override
+    public boolean isIgnoreLong1_16ChannelMessages() {
+        return ignoreLongChannelNames;
+    }
 }

common/src/main/java/us/myles/ViaVersion/api/ViaVersionConfig.java

@@ -346,9 +346,16 @@ public interface ViaVersionConfig {
     boolean is1_14HealthNaNFix();
 
     /**
-     * Should 1.15 clients respawn instantly / without showing the death screen
+     * Should 1.15 clients respawn instantly / without showing the death screen.
      *
      * @return True if enabled
      */
     boolean is1_15InstantRespawn();
+
+    /**
+     * Ignores incoming plugin channel messages of 1.16 clients with channel names longer than 32 charatcers.
+     *
+     * @return True if enabled
+     */
+    boolean isIgnoreLong1_16ChannelMessages();
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_16to1_15_2/Protocol1_16To1_15_2.java

@@ -143,8 +143,7 @@ public class Protocol1_16To1_15_2 extends Protocol<ClientboundPackets1_15, Clien
             }
         });
 
-        // Spigot has the arbitrary limit of 32 in 1.15, upped to 64 in 1.16
-        if (isSpigot()) {
+        if (Via.getConfig().isIgnoreLong1_16ChannelMessages()) {
             registerIncoming(ServerboundPackets1_16.PLUGIN_MESSAGE, new PacketRemapper() {
                 @Override
                 public void registerMap() {
@@ -250,13 +249,4 @@ public class Protocol1_16To1_15_2 extends Protocol<ClientboundPackets1_15, Clien
             userConnection.put(new ClientWorld(userConnection));
         }
     }
-
-    private boolean isSpigot() {
-        try {
-            Class.forName("org.spigotmc.SpigotConfig");
-            return true;
-        } catch (ClassNotFoundException e) {
-            return false;
-        }
-    }
 }

common/src/main/resources/assets/viaversion/config.yml

@@ -147,6 +147,10 @@ flowerstem-when-block-above: false
 # Vines that are not connected to blocks will be mapped to air, else 1.13+ would still be able to climb up on them.
 vine-climb-fix: false
 #
+# Ignores incoming plugin channel messages of 1.16 clients with channel names longer than 32 charatcers.
+# CraftBukkit had this limit hardcoded until 1.16, so we have to assume any server/proxy might have this arbitrary check present.
+ignore-long-1_16-channel-names: true
+#
 #----------------------------------------------------------#
 #             1.9+ CLIENTS ON 1.8 SERVERS OPTIONS          #
 #----------------------------------------------------------#