feat: Added allow messages with a specified prefix to be sent

common/src/main/java/io/github/_4drian3d/authmevelocity/common/configuration/ProxyConfiguration.java

@@ -38,6 +38,11 @@ public SendOnLogin sendOnLogin() {
         return this.sendOnLogin;
     }
 
+    private Chat chat = new Chat();
+    public Chat chat() {
+        return this.chat;
+    }
+
     private Commands commands = new Commands();
     public Commands commands() {
         return this.commands;
@@ -105,6 +110,28 @@ public SendMode sendMode() {
         }
     }
 
+    @ConfigSerializable
+    public static class Chat {
+
+        @Comment("Enable chat filter")
+        private boolean enableAllowedChatPrefixes = false;
+        public boolean enableAllowedChatPrefixes() {
+            return this.enableAllowedChatPrefixes;
+        }
+
+        @Comment("Sets which messages players can send before they have logged in")
+        private List<String> allowedChatPrefixes = List.of(".l ", ".reg ", ".email ");
+        public List<String> allowedChatPrefixes() {
+            return this.allowedChatPrefixes;
+        }
+
+        @Comment("Sets the message to send to players who use messages that are not allowed. \\nLeave this option blank if you do not want the message to be sent.")
+        private String blockedChatMessage = "<red>You cannot send this message if you are not logged in yet";
+        public String blockedChatMessage() {
+            return this.blockedChatMessage;
+        }
+    }
+
     @ConfigSerializable
     public static class Commands {
         @Comment("Sets the commands that users who have not yet logged in can execute")

velocity/src/main/java/io/github/_4drian3d/authmevelocity/velocity/listener/input/ChatListener.java

@@ -22,8 +22,12 @@
 import com.velocitypowered.api.event.EventTask;
 import com.velocitypowered.api.event.PostOrder;
 import com.velocitypowered.api.event.player.PlayerChatEvent;
+import com.velocitypowered.api.proxy.Player;
 import io.github._4drian3d.authmevelocity.velocity.AuthMeVelocityPlugin;
 import io.github._4drian3d.authmevelocity.velocity.listener.Listener;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+
+import java.util.List;
 
 public final class ChatListener implements Listener<PlayerChatEvent> {
     @Inject
@@ -47,8 +51,26 @@ public EventTask executeAsync(final PlayerChatEvent event) {
 
             plugin.logDebug(() -> "PlayerChatEvent | Player " + event.getPlayer().getUsername() + " is not logged");
 
+            if (plugin.config().get().chat().enableAllowedChatPrefixes()
+                    && !plugin.config().get().chat().allowedChatPrefixes().isEmpty()
+                    && isMessageAllowed(event.getMessage(), plugin.config().get().chat().allowedChatPrefixes())) {
+                plugin.logDebug(() -> "PlayerChatEvent | Allowed message: " + event.getMessage());
+                continuation.resume();
+                return;
+            }
+
+            plugin.logDebug(() -> "PlayerChatEvent | Blocked message: " + event.getMessage());
             event.setResult(PlayerChatEvent.ChatResult.denied());
             continuation.resume();
         });
     }
+
+    private boolean isMessageAllowed(String message, List<String> allowedPrefixes) {
+        for (String prefix : allowedPrefixes) {
+            if (message.startsWith(prefix)) {
+                return true;
+            }
+        }
+        return false;
+    }
 }