Chat Filter System

Implements a filtering system for type chat. 
This incorporates a character replacement system that replaces what the server sees with other characters (For example, "à" would be replaced by "a"). What characters are replaced by what can be customized in `chatfilter.json`. Spaces and commas are hardcoded to be removed from the message that the server reads due to a lack of experience with .NET.
Includes a feature that replaces blocked messages with "This message has been removed." The message can be changed in `chatfilter.json`. It can be removed by making the string empty.
This system also logs messages into the console, and marks which messages are blocked.

src/CommandHandlers/ChatMessageHandler.cs

@@ -9,20 +9,57 @@ namespace sodoffmmo.CommandHandlers;
 class ChatMessageHandler : CommandHandler {
     public override Task Handle(Client client, NetworkObject receivedObject) {
         string message = receivedObject.Get<NetworkObject>("p").Get<string>("chm");
+        string messageFilter = message.ToLower();
         if (ManagementCommandProcessor.ProcessCommand(message, client))
             return Task.CompletedTask;
-        if (client.TempMuted) {
+        if (client.TempMuted)
+        {
             ClientMuted(client);
             return Task.CompletedTask;
-        }
-        if (!Configuration.ServerConfiguration.EnableChat && !client.Room.AllowChatOverride) {
+        }
+
+        messageFilter = messageFilter.Replace(",", "");//Hardcoded to remove commas from the message due to some issues
+        
+        foreach (var replaceable in ChatFilter.ChatFilterConfiguration.charsToRemove)//Rolls through the entire character replacement list
+        {
+            if (replaceable.Contains(","))//Checks if the replace string is valid (has a comma)
+            {
+                string char1 = replaceable.Remove(replaceable.LastIndexOf(','));//Gets the character to be replaced
+                string char2 = replaceable.Remove(0, replaceable.LastIndexOf(',') + 1);//Gets the replacement
+                messageFilter = messageFilter.Replace(char1, char2);
+            }
+        }
+        messageFilter = messageFilter.Replace(" ", "");
+
+        foreach (var banned in ChatFilter.ChatFilterConfiguration.FilteredWords)//Rolls through the entire denylist
+        {
+            if (messageFilter.Contains(banned))//Checks if your message contains a word from the denylist
+            {
+                Console.WriteLine("Banned message from " + client.PlayerData.Uid + " (" + client.PlayerData.DiplayName + "): \"" + messageFilter + "\", \"" + message + "\" in game: " + client.PlayerData.ZoneName);
+                ClientFilter(client);
+                if (!ChatFilter.ChatFilterConfiguration.blockedMessage.Equals(""))
+                    Chat(client, ChatFilter.ChatFilterConfiguration.blockedMessage);//This replaces the user's message with the message in the string. TODO: Add the string to the chatfilter json for the purpose of customization (How do I do that)
+                return Task.CompletedTask;
+            }
+        }
+
+        if (!Configuration.ServerConfiguration.EnableChat && !client.Room.AllowChatOverride)
+        {
             ChatDisabled(client);
-        } else {
+        }
+        else
+        {
+            Console.WriteLine("Message from " + client.PlayerData.Uid + " (" + client.PlayerData.DiplayName + "): \"" + messageFilter + "\", \"" + message + "\" in game: " + client.PlayerData.ZoneName);
             Chat(client, message);
         }
         return Task.CompletedTask;
     }
 
+    public void ClientFilter(Client client)
+    {
+        client.Send(Utils.BuildServerSideMessage("This message contains a word or phrase not allowed on this server.", "Server"));
+    }
+
     public void ChatDisabled(Client client) {
         client.Send(Utils.BuildServerSideMessage("Unfortunately, chat has been disabled by server administrators", "Server"));
     }

src/Core/ChatFilter.cs

@@ -0,0 +1,42 @@
+
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+using System.Text.Json;
+
+
+namespace sodoffmmo.Core;
+internal static class ChatFilter
+{
+
+    public static ChatFilterConfiguration ChatFilterConfiguration { get; private set; } = new ChatFilterConfiguration();
+
+
+    public static void Initialize()
+    {
+
+
+        using FileStream stream = File.OpenRead("src\\chatfilter.json");
+        ChatFilterConfiguration? ChatFilterConfiguration = JsonSerializer.Deserialize<ChatFilterConfiguration>(stream);
+        ChatFilter.ChatFilterConfiguration = ChatFilterConfiguration;
+        
+        if (ChatFilter.ChatFilterConfiguration is null)
+        {
+            Console.WriteLine("Filter list returned null");
+            return;
+        }
+
+    }
+}
+
+internal sealed class ChatFilterConfiguration
+{
+    public string[] FilteredWords { get; set; } = Array.Empty<string>();
+    public string[] charsToRemove { get; set; } = Array.Empty<string>();
+    public string blockedMessage { get; set; } = string.Empty;
+
+}

src/Program.cs

@@ -3,6 +3,7 @@ using sodoffmmo.Core;
 using System.Net;
 
 Configuration.Initialize();
+ChatFilter.Initialize();
 
 Server server;
 

src/chatfilter.json

@@ -0,0 +1,133 @@
+{
+  "FilteredWords": [
+    "pineapplepizzaisbad",
+    "ihatepineapplepizza",
+    "pineappleonpizzaisbad",
+    "ihatepineappleonpizza"
+  ],
+
+  "charsToRemove": [
+    "., ",
+    ";, ",
+    "', ",
+    "\", ",
+    "*, ",
+    "!, ",
+    "#, ",
+    "$, ",
+    "%, ",
+    "&, ",
+    "*, ",
+    "(, ",
+    "), ",
+    "^, ",
+    "{, ",
+    "}, ",
+    "[, ",
+    "], ",
+    "?, ",
+    "/, ",
+    "\\, ",
+    "-, ",
+    "_, ",
+    "¤, ",
+    "¦, ",
+    "§, ",
+    "¨, ",
+    "«, ",
+    "¬, ",
+    "¯, ",
+    "°, ",
+    "±, ",
+    "+, ",
+    "´, ",
+    "¶, ",
+    "·, ",
+    "¸, ",
+    "º, ",
+    "», ",
+    "¼, ",
+    "½, ",
+    "¾, ",
+    "¿, ",
+    "÷, ",
+    "¹,1",
+    "²,2",
+    "³,3",
+    "@,a",
+    "ª,a",
+    "¢,c",
+    "©,c",
+    "£,e",
+    "¡,i",
+    "®,r",
+    "$,s",
+    "µ,u",
+    "×,x",
+    "¥,y",
+    "Þ,th",
+    "þ,th",
+    "À,a",
+    "Á,a",
+    "Â,a",
+    "Ã,a",
+    "Ä,a",
+    "Å,a",
+    "Æ,ae",
+    "Ç,c",
+    "È,e",
+    "É,e",
+    "Ê,e",
+    "Ë,e",
+    "Ì,i",
+    "Í,i",
+    "Î,i",
+    "Ï,i",
+    "Đ,dz",
+    "Ñ,n",
+    "Ò,o",
+    "Ó,o",
+    "Ô,o",
+    "Õ,o",
+    "Ö,o",
+    "Ø,o",
+    "Ù,u",
+    "Ú,u",
+    "Û,u",
+    "Ü,u",
+    "Ý,y",
+    "ß, ",
+    "à,a",
+    "á,a",
+    "â,a",
+    "ã,a",
+    "ä,a",
+    "å,a",
+    "æ,ae",
+    "ç,c",
+    "è,e",
+    "é,e",
+    "ê,e",
+    "ë,e",
+    "ì,i",
+    "í,i",
+    "î,i",
+    "ï,i",
+    "ð,dz",
+    "ñ,n",
+    "ò,o",
+    "ó,o",
+    "ô,o",
+    "õ,o",
+    "ö,o",
+    "ø,o",
+    "ù,u",
+    "ú,u",
+    "û,u",
+    "ü,u",
+    "ý,y",
+    "night,nite"
+  ],
+
+  "blockedMessage" :  "This message has been removed."
+}