Merge pull request #34 from nullinside-development-group/feature/DiscordScams

if you want viewer spam

Author: ProgrammingByPermutation

src/Nullinside.Api.TwitchBot/ChatRules/BestCheapViewers.cs

@@ -13,7 +13,10 @@ public class BestCheapViewers : AChatRule {
   /// <summary>
   ///  The strings that we expect to receive if this is a bot.
   /// </summary>
-  public readonly string[] EXPECTED = ["best viewers on", "cheap viewers on"];
+  public readonly string[] EXPECTED = [
+    "best viewers on", 
+    "cheap viewers on"
+  ];
 
   /// <inheritdoc />
   public override bool ShouldRun(TwitchUserConfig config) {

src/Nullinside.Api.TwitchBot/ChatRules/IfYouWantViewers.cs

@@ -0,0 +1,46 @@
+using Nullinside.Api.Common.Twitch;
+using Nullinside.Api.Model;
+using Nullinside.Api.Model.Ddl;
+
+using TwitchLib.Client.Models;
+
+namespace Nullinside.Api.TwitchBot.ChatRules;
+
+/// <summary>
+/// "if you want viewers, go to [link]" scam.
+/// </summary>
+public class IfYouWantViewers : AChatRule {
+  /// <summary>
+  ///  The strings that we expect to receive if this is a bot.
+  /// </summary>
+  public readonly string[] EXPECTED = [
+    "if you want more viewers for your stream, go to"
+  ];
+  
+  /// <inheritdoc />
+  public override bool ShouldRun(TwitchUserConfig config) {
+    return config is { Enabled: true, BanKnownBots: true };
+  }
+
+  /// <inheritdoc />
+  public override async Task<bool> Handle(string channelId, TwitchApiProxy botProxy, ChatMessage message,
+    NullinsideContext db, CancellationToken stoppingToken = new()) {
+    if (!message.IsFirstMessage) {
+      return true;
+    }
+    
+    // The number of spaces per message may chance, so normalize that and lowercase it for comparison.
+    string normalized = string.Join(' ', message.Message.Split(" ").Where(s => !string.IsNullOrWhiteSpace(s)))
+      .ToLowerInvariant();
+
+    foreach (var expected in EXPECTED) {
+      if (normalized.Contains(expected, StringComparison.InvariantCultureIgnoreCase)) {
+        await BanAndLog(channelId, botProxy, new[] { (message.UserId, message.Username) },
+          "[Bot] Spam (If You Want Viewers)", db, stoppingToken);
+        return false;
+      }
+    }
+
+    return true;
+  }
+}