Adding hosthub spam

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

@@ -0,0 +1,34 @@
+using Nullinside.Api.Common.Twitch;
+using Nullinside.Api.Model;
+using Nullinside.Api.Model.Ddl;
+
+using TwitchLib.Client.Models;
+
+namespace Nullinside.Api.TwitchBot.ChatRules;
+
+/// <summary>
+///   Handles "hosthub.vip" spam.
+/// </summary>
+public class HostHub : AChatRule {
+  /// <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()) {
+    // The number of spaces per message may change, so normalize that and lowercase it for comparison.
+    string normalized = string.Concat(message.Message.Split(" ").Where(s => !string.IsNullOrWhiteSpace(s)))
+      .ToLowerInvariant();
+
+    // Message will contain the site name with different domains.
+    if (message.IsFirstMessage && normalized.Contains("hosthub.")) {
+      await BanAndLog(channelId, botProxy, new[] { (message.UserId, message.Username) },
+        "[Bot] Spam (HostHub)", db, stoppingToken);
+      return false;
+    }
+
+    return true;
+  }
+}