From a0ec4db004806fe5796b3f8dd64cd89134ce8af0 Mon Sep 17 00:00:00 2001
From: Master Kwoth <srki0509@gmail.com>
Date: Fri, 19 Feb 2016 08:05:22 +0100
Subject: [PATCH] up to 1 command every 0-1.3 seconds per user

---
 .../Classes/Permissions/PermissionChecker.cs   | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/NadekoBot/Classes/Permissions/PermissionChecker.cs b/NadekoBot/Classes/Permissions/PermissionChecker.cs
index bba332e3..628b0c7b 100644
--- a/NadekoBot/Classes/Permissions/PermissionChecker.cs
+++ b/NadekoBot/Classes/Permissions/PermissionChecker.cs
@@ -6,18 +6,34 @@ using System.Text;
 using System.Threading.Tasks;
 using Discord;
 using Discord.Commands;
+using System.Collections.Concurrent;
 
 namespace NadekoBot.Classes.Permissions {
     class PermissionChecker : IPermissionChecker {
         public static readonly PermissionChecker _instance = new PermissionChecker();
         public static PermissionChecker Instance => _instance;
 
+        private ConcurrentDictionary<User, DateTime> timeBlackList { get; } = new ConcurrentDictionary<User, DateTime>();
+
         static PermissionChecker() { }
-        public PermissionChecker() { }
+        public PermissionChecker() {
+            Task.Run(async () => {
+                while (true) {
+                    //blacklist is cleared every 1.3 seconds. That is the most time anyone will be blocked for ever
+                    await Task.Delay(1300);
+                    timeBlackList.Clear();
+                }
+            });
+        }
 
         public bool CanRun(Command command, User user, Channel channel, out string error) {
             error = null;
 
+            if (timeBlackList.ContainsKey(user))
+                return false;
+
+            timeBlackList.TryAdd(user, DateTime.Now);
+
             if (channel.IsPrivate)
                 return true;