Enable the possibility to disable a module

ChaosBot/Discord/PreConditions/CheckModuleEnabled.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using ChaosBot.Models;
+using ChaosBot.Repositories;
+using Discord.Commands;
+using Discord.WebSocket;
+using NLog;
+
+namespace ChaosBot.Discord.PreConditions
+{
+    public class CheckModuleEnabled : PreconditionAttribute
+    {
+        private static ILogger _logger = Program.Logger;
+        private readonly string _moduleName;
+        public CheckModuleEnabled(string moduleName) => _moduleName = moduleName;
+
+        public override Task<PreconditionResult> CheckPermissionsAsync(ICommandContext context, CommandInfo command, IServiceProvider services)
+        {
+            // Debug information
+            _logger.Trace($"CheckModuleEnabled.CheckPermissionsAsync|Checking module enabled for module: {_moduleName}");
+
+            if (context.Guild == null) return Task.FromResult(PreconditionResult.FromError("This must be run in a guild."));
+            
+            // Check if module enabled in database
+            bool isModuleEnabled = GetResult(context, _moduleName);
+
+            if (isModuleEnabled)
+                return Task.FromResult(PreconditionResult.FromSuccess());
+            
+            // Permission denied
+            return Task.FromResult(PreconditionResult.FromError($"You do not have access to this command."));
+        }
+
+        public static bool GetResult(ICommandContext context, string moduleName)
+        {
+            if (context.Guild == null) throw new Exception("This must be run in a guild");
+            
+            // Check if module enabled in database
+            return Convert.ToBoolean(ConfigurationRepository.GetValue<string>($"Module:{moduleName}:Enabled",
+                    context.Guild.Id, "true"));
+        }
+    }
+}