Bot cleanup

Language file updates

src/ServerManager.Discord/Attributes/RequireRoleAttribute.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using Discord.Commands;
+using Discord.WebSocket;
+
+namespace ServerManagerTool.DiscordBot.Attributes
+{
+    public class RequireRoleAttribute : PreconditionAttribute
+    {
+        private readonly string _name;
+
+        public RequireRoleAttribute(string name)
+        {
+            _name = name;
+        }
+
+        public override Task<PreconditionResult> CheckPermissionsAsync(ICommandContext context, CommandInfo command, IServiceProvider services)
+        {
+            // Check if this user is a Guild User, which is the only context where roles exist
+            if (context.User is SocketGuildUser guildUser)
+            {
+                // If this command was executed by a user with the appropriate role, return a success
+                if (guildUser.Roles.Any(r => r.Name == _name))
+                {
+                    // Since no async work is done, the result has to be wrapped with `Task.FromResult` to avoid compiler errors
+                    return Task.FromResult(PreconditionResult.FromSuccess());
+                }
+                else
+                {
+                    // Since it wasn't, fail
+                    return Task.FromResult(PreconditionResult.FromError($"You must have a role named '{_name}' to run this command."));
+                }
+            }
+            else
+            {
+                return Task.FromResult(PreconditionResult.FromError("You must be in a guild to run this command."));
+            }
+        }
+    }
+}