Added SendingCommand Event (#2793)

Exiled.Events/EventArgs/Player/SendingCommandEventArgs.cs

@@ -0,0 +1,63 @@
+// -----------------------------------------------------------------------
+// <copyright file="SendingCommandEventArgs.cs" company="Exiled Team">
+// Copyright (c) Exiled Team. All rights reserved.
+// Licensed under the CC BY-SA 3.0 license.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Exiled.Events.EventArgs.Player
+{
+    using CommandSystem;
+
+    using Exiled.API.Features;
+    using Exiled.Events.EventArgs.Interfaces;
+
+    using PluginAPI.Commands;
+
+    using RemoteAdmin;
+
+    /// <summary>
+    /// Contains all information before a player sends a propper RA command.
+    /// </summary>
+    public class SendingCommandEventArgs : IPlayerEvent, IDeniableEvent
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="SendingCommandEventArgs" /> class.
+        /// </summary>
+        /// <param name="player">
+        /// <inheritdoc cref="Player" />
+        /// </param>
+        /// <param name="command">
+        /// <inheritdoc cref="Command" />
+        /// </param>
+        /// <param name="query">
+        /// <inheritdoc cref="Query" />
+        /// </param>
+        public SendingCommandEventArgs(Player player, ICommand command, string query)
+        {
+            Command = command;
+            Player = player;
+            Query = query;
+        }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether the command can be executed.
+        /// </summary>
+        public bool IsAllowed { get; set; } = true;
+
+        /// <summary>
+        /// Gets the command that is being executed.
+        /// </summary>
+        public ICommand Command { get; }
+
+        /// <summary>
+        /// Gets the query of the command.
+        /// </summary>
+        public string Query { get; }
+
+        /// <summary>
+        /// Gets the player who's sending the command.
+        /// </summary>
+        public Player Player { get; }
+    }
+}

Exiled.Events/Handlers/Player.cs

@@ -518,6 +518,11 @@ public class Player
         /// </summary>
         public static Event<ChangingNicknameEventArgs> ChangingNickname { get; set; } = new();
 
+        /// <summary>
+        /// Invoked before a <see cref="API.Features.Player"/>'s sends propper RA command.
+        /// </summary>
+        public static Event<SendingCommandEventArgs> SendingCommand { get; set; } = new();
+
         /// <summary>
         /// Called before reserved slot is resolved for a <see cref="API.Features.Player"/>.
         /// </summary>
@@ -1117,6 +1122,12 @@ public static void OnItemRemoved(ReferenceHub referenceHub, InventorySystem.Item
         /// <param name="ev">The <see cref="ChangingNicknameEventArgs"/> instance.</param>
         public static void OnChangingNickname(ChangingNicknameEventArgs ev) => ChangingNickname.InvokeSafely(ev);
 
+        /// <summary>
+        /// Called before a <see cref="Player"/>'s sends propper RA command.
+        /// </summary>
+        /// <param name="ev">The <see cref="SendingCommandEventArgs"/> instance.</param>
+        public static void OnSendingCommand(SendingCommandEventArgs ev) => SendingCommand.InvokeSafely(ev);
+
         /// <summary>
         /// Called before pre-authenticating a <see cref="API.Features.Player"/>.
         /// </summary>

Exiled.Events/Patches/Events/Player/SendingCommand.cs

@@ -0,0 +1,85 @@
+// -----------------------------------------------------------------------
+// <copyright file="SendingCommand.cs" company="Exiled Team">
+// Copyright (c) Exiled Team. All rights reserved.
+// Licensed under the CC BY-SA 3.0 license.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Exiled.Events.Patches.Events.Player
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Reflection.Emit;
+
+    using API.Features;
+    using API.Features.Pools;
+
+    using CommandSystem;
+
+    using Exiled.Events.Attributes;
+    using Exiled.Events.EventArgs.Player;
+
+    using HarmonyLib;
+
+    using RemoteAdmin;
+
+    using static HarmonyLib.AccessTools;
+
+    /// <summary>
+    /// Patches <see cref="CommandProcessor.ProcessQuery(string, CommandSender)" />.
+    /// Adds the <see cref="Handlers.Player.SendingCommand" /> event.
+    /// </summary>
+    [EventPatch(typeof(Handlers.Player), nameof(Handlers.Player.SendingCommand))]
+    [HarmonyPatch(typeof(CommandProcessor), nameof(CommandProcessor.ProcessQuery))]
+    internal static class SendingCommand
+    {
+        private static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions, ILGenerator generator)
+        {
+            List<CodeInstruction> newInstructions = ListPool<CodeInstruction>.Pool.Get(instructions);
+
+            Label ret = generator.DefineLabel();
+
+            newInstructions[newInstructions.Count - 1].labels.Add(ret);
+            LocalBuilder ev = generator.DeclareLocal(typeof(SendingCommandEventArgs));
+            int offset = 2;
+            int index = newInstructions.FindIndex(instruction => instruction.Calls(Method(typeof(CommandHandler), nameof(CommandHandler.TryGetCommand)))) + offset;
+
+            newInstructions.InsertRange(
+                index,
+                new CodeInstruction[]
+                {
+                    // Sender
+                    new CodeInstruction(OpCodes.Ldarg_1),
+
+                    // Player.Get(CommandSender)
+                    new CodeInstruction(OpCodes.Call, Method(typeof(Player), nameof(Player.Get), new Type[] { typeof(CommandSender) })),
+
+                    // command
+                    new CodeInstruction(OpCodes.Ldloc_1),
+
+                    // query
+                    new CodeInstruction(OpCodes.Ldarg_0),
+
+                    // SendingCommandEventArgs ev = new SendingCommandEventArgs(Player, ICommand, Querry)
+                    new CodeInstruction(OpCodes.Newobj, GetDeclaredConstructors(typeof(SendingCommandEventArgs))[0]),
+                    new CodeInstruction(OpCodes.Dup),
+                    new CodeInstruction(OpCodes.Stloc_S, ev.LocalIndex),
+
+                    // Handlers.Player.OnSendingCommand(ev)
+                    new CodeInstruction(OpCodes.Call, Method(typeof(Handlers.Player), nameof(Handlers.Player.OnSendingCommand))),
+
+                    // isallowed == false
+                    new CodeInstruction(OpCodes.Ldloc_S, ev.LocalIndex),
+                    new CodeInstruction(OpCodes.Callvirt, PropertyGetter(typeof(SendingCommandEventArgs), nameof(SendingCommandEventArgs.IsAllowed))),
+
+                    // ret
+                    new CodeInstruction(OpCodes.Brfalse_S, ret),
+                });
+
+            for (int z = 0; z < newInstructions.Count; z++)
+                yield return newInstructions[z];
+
+            ListPool<CodeInstruction>.Pool.Return(newInstructions);
+        }
+    }
+}