undead-universal-patch-il2cpp/Patches/Photon.cs

using HarmonyLib;
using Il2CppInterop.Runtime;
using System;
using System.Collections.Generic;
using System.Reflection;
using UnityEngine;

namespace undead_universal_patch_il2cpp.Patches
{
    [HarmonyPatch]
    public class PhotonPatchEvent
    {
        static readonly string TargetTypeName = "RecNet.Core";
        static readonly string TargetMethodName = "ConnectToRecNet";
        static readonly string Description = "Photon Patch event method";
        static readonly MethodInfo connectMethod = AccessTools.Method(AccessTools.TypeByName(TargetTypeName), TargetMethodName);
        
        static bool Prepare()
        {
            if (connectMethod == null)
            {
                Plugin.Log.LogWarning($"'{Description}' disabled. The type for this patch was not found.");
                return false;
            }

            Plugin.Log.LogInfo($"'{Description}' succeeded validation.");
            return true;
        }
        static MethodBase TargetMethod() => connectMethod;
        static void Prefix()
        {
            if (PhotonConfig.PatchPhotonIds.Value) Photon.Patch();
        }
    }

    public class Photon
    {
        public static void Patch()
        {
            /*
                Normally, I would be using reflection and AccessTools to create a new instance of ServerSettings and set the value of PhotonNetwork.PhotonServerSettings,
                but since it was difficult and confusing with IL2CPP, I ended up just using explicit references.. every targeted game build *should* have these types anyway.
                Now I'm wondering if the patch runs faster when using explicit references rather than reflection
            */

            PhotonNetwork.PhotonServerSettings.AppID = PhotonConfig.AppID.Value;
            PhotonNetwork.PhotonServerSettings.VoiceAppID = PhotonConfig.VoiceAppID.Value;
        }
    }
}