G2WMPREFRESHED/MPValidator.cs at main · Nanopaw-Studios/G2WMPREFRESHED · GitHub

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using GetToReWorked.Core;
using Isto.GTW;
using MelonLoader.Utils;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using UnityEngine;

namespace GetToReWorked.Core.Validation
{
    public static class MPValidator
    {
        public enum ValidationSeverity
        {
            Info,
            Warning,
            Error
        }
        public class ValidationIssue
        {
            public ValidationSeverity Severity;
            public string Message;

            public ValidationIssue(
                ValidationSeverity severity,
                string message)
            {
                Severity = severity;
                Message = message;
            }
        }

        public static List<ValidationIssue> Issues = new List<ValidationIssue>();

        public static bool HasIssues => Issues.Count > 0;

        public static void Validate()
        {
            Issues.Clear();

            if (!Core.SteamInitalized)
            {
                Issues.Add(new(ValidationSeverity.Error, "Steam failed to initialize."));
            }

            string userDataDir =
            Path.Combine(
                MelonEnvironment.UserDataDirectory,
                "GetToReWorked");

            if (!Directory.Exists(userDataDir))
            {
                Issues.Add(new(ValidationSeverity.Error, "GetToReWorked data folder missing."));
            }

            // skipped as i dont have access to the networkmanager hash atm
            ValidateAssetBundles();
            ValidateGameVersion();
        }

        public static void ValidateAssetBundles()
        {
            string bundleDir = Path.Combine(
                MelonEnvironment.UserDataDirectory,
                "GetToReWorked"
            );

            string[] requiredBundles =
            {
                "networkmanager.gtmpfile",
                "playertest.gtmpfile",
                "ui.gtmpfile"
            };

            foreach (string bundle in requiredBundles)
            {
                string bundlePath = Path.Combine(bundleDir, bundle);
                string hashPath = bundlePath + ".gtmpHash";

                if (!File.Exists(bundlePath))
                {
                    Issues.Add(new(ValidationSeverity.Error, $"Missing asset bundle: {bundle}"));
                    continue;
                }

                if (!File.Exists(hashPath))
                {
                    Issues.Add(new(ValidationSeverity.Error, $"Missing hash file for: {bundle}"));
                    continue;
                }

                try
                {
                    byte[] expectedHash = File.ReadAllBytes(hashPath);

                    using SHA256 sha256 = SHA256.Create();
                    byte[] actualHash = sha256.ComputeHash(File.ReadAllBytes(bundlePath));

                    if (!expectedHash.SequenceEqual(actualHash))
                    {
                        Issues.Add(new(ValidationSeverity.Error, $"Bundle hash mismatch: {bundle}"));
                    }
                }
                catch
                {
                    Issues.Add(new(ValidationSeverity.Error, $"Failed to read hash for: {bundle}"));
                }
            }
        }

        public static void ValidateGameVersion()
        {
            GTWGameState gameState =
                Resources.FindObjectsOfTypeAll<GTWGameState>()
                    .FirstOrDefault();

            if (gameState == null)
            {
                Issues.Add(new(ValidationSeverity.Error, "Could not determine game version."));
                return;
            }

            string currentVersion =
                gameState.version.ActiveVersion.FullVersionText;

            string supportedVersion = "1.1.2.0-";

            if (currentVersion != supportedVersion)
            {
                Issues.Add(new(ValidationSeverity.Error,
                    $"Game version {currentVersion} is not supported. Expected {supportedVersion}."
                ));
            }
        }
    }
}