KF3_TranslationUpdater/UpdateHandler.cs

using System.Collections;
using System.Collections.Generic;
using System.IO.Compression;
using System.IO;
using UnityEngine;
using UnityEngine.Networking;

public class UpdateHandler : MonoBehaviour
{
    private string _message = "";
    private string _serverVersion = "";
    private float _messageTime = 0;
    private bool _updating = false;
    private bool _updateSuccess = false;
    private const string translationVersion = "lastVersion";
    private const string repositoryUrl = "https://git.japari.cafe/api/v1/repos/Vorked/VorkedTranslationPack";

    public IEnumerator Start()
    {
        string currentVersion = PlayerPrefs.GetString(translationVersion, "0");
        string newVersion = currentVersion;

        yield return DownloadText(repositoryUrl,
            (json) =>
            {
                var newData = JsonUtility.FromJson<JsonSmall>(json);
                newVersion = newData.updated_at;
            }
         );

        Debug.Log("local version: " + currentVersion);
        Debug.Log("server version: " + newVersion);

        if (newVersion != currentVersion)
        {
            _serverVersion = newVersion;
        }
        else
        {
            Destroy(this.gameObject);
        }
    }

    public void OnGUI()
    {
        if (_updating || _messageTime > 0)
        {
            var style = GUI.skin.GetStyle("Label");
            style.normal.textColor = Color.black;
            style.normal.background = Texture2D.whiteTexture;
            style.alignment = TextAnchor.MiddleCenter;
            GUI.Label(new Rect(Screen.width / 2 - 10, Screen.height / 2 - 25, 200, 100), _message, style);
        }
        else
        {
            var style = GUI.skin.GetStyle("Button");
            style.alignment = TextAnchor.UpperCenter;
            if (GUI.Button(new Rect(Screen.width / 2 - 100, 0, 200, 50), "Translation Update Available", style))
            {
                StartCoroutine(UpdateTranslation());
            }
        }
    }

    private void Update()
    {
        if (_messageTime > 0)
        {
            _messageTime -= Time.deltaTime;
        }
        else if (_updateSuccess)
        {
            Destroy(this.gameObject);
        }
    }

    public IEnumerator UpdateTranslation()
    {
        _updating = true;

        byte[] bytes = null;
        yield return DownloadBytes(repositoryUrl + "/archive/master.zip",
            (newBytes) =>
            {
                bytes = newBytes;
            },
            (progress) =>
            {
                SetMessage($"Downloading {progress * 100}%");
            }
         );

        if (bytes.Length <= 0)
        {
            SetMessage("Error. Download failed");
            _updateSuccess = false;
            yield break;
        }

        using (var compressedFileStream = new MemoryStream(bytes))
        {
            using (var zipArchive = new ZipArchive(compressedFileStream, ZipArchiveMode.Read, false))
            {
                foreach (var file in zipArchive.Entries)
                {
                    if (file.Name != "")
                    {
                        //remove repo name from file path
                        var outFilePath = file.FullName.Split(new[] { '/' }, 2)[1];
                        Directory.CreateDirectory(Path.GetDirectoryName(outFilePath));
                        file.ExtractToFile(outFilePath, true);
                    }
                }
            }
        }

        PlayerPrefs.SetString(translationVersion, _serverVersion);
        SetMessage("Update completed! Please restart the game to apply it.", 5);
        _updateSuccess = true;
        _updating = false;
    }

    private void SetMessage(string message, float time = 2)
    {
        _message = message;
        _messageTime = time;
    }

    public static IEnumerator DownloadBytes(string url, System.Action<byte[]> callback, System.Action<float> onProgressChanged = null)
    {
        UnityWebRequest www = UnityWebRequest.Get(url);

        var request = www.SendWebRequest();
        while (!request.isDone)
        {
            onProgressChanged?.Invoke(request.progress);
            yield return 0;
        }

        if (www.result != UnityWebRequest.Result.Success)
        {
            Debug.Log(url);
            Debug.Log(www.error);
            callback(null);
        }
        else
        {
            callback(www.downloadHandler.data);
        }
    }

    public static IEnumerator DownloadText(string url, System.Action<string> callback)
    {
        UnityWebRequest www = UnityWebRequest.Get(url);

        yield return www.SendWebRequest();

        if (www.result != UnityWebRequest.Result.Success)
        {
            Debug.Log(url);
            Debug.Log(www.error);
            callback(null);
        }
        else
        {
            callback(www.downloadHandler.text);
        }
    }

    public class JsonSmall
    {
        public string updated_at;
    }
}