VRCMelonAssistant/ModAssistant/Classes/External Interfaces/BeatSaver.cs

using System;
using System.IO;
using System.IO.Compression;
using System.Net;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using System.Windows;
using static ModAssistant.Http;

namespace ModAssistant.API
{
    public class BeatSaver
    {
        private const string BeatSaverURLPrefix = "https://beatsaver.com";
        private static readonly string CustomSongsFolder = Path.Combine("Beat Saber_Data", "CustomLevels");
        private const bool BypassDownloadCounter = false;

        public static async Task<BeatSaverMap> GetFromKey(string Key, bool showNotification = true)
        {
            return await GetMap(Key, "key", showNotification);
        }

        public static async Task<BeatSaverMap> GetFromHash(string Hash, bool showNotification = true)
        {
            return await GetMap(Hash, "hash", showNotification);
        }

        private static async Task<BeatSaverMap> GetMap(string id, string type, bool showNotification)
        {
            string urlSegment;
            switch (type)
            {
                case "hash":
                    urlSegment = "/api/maps/by-hash/";
                    break;
                case "key":
                    urlSegment = "/api/maps/detail/";
                    break;
                default:
                    return null;
            }

            BeatSaverMap map = new BeatSaverMap();
            map.Success = false;
            try
            {
                BeatSaverApiResponse beatsaver = await GetResponse(BeatSaverURLPrefix + urlSegment + id);
                map.Name = await InstallMap(beatsaver.map, showNotification);
                map.Success = true;
            }
            catch (Exception e)
            {
                ModAssistant.Utils.Log($"Failed downloading BeatSaver map: {id} | Error: {e}", "ERROR");
            }
            return map;
        }

        private static async Task<BeatSaverApiResponse> GetResponse(string url, bool showNotification = true)
        {
            BeatSaverApiResponse response = new BeatSaverApiResponse();
            try
            {
                var resp = await HttpClient.GetAsync(url);
                response.statusCode = resp.StatusCode;
                response.ratelimit = GetRatelimit(resp.Headers);
                if (response.statusCode == HttpStatusCode.OK)
                {
                    if (response.ratelimit.IsSafe)
                    {
                        string body = await resp.Content.ReadAsStringAsync();
                        response.map = JsonSerializer.Deserialize<BeatSaverApiResponseMap>(body);
                        return response;
                    }
                    else
                    {
                        return response;
                    }
                }
                else
                {
                    return response;
                }
            }
            catch (Exception e)
            {
                if (showNotification)
                {
                    MessageBox.Show($"{Application.Current.FindResource("OneClick:MapDownloadFailed")}\n\n" + e);
                }
                return null;
            }
        }

        private static BeatSaverRatelimit GetRatelimit(HttpResponseHeaders headers)
        {
            BeatSaverRatelimit ratelimit = new BeatSaverRatelimit();

            var _rateLimitRemaining = headers.GetValues("Rate-Limit-Remaining").GetEnumerator();
            var _rateLimitReset = headers.GetValues("Rate-Limit-Reset").GetEnumerator();
            var _rateLimitTotal = headers.GetValues("Rate-Limit-Total").GetEnumerator();
            _rateLimitRemaining.MoveNext();
            _rateLimitReset.MoveNext();
            _rateLimitTotal.MoveNext();
            ratelimit.Remaining = Int32.Parse(_rateLimitRemaining.Current);
            ratelimit.Reset = Int32.Parse(_rateLimitReset.Current);
            ratelimit.Total = Int32.Parse(_rateLimitTotal.Current);
            ratelimit.ResetTime = UnixTimestampToDateTime((long)ratelimit.Reset);

            return ratelimit;
        }

        public static DateTime UnixTimestampToDateTime(double unixTime)
        {
            DateTime unixStart = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);
            long unixTimeStampInTicks = (long)(unixTime * TimeSpan.TicksPerSecond);
            return new DateTime(unixStart.Ticks + unixTimeStampInTicks, System.DateTimeKind.Utc);
        }

        public static async Task<string> InstallMap(BeatSaverApiResponseMap Map, bool showNotification = true)
        {
            string zip = Path.Combine(Utils.BeatSaberPath, CustomSongsFolder, Map.hash) + ".zip";
            string mapName = string.Concat(($"{Map.key} ({Map.metadata.songName} - {Map.metadata.levelAuthorName})")
                             .Split(ModAssistant.Utils.Constants.IllegalCharacters));
            string directory = Path.Combine(Utils.BeatSaberPath, CustomSongsFolder, mapName);

#pragma warning disable CS0162 // Unreachable code detected
            if (BypassDownloadCounter)
            {
                await Utils.DownloadAsset(BeatSaverURLPrefix + Map.directDownload, CustomSongsFolder, Map.hash + ".zip", mapName, showNotification);
            }
            else
            {
                await Utils.DownloadAsset(BeatSaverURLPrefix + Map.downloadURL, CustomSongsFolder, Map.hash + ".zip", mapName, showNotification);
            }
#pragma warning restore CS0162 // Unreachable code detected

            if (File.Exists(zip))
            {
                using (FileStream stream = new FileStream(zip, FileMode.Open))
                using (ZipArchive archive = new ZipArchive(stream))
                {
                    foreach (ZipArchiveEntry file in archive.Entries)
                    {
                        string fileDirectory = Path.GetDirectoryName(Path.Combine(directory, file.FullName));
                        if (!Directory.Exists(fileDirectory))
                        {
                            Directory.CreateDirectory(fileDirectory);
                        }

                        if (!string.IsNullOrEmpty(file.Name))
                        {
                            file.ExtractToFile(Path.Combine(directory, file.FullName), true);
                        }
                    }
                }

                File.Delete(zip);
            }
            else
            {
                if (showNotification)
                {
                    string line1 = (string)Application.Current.FindResource("OneClick:SongDownload:Failed");
                    string line2 = (string)Application.Current.FindResource("OneClick:SongDownload:NetworkIssues");
                    string title = (string)Application.Current.FindResource("OneClick:SongDownload:FailedTitle");
                    MessageBox.Show($"{line1}\n{line2}", title);
                }
                return null;
            }
            return mapName;
        }

        public class BeatSaverMap
        {
            public BeatSaverApiResponse response { get; set; }
            public bool Success { get; set; }
            public string Name { get; set; }
        }

        public class BeatSaverApiResponse
        {
            public HttpStatusCode statusCode { get; set; }
            public BeatSaverRatelimit ratelimit { get; set;}
            public BeatSaverApiResponseMap map { get; set; }
        }

        public class BeatSaverRatelimit
        {
            public int Remaining { get; set; }
            public int Total { get; set; }
            public int Reset { get; set; }
            public DateTime ResetTime { get; set; }
            public bool IsSafe
            {
                get
                {
                    if (Remaining > 3) return true;
                    else return false;
                }
            }

            public async Task Wait()
            {
                await Task.Delay(new TimeSpan(ResetTime.Ticks - DateTime.Now.Ticks));
            }
        }

        public class BeatSaverApiResponseMap
        {
            public Metadata metadata { get; set; }
            public Stats stats { get; set; }
            public string description { get; set; }
            public DateTime? deletedAt { get; set; }
            public string _id { get; set; }
            public string key { get; set; }
            public string name { get; set; }
            public Uploader uploader { get; set; }
            public DateTime uploaded { get; set; }
            public string hash { get; set; }
            public string directDownload { get; set; }
            public string downloadURL { get; set; }
            public string coverURL { get; set; }

            public class Difficulties
            {
                public bool easy { get; set; }
                public bool normal { get; set; }
                public bool hard { get; set; }
                public bool expert { get; set; }
                public bool expertPlus { get; set; }
            }

            public class Metadata
            {
                public Difficulties difficulties { get; set; }
                public Characteristic[] characteristics { get; set; }
                public double duration { get; set; }
                public string songName { get; set; }
                public string songSubName { get; set; }
                public string songAuthorName { get; set; }
                public string levelAuthorName { get; set; }
                public double bpm { get; set; }
            }

            public class Characteristic
            {
                public string name { get; set; }
                public CharacteristicDifficulties difficulties { get; set; }
            }

            public class CharacteristicDifficulties
            {
                public Difficulty easy { get; set; }
                public Difficulty normal { get; set; }
                public Difficulty hard { get; set; }
                public Difficulty expert { get; set; }
                public Difficulty expertPlus { get; set; }
            }

            public class Difficulty
            {
                public double? duration { get; set; }
                public double? length { get; set; }
                public double bombs { get; set; }
                public double notes { get; set; }
                public double obstacles { get; set; }
                public double njs { get; set; }
                public double njsOffset { get; set; }
            }

            public class Stats
            {
                public int downloads { get; set; }
                public int plays { get; set; }
                public int downVotes { get; set; }
                public int upVotes { get; set; }
                public double heat { get; set; }
                public double rating { get; set; }
            }

            public class Uploader
            {
                public string _id { get; set; }
                public string username { get; set; }
            }
        }
    }
}