350 lines
14 KiB
C#
350 lines
14 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Common.Configuration;
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using MediaBrowser.Common.Extensions;
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using MediaBrowser.Common.Net;
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using MediaBrowser.Controller.Configuration;
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using MediaBrowser.Controller.Providers;
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using MediaBrowser.Controller.Security;
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using MediaBrowser.Controller.Subtitles;
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using MediaBrowser.Model.Dto;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.IO;
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using MediaBrowser.Model.Providers;
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using MediaBrowser.Model.Serialization;
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using Microsoft.Extensions.Logging;
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using OpenSubtitlesHandler;
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namespace MediaBrowser.MediaEncoding.Subtitles
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{
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public class OpenSubtitleDownloader : ISubtitleProvider, IDisposable
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{
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private readonly ILogger _logger;
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private readonly IHttpClient _httpClient;
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private readonly CultureInfo _usCulture = new CultureInfo("en-US");
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private readonly IServerConfigurationManager _config;
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private readonly IEncryptionManager _encryption;
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private readonly IJsonSerializer _json;
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private readonly IFileSystem _fileSystem;
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public OpenSubtitleDownloader(ILoggerFactory loggerFactory, IHttpClient httpClient, IServerConfigurationManager config, IEncryptionManager encryption, IJsonSerializer json, IFileSystem fileSystem)
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{
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_logger = loggerFactory.CreateLogger(GetType().Name);
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_httpClient = httpClient;
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_config = config;
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_encryption = encryption;
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_json = json;
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_fileSystem = fileSystem;
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_config.NamedConfigurationUpdating += _config_NamedConfigurationUpdating;
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Utilities.HttpClient = httpClient;
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OpenSubtitles.SetUserAgent("jellyfin");
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}
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private const string PasswordHashPrefix = "h:";
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void _config_NamedConfigurationUpdating(object sender, ConfigurationUpdateEventArgs e)
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{
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if (!string.Equals(e.Key, "subtitles", StringComparison.OrdinalIgnoreCase))
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{
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return;
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}
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var options = (SubtitleOptions)e.NewConfiguration;
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if (options != null &&
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!string.IsNullOrWhiteSpace(options.OpenSubtitlesPasswordHash) &&
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!options.OpenSubtitlesPasswordHash.StartsWith(PasswordHashPrefix, StringComparison.OrdinalIgnoreCase))
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{
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options.OpenSubtitlesPasswordHash = EncryptPassword(options.OpenSubtitlesPasswordHash);
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}
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}
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private string EncryptPassword(string password)
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{
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return PasswordHashPrefix + _encryption.EncryptString(password);
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}
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private string DecryptPassword(string password)
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{
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if (password == null ||
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!password.StartsWith(PasswordHashPrefix, StringComparison.OrdinalIgnoreCase))
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{
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return string.Empty;
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}
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return _encryption.DecryptString(password.Substring(2));
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}
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public string Name
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{
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get { return "Open Subtitles"; }
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}
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private SubtitleOptions GetOptions()
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{
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return _config.GetSubtitleConfiguration();
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}
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public IEnumerable<VideoContentType> SupportedMediaTypes
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{
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get
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{
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var options = GetOptions();
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if (string.IsNullOrWhiteSpace(options.OpenSubtitlesUsername) ||
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string.IsNullOrWhiteSpace(options.OpenSubtitlesPasswordHash))
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{
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return new VideoContentType[] { };
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}
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return new[] { VideoContentType.Episode, VideoContentType.Movie };
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}
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}
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public Task<SubtitleResponse> GetSubtitles(string id, CancellationToken cancellationToken)
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{
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return GetSubtitlesInternal(id, GetOptions(), cancellationToken);
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}
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private DateTime _lastRateLimitException;
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private async Task<SubtitleResponse> GetSubtitlesInternal(string id,
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SubtitleOptions options,
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CancellationToken cancellationToken)
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{
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if (string.IsNullOrWhiteSpace(id))
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{
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throw new ArgumentNullException(nameof(id));
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}
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var idParts = id.Split(new[] { '-' }, 3);
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var format = idParts[0];
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var language = idParts[1];
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var ossId = idParts[2];
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var downloadsList = new[] { int.Parse(ossId, _usCulture) };
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await Login(cancellationToken).ConfigureAwait(false);
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if ((DateTime.UtcNow - _lastRateLimitException).TotalHours < 1)
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{
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throw new RateLimitExceededException("OpenSubtitles rate limit reached");
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}
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var resultDownLoad = await OpenSubtitles.DownloadSubtitlesAsync(downloadsList, cancellationToken).ConfigureAwait(false);
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if ((resultDownLoad.Status ?? string.Empty).IndexOf("407", StringComparison.OrdinalIgnoreCase) != -1)
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{
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_lastRateLimitException = DateTime.UtcNow;
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throw new RateLimitExceededException("OpenSubtitles rate limit reached");
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}
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if (!(resultDownLoad is MethodResponseSubtitleDownload))
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{
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throw new Exception("Invalid response type");
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}
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var results = ((MethodResponseSubtitleDownload)resultDownLoad).Results;
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_lastRateLimitException = DateTime.MinValue;
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if (results.Count == 0)
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{
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var msg = string.Format("Subtitle with Id {0} was not found. Name: {1}. Status: {2}. Message: {3}",
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ossId,
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resultDownLoad.Name ?? string.Empty,
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resultDownLoad.Status ?? string.Empty,
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resultDownLoad.Message ?? string.Empty);
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throw new ResourceNotFoundException(msg);
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}
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var data = Convert.FromBase64String(results.First().Data);
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return new SubtitleResponse
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{
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Format = format,
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Language = language,
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Stream = new MemoryStream(Utilities.Decompress(new MemoryStream(data)))
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};
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}
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private DateTime _lastLogin;
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private async Task Login(CancellationToken cancellationToken)
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{
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if ((DateTime.UtcNow - _lastLogin).TotalSeconds < 60)
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{
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return;
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}
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var options = GetOptions();
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var user = options.OpenSubtitlesUsername ?? string.Empty;
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var password = DecryptPassword(options.OpenSubtitlesPasswordHash);
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var loginResponse = await OpenSubtitles.LogInAsync(user, password, "en", cancellationToken).ConfigureAwait(false);
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if (!(loginResponse is MethodResponseLogIn))
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{
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throw new Exception("Authentication to OpenSubtitles failed.");
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}
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_lastLogin = DateTime.UtcNow;
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}
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public async Task<IEnumerable<NameIdPair>> GetSupportedLanguages(CancellationToken cancellationToken)
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{
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await Login(cancellationToken).ConfigureAwait(false);
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var result = OpenSubtitles.GetSubLanguages("en");
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if (!(result is MethodResponseGetSubLanguages))
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{
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_logger.LogError("Invalid response type");
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return new List<NameIdPair>();
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}
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var results = ((MethodResponseGetSubLanguages)result).Languages;
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return results.Select(i => new NameIdPair
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{
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Name = i.LanguageName,
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Id = i.SubLanguageID
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});
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}
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private string NormalizeLanguage(string language)
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{
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// Problem with Greek subtitle download #1349
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if (string.Equals(language, "gre", StringComparison.OrdinalIgnoreCase))
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{
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return "ell";
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}
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return language;
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}
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public async Task<IEnumerable<RemoteSubtitleInfo>> Search(SubtitleSearchRequest request, CancellationToken cancellationToken)
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{
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var imdbIdText = request.GetProviderId(MetadataProviders.Imdb);
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long imdbId = 0;
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switch (request.ContentType)
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{
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case VideoContentType.Episode:
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if (!request.IndexNumber.HasValue || !request.ParentIndexNumber.HasValue || string.IsNullOrEmpty(request.SeriesName))
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{
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_logger.LogDebug("Episode information missing");
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return new List<RemoteSubtitleInfo>();
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}
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break;
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case VideoContentType.Movie:
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if (string.IsNullOrEmpty(request.Name))
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{
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_logger.LogDebug("Movie name missing");
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return new List<RemoteSubtitleInfo>();
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}
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if (string.IsNullOrWhiteSpace(imdbIdText) || !long.TryParse(imdbIdText.TrimStart('t'), NumberStyles.Any, _usCulture, out imdbId))
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{
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_logger.LogDebug("Imdb id missing");
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return new List<RemoteSubtitleInfo>();
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}
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break;
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}
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if (string.IsNullOrEmpty(request.MediaPath))
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{
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_logger.LogDebug("Path Missing");
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return new List<RemoteSubtitleInfo>();
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}
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await Login(cancellationToken).ConfigureAwait(false);
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var subLanguageId = NormalizeLanguage(request.Language);
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string hash;
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using (var fileStream = _fileSystem.OpenRead(request.MediaPath))
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{
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hash = Utilities.ComputeHash(fileStream);
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}
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var fileInfo = _fileSystem.GetFileInfo(request.MediaPath);
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var movieByteSize = fileInfo.Length;
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var searchImdbId = request.ContentType == VideoContentType.Movie ? imdbId.ToString(_usCulture) : "";
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var subtitleSearchParameters = request.ContentType == VideoContentType.Episode
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? new List<SubtitleSearchParameters> {
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new SubtitleSearchParameters(subLanguageId,
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query: request.SeriesName,
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season: request.ParentIndexNumber.Value.ToString(_usCulture),
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episode: request.IndexNumber.Value.ToString(_usCulture))
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}
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: new List<SubtitleSearchParameters> {
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new SubtitleSearchParameters(subLanguageId, imdbid: searchImdbId),
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new SubtitleSearchParameters(subLanguageId, query: request.Name, imdbid: searchImdbId)
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};
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var parms = new List<SubtitleSearchParameters> {
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new SubtitleSearchParameters( subLanguageId,
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movieHash: hash,
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movieByteSize: movieByteSize,
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imdbid: searchImdbId ),
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};
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parms.AddRange(subtitleSearchParameters);
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var result = await OpenSubtitles.SearchSubtitlesAsync(parms.ToArray(), cancellationToken).ConfigureAwait(false);
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if (!(result is MethodResponseSubtitleSearch))
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{
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_logger.LogError("Invalid response type");
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return new List<RemoteSubtitleInfo>();
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}
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Predicate<SubtitleSearchResult> mediaFilter =
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x =>
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request.ContentType == VideoContentType.Episode
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? !string.IsNullOrEmpty(x.SeriesSeason) && !string.IsNullOrEmpty(x.SeriesEpisode) &&
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int.Parse(x.SeriesSeason, _usCulture) == request.ParentIndexNumber &&
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int.Parse(x.SeriesEpisode, _usCulture) == request.IndexNumber
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: !string.IsNullOrEmpty(x.IDMovieImdb) && long.Parse(x.IDMovieImdb, _usCulture) == imdbId;
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var results = ((MethodResponseSubtitleSearch)result).Results;
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// Avoid implicitly captured closure
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var hasCopy = hash;
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return results.Where(x => x.SubBad == "0" && mediaFilter(x) && (!request.IsPerfectMatch || string.Equals(x.MovieHash, hash, StringComparison.OrdinalIgnoreCase)))
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.OrderBy(x => (string.Equals(x.MovieHash, hash, StringComparison.OrdinalIgnoreCase) ? 0 : 1))
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.ThenBy(x => Math.Abs(long.Parse(x.MovieByteSize, _usCulture) - movieByteSize))
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.ThenByDescending(x => int.Parse(x.SubDownloadsCnt, _usCulture))
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.ThenByDescending(x => double.Parse(x.SubRating, _usCulture))
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.Select(i => new RemoteSubtitleInfo
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{
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Author = i.UserNickName,
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Comment = i.SubAuthorComment,
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CommunityRating = float.Parse(i.SubRating, _usCulture),
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DownloadCount = int.Parse(i.SubDownloadsCnt, _usCulture),
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Format = i.SubFormat,
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ProviderName = Name,
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ThreeLetterISOLanguageName = i.SubLanguageID,
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Id = i.SubFormat + "-" + i.SubLanguageID + "-" + i.IDSubtitleFile,
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Name = i.SubFileName,
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DateCreated = DateTime.Parse(i.SubAddDate, _usCulture),
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IsHashMatch = i.MovieHash == hasCopy
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}).Where(i => !string.Equals(i.Format, "sub", StringComparison.OrdinalIgnoreCase) && !string.Equals(i.Format, "idx", StringComparison.OrdinalIgnoreCase));
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}
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public void Dispose()
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{
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_config.NamedConfigurationUpdating -= _config_NamedConfigurationUpdating;
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}
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}
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}
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