334 lines
12 KiB
C#
334 lines
12 KiB
C#
using MediaBrowser.Common;
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using MediaBrowser.Common.Net;
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using MediaBrowser.Controller.Entities.Audio;
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using MediaBrowser.Controller.Providers;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Providers;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Xml;
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namespace MediaBrowser.Providers.Music
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{
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public class MusicBrainzAlbumProvider : IRemoteMetadataProvider<MusicAlbum, AlbumInfo>, IHasOrder
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{
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internal static MusicBrainzAlbumProvider Current;
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private readonly IHttpClient _httpClient;
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private readonly IApplicationHost _appHost;
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private readonly ILogger _logger;
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public MusicBrainzAlbumProvider(IHttpClient httpClient, IApplicationHost appHost, ILogger logger)
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{
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_httpClient = httpClient;
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_appHost = appHost;
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_logger = logger;
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Current = this;
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}
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public async Task<IEnumerable<RemoteSearchResult>> GetSearchResults(AlbumInfo searchInfo, CancellationToken cancellationToken)
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{
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var releaseId = searchInfo.GetReleaseId();
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string url = null;
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if (!string.IsNullOrEmpty(releaseId))
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{
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url = string.Format("http://www.musicbrainz.org/ws/2/release/?query=reid:{0}", releaseId);
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}
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else
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{
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var artistMusicBrainzId = searchInfo.GetMusicBrainzArtistId();
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if (!string.IsNullOrWhiteSpace(artistMusicBrainzId))
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{
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url = string.Format("http://www.musicbrainz.org/ws/2/release/?query=\"{0}\" AND arid:{1}",
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WebUtility.UrlEncode(searchInfo.Name),
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artistMusicBrainzId);
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}
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else
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{
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url = string.Format("http://www.musicbrainz.org/ws/2/release/?query=\"{0}\" AND artist:\"{1}\"",
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WebUtility.UrlEncode(searchInfo.Name),
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WebUtility.UrlEncode(searchInfo.GetAlbumArtist()));
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}
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}
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if (!string.IsNullOrWhiteSpace(url))
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{
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var doc = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false);
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return GetResultsFromResponse(doc);
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}
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return new List<RemoteSearchResult>();
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}
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private IEnumerable<RemoteSearchResult> GetResultsFromResponse(XmlDocument doc)
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{
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var ns = new XmlNamespaceManager(doc.NameTable);
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ns.AddNamespace("mb", "http://musicbrainz.org/ns/mmd-2.0#");
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var list = new List<RemoteSearchResult>();
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var nodes = doc.SelectNodes("//mb:release-list/mb:release", ns);
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if (nodes != null)
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{
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foreach (var node in nodes.Cast<XmlNode>())
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{
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if (node.Attributes != null)
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{
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string name = null;
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string mbzId = node.Attributes["id"].Value;
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var nameNode = node.SelectSingleNode("//mb:title", ns);
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if (nameNode != null)
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{
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name = nameNode.InnerText;
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}
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if (!string.IsNullOrWhiteSpace(mbzId) && !string.IsNullOrWhiteSpace(name))
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{
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var result = new RemoteSearchResult
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{
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Name = name
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};
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result.SetProviderId(MetadataProviders.MusicBrainzAlbum, mbzId);
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list.Add(result);
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}
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}
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}
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}
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return list;
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}
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public async Task<MetadataResult<MusicAlbum>> GetMetadata(AlbumInfo id, CancellationToken cancellationToken)
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{
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var releaseId = id.GetReleaseId();
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var releaseGroupId = id.GetReleaseGroupId();
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var result = new MetadataResult<MusicAlbum>
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{
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Item = new MusicAlbum()
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};
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if (string.IsNullOrEmpty(releaseId))
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{
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var artistMusicBrainzId = id.GetMusicBrainzArtistId();
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var releaseResult = await GetReleaseResult(artistMusicBrainzId, id.GetAlbumArtist(), id.Name, cancellationToken).ConfigureAwait(false);
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if (!string.IsNullOrEmpty(releaseResult.ReleaseId))
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{
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releaseId = releaseResult.ReleaseId;
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result.HasMetadata = true;
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}
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if (!string.IsNullOrEmpty(releaseResult.ReleaseGroupId))
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{
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releaseGroupId = releaseResult.ReleaseGroupId;
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result.HasMetadata = true;
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}
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}
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// If we have a release Id but not a release group Id...
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if (!string.IsNullOrEmpty(releaseId) && string.IsNullOrEmpty(releaseGroupId))
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{
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releaseGroupId = await GetReleaseGroupId(releaseId, cancellationToken).ConfigureAwait(false);
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result.HasMetadata = true;
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}
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if (result.HasMetadata)
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{
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if (!string.IsNullOrEmpty(releaseId))
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{
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result.Item.SetProviderId(MetadataProviders.MusicBrainzAlbum, releaseId);
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}
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if (!string.IsNullOrEmpty(releaseGroupId))
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{
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result.Item.SetProviderId(MetadataProviders.MusicBrainzReleaseGroup, releaseGroupId);
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}
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}
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return result;
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}
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public string Name
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{
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get { return "MusicBrainz"; }
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}
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private Task<ReleaseResult> GetReleaseResult(string artistMusicBrainId, string artistName, string albumName, CancellationToken cancellationToken)
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{
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if (!string.IsNullOrEmpty(artistMusicBrainId))
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{
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return GetReleaseResult(albumName, artistMusicBrainId, cancellationToken);
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}
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if (string.IsNullOrWhiteSpace(artistName))
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{
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return Task.FromResult(new ReleaseResult());
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}
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return GetReleaseResultByArtistName(albumName, artistName, cancellationToken);
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}
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private async Task<ReleaseResult> GetReleaseResult(string albumName, string artistId, CancellationToken cancellationToken)
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{
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var url = string.Format("http://www.musicbrainz.org/ws/2/release/?query=\"{0}\" AND arid:{1}",
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WebUtility.UrlEncode(albumName),
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artistId);
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var doc = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false);
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return GetReleaseResult(doc);
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}
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private async Task<ReleaseResult> GetReleaseResultByArtistName(string albumName, string artistName, CancellationToken cancellationToken)
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{
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var url = string.Format("http://www.musicbrainz.org/ws/2/release/?query=\"{0}\" AND artist:\"{1}\"",
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WebUtility.UrlEncode(albumName),
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WebUtility.UrlEncode(artistName));
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var doc = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false);
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return GetReleaseResult(doc);
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}
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private ReleaseResult GetReleaseResult(XmlDocument doc)
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{
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var ns = new XmlNamespaceManager(doc.NameTable);
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ns.AddNamespace("mb", "http://musicbrainz.org/ns/mmd-2.0#");
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var result = new ReleaseResult
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{
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};
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var releaseIdNode = doc.SelectSingleNode("//mb:release-list/mb:release/@id", ns);
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if (releaseIdNode != null)
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{
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result.ReleaseId = releaseIdNode.Value;
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}
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var releaseGroupIdNode = doc.SelectSingleNode("//mb:release-list/mb:release/mb:release-group/@id", ns);
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if (releaseGroupIdNode != null)
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{
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result.ReleaseGroupId = releaseGroupIdNode.Value;
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}
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return result;
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}
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private class ReleaseResult
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{
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public string ReleaseId;
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public string ReleaseGroupId;
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}
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/// <summary>
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/// Gets the release group id internal.
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/// </summary>
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/// <param name="releaseEntryId">The release entry id.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task{System.String}.</returns>
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private async Task<string> GetReleaseGroupId(string releaseEntryId, CancellationToken cancellationToken)
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{
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var url = string.Format("http://www.musicbrainz.org/ws/2/release-group/?query=reid:{0}", releaseEntryId);
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var doc = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false);
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var ns = new XmlNamespaceManager(doc.NameTable);
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ns.AddNamespace("mb", "http://musicbrainz.org/ns/mmd-2.0#");
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var node = doc.SelectSingleNode("//mb:release-group-list/mb:release-group/@id", ns);
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return node != null ? node.Value : null;
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}
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/// <summary>
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/// The _last music brainz request
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/// </summary>
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private DateTime _lastRequestDate = DateTime.MinValue;
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/// <summary>
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/// The _music brainz resource pool
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/// </summary>
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private readonly SemaphoreSlim _musicBrainzResourcePool = new SemaphoreSlim(1, 1);
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/// <summary>
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/// Gets the music brainz response.
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/// </summary>
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/// <param name="url">The URL.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task{XmlDocument}.</returns>
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internal async Task<XmlDocument> GetMusicBrainzResponse(string url, CancellationToken cancellationToken)
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{
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await _musicBrainzResourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
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try
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{
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var diff = 1500 - (DateTime.Now - _lastRequestDate).TotalMilliseconds;
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// MusicBrainz is extremely adamant about limiting to one request per second
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if (diff > 0)
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{
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_logger.Debug("Throttling musicbrainz by {0} ms", diff);
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await Task.Delay(Convert.ToInt32(diff), cancellationToken).ConfigureAwait(false);
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}
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var doc = new XmlDocument();
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var userAgent = _appHost.Name + "/" + _appHost.ApplicationVersion;
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using (var xml = await _httpClient.Get(new HttpRequestOptions
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{
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Url = url,
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CancellationToken = cancellationToken,
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UserAgent = userAgent
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}).ConfigureAwait(false))
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{
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using (var oReader = new StreamReader(xml, Encoding.UTF8))
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{
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doc.Load(oReader);
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}
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}
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return doc;
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}
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finally
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{
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_lastRequestDate = DateTime.Now;
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_musicBrainzResourcePool.Release();
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}
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}
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public int Order
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{
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get { return 0; }
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}
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public Task<HttpResponseInfo> GetImageResponse(string url, CancellationToken cancellationToken)
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{
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throw new NotImplementedException();
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}
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}
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}
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