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@@ -0,0 +1,222 @@
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+using MediaBrowser.Common.Net;
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+using MediaBrowser.Controller.Configuration;
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+using MediaBrowser.Controller.Entities;
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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 System;
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+using System.IO;
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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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+
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+namespace MediaBrowser.Providers.Music
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+{
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+ public class MusicBrainzAlbumProvider : BaseMetadataProvider
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+ {
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+ internal static MusicBrainzAlbumProvider Current;
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+
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+ private readonly IHttpClient _httpClient;
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+
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+ public MusicBrainzAlbumProvider(ILogManager logManager, IServerConfigurationManager configurationManager, IHttpClient httpClient)
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+ : base(logManager, configurationManager)
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+ {
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+ _httpClient = httpClient;
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+
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+ Current = this;
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+ }
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+
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+ public override bool Supports(BaseItem item)
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+ {
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+ return item is MusicAlbum;
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+ }
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+
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+ public override async Task<bool> FetchAsync(BaseItem item, bool force, CancellationToken cancellationToken)
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+ {
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+ var releaseId = item.GetProviderId(MetadataProviders.Musicbrainz);
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+ var releaseGroupId = item.GetProviderId(MetadataProviders.MusicBrainzReleaseGroup);
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+
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+ if (string.IsNullOrEmpty(releaseId))
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+ {
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+ var result = await GetReleaseResult((MusicAlbum)item, cancellationToken).ConfigureAwait(false);
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+
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+ if (!string.IsNullOrEmpty(result.ReleaseId))
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+ {
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+ releaseId = result.ReleaseId;
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+ item.SetProviderId(MetadataProviders.Musicbrainz, releaseId);
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+ }
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+
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+ if (!string.IsNullOrEmpty(result.ReleaseGroupId))
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+ {
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+ releaseGroupId = result.ReleaseGroupId;
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+ item.SetProviderId(MetadataProviders.MusicBrainzReleaseGroup, releaseGroupId);
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+ }
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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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+
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+ item.SetProviderId(MetadataProviders.MusicBrainzReleaseGroup, releaseGroupId);
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+ }
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+
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+ SetLastRefreshed(item, DateTime.UtcNow);
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+ return true;
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+ }
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+
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+ private Task<ReleaseResult> GetReleaseResult(MusicAlbum album, CancellationToken cancellationToken)
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+ {
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+ var artist = album.Parent;
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+ var artistId = artist.GetProviderId(MetadataProviders.Musicbrainz);
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+
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+ if (!string.IsNullOrEmpty(artistId))
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+ {
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+ return GetReleaseResult(album.Name, artistId, cancellationToken);
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+ }
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+
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+ return GetReleaseResultByArtistName(album.Name, artist.Name, cancellationToken);
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+ }
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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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+
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+ var doc = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false);
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+
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+ return GetReleaseResult(doc);
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+ }
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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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+
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+ var doc = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false);
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+
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+ return GetReleaseResult(doc);
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+ }
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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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+
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+ var result = new ReleaseResult
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+ {
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+
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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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+
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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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+
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+ var releaseGroupIdNode = doc.SelectSingleNode("//mb:release-list/mb:release/mb:release-group/@id", ns);
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+
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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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+
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+ return result;
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+ }
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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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+
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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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+
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+ var doc = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false);
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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 node = doc.SelectSingleNode("//mb:release-group-list/mb:release-group/@id", ns);
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+
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+ return node != null ? node.Value : null;
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+ }
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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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+
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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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+
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+ try
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+ {
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+ var diff = 1500 - (DateTime.Now - _lastRequestDate).TotalMilliseconds;
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+
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+ // MusicBrainz is extremely adamant about limiting to one request per second
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+
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+ if (diff > 0)
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+ {
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+ await Task.Delay(Convert.ToInt32(diff), cancellationToken).ConfigureAwait(false);
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+ }
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+
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+ _lastRequestDate = DateTime.Now;
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+
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+ var doc = new XmlDocument();
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+
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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 = Environment.MachineName
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+
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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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+
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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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+
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+ _musicBrainzResourcePool.Release();
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+ }
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+ }
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+
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+
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+ public override MetadataProviderPriority Priority
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+ {
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+ get { return MetadataProviderPriority.Third; }
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+ }
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+ }
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+}
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Luke Pulverenti