jellyfin-server/MediaBrowser.Providers/Music/MusicBrainzAlbumProvider.cs

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