jellyfin/MediaBrowser.Providers/Music/MusicBrainzAlbumProvider.cs
Luke Pulverenti 5de8b92fe5 updated nuget
2014-09-03 21:44:40 -04:00

334 lines
12 KiB
C#

using MediaBrowser.Common;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Entities.Audio;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Providers;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
namespace MediaBrowser.Providers.Music
{
public class MusicBrainzAlbumProvider : IRemoteMetadataProvider<MusicAlbum, AlbumInfo>, IHasOrder
{
internal static MusicBrainzAlbumProvider Current;
private readonly IHttpClient _httpClient;
private readonly IApplicationHost _appHost;
private readonly ILogger _logger;
public MusicBrainzAlbumProvider(IHttpClient httpClient, IApplicationHost appHost, ILogger logger)
{
_httpClient = httpClient;
_appHost = appHost;
_logger = logger;
Current = this;
}
public async Task<IEnumerable<RemoteSearchResult>> GetSearchResults(AlbumInfo searchInfo, CancellationToken cancellationToken)
{
var releaseId = searchInfo.GetReleaseId();
string url = null;
if (!string.IsNullOrEmpty(releaseId))
{
url = string.Format("http://www.musicbrainz.org/ws/2/release/?query=reid:{0}", releaseId);
}
else
{
var artistMusicBrainzId = searchInfo.GetMusicBrainzArtistId();
if (!string.IsNullOrWhiteSpace(artistMusicBrainzId))
{
url = string.Format("http://www.musicbrainz.org/ws/2/release/?query=\"{0}\" AND arid:{1}",
WebUtility.UrlEncode(searchInfo.Name),
artistMusicBrainzId);
}
else
{
url = string.Format("http://www.musicbrainz.org/ws/2/release/?query=\"{0}\" AND artist:\"{1}\"",
WebUtility.UrlEncode(searchInfo.Name),
WebUtility.UrlEncode(searchInfo.GetAlbumArtist()));
}
}
if (!string.IsNullOrWhiteSpace(url))
{
var doc = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false);
return GetResultsFromResponse(doc);
}
return new List<RemoteSearchResult>();
}
private IEnumerable<RemoteSearchResult> GetResultsFromResponse(XmlDocument doc)
{
var ns = new XmlNamespaceManager(doc.NameTable);
ns.AddNamespace("mb", "http://musicbrainz.org/ns/mmd-2.0#");
var list = new List<RemoteSearchResult>();
var nodes = doc.SelectNodes("//mb:release-list/mb:release", ns);
if (nodes != null)
{
foreach (var node in nodes.Cast<XmlNode>())
{
if (node.Attributes != null)
{
string name = null;
string mbzId = node.Attributes["id"].Value;
var nameNode = node.SelectSingleNode("//mb:title", ns);
if (nameNode != null)
{
name = nameNode.InnerText;
}
if (!string.IsNullOrWhiteSpace(mbzId) && !string.IsNullOrWhiteSpace(name))
{
var result = new RemoteSearchResult
{
Name = name
};
result.SetProviderId(MetadataProviders.MusicBrainzAlbum, mbzId);
list.Add(result);
}
}
}
}
return list;
}
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))
{
var artistMusicBrainzId = id.GetMusicBrainzArtistId();
var releaseResult = await GetReleaseResult(artistMusicBrainzId, id.GetAlbumArtist(), id.Name, cancellationToken).ConfigureAwait(false);
if (!string.IsNullOrEmpty(releaseResult.ReleaseId))
{
releaseId = releaseResult.ReleaseId;
result.HasMetadata = true;
}
if (!string.IsNullOrEmpty(releaseResult.ReleaseGroupId))
{
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);
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);
}
}
return result;
}
public string Name
{
get { return "MusicBrainz"; }
}
private Task<ReleaseResult> GetReleaseResult(string artistMusicBrainId, string artistName, string albumName, CancellationToken cancellationToken)
{
if (!string.IsNullOrEmpty(artistMusicBrainId))
{
return GetReleaseResult(albumName, artistMusicBrainId, cancellationToken);
}
if (string.IsNullOrWhiteSpace(artistName))
{
return Task.FromResult(new ReleaseResult());
}
return GetReleaseResultByArtistName(albumName, artistName, cancellationToken);
}
private async Task<ReleaseResult> GetReleaseResult(string albumName, string artistId, CancellationToken cancellationToken)
{
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)
{
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)
{
_logger.Debug("Throttling musicbrainz by {0} ms", diff);
await Task.Delay(Convert.ToInt32(diff), cancellationToken).ConfigureAwait(false);
}
var doc = new XmlDocument();
var userAgent = _appHost.Name + "/" + _appHost.ApplicationVersion;
using (var xml = await _httpClient.Get(new HttpRequestOptions
{
Url = url,
CancellationToken = cancellationToken,
UserAgent = userAgent
}).ConfigureAwait(false))
{
using (var oReader = new StreamReader(xml, Encoding.UTF8))
{
doc.Load(oReader);
}
}
return doc;
}
finally
{
_lastRequestDate = DateTime.Now;
_musicBrainzResourcePool.Release();
}
}
public int Order
{
get { return 0; }
}
public Task<HttpResponseInfo> GetImageResponse(string url, CancellationToken cancellationToken)
{
throw new NotImplementedException();
}
}
}