jellyfin/MediaBrowser.Providers/Music/MusicBrainzAlbumProvider.cs
2016-06-20 13:07:02 -04:00

441 lines
15 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;
using MediaBrowser.Model.Serialization;
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;
private readonly IJsonSerializer _json;
public static string MusicBrainzBaseUrl = "https://www.musicbrainz.org";
public MusicBrainzAlbumProvider(IHttpClient httpClient, IApplicationHost appHost, ILogger logger, IJsonSerializer json)
{
_httpClient = httpClient;
_appHost = appHost;
_logger = logger;
_json = json;
Current = this;
}
public async Task<IEnumerable<RemoteSearchResult>> GetSearchResults(AlbumInfo searchInfo, CancellationToken cancellationToken)
{
var releaseId = searchInfo.GetReleaseId();
string url = null;
var isNameSearch = false;
if (!string.IsNullOrEmpty(releaseId))
{
url = string.Format("/ws/2/release/?query=reid:{0}", releaseId);
}
else
{
var artistMusicBrainzId = searchInfo.GetMusicBrainzArtistId();
if (!string.IsNullOrWhiteSpace(artistMusicBrainzId))
{
url = string.Format("/ws/2/release/?query=\"{0}\" AND arid:{1}",
WebUtility.UrlEncode(searchInfo.Name),
artistMusicBrainzId);
}
else
{
isNameSearch = true;
url = string.Format("/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, isNameSearch, 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", MusicBrainzBaseUrl + "/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 (!string.IsNullOrEmpty(releaseId) || !string.IsNullOrEmpty(releaseGroupId))
{
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("/ws/2/release/?query=\"{0}\" AND arid:{1}",
WebUtility.UrlEncode(albumName),
artistId);
var doc = await GetMusicBrainzResponse(url, true, cancellationToken).ConfigureAwait(false);
return ReleaseResult.Parse(doc);
}
private async Task<ReleaseResult> GetReleaseResultByArtistName(string albumName, string artistName, CancellationToken cancellationToken)
{
var url = string.Format("/ws/2/release/?query=\"{0}\" AND artist:\"{1}\"",
WebUtility.UrlEncode(albumName),
WebUtility.UrlEncode(artistName));
var doc = await GetMusicBrainzResponse(url, true, cancellationToken).ConfigureAwait(false);
return ReleaseResult.Parse(doc);
}
private class ReleaseResult
{
public string ReleaseId;
public string ReleaseGroupId;
public static ReleaseResult Parse(XmlDocument doc)
{
var docElem = doc.DocumentElement;
if (docElem == null)
{
return new ReleaseResult();
}
var releaseList = docElem.FirstChild;
if (releaseList == null)
{
return new ReleaseResult();
}
var nodes = releaseList.ChildNodes;
string releaseId = null;
string releaseGroupId = null;
if (nodes != null)
{
foreach (var node in nodes.Cast<XmlNode>())
{
if (string.Equals(node.Name, "release", StringComparison.OrdinalIgnoreCase))
{
releaseId = node.Attributes["id"].Value;
releaseGroupId = GetReleaseGroupIdFromReleaseNode(node);
break;
}
}
}
return new ReleaseResult
{
ReleaseId = releaseId,
ReleaseGroupId = releaseGroupId
};
}
private static string GetReleaseGroupIdFromReleaseNode(XmlNode node)
{
var subNodes = node.ChildNodes;
if (subNodes != null)
{
foreach (var subNode in subNodes.Cast<XmlNode>())
{
if (string.Equals(subNode.Name, "release-group", StringComparison.OrdinalIgnoreCase))
{
return subNode.Attributes["id"].Value;
}
}
}
return null;
}
}
/// <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("/ws/2/release-group/?query=reid:{0}", releaseEntryId);
var doc = await GetMusicBrainzResponse(url, false, cancellationToken).ConfigureAwait(false);
var docElem = doc.DocumentElement;
if (docElem == null)
{
return null;
}
var releaseList = docElem.FirstChild;
if (releaseList == null)
{
return null;
}
var nodes = releaseList.ChildNodes;
if (nodes != null)
{
foreach (var node in nodes.Cast<XmlNode>())
{
if (string.Equals(node.Name, "release-group", StringComparison.OrdinalIgnoreCase))
{
return node.Attributes["id"].Value;
}
}
}
return null;
}
/// <summary>
/// The _music brainz resource pool
/// </summary>
private readonly SemaphoreSlim _musicBrainzResourcePool = new SemaphoreSlim(1, 1);
private long _lastMbzUrlQueryTicks = 0;
private List<MbzUrl> _mbzUrls = null;
private MbzUrl _chosenUrl;
private async Task<MbzUrl> GetMbzUrl()
{
if (_chosenUrl == null || _mbzUrls == null || (DateTime.UtcNow.Ticks - _lastMbzUrlQueryTicks) > TimeSpan.FromHours(12).Ticks)
{
var urls = await RefreshMzbUrls().ConfigureAwait(false);
_chosenUrl = urls[new Random().Next(0, urls.Count - 1)];
}
return _chosenUrl;
}
private async Task<List<MbzUrl>> RefreshMzbUrls()
{
List<MbzUrl> list;
try
{
var options = new HttpRequestOptions
{
Url = "https://mb3admin.com/admin/service/standards/musicBrainzUrls",
UserAgent = _appHost.Name + "/" + _appHost.ApplicationVersion
};
using (var stream = await _httpClient.Get(options).ConfigureAwait(false))
{
list = _json.DeserializeFromStream<List<MbzUrl>>(stream);
}
}
catch (Exception ex)
{
_logger.ErrorException("Error getting music brainz info", ex);
list = new List<MbzUrl>
{
new MbzUrl
{
url = MusicBrainzBaseUrl,
throttleMs = 1000
}
};
}
_mbzUrls = list.ToList();
return list;
}
/// <summary>
/// Gets the music brainz response.
/// </summary>
/// <param name="url">The URL.</param>
/// <param name="isSearch">if set to <c>true</c> [is search].</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task{XmlDocument}.</returns>
internal async Task<XmlDocument> GetMusicBrainzResponse(string url, bool isSearch, CancellationToken cancellationToken)
{
var urlInfo = await GetMbzUrl().ConfigureAwait(false);
if (urlInfo.throttleMs > 0)
{
// MusicBrainz is extremely adamant about limiting to one request per second
await Task.Delay(urlInfo.throttleMs, cancellationToken).ConfigureAwait(false);
}
url = urlInfo.url.TrimEnd('/') + url;
var doc = new XmlDocument();
var options = new HttpRequestOptions
{
Url = url,
CancellationToken = cancellationToken,
UserAgent = _appHost.Name + "/" + _appHost.ApplicationVersion,
ResourcePool = _musicBrainzResourcePool
};
using (var xml = await _httpClient.Get(options).ConfigureAwait(false))
{
using (var oReader = new StreamReader(xml, Encoding.UTF8))
{
doc.Load(oReader);
}
}
return doc;
}
public int Order
{
get { return 0; }
}
public Task<HttpResponseInfo> GetImageResponse(string url, CancellationToken cancellationToken)
{
throw new NotImplementedException();
}
internal class MbzUrl
{
public string url { get; set; }
public int throttleMs { get; set; }
}
}
}