ZonyLrcToolsX/src/ZonyLrcTools.Common/Lyrics/Providers/KuGou/KuGouLyricsProvider.cs

using System.Text;
using Microsoft.Extensions.Options;
using Newtonsoft.Json.Linq;
using ZonyLrcTools.Common.Configuration;
using ZonyLrcTools.Common.Infrastructure.Exceptions;
using ZonyLrcTools.Common.Infrastructure.Network;
using ZonyLrcTools.Common.Lyrics.Providers.KuGou.JsonModel;

namespace ZonyLrcTools.Common.Lyrics.Providers.KuGou
{
    public class KuGouLyricsProvider : LyricsProvider
    {
        public override string DownloaderName => InternalLyricsProviderNames.KuGou;

        private readonly IWarpHttpClient _warpHttpClient;
        private readonly ILyricsItemCollectionFactory _lyricsItemCollectionFactory;
        private readonly GlobalOptions _options;

        private const string KuGouSearchMusicUrl = @"https://songsearch.kugou.com/song_search_v2";
        private const string KuGouGetLyricAccessKeyUrl = @"http://lyrics.kugou.com/search";
        private const string KuGouGetLyricUrl = @"http://lyrics.kugou.com/download";

        public KuGouLyricsProvider(IWarpHttpClient warpHttpClient,
            ILyricsItemCollectionFactory lyricsItemCollectionFactory,
            IOptions<GlobalOptions> options)
        {
            _warpHttpClient = warpHttpClient;
            _lyricsItemCollectionFactory = lyricsItemCollectionFactory;
            _options = options.Value;
        }

        protected override async ValueTask<object> DownloadDataAsync(LyricsProviderArgs args)
        {
            var searchResult = await _warpHttpClient.GetAsync<SongSearchResponse>(KuGouSearchMusicUrl,
                new SongSearchRequest(args.SongName, args.Artist, _options.Provider.Lyric.GetLyricProviderOption(DownloaderName).Depth));

            ValidateSongSearchResponse(searchResult, args);

            // 获得特殊的 AccessToken 与 Id，真正请求歌词数据。
            var accessKeyResponse = await _warpHttpClient.GetAsync<GetLyricAccessKeyResponse>(KuGouGetLyricAccessKeyUrl,
                new GetLyricAccessKeyRequest(searchResult.Data?.List?[0].FileHash));

            if (accessKeyResponse.AccessKeyDataObjects == null || accessKeyResponse.AccessKeyDataObjects.Count == 0)
            {
                throw new ErrorCodeException(ErrorCodes.NoMatchingSong, attachObj: args);
            }

            var accessKeyObject = accessKeyResponse.AccessKeyDataObjects[0];
            return await _warpHttpClient.GetAsync(KuGouGetLyricUrl,
                new GetLyricRequest(accessKeyObject.Id, accessKeyObject.AccessKey));
        }

        protected override async ValueTask<LyricsItemCollection> GenerateLyricAsync(object data, LyricsProviderArgs args)
        {
            await ValueTask.CompletedTask;
            var lyricJsonObj = JObject.Parse((data as string)!);
            if (lyricJsonObj.SelectToken("$.status")?.Value<int>() != 200)
            {
                throw new ErrorCodeException(ErrorCodes.NoMatchingSong, attachObj: args);
            }

            var lyricText = Encoding.UTF8.GetString(Convert.FromBase64String(lyricJsonObj.SelectToken("$.content")?.Value<string>() ?? string.Empty));
            return _lyricsItemCollectionFactory.Build(lyricText);
        }

        protected virtual void ValidateSongSearchResponse(SongSearchResponse response, LyricsProviderArgs args)
        {
            if ((response.ErrorCode != 0 && response.Status != 1) || response.Data?.List?.Count == 0)
            {
                throw new ErrorCodeException(ErrorCodes.NoMatchingSong, attachObj: args);
            }
        }
    }
}