feat: Completed the QQ music lyrics downloader.

完成了 QQ 音乐歌词下载器。

src/ZonyLrcTools.Cli/Infrastructure/Lyric/KuGou/KuGourLyricDownloader.cs

@@ -22,7 +22,7 @@ namespace ZonyLrcTools.Cli.Infrastructure.Lyric.KuGou
             throw new System.NotImplementedException();
         }
 
-        protected override ValueTask<LyricItemCollection> GenerateLyricAsync(byte[] data)
+        protected override ValueTask<LyricItemCollection> GenerateLyricAsync(byte[] data, LyricDownloaderArgs args)
         {
             throw new System.NotImplementedException();
         }

src/ZonyLrcTools.Cli/Infrastructure/Lyric/QQMusic/JsonModel/GetLyricRequest.cs

@@ -0,0 +1,33 @@
+using Newtonsoft.Json;
+
+namespace ZonyLrcTools.Cli.Infrastructure.Lyric.QQMusic.JsonModel
+{
+    public class GetLyricRequest
+    {
+        [JsonProperty("nobase64")] public int IsNoBase64Encoding { get; set; }
+
+        [JsonProperty("songmid")] public string SongId { get; set; }
+
+        [JsonProperty("platform")] public string ClientPlatform { get; set; }
+
+        [JsonProperty("inCharset")] public string InCharset { get; set; }
+
+        [JsonProperty("outCharset")] public string OutCharset { get; set; }
+
+        [JsonProperty("g_tk")] public int Gtk { get; set; }
+
+        protected GetLyricRequest()
+        {
+        }
+
+        public GetLyricRequest(string songId)
+        {
+            IsNoBase64Encoding = 1;
+            SongId = songId;
+            ClientPlatform = "yqq";
+            InCharset = "utf8";
+            OutCharset = "utf-8";
+            Gtk = 5381;
+        }
+    }
+}

src/ZonyLrcTools.Cli/Infrastructure/Lyric/QQMusic/QQLyricDownloader.cs

@@ -1,4 +1,10 @@
+using System;
+using System.Linq;
+using System.Text;
 using System.Threading.Tasks;
+using System.Web;
+using Newtonsoft.Json.Linq;
+using ZonyLrcTools.Cli.Infrastructure.Exceptions;
 using ZonyLrcTools.Cli.Infrastructure.Lyric.QQMusic.JsonModel;
 using ZonyLrcTools.Cli.Infrastructure.Network;
 
@@ -12,6 +18,9 @@ namespace ZonyLrcTools.Cli.Infrastructure.Lyric.QQMusic
         private readonly ILyricItemCollectionFactory _lyricItemCollectionFactory;
 
         private const string QQSearchMusicUrl = @"https://c.y.qq.com/soso/fcgi-bin/client_search_cp";
+        private const string QQGetLyricUrl = @"https://c.y.qq.com/lyric/fcgi-bin/fcg_query_lyric_new.fcg";
+
+        private const string QQMusicRequestReferer = @"https://y.qq.com/";
 
         public QQLyricDownloader(IWarpHttpClient warpHttpClient,
             ILyricItemCollectionFactory lyricItemCollectionFactory)
@@ -22,15 +31,54 @@ namespace ZonyLrcTools.Cli.Infrastructure.Lyric.QQMusic
 
         protected override async ValueTask<byte[]> DownloadDataAsync(LyricDownloaderArgs args)
         {
-            var searchResult = await _warpHttpClient.PostAsync<SongSearchResponse>(
+            var searchResult = await _warpHttpClient.GetAsync<SongSearchResponse>(
                 QQSearchMusicUrl,
                 new SongSearchRequest(args.SongName, args.Artist));
-            throw new System.NotImplementedException();
+
+            ValidateSongSearchResponse(searchResult, args);
+
+            var lyricJsonString = await _warpHttpClient.GetAsync(QQGetLyricUrl,
+                new GetLyricRequest(searchResult.Data.Song.SongItems.FirstOrDefault()?.SongId),
+                op => op.Headers.Referrer = new Uri(QQMusicRequestReferer));
+
+            return Encoding.UTF8.GetBytes(lyricJsonString);
         }
 
-        protected override ValueTask<LyricItemCollection> GenerateLyricAsync(byte[] data)
+        protected override async ValueTask<LyricItemCollection> GenerateLyricAsync(byte[] data, LyricDownloaderArgs args)
         {
-            throw new System.NotImplementedException();
+            await ValueTask.CompletedTask;
+
+            var lyricJsonString = Encoding.UTF8.GetString(data);
+            lyricJsonString = lyricJsonString.Replace(@"MusicJsonCallback(", string.Empty).TrimEnd(')');
+
+            if (lyricJsonString.Contains("\"code\":-1901"))
+            {
+                throw new ErrorCodeException(ErrorCodes.NoMatchingSong, attachObj: args);
+            }
+
+            if (lyricJsonString.Contains("此歌曲为没有填词的纯音乐，请您欣赏"))
+            {
+                return _lyricItemCollectionFactory.Build(null);
+            }
+
+            var lyricJsonObj = JObject.Parse(lyricJsonString);
+            var sourceLyric = HttpUtility.HtmlDecode(HttpUtility.HtmlDecode(lyricJsonObj.SelectToken("$.lyric").Value<string>()));
+            var translateLyric = HttpUtility.HtmlDecode(HttpUtility.HtmlDecode(lyricJsonObj.SelectToken("$.trans").Value<string>()));
+
+            return _lyricItemCollectionFactory.Build(sourceLyric, translateLyric);
+        }
+
+        protected virtual void ValidateSongSearchResponse(SongSearchResponse response, LyricDownloaderArgs args)
+        {
+            if (response is not {StatusCode: 0} || response.Data.Song.SongItems == null)
+            {
+                throw new ErrorCodeException(ErrorCodes.TheReturnValueIsIllegal, attachObj: args);
+            }
+
+            if (response.Data.Song.SongItems.Count <= 0)
+            {
+                throw new ErrorCodeException(ErrorCodes.NoMatchingSong, attachObj: args);
+            }
         }
     }
 }