重構

Downloader/LyricsDownloader.cs

@@ -0,0 +1,100 @@
+using Lyrics.Models;
+using NeteaseCloudMusicApi;
+using Newtonsoft.Json.Linq;
+using System.Text.RegularExpressions;
+
+namespace Lyrics.Downloader;
+
+public class LyricsDownloader
+{
+    private readonly CloudMusicApi _cloudMusicApi;
+
+    public LyricsDownloader(CloudMusicApi cloudMusicApi)
+    {
+        _cloudMusicApi = cloudMusicApi;
+    }
+
+    public async Task DownloadLyricAndWriteFileAsync(int songId)
+    {
+        if (songId <= 0)
+        {
+            throw new ArgumentException("SongId invalid.", nameof(songId));
+        }
+
+        // Find local .lrc file.
+        if (File.Exists($"Lyrics/{songId}.lrc"))
+        {
+            Console.WriteLine($"Lyric file {songId}.lrc already exists.");
+            return;
+        }
+
+        await Task.Delay(TimeSpan.FromMilliseconds(new Random().Next(500, 1500)));
+
+        // Download lyric by id at Netease Cloud Music.
+        string? lyricString = await GetLyricAsync(songId);
+
+        if (string.IsNullOrEmpty(lyricString))
+        {
+            throw new Exception("Can't find lyric.");
+        }
+
+        if (lyricString.Contains("纯音乐，请欣赏")
+            // 沒有時間資訊
+            || !Regex.IsMatch(lyricString, @"\[\d{2}:\d{2}.\d{1,5}\]")
+            // 小於6行
+            || lyricString.Split('\n').Length < 6)
+        {
+            throw new Exception("Found an invalid lyric.");
+        }
+
+        await File.WriteAllTextAsync($"Lyrics/{songId}.lrc", lyricString, System.Text.Encoding.UTF8);
+        Console.WriteLine($"Write new lyric file {songId}.lrc.");
+    }
+
+    public async Task<(int songId, string songName)> GetSongIdAsync(ISong song, int offset = 0)
+    {
+        if (string.IsNullOrEmpty(song.Title))
+        {
+            throw new ArgumentException("Song Title invalid");
+        }
+
+        (bool isOk, JObject json) = await _cloudMusicApi.RequestAsync(CloudMusicApiProviders.Search,
+                                                                      new Dictionary<string, object> {
+                                                                         { "keywords", song.Title},
+                                                                         { "type", 1 },
+                                                                         { "limit", 1 },
+                                                                         { "offset", offset }
+                                                                      });
+        if (!isOk || null == json)
+        {
+            Console.Error.WriteLine($"API response ${json?["code"] ?? "error"} while getting song id.");
+            return default;
+        }
+
+        json = (JObject)json["result"];
+        return null == json
+               || json["songs"] is not IEnumerable<JToken> result
+               ? default
+               : result.Select(t => ((int)t["id"], (string)t["name"]))
+                       .FirstOrDefault();
+    }
+
+    public async Task<string?> GetLyricAsync(int songId)
+    {
+        (bool isOk, JObject json) = await _cloudMusicApi.RequestAsync(CloudMusicApiProviders.Lyric,
+                                                                      new Dictionary<string, object> {
+                                                                        { "id", songId }
+                                                                      });
+        if (!isOk || null == json)
+        {
+            Console.Error.WriteLine($"API response ${json?["code"] ?? "error"} while getting lyric.");
+            return null;
+        }
+
+        return (bool?)json["uncollected"] != true
+               && (bool?)json["nolyric"] != true
+               ? json["lrc"]["lyric"].ToString().Trim()
+               : null;
+    }
+
+}

Lyrics.csproj

@@ -8,12 +8,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <Compile Remove="Playlists\AutoGenerator\AutoGenerator\**" />
-    <Compile Remove="Playlists\QuonTama\CreateRadioQTamaSubtitles\**" />
-    <EmbeddedResource Remove="Playlists\AutoGenerator\AutoGenerator\**" />
-    <EmbeddedResource Remove="Playlists\QuonTama\CreateRadioQTamaSubtitles\**" />
-    <None Remove="Playlists\AutoGenerator\AutoGenerator\**" />
-    <None Remove="Playlists\QuonTama\CreateRadioQTamaSubtitles\**" />
+    <Compile Remove="Playlists\**" />
+    <EmbeddedResource Remove="Playlists\**" />
+    <None Remove="Playlists\**" />
   </ItemGroup>
 
   <ItemGroup>