submodule对gitea不管用，所以直接拉了一份拉格兰

Lagrange.Core/Lagrange.OneBot/Utility/MusicSigner.cs

@@ -0,0 +1,77 @@
+using Lagrange.OneBot.Message.Entity;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+using System.Net.Http.Json;
+using System.Text.Json.Nodes;
+
+namespace Lagrange.OneBot.Utility;
+
+public class MusicSigner
+{
+    private static string? _signServer;
+
+    private readonly static HttpClient _client = new();
+
+    public MusicSigner(IConfiguration config, ILogger<MusicSigner> logger)
+    {
+        _signServer = config["MusicSignServerUrl"] ?? "";
+
+        if (string.IsNullOrEmpty(_signServer))
+        {
+            logger.LogWarning("MusicSignServer is not available, sign may be failed");
+        }
+        else
+        {
+            logger.LogInformation("MusicSignServer Service is successfully established");
+        }
+    }
+
+
+    public static string? Sign(MusicSegment musicSegment)
+    {
+        if (string.IsNullOrEmpty(_signServer)) return null;
+
+        JsonObject payload;
+        if (musicSegment.Type != null)
+        {
+            payload = new JsonObject()
+            {
+                { "type" , musicSegment.Type },
+                { "url" , musicSegment.Url },
+                { "audio" , musicSegment.Audio },
+                { "title" , musicSegment.Title },
+                { "image" , musicSegment.Image },
+                { "singer" , musicSegment.Content },
+            };
+        }
+        else
+        {
+            payload = new JsonObject()
+            {
+                { "url" , musicSegment.Url },
+                { "audio" , musicSegment.Audio },
+                { "title" , musicSegment.Title },
+                { "image" , musicSegment.Image },
+                { "singer" , musicSegment.Content },
+                { "appid", ulong.Parse(musicSegment.Appid) },
+                { "sign", musicSegment.Sign },
+                { "package_name", musicSegment.PackageName },
+            };
+        }
+
+        if (musicSegment.Id.Length > 0)
+        {
+            payload.Add("id", musicSegment.Id);
+        }
+
+        try
+        {
+            var message = _client.PostAsJsonAsync(_signServer, payload).Result;
+            return message.Content.ReadAsStringAsync().Result;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+}