[Milky] Partial support for upload_private_file api

Author: NoirHare

Lagrange.Milky/Api/Handler/File/UploadPrivateFileHandler.cs

@@ -0,0 +1,43 @@
+using System.Text.Json.Serialization;
+using Lagrange.Core;
+using Lagrange.Core.Common.Interface;
+using Lagrange.Milky.Utility;
+
+namespace Lagrange.Milky.Api.Handler.File;
+
+[Api("upload_private_file")]
+public class UploadPrivateFileHandler(BotContext bot, ResourceResolver resolver) : IApiHandler<UploadPrivateFileParameter, UploadPrivateFileResult>
+{
+    private readonly BotContext _bot = bot;
+    private readonly ResourceResolver _resolver = resolver;
+
+    public async Task<UploadPrivateFileResult> HandleAsync(UploadPrivateFileParameter parameter, CancellationToken token)
+    {
+        var stream = await _resolver.ToMemoryStreamAsync(parameter.FileUri, token);
+        (int _, _) = await _bot.SendFriendFile(parameter.UserId, stream, parameter.FileName);
+
+        // TODO: The URL cannot be located at this time
+        return new UploadPrivateFileResult(string.Empty);
+    }
+}
+
+public class UploadPrivateFileParameter(long userId, string fileUri, string fileName)
+{
+    [JsonRequired]
+    [JsonPropertyName("user_id")]
+    public long UserId { get; init; } = userId;
+
+    [JsonRequired]
+    [JsonPropertyName("file_uri")]
+    public string FileUri { get; init; } = fileUri;
+
+    [JsonRequired]
+    [JsonPropertyName("file_name")]
+    public string FileName { get; init; } = fileName;
+}
+
+public class UploadPrivateFileResult(string fileId)
+{
+    [JsonPropertyName("file_id")]
+    public string FileId { get; } = fileId;
+}

Lagrange.Milky/Utility/JsonUtility.cs

@@ -76,6 +76,9 @@ public static partial class JsonUtility
     // upload_group_file
     [JsonSerializable(typeof(UploadGroupFileParameter))]
     [JsonSerializable(typeof(UploadGroupFileResult))]
+    // upload_private_file
+    [JsonSerializable(typeof(UploadPrivateFileParameter))]
+    [JsonSerializable(typeof(UploadPrivateFileResult))]
     // get_group_file_download_url
     [JsonSerializable(typeof(GetGroupFileDownloadUrlParameter))]
     [JsonSerializable(typeof(GetGroupFileDownloadUrlResult))]