[Milky] Implement incoming file for group file messages

Author: Wesley-Young

Lagrange.Milky/Entity/Segment/FileSegment.cs

@@ -0,0 +1,26 @@
+using System.Text.Json.Serialization;
+
+namespace Lagrange.Milky.Entity.Segment;
+
+[method: JsonConstructor]
+public class FileIncomingSegment(FileIncomingSegmentData data) : IncomingSegmentBase<FileIncomingSegmentData>(data)
+{
+    public FileIncomingSegment(string fileId, string fileName, long fileSize) : this(new FileIncomingSegmentData(fileId, fileName, fileSize, null)) { }
+
+    public FileIncomingSegment(string fileId, string fileName, long fileSize, string fileHash) : this(new FileIncomingSegmentData(fileId, fileName, fileSize, fileHash)) { }
+}
+
+public class FileIncomingSegmentData(string fileId, string fileName, long fileSize, string? fileHash)
+{
+    [JsonPropertyName("file_id")]
+    public string FileId { get; } = fileId;
+
+    [JsonPropertyName("file_name")]
+    public string FileName { get; } = fileName;
+
+    [JsonPropertyName("file_size")]
+    public long FileSize { get; } = fileSize;
+
+    [JsonPropertyName("file_hash")]
+    public string? FileHash { get; } = fileHash;
+}

Lagrange.Milky/Utility/EntityConvert.Segment.cs

@@ -70,6 +70,7 @@ public async Task<MessageChain> FakeSegmentsAsync(IReadOnlyList<IOutgoingSegment
             (int)video.VideoSize.Y,
             (int)video.VideoLength
         ),
+        GroupFileEntity groupFile => new FileIncomingSegment(groupFile.FileId, groupFile.FileName, groupFile.FileSize),
         MultiMsgEntity multiMsg => new ForwardIncomingSegment(multiMsg.ResId!),
         LightAppEntity lightApp => new LightAppIncomingSegment(lightApp.AppName, lightApp.Payload),
         // ? => new MarketFaceSegment(...),