[Core & Milky] Implement accept_group_invitation action

Lagrange.Core/Common/Entity/BotGroupNotificationType.cs

@@ -3,6 +3,7 @@ namespace Lagrange.Core.Common.Entity;
 public enum BotGroupNotificationType
 {
     Join = 1,
+    InviteSelf = 2,
     SetAdmin = 3,
     KickOther = 6,
     KickSelf = 7,

Lagrange.Core/Common/Interface/MessageExt.cs

@@ -58,4 +58,7 @@ public static Task GroupRename(this BotContext context, long groupUin, string na
 
     public static Task GroupQuit(this BotContext context, long groupUin)
         => context.EventContext.GetLogic<OperationLogic>().GroupQuit(groupUin);
+
+    public static Task SetGroupInviteSelfAccept(this BotContext context, long groupUin, long sequence)
+        => context.EventContext.GetLogic<OperationLogic>().SetGroupInviteSelfAccept(groupUin, sequence);
 }

Lagrange.Core/Internal/Logic/OperationLogic.cs

@@ -54,6 +54,11 @@ public async Task GroupMemberRename(long groupUin, long targetUin, string name)
         await context.EventContext.SendEvent<GroupMemberRenameEventResp>(new GroupMemberRenameEventReq(groupUin, uid, name));
     }
 
+    public async Task SetGroupInviteSelfAccept(long groupUin, long sequence)
+    {
+        await context.EventContext.SendEvent<SetGroupNotificationEventReq>(new SetGroupNotificationEventReq(groupUin, (ulong)sequence, BotGroupNotificationType.InviteSelf, GroupNotificationOperate.Allow, String.Empty));
+    }
+
     public async Task GroupQuit(long groupUin)
     {
         await context.EventContext.SendEvent<GroupQuitEventResp>(new GroupQuitEventReq(groupUin));

Lagrange.Milky/Api/Handler/Request/AcceptGroupInvitationRequestHandler.cs

@@ -0,0 +1,27 @@
+using System.Text.Json.Serialization;
+using Lagrange.Core;
+using Lagrange.Core.Common.Interface;
+
+namespace Lagrange.Milky.Api.Handler.Request;
+
+[Api("accept_group_invitation")]
+public class AcceptGroupInvitationRequestHandler(BotContext bot) : IEmptyResultApiHandler<AcceptGroupInvitationRequestParameter>
+{
+    private readonly BotContext _bot = bot;
+
+    public async Task HandleAsync(AcceptGroupInvitationRequestParameter parameter, CancellationToken token)
+    {
+        await _bot.SetGroupInviteSelfAccept(parameter.GroupId, parameter.InvitationSeq);
+    }
+}
+
+public class AcceptGroupInvitationRequestParameter(long groupId, long invitationSeq)
+{
+    [JsonRequired]
+    [JsonPropertyName("group_id")]
+    public long GroupId { get; } = groupId;
+
+    [JsonRequired]
+    [JsonPropertyName("invitation_seq")]
+    public long InvitationSeq { get; } = invitationSeq;
+}

Lagrange.Milky/Utility/JsonUtility.cs

@@ -6,6 +6,7 @@
 using Lagrange.Milky.Api.Handler.Friend;
 using Lagrange.Milky.Api.Handler.Group;
 using Lagrange.Milky.Api.Handler.Message;
+using Lagrange.Milky.Api.Handler.Request;
 using Lagrange.Milky.Api.Handler.System;
 using Lagrange.Milky.Api.Result;
 using Lagrange.Milky.Entity.Event;
@@ -83,6 +84,8 @@ public static partial class JsonUtility
     [JsonSerializable(typeof(SetGroupMemberSpecialTitleParameter))]
     // quit_group
     [JsonSerializable(typeof(QuitGroupParameter))]
+    // accept_group_invitation
+    [JsonSerializable(typeof(AcceptGroupInvitationRequestParameter))]
     // == file ==
     // upload_group_file
     [JsonSerializable(typeof(UploadGroupFileParameter))]