[OneBot] Implemented set_group_leave API

Lagrange.OneBot/Core/Entity/Action/OneBotSetGroupLeave.cs

@@ -0,0 +1,11 @@
+using System.Text.Json.Serialization;
+
+namespace Lagrange.OneBot.Core.Entity.Action;
+
+[Serializable]
+public class OneBotSetGroupLeave
+{
+    [JsonPropertyName("group_id")] public uint GroupId { get; set; }
+    
+    [JsonPropertyName("is_dismiss")] public bool IsDismiss { get; set; }
+}

Lagrange.OneBot/Core/Operation/Group/SetGroupLeaveOperation.cs

@@ -0,0 +1,24 @@
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using Lagrange.Core;
+using Lagrange.Core.Common.Interface.Api;
+using Lagrange.OneBot.Core.Entity.Action;
+
+namespace Lagrange.OneBot.Core.Operation.Group;
+
+[Operation("set_group_leave")]
+public class SetGroupLeaveOperation : IOperation
+{
+    public async Task<OneBotResult> HandleOperation(string echo, BotContext context, JsonObject? payload)
+    {
+        var message = payload.Deserialize<OneBotSetGroupLeave>();
+
+        if (message != null)
+        {
+            bool _ = await context.LeaveGroup(message.GroupId); // TODO: Figure out is_dismiss
+            return new OneBotResult(null, 0, "ok", echo);
+        }
+
+        throw new Exception();
+    }
+}

README.md

@@ -116,7 +116,7 @@ Please use Lagrange.Core responsibly and in accordance with the law.
 | [/set_group_anonymous]     |    🔴   |
 | [/set_group_card]          |     🟢  |
 | [/set_group_name]          |    🟢   |
-| [/set_group_leave]         |    🔴   |
+| [/set_group_leave]         |    🟢   |
 | [/set_group_special_title] |    🔴   |
 | [/set_friend_add_request]  |    🔴   |
 | [/set_group_add_request]   |    🔴   |