[Core] Add Build-only Grey

Lagrange.Core/Internal/Packets/Message/Component/Extra/GreyTipExtra.cs

@@ -0,0 +1,23 @@
+using ProtoBuf;
+
+namespace Lagrange.Core.Internal.Packets.Message.Component.Extra;
+
+[ProtoContract]
+internal class GreyTipExtra
+{
+    [ProtoMember(101)] public GreyTipExtraLayer1? Layer1 { get; set; }
+}
+
+[ProtoContract]
+internal class GreyTipExtraLayer1
+{
+    [ProtoMember(1)] public GreyTipExtraInfo? Info { get; set; }
+}
+
+[ProtoContract]
+internal class GreyTipExtraInfo
+{
+    [ProtoMember(1)] public uint Type { get; set; } // 1
+
+    [ProtoMember(2)] public string Content { get; set; } = string.Empty; // "{\"gray_tip\":\"谨防兼职刷单、游戏交易、投资荐股、色情招嫖、仿冒公检法及客服人员的网络骗局，如有资金往来请谨慎操作。 \",\"object_type\":3,\"sub_type\":2,\"type\":4}"
+}

Lagrange.Core/Message/Entity/GreyTipEntity.cs

@@ -0,0 +1,68 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Lagrange.Core.Internal.Packets.Message.Component.Extra;
+using Lagrange.Core.Internal.Packets.Message.Element;
+using Lagrange.Core.Internal.Packets.Message.Element.Implementation;
+using Lagrange.Core.Utility.Extension;
+
+namespace Lagrange.Core.Message.Entity;
+
+public class GreyTipEntity : IMessageEntity
+{
+    public string GreyTip { get; }
+
+    public GreyTipEntity(string greyTip) => GreyTip = greyTip;
+
+    public GreyTipEntity() => GreyTip = string.Empty;
+
+    IEnumerable<Elem> IMessageEntity.PackElement()
+    {
+        var content = new GreyTipContent
+        {
+            GrayTip = GreyTip,
+            ObjectType = 3,
+            SubType = 2,
+            Type = 4
+        };
+
+        var extra = new GreyTipExtra
+        {
+            Layer1 = new GreyTipExtraLayer1
+            {
+                Info = new GreyTipExtraInfo { Content =  JsonSerializer.Serialize(content), Type = 1 }
+            }
+        };
+
+        return new Elem[]
+        {
+            new()
+            {
+                GeneralFlags = new GeneralFlags
+                {
+                    PbReserve = extra.Serialize().ToArray(),
+                }
+            }
+        };
+    }
+
+    IMessageEntity? IMessageEntity.UnpackElement(Elem elem)
+    {
+        throw new NotImplementedException();
+    }
+
+    public string ToPreviewString()
+    {
+        throw new NotImplementedException();
+    }
+
+    private class GreyTipContent
+    {
+        [JsonPropertyName("gray_tip")] public string GrayTip { get; set; } = string.Empty;
+
+        [JsonPropertyName("object_type")] public uint ObjectType { get; set; }
+
+        [JsonPropertyName("sub_type")] public uint SubType { get; set; }
+
+        [JsonPropertyName("type")] public uint Type { get; set; }
+    }
+}

Lagrange.Core/Message/MessageBuilder.cs

@@ -353,6 +353,14 @@ public MessageBuilder MarketFace(string faceId, int tabId, string key, string su
         return this;
     }
 
+    public MessageBuilder GeryTip(string greyTip)
+    {
+        var greyTipEntity = new GreyTipEntity(greyTip);
+        _chain.Add(greyTipEntity);
+
+        return this;
+    }
+
     public MessageBuilder Add(IMessageEntity entity)
     {
         _chain.Add(entity);