added ProxyProtocolPipelineFilterFactory

src/SuperSocket.ProtoBase/Extensions.cs

@@ -2,6 +2,7 @@
 using System.Buffers;
 using System.Text;
 using System.Buffers.Text;
+using SuperSocket.ProtoBase.ProxyProtocol;
 
 namespace SuperSocket.ProtoBase
 {
@@ -147,5 +148,11 @@ public static int Write(this IBufferWriter<byte> writer, ReadOnlySpan<char> text
 
             return totalBytes;
         }
+
+        public static IPipelineFilterFactory<TPackageInfo> UseProxyProtocol<TPackageInfo>(this IPipelineFilterFactory<TPackageInfo> pipelineFilterFactory)
+            where TPackageInfo : class
+        {
+            return new ProxyProtocolPipelineFilterFactory<TPackageInfo>(pipelineFilterFactory);
+        }
     }
 }

src/SuperSocket.ProtoBase/ProxyProtocol/ProxyProtocolPipelineFilterFactory.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Buffers;
+
+namespace SuperSocket.ProtoBase.ProxyProtocol
+{
+    public class ProxyProtocolPipelineFilterFactory<TPackageInfo> : IPipelineFilterFactory<TPackageInfo>
+        where TPackageInfo : class
+    {
+        private readonly IPipelineFilterFactory<TPackageInfo> _pipelineFilterFactory;
+
+        public ProxyProtocolPipelineFilterFactory(IPipelineFilterFactory<TPackageInfo> pipelineFilterFactory)
+        {
+            _pipelineFilterFactory = pipelineFilterFactory;
+        }
+
+        public IPipelineFilter<TPackageInfo> Create(object client)
+        {
+            return new ProxyProtocolPipelineFilter<TPackageInfo>(_pipelineFilterFactory.Create(client));
+        }
+    }
+}