Direct proxy works

_client/middle.go

@@ -0,0 +1,42 @@
+package client
+
+import (
+	"context"
+	"net"
+
+	"github.com/9seconds/mtg/antireplay"
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/mtproto"
+	"github.com/9seconds/mtg/wrappers"
+)
+
+// MiddleInit initializes client connection for proxy which has to
+// support promoted channels, connect to Telegram middle proxies etc.
+func MiddleInit(ctx context.Context, cancel context.CancelFunc, socket net.Conn,
+	connID string, antiReplayCache antireplay.Cache,
+	conf *config.Config) (wrappers.Wrap, *mtproto.ConnectionOpts, error) {
+	conn, opts, err := DirectInit(ctx, cancel, socket, connID, antiReplayCache, conf)
+	if err != nil {
+		return nil, nil, err
+	}
+	connStream := conn.(wrappers.StreamReadWriteCloser)
+
+	var newConn wrappers.PacketReadWriteCloser
+	switch opts.ConnectionType {
+	case mtproto.ConnectionTypeAbridged:
+		newConn = wrappers.NewMTProtoAbridged(connStream, opts)
+	case mtproto.ConnectionTypeIntermediate:
+		newConn = wrappers.NewMTProtoIntermediate(connStream, opts)
+	case mtproto.ConnectionTypeSecure:
+		newConn = wrappers.NewMTProtoIntermediateSecure(connStream, opts)
+	default:
+		panic("Unknown connection type")
+	}
+
+	opts.ConnectionProto = mtproto.ConnectionProtocolIPv4
+	if socket.LocalAddr().(*net.TCPAddr).IP.To4() == nil {
+		opts.ConnectionProto = mtproto.ConnectionProtocolIPv6
+	}
+
+	return newConn, opts, err
+}