Chore: split component to transport

transport/ssr/obfs/obfs.go

@@ -0,0 +1,42 @@
+package obfs
+
+import (
+	"errors"
+	"fmt"
+	"net"
+)
+
+var (
+	errTLS12TicketAuthIncorrectMagicNumber = errors.New("tls1.2_ticket_auth incorrect magic number")
+	errTLS12TicketAuthTooShortData         = errors.New("tls1.2_ticket_auth too short data")
+	errTLS12TicketAuthHMACError            = errors.New("tls1.2_ticket_auth hmac verifying failed")
+)
+
+type authData struct {
+	clientID [32]byte
+}
+
+type Obfs interface {
+	StreamConn(net.Conn) net.Conn
+}
+
+type obfsCreator func(b *Base) Obfs
+
+var obfsList = make(map[string]struct {
+	overhead int
+	new      obfsCreator
+})
+
+func register(name string, c obfsCreator, o int) {
+	obfsList[name] = struct {
+		overhead int
+		new      obfsCreator
+	}{overhead: o, new: c}
+}
+
+func PickObfs(name string, b *Base) (Obfs, int, error) {
+	if choice, ok := obfsList[name]; ok {
+		return choice.new(b), choice.overhead, nil
+	}
+	return nil, 0, fmt.Errorf("Obfs %s not supported", name)
+}