feat: Support REALITY protocol

adapter/outbound/reality.go

@@ -0,0 +1,41 @@
+package outbound
+
+import (
+	"encoding/base64"
+	"encoding/hex"
+	"errors"
+
+	tlsC "github.com/Dreamacro/clash/component/tls"
+
+	"golang.org/x/crypto/curve25519"
+)
+
+type RealityOptions struct {
+	ServerName string `proxy:"server-name"`
+	PublicKey  string `proxy:"public-key"`
+	ShortID    string `proxy:"short-id"`
+}
+
+func (o RealityOptions) Parse() (*tlsC.RealityConfig, error) {
+	if o.PublicKey != "" || o.ServerName != "" {
+		if o.PublicKey != "" && o.ServerName != "" {
+			config := new(tlsC.RealityConfig)
+
+			n, err := base64.RawURLEncoding.Decode(config.PublicKey[:], []byte(o.PublicKey))
+			if err != nil || n != curve25519.ScalarSize {
+				return nil, errors.New("invalid REALITY public key")
+			}
+
+			config.ShortID, err = hex.DecodeString(o.ShortID)
+			if err != nil {
+				return nil, errors.New("invalid REALITY short ID")
+			}
+
+			config.ServerName = o.ServerName
+
+			return config, nil
+		}
+		return nil, errors.New("invalid REALITY protocol option")
+	}
+	return nil, nil
+}