separate ssu from ss

pkg/connector/ss/udp/metadata.go

@@ -0,0 +1,49 @@
+package ss
+
+import (
+	"time"
+
+	"github.com/go-gost/gost/pkg/common/util/ss"
+	md "github.com/go-gost/gost/pkg/metadata"
+	"github.com/shadowsocks/go-shadowsocks2/core"
+)
+
+type metadata struct {
+	cipher         core.Cipher
+	connectTimeout time.Duration
+	udpBufferSize  int
+}
+
+func (c *ssuConnector) parseMetadata(md md.Metadata) (err error) {
+	const (
+		method         = "method"
+		password       = "password"
+		key            = "key"
+		connectTimeout = "timeout"
+		udpBufferSize  = "udpBufferSize" // udp buffer size
+	)
+
+	c.md.cipher, err = ss.ShadowCipher(
+		md.GetString(method),
+		md.GetString(password),
+		md.GetString(key),
+	)
+	if err != nil {
+		return
+	}
+
+	c.md.connectTimeout = md.GetDuration(connectTimeout)
+
+	if c.md.udpBufferSize > 0 {
+		if c.md.udpBufferSize < 512 {
+			c.md.udpBufferSize = 512
+		}
+		if c.md.udpBufferSize > 65*1024 {
+			c.md.udpBufferSize = 65 * 1024
+		}
+	} else {
+		c.md.udpBufferSize = 4096
+	}
+
+	return
+}