Chore: make the code more semantic

component/vmess/vmess.go

@@ -0,0 +1,117 @@
+package vmess
+
+import (
+	"crypto/tls"
+	"fmt"
+	"math/rand"
+	"net"
+	"runtime"
+
+	"github.com/gofrs/uuid"
+)
+
+// Version of vmess
+const Version byte = 1
+
+// Request Options
+const (
+	OptionChunkStream  byte = 1
+	OptionChunkMasking byte = 4
+)
+
+// Security type vmess
+type Security = byte
+
+// Cipher types
+const (
+	SecurityAES128GCM        Security = 3
+	SecurityCHACHA20POLY1305 Security = 4
+	SecurityNone             Security = 5
+)
+
+// CipherMapping return
+var CipherMapping = map[string]byte{
+	"none":              SecurityNone,
+	"aes-128-gcm":       SecurityAES128GCM,
+	"chacha20-poly1305": SecurityCHACHA20POLY1305,
+}
+
+var tlsConfig = &tls.Config{
+	InsecureSkipVerify: true,
+}
+
+// Command types
+const (
+	CommandTCP byte = 1
+	CommandUDP byte = 2
+)
+
+// Addr types
+const (
+	AtypIPv4       byte = 1
+	AtypDomainName byte = 2
+	AtypIPv6       byte = 3
+)
+
+// DstAddr store destination address
+type DstAddr struct {
+	AddrType byte
+	Addr     []byte
+	Port     uint
+}
+
+// Client is vmess connection generator
+type Client struct {
+	user     []*ID
+	uuid     *uuid.UUID
+	security Security
+	tls      bool
+}
+
+// Config of vmess
+type Config struct {
+	UUID     string
+	AlterID  uint16
+	Security string
+	TLS      bool
+}
+
+// New return a Conn with net.Conn and DstAddr
+func (c *Client) New(conn net.Conn, dst *DstAddr) net.Conn {
+	r := rand.Intn(len(c.user))
+	if c.tls {
+		conn = tls.Client(conn, tlsConfig)
+	}
+	return newConn(conn, c.user[r], dst, c.security)
+}
+
+// NewClient return Client instance
+func NewClient(config Config) (*Client, error) {
+	uid, err := uuid.FromString(config.UUID)
+	if err != nil {
+		return nil, err
+	}
+
+	var security Security
+	switch config.Security {
+	case "aes-128-gcm":
+		security = SecurityAES128GCM
+	case "chacha20-poly1305":
+		security = SecurityCHACHA20POLY1305
+	case "none":
+		security = SecurityNone
+	case "auto":
+		security = SecurityCHACHA20POLY1305
+		if runtime.GOARCH == "amd64" || runtime.GOARCH == "s390x" || runtime.GOARCH == "arm64" {
+			security = SecurityAES128GCM
+		}
+	default:
+		return nil, fmt.Errorf("Unknown security type: %s", config.Security)
+	}
+	return &Client{
+		user:     newAlterIDs(newID(&uid), config.AlterID),
+		uuid:     &uid,
+		security: security,
+		tls:      config.TLS,
+	}, nil
+}