add chain

pkg/components/connector/connector.go

@@ -0,0 +1,11 @@
+package connector
+
+import (
+	"context"
+	"net"
+)
+
+// Connector is responsible for connecting to the destination address.
+type Connector interface {
+	Connect(ctx context.Context, conn net.Conn, network, address string, opts ...ConnectOption) (net.Conn, error)
+}

pkg/components/connector/http/connector.go

@@ -0,0 +1,99 @@
+package http
+
+import (
+	"bufio"
+	"context"
+	"encoding/base64"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"net/url"
+
+	"github.com/go-gost/gost/pkg/components/connector"
+	"github.com/go-gost/gost/pkg/logger"
+)
+
+var (
+	_ connector.Connector = (*Connector)(nil)
+)
+
+type Connector struct {
+	md     metadata
+	logger logger.Logger
+}
+
+func NewConnector(opts ...connector.Option) *Connector {
+	options := &connector.Options{}
+	for _, opt := range opts {
+		opt(options)
+	}
+
+	return &Connector{
+		logger: options.Logger,
+	}
+}
+
+func (c *Connector) Init(md connector.Metadata) (err error) {
+	c.md, err = c.parseMetadata(md)
+	if err != nil {
+		return
+	}
+	return nil
+}
+
+func (c *Connector) Connect(ctx context.Context, conn net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, error) {
+	req := &http.Request{
+		Method:     http.MethodConnect,
+		URL:        &url.URL{Host: address},
+		Host:       address,
+		ProtoMajor: 1,
+		ProtoMinor: 1,
+		Header:     make(http.Header),
+	}
+	if c.md.UserAgent != "" {
+		log.Println(c.md.UserAgent)
+		req.Header.Set("User-Agent", c.md.UserAgent)
+	}
+	req.Header.Set("Proxy-Connection", "keep-alive")
+
+	if user := c.md.User; user != nil {
+		u := user.Username()
+		p, _ := user.Password()
+		req.Header.Set("Proxy-Authorization",
+			"Basic "+base64.StdEncoding.EncodeToString([]byte(u+":"+p)))
+	}
+
+	req = req.WithContext(ctx)
+	if err := req.Write(conn); err != nil {
+		return nil, err
+	}
+
+	resp, err := http.ReadResponse(bufio.NewReader(conn), req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%s", resp.Status)
+	}
+
+	return conn, nil
+}
+
+func (c *Connector) parseMetadata(md connector.Metadata) (m metadata, err error) {
+	if md == nil {
+		md = connector.Metadata{}
+	}
+	m.UserAgent = md[userAgent]
+	if m.UserAgent == "" {
+		m.UserAgent = defaultUserAgent
+	}
+
+	if v, ok := md[username]; ok {
+		m.User = url.UserPassword(v, md[password])
+	}
+
+	return
+}

pkg/components/connector/http/metadata.go

@@ -0,0 +1,18 @@
+package http
+
+import "net/url"
+
+const (
+	userAgent = "userAgent"
+	username  = "username"
+	password  = "password"
+)
+
+const (
+	defaultUserAgent = "Chrome/78.0.3904.106"
+)
+
+type metadata struct {
+	UserAgent string
+	User      *url.Userinfo
+}

pkg/components/connector/metadata.go

@@ -0,0 +1,3 @@
+package connector
+
+type Metadata map[string]string

pkg/components/connector/option.go

@@ -0,0 +1,22 @@
+package connector
+
+import (
+	"github.com/go-gost/gost/pkg/logger"
+)
+
+type Options struct {
+	Logger logger.Logger
+}
+
+type Option func(opts *Options)
+
+func LoggerOption(logger logger.Logger) Option {
+	return func(opts *Options) {
+		opts.Logger = logger
+	}
+}
+
+type ConnectOptions struct {
+}
+
+type ConnectOption func(opts *ConnectOptions)

pkg/components/connector/ss/connector.go

@@ -0,0 +1,54 @@
+package ss
+
+import (
+	"context"
+	"net"
+
+	"github.com/go-gost/gost/pkg/components/connector"
+	"github.com/go-gost/gost/pkg/logger"
+)
+
+var (
+	_ connector.Connector = (*Connector)(nil)
+)
+
+type Connector struct {
+	md     metadata
+	logger logger.Logger
+}
+
+func NewConnector(opts ...connector.Option) *Connector {
+	options := &connector.Options{}
+	for _, opt := range opts {
+		opt(options)
+	}
+
+	return &Connector{
+		logger: options.Logger,
+	}
+}
+
+func (c *Connector) Init(md connector.Metadata) (err error) {
+	c.md, err = c.parseMetadata(md)
+	if err != nil {
+		return
+	}
+
+	return nil
+}
+
+func (c *Connector) Connect(ctx context.Context, conn net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, error) {
+
+	return conn, nil
+}
+
+func (c *Connector) parseMetadata(md connector.Metadata) (m metadata, err error) {
+	if md == nil {
+		md = connector.Metadata{}
+	}
+
+	m.method = md[method]
+	m.password = md[password]
+
+	return
+}

pkg/components/connector/ss/metadata.go

@@ -0,0 +1,11 @@
+package ss
+
+const (
+	method   = "method"
+	password = "password"
+)
+
+type metadata struct {
+	method   string
+	password string
+}