add http2 transport

pkg/connector/http2/connector.go

@@ -0,0 +1,122 @@
+package http2
+
+import (
+	"context"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"time"
+
+	"github.com/go-gost/gost/pkg/connector"
+	http2_util "github.com/go-gost/gost/pkg/internal/http2"
+	"github.com/go-gost/gost/pkg/logger"
+	md "github.com/go-gost/gost/pkg/metadata"
+	"github.com/go-gost/gost/pkg/registry"
+)
+
+func init() {
+	registry.RegiserConnector("http2", NewConnector)
+}
+
+type http2Connector struct {
+	md     metadata
+	logger logger.Logger
+}
+
+func NewConnector(opts ...connector.Option) connector.Connector {
+	options := &connector.Options{}
+	for _, opt := range opts {
+		opt(options)
+	}
+
+	return &http2Connector{
+		logger: options.Logger,
+	}
+}
+
+func (c *http2Connector) Init(md md.Metadata) (err error) {
+	return c.parseMetadata(md)
+}
+
+func (c *http2Connector) Connect(ctx context.Context, conn net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, error) {
+	c.logger = c.logger.WithFields(map[string]interface{}{
+		"local":   conn.LocalAddr().String(),
+		"remote":  conn.RemoteAddr().String(),
+		"network": network,
+		"address": address,
+	})
+	c.logger.Infof("connect %s/%s", address, network)
+
+	cc, ok := conn.(*http2_util.ClientConn)
+	if !ok {
+		err := errors.New("wrong connection type")
+		c.logger.Error(err)
+		return nil, err
+	}
+
+	pr, pw := io.Pipe()
+	req := &http.Request{
+		Method:        http.MethodConnect,
+		URL:           &url.URL{Scheme: "https", Host: conn.RemoteAddr().String()},
+		Host:          address,
+		ProtoMajor:    2,
+		ProtoMinor:    0,
+		Proto:         "HTTP/2.0",
+		Header:        make(http.Header),
+		Body:          pr,
+		ContentLength: -1,
+	}
+	if c.md.UserAgent != "" {
+		req.Header.Set("User-Agent", c.md.UserAgent)
+	}
+
+	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)))
+	}
+
+	if c.logger.IsLevelEnabled(logger.DebugLevel) {
+		dump, _ := httputil.DumpRequest(req, false)
+		c.logger.Debug(string(dump))
+	}
+
+	if c.md.connectTimeout > 0 {
+		conn.SetDeadline(time.Now().Add(c.md.connectTimeout))
+		defer conn.SetDeadline(time.Time{})
+	}
+
+	resp, err := cc.Client().Do(req.WithContext(ctx))
+	if err != nil {
+		c.logger.Error(err)
+		cc.Close()
+		return nil, err
+	}
+
+	if c.logger.IsLevelEnabled(logger.DebugLevel) {
+		dump, _ := httputil.DumpResponse(resp, false)
+		c.logger.Debug(string(dump))
+	}
+	if resp.StatusCode != http.StatusOK {
+		resp.Body.Close()
+		err = fmt.Errorf("%s", resp.Status)
+		c.logger.Error(err)
+		return nil, err
+	}
+
+	hc := &http2Conn{
+		r:         resp.Body,
+		w:         pw,
+		localAddr: conn.RemoteAddr(),
+	}
+
+	hc.remoteAddr, _ = net.ResolveTCPAddr(network, address)
+
+	return hc, nil
+}