add http2 transport

pkg/connector/http2/metadata.go

@@ -0,0 +1,44 @@
+package http2
+
+import (
+	"net/url"
+	"strings"
+	"time"
+
+	md "github.com/go-gost/gost/pkg/metadata"
+)
+
+const (
+	defaultUserAgent = "Chrome/78.0.3904.106"
+)
+
+type metadata struct {
+	connectTimeout time.Duration
+	UserAgent      string
+	User           *url.Userinfo
+}
+
+func (c *http2Connector) parseMetadata(md md.Metadata) (err error) {
+	const (
+		connectTimeout = "timeout"
+		userAgent      = "userAgent"
+		user           = "user"
+	)
+
+	c.md.connectTimeout = md.GetDuration(connectTimeout)
+	c.md.UserAgent, _ = md.Get(userAgent).(string)
+	if c.md.UserAgent == "" {
+		c.md.UserAgent = defaultUserAgent
+	}
+
+	if v := md.GetString(user); v != "" {
+		ss := strings.SplitN(v, ":", 2)
+		if len(ss) == 1 {
+			c.md.User = url.User(ss[0])
+		} else {
+			c.md.User = url.UserPassword(ss[0], ss[1])
+		}
+	}
+
+	return
+}