add obfs dialer

pkg/dialer/obfs/http/metadata.go

@@ -0,0 +1,29 @@
+package http
+
+import (
+	"fmt"
+
+	md "github.com/go-gost/gost/pkg/metadata"
+)
+
+type metadata struct {
+	host    string
+	headers map[string]string
+}
+
+func (d *obfsHTTPDialer) parseMetadata(md md.Metadata) (err error) {
+	const (
+		headers = "headers"
+		host    = "host"
+	)
+
+	if mm, _ := md.Get(headers).(map[interface{}]interface{}); len(mm) > 0 {
+		m := make(map[string]string)
+		for k, v := range mm {
+			m[fmt.Sprintf("%v", k)] = fmt.Sprintf("%v", v)
+		}
+		d.md.headers = m
+	}
+	d.md.host = md.GetString(host)
+	return
+}