Added auth servicers to pkg

pkg/http/auth/basic.go

@@ -0,0 +1,40 @@
+package auth
+
+import (
+	"context"
+	"encoding/base64"
+	"fmt"
+)
+
+type (
+	ServicerBasic struct {
+		user string
+		pass string
+	}
+
+	BasicParams struct {
+		User string
+		Pass string
+	}
+)
+
+func NewBasic(p BasicParams) (s ServicerBasic, err error) {
+	if p.User == "" {
+		err = fmt.Errorf("invalid param username")
+		return
+	}
+
+	if p.Pass == "" {
+		err = fmt.Errorf("invalid param password")
+		return
+	}
+
+	s = ServicerBasic{user: p.User, pass: p.Pass}
+
+	return
+}
+
+func (s ServicerBasic) Do(ctx context.Context) string {
+	auth := s.user + ":" + s.pass
+	return base64.StdEncoding.EncodeToString([]byte(auth))
+}