move SFTPGo package to the internal folder

SFTPGo is a daemon and command line tool, not a library.

The public API are provided by the SDK

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

internal/httpd/flash.go

@@ -0,0 +1,60 @@
+// Copyright (C) 2019-2022  Nicola Murino
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published
+// by the Free Software Foundation, version 3.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package httpd
+
+import (
+	"encoding/base64"
+	"net/http"
+	"time"
+)
+
+const (
+	flashCookieName = "message"
+)
+
+func setFlashMessage(w http.ResponseWriter, r *http.Request, value string) {
+	http.SetCookie(w, &http.Cookie{
+		Name:     flashCookieName,
+		Value:    base64.URLEncoding.EncodeToString([]byte(value)),
+		Path:     "/",
+		Expires:  time.Now().Add(60 * time.Second),
+		MaxAge:   60,
+		HttpOnly: true,
+		Secure:   isTLS(r),
+		SameSite: http.SameSiteLaxMode,
+	})
+}
+
+func getFlashMessage(w http.ResponseWriter, r *http.Request) string {
+	cookie, err := r.Cookie(flashCookieName)
+	if err != nil {
+		return ""
+	}
+	http.SetCookie(w, &http.Cookie{
+		Name:     flashCookieName,
+		Value:    "",
+		Path:     "/",
+		Expires:  time.Unix(0, 0),
+		MaxAge:   -1,
+		HttpOnly: true,
+		Secure:   isTLS(r),
+		SameSite: http.SameSiteLaxMode,
+	})
+	message, err := base64.URLEncoding.DecodeString(cookie.Value)
+	if err != nil {
+		return ""
+	}
+	return string(message)
+}