added user.NewAuthToken

util/random.go

@@ -0,0 +1,35 @@
+/*
+ * Amsterdam Web Communities System
+ * Copyright (c) 2025 Erbosoft Metaverse Design Solutions, All Rights Reserved
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+// Package util contains utility definitions.
+package util
+
+import (
+	"crypto/rand"
+	"io"
+)
+
+// authAlphabet is the set of characters from which we generate auth strings.
+const authAlphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz./"
+
+// authStringLen is the standard lengtth of authentication strings.
+const authStringLen = 32
+
+// GenerateRandomAuthString generates a random authentication string.
+func GenerateRandomAuthString() string {
+	b := make([]byte, authStringLen)
+	if _, err := io.ReadFull(rand.Reader, b); err != nil {
+		// can't happen (at least on a modern OS)
+		panic("failed to read random: " + err.Error())
+	}
+	for i := 0; i < authStringLen; i++ {
+		b[i] = authAlphabet[int(b[i])%len(authAlphabet)]
+	}
+	return string(b)
+}