API to conveniently generate secure tokens

tools/utils/secrets/tokens.go

@@ -0,0 +1,42 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package secrets
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/hex"
+	"fmt"
+)
+
+var _ = fmt.Print
+
+const DEFAULT_NUM_OF_BYTES_FOR_TOKEN = 32
+
+func TokenBytes(nbytes ...int) ([]byte, error) {
+	if len(nbytes) == 0 {
+		nbytes = []int{DEFAULT_NUM_OF_BYTES_FOR_TOKEN}
+	}
+	buf := make([]byte, nbytes[0])
+	_, err := rand.Read(buf)
+	if err != nil {
+		return nil, err
+	}
+	return buf, nil
+}
+
+func TokenHex(nbytes ...int) (string, error) {
+	b, err := TokenBytes(nbytes...)
+	if err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(b), nil
+}
+
+func TokenBase64(nbytes ...int) (string, error) {
+	b, err := TokenBytes(nbytes...)
+	if err != nil {
+		return "", err
+	}
+	return base64.StdEncoding.EncodeToString(b), nil
+}