From 3bce00440e8cab7f5c1c00f12a52ab8ccc271017 Mon Sep 17 00:00:00 2001
From: Aadhavan Srinivasan <aadhavan@twomorecents.org>
Date: Wed, 6 Sep 2023 22:00:23 -0500
Subject: [PATCH] Added random string generation functions to a separate file

---
 rand_string.inc.php | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 rand_string.inc.php

diff --git a/rand_string.inc.php b/rand_string.inc.php
new file mode 100644
index 0000000..7e3fc89
--- /dev/null
+++ b/rand_string.inc.php
@@ -0,0 +1,29 @@
+<?php
+
+function gen_rand_shortlink($len) {
+        $to_return = '';
+        $possible_chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+        while (mb_strlen($to_return) < $len) {
+                $to_return = $to_return . $possible_chars[rand(0, mb_strlen($possible_chars)-1)];
+        }
+
+        return $to_return;
+
+}
+
+function gen_base62_rand_shortlink($len) {
+        $rand_bytes = random_bytes(intval(($len * 2) / 3));
+        $rand_string = base64_encode($rand_bytes);
+        $rand_string = str_replace("+","",$rand_string);
+        $rand_string = str_replace("/","",$rand_string);
+        $rand_string = str_replace("=","",$rand_string);
+
+        if (mb_strlen($rand_string) < $len) {
+                $curlen = mb_strlen($rand_string);
+                $rand_string = $rand_string . gen_rand_shortlink($len - $curlen);
+        }
+
+        return $rand_string;
+}
+
+?>