StEP-366: Add OAuth2 support to Stud.IP

Closes #1035 and #1198

Merge request studip/studip!635

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/functions.php b/lib/functions.php
index 0c30bfa..a7f9f3a 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -1873,3 +1873,18 @@ function encodeURI(string $uri): string
     ];
     return strtr(rawurlencode($uri), $replacements);
 }
+
+function randomString(int $length = 32): string
+{
+    $string = '';
+
+    while (($len = strlen($string)) < $length) {
+        $size = $length - $len;
+
+        $bytes = random_bytes($size);
+
+        $string .= substr(str_replace(['/', '+', '='], '', base64_encode($bytes)), 0, $size);
+    }
+
+    return $string;
+}