Implement random password generation (create/edit account)

src/Common/PasswordHelper.php

@@ -24,4 +24,20 @@ class PasswordHelper
         $passwordHashInfo = password_get_info($passwordHash);
         return $passwordHashInfo['algoName'] ?? 'unknown';
     }
+
+    public function generateRandomPassword(int $length = 24): string
+    {
+        // We want a random string of alphanumeric characters. Simple way to do this is to get random bytes, convert them to base64,
+        // strip all characters from it that aren't alphanumeric (+, /, =), and take the first $length characters from it.
+
+        // Get lots of random bytes (will be much more than we need, but this way we don't need to worry about the string being too short
+        // after stripping the non-alphanumeric base64 characters).
+        $randomBytes = random_bytes(2 * $length);
+
+        // Convert to base64 and strip non-alphanumeric characters
+        $randomAlphaNumeric = str_replace(['+', '/', '='], '', base64_encode($randomBytes));
+
+        // Shorten string
+        return substr($randomAlphaNumeric, 0, $length);
+    }
 }