Add tests using PHPUnit

Tests generated by Junie AI. Might not have the best possible quality
but at least we got something, and if it turns out to be complete
rubbish, we can just throw it out again without any issues, as this is
independent of the actual code base.

1 files changed, 7 insertions, 1 deletions

diff --git a/inc/util.inc.php b/inc/util.inc.php
index 003da9fa..9fc1320c 100644
--- a/inc/util.inc.php
+++ b/inc/util.inc.php
@@ -130,8 +130,14 @@ class Util
 		return Dictionary::number((float)$bytes, $decimals) . "\xe2\x80\x89" . ($sz[$factor + $shift] ?? '#>PiB#');
 	}
 
+	/**
+	 * Make sure given string is a valid filename, by replacing sequences of non-ASCII/printable
+	 * characters by underscore.
+	 */
 	public static function sanitizeFilename(string $name): string
 	{
+		if (empty($name))
+			return '_';
 		return preg_replace('/[^a-zA-Z0-9_\-]+/', '_', $name);
 	}
 
@@ -491,7 +497,7 @@ class Util
 		if (!Property::get('webinterface.redirect-domain') || empty(Property::get('webinterface.https-domains')))
 			return null; // Disabled, or unknown domain
 		$curDomain = $_SERVER['HTTP_HOST'];
-		if ($curDomain[-1] === '.') {
+		while ($curDomain[-1] === '.') {
 			$curDomain = substr($curDomain, 0, -1);
 		}
 		$domains = explode(' ', Property::get('webinterface.https-domains'));