#45 Referrer check breaks with UTF-8 URLs

admin_options.php

@@ -94,6 +94,15 @@
 	// Make sure base_url doesn't end with a slash
 	if (substr($form['base_url'], -1) == '/')
 		$form['base_url'] = substr($form['base_url'], 0, -1);
+
+	// Convert IDN to Punycode if needed
+	if (preg_match('/[^\x00-\x7F]/', $form['base_url']))
+	{
+		if (!function_exists('idn_to_ascii'))
+			message($lang_admin_options['Base URL problem']);
+		else
+			$form['base_url'] = idn_to_ascii($form['base_url']);
+	} 
 
 	$languages = forum_list_langs();
 	if (!in_array($form['default_lang'], $languages))

lang/English/admin_options.php

@@ -23,6 +23,7 @@
 'Board desc help'					=>	'A short description of this bulletin board (shown at the top of every page). This field may contain HTML.',
 'Base URL label'					=>	'Base URL',
 'Base URL help'						=>	'The complete URL of the board without trailing slash (i.e. http://www.mydomain.com/forums). This <strong>must</strong> be correct in order for all admin and moderator features to work. If you get "Bad referer" errors, it\'s probably incorrect.',
+'Base URL problem'          =>  'Your installation does not support automatic conversion of internationalized domain names. As your base URL contains special characters, you <strong>must</strong> use an online converter in order to avoid "Bad referer" errors.',
 'Timezone label'					=>	'Default time zone',
 'Timezone help'						=>	'The default time zone for guests and users attempting to register for the board.',
 'DST label'							=>	'Adjust for DST',