1 files changed, 41 insertions, 0 deletions
diff --git a/library/Nagvis/RestrictionHelper.php b/library/Nagvis/RestrictionHelper.php
new file mode 100644
index 0000000..a757b9d
--- /dev/null
+++ b/library/Nagvis/RestrictionHelper.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace Icinga\Module\Nagvis;
+
+use Icinga\Authentication\Auth;
+
+/**
+ * NagVis restriction helper
+ */
+class RestrictionHelper
+{
+    /**
+     * Get the regular expression for validating map names
+     *
+     * @return  string|null
+     */
+    public static function getRegex()
+    {
+        $mapFilters = array();
+        foreach (Auth::getInstance()->getRestrictions('nagvis/map/filter') as $mapFilter) {
+            if ($mapFilter !== '') {
+                $mapFilters = array_merge($mapFilters, array_map('trim', explode(',', $mapFilter)));
+            }
+        }
+
+        if (! empty($mapFilters)) {
+            $mapRegexParts = array();
+            foreach (array_unique($mapFilters) as $mapFilter) {
+                $nonWildcards = array();
+                foreach (explode('*', $mapFilter) as $nonWildcard) {
+                    $nonWildcards[] = preg_quote($nonWildcard, '/');
+                }
+                $mapRegexParts[] = implode('.*', $nonWildcards);
+            }
+
+            return '/^(?:' . implode('|', $mapRegexParts) . ')$/i';
+        }
+
+        return null;
+    }
+}