added key value shorthand

commons-auth-adapter/src/main/java/io/rocketbase/commons/security/CommonsPrincipal.java

@@ -27,6 +27,18 @@ public static CommonsPrincipal getCurrent() {
         return null;
     }
 
+    /**
+     * @return the value of the given key when user is logged in and key exists<br>
+     * key is stored internally in lowercase so that this function also lowers the given key...
+     */
+    public String getCurrentKeyValue(String key) {
+        CommonsPrincipal current = getCurrent();
+        if (current != null) {
+            return current.getKeyValues() != null ? current.getKeyValues().getOrDefault(key.toLowerCase(), null) : null;
+        }
+        return null;
+    }
+
     @Override
     public String getName() {
         return getUsername();