Access Control in JavaScript

ZAC is a practical lightweight library for access control in JavaScript based on aspect orientation. Its access control architecture is stack based, similar to those of Java and C#. However, ZAC integrates other features for more expressive access control. First, access control policies can be enforced at the level of objects, which permits more fine-grained control over resource access. Second, policies in ZAC can base their decisions on scripts´ execution history. This lets developers express policies that are impossible to define using other models, such as bounded-time execution.