Implement permission grants dependent on variable field values

We have a use-case where a field attached to a Relation entity would be required to determine access grants on a particular relation type when using Node Access Relation. How could this be implemented since it is quite variable? Examples of fields attached to a relation type that might determine whether or not node access grants should be enforced might be:

* Active: ignore grants on Inactive or 0 values, enforce grants on Active or 1 values
* Type: grant view to a certain type, view/update to others, view/update/delete to yet others