This littl' lib helps me to check if a user has access to something (aka. user-rights). I created this lib to make my life a bit easier when working with user and rights.
Probably this is not useful for anybody else, but how knows?
If you have an application with users they probably have different access levels oder rights, right? I prefer a hierarchic user-level approach. Every user-right is a string with 0..n 'dots'. Every dot in the string represents a hierarchy level. The more dots, the lower is the right in the hierarchy.
A user is granted access to a resource, if he has the exact required right or any other higher hierarchy right.
Let's look at an example:
userA has the following rights: ['some', 'foo.bar']
userB has the following rights: ['other', 'foo.bar.wat']
Assume we have the following resources:
resourceA which requires: ['some']
resourceB which requires: ['foo.bar.wat']
resourceC which requires: ['foo']
Who can access what?
userA can access resourceA and resourceB, but not resourceC
userA has access to resourceA, because she has exactly matching right (some) that is required for the resource.
She can access resourceB, because she has a right that is higher in the hierarchy than the right that is required to access the resource (has: foo.bar, required: foo.bar.wat)
userA cannot access resourceC, because she only has a right that is lower in the hierarchy than the right the resource requires.
userB can only access resourceC. I think you now know why, right?
There are some basic unit tests. You can run them yourself like this:
npm install
npm test