rails_list_filtering_sample_app VS gitcloud

There's an interesting section here about one of my favourite challenges in authorization: how to efficiently return a list of things that the current user has permission to access, without running a "can_access()" permission check on every single one of them (which is bad if you have thousands of items and you want to paginate them).

Their solution is to let you configure rules that get turned into SQL fragments that you can run against your own database: https://www.osohq.com/docs/guides/integrate/filter-lists#lis... - example Rails app here: https://github.com/osohq/rails_list_filtering_sample_app

> However: you seem to target developers. Why do you force me to leave my IDE and use your "rules editor"? Can I not write all those things in my IDE, with all the support it brings, and integrate this into my CICD flow? (yes, there is the .polar file, but why force me to jump through hoops?)

Hey valenterry! Oso CTO here. You can absolutely write policies locally and integrate this with CI/CD. We have vscode extension for the former, and CI tools for running local dev environments and CI for running this locally or in CI or whatever.

The UI is mostly nice for getting started development experience, e.g. it integrates directly with Oso Cloud without needing to configure credentials.

> Then, why did you create a new DSL and not a merely a (de-)serializable datastructure (which will indeed look like a dsl)? One, that is powerful enough to represent the capabilities you need. Then, I could in fact use any language (library) of my choice and create the rules from this language, which just has to create the datastructure.

We have a post on this coming soon! The short version is that Polar is a logic language based on Prolog/Datalog/miniKanren. And logic languages are a particularly good fit for representing the branching conditional logic you often see in authorization configurations.

And it made it easier for us to do custom work like add inline policy tests.

> Apart from that, I really like the `yes, if` idea! Would be nice to hear a bit more about that (unfortunately, the article pretty much ends there). Such as: how to deal with actions that change things and can (or must) potentially be run before the authorization is completed and such.

We typically recommend authorizing in two places: at the start of a request, and then when fetching data.

e.g. in our demo app, authorizing "can a user create an issue" involves authorizing a "create_issue" action against the repository itself: https://github.com/osohq/gitcloud/blob/sam/list-filtering/se...

Whereas anything listing issues calls the `list_local` method and does the `yes, if` style approach.