Hello Everyone is there a way to check if the user is logged in when accessing a suitelet? or would you recommend a RESTlet for this?

users who can access the internal url of a suitelet are logged in

Yes but the idea is the the suitelet is available without loggin and check if they already are logged in, if they are not we'll show a credential form as a result and after they log in redirect them to a custom solution. If they are logged in redirect them with no credentials needed

the check is opening the internal url, in a window (or iframe) and seeing if you actually get your suitelet's content or a login screen

@battk Could they make a request to the internal URL and parse the response, perhaps using a different method e.g. POST and potentially a parameter. The response should be JSON if logged in, an HTML form if not?

cors is unlikely to allow you to make a post

GET then, maybe with a specific parameter to return a different response than the sign-in page.

if you are making a distinction between get or post, you are probably suggesting an xhr or fetch, both of which will likely fail at cors

@battk Oh, yep, you're right. I'd forgotten about them serving from different domains.