Detect if a user is not part of a class for a specific source about nb

[karger]

Unclear what you mean here. If the student is not logged in, then we don't know who they are and therefore we can't know which classes they are in. If the student is logged in, then we know that they do not have this source in their class but it isn't clear that's an error. I might visit all sorts of random pages that use NB for classes I'm not in. It isn't an error for me to visit those pages. We might want to provide some kind of brief informational popup saying this page is in an NB course in which you are not enrolled, but I think it should fade away pretty fast.

[JumanaFM]

That’s correct, David. The way NB works is that sources are part of classes. The current logic is that annotations are stored if they are on a source that is part of a class. When a user tries to use NB when it’s not part of the system, the client plug-in looks like it’s working, however it sends a CORS error and doesn’t store any information. The other case is when an NB user tries to access a source that is added to NB, but is not part of their classes, the plug-in will allow them to annotate without storing their session nor prompting them to do anything. If we want to allow a user to annotate on a source that is not part of a class then we have to change the logic of nb and add a use case for personal use (personal class maybe?) for the MVP and to avoid confusing students and have their annotations lost when they access a wrong URL, we provide a message to alert them. Does that clarify the issue?