Add using of solidAuth.trackSession() for check, if User is SignedIn already

[smalinin]

Recreate #256 for new sources in master branch

[csarven]

Thanks!

• Can you please rebase to have a single commit? 7cca3b9 does not need to be in the commit history. (Possibly useful: you might want to use https://help.github.com/articles/syncing-a-fork/ and https://help.github.com/articles/configuring-a-remote-for-a-fork/ and to branch off the latest in master for PRs)

• Also, I don't think I understand the issue/improvement. Can you please elaborate? What was not working so well (and how to reproduce) and how this PR resolves that. It is so that I better understand where you are coming from.

[smalinin]

The solid-auth-client that method .trackSession(), that could be used for get state of OIDC session, so we could check, if we LoggedIn already via OIDC(may be in another browser tab with same location.origin or etc).

[csarven]

It sounds like it might resolve potential issues with token expiry (see #257 (comment) and #255 (comment) ) .. What do you think?

[csarven]

I got a chance to look into this.. and solid-auth-client's trackSession doesn't appear to work as this PR intends to. It seems to only "invoke the callback with the current session, and notify you of any changes to the login status." ( https://github.com/solid/solid-auth-client#getting-the-current-user )

I've also noticed that the way trackSession is in place conflicts with the toggling of the user signin/out buttons.

We need to refactor a bit if we want to use trackSession, and I prefer to do that from scratch because the branches are already out of sync

[smalinin]

@csarven Ok, I will rewrite code with new function solid.auth.currentSession

[csarven]

Hang on.. do we actually need it? The toggling works fine. As far as I can see, the session is not shared across tabs/windows.. am I overlooking something?