fix: add authorization for UI routes

[jescalada]

Fixes #918.

This PR fixes the UI route access issue (unlogged users and non-admins can no longer access any route). In other words, only admins should be able to access the list of users, and only logged-in users can see the rest. Unlogged users can only access the login page.

You'll see an Unauthorized page when accessing a route you don't have access to.

Another issue we'd like to fix is the layout and the admin routes, which are coupled. Thus, all routes are called /admin/* when we only want the actual admin routes to have this naming (and replace regular routes with /dashboard/). To keep things bite-sized, this will be pushed in a separate PR.

It builds on top of the OIDC implementation at #905. As mentioned in that PR, testing with OIDC will require editing the config.

Tests will be modified/added in the layout fix PR since the routes will change.

Thank you!

Changelog

• Added AuthProvider
  • To provide context with the current user
• Added PrivateRoute
  • A wrapper that handles route authorization/redirection
• Added NotAuthorized and NotFound pages
  • To prevent showing blank pages or redirecting (which is confusing)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: jescalada / name: Juan Escalada (516ed7f, 47e95d4, f2c1182, 9e4b9aa, fb1a711, 9e245c1, d049463, 256523f, 12dbbfa, 0c6844f, 0a1c6c2, 893e0b1)
• ✅ login: JamieSlome / name: Jamie Slome (97d3157, c7b18e8)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.65%. Comparing base (484248e) to head (c7b18e8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #917   +/-   ##
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  Coverage   49.65%   49.65%           
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  Files          48       48           
  Lines        1718     1718           
  Branches      175      175           
=======================================
  Hits          853      853           
  Misses        841      841           
  Partials       24       24           

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[JamieSlome]

Thanks for the PR @jescalada and apologies for the delay! From a product perspective, I understand the position of closing down certain routes. My reason for opening them up to all users was to encourage "openness" when engaging with open source, and driving transparency on what projects are being contributed to and by whom. That said, I also appreciate the purpose of this change.

Perhaps we make it configurable?

[jescalada]

@JamieSlome That makes sense! I'll make it optional. I'll modify #961, which contains the changes in this PR.