feat(auth): add role mapping for JWT auth claims

[jescalada]

This PR builds on #967 and adds the possibility of defining mappings for JWT claims into app roles, such as the admin role. This adds flexibility to the API, allowing automated tools to use admin-only endpoints.

It also adds a test suite for the JWT-related additions in both PRs.

Here's a sample apiAuthentication entry in proxy.config.json to understand the structure of the mapping definition. In this case, all users with the claim "name" set to a value of "Juan E" will have their req.user.admin == true:

"apiAuthentication": [
    {
      "type": "jwt",
      "enabled": true,
      "jwtConfig": {
        "clientID": "<my-client-id>",
        "authorityURL": "https://accounts.google.com",
        "roleMapping": {
          "admin": {
            "name": "Juan E"
          }
        }
      }
    }
  ]

Example:

This PR allows assigning arbitrary roles to users for granular JWT auth. For example, the POST /repo/ endpoint requires admin permissions:

router.post('/', async (req, res) => {
  if (req.user && req.user.admin) {
    // Do something
  } else {
    res.status(401).send({
      message: 'You are not authorised to perform this action...',
    });
  }
});

We can map our own provider-specific claim (name), so that only those users whose name matches the configured value (in this case Juan E), will be able to obtain that in-app role (admin). Setting a valid access_token as Bearer token will allow us to get the required req.user.admin:

Note that a valid access token can be obtained following the flow described in #967. This will also require a valid OIDC setup enabled (refer to #906 for a sample OIDC config).

Changelog:

• Add JWT claim to app role mapping functionality
• Make JWT role mappings configurable
  • admin role set by default
• Add unit tests for jwtAuthHandler and jwtUtils files
• Fix minor error handling issues
  • Frontend now shows descriptive messages on users/repos/pushes fetch failure

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[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 12 lines in your changes missing coverage. Please review.

Project coverage is 71.12%. Comparing base (d13686d) to head (9f554b7).

Files with missing lines	Patch %	Lines
src/service/passport/oidc.js	0.00%	6 Missing ⚠️
src/service/routes/repo.js	25.00%	3 Missing ⚠️
src/service/passport/jwtUtils.js	94.44%	2 Missing ⚠️
src/service/passport/jwtAuthHandler.js	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #977      +/-   ##
==========================================
+ Coverage   69.51%   71.12%   +1.61%     
==========================================
  Files          54       55       +1     
  Lines        2227     2244      +17     
  Branches      248      249       +1     
==========================================
+ Hits         1548     1596      +48     
+ Misses        648      618      -30     
+ Partials       31       30       -1     

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[dcoric]

Everything looks good, I just have a small suggestions for Improvement:

Cypress Tests:

• Login Tests: Consider adding a negative test case in login.cy.js to verify error handling for invalid login attempts.

Config Schema:

• Documentation: Enhance the apiAuthentication property with examples or additional documentation to clarify its usage and purpose.

[jescalada]

Confirming that JWT flow works correctly after merge conflict fixes (needed to reconcile OIDC changes):

Confirming that role assignment works correctly too (on admin-only endpoint):

[JamieSlome]

@jescalada - would this be suitable for a minor bump rather than patch bump?

[JamieSlome]

@jescalada - I also see some files changed that seem unrelated to this improvement/feature? I've reviewed the PR otherwise, and happy to merge once this and the previous comment are addressed 👍

[jescalada]

Hi @JamieSlome, pardon the delay! This PR would need a minor bump, since it pretty much counts as an extra feature for the JWT auth.

I modified some of the src/ui files to display an error message in case the JWT is active (which makes the frontend API calls fail). Ideally, this would be solved by adding a form/prompt to set the token in the frontend, but I think this might be overkill to add right now unless someone specifically asks for it. I also improved the error handling so that users can see the error from the backend instead of just "Something went wrong...". Most of the other stuff is just refactoring/cleaning up the early JWT implementation.

Other than that, I added a doc page and E2E test based on @dcoric's review.