What does this MR do?
Clients can send the Kerberos username/principal in any case - the
Kerberos server itself does not care. However, GitLab stores
the Kerberos username/principal as extern_uid in a case-sensitive
format. This change uses an iwhere statement rather than
find_by so it doesn't matter how the client send the
username/principal.
Are there points in the code the reviewer needs to double check?
Should we have specs for this? Where? There isn't a clear place to put specs for this helper class.
Why was this MR needed?
It was causing inability to authenticate for a customer in https://gitlab.zendesk.com/agent/tickets/82669
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by UX -
Has been reviewed by Frontend -
Has been reviewed by Backend -
Has been reviewed by Database
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together