Aaron Coburn commented on VCL-497:
What do you mean by duplicates? Do you mean multiple values?
eppn (eduPersonPrincipalName) is always supposed to be a single, scoped value.
It is also supposed to be globally unique. See here for details:
eduPersonScopedAffiliation can have multiple values, but that is different.
In any case, $_SERVER['eppn'] is always supposed to be in this form: user@domain
> dedup eppn
> Key: VCL-497
> URL: https://issues.apache.org/jira/browse/VCL-497
> Project: VCL
> Issue Type: Improvement
> Components: web gui (frontend)
> Reporter: Josh Thompson
> Fix For: 2.4
> The Shibboleth spec allows the eppn to contain duplicates. The code needs to
> be updated to handle multiples as well as duplicates in those multiples.
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