simplesamlphp / simplesamlphp/simplesamlphp-module-oidc

are_multiple_claim_values_allowed controls all claims in a scope

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PHP
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Description

If I set are_multiple_claim_values_allowed to true in a custom scope eduperson, which I need for eduperson_affiliation, eduperson_principal_name also becomes a list even if it contains only one value (and is defined as single-valued).
Maybe the are_multiple_claim_values_allowed setting should live at the claim definition level instead of scope?

Or: Always send single valued claims as string and expand to list if are_multiple_claim_values_allowed is set to true at the scope level, this would be the least intrusive refactor. But the downside is that this behaviour would be unpredictable for the RP.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by tracing how the are_multiple_claim_values_allowed setting is applied to claims within a scope, focusing on eduperson_affiliation and eduperson_principal_name. Compare the current behavior with the proposed claim-level and scope-level alternatives. Done means the project has an agreed, predictable rule for single-valued and multi-valued claims, covered by relevant tests.

Written by the indexing model from the issue text.

Assessment

Tech stack
php
Domain
authentication
Issue type
Bug
Difficulty
5/5
Estimated time
Over a week
Activity status
Active
Clarity
Needs clarification
Newbie friendliness
35/100

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