WIP: Include principal field to opa payload #25895
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Description
The PR is about including principal information to OPA payload
Additional context and related issues
My use case is for Metabase x Trino integration and its impersonation mode. If the mode is enabled, Trino acknowledges queries are fired by a specific email from users. The problem arises when there are multiple impersonation Metabase connections; the underlying OPA cannot differentiate which connection a user is using to apply connection-level constraints. Hence, including a principal field (similar to authenticatedUser in resource group selector) can help forward necessary information to OPA to know which Trino user is actually impersonating a Metabase user.
Release notes
( ) This is not user-visible or is docs only, and no release notes are required.
( ) Release notes are required. Please propose a release note for me.
(x) Release notes are required, with the following suggested text:
Include
principal
information to OPA's context identity