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fix(oauth): preserve existing refresh_token when refresh response omits it - #2271
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Fixes #2270
Per RFC 6749 Section 6, the authorization server MAY issue a new refresh token in the refresh response. When it doesn't,
_handle_refresh_responseoverwrites the stored token as-is, discarding the existingrefresh_token. After the first successful refresh,can_refresh_token()returnsFalseand subsequent refreshes fail.This preserves the existing
refresh_tokenwhen the response omits one, usingmodel_copy(update=...).Also removes
# pragma: no coverfrom_handle_refresh_response(added in a bulk coverage baseline, not intentional) and adds tests covering all branches: success with preservation, success with rotation, no prior tokens, non-200 failure, and invalid JSON.Note: #2270 hasn't received the
ready for worklabel yet. Submitting this early since the fix is small and self-contained. Happy to wait or adjust based on maintainer feedback.