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Oliver Kieselbach
bffbf35875
Make JWT audience validation accept the primary EntraId:ClientId PLUS an
optional comma/semicolon/space-separated EntraId:AdditionalClientIds. Each
client ID expands to {id} and api://{id}; the set is trimmed, empties dropped,
and de-duplicated case-insensitively (fail-closed on empty input).
This is the seam that lets the API trust a second/rotated app registration
during a future Entra app-reg tenant move: adding a client ID to
EntraId__AdditionalClientIds is the only backend step needed. When the setting
is unset the accepted audiences are exactly the primary id — today's behaviour,
zero change for production.
BuildTokenValidationParameters now takes params string?[] clientIds (backward
compatible), with two pure, unit-tested helpers ResolveConfiguredClientIds and
BuildValidAudiences. +12 tests (multi-audience accept, primary still valid,
foreign audience rejected, parsing/dedupe/fail-closed). 64/64 auth tests green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>