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control-plane-api: accept a prefix scope header #3407

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10 changes: 10 additions & 0 deletions crates/control-plane-api/README.md
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Expand Up @@ -6,6 +6,16 @@ capability mask or prefix scope, because the new credential would not preserve
those restrictions. Tenant creation in `server/public/graphql/tenant.rs` also
rejects either restriction before provisioning a tenant.

`Envelope` accepts `X-Estuary-Scope-Prefix: acmeCo/` on authenticated requests.
It narrows the effective claims through the existing `prefix_scope` policy, so
clients can switch tenants using an unscoped bearer without obtaining a new token.
A token already carrying a prefix scope only accepts a matching header (using the
token's trailing-slash normalization); conflicting scopes return HTTP 400 rather
than replacing the token ceiling. Empty, malformed, or repeated headers also
return HTTP 400; a header without authentication returns HTTP 401.
Credential-creation guards apply to header-scoped requests too. No header means
unchanged token behavior. This is request scoping, not persisted credential scope.

## Development

> **NOTE:** All commands below should be run from inside the Lima VM.
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