The server half of the central-hosted pull-only secrets hub. SecretsHubService
adapts the node's own ISecretStore onto secrets_hub.v1 using exactly two read
members (GetManifestAsync, GetAsync) — the proto exposes no write RPC, so a
follower has no path to put a row into central whatever its credentials allow.
GetSecrets omits a name the hub does not hold and skips one that will not parse
as a SecretName; neither is an error, because both describe a follower acting on
a manifest that was true a moment ago. Failing the call would stall the sweep and
let one bad name deny the follower every other row in the batch. Names are
re-validated server-side (the wire type is a plain string) and de-duplicated on
the normalized value.
DomainToWire mirrors the Akka replicator's SecretRowDto discipline exactly:
round-trip "O" timestamps so a DateTimeOffset's offset and ticks survive the
last-writer-wins equality compare, the content type as its enum MEMBER NAME so an
unknown value is rejected rather than decoded to the zero member, and nullable
fields left absent rather than written as "" so null and empty stay distinct.
SecretsHubAuthInterceptor fails closed: with no token configured every call is
denied and one warning names the exact configuration key — never a token value,
presented or configured, at any level. Denial is uniform (one Status, one detail,
no "why") so a caller gets no oracle. Comparison is constant-time over UTF-8
bytes. All four handler shapes are gated, not just unary, so a future RPC cannot
arrive unauthenticated by omission; more than one Authorization header is refused
as a smuggling shape. The type keeps EXACTLY ONE public constructor — Grpc's
activator silently stops invoking an interceptor it cannot construct
unambiguously, and the failure mode is an auth gate that quietly does not run — so
a test pins the count.
Tests: 50, red-first (compile-red, then a fail-closed mutation verified 5 of them
bite). Full Secrets suite 328 passed / 0 failed / 15 live-gated skips, 0 new
warnings.
Claude-Session: https://claude.ai/code/session_014WNM4vjoVksyyBraTXSZE1
Joseph Doherty
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