The Admin-003 fix gated every SignalR hub with [Authorize], but the server-side
Blazor HubConnection clients had no way to authenticate: the browser's HttpOnly
auth cookie is not reachable from the interactive circuit, so every hub negotiate
returned 401 and the Admin live-update feature was non-functional app-wide
(silently degraded on Hosts/ScriptLog, fatal on the cluster pages).
Introduce a token-based hub auth path:
- HubTokenService mints/validates short-lived tokens using ASP.NET Core Data
Protection (the same primitive that protects the auth cookie — no signing-key
management, no new packages). Tokens carry the user's name + roles.
- HubTokenAuthenticationHandler is a custom "HubToken" auth scheme that reads the
token from the Authorization: Bearer header (negotiate) or the access_token
query parameter (WebSocket upgrade).
- The "HubClients" authorization policy runs both the cookie and HubToken
schemes; the hub endpoints use RequireAuthorization("HubClients").
- AdminHubConnectionFactory builds hub connections with an AccessTokenProvider
that mints a fresh token for the circuit's authenticated user on every
(re)connect. All six hub-consuming pages now resolve connections through it.
Hub negotiate now returns 200 and the WebSocket upgrades (101); live updates
work. The best-effort try/catch guards added previously are kept as defence.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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