NeverFiveHundredTests walks every endpoint the server maps and fills each route parameter
with junk ('x', zeroed and random ObjectIds, a dot-dot segment, 5000 characters). It calls
each one anonymously, as a persona, and with a junk token, and asserts that nothing
answers 5xx or throws, and that every /api error carries a Mastodon error body.
It found two bugs:
- A junk 'Authorization: Bearer' on any non-/api route, anonymous ones included
(/build.json, /peasants/*, inboxes), broke the response. JwtEvents.AuthenticationFailed
wrote a body during authentication and the endpoint then wrote its own. The 401 body now
comes from the Challenge event, which runs only when an endpoint needs a user.
- /api answered 401, 404 and 429 with no body. UseMastodonErrorBodies gives any /api error
that leaves without a body Mastodon's {"error": ...}.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ELjqpznMFMNrJoJUj6K5p2
OpenIddict 7.7 (MongoDB stores, keys kept in Mongo so tokens survive
restarts) serves /oauth/authorize, /oauth/token, /oauth/revoke and the
discovery documents, including /.well-known/oauth-authorization-server:
- authorization code (PKCE optional) and client credentials, Mastodon's
scopes including the granular ones, non-expiring reference tokens,
`created_at` in the token response, and the urn:ietf:wg:oauth:2.0:oob
page that shows the code;
- /oauth/login signs the private login into a fifteen-minute cookie that
only /oauth sees (rate limited, antiforgery-protected); /oauth/authorize
then asks which persona the application acts as. The token's subject
is that persona's id and nothing else; no root id reaches a token, an
authorization or a log line;
- the token exchange refuses a persona whose login is banned or deleted,
and every API request checks the same.
/api/v1/apps registers applications dynamically, /api/v1/apps/
verify_credentials, /api/v1/instance (v1 and v2, "4.2.0 (compatible;
PrivaPub)") and verify_credentials answer in Mastodon's shapes: snake_case
with explicit nulls, Rails-style parameters from query, form or JSON,
{"error": ...} on failure, Link paging. CORS exposes Link.
/api goes to OpenIddict validation and everything else to the existing
JWT; the JWT failure handler no longer sends the exception and stack trace
to the client.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB
thepraandClaude Opus 5.5