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GET /.well-known/webfinger?resource=acct:user@host lands in
http_server.erl next to the existing /.well-known/sx-capabilities
arm.
Dispatch chain:
route/2 -> dispatch/4 (matches webfinger path) -> handle_webfinger/1
-> webfinger_for_query/2
-> parse_resource_param/1 (matches "resource=" + collect via
take_until_amp/1)
-> discovery:parse_acct/1
-> webfinger_lookup/3 — host check + kernel actor lookup
-> 200 + discovery:webfinger_body/3 (application/activity+json)
-> 404 on any miss
Cfg surface:
{webfinger_host, Binary} optional; when set the acct's @host
must match exactly. Missing -> any.
{kernel, Atom} optional; when set, the user must be
a known actor in the registered kernel.
Missing -> every user is 'known' (pure
route tests).
route/2 already threads the Req's :query into Cfg as
:request_query (Step 4d), so the handler doesn't need to take
the Req directly.
10/10 in next/tests/webfinger_route.sh:
- GET happy path (no kernel cfg'd) -> 200
- body has subject prefix
- body has href substring
- missing ?resource= -> 404
- garbage 'resource=garbage' -> 404
- kernel cfg: alice 200, ghost 404
- :webfinger_host matches @host -> 200
- :webfinger_host mismatch -> 404
- POST -> 404 (only GET handled)
discovery.sh 12/12 unchanged, http_route.sh 11/11 unchanged.