The three things core owes the client half before it can leave, all additive,
all MODULE_API 1.2.0 → 1.3.0.
`player.invite.accepted` is the third extension slot. Core's invite page owned a
UO game-account step — it read a `gameAccountSignup` flag out of core's own
settings and posted to a shard route — and an invite is a core concept that
staff receive too, so the page stays and its optional next step becomes a slot.
Named for the place, like the other two. Whether there is a step at all is the
filling module's call, made from data core does not have; core keeps the shell,
the skip control and the destination.
`icon` on a nav item, because without it the six extracted UO rows would have
been the only text-only entries in a sidebar where every other row has a glyph.
Core supplies no fallback — an invented one is core making a presentation choice
for content it knows nothing about. `icon` was already among the fields an
override may not touch, so the concept predates a module being able to send one.
`api.BASE` was in §3.5 from the first draft and never actually published.
`request` is fetch-only, so an EventSource builds its own URL, and the shard's
live feed is two of them; the alternative is a module hardcoding `/api/v1`,
which asserts something about core that core has not promised.
`AcceptInvite` is the one legitimate reader of `extensionFor` outside Slot.jsx:
the answer decides a NAVIGATION, not a decoration. Decoration goes inside
`<Slot wrap>`, which is why `hasExtension` stayed deleted.
Co-Authored-By: Claude <noreply@anthropic.com>
The client twin of the server's declareSlot/registerExtension, and the same rule
in both halves: core declares a slot, only core declares one, and at most one
module fills it. Core renders <Slot name> and gets nothing back when the slot is
unfilled, so an instance with no module installed renders exactly what it
rendered before -- the same untouched-path guarantee withModuleNav makes.
A slot is named for a PLACE, never for a meaning. Core supplies the position and
the styling; the label, the target, the data and whether anything renders at all
are the module's. The moment core types a slot by its content it has re-acquired
the game semantics phase 3 exists to remove.
This is the one place the client registry is not fail-open. An unknown slot, a
non-component and a second fill all throw, matching checkExtensionShape
server-side, because a dropped nav row costs a link the viewer can reach another
way while a silently dropped extension is invisible to everyone including its
author. A throw is always a programming error and never a race: core declares in
its own bundle and every module chunk is a deferred script injected after it.
Reading stays fail-safe -- undeclared and unfilled both read null -- and a
filling component renders inside an error boundary. That asymmetry is where the
client differs from the server: a module route that throws costs the module's own
page, but an extension throws inside CORE's, and the whole reason core keeps
ownership of that page is that it stays usable.
Core decorates a slot through <Slot wrap>, not by asking whether it is filled.
The obvious alternative is right about the unfilled case and wrong about the
failed one -- the extension is filled, so the separator renders, and then the
component throws into the boundary and leaves the separator behind on its own.
wrap puts core's decoration inside the boundary where it shares the extension's
fate. Found in a browser, with the footer's separator, which is the only place
either could have been found.
MODULE_API_VERSION 1.1.0 -> 1.2.0, both halves: the two state ONE version.
Contract: docs/website/MODULE_API.md 3.7.
Co-Authored-By: Claude <noreply@anthropic.com>
Everything the extraction needed from core that ctx did not already offer.
Additions only, so minor.
ctx.activity.log, because an admin action a module performs has to land in
core's one audit log or the trail has a hole exactly where a module operates the
game -- a module keeping its own log would be a second place to look, which in
practice means a place nobody looks. Write-only; reading the log is the admin
panel's job and it spans every actor.
ctx.users.getById, one function for one caller: the admin.users.detail slot
router needs the user its prefix names. ctx.site.baseUrl, because a module has
to build absolute links and §2.7 forbids it reading core's APP_BASE_URL -- a
getter, not a captured string, so it cannot go stale against the env.
ctx.middleware.rateLimit is core's makeLimiter, plus accountChangeLimiter handed
over whole. The split is deliberate: a module states its own window and cap
because it knows what its endpoints cost, and takes the plumbing from core so
there is one express-rate-limit in the process and one place a breach is logged.
accountChangeLimiter is shared policy -- core's /auth/me and /player/account sit
behind the same counter -- so a module's account-change route has to land IN it
rather than beside it. marketLimiter was UO policy living in core's file and
leaves with the route it guards.
registerPostHook is the fourth registry, and the last thing binding core to the
module. Core's post controller called newsGump.syncPost directly: core's CMS
naming a UO file. It now publishes what it already knows and a subscriber
decides what to do with it. Not folded into registerAnnounceLeg, which fires on
the same transition, because a leg is a one-shot DELIVERY with retry and
classification while a post hook maintains idempotent STATE, runs on delete as
well as save, and refreshes silently on an edit.
Also fixes a real loader defect the extraction exposed: schema table names were
matched against the RAW file, so a fragment whose header says "every CREATE
TABLE carries IF NOT EXISTS" was rejected for a prefix violation on a table
called `carries`. module-uo's fragment hit exactly that. Both scans now read
split statements, which strip comments -- the same class of bug as a boundary
check failing on its own documentation.
Co-Authored-By: Claude <noreply@anthropic.com>
Phase 2 PR 2 of docs/website/MODULE_SYSTEM.md 2.7. Adds
server/src/modules/{loader,semver,version}.js: the synchronous scan of
MODULES_DIR, manifest validation, prefix and table-name collision
rejection, per-module try/catch and the mount into the three tier
routers behind the MODULE_API.md 4.5 dispatch guard.
Two decisions the contract left open, both now written up there:
- The load trigger is one explicit modules.load(tierRouters) call in
app.js, not a lazy scan (API 7.6). Accessors throw until it has run,
because "no modules installed" is a real answer a caller must not be
handed by accident.
- Whether core owns a prefix is asked of the live tier routers via
express's own layer.match(), skipping root-mounted layers, rather than
a hardcoded table -- the spike's was already stale when written
(API 4.3).
Mounting is a second pass after every module is validated. Doing it
inside the scan loop makes the first module's layers indistinguishable
from core's, so the second module claiming a taken prefix is told it
collided with core and the module-versus-module check is unreachable.
registerExtension/NotificationStreams/AnnounceLeg and onBoot/onShutdown
throw "not available until phase 2 PR 4/5" rather than no-op; an
accepting stub would let a module believe it had registered something.
No schema replay, no boot dispatch, no installed_modules reconcile --
those are PRs 3 and 5, and until PR 5 a record's state is in memory only.
No module ships on the volume, so nothing an operator or client can see
changes: 842 tests pass, routes.manifest.json is unchanged at 229 routes
and swagger-output.json regenerates byte-identical.
Co-Authored-By: Claude <noreply@anthropic.com>
