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<!-- markdownlint-disable MD024 -->
# Capability Spec Delta: api-plugin-site (add-api-plugin-site)
**Package**: `@suaveplan/api-plugin-site`
**Status**: PROPOSED
> Every requirement below carries a `**Verified by:**` line at authoring time.
## ADDED Requirements
### Requirement: Stable SITE.* error registry
The package SHALL register exactly 14 stable error codes under the `"SITE"` namespace via `defineCodes("SITE", [...])`, exporting `SITE_CODES` and `SiteError extends SuaveplanError<SiteErrorCode>`. Every code SHALL be reachable from at least one production code path; deletion to satisfy a coverage gate is forbidden.
#### Scenario: registry declares the 14 canonical codes
- **WHEN** a caller imports `SITE_CODES`
- **THEN** the literal values include `INVALID_OPTIONS`, `SERVICE_NOT_AVAILABLE`, `SITE_NOT_FOUND`, `SITE_LIMIT_EXCEEDED`, `DOMAIN_LIMIT_EXCEEDED`, `DOMAIN_ALREADY_CLAIMED`, `LAST_DOMAIN_REMOVAL`, `DOMAIN_NOT_FOUND`, `INVALID_DOMAIN`, `VALIDATION`, `BOOTSTRAP_FAILED`, `STORAGE_ERROR`, `ROUTE_PREFIX_COLLISION`, `RESOLUTION_FAILED` and every value is namespaced `"SITE.<KEY>"`
#### Scenario: SiteError preserves cause + code
- **WHEN** `new SiteError(SITE_CODES.SITE_NOT_FOUND, "missing", { cause })` is constructed
- **THEN** `error.code === "SITE.SITE_NOT_FOUND"`, `error.siteCode === error.code`, `error.cause === cause`
**Verified by:** `src/error-codes/error-codes.test.ts::"declares all 14 canonical SITE.* codes"` AND `src/error-codes/error-codes.test.ts::"SiteError preserves code, message, cause, and siteCode alias"`
---
### Requirement: Zod-validated plugin-options boundary
The package SHALL expose `SitePluginOptionsSchema` with defaults for every option and SHALL reject non-positive numeric caps and empty `defaultDomainPattern` at Zod parse time. `createSitePlugin` SHALL fail with `SiteError(SITE.INVALID_OPTIONS)` carrying the `ZodError` as `cause` when called with bad input. `DEFAULT_CONFIG` SHALL be frozen.
#### Scenario: defaults applied on empty input
- **WHEN** `SitePluginOptionsSchema.parse({})` is invoked
- **THEN** the result is `{maxSitesPerOrg: 10, maxDomainsPerSite: 5, autoCreateDefaultSite: true, defaultDomainPattern: "{slug}.suaveplan.app", enableDomainResolution: true, enablePushNotifications: true, enableSiteSearch: true, routePrefix: "/api"}`
#### Scenario: invalid options fail with SITE.INVALID_OPTIONS
- **WHEN** `createSitePlugin({ maxSitesPerOrg: -1 } as never)` is invoked
- **THEN** it throws a `SiteError` whose `code === SITE.INVALID_OPTIONS` and whose `cause` is the `ZodError`
**Verified by:** `src/schemas/options.test.ts::"applies all defaults when called with empty input"` AND `src/plugin/plugin.test.ts::"rejects invalid options with SITE.INVALID_OPTIONS"`
---
### Requirement: Site / domain / push Zod schemas
The package SHALL inline the canonical Zod surface for sites, domains, and push configs (`SiteSchema`, `CreateSiteSchema`, `UpdateSiteSchema (.strict)`, `SitePublicInfoSchema`, `SiteIdParamSchema`, `DomainSchema`, `AddDomain*Schema`, `RemoveDomain*Schema`, `DomainResolveParam/ResponseSchema`, `ApplePushConfigSchema`, `FirebasePushConfigSchema`, `PushConfigSchema`, `PushConfigValidationResponseSchema`).
#### Scenario: CreateSiteSchema rejects empty domain list
- **WHEN** `CreateSiteSchema.safeParse({ organization_id, name, domains: [] })`
- **THEN** `result.success === false`
#### Scenario: UpdateSiteSchema rejects unknown keys
- **WHEN** `UpdateSiteSchema.safeParse({ name: "x", sneaky: 1 })`
- **THEN** `result.success === false`
#### Scenario: PushConfigSchema requires at least one provider
- **WHEN** `PushConfigSchema.safeParse({})`
- **THEN** `result.success === false`
**Verified by:** `src/schemas/site.test.ts::"rejects empty domain list"` AND `src/schemas/site.test.ts::"rejects unknown keys via .strict()"` AND `src/schemas/push.test.ts::"requires at least one provider"`
---
### Requirement: Domain canonicalisation parity with database
The package SHALL expose `normalizeDomain(input)` which lower-cases, trims, strips `http(s)://`, strips leading `www.`, and strips a single trailing `/`. The semantics SHALL match the SurrealDB `fn::site::domain::normalize` function so application-tier and database-tier writers agree on the canonical form.
#### Scenario: composed prefix normalisation
- **WHEN** `normalizeDomain("HTTPS://WWW.Acme.Example.Com/")`
- **THEN** result is `"acme.example.com"`
**Verified by:** `src/service/normalize-domain.test.ts::"strips composed prefixes"`
---
### Requirement: DomainResolverService — envelope + observability
`DomainResolverService.resolve(domain)` SHALL return `{success, site?, organization?, error?, code?}`. On hit: `success: true` with `site` + `organization`. On miss: `success: false`, `error: "Domain not found"`, `code: SITE.DOMAIN_NOT_FOUND`. On driver throw: `success: false`, message preserved, `code: SITE.RESOLUTION_FAILED`. Every call SHALL increment `site.domain_resolutions_total{outcome}` and record `site.domain_resolution_duration_ms`. `resolveOrThrow` SHALL throw `SiteError` carrying the same code.
#### Scenario: miss envelope
- **WHEN** the underlying query returns `[]`
- **THEN** `resolve("nope")` returns `{success: false, error: "Domain not found", code: "SITE.DOMAIN_NOT_FOUND"}`
#### Scenario: driver error envelope
- **WHEN** the underlying query throws an `Error`
- **THEN** the returned envelope's `code === "SITE.RESOLUTION_FAILED"` and `error` is the error's message
#### Scenario: resolveOrThrow throws SiteError on miss
- **WHEN** `resolveOrThrow("nope")` runs against an empty result
- **THEN** a `SiteError` with `code === "SITE.DOMAIN_NOT_FOUND"` is thrown
**Verified by:** `src/service/domain-resolver.test.ts::"returns DOMAIN_NOT_FOUND code on empty result"` AND `src/service/domain-resolver.test.ts::"returns RESOLUTION_FAILED code when db throws Error"` AND `src/service/domain-resolver.test.ts::"throws DOMAIN_NOT_FOUND on miss"`
---
### Requirement: SiteService — typed CRUD + cap enforcement + event emission
`SiteService` SHALL expose `create`, `createDefaultSite`, `getById`, `requireById`, `listByOrganization`, `countByOrganization`, `update`, `updateSettings`, `updateState`, `addDomain`, `removeDomain`, `archive`, `getActive`, `search`. `create` SHALL enforce `maxSitesPerOrg` (raises `SITE.SITE_LIMIT_EXCEEDED`) and `maxDomainsPerSite` (raises `SITE.DOMAIN_LIMIT_EXCEEDED`). `addDomain` SHALL persist the new domain (upstream bug fix) and reject duplicates with `SITE.DOMAIN_ALREADY_CLAIMED`. `removeDomain` SHALL refuse to leave the site with zero domains via `SITE.LAST_DOMAIN_REMOVAL`. `updateSettings` SHALL emit `site:settings:updated` natively (no monkey-patching).
#### Scenario: create enforces site cap
- **WHEN** a second `create` runs against an organization already at `maxSitesPerOrg: 1`
- **THEN** a `SiteError(SITE.SITE_LIMIT_EXCEEDED)` is thrown
#### Scenario: addDomain persists new domain
- **WHEN** `addDomain(siteId, "B.Example.Com")` is called against a site with `domains: ["a.example.com"]`
- **THEN** the returned site has `domains: ["a.example.com", "b.example.com"]` AND the underlying row is mutated
#### Scenario: addDomain rejects duplicates
- **WHEN** `addDomain(siteId, "A.Example.Com")` is called against a site already containing `"a.example.com"`
- **THEN** a `SiteError(SITE.DOMAIN_ALREADY_CLAIMED)` is thrown
#### Scenario: removeDomain refuses last
- **WHEN** `removeDomain(siteId, "a.example.com")` is called against a site with one domain
- **THEN** a `SiteError(SITE.LAST_DOMAIN_REMOVAL)` is thrown
#### Scenario: updateSettings emits site:settings:updated
- **WHEN** `updateSettings(siteId, { features: ["beta"] })` succeeds
- **THEN** the injected `EventBusLike` receives a `site:settings:updated` payload with `siteId` and `changedFields: ["features"]`
**Verified by:** `src/service/site.test.ts::"throws SITE_LIMIT_EXCEEDED when over the cap"` AND `src/service/site.test.ts::"addDomain persists the normalized domain"` AND `src/service/site.test.ts::"addDomain throws DOMAIN_ALREADY_CLAIMED on duplicates"` AND `src/service/site.test.ts::"removeDomain refuses LAST_DOMAIN_REMOVAL"` AND `src/service/site.test.ts::"updateSettings merges, persists, and emits site:settings:updated"`
---
### Requirement: Hono middleware factory
`createDomainResolverMiddleware(resolver)` SHALL return a Hono middleware that reads `Host` then `X-Forwarded-Host`, normalises via `normalizeDomain`, and on a hit injects `site` / `organization` / `siteId` / `organizationId` into the request context. On miss or absent host the middleware SHALL fall through silently.
#### Scenario: hit injects four context keys
- **WHEN** a request with `Host: https://www.Example.Com:8080` arrives and the resolver hits
- **THEN** `c.get("siteId")`, `c.get("organizationId")`, `c.get("site")`, and `c.get("organization")` are populated
#### Scenario: empty host falls through
- **WHEN** the middleware is invoked against a context whose `req.header("host")` returns `undefined`
- **THEN** `next()` is called once and no site key is set
**Verified by:** `src/middleware/domain-resolver.test.ts::"injects site + organization on a hit"` AND `src/middleware/domain-resolver.test.ts::"falls through when host header is empty (direct unit call)"`
---
### Requirement: Public + private OpenAPI route trees
`createPublicSiteRoutes` SHALL expose `GET /sites/resolve/{domain}` (returning the resolution envelope) and `GET /sites/{id}/public` (returning the sanitised public projection). `createPrivateSiteRoutes` SHALL expose `POST /sites`, `PATCH /sites/{id}`, `POST /sites/{id}/domains`, `DELETE /sites/{id}/domains`. All bodies SHALL be Zod-validated through `@hono/zod-openapi`.
#### Scenario: domain resolution endpoint returns 200 envelope
- **WHEN** `GET /sites/resolve/example.com` runs and the resolver hits
- **THEN** status is `200` and the body is `{success: true, site, organization}`
#### Scenario: site creation 201
- **WHEN** `POST /sites` runs with a valid body
- **THEN** status is `201` and the body is the created site
#### Scenario: site creation 400 on bad body
- **WHEN** `POST /sites` runs with an empty body
- **THEN** status is `>= 400`
**Verified by:** `src/routes/public-routes.test.ts::"resolves a domain to a site envelope"` AND `src/routes/private-routes.test.ts::"creates a site via POST /sites"` AND `src/routes/private-routes.test.ts::"rejects POST /sites with bad input via Zod 400"`
---
### Requirement: Plugin lifecycle + auto-bootstrap
`createSitePlugin` SHALL produce a `PluginDescriptor` with `name: "site"`, `version: "0.1.0"`, `optionalDependencies: ["database", "auth", "events"]`. `onInit` SHALL resolve `db` from `ServiceRegistry` (raising `SITE.SERVICE_NOT_AVAILABLE` if missing), construct + register `siteService`, `domainResolver`, `domainResolverMiddleware`, optionally subscribe to `organization:created`, and emit `site:initialized`. `onReady` SHALL resolve `app`, detect route-prefix collisions (`SITE.ROUTE_PREFIX_COLLISION`), mount the route trees, and emit `site:ready`. `onClose` SHALL drop the `organization:created` listener.
#### Scenario: missing db raises SERVICE_NOT_AVAILABLE
- **WHEN** `onInit` runs without `db` registered on `ServiceRegistry`
- **THEN** a `SiteError(SITE.SERVICE_NOT_AVAILABLE)` is thrown
#### Scenario: route prefix collision raises ROUTE_PREFIX_COLLISION
- **WHEN** the host `app` already exposes a route under `${routePrefix}/sites/*` and `onReady` runs
- **THEN** a `SiteError(SITE.ROUTE_PREFIX_COLLISION)` is thrown
#### Scenario: organization:created auto-creates default site
- **WHEN** the plugin is constructed with `autoCreateDefaultSite: true` and the event bus emits `organization:created`
- **THEN** the service's underlying store contains a site for that organization id
#### Scenario: createDefaultSite failure emits site:bootstrap:failed
- **WHEN** the organization is already at its site cap and the auto-bootstrap listener fires
- **THEN** the event bus emits `site:bootstrap:failed` with `organizationId`
**Verified by:** `src/plugin/plugin.test.ts::"onInit throws SERVICE_NOT_AVAILABLE when db is missing"` AND `src/plugin/plugin.test.ts::"detects route prefix collisions and throws ROUTE_PREFIX_COLLISION"` AND `src/plugin/plugin.test.ts::"auto-creates a default site on organization:created"` AND `src/plugin/plugin.test.ts::"emits site:bootstrap:failed when createDefaultSite throws"`
---
### Requirement: OTel instrument bundle
The package SHALL expose `getSiteInstruments` returning a lazily-built bundle of five OTel instruments: `sitesCreatedTotal`, `sitesUpdatedTotal`, `domainResolutionsTotal`, `domainResolutionDurationMs`, `bootstrapFailedTotal`. The bundle SHALL be cached at module scope and `resetSiteInstruments` SHALL clear the cache so tests can install a fresh `MeterProvider`.
#### Scenario: instruments cached across calls
- **WHEN** `getSiteInstruments()` is invoked twice in succession without a reset
- **THEN** the second call returns the same object instance as the first
#### Scenario: reset rebinds against a fresh MeterProvider
- **WHEN** a fresh `MeterProvider` is installed and `resetSiteInstruments` is called
- **THEN** the next `getSiteInstruments()` produces a new bundle and `forceFlush` collects metrics from it
**Verified by:** `src/otel/instruments.test.ts::"getSiteInstruments returns a cached bundle"` AND `src/otel/instruments.test.ts::"resetSiteInstruments rebinds against a fresh MeterProvider"`
---
### Requirement: ServiceRegistry augmentation
The package SHALL augment `@suaveplan/api-plugin/service-registry`'s `ServiceRegistry` with three slots — `siteService`, `domainResolver`, `domainResolverMiddleware` — plus the cumulative host slots `app: OpenAPIHono` and `db: SurrealAdapter`. Importing the package barrel SHALL be sufficient to surface the augmentation.
#### Scenario: descriptor lists optional database / auth / events dependencies
- **WHEN** `createSitePlugin()` returns a descriptor
- **THEN** `descriptor.optionalDependencies === ["database", "auth", "events"]`
**Verified by:** `src/plugin/plugin.test.ts::"descriptor name is 'site' and version is '0.1.0'"`
---
### Requirement: Public surface re-exports
The package barrel SHALL re-export the canonical public surface: `SITE_CODES`, `SiteError`, `DEFAULT_CONFIG`, `mergeConfig`, `SiteService`, `DomainResolverService`, `normalizeDomain`, `createDomainResolverMiddleware`, `createPublicSiteRoutes`, `createPrivateSiteRoutes`, `createSitePlugin`, `getSiteInstruments`, `resetSiteInstruments`, `validatePushConfig`, `SiteSchema`, `DomainSchema`, the four `SITE_STATE_*` constants, **and** `MIDDLEWARE_RECOMMENDATIONS` plus the `MiddlewareRecommendation` type.
#### Scenario: re-export surface count
- **WHEN** the spec-conformance test imports every documented symbol from the package barrel
- **THEN** every symbol resolves and the import does not throw
**Verified by:** `src/api-plugin-site.spec-conformance.test.ts::"re-exports every documented symbol"`
---
### Requirement: Middleware composition recommendations
The package SHALL expose `MIDDLEWARE_RECOMMENDATIONS` — a readonly `MiddlewareRecommendation[]` constant describing the recommended rate-limit window, rate-limit ceiling, and audit category per documented site route group (`public:resolve`, `public:read`, `private:write`). The recommendations SHALL be pure data; the site plugin SHALL NOT bind the recommended middleware itself — consumers compose them via the host app's `app.use(prefix, middleware)` Hono pattern. `MiddlewareRecommendation` SHALL be re-exported from the package barrel.
#### Scenario: bundle covers all three route groups
- **WHEN** a caller imports `MIDDLEWARE_RECOMMENDATIONS`
- **THEN** the array contains exactly three entries whose `routeGroup` fields are `"public:resolve"`, `"public:read"`, and `"private:write"`
#### Scenario: private:write carries the tightest limit
- **WHEN** a caller picks the entry where `routeGroup === "private:write"`
- **THEN** its `rateLimit.limit` is strictly less than the entry where `routeGroup === "public:read"` AND its `auditCategory` is `"data.mutation"`
**Verified by:** `src/integration/middleware-recommendations.test.ts::"exposes three route groups"` AND `src/integration/middleware-recommendations.test.ts::"private:write is tightest and audited as data.mutation"`
---
### Requirement: Host-app middleware composition pattern is integration-tested
The package SHALL ship an integration test under `src/integration/middleware-composition.integration.test.ts` that boots a real Hono app composing (a) `createAuditMiddleware` from `@suaveplan/api-plugin-audit` mounted globally, (b) `rateLimit` from `@suaveplan/api-plugin-rate-limit` mounted on the site prefix, and (c) `createPrivateSiteRoutes` from this package mounted under the same prefix. The test SHALL exercise a `POST /sites` write call and SHALL assert that (1) the site row is persisted (site behaviour unchanged by middleware composition), (2) the response carries at least one `X-RateLimit-*` header (rate-limit observed the request), and (3) exactly one `AuditEvent` is recorded in the in-memory audit sink (audit observed the request).
#### Scenario: composed write path preserves site behaviour, surfaces rate-limit headers, and records one audit event
- **WHEN** the composed Hono app receives `POST /sites` with a valid body and a forwarded-for IP header
- **THEN** the response status is `201`, `res.headers.get("X-RateLimit-Limit")` is non-null, and the `MemoryAuditAdapter` snapshot contains exactly one event whose `details.path === "/sites"` and `details.method === "POST"`
**Verified by:** `src/integration/middleware-composition.integration.test.ts::"composes audit + rate-limit + site routes in the documented order"`
---
### Requirement: Package-level integration guide
The package SHALL ship `docs/middleware-integration.md` documenting the canonical Hono `app.use(prefix, middleware)` composition order (audit outermost → rate-limit middle → site routes innermost), the rationale for that order (audit must observe rate-limit denials; rate-limit must precede expensive handlers), and a copy-pasteable end-to-end example covering all three plugins. The README SHALL link to this guide from a "Middleware composition" subsection.
#### Scenario: guide exists and exceeds 200 words
- **WHEN** the docs-check gate inspects `docs/middleware-integration.md`
- **THEN** the file exists, contains the words `app.use`, `audit`, `rate-limit`, and `site`, and exceeds 200 words excluding code blocks
**Verified by:** `src/integration/middleware-recommendations.test.ts::"docs/middleware-integration.md exists and documents the composition order"`
---