# Phase 10.1: Runtime admin extension point - Context

**Gathered:** 2026-09-28
**Status:** Ready for planning

<domain>
## Phase Boundary

Phase 10.1 opens the compiled admin SPA so a plugin can extend lists and forms without a Node rebuild: per-controller JS/CSS (Winter `addJs`/`addCss`), `type: widget` as custom elements (no Vue in plugins), `type: partial` via `html/template` (form fields and a list-header slot), and extra named toolbar actions.

Acceptance is three real Albums surfaces in `fonoteka.go`, plus a nameless fixture plugin in `summercms.go` for contract tests:

1. A statistics strip above the Albums list (list chrome, declared in `config_list.yaml`, not a fake form field).
2. A `type: widget` on the Albums form that renders a “load from Discogs” button. The click POSTs to a stub; Phase 14 replaces the stub with the real Discogs client. The stub may return a fixture payload that patches YAML-declared `fill` fields so write-back is proven now.
3. A third Albums toolbar action (named, registered on the controller) that POSTs to its own stub and toasts.

Not in scope: the real Discogs HTTP client and jobs (Phase 14); WASM (FW-06 / v2); a dev-mode disk override for plugin assets; Ctrl+K, badge columns, Playwright, user/media navigation (Phase 10 deferred, unchanged).

</domain>

<decisions>
## Implementation Decisions

### Acceptance
- **D-01:** Prove the phase on Płytarium Albums, not a toy-only milestone: stats strip on the Albums list, Discogs widget on the Albums form, one extra Albums toolbar button. A nameless fixture plugin in `summercms.go` still covers the framework contract (no Płytarium names in the framework repo).
- **D-02:** The Discogs widget button is enabled in this phase. Click hits a stub endpoint that returns a clear not-implemented or fixture payload. Phase 14 replaces the stub. Do not implement the Discogs client here.
- **D-03:** The statistics strip is list chrome above `DataTable`, not `type: partial` in `fields.yaml`. Form `type: partial` is still in this phase (boot must allow it); Płytarium may not have a form partial yet — the fixture plugin (or a tiny unused field) proves that path.

### Widget contract
- **D-04:** Plugins ship plain JS custom elements. No Vue SFC, no Vue compiler, no import of admin SPA modules. App developers never need Node (Phase 10 D-04 stands).
- **D-05:** The SPA owns HTTP. The widget dispatches a `CustomEvent`; `FieldRenderer` POSTs to the YAML-declared action with the existing cookie and `X-Requested-With` CSRF header. Widget JS must not `fetch` the admin API and must not read the JWT cookie. — **Reversibility:** costly — every widget and the CSRF matrix assume this split.
- **D-06:** `fields.yaml` uses Winter-shaped `type: widget` plus a small key set: custom-element tag/path, POST `action`, and `fill: [keys]` for write-back. Unknown keys fail boot (`DisallowUnknownField`). — **Reversibility:** costly — every ported `fields.yaml` that uses a widget writes this shape.
- **D-07:** On success the SPA patches only the `fill` keys onto the form model. Phase 10.1 may return a fixture payload so the save path is real; Phase 14 returns Discogs values into the same keys.
- **D-08:** The SPA mounts the custom element with `record-id`, field name, locale, and a snapshot of the current `fill` values. No Vue instance, no token, no cookie on the element.

### Partials and toolbar
- **D-09:** Both surfaces ship: list-header partials and form `type: partial`. Phase 9’s boot error for `type: partial` is lifted for a supported partial contract. `type: widget` is added to the allowed form types.
- **D-10:** Partials render with `html/template` against a **curated view model** the controller supplies. The template must not receive a raw GORM model or the request. `html/template` escaping stays on; record fields are not trusted HTML.
- **D-11:** The Albums stats strip is declared in `config_list.yaml` (e.g. `headerPartial:` naming the template). The controller implements the view-model method. Missing template or unknown YAML key fails boot.
- **D-12:** Custom toolbar actions extend the D-14 string list: `toolbar.buttons: [create, delete, discogsSync]`. Unknown names fail boot unless the controller registers that action (label, permission, POST path). Click: SPA POSTs with CSRF, stub returns, toast. `create`/`delete` behavior is unchanged. — **Reversibility:** costly — list YAML and the toolbar compiler grow a registration table.

### Assets, serving, CSP
- **D-13:** Controllers declare JS/CSS with a Go method (Winter `addJs`/`addCss`). `pact.AdminAssets` remains the YAML `embed.FS` — the JS/CSS interface gets a different name (planner). Files live in the plugin embed tree.
- **D-14:** Assets load when that controller opens (list or form). Other plugins’ admin JS stay unloaded.
- **D-15:** Production and dev both serve from `embed.FS`. No disk-override switch in v1. `air` / `summer watch` rebuilds the binary. — **Reversibility:** reversible
- **D-16:** Files are served under the admin prefix, same origin as the SPA, e.g. `{backend.uri}/assets/{vendor}/{plugin}/…`. CSP stays `script-src 'self'`: no `unsafe-inline`, no extra script hosts. Cookie stays HttpOnly, Secure, SameSite=Strict (Phase 10 D-19). — **Reversibility:** costly — CSP hygiene gate and cookie threat model (T-10-01, T-10-16) assume this.

### Hygiene constraint (partial HTML in the SPA)
- **D-17:** Phase 10 forbids unsanitized `v-html` / `innerHTML` (T-10-16, `--hygiene`). Partial HTML still has to appear in the list/form. Researcher/planner must pick a host that does not reopen that threat (dedicated sanitized slot, iframe under the admin prefix, or equivalent). Record data must not become executable HTML.

### Claude's Discretion
- Exact YAML key names (`headerPartial` vs another spelling, widget `path` vs `tag`, action path convention).
- JS/CSS capability interface name (must not reuse `pact.AdminAssets`).
- Stub JSON envelope, toast copy, and the fixture `fill` payload for the Discogs widget.
- Which numbers the Albums stats strip shows (counts the controller already has vs a small new query).
- How the form `type: partial` proof is wired if fonoteka has no real form partial (fixture plugin field vs a harmless unused Albums field).
- Custom-element tag naming and `customElements.define` timing relative to asset load.
- Whether the Discogs widget renders on create, update, or both (record-id may be empty on create).
- Exact asset URL layout under `{backend.uri}/assets/`.
- Partial-host implementation that satisfies D-17.
- Whether the third toolbar action is named `discogsSync` or something else; label/permission strings.

### Reviewed Todos
- Backend admin personal API tokens (deferred Apparatus PersonalApiToken) — keyword-only match on “admin”; not this phase.

</decisions>

<canonical_refs>
## Canonical References

**Downstream agents MUST read these before planning or implementing.**

### Phase 10 contract this phase extends
- `.planning/phases/10-admin-vue-spa/10-CONTEXT.md` — D-04 (embed, no Node for app plugins), D-05 (`FieldRenderer` seam), D-14 (`toolbar.buttons` create/delete only; custom actions were deferred here), D-19 (httpOnly cookie because plugin JS will run same-origin). Deferred section named this phase.
- `.planning/phases/10-admin-vue-spa/10-RESEARCH.md` — original 10.1 note: `AdminAssets()` / `addJs`/`addCss`, custom elements, `type: partial`, custom toolbar, disk switch (disk switch was rejected in this discussion).
- `.planning/phases/10-admin-vue-spa/10-SECURITY-REVIEW.md` — T-10-01 (cookie, no token in JS), T-10-16 (no raw HTML), T-10-SC (lockfile), CSP `script-src 'self'`.
- `.planning/phases/10-admin-vue-spa/design/README.md` — `UnsupportedField`, list toolbar, form field chrome the new types must fit.

### Phase 9 schema pipeline (must change)
- `.planning/phases/09-backend-admin-authentication-and-schema-pipeline/09-CONTEXT.md` — D-06 allowed types; D-15 `type: partial` is a boot error (Collections editors became `relation-manager`).
- `cabana/form_schema.go` — `formFieldTypes`, explicit reject of `type: partial`, unknown types fail boot.
- `cabana/list_schema.go` — `toolbar.buttons` compiler (create/delete only; Winter string is a boot error).
- `pact/capabilities.go` — `AdminAssets` is the YAML `fs.FS`, not JS/CSS.

### SPA extension seam
- `admin/src/components/form/registry.ts` — `rendererFor` / `UnsupportedField`; comment already points at Phase 10.1.
- `admin/src/components/form/FieldRenderer.vue` — mounts the selected control.
- `admin/src/components/list/ListToolbar.vue` — renders declared button names.
- `admin/src/views/ListView.vue` — splits `create` vs toolbar buttons; insertion point for the list-header partial.

### Project constraints
- `.planning/ROADMAP.md` §Phase 10.1 — inserted after Phase 10; depends on Phase 10.
- `.planning/REQUIREMENTS.md` — ADMIN-01..06 (ADMIN-06 complete). Planning should add an ADMIN-07 (or equivalent) for this extension point; do not silently reuse ADMIN-06.
- `.planning/PROJECT.md` — compiled plugins only; two-repo split; WASM deferred (`.planning/seeds/wasm-extension-api.md`).
- `.planning/research/STACK.md` — stdlib `html/template`; no new Go dependency unless a phase decision names it.

### Later phase that owns Discogs
- `.planning/ROADMAP.md` §Phase 14 — Discogs client, CSV/Discogs jobs. Replaces the 10.1 stubs.

### PHP reference (read-only)
- `/media/nvme/dev/golem15/fonoteka/plugins/golem15/fonoteka/controllers/` — Winter `addJs`/`addCss` and any remaining partials (editors is already `relation-manager` in Go).
- `../fonoteka.go/plugins/golem15/fonoteka/controllers/albums/` — Go Albums YAML this phase will edit.

</canonical_refs>

<code_context>
## Existing Code Insights

### Reusable Assets
- `FieldRenderer` + `registry.ts`: register `widget` and `partial` renderers; unknown types still fall back to `UnsupportedField`.
- `cabana` form/list compilers: extend allowed types and toolbar action names; keep `DisallowUnknownField` and boot-fail behavior.
- `boardwalk` / admin prefix serving: same-origin static files under `{backend.uri}` already exist for the SPA `dist/`.
- Cookie + CSRF (`X-Requested-With`) on unsafe admin routes: widget and toolbar POSTs must reuse this, not invent a second auth.
- `phrasebook` / `messages:`: toolbar label and toasts should be phrase keys, not hardcoded Polish in the SPA.
- Plugin `embed.FS` (`pact.AdminAssets.AdminFS()`): YAML today; JS/CSS/templates should live in the same plugin tree or a sibling embed.

### Established Patterns
- Fail-loud boot on unknown YAML keys and unsupported types.
- Framework stays app-agnostic: fixture plugin in `summercms.go`, Albums proof in `fonoteka.go`.
- Committed `dist/` + drift check: a new built-in field host (widget/partial chrome) needs a Node rebuild; plugin JS does not.
- Optional capability interfaces type-asserted by the consumer (Phase 9/10 hooks).

### Integration Points
- Lift `type: partial` / add `type: widget` in `cabana/form_schema.go`; extend `toolbarButtons` in `cabana/list_schema.go`.
- New admin routes for widget action + toolbar action stubs, permission-gated like other Albums writes.
- SPA: widget control, partial host (D-17), list-header slot in `ListView`, toolbar renderer for registered extra actions.
- Asset routes under `{backend.uri}/assets/...`, loaded when Albums navigation/controller is active.
- `fonoteka.go` Albums controller: view model for stats, widget + toolbar stub handlers, `addJs`/`addCss`, YAML edits.
- OpenAPI: new action paths must be typed in the framework admin document (Phase 10 D-15); no hand-maintained TS types.

</code_context>

<specifics>
## Specific Ideas

- The user asked for a **statistics partial above the Albums list** as the real Płytarium proof, then a **custom widget in `fields.yaml`** that is a button to load data from Discogs. It is allowed to be a stub until full Discogs support (Phase 14); the point is that widgets render on forms.
- “Above the list” was explicitly distinguished from `type: partial` in `fields.yaml`.
- Winter `addJs`/`addCss` is the mental model for the Go method; plugins remain compiled and embedded.

</specifics>

<deferred>
## Deferred Ideas

- **Phase 14:** Real Discogs client, jobs, and non-stub widget/toolbar payloads.
- **Dev-mode disk override** for plugin JS/CSS — considered and rejected for v1 (embed only).
- **WASM sandboxed extension API** — FW-06 / v2; not a substitute for this compiled-plugin extension point.
- Phase 10 leftovers, still out of scope: Ctrl+K command palette, badge/icon column type, Playwright admin e2e, user/media admin navigation.

### Reviewed Todos (not folded)
- Backend admin personal API tokens (deferred Apparatus PersonalApiToken) — matched only on the word “admin”; belongs with admin auth follow-up, not the SPA extension point.

</deferred>

---

*Phase: 10.1-runtime-admin-extension-point*
*Context gathered: 2026-09-28*