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kandev/docs/plans/plugins/task-08-proxies.md
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João Salavisa e145d48f22 feat: add plugin system with grpc runtime and native ui plugins (#1742) 
* feat: add plugin system with grpc runtime and native ui plugins

- go plugin backends ship as release tarballs (per-platform binaries, checksums) that
  kandev installs from url/upload or filesystem sideload+sync, then spawns and
  supervises via hashicorp/go-plugin (unix socket / loopback tcp+automtls)
- strict typed grpc contract (kandev.plugin.v1): DeliverEvent/InvokeTool/HandleWebhook
  plus a capability-gated host service (state, secrets, emit); author sdk in
  pkg/pluginsdk; packaging cli in cmd/plugin-pack
- native frontend bundles: window.registerKandevPlugin + registry/host loader with
  dynamic routes, nav items, slots and ws handlers; plugins settings page with
  install dialog, sync button and enable/disable/uninstall
- gated behind the plugins feature flag (prod off, dev/e2e on); covered by unit and
  integration tests plus playwright e2e against a real packaged fixture plugin

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(plugins): hydrate base app context on plugin routes

Plugin-owned SPA routes classify as RouteUnknown, so the boot payload shipped
only feature flags — no workspaces, workflows, or kanban context. Native plugin
UI (e.g. host.ui.TaskCreateDialog) then had an empty store. Hydrate the same
base context as the Home route for unknown SPA routes.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* feat(plugins): expose TaskCreateDialog on host.ui

Lets a native plugin open kandev's real create-task modal (prefilled via
initialValues) instead of POSTing directly.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(plugins): harden filesystem/URL sinks against CodeQL findings

Add sink-level guards on the plugin trust boundary: securejoin containment on
archive extraction (zip-slip), plugin-id validation before every fs_store path,
http/https scheme validation on install-from-URL, and non-interpolated ws-handler
error logging.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(plugins): address review findings (races, resource caps, lifecycle)

- serialize per-plugin startup to close a TOCTOU double-spawn race, and let a
  plugin restart after exhausting attempts
- bound plugin startup with an explicit 30s timeout
- reject backslash paths and cap decompressed bytes by actual size in pkgtar;
  only mark a package Signed when a verifier actually ran and passed
- delete plugin_state on uninstall; validate webhook keys against the manifest
  and cap webhook body size; restart an active plugin when a new version installs

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(plugins): sanitize plugin-id path sinks for CodeQL

Pin the plugin id to a single path segment with filepath.Base at recordPath/
configPath and pkgtar.Remove — a barrier the taint analysis recognizes.
Behaviour-identical for valid ids (already validated by safePluginID); clears
the go/path-injection alerts.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(plugins): inline plugin-id validation at path sinks for CodeQL

filepath.Base does not strip '..', so it is not a path-injection barrier. Call
the recognized safePluginID / id-pattern guard inline in Delete/GetConfig/
SetConfig and pkgtar.Remove — the same barrier that already cleared the Get sink.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(plugins): address code-review findings (backend)

- add capability-gating tests for the Host RPC service (was untested)
- close a stop-during-start orphan race so Disable/Uninstall can't leave a
  supervised subprocess behind
- on failed upgrade, remove only the new version dir (not all versions + data);
  restart the prior version
- validate manifest version and reject ids ending in .config (record-file alias)
- make Deliverer.Refresh non-blocking and cancel in-flight delivery on worker stop
- clamp out-of-range webhook status, skip-and-warn corrupt records in List,
  write records atomically, semver-aware sideload version pick

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(plugins): address code-review findings (frontend)

- wrap plugin routes + settings routes in a shared PluginErrorBoundary so a
  throwing plugin page shows a fallback instead of white-screening the SPA
- fix disable/re-enable in one session: keep the cached registration and
  re-run initialize instead of relying on a cached ES-module re-import
- prefix root-relative bundle/style URLs with apiBaseUrl (split-origin/Tauri)
- surface partial-install warnings via toast.warning instead of a bare success
- dedupe/remove injected style links on unload; gate PluginNavItems on the flag

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(plugins): serialize per-plugin lifecycle + guard config writes

- add a per-plugin keyed lock in Service so concurrent Enable/Disable/Install/
  Uninstall/UpdateConfig for one id are serialized (no status-machine race)
- take s.mu in SetConfig/GetConfig and write config atomically
- bound each plugin initialize() with a timeout so one hung bundle can't stall
  the rest of the boot load

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* test(plugins): split service_test.go to satisfy file-length lint

Move the install/URL test group into service_install_test.go; no logic change.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* ci: build and ship the e2e fixture plugin package to E2E shards

The plugin E2E specs' global-setup requires apps/backend/.build/kandev-plugin-e2e-1.0.0.tar.gz.
Build it in the E2E build job, upload it as an artifact, and download it in both
the regular and container shard jobs.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Kandev Agent <agent@kandev.dev>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
2026-07-17 12:00:26 +01:00

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Raw Blame History

id, title, status, wave, depends_on, plan
id title status wave depends_on plan
task-08 Tool invocation client + webhook & UI reverse proxies pending 2
task-05
docs/plans/plugins/plan.md

Tool invocation client + webhook & UI reverse proxies

Title

Outbound HTTP to plugins: tool invocation client (kandev→plugin), external webhook reverse proxy, and iframe UI page reverse proxy with header stripping.

Inputs

  • Spec docs/specs/plugins/spec.md → "Agent tool invocation" (POST {base_url}/tools/{name}, 30s timeout, {tool_call_id, input, context} → {output}), "External webhook proxy" (forward body+headers, add X-Plugin-Id,X-Webhook-Key), and the NEW UI proxy section (GET/POST {base_url}{ui.page.path}; strip X-Frame-Options and frame-restricting CSP from the plugin response so kandev can iframe it; inject nothing else).
  • Header-stripping precedent: read apps/backend/internal/agentctl/server/api/AGENTS.md and the reverse-proxy code there (Accept-Encoding handling + iframe-blocking header removal) and mirror the approach with httputil.ReverseProxy + ModifyResponse.

Acceptance

  1. internal/plugins/client.go: Client.InvokeTool(ctx, record, toolName, input, callCtx) (json.RawMessage, error), 30s timeout, non-2xx → typed error. Client.Health(ctx, record) error (used by task-07).
  2. internal/plugins/proxy.go: WebhookProxy(record, webhookKey) http.Handler forwarding to {base_url}{endpoints.webhooks templated with key}, adding X-Plugin-Id/X-Webhook-Key, preserving method/body/query.
  3. UIProxy(record, page) http.Handler reverse-proxying to {base_url}{page.path}, ModifyResponse strips X-Frame-Options and removes frame-ancestors from CSP; rewrites relative redirects under the kandev proxy path.
  4. Both proxies 404/503 when record is nil / not active (the handler layer task-09 passes only valid records; still guard).

Files

  • apps/backend/internal/plugins/client.go + client_test.go
  • apps/backend/internal/plugins/proxy.go + proxy_test.go (httptest upstream)

Verification

  • go test ./internal/plugins/... from apps/backend
  • make -C apps/backend lint

Output contract

Report: tool-call request/response shapes, exact headers stripped on UI proxy, redirect-rewrite behavior. Import task-05 types only; do not edit other tasks' files.

Dependencies

task-05.

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