Files
Stirling-PDF/frontend
ConnorYohandGitHub 4f26fdeb5c feat(desktop): show the AI assistant in SaaS mode via the cloud kill switch (#6666)
## What & why

Chained on top of #6649 (the `cloud/` refactor). The AI assistant was
effectively dead on desktop:

1. **Hidden** — `ChatFAB` gates on `aiEngineEnabled`, which desktop
reads from the **local** bundled backend's `/api/v1/config/app-config`.
The local backend has no AI engine, so the flag is always `false` and
the FAB never renders.
2. **Mis-routed** — even if shown, AI calls used `getApiBaseUrl()`,
which is empty/local on desktop, so the orchestrate stream and AI
result-file download missed the engine (which only runs in the cloud).

This PR wires AI properly **without hardcoding it on**, so the cloud
keeps the kill switch: flip `aiEngineEnabled` server-side and the
desktop FAB disappears on the next load — no desktop release required.
(Deliberately *not* assume-on, so a future "turn AI off" doesn't strand
shipped versions.)

## Changes

**General SaaS app-config service** (reusable for any cloud flag, not
just AI):
- `desktop/services/saasAppConfigService.ts` — SaaS-mode-only fetch +
5-min cache of the **public** `/api/v1/config/app-config` from the
**SaaS** backend over native HTTP (`@tauri-apps/plugin-http`, no CORS).
Returns `null` outside SaaS mode.
- `desktop/hooks/useSaasAppConfig.ts` — hook over it; reloads on
connection-mode change.

**AI gating + routing seams:**
- `useAiEngineEnabled()` — core reads `useAppConfig()` (web), desktop
reads `useSaasAppConfig()`. `ChatFAB` consumes it.
- `getAiBaseUrl()` — core uses the normal API base (web), desktop points
AI calls at the SaaS backend. `ChatContext` uses it for the orchestrate
stream + result-file download.
- `operationRouter` — route `/api/v1/ai/*` to the SaaS backend
(cloud-only prefix).

**Docs:** AGENTS.md gains a short "cloud feature flags on desktop" note
so the pattern is maintained.

## Verification
- `tsc --noEmit` green for saas / desktop / cloud flavors
- `eslint --max-warnings=0` clean (cloud-layer guardrail respected — the
platform-coupled bits live in `desktop/`)
- New `saasAppConfigService.test.ts` (3 tests) + existing
`operationRouter` / `tauriHttpClient` / `httpErrorHandler` suites green
- 0 stray compiled artifacts

## Not headlessly verifiable — needs a live Tauri smoke
The orchestrate **SSE stream** uses the webview's global `fetch` (native
HTTP can't stream the body the same way), so it's subject to browser
CORS to the SaaS backend. The `SupabaseSecurityConfig` tauri-origin
allowance (from #6649) covers it, but please confirm on a real build:
open the FAB in SaaS mode, run an agent task, watch the stream + a
result-file download succeed.
2026-06-17 14:10:35 +00:00
..
2026-04-27 11:35:50 +01:00
2026-06-16 16:48:30 +01:00
2026-06-16 17:16:07 +01:00
2026-05-22 13:40:34 +01:00

Frontend

All frontend commands are run from the repository root using Task:

  • task frontend:dev — start Vite dev server (localhost:5173)
  • task frontend:build — production build
  • task frontend:test — run tests
  • task frontend:test:watch — run tests in watch mode
  • task frontend:lint — run ESLint + cycle detection
  • task frontend:typecheck — run TypeScript type checking
  • task frontend:check — run typecheck + lint + test
  • task frontend:install — install npm dependencies

For desktop app development, see the Tauri section below.

Layout

frontend/ is a workspace containing one or more apps. Today it holds the PDF editor under frontend/editor/; new apps (the developer portal, etc.) will sit alongside it as siblings. Shared tooling — package.json, node_modules, .storybook/, ESLint, Prettier — lives at frontend/ so every app installs once and lints with the same config.

Environment Variables

The editor's environment variables live in committed .env files at frontend/editor/:

  • .env — used by all builds (core, proprietary, and as the base for desktop/SaaS)
  • .env.desktop — additional vars loaded in desktop (Tauri) mode
  • .env.saas — additional vars loaded in SaaS mode

These files contain non-secret defaults and are checked into Git, so most dev work needs no further setup.

To override values locally (API keys, machine-specific settings), create an uncommitted sibling editor/.env.local / editor/.env.desktop.local / editor/.env.saas.local. Vite automatically layers these on top of the committed files.

Docker Setup

For Docker deployments and configuration, see the Docker README.

Tauri

All desktop tasks are available via Task. From the root of the repo:

Dev

task desktop:dev

This ensures the JLink runtime and backend JAR exist (skipping if already built), then starts Tauri in dev mode.

Build

task desktop:build

This does a full clean rebuild of the backend JAR and JLink runtime, then builds the Tauri app for production.

Platform-specific dev builds are also available:

task desktop:build:dev           # No bundling
task desktop:build:dev:mac       # macOS .app bundle
task desktop:build:dev:windows   # Windows NSIS installer
task desktop:build:dev:linux     # Linux AppImage

You can also run JLink steps individually:

task desktop:jlink          # Build JAR + create JLink runtime
task desktop:jlink:jar      # Build backend JAR only
task desktop:jlink:runtime  # Create JLink custom JRE only
task desktop:jlink:clean    # Remove JLink artifacts

Clean

task desktop:clean

Removes all desktop build artifacts including JLink runtime, bundled JARs, Cargo build, and dist/build directories.