# BooCode v1.1 — Batch 10

**Theme:** BooTerm. Second container, dedicated to in-browser terminals. Per-session tmux. xterm.js + node-pty in-container. New pane type wires into the BooCode shell.
**Status:** Planned. Largest batch in v1.1. Depends on Batch 3 (pane system), Batch 7 (settings drawer pattern reused).
**Repo:** `/opt/boocode/` (shared monorepo). New `apps/booterm/` subdirectory.

## Goals

1. New container `booterm` running Fastify + node-pty + tmux. Per-session tmux session keyed by `(user, session_id)`.
2. xterm.js terminal pane in the BooCode shell. Multiple terminal panes per session, each attached to a separate tmux window.
3. PTY traffic over WebSocket. Auth via `Remote-User`.
4. tmux as session manager so terminals survive WebSocket reconnects, page refreshes, even container restarts.
5. Read+write capability scoped to project root. No `cd ..` escape.
6. Path-based routing: `code.indifferentketchup.com/api/term/*` → booterm; `/ws/term/*` → booterm.

## Architecture

```
browser ──HTTPS──> Caddy (droplet) ──Tailscale──> Authelia
                                                      │
                                                      ├── /api/chat/*, /ws/chat/*  → boocode  :9500
                                                      ├── /api/term/*, /ws/term/*  → booterm  :9501
                                                      └── /                        → boocode (SPA)

booterm container:
  - Fastify (Node 20)
  - node-pty
  - tmux installed in container (apk add tmux)
  - same Postgres (boocode_db)
  - mounts projects rw (scoped)
```

### Mount strategy

Decided: Option A. Per-project bind mounts in `docker-compose.yml`. Already applied: booterm has `/opt:/opt:rw` to keep parity with the existing boocode mount and avoid enumerating roots. Project root for any given session derives from `projects.root_path` and tmux launches with `cwd` set there.

### tmux session naming

Per-session tmux:

```
tmux session name: bc-<session_id>     (UUID, sanitized — alphanumeric + hyphen)
tmux windows:      term-<pane_id>      (one window per terminal pane)
```

booterm spawns `tmux new-session -d -s bc-<sid> -c <project_root>` lazily on first attach. Subsequent attaches do `tmux new-window -t bc-<sid>` for additional panes, or `tmux attach -t bc-<sid>` and select window.

## Data model

| Column | On | Type | Default | Notes |
|---|---|---|---|---|
| (none) | — | — | — | terminals are tmux-managed, no DB rows |
| `kind = 'terminal'` | `session_panes.kind` CHECK | — | — | Extend CHECK to include `'terminal'` |
| `state.tmux_window` | `session_panes.state` JSONB | TEXT | NULL | Which tmux window this pane attaches to |

Schema (already applied to live DB + schema.sql):

```sql
ALTER TABLE session_panes DROP CONSTRAINT IF EXISTS session_panes_kind_check;
ALTER TABLE session_panes ADD CONSTRAINT session_panes_kind_check
  CHECK (kind IN ('chat', 'file_browser', 'terminal'));
```

## Backend (booterm)

New app at `apps/booterm/`:

```
apps/booterm/
├── src/
│   ├── index.ts        # Fastify + WS + auth
│   ├── auth.ts         # Remote-User middleware (same pattern as boocode)
│   ├── db.ts           # pg pool (shared boocode_db)
│   ├── routes/
│   │   ├── health.ts
│   │   └── terminals.ts  # POST /api/term/sessions/:sid/panes/:pid/start (creates tmux window)
│   ├── pty/
│   │   ├── manager.ts    # tmux process management
│   │   └── pty.ts        # node-pty wrapper for `tmux attach -t ... -d`
│   └── ws/
│       └── attach.ts     # WS /ws/term/sessions/:sid/panes/:pid → PTY bidi pipe
├── package.json
└── tsconfig.json
```

### Endpoints

| Method | Path | Notes |
|---|---|---|
| GET | `/api/term/health` | Ping |
| POST | `/api/term/sessions/:sid/panes/:pid/start` | Idempotent tmux window create. Returns `{tmux_window: "term-<pid>"}` |
| WS | `/ws/term/sessions/:sid/panes/:pid` | Attach PTY |
| POST | `/api/term/sessions/:sid/panes/:pid/resize` | `{cols, rows}` |
| POST | `/api/term/sessions/:sid/panes/:pid/kill` | Kill the tmux window |

WS frames (binary or text):

```
client → server: pty input (raw bytes, typed by user)
server → client: pty output (raw bytes from shell)
server → client: {type: "exit", code} on window close
```

### Auth + scoping

- `Remote-User` required on WS upgrade.
- `session_id` validated: lookup in `sessions` table; require row exists.
- `pane_id` validated: must exist in `session_panes` with `kind = 'terminal'` and matching `session_id`.
- Project root derived from `sessions.project_id → projects.root_path`. tmux starts `cd <root>` in that dir. **No chroot.** User can `cd /` and read anything mounted into the container.
  - Future hardening: namespace/chroot. Out of v1.1 scope.

### tmux config

`apps/booterm/tmux.conf` bundled into image at `/etc/booterm/tmux.conf`; tmux invocations use `-f /etc/booterm/tmux.conf`:

```
set -g default-terminal "screen-256color"
set -g history-limit 50000
set -g mouse on
setw -g mode-keys vi
set -g status off
set -g destroy-unattached off
```

Boolab pattern (from `services/tmux_session.py`).

## Frontend

| File | Change |
|---|---|
| `apps/web/src/components/panes/TerminalPane.tsx` (NEW) | xterm.js mount, WS attach, resize handler |
| `apps/web/src/api/client.ts` | `api.terminals.start(sessionId, paneId)`, `api.terminals.resize(...)`, `api.terminals.kill(...)` |
| `apps/web/src/components/Workspace.tsx` | Add 'terminal' to the pane kind enum; spawn button → POST start → render TerminalPane. Tab UI lives in Workspace.tsx — there is no PaneTab.tsx file. |
| `apps/web/package.json` | `xterm` + `xterm-addon-fit` + `xterm-addon-web-links` |

### TerminalPane

```tsx
useEffect(() => {
  const term = new Terminal({ fontFamily: 'JetBrains Mono', fontSize: 14, theme: ... });
  const fit = new FitAddon();
  term.loadAddon(fit);
  term.loadAddon(new WebLinksAddon());
  term.open(containerRef.current);
  fit.fit();

  const proto = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
  const ws = new WebSocket(`${proto}//${window.location.host}/ws/term/sessions/${sid}/panes/${pid}`);
  ws.binaryType = 'arraybuffer';
  ws.onmessage = e => term.write(typeof e.data === 'string' ? e.data : new Uint8Array(e.data));
  term.onData(data => ws.send(data));
  term.onResize(({ cols, rows }) => api.terminals.resize(sid, pid, cols, rows));

  const ro = new ResizeObserver(() => fit.fit());
  ro.observe(containerRef.current);

  return () => { ws.close(); term.dispose(); ro.disconnect(); };
}, [sid, pid]);
```

Dev: vite.config.ts needs `/api/term` and `/ws/term` proxy entries mirroring the existing `/api` and `/ws` ones.

## Send-to-terminal from chat

Boolab pattern: select text in a message → "Send to terminal" button → text becomes terminal input.

- Right-click context menu on selected text in chat → "Send to terminal" submenu lists open terminal panes.
- Click target → sends `<text>\n` to that pane's WS.

Implementation:

| File | Change |
|---|---|
| `apps/web/src/components/MessageBubble.tsx` | Selection handler + context menu |
| `apps/web/src/lib/events.ts` | New event `send_to_terminal` with payload `{pane_id, text}` |
| `apps/web/src/components/panes/TerminalPane.tsx` | Subscribe to event for its `pane_id`, write to WS |

## Docker compose (already applied)

booterm service is already in `docker-compose.yml` with:
- build context `.`, dockerfile `apps/booterm/Dockerfile`
- port `100.114.205.53:9501:3000`
- `/opt:/opt:rw` mount
- `DATABASE_URL` env pointing at `boocode_db`
- `boocode_net` network
- depends_on: `boocode_db`

Do not re-edit compose.

## Backend dependencies

`apps/booterm/package.json`:
- `fastify`
- `@fastify/websocket`
- `pg`
- `zod`
- `node-pty`
- `tslib`

`node-pty` requires native build. Dockerfile installs `python3 make g++` in build stage and `tmux` in runtime stage:

```dockerfile
FROM node:20-alpine AS build
RUN apk add --no-cache python3 make g++ tmux
WORKDIR /app
COPY ...
RUN pnpm install --frozen-lockfile && pnpm build

FROM node:20-alpine
RUN apk add --no-cache tmux
WORKDIR /app
COPY --from=build /app/apps/booterm/dist ./dist
COPY --from=build /app/node_modules ./node_modules
EXPOSE 3000
CMD ["node", "dist/index.js"]
```

## Files to touch

**New app:**

- `apps/booterm/` (entire subtree)

**Existing changes:**

- `apps/web/package.json`
- `apps/web/src/api/client.ts`
- `apps/web/src/api/types.ts`
- `apps/web/src/components/Workspace.tsx`
- `apps/web/src/components/MessageBubble.tsx`
- `apps/web/src/components/panes/TerminalPane.tsx` (NEW)
- `apps/web/src/lib/events.ts`
- `apps/web/vite.config.ts` (proxy entries)

**Already done by user — do not touch:**

- `docker-compose.yml` (booterm service added)
- `apps/server/src/schema.sql` (terminal CHECK constraint)
- Live DB constraint applied

## Verification

1. `docker compose up -d --build booterm` → container healthy.
2. `curl -s http://100.114.205.53:9501/api/term/health -H 'Remote-User: sam'` → 200.
3. Browser smoke test:
   - Open a session. Workspace → "+ Terminal" → terminal pane appears with shell prompt in project root.
   - Type `ls -la` → output.
   - Type `vim test.txt`, write something, save, `:q` → file exists on host (since rw mount).
   - Refresh browser → terminal reconnects, history intact (tmux persistence).
   - Open second terminal pane → same project, separate tmux window. Both work independently.
   - Select code in chat → right-click → "Send to terminal" → terminal pane receives the text.
   - Container restart (`docker compose restart booterm`) → on reconnect, tmux session resumes from where it left off.
   - Close pane via tab context menu → tmux window killed. Reopen pane → fresh shell.

## Constraints

- node-pty is a native dep. Image size grows.
- tmux history capped at 50k lines per window.
- WebSocket frames are bidirectional binary; `binaryType = 'arraybuffer'`.
- Resize debounced 100ms client-side; backend `tmux resize-window` per resize.
- No chroot/namespace isolation in v1.1. User has full read+write under `/opt/`. Acceptable for single-user homelab.
- Don't expose 9501 on 0.0.0.0. Tailscale binding only (already configured in compose).

## Open

- Color theme matching for xterm.js. Defer.
- File-drop into terminal (upload via terminal pane). Out of scope.
- Multi-user (each user gets own tmux server) — defer until BooCode goes multi-user, which isn't planned.
- BooCoder container — same skeleton as booterm but with edit_file / create_file tools instead of PTY. Will follow this pattern when built.
