Operations

Environment

Copy .env.example to .env. Full list:

Variable	Default	Purpose
`NODE_ENV`	`development`	`production` under the NixOS module (and CI); gates the `DRIVER_DEBUG` default
`PORT` / `HOST`	`3000` / `127.0.0.1`	listen address (keep localhost behind nginx)
`APP_PASSWORD`	(required)	admin access key — generate with `openssl rand -base64 24`
`SESSION_TTL_HOURS`	`720`	Bearer session lifetime (30 days)
`DATA_DIR`	`./data`	holds `kisassistant.db` (SQLite)
`CDN_DIR`	`./cdn`	local file CDN storage (avatars; NixOS: under state dir)
`OCR_LANG`	`eng`	tesseract language(s) for the OCR tool
`OCR_MAX_CHARS`	`100000`	transcription cap (longer results are truncated + flagged)
`TESSERACT_BIN`	`tesseract`	path to the tesseract binary (NixOS module puts it on PATH; missing binary cleanly disables OCR with 501)
`DRIVER_DEBUG`	`true` dev / `false` prod	per-driver debug logging to stdout
`WIKI_URL`	`https://git.kisakay.com/k/chat/wiki`	remote docs wiki — `GET /wiki` redirects (302) there
`SMTP_HOST` / `SMTP_PORT` / `SMTP_SECURE`	(empty) / `587` / `false`	key-recovery mailer — empty host disables it (`false` = STARTTLS, `true` = implicit TLS/465)
`SMTP_USER` / `SMTP_PASS`	(empty)	SMTP auth (omit both for open relays / local catchers)
`SMTP_FROM`	`KisAssistant <[email protected]>`	sender address
`APP_URL`	`http://localhost:3000`	public base URL used in reset links — must be the real origin in prod
`RESET_TTL_MIN`	`60`	reset-link lifetime (single use)
`RATE_LIMIT_MAX` / `RATE_LIMIT_WINDOW_MIN`	`5` / `10`	login rate limit per IP
`OLLAMA_HOST` / `OLLAMA_ENABLED`	`http://10.66.66.4:11434` / `true`	local-model driver
`MISTRAL_`, `GLM_`, `DEEPSEEK_`, `ANTHROPIC_`, `OPENAI_*`	disabled	API drivers: set `_ENABLED=true` and* `*_API_KEY`
`GLM_BASE_URL`	`https://api.z.ai/api/paas/v4`	Zhipu platform override (mainland China: `https://open.bigmodel.cn/api/paas/v4`)

Local development

bun install
bun run dev              # backend watch mode (restarts on edit), :3000
bun run dev:frontend     # Vite HMR + /api proxy, :5173 (use this for UI work)
bun run dev:all          # both at once
bun run build:frontend   # production build into public/

Smoke tests: start the backend on a free non-3000 port with a throwaway DATA_DIR (port 3000 is the owner's dev server — do not touch it), then drive the API with curl/python: login → models → conversations → chat → share → unshare. See AGENTS.md.

Managing accounts

Log in as admin with the APP_PASSWORD key.
Open Accounts → New account → username (+ display name).
Copy the one-time ka_… key and hand it to the owner (chat, QR code, …).
Users set their display name, avatar (upload box in profile settings, or a remote URL e.g. from catbox.moe) and theme in the profile settings.
Rotate a compromised key with the regenerate button (old sessions die); delete removes the account with all its chats and shares.

Admin Center (`/admin`) & self-registration

The sidebar Admin Center button (admin only) opens the /admin page with three tabs: Accounts (same manager as before, incl. the Ollama model catalog), Features (server-side switches), Mail (SMTP status).

registration_enabled (default off): when on, the login page shows a working Register button — anyone can create an account (key shown once) via POST /api/auth/register. When off, the button is greyed with the tooltip "Registration currently disabled on this platform" and the endpoint answers 403. Flipped live, no restart.
tools_ocr_enabled (default on): admin kill-switch for the OCR tool.
Flags live in the settings SQLite table, edited via GET/PATCH /api/admin/settings (admin Bearer only).

Key recovery via email (optional)

Set the SMTP_* vars (and the real public APP_URL) to enable it; otherwise the login page hides the "Forgot your access key?" link.

Admin sets a recovery email at account creation (or the user sets their own in profile settings).
User clicks the link on the login page and enters their username. The API always answers {ok:true} (no account enumeration) and, if the account has an email, sends a one-time /reset/<token> link (60 min, single use).
Opening the link shows a confirm page; confirming rotates the key immediately — the new ka_… key is displayed once, old sessions die. (admin itself is excluded: its key lives in .env.)

Local file CDN (avatars)

PUT /cdn/<ns>/<key> (Bearer) / GET /cdn/<ns>/<key>.<ext> (public), e.g. /cdn/avatar/<account-id>.png. Namespaces live in CDN_NAMESPACES (src/cdn.ts) — add one to extend (future usage).

Allowed types only jpg/png/webp, verified by magic bytes, never by extension (client filename is ignored; the stored extension comes from detection). Everything else → 415, unknown namespace/ext → 404.
avatar rules: 5 MB max (413 above), 5 uploads max per 2 h per account (429 + Retry-After), ownership enforced (own id, or admin).
Served with fixed Content-Type, nosniff, Cache-Control: public, max-age=3600. No listing, no traversal (strict charsets + SPA fallback).

Platform tools & attachments

Uploads always go through platform tools (GET /api/tools lists them with availability). Today: OCR (POST /api/tools/ocr, tesseract).

Images (jpg/png/webp, 5 MB max, magic-verified, 20 jobs/hour/account) are transcribed on the backend to TXT — the model never receives image bytes. Text files ride the text CDN namespace (UTF-8 validated, 500 KB max, keys prefixed with the account id).
The UI (paperclip menu in the composer) explains this and always shows a pre-transcription preview: the user reviews/edits the text, then attaches it. Attachments travel as labeled text blocks inside the message, so they persist in history and work with every model.

NixOS deployment (`chat.kisakay.com`)

Full step-by-step guide: NIXOS-HOSTING.md.

flake.nix exposes packages.<system>.default (backend + prebuilt frontend, frontend compiled offline from frontend/bun.lock via a fixed-output bun install) and nixosModules.default.

imports = [ kisassistant.nixosModules.default ];
services.kisassistant = {
  enable = true;
  package = kisassistant.packages.${pkgs.system}.default;  # required
  domain = "chat.kisakay.com";   # legacy switch: implies nginx + ACME
  enableNginx = true;            # explicit; requires domain
  passwordFile = "/run/secrets/kisassistant-password";  # agenix/sops-nix
  ollamaHost = "http://10.66.66.4:11434";
  extraEnv = { MISTRAL_ENABLED = "true"; };              # optional
};
security.acme.acceptTerms = true;  # required for the ACME/TLS vhost

The module sets NODE_ENV=production, CDN_DIR=/var/lib/kisassistant/cdn and DRIVER_DEBUG=false for the systemd service. enableNginx is a tri-state: true/false force the bundled reverse proxy on/off, null (the default) keeps the legacy behaviour (nginx iff domain is set).

Secrets (passwordFile, API keys) must come from files (agenix/sops-nix), never baked into the Nix store. The service stores SQLite under /var/lib/kisassistant/data; nginx terminates TLS and proxies to 127.0.0.1:3000.

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