# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project Overview

Sub Router is a Surge proxy subscription management system. It aggregates nodes from upstream subscriptions, allows adding custom static nodes and rules, and generates a combined Surge configuration file served at `/surge/:token`.

## Commands

```bash
# Development (starts both server and web dev server concurrently)
pnpm dev

# Server only (port 3456, hot-reload via tsx watch)
pnpm dev:server

# Frontend only (port 5173, proxies /api and /surge to :3456)
pnpm dev:web

# Build frontend for production
pnpm build:web

# Production start (serves built frontend + API on port 3456)
pnpm start

# Type check frontend
cd web && pnpm exec tsc --noEmit

# Type check server
cd server && pnpm exec tsc --noEmit

# Docker
docker compose up -d
```

## Architecture

**Monorepo with NPM Workspaces**: `server/` (Express + better-sqlite3) and `web/` (React + Vite). In production, Express serves the built frontend static files and API from a single port (3456).

### Key data flow

1. User adds upstream subscription URLs → backend fetches and parses nodes into `fetched_nodes` table
2. User adds static nodes via URI (ss://, vmess://, trojan://) → parsed and stored in `static_nodes` table
3. `GET /surge/:token` → `generator.ts` rebuilds the Surge config:
   - Takes first enabled subscription's `raw_config` as base template
   - **Replaces** `[Proxy]` section entirely with only enabled nodes (static first, then fetched)
   - **Rebuilds** `[Proxy Group]` select groups with only enabled node names
   - **Injects** user rules at the top of `[Rule]` section
   - Rewrites `#!MANAGED-CONFIG` URL

### Auth model

Two separate credentials exist:

- **Admin password**: Protects all `/api/*` routes (except `/api/auth/login` and `/api/auth/status`). Sent as `Authorization: Bearer <password>`. On first login with no password set, the submitted password becomes the password.
- **Surge token**: UUID stored in `config` table as `surge_token`. Embedded in the Surge subscription URL itself (`/surge/:token`). Returns 404 for wrong tokens. Regeneratable via `POST /api/config/surge-token`.

### API routes

- `POST /api/auth/login`, `GET /api/auth/status` — auth (no auth required)
- `GET /api/stats` — node/rule counts summary
- `/api/subscriptions` → `subscriptions.ts` (CRUD + `/:id/fetch`, `/:id/nodes`)
- `/api/nodes` → `nodes.ts` (fetched node toggle, static node CRUD)
- `/api/rules` → `rules.ts` (CRUD + `/reorder`)
- `/api/config` → `surge.ts` (`/surge-token` GET/POST, `/preview` GET)

### Database

SQLite with WAL mode at `server/data/sub-router.db`. Five tables: `subscriptions`, `fetched_nodes` (FK to subscriptions, CASCADE delete), `static_nodes`, `rules`, `config` (KV store for `password` and `surge_token`).

### Parsers (`server/src/parsers/`)

Convert protocol URIs to Surge proxy lines. Each parser returns `{ name, type, server, port, surgeLine }`. The subscription content parser handles both base64-encoded URI lists and raw Surge config format (extracting from `[Proxy]` section).

- **SS**: No TLS wrapping (Surge doesn't support SS over TLS; SS 2022 has built-in encryption)
- **VMess/Trojan**: `skip-cert-verify=false` (strict TLS verification)

On re-fetch, enabled state is preserved by node name: existing name→enabled mapping is saved before delete, then reapplied to new rows.

When renaming a static node (`PUT /api/nodes/static/:id`), the `surge_line` prefix is also updated to match the new name.

### Frontend

Five panels: Subscriptions (CRUD + fetch trigger), Static Nodes (paste URI, custom naming, double-click to rename), Node Selector (per-subscription toggle with regex batch operations), Rules (CRUD + drag reorder), Output (subscription URL + config preview). Dark cyberpunk theme with CSS variables, JetBrains Mono font.

### Generator limitation

`rebuildProxyGroup` in `generator.ts` only updates the **first** `= select,` group (due to `handled = true` flag). If a Surge template has multiple select groups, only the first gets its node list replaced.

## Route ordering matters

In `server/src/routes/`: specific paths like `/reorder` and `/fetched/batch` must be registered **before** parameterized `/:id` routes to avoid being captured by Express route matching.

## Legacy file

`index.js` at the repo root is a pre-rewrite single-file prototype. It is not used by the current system and can be ignored.

## Deployment

Multi-stage Docker build: frontend built on `node:22-slim`, output copied into production image alongside the server. The `./data` volume maps to `server/data/` inside the container for SQLite persistence.

The `Content-Disposition` header on `/surge/:token` controls the config profile name in Surge client (currently `IPLC.MAX.conf`). Certificate renewal uses acme.sh with `dns_cf` (Cloudflare DNS API validation).