ai_synth/CLAUDE.md

# AI Weekly Synth

## Overview
AI Weekly Synth is a self-hosted web application that generates AI-powered weekly news syntheses. Users configure their topics, categories, and preferred LLM provider, then the app searches the web, validates sources, and produces structured summaries.

## Architecture
- **Backend**: Rust (Axum) — `backend/`
- **Frontend**: SolidJS + Tailwind CSS v4 — `frontend/`
- **Database**: PostgreSQL (via sqlx with compile-time checked queries)
- **Deployment**: Docker only (`docker-compose.yml`)

## Project Structure
```
ai_synth/
├── backend/                 Rust/Axum backend
│   ├── src/
│   │   ├── main.rs          Entry point, CLI (serve, create-admin)
│   │   ├── router.rs        All API routes + middleware stack
│   │   ├── handlers/        HTTP handlers (auth, settings, sources, syntheses, admin, etc.)
│   │   ├── services/        Business logic (auth, email, encryption, scraper, LLM providers, synthesis pipeline)
│   │   ├── db/              Database queries (sqlx)
│   │   ├── models/          Data types + validation
│   │   ├── middleware/      Auth session extraction, CSRF check
│   │   └── util/            Token generation, hashing
│   ├── migrations/          SQL migrations (9 files)
│   ├── tests/               Integration tests (require Postgres)
│   ├── Cargo.toml
│   └── Dockerfile           Multi-stage build
├── frontend/                SolidJS frontend
│   ├── src/
│   │   ├── App.tsx          Router, layouts, route guards
│   │   ├── pages/           Login, Register, Home, Settings, Sources, GenerateSynthesis, SynthesisDetail, admin/*
│   │   ├── components/      Navbar, Layout, AdminLayout, Turnstile, ApiKeyManager, ui/*
│   │   ├── api/             API clients (auth, settings, sources, syntheses, admin, config, apiKeys)
│   │   ├── contexts/        AuthContext (session-based)
│   │   ├── i18n/            French translations (i18n-ready for future languages)
│   │   └── utils/           SSE client, date formatting, provider info
│   ├── package.json
│   └── vite.config.ts       SolidJS + Tailwind + dev proxy
├── docs/                    Analysis reports + implementation plans
├── docker-compose.yml       App + Postgres
├── .env.example             All required env vars documented
└── CLAUDE.md                This file
```

## Key Features
- **Authentication**: Email + magic link (passwordless), Cloudflare Turnstile captcha, 30-day session cookies
- **LLM Providers**: Google Gemini, OpenAI, Anthropic — users bring their own API keys
- **Generation Pipeline**: 2-pass (search with web grounding → scrape/validate URLs → rewrite summaries), adaptive per provider
- **Admin Module**: Provider/model curation, rate limit config, user management
- **Security**: AES-256-GCM encryption for API keys at rest, SSRF prevention in scraper, CSRF via X-Requested-With, HttpOnly/SameSite cookies
- **Export**: Email via Resend, PDF, Markdown
- **Real-time**: SSE for generation progress streaming

## Running Locally

### Docker (production-like)
```bash
cp .env.example .env   # Fill in values
docker compose up
```

### Development
```bash
# Backend (requires Postgres running)
cd backend && cargo run -- serve

# Frontend (proxies /api to backend)
cd frontend && npm install && npm run dev
```

### CLI
```bash
# Create first admin user
cd backend && cargo run -- create-admin admin@example.com
```

## Testing
```bash
# Backend unit tests (no Postgres needed)
cd backend && cargo test --lib

# Backend integration tests (requires Postgres)
TEST_DATABASE_URL=postgres://user:pass@localhost:5432/postgres cargo test

# Frontend unit tests
cd frontend && npx vitest run

# Frontend type check
cd frontend && npx tsc --noEmit
```

## API Endpoints

### Public
- `POST /api/v1/auth/register` — create account + magic link
- `POST /api/v1/auth/login` — request magic link
- `GET /api/v1/auth/verify` — verify token (email click)
- `POST /api/v1/auth/verify` — verify token (frontend API)
- `GET /api/v1/health` — health check

### Authenticated
- `GET/PUT /api/v1/settings` — user settings
- `GET/POST/DELETE /api/v1/sources` — sources CRUD + bulk/CSV import/export
- `GET/DELETE /api/v1/syntheses/:id` — syntheses CRUD
- `POST /api/v1/syntheses/generate` — trigger async generation
- `GET /api/v1/syntheses/generate/:job_id/progress` — SSE progress stream
- `POST /api/v1/syntheses/:id/send-email` — email synthesis
- `GET /api/v1/syntheses/:id/export/markdown` — Markdown download
- `GET /api/v1/syntheses/:id/export/pdf` — PDF download
- `GET/POST/DELETE /api/v1/user/api-keys` — LLM API key management
- `GET /api/v1/config/providers` — available providers/models

### Admin Only
- `GET/POST/PUT/DELETE /api/v1/admin/providers` — provider/model config
- `GET/PUT /api/v1/admin/rate-limits` — rate limit config
- `GET /api/v1/admin/users` — user list
- `PUT /api/v1/admin/users/:id/role` — role management

## Database (9 migrations)
Tables: `users`, `sessions`, `magic_link_tokens`, `user_settings`, `sources`, `syntheses`, `admin_providers`, `admin_rate_limits`, `user_api_keys`, `audit_log`

## Environment Variables
See `.env.example` for the complete list. Key ones:
- `DATABASE_URL` — Postgres connection string
- `MASTER_ENCRYPTION_KEY` — 64 hex chars for AES-256-GCM
- `SESSION_SECRET` — at least 64 chars
- `RESEND_API_KEY` — for email sending
- `TURNSTILE_SECRET_KEY` / `TURNSTILE_SITE_KEY` — captcha
- `APP_URL` — public URL (for CORS, magic links, cookies)

## Design Decisions
- Idiomatic Rust (learning project) — no unwrap() in production code
- Users bring their own LLM API keys (encrypted at rest)
- Admin curates available providers/models, users select from the list
- Single-tenant self-hosted (one instance per deployment)
- i18n-ready (French only for now, all strings in `frontend/src/i18n/fr.ts`)
- Adaptive generation pipeline: skips scrape+rewrite when native web grounding is sufficient