docs: map existing codebase

2026-02-15 21:49:31 +01:00
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+# External Integrations
+
+**Analysis Date:** 2026-02-15
+
+## APIs & External Services
+
+**None** - No external third-party APIs currently integrated.
+
+## Data Storage
+
+**Databases:**
+- **PostgreSQL** (Primary)
+  - Connection via `pg` client library (8.11.3)
+  - Environment variables:
+    - `DB_HOST` - Default: `postgres` (Docker service name)
+    - `DB_PORT` - Default: `5432`
+    - `DB_USER` - Default: `postgres`
+    - `DB_PASSWORD` - Required secret
+    - `DB_NAME` - Default: `gravl`
+  - ORM/Client: `pg` (node-postgres) - Direct SQL queries, no ORM
+  - Initialization: `db/init.sql` - Schema and seed data
+  - Tables: users, programs, program_days, exercises, program_exercises, workout_logs, user_measurements, user_strength
+
+**File Storage:**
+- Local filesystem only - No external file storage service
+- Static assets served by Nginx from built frontend `dist/` directory
+
+**Caching:**
+- None detected - No Redis, Memcached, or other caching layer
+
+## Authentication & Identity
+
+**Auth Provider:**
+- Custom JWT-based authentication
+  - Implementation: `backend/src/index.js` (lines 22-29, 35-68)
+  - Token generation: `jsonwebtoken` 9.0.2
+  - Password hashing: `bcryptjs` 2.4.3
+  - Secret: `JWT_SECRET` environment variable (default: `gravl-secret-key-change-in-production`)
+  - Token expiration: 30 days
+
+**Auth Flow:**
+1. Frontend `AuthContext` (`frontend/src/context/AuthContext.jsx`) manages user state
+2. User registers or logs in via `/api/auth/register` or `/api/auth/login`
+3. Backend verifies credentials, generates JWT token
+4. Frontend stores token in `localStorage` as `token`
+5. Subsequent requests include `Authorization: Bearer {token}` header
+6. Backend `authMiddleware` validates token on protected routes
+7. User profile fetched on app load via `/api/user/profile`
+
+**Protected Routes:**
+- `/api/user/profile` - GET/PUT (requires auth)
+- `/api/user/measurements` - GET/POST (requires auth)
+- `/api/user/strength` - GET/POST (requires auth)
+- `/api/logs` - GET/POST (no auth check in code - potential security gap)
+- `/api/progression/:programExerciseId` - GET (no auth check - potential security gap)
+
+**Public Routes:**
+- `/api/health` - Health check endpoint
+- `/api/auth/register` - User registration
+- `/api/auth/login` - User login
+- `/api/programs` - List all programs
+- `/api/programs/:id` - Get program details
+- `/api/days/:dayId/exercises` - Get exercises for a day
+- `/api/today/:programId` - Get workout for day
+
+## Frontend-Backend Communication
+
+**API Base URL:**
+- Hardcoded as `/api` in `frontend/src/context/AuthContext.jsx` (line 2)
+- Development: Proxied by Vite to `http://localhost:3001`
+- Production: Proxied by Nginx to `http://gravl-backend:3001`
+
+**CORS:**
+- Enabled on backend via `cors` middleware 2.8.5
+- `app.use(cors())` in `backend/src/index.js` (line 19)
+
+**HTTP Methods:**
+- POST `/api/auth/register` - Register user
+- POST `/api/auth/login` - Login user
+- GET `/api/user/profile` - Get user profile
+- PUT `/api/user/profile` - Update user profile
+- POST `/api/user/measurements` - Add measurements
+- GET `/api/user/measurements` - Get measurement history
+- POST `/api/user/strength` - Add strength record
+- GET `/api/user/strength` - Get strength history
+- GET `/api/programs` - List programs
+- GET `/api/programs/:id` - Get program with days and exercises
+- GET `/api/days/:dayId/exercises` - Get exercises for day
+- GET/POST `/api/logs` - Get/create workout logs
+- GET `/api/logs/last/:programExerciseId` - Get last workout for exercise
+- GET `/api/progression/:programExerciseId` - Calculate suggested weight
+
+**Request/Response Format:**
+- Content-Type: `application/json`
+- Token: Passed in `Authorization: Bearer {token}` header
+- Response: JSON objects
+
+## Monitoring & Observability
+
+**Error Tracking:**
+- None detected - No Sentry, LogRocket, or similar
+
+**Logs:**
+- Backend: `console.error()` for errors (lines 48, 65, 98, 115, 133, 147, 165, 179, 190, 228, 246, 276, 294, 327, 380, 417)
+- Frontend: No error tracking integrated
+- Example: `console.error('Register error:', err)` in `backend/src/index.js` (line 48)
+
+**Database Logging:**
+- None detected - SQL queries not logged
+
+## Webhooks & Callbacks
+
+**Incoming:**
+- None detected
+
+**Outgoing:**
+- None detected
+
+## Environment Configuration
+
+**Required env vars for backend:**
+- `DB_HOST` - PostgreSQL hostname
+- `DB_PORT` - PostgreSQL port
+- `DB_USER` - Database user
+- `DB_PASSWORD` - Database password (REQUIRED SECRET)
+- `DB_NAME` - Database name
+- `JWT_SECRET` - JWT signing secret (REQUIRED SECRET for production)
+- `PORT` - Backend port (optional, default 3001)
+
+**Secrets location:**
+- Docker Compose: `docker-compose.yml` (lines 8-13) - **WARNING: Password visible in file**
+- Backend defaults: `backend/src/index.js` (lines 9, 14-16)
+- Frontend: None (token stored in browser localStorage)
+
+**Traefik Integration:**
+- Frontend exposed via Traefik reverse proxy
+- Host: `gravl.homelab.local`
+- HTTP and HTTPS support configured
+- Networks: `proxy` (external), `homelab` (internal Docker Compose network)
+
+## Service Dependencies
+
+**Backend Dependencies:**
+- PostgreSQL (required)
+- Traefik proxy (for production routing)
+
+**Frontend Dependencies:**
+- Backend API at `/api` (required for all authenticated operations)
+- Can operate in degraded mode if API is unavailable
+
+---
+
+*Integration audit: 2026-02-15*