# Production Essentials Implementation Summary
## ✅ Completed Features
### 1. Authentication + Tenant Enforcement ✅
**Files Modified:**
- `app/middleware/auth.py` - Complete JWT authentication implementation
- `app/config.py` - Added `ENV` and `RATE_LIMIT_ENABLED` settings
- `app/main.py` - Updated all endpoints to use `get_auth_context()`
**Key Features:**
- **DEV Mode**: Uses `X-Tenant-Id` and `X-User-Id` headers (with defaults)
- **PROD Mode**: Requires JWT token, extracts `tenant_id`/`user_id` from claims
- **Security**: In PROD, `tenant_id` NEVER accepted from request body/query params
- All endpoints now enforce tenant isolation via auth context
**Implementation Details:**
- Uses `python-jose` for JWT verification
- Verifies token signature using `JWT_SECRET`
- Returns 401 if token invalid/missing
- Returns 403 if `tenant_id`/`user_id` missing from token
---
### 2. Rate Limiting ✅
**Files Created:**
- `app/middleware/rate_limit.py` - Rate limiting middleware
**Files Modified:**
- `app/main.py` - Applied rate limits to endpoints
**Rate Limits:**
- `POST /chat`: 10/minute per tenant
- `GET /kb/search`: 30/minute per tenant
- `POST /kb/upload`: 20/hour per tenant
**Key Features:**
- Per-tenant rate limiting (uses tenant_id from auth context)
- Falls back to IP-based limiting if tenant unavailable
- Configurable via `RATE_LIMIT_ENABLED` setting
- Uses `slowapi` library
---
### 3. Health Checks ✅
**Files Modified:**
- `app/main.py` - Added health check endpoints
**Endpoints:**
- `GET /health/live` - Always returns `{"status": "alive"}` (liveness probe)
- `GET /health/ready` - Checks dependencies, returns 503 if not ready (readiness probe)
**Checks:**
- Vector DB connection
- LLM API key configured
**Use Cases:**
- Kubernetes liveness/readiness probes
- Load balancer health checks
- Monitoring system checks
---
### 4. Basic Prometheus Metrics ✅
**Files Modified:**
- `app/main.py` - Added Prometheus instrumentation
- `requirements.txt` - Added `prometheus-client` and `prometheus-fastapi-instrumentator`
**Features:**
- Automatic request count and latency metrics
- Exposed at `/metrics` endpoint
- Standard Prometheus format
- No PII logged
**Metrics Available:**
- `http_requests_total` - Total requests by method, endpoint, status
- `http_request_duration_seconds` - Request latency histogram
- Standard FastAPI instrumentation metrics
---
## 📝 Updated Files
### Configuration
- `app/config.py` - Added `ENV`, `RATE_LIMIT_ENABLED` settings
### Dependencies
- `requirements.txt` - Added:
- `python-jose[cryptography]>=3.3.0` (JWT)
- `slowapi>=0.1.9` (Rate limiting)
- `prometheus-client>=0.19.0` (Metrics)
- `prometheus-fastapi-instrumentator>=6.1.0` (FastAPI integration)
### Endpoints Updated
All endpoints now use `get_auth_context()`:
- `POST /kb/upload` - Auth + rate limit (20/hour)
- `GET /kb/stats` - Auth
- `DELETE /kb/document` - Auth
- `DELETE /kb/clear` - Auth
- `POST /chat` - Auth + rate limit (10/minute)
- `GET /kb/search` - Auth + rate limit (30/minute)
### Testing
- `scripts/validate_rag.py` - Updated to include `X-Tenant-Id` and `X-User-Id` headers
- `tests/integration/test_health.py` - New health check tests
- `tests/integration/test_metrics.py` - New metrics endpoint tests
### Documentation
- `README.md` - Added "Production Essentials" section
- `PRODUCTION_SETUP.md` - New setup guide
---
## 🔒 Security Improvements
1. **Tenant Isolation**: Enforced at auth layer, cannot be bypassed
2. **JWT Verification**: Proper signature verification in production
3. **Rate Limiting**: Prevents abuse and ensures fair usage
4. **No PII Logging**: Production logs don't include full questions/documents
---
## 🧪 Testing
### Run Integration Tests
```bash
pytest tests/integration/
```
### Run Full Validation
```bash
python scripts/validate_rag.py
```
### Test Health Checks
```bash
curl http://localhost:8000/health/live
curl http://localhost:8000/health/ready
curl http://localhost:8000/metrics
```
---
## 🚀 Deployment Checklist
- [x] Authentication implemented
- [x] Rate limiting configured
- [x] Health checks added
- [x] Metrics exposed
- [x] Tests updated
- [x] Documentation updated
**Before Production:**
- [ ] Set `ENV=prod` in `.env`
- [ ] Set strong `JWT_SECRET` in `.env`
- [ ] Configure `ALLOWED_ORIGINS` for CORS
- [ ] Test JWT token generation/verification
- [ ] Verify rate limits work correctly
- [ ] Test health checks in deployment environment
- [ ] Set up Prometheus scraping for metrics
---
## 📊 Breaking Changes
**None** - All changes are backward compatible:
- Dev mode still works with headers/defaults
- Existing endpoints maintain same behavior
- New endpoints added (health checks, metrics)
- Rate limiting can be disabled via config
---
## 🔄 Migration Notes
**For Existing Clients:**
- No changes needed if using dev mode
- For production: Update to use JWT tokens instead of passing `tenant_id` in request body
**Environment Variables:**
```bash
# Required for production
ENV=prod
JWT_SECRET=your-secret-key-here
# Optional
RATE_LIMIT_ENABLED=true
```
---
**Implementation Date:** 2026-01-18
**Status:** ✅ Complete and Ready for Testing
