# LOAF Membership Platform - Backend API

FastAPI-based backend service for the LOAF (LGBT Organization and Friends) membership management platform.

## Table of Contents

- [Setup & Installation](#setup--installation)
- [Architecture & Code Structure](#architecture--code-structure)
- [API Documentation](#api-documentation)
- [Deployment Guide](#deployment-guide)
- [Troubleshooting](#troubleshooting)

---

## Setup & Installation

### Prerequisites

- **Python**: 3.9 or higher
- **PostgreSQL**: 13 or higher
- **Cloudflare R2**: Account and credentials (for file storage)
- **Stripe**: Account and API keys (for payments)
- **SMTP Server**: For sending emails (Gmail, SendGrid, etc.)

### 1. Clone Repository

```bash
cd backend
```

### 2. Create Virtual Environment

```bash
# Create virtual environment
python -m venv venv

# Activate virtual environment
# On macOS/Linux:
source venv/bin/activate

# On Windows:
venv\Scripts\activate
```

### 3. Install Dependencies

```bash
pip install -r requirements.txt
```

**Key Dependencies:**
- `fastapi==0.110.1` - Web framework
- `uvicorn==0.25.0` - ASGI server
- `sqlalchemy==2.0.44` - ORM for database
- `psycopg2-binary==2.9.10` - PostgreSQL adapter
- `python-jose[cryptography]==3.5.0` - JWT tokens
- `passlib[bcrypt]==1.7.4` - Password hashing
- `aiosmtplib==5.0.0` - Async email sending
- `boto3==1.35.95` - AWS SDK (for Cloudflare R2)
- `stripe==11.4.0` - Payment processing
- `python-multipart==0.0.18` - File uploads

### 4. Database Setup

#### Create PostgreSQL Database

```bash
# Connect to PostgreSQL
psql -U postgres

# Create database
CREATE DATABASE membership_db;

# Create user (optional)
CREATE USER membership_user WITH PASSWORD 'your_password';
GRANT ALL PRIVILEGES ON DATABASE membership_db TO membership_user;

# Exit psql
\q
```

#### Run Migrations

**⚠️ IMPORTANT:** For complete migration documentation, see **[MIGRATIONS.md](./MIGRATIONS.md)**

**For Fresh Database (New Deployment):**

```bash
# Run comprehensive initial schema (includes all base tables)
psql -U postgres -d membership_db -f migrations/000_initial_schema.sql
```

This single migration creates:
- All 10 ENUM types (userstatus, userrole, rsvpstatus, etc.)
- All 17 base tables (users, events, subscriptions, donations, RBAC, etc.)
- 30+ performance indexes
- Default storage_usage record

**For Existing Database (Incremental Updates):**

If you already have a database and need to apply specific updates, see the migration sequence in [MIGRATIONS.md](./MIGRATIONS.md).

**Next Steps After Migration:**

```bash
# 1. Seed permissions (59 permissions across 10 modules)
python seed_permissions_rbac.py

# 2. Create superadmin user (interactive)
python create_admin.py
```

### 5. Environment Configuration

Create `.env` file in the backend directory:

```bash
# Database
DATABASE_URL=postgresql://postgres:password@localhost:5432/membership_db

# JWT Configuration
JWT_SECRET=your-super-secret-key-change-in-production
JWT_ALGORITHM=HS256
ACCESS_TOKEN_EXPIRE_MINUTES=30

# SMTP Email Configuration
SMTP_HOST=smtp.gmail.com
SMTP_PORT=587
SMTP_USERNAME=your-email@gmail.com
SMTP_PASSWORD=your-app-password
SMTP_FROM_EMAIL=noreply@loaf.org
SMTP_FROM_NAME=LOAF Membership Platform

# Frontend URL (for email links and CORS)
FRONTEND_URL=http://localhost:3000

# Cloudflare R2 Storage
R2_ACCOUNT_ID=your-cloudflare-account-id
R2_ACCESS_KEY_ID=your-r2-access-key
R2_SECRET_ACCESS_KEY=your-r2-secret-key
R2_BUCKET_NAME=loaf-membership
R2_PUBLIC_URL=https://your-r2-bucket.r2.dev

# Stripe Payment Processing
STRIPE_SECRET_KEY=sk_test_your_stripe_secret_key
STRIPE_PUBLISHABLE_KEY=pk_test_your_stripe_publishable_key
STRIPE_WEBHOOK_SECRET=whsec_your_webhook_secret

# Server Configuration
PORT=8000
HOST=0.0.0.0
CORS_ORIGINS=http://localhost:3000,http://localhost:3001

# Optional: Sentry (error tracking)
SENTRY_DSN=your-sentry-dsn
```

**Important Notes:**
- **Gmail SMTP**: Use App Password, not your regular password. Enable 2FA and generate app-specific password at https://myaccount.google.com/apppasswords
- **JWT_SECRET**: Generate a strong random key: `openssl rand -hex 32`
- **Stripe Webhook Secret**: Get from Stripe Dashboard � Developers � Webhooks

### 6. Seed Initial Data

```bash
# Seed permissions (must be run after migrations)
python seed_permissions_rbac.py

# Create superadmin user (optional)
python create_superadmin.py
```

### 7. Start Development Server

```bash
# Start with auto-reload
uvicorn server:app --reload --host 0.0.0.0 --port 8000

# Or using the PORT from .env
uvicorn server:app --reload --host 0.0.0.0 --port $PORT
```

**Server will be available at:**
- API: http://localhost:8000
- Swagger UI: http://localhost:8000/docs
- ReDoc: http://localhost:8000/redoc

---

## Architecture & Code Structure

### Project Structure

```
backend/
   server.py                 # Main FastAPI app + all API routes (~4000 lines)
   models.py                 # SQLAlchemy ORM models
   auth.py                   # JWT utilities + password hashing
   email_service.py          # Async email sending with HTML templates
   database.py               # Database connection & session management
   storage_service.py        # Cloudflare R2 file upload/download
   requirements.txt          # Python dependencies
   seed_permissions_rbac.py  # RBAC permissions seeding script
   migrations/               # Database migration SQL scripts
      001_initial_schema.sql
      009_create_donations.sql
      010_add_rejection_fields.sql
   .env                      # Environment variables (not in git)
```

### Core Technologies

| Technology | Purpose | Version |
|------------|---------|---------|
| FastAPI | Web framework | 0.110.1 |
| Uvicorn | ASGI server | 0.25.0 |
| SQLAlchemy | ORM for database | 2.0.44 |
| PostgreSQL | Relational database | 13+ |
| Python-JOSE | JWT token handling | 3.5.0 |
| Bcrypt | Password hashing | via passlib |
| Aiosmtplib | Async email sending | 5.0.0 |
| Boto3 | Cloudflare R2 client | 1.35.95 |
| Stripe | Payment processing | 11.4.0 |

### Key Data Models

#### User Model
**Status Flow:**
```
pending_email � pending_validation � pre_validated � payment_pending � active
                     �
                 rejected / inactive
```

**Key Fields:**
- Authentication: email, password_hash
- Profile: first_name, last_name, phone, bio, profile_photo_url
- Status tracking: status, role, email_verified
- Rejection: rejection_reason, rejected_at, rejected_by
- Partner info: partner_first_name, partner_last_name, partner_is_member

#### Event Model
- Event management with RSVP tracking
- Fields: title, description, location, start_at, end_at, capacity, published

#### Subscription Model
- Links users to subscription plans
- Tracks payment status, billing cycle, donations
- Fields: stripe_subscription_id, base_subscription_cents, donation_cents

#### Donation Model
- Separate tracking for standalone donations
- Types: member donations vs public donations
- Fields: amount_cents, donation_type, status, donor_email, donor_name

#### RBAC Models
- **Role**: Dynamic roles (admin, finance, superadmin)
- **Permission**: Granular permissions (users.view, events.create, etc.)
- **RolePermission**: Many-to-many relationship
- **UserRoleAssignment**: User role assignments

### Authentication System

**JWT Token Structure:**
```json
{
  "sub": "user@example.com",
  "user_id": "uuid",
  "role": "member",
  "exp": 1234567890
}
```

**Password Security:**
- Bcrypt hashing with automatic salt
- Never store plaintext passwords
- Token expiration: 30 minutes (configurable)

### Permission System (RBAC)

**59 Granular Permissions** across 10 modules:
- `users.*` - User management
- `events.*` - Event management
- `subscriptions.*` - Subscription management
- `donations.*` - Donation tracking
- `permissions.*` - RBAC administration

**Example Usage:**
```python
@api_router.get("/admin/users")
async def get_users(
    current_user: User = Depends(require_permission("users.view")),
    db: Session = Depends(get_db)
):
    # Only users with 'users.view' permission can access
    ...
```

### Email Service

**5 Email Templates:**
1. Email verification
2. Approval notification
3. Rejection with reason
4. Donation thank you
5. Payment prompt

All emails use branded HTML templates with LOAF color scheme.

### Storage Service (Cloudflare R2)

- Profile photo uploads (max 50MB)
- Event cover images
- Gallery images
- Automatic URL generation with CDN

---

## API Documentation

### Base URL

```
Development: http://localhost:8000
Production: https://api.loaf.org
```

### Authentication

Most endpoints require JWT token in Authorization header:
```
Authorization: Bearer <jwt_token>
```

### Interactive Docs

- **Swagger UI**: http://localhost:8000/docs
- **ReDoc**: http://localhost:8000/redoc

### Key Endpoint Groups

#### Authentication (`/api/auth`)
- `POST /auth/register` - User registration
- `POST /auth/login` - Login with JWT token
- `GET /auth/verify-email` - Email verification
- `GET /auth/me` - Current user profile

#### Member Profile (`/api/members`)
- `GET /members/profile` - Get profile
- `PUT /members/profile` - Update profile
- `POST /members/profile/upload-photo` - Upload profile picture
- `DELETE /members/profile/delete-photo` - Delete profile picture

#### Events (`/api/events`)
- `GET /events` - List published events
- `GET /events/{id}` - Event details
- `POST /events/{id}/rsvp` - Submit RSVP

#### Admin Users (`/api/admin/users`)
- `GET /admin/users` - List users (with filters)
- `PUT /admin/users/{id}/approve` - Approve user
- `POST /admin/users/{id}/reject` - Reject with reason
- `GET /admin/users/export` - Export to CSV

#### Admin Events (`/api/admin/events`)
- `GET /admin/events` - List all events
- `POST /admin/events` - Create event
- `PUT /admin/events/{id}` - Update event
- `PUT /admin/events/{id}/attendance` - Mark attendance

#### Subscriptions (`/api/admin/subscriptions`)
- `GET /admin/subscriptions` - List subscriptions
- `GET /admin/subscriptions/stats` - Statistics
- `GET /admin/subscriptions/export` - Export to CSV
- `POST /admin/subscriptions/{id}/cancel` - Cancel subscription

#### Donations (`/api/admin/donations`)
- `GET /admin/donations` - List donations
- `GET /admin/donations/stats` - Statistics
- `GET /admin/donations/export` - Export to CSV

#### Payments (`/api`)
- `POST /checkout/subscription` - Create Stripe checkout
- `POST /donations/checkout` - Create donation checkout
- `POST /webhooks/stripe` - Handle Stripe webhooks

### Response Formats

**Success:**
```json
{
  "id": "uuid",
  "field": "value"
}
```

**Error:**
```json
{
  "detail": "Error message"
}
```

**Status Codes:**
- 200 - Success
- 201 - Created
- 400 - Bad Request
- 401 - Unauthorized
- 403 - Forbidden
- 404 - Not Found
- 500 - Server Error

---

## Deployment Guide

### Production Setup

#### 1. Server Requirements
- Ubuntu 20.04 LTS+
- Python 3.9+
- PostgreSQL 13+
- 2GB+ RAM
- 20GB+ SSD

#### 2. Install Dependencies

```bash
sudo apt update && sudo apt upgrade -y
sudo apt install python3.9 python3.9-venv python3-pip postgresql nginx -y
```

#### 3. Application Setup

```bash
# Create directory
sudo mkdir -p /var/www/loaf-backend
cd /var/www/loaf-backend

# Setup virtual environment
python3.9 -m venv venv
source venv/bin/activate
pip install -r requirements.txt
```

#### 4. Configure Environment

Create production `.env` with:
- Strong JWT_SECRET (64+ chars)
- Production database credentials
- Production SMTP (SendGrid recommended)
- Cloudflare R2 production credentials
- Stripe LIVE API keys
- HTTPS frontend URL

#### 5. Database Setup

```bash
# Create production database
sudo -u postgres psql
CREATE DATABASE membership_prod;
CREATE USER membership_prod WITH ENCRYPTED PASSWORD 'strong_password';
GRANT ALL PRIVILEGES ON DATABASE membership_prod TO membership_prod;

# Run migrations
for file in migrations/*.sql; do
  psql postgresql://membership_prod:password@localhost/membership_prod -f "$file"
done

# Seed permissions
python seed_permissions_rbac.py
```

#### 6. Systemd Service

Create `/etc/systemd/system/loaf-backend.service`:

```ini
[Unit]
Description=LOAF Backend API
After=network.target postgresql.service

[Service]
Type=notify
User=www-data
Group=www-data
WorkingDirectory=/var/www/loaf-backend
Environment="PATH=/var/www/loaf-backend/venv/bin"
ExecStart=/var/www/loaf-backend/venv/bin/uvicorn server:app --host 0.0.0.0 --port 8000 --workers 4
Restart=always

[Install]
WantedBy=multi-user.target
```

Start service:
```bash
sudo systemctl enable loaf-backend
sudo systemctl start loaf-backend
```

#### 7. Nginx Reverse Proxy

```nginx
server {
    listen 80;
    server_name api.loaf.org;

    location / {
        proxy_pass http://127.0.0.1:8000;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}
```

#### 8. SSL Certificate

```bash
sudo apt install certbot python3-certbot-nginx -y
sudo certbot --nginx -d api.loaf.org
```

#### 9. Configure Stripe Webhook

- Stripe Dashboard � Webhooks
- Add endpoint: `https://api.loaf.org/api/webhooks/stripe`
- Events: checkout.session.completed, invoice.payment_succeeded
- Copy webhook secret to .env

### Monitoring

```bash
# View logs
sudo journalctl -u loaf-backend -f

# Database backup (daily cron)
pg_dump membership_prod | gzip > backup_$(date +%Y%m%d).sql.gz
```

### Security Checklist

- [ ] Strong passwords and JWT secret
- [ ] HTTPS with valid SSL
- [ ] Firewall configured
- [ ] SSH key authentication only
- [ ] Environment variables secured
- [ ] CORS restricted to production domain
- [ ] Stripe webhook verification enabled
- [ ] Regular backups configured
- [ ] Error tracking (Sentry) enabled

---

## Troubleshooting

### Database Connection Error
```bash
# Check PostgreSQL status
sudo systemctl status postgresql

# Verify DATABASE_URL format
postgresql://user:password@host:port/database
```

### Email Not Sending
- Gmail: Use App Password (not regular password)
- Enable 2FA first
- Generate App Password at https://myaccount.google.com/apppasswords

### JWT Token Invalid
- Check JWT_SECRET is consistent
- Token expires after 30 minutes
- User needs to log in again

### Stripe Webhook Failing
- Verify endpoint is publicly accessible
- Check STRIPE_WEBHOOK_SECRET matches dashboard
- Review webhook logs in Stripe dashboard

### File Upload Fails
- Check R2 credentials in .env
- Verify bucket exists and has write permissions
- Test connection with AWS CLI

---

## Additional Resources

- **FastAPI Docs**: https://fastapi.tiangolo.com/
- **Stripe API**: https://stripe.com/docs/api
- **Cloudflare R2**: https://developers.cloudflare.com/r2/
- **Project Context**: See `CLAUDE.md` and `PRD.md`

---

**Last Updated**: December 18, 2024
**Version**: 1.0.0
**Maintainer**: LOAF Development Team