# Nginx reverse proxy for bal-server
# Place this file in /etc/nginx/sites-available/ and symlink to sites-enabled
# Replace BAL_DOMAIN with your actual domain

# HTTP redirect to HTTPS
server {
    listen 80;
    listen [::]:80;
    server_name BAL_DOMAIN;
    return 301 https://$server_name$request_uri;
}

# HTTPS proxy to bal-server (localhost only)
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name BAL_DOMAIN;

    # Let's Encrypt certificates (managed by certbot)
    ssl_certificate /etc/letsencrypt/live/BAL_DOMAIN/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/BAL_DOMAIN/privkey.pem;

    # Security headers (no HSTS to avoid preloading issues)
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Body size limit — must match Actix PayloadConfig (default 1 MB)
    client_max_body_size 1m;

    # Rate limiting zone (requires `limit_req_zone` in nginx.conf)
    # limit_req zone=bal burst=20 nodelay;
    # limit_conn addr 10;

    # Proxy to bal-server on localhost
    location / {
        proxy_pass http://127.0.0.1:9137;
        proxy_http_version 1.1;

        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        proxy_connect_timeout 5s;
        proxy_send_timeout 10s;
        proxy_read_timeout 30s;
    }

    # Optional: serve public_key.pem directly from Nginx (faster)
    # location /.pub_key.pem {
    #     alias /var/bal/public_key.pem;
    #     add_header Content-Type text/plain;
    # }
}