#!/usr/bin/env bash
# Generate a standard SSL reverse proxy server block for NAME and backend HOST:PORT.
set -euo pipefail
name="${1:-}"; backend="${2:-127.0.0.1:8000}"
[[ -n "$name" ]] || { echo "Usage: mknginx-sni.sh NAME [BACKEND_HOST:PORT]"; exit 2; }

cat >/etc/nginx/conf.d/"$name".conf <<NGINX
upstream ${name//./_}_app { server $backend; keepalive 32; }

server {
    listen 80;
    server_name $name;
    return 301 https://\$host\$request_uri;
}

server {
    listen 443 ssl http2;
    server_name $name;

    ssl_certificate     /etc/nginx/ssl/$name.crt;
    ssl_certificate_key /etc/nginx/ssl/$name.key;

    client_max_body_size 100m;

    location / {
        proxy_pass http://${name//./_}_app;
        proxy_http_version 1.1;
        proxy_set_header Host \$host;
        proxy_set_header X-Forwarded-Proto https;
        proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
        proxy_set_header Upgrade \$http_upgrade;
        proxy_set_header Connection \$connection_upgrade;
    }
}

map \$http_upgrade \$connection_upgrade {
    default upgrade;
    ''      close;
}
NGINX

nginx -t && systemctl reload nginx
echo "/etc/nginx/conf.d/$name.conf written"