#!/usr/bin/env bash

# Create nginx configuration for reverse proxy to Node.js app
cat > /etc/nginx/conf.d/default.conf << EOF
upstream nodejs_backend {
    server 127.0.0.1:3000;
}

server {
    listen 80;
    server_name $domain $serveralias;
    
    # Redirect HTTP to HTTPS
    return 301 https://\$server_name\$request_uri;
}

server {
    listen 443 ssl;
    http2 on;
    server_name $domain $serveralias;
    
    ssl_certificate /etc/pki/tls/certs/localhost.crt;
    ssl_certificate_key /etc/pki/tls/private/localhost.key;
    
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384;
    
    access_log /home/$user/logs/nginx/access.log;
    error_log /home/$user/logs/nginx/error.log;
    
    location / {
        proxy_pass http://nodejs_backend;
        proxy_http_version 1.1;

        # WebSocket support (socket.io, ws). \$connection_upgrade is defined by
        # the map in /etc/nginx/nginx.conf: 'upgrade' when the client asked to
        # upgrade, 'close' otherwise -- a hardcoded 'upgrade' would send the
        # header on every ordinary request too.
        proxy_set_header Upgrade \$http_upgrade;
        proxy_set_header Connection \$connection_upgrade;

        # An idle WebSocket sends no bytes, and the default 60s read timeout
        # would cut it. 600s clears any sane heartbeat (socket.io pings every
        # 25s by default) without pinning connection slots for an hour --
        # worker_connections is 512 and each client uses two.
        proxy_read_timeout 600s;
        proxy_send_timeout 600s;

        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 \$http_x_forwarded_proto;
        proxy_set_header X-CLIENT-IP \$http_x_client_ip;
        proxy_cache_bypass \$http_upgrade;
    }
    
    location /ping {
        proxy_pass http://nodejs_backend/ping;
        access_log off;
    }
    
    # Static files
    location /static/ {
        alias /home/$user/app/public/;
        expires 30d;
        add_header Cache-Control "public, immutable";
    }
}
EOF