map $http_upgrade $guacamole_connection_upgrade {
    default upgrade;
    '' close;
}

server {
    listen 80;
    server_name ${EXTERNAL_GUACAMOLE_DOMAIN};

    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }

    location / {
        return 301 https://$host$request_uri;
    }
}

server {
    listen 443 ssl;
    http2 on;
    server_name ${EXTERNAL_GUACAMOLE_DOMAIN};

    ssl_certificate /etc/nginx/ssl/${SSL_CERTIFICATE_FILE};
    ssl_certificate_key /etc/nginx/ssl/${SSL_CERTIFICATE_KEY_FILE};
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 1d;
    ssl_session_tickets off;
    ssl_protocols TLSv1.2 TLSv1.3;

    client_max_body_size 1g;

    add_header Strict-Transport-Security "max-age=31536000" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;

    location / {
        # Serve Guacamole at the domain root while retaining its native
        # /guacamole/ context path on the internal Tomcat service.
        proxy_pass ${EXTERNAL_GUACAMOLE_UPSTREAM}/guacamole/;
        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-Host $host;
        proxy_set_header X-Forwarded-Proto https;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $guacamole_connection_upgrade;
        proxy_connect_timeout 30s;
        proxy_send_timeout 30m;
        proxy_read_timeout 30m;
        proxy_request_buffering off;
        proxy_buffering off;
    }
}