server {
    listen 80;
    root /usr/share/nginx/html;
    
    # TLS termination should be handled by a reverse proxy (e.g. Traefik)

    # General security headers
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;

    # Block access to dotfiles
    location ~ /\.(?!well-known) {
        deny all;
        access_log off;
        log_not_found off;
    }

    # Enable gzip compression for all assets
    gzip              on;
    gzip_vary         on;
    gzip_proxied      any;
    gzip_comp_level   6;
    gzip_types        text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;

    location /api {
        proxy_pass http://qnote-server:8080; # Internal Docker DNS
        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;
    }

    location / {
        try_files $uri $uri/ /index.html;

        # Cache static assets
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
            expires 7d;
            add_header Cache-Control "public, no-transform";
        }
    }

    # Route 404 errors to front page
    error_page 404 /;
}