# nginx server config for the static site, baked into the image.
# Base image: nginxinc/nginx-unprivileged (runs as uid 101, listens on 8080).
# Read-only rootfs in k8s: /tmp and /var/cache/nginx are emptyDir mounts.

server {
    listen       8080;
    server_name  _;
    root         /usr/share/nginx/html;
    index        index.html;

    # Don't leak the nginx version.
    server_tokens off;

    # ---- Security headers (origin) -------------------------------------------
    # These travel with the artifact. HSTS + HTTPS redirect are set at the
    # Cloudflare edge (the tunnel terminates TLS), so they are NOT set here.
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=(), interest-cohort=()" always;

    # ---- Content-Security-Policy ---------------------------------------------
    # FILLED IN M4: Astro computes the inline script/style hashes at build; the
    # final policy is emitted here as a header (a <meta> CSP can't set
    # frame-ancestors). Until then, a conservative baseline:
    add_header Content-Security-Policy "default-src 'self'; img-src 'self' data:; font-src 'self'; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'" always;

    # ---- Caching -------------------------------------------------------------
    # Astro emits content-hashed assets under /_astro/ — cache them hard.
    location /_astro/ {
        expires 1y;
        add_header Cache-Control "public, immutable" always;
    }

    # HTML is revalidated so deploys show up immediately.
    location ~* \.html$ {
        add_header Cache-Control "no-cache" always;
    }

    # ---- Routing -------------------------------------------------------------
    location / {
        try_files $uri $uri/ $uri.html =404;
    }

    error_page 404 /404.html;
    location = /404.html {
        internal;
    }

    # Compression
    gzip on;
    gzip_comp_level 6;
    gzip_min_length 1024;
    gzip_types text/plain text/css application/javascript application/json image/svg+xml application/xml application/rss+xml;
    gzip_vary on;
}