# Access log without the client address.
#
# The default format writes $remote_addr and X-Forwarded-For, so a static page
# that needs no personal data at all was storing the IP of everyone who looked
# at it. This format keeps what is useful for operating the site — when, what,
# which status, how big, from where, with what — and drops the one field that
# identifies a person. Data minimisation is cheaper than a retention policy.
log_format noip '[$time_local] "$request" $status $body_bytes_sent '
                '"$http_referer" "$http_user_agent"';

server {
  listen 80;
  access_log /var/log/nginx/access.log noip;
  server_name _;
  root /usr/share/nginx/html;
  index index.html;

  # Hashed asset file names, so they can be cached hard. The HTML is not hashed
  # and must not be, or a redeploy would go unnoticed for a year.
  location /_astro/ {
    add_header Cache-Control "public, max-age=31536000, immutable";
    try_files $uri =404;
  }
  location = /index.html {
    add_header Cache-Control "no-cache";
  }

  # This page loads nothing from anywhere else, so it can say so.
  add_header X-Content-Type-Options "nosniff" always;
  add_header Referrer-Policy "strict-origin-when-cross-origin" always;
  add_header X-Frame-Options "DENY" always;
  add_header Content-Security-Policy "default-src 'self'; img-src 'self' data:; style-src 'self' 'unsafe-inline'; font-src 'self'; connect-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'" always;

  gzip on;
  gzip_types text/css application/javascript image/svg+xml application/json;
  gzip_min_length 1024;

  location / { try_files $uri $uri/ /index.html; }
  error_page 404 /index.html;
}