geo $realip_remote_addr $ingress_peer_trusted {
  default 0;
  192.0.2.1/32 1;
  2001:db8::1/128 1;
}
real_ip_header X-Forwarded-For;
real_ip_recursive off;
set_real_ip_from 192.0.2.1/32;
set_real_ip_from 2001:db8::1/128;

server {
  listen 80 default_server;
  server_name "";

  location = /health {
    access_log off;
    default_type text/plain;
    return 200 "ok\n";
  }

  location / {
    return 444;
  }
}

server {
  listen 80;
  server_name jobs.example.test;

  if ($ingress_peer_trusted = 0) { return 403; }
  if ($http_x_forwarded_proto != "https") { return 400; }
  if ($http_x_forwarded_for = "") { return 400; }
  if ($http_x_forwarded_for ~ ",") { return 400; }
  # A malformed address is not forwarded verbatim: realip leaves the socket IP intact.

  add_header X-Content-Type-Options "nosniff" always;
  add_header X-Frame-Options "DENY" always;
  add_header Referrer-Policy "strict-origin-when-cross-origin" always;
  add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;

  root /usr/share/nginx/html;
  index index.html;

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

  location = /health {
    proxy_pass http://backend-web:8080/health;
    proxy_http_version 1.1;

    proxy_set_header Host jobs.example.test;
    proxy_set_header X-Real-IP $remote_addr;
    # realip resolves one sanitized address only from an explicitly trusted socket peer.
    proxy_set_header X-Forwarded-For $remote_addr;
    proxy_set_header X-Forwarded-Proto https;
    proxy_set_header X-Forwarded-Host "";
    proxy_set_header Forwarded "";
  }

  location = /ready {
    proxy_pass http://backend-web:8080/ready;
    proxy_http_version 1.1;

    proxy_set_header Host jobs.example.test;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $remote_addr;
    proxy_set_header X-Forwarded-Proto https;
    proxy_set_header X-Forwarded-Host "";
    proxy_set_header Forwarded "";
  }

  location /api/ {
    proxy_pass http://backend-web:8080;
    proxy_http_version 1.1;

    proxy_set_header Host jobs.example.test;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $remote_addr;
    proxy_set_header X-Forwarded-Proto https;
    proxy_set_header X-Forwarded-Host "";
    proxy_set_header Forwarded "";
  }
}