# ALTERNATIVE to nginx-direct.example.conf; never enable both for the same host.
# Remote edge -> TLS -> this nginx on the CMS host -> loopback CMS.
# Replace hotel.example/certificate paths and BOTH occurrences of 203.0.113.10/32.
# The example peer is reserved documentation space, so it permits no real edge.
# Requires ngx_http_realip_module. The remote edge MUST overwrite X-Forwarded-For
# with one verified client IP and enforce the public HTTPS/Host configuration.
geo $realip_remote_addr $cms_trusted_edge {
    default 0;
    203.0.113.10/32 1;
}

server {
    listen 443 ssl;
    listen [::]:443 ssl;
    server_name hotel.example;
    if ($host != hotel.example) { return 444; }
    if ($cms_trusted_edge = 0) { return 403; }
    ssl_certificate /etc/letsencrypt/live/hotel.example/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/hotel.example/privkey.pem;
    ssl_protocols TLSv1.2 TLSv1.3;
    client_max_body_size 64m;

    set_real_ip_from 203.0.113.10/32;
    real_ip_header X-Forwarded-For;
    real_ip_recursive off;

    location / {
        proxy_pass http://127.0.0.1:3002;
        proxy_http_version 1.1;
        proxy_set_header Host hotel.example;
        proxy_set_header X-Forwarded-Host hotel.example;
        proxy_set_header X-Forwarded-Proto https;
        proxy_set_header X-Forwarded-Port 443;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header CF-Connecting-IP "";
        proxy_set_header X-Real-Client-IP "";
        proxy_set_header Forwarded "";
        proxy_set_header Connection "";
        proxy_buffering off;
        proxy_read_timeout 300s;
        proxy_cache off;
    }
}

# Cloudflare variant: use this same restricted-edge mode, NOT the direct mode.
# Replace the documentation peer in BOTH geo/set_real_ip_from lists with the
# current verified Cloudflare IPv4 AND IPv6 CIDRs, then change real_ip_header to
# CF-Connecting-IP. Use Full (strict) TLS and review authenticated origin pulls.
# CF-Connecting-IP is still removed before forwarding to the CMS: nginx sends
# only its normalized, trusted result in X-Forwarded-For and X-Real-IP.