# rustingface.com — the public face.
#
# A shop window for operators evaluating whether to run their own instance:
# the catalogue, the model cards, and the app are readable by anyone. Weights
# are not. That split is enforced by the service (`auth.mode = "bearer"` with
# `auth.anonymous = "catalog"`), not by this file — nginx here is defence in
# depth, and the two must not be allowed to disagree.
#
# Installed on hanzalova, whose WAN address is nh.thgttg.com. TCP :443 belongs
# to the stream SNI router, so this listens on the https tier behind it.
#
# Public name => Let's Encrypt (external-tls.md). The mesh name rf.internal is
# a separate vhost with an internal-CA cert, sharing this webroot and upstream
# (reverse-proxies.md §2).

server {
    listen 127.0.0.1:14443 ssl proxy_protocol;
    http2 on;
    server_name rustingface.com www.rustingface.com;

    ssl_certificate     /etc/letsencrypt/live/rustingface.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/rustingface.com/privkey.pem;
    ssl_protocols       TLSv1.2 TLSv1.3;

    root /var/www/rustingface;
    index index.html;

    absolute_redirect off;

    access_log /var/log/nginx/rustingface.com.access.log;
    error_log  /var/log/nginx/rustingface.com.error.log;

    # A public origin gets the headers a public origin needs. The app loads
    # nothing cross-origin, so the policy can be tight.
    add_header X-Content-Type-Options    "nosniff"          always;
    add_header X-Frame-Options           "DENY"             always;
    add_header Referrer-Policy           "no-referrer"      always;
    add_header Strict-Transport-Security "max-age=31536000" always;

    proxy_http_version 1.1;
    proxy_set_header Host              $host;
    proxy_set_header Connection        "";
    proxy_set_header X-Real-IP         $proxy_protocol_addr;
    proxy_set_header X-Forwarded-For   $proxy_protocol_addr;
    proxy_set_header X-Forwarded-Proto https;
    proxy_set_header Accept-Encoding   $http_accept_encoding;

    proxy_buffering         off;
    proxy_request_buffering off;
    client_max_body_size    0;
    proxy_connect_timeout   15s;
    proxy_read_timeout      300s;
    proxy_send_timeout      300s;

    # --- never public ------------------------------------------------------

    # /metrics is exempt from the service's own auth so a mesh Prometheus can
    # scrape it without a credential. That exemption is fine on rf.internal
    # and unacceptable here, so the public vhost closes it explicitly rather
    # than relying on the service to.
    location = /metrics { return 404; }

    # --- the service -------------------------------------------------------

    # Reachable, but the service answers 401 without a token. Published so a
    # token holder can pull from anywhere, and so an anonymous client gets a
    # 401 it can act on rather than a 404 that reads as "no such model".
    location ^~ /api/ { proxy_pass http://rustingface; }
    location ^~ /v1/  { proxy_pass http://rustingface; }
    location ~ /resolve/ { proxy_pass http://rustingface; }

    location = /healthz { proxy_pass http://rustingface; }

    # --- the app -----------------------------------------------------------

    location /assets/ {
        gzip_static on;
        add_header Cache-Control "public, max-age=31536000, immutable";
    }

    location = /index.html {
        add_header Cache-Control "no-cache";
    }

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

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