# Lab entry point. Deployed on the lab host as
#   /etc/nginx/sites-available/keycloak-lab
# and symlinked from sites-enabled/.
#
# Arch does not ship the Debian sites-available convention, so nginx.conf needs
#   include /etc/nginx/sites-enabled/*;
# inside its http { } block before this file has any effect.
#
# This is the outer of two L7 hops. It terminates TLS and hands plain HTTP to
# the Traefik instance running on each k3s node.

upstream k3s_traefik {
    # Sticky-session switch. Keycloak recommends affinity on AUTH_SESSION_ID;
    # ip_hash is the cheap stand-in for a single-browser lab. Leaving it off is
    # the interesting case: Infinispan still routes correctly, only slower.
    # ip_hash;
    server 192.168.122.11:80;
    server 192.168.122.12:80;
}

server {
    listen 80 default_server;
    server_name _;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl default_server;
    http2 on;
    server_name _;

    # fullchain.pem, never cert.pem: omitting the intermediates passes on
    # desktop browsers and fails on mobile and curl.
    ssl_certificate     /etc/letsencrypt/live/auth.hyeonworks.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/auth.hyeonworks.com/privkey.pem;
    ssl_protocols       TLSv1.2 TLSv1.3;

    location / {
        proxy_pass http://k3s_traefik;
        proxy_http_version 1.1;

        proxy_set_header Host              $host;
        proxy_set_header X-Forwarded-Host  $host;
        proxy_set_header X-Forwarded-Proto https;
        proxy_set_header X-Forwarded-Port  443;

        # $remote_addr, not $proxy_add_x_forwarded_for. This is the trust
        # boundary: a client-supplied X-Forwarded-For must be discarded, not
        # extended, or nothing downstream can rely on the value.
        proxy_set_header X-Forwarded-For   $remote_addr;
        proxy_set_header X-Real-IP         $remote_addr;

        proxy_read_timeout 3600s;
        proxy_send_timeout 3600s;
    }
}