# /etc/nginx/sites-available/jqc_multi
# ─────────────────────────────────────────────────────────────────────────────
# Tenant subdomains: *.jqc.app → 127.0.0.1:8000
#
# MT-24. The critical line in this file is:
#
#     proxy_set_header X-Forwarded-Host $host;
#
# Nginx forwards unrecognised client request headers upstream. Without this
# line a client could send its own X-Forwarded-Host, and (when the app trusted
# it) choose which tenant database the request bound to — pre-authentication,
# from the open internet. Pinning it to $host makes the header say what nginx
# observed, never what the client claimed. The app no longer trusts the header
# at all (ProxyFix x_host=0), so this is the second of two independent layers.
#
# Keep both. Either alone closes the hole; both together mean a future change
# to one does not silently reopen it.
# ─────────────────────────────────────────────────────────────────────────────

# ── Shared proxy header set ──────────────────────────────────────────────────
# Included by every location that proxies, so a new location cannot forget one.
# (Requires: include snippets in /etc/nginx/snippets/ or inline as below.)

server {
    listen 443 ssl;
    http2 on;
    server_name *.jqc.app;

    client_max_body_size 50M;

    # Static assets. NOTE: this serves the app's static tree directly, which
    # includes app/static/uploads on a local-storage deploy — every photo is
    # then readable by anyone who knows or guesses its URL, with no session
    # check. Filenames are random UUIDs so they are not enumerable, but they
    # are also not access-controlled and never expire.
    # This is retired per tenant at R2 cutover, when media moves to short-lived
    # presigned URLs. Until then, treat it as a known exposure.
    location /static/ {
        alias /home/jqc/janitorial_qc/app/static/;
        expires 30d;
    }

    location / {
        proxy_pass         http://127.0.0.1:8000;

        proxy_set_header   Host              $host;
        # MT-24 — pin, never inherit from the client. See header comment.
        proxy_set_header   X-Forwarded-Host  $host;
        proxy_set_header   X-Forwarded-Port  $server_port;
        proxy_set_header   X-Real-IP         $remote_addr;
        proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
        proxy_set_header   X-Forwarded-Proto $scheme;

        proxy_read_timeout 60s;
    }

    ssl_certificate     /etc/letsencrypt/live/jqc.app-0001/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/jqc.app-0001/privkey.pem;
    include             /etc/letsencrypt/options-ssl-nginx.conf;
    ssl_dhparam         /etc/letsencrypt/ssl-dhparams.pem;
}

server {
    listen 80;
    server_name *.jqc.app;

    # MT-24: the Certbot-generated `if ($host = *.jqc.app)` test is a literal
    # string comparison — it never matches a wildcard server_name, so plain
    # HTTP requests to tenant subdomains fell through with no redirect. This
    # block matches only *.jqc.app already, so redirect unconditionally.
    return 301 https://$host$request_uri;
}