# Include these locations inside the HTTPS server that publishes /dwh/.
# The verifier is deliberately reachable only through an internal subrequest.
location = /_check_dwh_key {
    internal;
    proxy_method GET;
    proxy_pass http://unix:/run/dwh-auth/verify.sock:/verify;
    proxy_pass_request_body off;
    proxy_pass_request_headers off;
    proxy_set_header Content-Length "";
    proxy_set_header X-API-Key $http_x_api_key;
}

location @dwh_auth_unavailable {
    return 503;
}

location /dwh/ {
    limit_req zone=dwh_auth burst=100 nodelay;
    auth_request /_check_dwh_key;
    # Capture the verifier public ID only for an optional sanitized access log.
    auth_request_set $dwh_key_id $upstream_http_x_dwh_key_id;
    error_page 500 =503 @dwh_auth_unavailable;

    # Never forward the credential or verifier identity to the upstream.
    proxy_set_header X-API-Key "";
    # The public ID remains available only to an explicitly sanitized log.
    proxy_set_header X-DWH-Key-ID "";
    proxy_set_header Host $host;
    proxy_pass http://127.0.0.1:3001/;
}