#lang syndicate
;;; SPDX-License-Identifier: LGPL-3.0-or-later
;;; SPDX-FileCopyrightText: Copyright © 2021 Tony Garnock-Jones <tonyg@leastfixedpoint.com>

(require (only-in sha bytes->hex-string))

(require (only-in racket/list append-map))

(require syndicate/relay)
(require syndicate/rewrite)
(require syndicate/sturdy)
(require syndicate/schemas/gen/gatekeeper)
(require syndicate/sturdy)
(require syndicate/drivers/tcp)

(module+ main
  (standard-actor-system (ds)
    (define ds-oid "syndicate")
    (define ds-key (make-bytes KEY_LENGTH))
    (at ds (assert (Bind ds-oid ds-key ds)))

    (define root-cap (mint ds-oid ds-key))
    (write-preserve/text (->preserve root-cap) #:indent 4 #:commas? #f)
    (newline)
    (displayln (bytes->hex-string (sturdy-encode (->preserve root-cap))))

    (define spec (TcpLocal "0.0.0.0" 5999))
    (at ds
      (stop-on (asserted (TcpListenError spec _)))
      (during/spawn (StreamConnection $source $sink spec)
        #:name (list 'tcp-server source)
        (run-relay #:packet-writer (lambda (bs) (send-data sink bs))
                   #:setup-inputs
                   (lambda (tr)
                     (handle-connection source sink
                                        #:on-data (lambda (d _m) (accept-bytes tr d))))
                   #:initial-ref
                   (object #:name 'gatekeeper
                           [(Resolve unvalidated-sturdyref observer)
                            (at ds
                              (during (Bind (SturdyRef-oid unvalidated-sturdyref) $key $target)
                                (define sturdyref (validate unvalidated-sturdyref key))
                                (define attenuation
                                  (append-map Attenuation-value
                                              (reverse (SturdyRef-caveatChain sturdyref))))
                                (define attenuated-target
                                  (apply attenuate-entity-ref target attenuation))
                                (at observer (assert (embedded attenuated-target)))))]))))))