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;; webid-oidc, implementation of the Solid specification
;; Copyright (C) 2020, 2021 Vivien Kraus
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU Affero General Public License as
;; published by the Free Software Foundation, either version 3 of the
;; License, or (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU Affero General Public License for more details.
;; You should have received a copy of the GNU Affero General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
(define-module (webid-oidc jti)
#:use-module ((webid-oidc parameters) #:prefix p:)
#:use-module (ice-9 atomic)
#:use-module (ice-9 threads)
#:use-module (ice-9 match)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-19)
#:export (jti-check))
(define jti-list
(make-atomic-box '()))
(define-record-type <jti-item>
(make-jti-item exp jti)
jti-item?
(exp jti-item-exp)
(jti jti-item-jti))
(define lookup
(match-lambda*
((() item) #f)
(((($ <jti-item> exp jti) other ...) item)
(or (string=? jti item)
(lookup other item)))))
(define (jti-check jti valid-time)
(let* ((current-time
(time-second (date->time-utc ((p:current-date)))))
(old (atomic-box-ref jti-list))
(new-entry (make-jti-item (+ current-time valid-time) jti))
(new (filter
(match-lambda
(($ <jti-item> exp other-jti)
(>= exp current-time)))
(cons new-entry old))))
(and (not (lookup old jti))
(let ((discarded (atomic-box-compare-and-swap! jti-list old new)))
(if (eq? discarded old)
#t
(jti-check jti valid-time))))))
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