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(define-module (webid-oidc jti)
#:use-module (ice-9 atomic)
#:use-module (ice-9 threads)
#:use-module (srfi srfi-19))
(define-public (make-jti-list)
(make-atomic-box '()))
(define-public (lookup list jti)
(if (null? list)
#f
(or (string=? (assq-ref (car list) 'jti) jti)
(lookup (cdr list) jti))))
(define-public (jti-check current-time jti list valid-time)
(when (date? current-time)
(set! current-time (date->time-utc current-time)))
(when (time? current-time)
(set! current-time (time-second current-time)))
(let* ((old (atomic-box-ref list))
(new-entry `((exp . ,(+ current-time valid-time))
(jti . ,jti)))
(new (filter
(lambda (entry)
(let ((exp (assq-ref entry 'exp)))
(>= exp current-time)))
(cons new-entry old))))
(let ((present? (lookup old jti)))
(if present?
#f
(let ((discarded (atomic-box-compare-and-swap! list old new)))
(if (eq? discarded old)
#t
(jti-check current-time jti list valid-time)))))))
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