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(define-module (webid-oidc server precondition)
#:use-module (webid-oidc errors)
#:use-module (webid-oidc server resource path)
#:use-module (webid-oidc server resource content)
#:use-module (webid-oidc cache)
#:use-module (webid-oidc fetch)
#:use-module (webid-oidc http-link)
#:use-module (webid-oidc server resource wac)
#:use-module ((webid-oidc stubs) #:prefix stubs:)
#:use-module (webid-oidc rdf-index)
#:use-module ((webid-oidc refresh-token) #:prefix refresh:)
#:use-module (web uri)
#:use-module (web client)
#:use-module (web response)
#:use-module (rdf rdf)
#:use-module (turtle tordf)
#:use-module (turtle fromrdf)
#:use-module (rnrs bytevectors)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 receive)
#:use-module (ice-9 optargs)
#:use-module (ice-9 iconv)
#:use-module (ice-9 textual-ports)
#:use-module (ice-9 binary-ports)
#:use-module (ice-9 threads)
#:use-module (rnrs bytevectors)
#:use-module (oop goops)
#:export
(
check-precondition
))
(define (the-etag object)
;; Sometimes the user passes a pair as an etag (just like what
;; request-if-match may return).
(if (pair? object)
(car object)
object))
(define (check-if-match if-match real-etag)
;; if-match is #f if no filter is used
(or (not if-match)
(eq? if-match '*)
(let check-rest ((precondition if-match))
(and (not (null? precondition))
(let ((first (the-etag (car precondition)))
(rest (cdr precondition)))
(or (equal? first real-etag)
(check-rest rest)))))))
(define (check-if-none-match if-none-match real-etag)
;; if-none-match is #f if there is no filter
(or (not if-none-match)
(if (eq? if-none-match '*)
(not real-etag)
;; if-none-match is a list
(let check-rest ((forbidden if-none-match))
(or (null? forbidden)
(let ((first (the-etag (car forbidden)))
(rest (cdr forbidden)))
(and (not (equal? first real-etag))
(check-rest rest))))))))
(define (check-precondition path if-match if-none-match real-etag)
(unless (and (check-if-match if-match real-etag)
(check-if-none-match if-none-match real-etag))
(let ((error
(make-precondition-failed path if-match if-none-match real-etag)))
(unless real-etag
(set! error
(make-exception error (make-path-not-found path))))
(raise-exception error))))
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