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;; disfluid, 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 server update)
#:use-module (webid-oidc errors)
#:use-module (webid-oidc server resource path)
#:use-module (webid-oidc server resource content)
#:use-module (webid-oidc server precondition)
#:use-module (webid-oidc server create) ;; for &unsupported-media-type
#: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 ((webid-oidc parameters) #:prefix p:)
#:use-module (web uri)
#: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 (ice-9 hash-table)
#:use-module (rnrs bytevectors)
#:use-module (oop goops)
#:declarative? #t
#:export
(
update
))
(define (remove-containment-triples doc-uri content-type content)
(case content-type
((text/turtle)
#t)
(else
(raise-exception
(make-exception
(make-unsupported-media-type content-type)))))
(let ((graph
(parameterize
((p:anonymous-http-request
(lambda (uri . args)
(values
(build-response #:headers `((content-type ,content-type)))
content))))
(fetch doc-uri))))
(with-index
graph
(lambda (rdf-match)
(let ((containment-triples
(rdf-match (uri->string doc-uri)
"http://www.w3.org/ns/auth/acl#contains"
#f)))
(let ((blacklist
(alist->hash-table
(map (lambda (t)
(cons t #t))
containment-triples))))
(let ((not-blacklisted?
(lambda (t)
(not
(hash-ref blacklist t #f)))))
(let ((final-graph
(filter not-blacklisted? graph)))
(if (null? containment-triples)
content
(rdf->turtle final-graph))))))))))
(define* (update server-name owner user path if-match if-none-match
content-type content)
(define updated-etag #f)
(with-session
(lambda (load-content-type load-contained load-static-content
do-create do-delete)
(receive (base-path path-type)
(base-path path)
(update-path
base-path
(lambda (main-etag auxiliary)
(let ((relevant-etag
(if path-type
(assoc-ref auxiliary path-type)
main-etag)))
(if relevant-etag
;; The resource exists, so we need write permission
(check-acl-can-write server-name path owner user)
;; The resource does not exist yet, so we only need
;; append permission
(check-acl-can-append server-name path owner user))
(check-precondition path if-match if-none-match relevant-etag)
(set! updated-etag
(do-create content-type
(if relevant-etag
(load-contained relevant-etag)
(if (container-path? path)
'()
#f))
(if (container-path? path)
(remove-containment-triples
(build-uri (uri-scheme server-name)
#:userinfo (uri-userinfo server-name)
#:host (uri-host server-name)
#:port (uri-port server-name)
#:path path)
content-type content)
content)))
(let ((new-main-etag
(if path-type
main-etag
updated-etag))
(new-auxiliary
(if path-type
(cons
`(,path-type . ,updated-etag)
(filter
(lambda (auxiliary)
(let ((needs-description? (not (eq? content-type 'text/turtle)))
(is-describedby?
(equal?
(car auxiliary)
(string->uri
"https://www.w3.org/ns/iana/link-relations/relation#describedby")))
(is-path-type?
(equal? (car auxiliary) path-type)))
(and (not is-path-type?)
(or (not is-describedby?) needs-description?))))
(or auxiliary '())))
(if (eq? content-type 'text/turtle)
(or auxiliary '())
(cons
`(,(string->uri
"https://www.w3.org/ns/iana/link-relations/relation#describedby")
. ,(do-create 'text/turtle #f ""))
(or auxiliary '()))))))
(unless new-main-etag
;; Trying to update an auxiliary resource for a
;; resource that does not exist
(set! new-main-etag
(do-create 'text/turtle
(if (container-path? path)
'()
#f)
"")))
(values new-main-etag new-auxiliary))))
load-content-type load-contained load-static-content do-create do-delete
#:create-intermediate-containers? #t))))
updated-etag)
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