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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 server read)
#: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
(
read
))
(define* (read server-name owner user path
#:key
(http-get http-get))
(declare-link-header!)
(with-session
(lambda (load-content-type load-contained load-static-content
do-create do-delete)
(check-acl-can-read server-name path owner user #:http-get http-get)
(receive (base-path path-type)
(base-path path)
(let ((container? (container-path? path))
(root? (root-path? path))
(acl?
(equal? path-type
(string->uri
"http://www.w3.org/ns/auth/acl#accessControl")))
(description?
(equal?
path-type
(string->uri
"https://www.w3.org/ns/iana/link-relations/relation#describedby"))))
(receive (main-etag auxiliary)
(read-path base-path)
(let ((relevant-etag
(if path-type
(assoc-ref auxiliary path-type)
main-etag))
(needs-meta?
(case (load-content-type main-etag)
((text/turtle)
#f)
(else #t)))
(needs-acl?
(not acl?))
(allow (cond (root? '(GET HEAD OPTIONS POST PUT))
(container? '(GET HEAD OPTIONS POST PUT DELETE))
(else '(GET HEAD OPTIONS PUT DELETE)))))
(unless relevant-etag
(raise-exception
(make-auxiliary-resource-absent base-path path-type)))
(let ((accept-put (if (or container? path-type) "text/turtle" "*/*")))
(values
;; Headers
(let ((links
(let ((type
(cons
(if container?
(string->uri "http://www.w3.org/ns/ldp#BasicContainer")
(string->uri "http://www.w3.org/ns/ldp#Resource"))
'((rel . "type"))))
(acl
(and needs-acl?
(cons
(build-uri
'https
#:userinfo (uri-userinfo server-name)
#:host (uri-host server-name)
#:port (uri-port server-name)
#:path (derive-path
base-path
(string->uri
"http://www.w3.org/ns/auth/acl#accessControl")))
'((rel . "acl")))))
(describedby
(and needs-meta?
(cons
(build-uri
'https
#:userinfo (uri-userinfo server-name)
#:host (uri-host server-name)
#:port (uri-port server-name)
#:path (derive-path
base-path
(string->uri
"https://www.w3.org/ns/iana/link-relations/relation#describedby")))
'((rel . "describedby")))))
(describes
(and description?
(cons
(build-uri
'https
#:userinfo (uri-userinfo server-name)
#:host (uri-host server-name)
#:port (uri-port server-name)
#:path base-path)
'((rel . "https://www.w3.org/ns/iana/link-relations/relation#describes")))))
(storage
(and root?
(list
(list
(string->uri "http://www.w3.org/ns/pim/space#Storage")
'(rel . "type"))
(list
owner
'(rel . "http://www.w3.org/ns/solid/terms#owner"))))))
(append
(list type)
(if acl (list acl) '())
(if describedby (list describedby) '())
(if describes (list describes) '())
(or storage '())))))
`((link . ,links)
(allow . ,allow)
(accept-put . ,accept-put)
(content-type
. (,(if container?
'text/turtle
(load-content-type relevant-etag))))
(etag . (,relevant-etag . #f))))
;; Content
(if container?
(let ((static-graph
(fetch
(build-uri
'https
#:userinfo (uri-userinfo server-name)
#:host (uri-host server-name)
#:port (uri-port server-name)
#:path path)
#:http-get
(lambda (uri . args)
(values
(build-response
#:headers `((content-type ,(load-content-type relevant-etag))))
(load-static-content relevant-etag))))))
(let ((final-graph
(reverse
(append
(map (lambda (contained-path)
(make-rdf-triple
(uri->string
(build-uri
'https
#:userinfo (uri-userinfo server-name)
#:host (uri-host server-name)
#:port (uri-port server-name)
#:path path))
"http://www.w3.org/ns/ldp#contains"
(uri->string
(build-uri
'https
#:userinfo (uri-userinfo server-name)
#:host (uri-host server-name)
#:port (uri-port server-name)
#:path contained-path))))
(load-contained relevant-etag))
static-graph))))
(rdf->turtle final-graph)))
(load-static-content relevant-etag)))))))))))
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