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(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 (check-mode server-name path owner user http-get expected-mode)
(let ((modes (wac-get-modes server-name path user #:http-get http-get)))
(define (check-modes modes)
(if (null? modes)
(raise-exception
(make-forbidden path user owner expected-mode))
(or
(equal? (car modes) expected-mode)
(check-modes (cdr modes)))))
(check-modes modes)))
(define (check-acl-can-read server-name path owner user http-get)
(check-mode server-name path owner user http-get
(string->uri "http://www.w3.org/ns/auth/acl#Read")))
(define (check-acl-can-control server-name path owner user http-get)
(check-mode server-name path owner user http-get
(string->uri "http://www.w3.org/ns/auth/acl#Control")))
(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)
(let ((acl? (string-suffix? ".acl" path))
(description? (string-suffix? ".meta" path))
(base-path
(cond
((string-suffix? ".acl" path)
(substring path 0 (- (string-length path) (string-length ".acl"))))
((string-suffix? ".meta" path)
(substring path 0 (- (string-length path) (string-length ".meta"))))
(else path)))
(container? (string-suffix? path "/"))
(root? (equal? path "/")))
(unless (equal? user owner)
(if acl?
(check-acl-can-control server-name base-path owner user http-get)
(check-acl-can-read server-name path owner user http-get)))
(receive (main-etag auxiliary)
(read-path base-path)
(let ((relevant-etag
(cond
(acl?
(assoc-ref auxiliary
(string->uri "http://www.w3.org/ns/auth/acl#accessControl")))
(description?
(assoc-ref auxiliary
(string->uri "https://www.w3.org/ns/iana/link-relations/relation#describedby")))
(else
main-etag)))
(non-rdf? (not (eq? (load-content-type main-etag) 'text/turtle)))
(auxiliary? (or acl? description?))
(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
(cond
(acl?
(assoc-ref auxiliary
(string->uri "http://www.w3.org/ns/auth/acl#accessControl")))
(description?
(assoc-ref auxiliary
(string->uri "https://www.w3.org/ns/iana/link-relations/relation#describedby")))))))
(let ((description (and non-rdf? (string-append path ".meta")))
(accept-put (if (or container? auxiliary?) "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 (not acl?)
(cons
(build-uri
'https
#:userinfo (uri-userinfo server-name)
#:host (uri-host server-name)
#:port (uri-port server-name)
#:path (string-append path ".acl"))
'((rel . "acl")))))
(describedby
(and non-rdf?
(cons
(build-uri
'https
#:userinfo (uri-userinfo server-name)
#:host (uri-host server-name)
#:port (uri-port server-name)
#:path (string-append path ".acl"))
'((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 (string-append path ".acl"))
'((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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