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;; disfluid, implementation of the Solid specification
;; Copyright (C) 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 serve)
#:use-module (webid-oidc errors)
#:use-module (webid-oidc fetch)
#:use-module (webid-oidc web-i18n)
#:use-module ((webid-oidc parameters) #:prefix p:)
#:use-module (ice-9 optargs)
#:use-module (ice-9 receive)
#:use-module (ice-9 exceptions)
#:use-module (rnrs bytevectors)
#:use-module (web request)
#:use-module (web response)
#:use-module (web uri)
#:use-module (rdf rdf)
#:use-module (turtle fromrdf)
#:use-module (nquads fromrdf)
#:use-module (json)
#:use-module (jsonld)
#:declarative? #t
#:export
(
¬-acceptable
make-not-acceptable
not-acceptable?
not-acceptable-client-accepts
not-acceptable-path
not-acceptable-content-type
convert
))
(define-exception-type
¬-acceptable
&external-error
make-not-acceptable
not-acceptable?
(client-accepts not-acceptable-client-accepts)
(path not-acceptable-path)
(content-type not-acceptable-content-type))
(define (convert client-accepts server-name path content-type content)
(let ((data-as-rdf
(false-if-exception
(parameterize
((p:anonymous-http-request
(lambda _
(values (build-response
#:headers `((content-type ,content-type)))
content))))
(fetch
(build-uri (uri-scheme server-name)
#:userinfo (uri-userinfo server-name)
#:host (uri-host server-name)
#:port (uri-port server-name)
#:path path))))))
(if client-accepts
;; Content negociation is asked
(let try-satisfy ((accepts client-accepts))
(if (null? accepts)
(let ((final-message
(format #f (G_ "content negociation failed while serving a request"))))
(raise-exception
(make-exception
(make-not-acceptable client-accepts path content-type)
(make-exception-with-message final-message))))
(let ((request (car accepts)))
(cond
((or (eq? request content-type)
(eq? request '*/*))
(values content-type content))
((and (eq? request 'text/turtle) data-as-rdf)
(values 'text/turtle
(rdf->turtle data-as-rdf)))
((and (or (eq? request 'application/n-quads)
(eq? request 'text/x-nquads))
data-as-rdf)
(values request
(rdf->nquads
(make-rdf-dataset data-as-rdf '()))))
((and (eq? request 'application/ld+json) data-as-rdf)
(values 'application/ld+json
(scm->json-string
(rdf->jsonld
(make-rdf-dataset data-as-rdf '())))))
;; Add other conversion strategies here
(else
(try-satisfy (cdr accepts)))))))
;; Content negociation is unwanted
(values content-type content))))
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