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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 provider-confirmation)
#:use-module (webid-oidc errors)
#:use-module (webid-oidc fetch)
#:use-module (web uri)
#:use-module (web client)
#:use-module (web response)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-19)
#:use-module (ice-9 receive)
#:use-module (ice-9 optargs)
#:use-module (rdf rdf)
#:use-module (turtle tordf))
(define (find-confirmations subject graph)
(cond ((null? graph) '())
((and (string=? (rdf-triple-predicate (car graph))
"http://www.w3.org/ns/solid/terms#oidcIssuer")
(string? (rdf-triple-subject (car graph)))
(string=? (rdf-triple-subject (car graph)) subject)
(string? (rdf-triple-object (car graph)))
(string->uri (rdf-triple-object (car graph)))
(eq? (uri-scheme (string->uri (rdf-triple-object (car graph))))
'https))
(cons (string->uri (rdf-triple-object (car graph)))
(find-confirmations subject (cdr graph))))
(else (find-confirmations subject (cdr graph)))))
(define (serve-confirmations expiration-date subject cnf)
(let ((resource (format #f "@prefix solid: <http://www.w3.org/ns/solid/terms#> .
<~a> solid:oidcIssuer ~a .
"
(uri->string subject)
(string-join (map (lambda (uri)
(format #f "<~a>" (uri->string uri)))
cnf)
", "))))
(values (build-response #:headers `((content-type text/turtle)
(expires . ,expiration-date)))
resource)))
(define*-public (get-provider-confirmations subject
#:key
(http-get http-get))
(unless (equal? (uri-scheme subject) 'https)
(set! subject (build-uri 'https
#:userinfo (uri-userinfo subject)
#:host (uri-host subject)
#:port (uri-port subject)
#:path (uri-path subject)
#:query (uri-query subject)
#:fragment (uri-fragment subject))))
(let ((graph (fetch subject #:http-get http-get)))
(cons (build-uri 'https
#:userinfo (uri-userinfo subject)
#:host (uri-host subject)
#:port (uri-port subject))
(find-confirmations (uri->string subject) graph))))
(define*-public (confirm-provider subject issuer
#:key (http-get http-get))
(define (search lst)
(if (null? lst)
(raise-unconfirmed-provider subject issuer)
(or (string=? (car lst) (uri->string issuer))
(search (cdr lst)))))
(unless (string=? (uri-host subject) (uri-host issuer))
(search (get-provider-confirmations
subject
#:http-get http-get))))
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