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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 client-manifest)
#:use-module (webid-oidc errors)
#:use-module (webid-oidc fetch)
#:use-module (webid-oidc web-i18n)
#:use-module ((webid-oidc stubs) #:prefix stubs:)
#:use-module (web uri)
#:use-module (web client)
#:use-module (web response)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (ice-9 receive)
#:use-module (ice-9 optargs)
#:use-module (rdf rdf)
#:use-module (turtle tordf)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 match)
#:use-module (sxml match)
#:use-module (sxml simple)
#:declarative? #t
#:export
(
public-oidc-client
&invalid-client-manifest
make-invalid-client-manifest
invalid-client-manifest?
&unauthorized-redirect-uri
make-unauthorized-redirect-uri
unauthorized-redirect-uri?
&inconsistent-client-manifest
make-inconsistent-client-manifest
inconsistent-client-manifest?
&cannot-serve-public-manifest
make-cannot-serve-public-manifest
cannot-serve-public-manifest?
&cannot-fetch-client-manifest
make-cannot-fetch-client-manifest
cannot-fetch-client-manifest?
the-client-manifest
client-manifest?
make-client-manifest
client-manifest-client-id
client-manifest-check-redirect-uri
serve-client-manifest
get-client-manifest
))
(define public-oidc-client
'public-oidc-client)
(define-exception-type
&invalid-client-manifest
&external-error
make-invalid-client-manifest
invalid-client-manifest?)
(define-exception-type
&unauthorized-redirect-uri
&external-error
make-unauthorized-redirect-uri
unauthorized-redirect-uri?)
(define-exception-type
&inconsistent-client-manifest
&external-error
make-inconsistent-client-manifest
inconsistent-client-manifest?)
(define-exception-type
&cannot-serve-public-manifest
&external-error
make-cannot-serve-public-manifest
cannot-serve-public-manifest?)
(define-exception-type
&cannot-fetch-client-manifest
&external-error
make-cannot-fetch-client-manifest
cannot-fetch-client-manifest?)
(define (the-client-manifest x)
(with-exception-handler
(lambda (error)
(let ((sysadmin-message
(if (exception-with-message? error)
(format #f (G_ "this is not a client manifest: ~a")
(exception-message error))
(format #f (G_ "this is not a client manifest"))))
(user-message
(let ((new-paragraph
(sxml-match
(xml->sxml (W_ "<p>The client manifest could
not be queried. It can be because the client application is down, or
it is incomplete, or unusable for other reasons.</p>"))
((*TOP* ,element)
element))))
(if (message-for-the-user? error)
(sxml-match
(user-message error)
((div ,element ...)
`(div ,new-paragraph ,element ...))
(,element
`(div ,new-paragraph ,element)))
new-paragraph))))
(raise-exception
(make-exception
(make-invalid-client-manifest)
(make-exception-with-message sysadmin-message)
(make-message-for-the-user user-message)
error))))
(lambda ()
(let examine-fields ((fields x)
(client-id #f)
(redirect-uris #f)
(other-fields '()))
(match fields
(()
(unless (and client-id redirect-uris)
(fail (format #f (G_ "the client manifest is missing ~s")
(apply append
`(,@(if client-id '() '("client_id"))
,@(if redirect-uris '() '("redirect_uris")))))))
`((client_id . ,(uri->string client-id))
(redirect_uris . ,(list->vector (map uri->string redirect-uris)))
,@(reverse other-fields)))
((('client_id . (? string? (= string->uri (? uri? client-id-given)))) fields ...)
(examine-fields fields (or client-id client-id-given)
redirect-uris other-fields))
((('client_id . invalid) _ ...)
(fail (format #f (G_ "~s is an invalid \"client_id\" value, because it is not an URI")
invalid)))
((('redirect_uris . #((? string? (= string->uri (? uri? uri))) ...)) fields ...)
(examine-fields fields client-id (or redirect-uris uri) other-fields))
((('redirect_uris . #(_ ...)) _ ...)
(fail (format #f (G_ "at least one of the redirect URIs is not a proper URI"))))
((('redirect_uris . _) _ ...)
(fail (format #f (G_ "the \"redirect_uris\" field should be a vector of URIs"))))
((other-field fields ...)
(examine-fields fields client-id redirect-uris
`(,other-field ,@other-fields)))
(else
(fail (format #f (G_ "the client manifest should be a JSON object")))))))))
(define (client-manifest? x)
(false-if-exception
(the-client-manifest x)))
(define (make-client-manifest client-id redirect-uris)
(the-client-manifest
`((client_id . ,(uri->string client-id))
(redirect_uris . ,(list->vector
(map uri->string
redirect-uris))))))
(define (client-manifest-client-id mf)
(if (eq? mf public-oidc-client)
(string->uri "http://www.w3.org/ns/solid/terms#PublicOidcClient")
(string->uri (assq-ref (the-client-manifest mf) 'client_id))))
(define (check-redirect mf uris redir)
(match uris
(()
(let ((final-message
(format #f (G_ "the client manifest does not allow ~s as a redirection uri")
(uri->string redir)))
(final-user-message
(sxml-match
(xml->sxml (W_ "<p>The application wants to get your
authorization through <strong>~s</strong>, which is not
approved.</p>"))
((*TOP* ,element) element))))
(raise-exception
(make-exception
(make-unauthorized-redirect-uri)
(make-exception-with-message final-message)
(make-message-for-the-user final-user-message)))))
(((? (cute equal? <> redir) redir) _ ...)
#t)
((_ uris ...)
(check-redirect mf uris redir))))
(define (client-manifest-check-redirect-uri mf redir)
(unless (uri? redir)
(set! redir (string->uri redir)))
(if (eq? mf public-oidc-client)
#t
(let ((redirect-uris
(assq-ref (the-client-manifest mf) 'redirect_uris)))
(check-redirect (the-client-manifest mf)
(map string->uri (vector->list redirect-uris))
redir))))
(define (serve-client-manifest expiration-date mf)
(when (eq? mf public-oidc-client)
(let ((final-message
(format #f (G_ "cannot serve the public manifest"))))
(raise-exception
(make-exception
(make-cannot-serve-public-manifest)
(make-exception-with-message final-message)))))
(let ((json-object (stubs:scm->json-string
`((@context . "https://www.w3.org/ns/solid/oidc-context.jsonld")
,@(the-client-manifest mf)))))
(values (build-response #:headers `((content-type application/ld+json)
(expires . ,expiration-date)))
json-object)))
(define* (get-client-manifest id
#:key
(http-get http-get))
(unless (uri? id)
(set! id (string->uri id)))
(with-exception-handler
(lambda (error)
(let ((final-message
(if (exception-with-message? error)
(format #f (G_ "cannot fetch the client manifest ~s: ~a")
(uri->string id)
(exception-message error))
(format #f (G_ "cannot fetch the client manifest ~s")
(uri->string id)))))
(raise-exception
(make-exception
(make-cannot-fetch-client-manifest)
(make-exception-with-message final-message)
error))))
(lambda ()
(if (equal? id
(string->uri
"http://www.w3.org/ns/solid/terms#PublicOidcClient"))
public-oidc-client
(receive (response response-body)
(http-get id)
(when (bytevector? response-body)
(set! response-body (utf8->string response-body)))
(let ((mf (the-client-manifest (stubs:json-string->scm response-body))))
(unless (equal? (client-manifest-client-id mf) id)
(let ((final-message
(format #f (G_ "the client manifest is dereferenced from ~s, but it pretends to be ~s")
(uri->string id)
(uri->string (client-manifest-client-id mf)))))
(raise-exception
(make-exception
(make-inconsistent-client-manifest)
(make-exception-with-message final-message)))))
mf))))))
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