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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 jwk)
#:use-module ((webid-oidc stubs) #:prefix stubs:)
#:use-module (webid-oidc errors)
#:use-module (webid-oidc web-i18n)
#:use-module (ice-9 receive)
#:use-module (ice-9 optargs)
#:use-module (ice-9 exceptions)
#:use-module (srfi srfi-19)
#:use-module (web response)
#:use-module (web client)
#:use-module (rnrs bytevectors)
#:declarative? #t
#:export
(
the-jwk
jwk?
kty
the-public-jwk
jwk-public?
strip
jkt
make-rsa-public-key
make-rsa-private-key
make-ec-point
make-ec-scalar
generate-key
the-jwks
jwks?
make-jwks
jwks-keys
serve-jwks
get-jwks
¬-a-jwk
make-not-a-jwk
not-a-jwk?
¬-a-jwks
make-not-a-jwks
not-a-jwks?
))
(define-exception-type
¬-a-jwk
&external-error
make-not-a-jwk
not-a-jwk?)
(define-exception-type
¬-a-jwks
&external-error
make-not-a-jwks
not-a-jwks?)
(define (the-jwk x)
(with-exception-handler
(lambda (error)
(let ((final-message
(if (exception-with-message? error)
(format #f (G_ "the JWK is invalid: ~a")
(exception-message error))
(format #f (G_ "the JWK is invalid")))))
(raise-exception
(make-exception
(make-not-a-jwk)
(make-exception-with-message final-message)
error))))
(lambda ()
(let ((kty (stubs:kty x)))
(unless (or (eq? kty 'EC) (eq? kty 'RSA))
(fail (format #f (G_ "unknown key type ~s")
kty)))
x))))
(define (jwk? x)
(false-if-exception
(and (the-jwk x) #t)))
(define (kty x)
(stubs:kty (the-jwk x)))
(define (the-public-jwk x)
(with-exception-handler
(lambda (error)
(let ((final-message
(if (exception-with-message? error)
(format #f (G_ "the public JWK is invalid: ~a")
(exception-message error))
(format #f (G_ "the public JWK is invalid")))))
(raise-exception
(make-exception
(make-not-a-jwk)
(make-exception-with-message final-message)
error))))
(lambda ()
(let ((key (the-jwk x)))
(let ((crv (assq-ref key 'crv))
(x (assq-ref key 'x))
(y (assq-ref key 'y))
(n (assq-ref key 'n))
(e (assq-ref key 'e)))
(let ((ec-part `((crv . ,crv)
(x . ,x)
(y . ,y)))
(rsa-part `((n . ,n)
(e . ,e))))
(case (stubs:kty key)
((EC) ec-part)
((RSA) rsa-part))))))))
(define (jwk-public? key)
(false-if-exception
(and (the-public-jwk key) #t)))
(define (strip key)
(with-exception-handler
(lambda (error)
(let ((final-message
(if (exception-with-message? error)
(format #f (G_ "cannot extract the public part of the key: ~a")
(exception-message error))
(format #f (G_ "cannot extract the public part of the key")))))
(raise-exception
(make-exception
(make-not-a-jwk)
(make-exception-with-message final-message)
error))))
(lambda ()
(stubs:strip-key key))))
(define (jkt x)
(stubs:jkt (the-public-jwk x)))
(define (make-rsa-public-key n e)
(the-public-jwk
`((n . ,n)
(e . ,e))))
(define (make-rsa-private-key d p q dp dq qi)
(the-jwk
`((d . ,d)
(p . ,p)
(q . ,q)
(dp . ,dp)
(dq . ,dq)
(qi . ,qi))))
(define (make-ec-point crv x y)
(if (symbol? crv)
(make-ec-point (symbol->string crv) x y)
(the-public-jwk
`((crv . ,crv)
(x . ,x)
(y . ,y)))))
(define (make-ec-scalar crv d)
(if (symbol? crv)
(make-ec-scalar (symbol->string crv) d)
(the-jwk
`((crv . ,crv)
(d . ,d)))))
(define generate-key stubs:generate-key)
(define (the-public-keys keys)
(map the-public-jwk keys))
(define (the-jwks jwks)
(let ((keys (vector->list (assoc-ref jwks 'keys))))
(unless keys
(let ((final-message
(format #f (G_ "the JWKS is invalid, because it does not have keys"))))
(raise-exception
(make-exception
(make-not-a-jwks)
(make-exception-with-message final-message)))))
(with-exception-handler
(lambda (error)
(let ((final-message
(if (exception-with-message? error)
(format #f (G_ "the JWKS is invalid: ~a")
(exception-message error))
(format #f (G_ "the JWKS is invalid")))))
(raise-exception
(make-exception
(make-not-a-jwks)
(make-exception-with-message final-message)
error))))
(lambda ()
`((keys . ,(list->vector (the-public-keys keys))))))))
(define (jwks? jwks)
(false-if-exception
(and (the-jwks jwks) #t)))
(define (make-jwks keys)
(if (vector? keys)
(make-jwks (vector->list keys))
(let ((pubs (list->vector (map strip keys))))
(the-jwks `((keys . ,pubs))))))
(define (jwks-keys jwks)
(vector->list (assq-ref (the-jwks jwks) 'keys)))
(define (serve-jwks expiration-date jwks)
(values (build-response
#:headers `((content-type . (application/json))
(expires . ,expiration-date)))
(stubs:scm->json-string (the-jwks jwks))))
(define* (get-jwks uri #:key (http-get http-get))
(receive (response response-body) (http-get uri)
(with-exception-handler
(lambda (cause)
(raise-unexpected-response response cause))
(lambda ()
(unless (eqv? (response-code response) 200)
(raise-request-failed-unexpectedly
(response-code response)
(response-reason-phrase response)))
(let ((content-type (response-content-type response)))
(unless content-type
(raise-unexpected-header-value 'content-type content-type))
(unless (and (eq? (car content-type) 'application/json)
(or (equal? (assoc-ref (cdr content-type) 'charset)
"utf-8")
(not (assoc-ref (cdr content-type) 'charset))))
(raise-unexpected-header-value 'content-type content-type))
(unless (string? response-body)
(set! response-body (utf8->string response-body)))
(the-jwks (stubs:json-string->scm response-body)))))))
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