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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 authorization-code)
#:use-module (webid-oidc errors)
#:use-module ((webid-oidc stubs) #:prefix stubs:)
#:use-module (webid-oidc jws)
#:use-module (webid-oidc jti)
#:use-module ((webid-oidc parameters) #:prefix p:)
#:use-module (web uri)
#:use-module (srfi srfi-19))
(define-public (the-authorization-code-header x)
(with-exception-handler
(lambda (error)
(raise-not-an-authorization-code-header x error))
(lambda ()
(the-jws-header x))))
(define-public (authorization-code-header? x)
(false-if-exception
(and (the-authorization-code-header x) #t)))
(define-public (the-authorization-code-payload x)
(with-exception-handler
(lambda (error)
(raise-not-an-authorization-code-payload x error))
(lambda ()
(let ((x (the-jws-payload x)))
(let ((exp (assq-ref x 'exp))
(jti (assq-ref x 'jti))
(webid (assq-ref x 'webid))
(client-id (assq-ref x 'client_id)))
(unless (integer? exp)
(raise-incorrect-exp-field exp))
(unless (string? jti)
(raise-incorrect-jti-field jti))
(unless (and (string? webid) (string->uri webid))
(raise-incorrect-webid-field webid))
(unless (and (string? client-id) (string->uri client-id))
(raise-incorrect-client-id-field client-id))
x)))))
(define-public (authorization-code-payload? x)
(false-if-exception
(and (the-authorization-code-payload x) #t)))
(define-public (the-authorization-code x)
(with-exception-handler
(lambda (error)
(raise-not-an-authorization-code x error))
(lambda ()
(cons (the-authorization-code-header (car x))
(the-authorization-code-payload (cdr x))))))
(define-public (authorization-code? x)
(false-if-exception
(and (the-authorization-code x) #t)))
(define-public (make-authorization-code header payload)
(the-authorization-code (cons header payload)))
(define-public (make-authorization-code-header alg)
(when (symbol? alg)
(set! alg (symbol->string alg)))
(the-authorization-code-header
`((alg . ,alg))))
(define-public (make-authorization-code-payload exp jti sub aud)
(when (date? exp)
(set! exp (date->time-utc exp)))
(when (time? exp)
(set! exp (time-second exp)))
(when (uri? sub)
(set! sub (uri->string sub)))
(when (uri? aud)
(set! aud (uri->string aud)))
(the-authorization-code-payload
`((exp . ,exp)
(jti . ,jti)
(webid . ,sub)
(client_id . ,aud))))
(define-public (authorization-code-header code)
(car (the-authorization-code code)))
(define-public (authorization-code-payload code)
(cdr (the-authorization-code code)))
(define-public (authorization-code-alg code)
(when (authorization-code? code)
(set! code (authorization-code-header code)))
(jws-alg (the-authorization-code-header code)))
(define-public (authorization-code-exp code)
(when (authorization-code? code)
(set! code (authorization-code-payload code)))
(time-utc->date
(make-time time-utc 0 (assq-ref
(the-authorization-code-payload code)
'exp))))
(define-public (authorization-code-jti code)
(when (authorization-code? code)
(set! code (authorization-code-payload code)))
(assq-ref (the-authorization-code-payload code) 'jti))
(define-public (authorization-code-webid code)
(when (authorization-code? code)
(set! code (authorization-code-payload code)))
(string->uri
(assq-ref (the-authorization-code-payload code) 'webid)))
(define-public (authorization-code-client-id code)
(when (authorization-code? code)
(set! code (authorization-code-payload code)))
(string->uri
(assq-ref (the-authorization-code-payload code) 'client_id)))
(define-public (authorization-code-decode str jwk)
(parameterize ((p:current-date
(time-second (date->time-utc ((p:current-date))))))
(with-exception-handler
(lambda (error)
(raise-cannot-decode-authorization-code str error))
(lambda ()
(let ((code (the-authorization-code (jws-decode str (lambda (x) jwk)))))
(let ((exp (time-second (date->time-utc (authorization-code-exp code))))
(current-time (time-second (date->time-utc ((p:current-date))))))
(unless (<= current-time exp)
(raise-authorization-code-expired exp current-time))
(unless (jti-check (authorization-code-jti code)
(- exp current-time))
(with-exception-handler
(lambda (error)
(raise-jti-found (authorization-code-jti code) error))
(lambda ()
(error "the jti-check function returned #f"))))
code))))))
(define-public (authorization-code-encode authorization-code key)
(with-exception-handler
(lambda (error)
(raise-cannot-encode-authorization-code authorization-code key error))
(lambda ()
(jws-encode authorization-code key))))
(define-public (issue-authorization-code alg jwk exp sub aud)
(authorization-code-encode
(make-authorization-code
(make-authorization-code-header alg)
(make-authorization-code-payload exp (stubs:random 12) sub aud))
jwk))
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