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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 oidc-id-token)
#:use-module (webid-oidc oidc-configuration)
#:use-module (webid-oidc errors)
#:use-module (webid-oidc jws)
#:use-module (webid-oidc jti)
#:use-module ((webid-oidc stubs) #:prefix stubs:)
#:use-module (web uri)
#:use-module (web client)
#:use-module (ice-9 optargs)
#:use-module (srfi srfi-19))
(define-public (the-id-token-header x)
(with-exception-handler
(lambda (error)
(raise-not-an-id-token-header x error))
(lambda ()
(the-jws-header x))))
(define-public (id-token-header? x)
(false-if-exception
(and (the-id-token-header x) #t)))
(define-public (the-id-token-payload x)
(with-exception-handler
(lambda (error)
(raise-not-an-id-token-payload x error))
(lambda ()
(let ((x (the-jws-payload x)))
(let ((webid (assq-ref x 'webid))
(iss (assq-ref x 'iss))
(sub (assq-ref x 'sub))
(aud (assq-ref x 'aud))
(nonce (assq-ref x 'nonce))
(iat (assq-ref x 'iat))
(exp (assq-ref x 'exp)))
(unless (and webid (string? webid) (string->uri webid))
(raise-incorrect-webid-field webid))
(unless (and iss (string? iss) (string->uri iss))
(raise-incorrect-iss-field iss))
(unless (string? sub)
(raise-incorrect-sub-field sub))
(unless (and aud (string? aud) (string->uri aud))
(raise-incorrect-aud-field aud))
(unless (string? nonce)
(raise-incorrect-nonce-field nonce))
(unless (integer? iat)
(raise-incorrect-iat-field iat))
(unless (and (integer? exp) (>= exp iat))
(raise-incorrect-exp-field exp))
x)))))
(define-public (id-token-payload? x)
(false-if-exception
(and (the-id-token-header x) #t)))
(define-public (the-id-token x)
(with-exception-handler
(lambda (cause)
(raise-not-an-id-token x cause))
(lambda ()
(cons (the-id-token-header (car x))
(the-id-token-payload (cdr x))))))
(define-public (id-token? x)
(false-if-exception
(and (the-id-token x) #t)))
(define-public (make-id-token header payload)
(the-id-token
(cons header payload)))
(define-public (make-id-token-payload webid iss sub aud nonce exp iat)
(when (date? exp)
(set! exp (date->time-utc exp)))
(when (time? exp)
(set! exp (time-second exp)))
(when (date? iat)
(set! iat (date->time-utc iat)))
(when (time? iat)
(set! iat (time-second iat)))
(when (uri? webid)
(set! webid (uri->string webid)))
(when (uri? iss)
(set! iss (uri->string iss)))
(when (uri? aud)
(set! aud (uri->string aud)))
(the-id-token-payload
`((webid . ,webid)
(iss . ,iss)
(sub . ,sub)
(aud . ,aud)
(nonce . ,nonce)
(exp . ,exp)
(iat . ,iat))))
(define-public (id-token-header code)
(car (the-id-token code)))
(define-public (id-token-payload code)
(cdr (the-id-token code)))
(define-public (id-token-alg code)
(when (id-token? code)
(set! code (id-token-header code)))
(jws-alg (the-id-token-header code)))
(define-public (id-token-webid code)
(when (id-token? code)
(set! code (id-token-payload code)))
(string->uri
(assq-ref (the-id-token-payload code) 'webid)))
(define-public (id-token-iss code)
(when (id-token? code)
(set! code (id-token-payload code)))
(string->uri
(assq-ref (the-id-token-payload code) 'iss)))
(define-public (id-token-sub code)
(when (id-token? code)
(set! code (id-token-payload code)))
(assq-ref (the-id-token-payload code) 'sub))
(define-public (id-token-aud code)
(when (id-token? code)
(set! code (id-token-payload code)))
(string->uri
(assq-ref (the-id-token-payload code) 'aud)))
(define-public (id-token-nonce code)
(when (id-token? code)
(set! code (id-token-payload code)))
(assq-ref (the-id-token-payload code) 'nonce))
(define-public (id-token-exp code)
(when (id-token? code)
(set! code (id-token-payload code)))
(time-utc->date
(make-time time-utc 0 (assq-ref
(the-id-token-payload code)
'exp))))
(define-public (id-token-iat code)
(when (id-token? code)
(set! code (id-token-payload code)))
(time-utc->date
(make-time time-utc 0 (assq-ref
(the-id-token-payload code)
'iat))))
(define*-public (id-token-decode str #:key (http-get http-get))
(with-exception-handler
(lambda (error)
(raise-cannot-decode-id-token str error))
(lambda ()
(jws-decode
str
(lambda (token)
(let ((iss (id-token-iss token)))
(let ((cfg
(with-exception-handler
(lambda (error)
(raise-cannot-fetch-issuer-configuration iss error))
(lambda ()
(get-oidc-configuration
(uri-host iss)
#:userinfo (uri-userinfo iss)
#:port (uri-port iss)
#:http-get http-get)))))
(with-exception-handler
(lambda (error)
(raise-cannot-fetch-jwks iss
(oidc-configuration-jwks-uri cfg)
error))
(lambda ()
(oidc-configuration-jwks cfg #:http-get http-get))))))))))
(define-public (id-token-encode id-token key)
(with-exception-handler
(lambda (error)
(raise-cannot-encode-id-token id-token key error))
(lambda ()
(jws-encode id-token key))))
(define*-public (issue-id-token
issuer-key
#:key
(alg #f)
(webid #f)
(iss #f)
(sub #f)
(aud #f)
(exp #f)
(iat #f))
(unless sub
(set! sub webid))
(id-token-encode
(make-id-token
`((alg . ,(symbol->string alg)))
(make-id-token-payload webid iss sub aud (stubs:random 12) exp iat))
issuer-key))
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