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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 stubs)
#:use-module (webid-oidc config)
#:use-module (webid-oidc errors)
#:use-module (json))
(load-extension
(format #f "~a/libwebidoidc" libdir)
"init_webidoidc")
(define (fix-base64-decode data)
(catch 'base64-decoding-error
(lambda ()
(base64-decode data))
(lambda error
(raise-not-base64 data error))))
(define (fix-generate-key . args)
(catch 'unsupported-crv
(lambda ()
(apply generate-key args))
(lambda (error)
(raise-unsupported-crv (cadr error)))))
(define (fix-kty key)
(catch 'unsupported-crv
(lambda ()
(let ((ret (kty key)))
(unless ret
(raise-not-a-jwk key #f))
ret))
(lambda error
(raise-unsupported-crv (cadr error)))))
(define (fix-hash alg payload)
(catch 'unsupported-alg
(lambda ()
(hash alg payload))
(lambda error
(raise-unsupported-alg (cadr error)))))
(define (fix-sign alg key payload)
(catch 'unsupported-alg
(lambda ()
(sign alg key payload))
(lambda error
(raise-unsupported-alg (cadr error)))))
(define (fix-verify alg key payload signature)
(catch 'unsupported-alg
(lambda ()
(let ((ok
(verify alg key payload signature)))
(unless ok
(raise-invalid-signature key payload signature))))
(lambda error
(raise-unsupported-alg (cadr error)))))
(export
base64-encode
(fix-base64-decode . base64-decode)
random
random-init!
(fix-generate-key . generate-key)
(fix-kty . kty)
strip-key
(fix-hash . hash)
jkt
(fix-sign . sign)
(fix-verify . verify))
;; json reader from guile-json will not behave consistently with
;; SRFI-180 with objects: keys will be mapped to strings, not
;; symbols. So we fix alist keys to be symbols.
(define-public (fix-alists data)
(define (fix-an-alist rest alist)
(if (null? alist)
(reverse rest)
(let ((k/v (car alist))
(tail (cdr alist)))
(let ((key (car k/v))
(value (cdr k/v)))
(fix-an-alist
(acons (string->symbol key)
(fix-alists value)
rest)
tail)))))
(define (fix-a-vector vec)
(list->vector
(map fix-alists
(vector->list vec))))
(cond
((list? data)
(fix-an-alist '() data))
((vector? data)
(fix-a-vector data))
(else data)))
(define (fixed:json-string->scm str)
(with-exception-handler
(lambda (err)
(raise-not-json str err))
(lambda ()
(fix-alists (json-string->scm str)))))
(export (fixed:json-string->scm . json-string->scm))
(define (fixed:json->scm port)
(with-exception-handler
(lambda (err)
(raise-not-json "(input)" err))
(lambda ()
(fix-alists (json->scm port)))))
(export (fixed:json->scm . json->scm))
(define fixed:scm->json-string scm->json-string)
(export (fixed:scm->json-string . scm->json-string))
(define fixed:scm->json scm->json)
(export (fixed:scm->json . scm->json))
(define-public (mkdir-p name)
(catch 'system-error
(lambda ()
(mkdir name))
(lambda (key subr message args rest)
(case (car rest)
((17) ;; file exists
#t)
((2) ;; parent does not exist
(let ((parent (dirname name)))
(unless (equal? parent name)
(mkdir-p parent))
(mkdir name)))
(else
(throw key subr message args rest))))))
(define-public (open-output-file* filename . args)
(mkdir-p (dirname filename))
(apply open-output-file filename args))
(define-public (call-with-output-file* filename . args)
(mkdir-p (dirname filename))
(apply call-with-output-file filename args))
(define-public (atomically-update-file file lock-file-name f)
;; Call f with an output port. If f returns #f, delete the original
;; file. Otherwise, replace it.
(let ((updating-file-name (string-append file "~")))
(mkdir-p (dirname updating-file-name))
(call-with-output-file lock-file-name
(lambda (port)
(define (enter)
(flock port LOCK_EX))
(define (leave)
(flock port LOCK_UN))
(dynamic-wind
enter
(lambda ()
(call-with-output-file updating-file-name
(lambda (port)
(truncate-file port 0)
(with-exception-handler
(lambda (error)
(false-if-exception (delete-file updating-file-name))
(raise-exception error))
(lambda ()
(let ((ok (f port)))
(fsync port)
(close-port port)
(if ok
(rename-file updating-file-name file)
;; f asked us to delete the original file
(begin
(false-if-exception
(delete-file file))
(false-if-exception
(delete-file updating-file-name))))))))))
leave)))))
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