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;;; Shroud
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;;
;;; Shroud is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; Shroud 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
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Shroud. If not, see <http://www.gnu.org/licenses/>.
(define-module (shroud secret)
#:use-module (ice-9 match)
#:use-module (ice-9 vlist)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (shroud utils)
#:export (make-secret
secret?
secret-id
secret-contents
secret-ref
alist->secret
secret->alist
load-secrets
save-secrets
secrets-by-id))
(define-record-type <secret>
(make-secret id contents)
secret?
(id secret-id)
(contents secret-contents))
(define (secret-ref secret key)
"Return the secret data associated with KEY in SECRET."
(assoc-ref (secret-contents secret) key))
(define (alist->secret alist)
"Convert ALIST into a <secret> record."
(make-secret (assq-ref alist 'id)
(assq-ref alist 'contents)))
(define (secret->alist secret)
"Convert SECRET into an alist."
(match secret
(($ <secret> id contents)
`((id . ,id)
(contents . ,contents)))))
(define (load-secrets file)
"Load secrets from FILE, or return '() if FILE does not exist."
(if (file-exists? file)
(map alist->secret
;; Handle existing file that isn't PGP encrypted.
(let ((stored (call-with-decrypted-input-file file read)))
(if (eof-object? stored)
(throw 'decrypt-fail file)
stored)))
'()))
(define (save-secrets secrets file user-id)
"Write SECRETS to FILE, encrypted for USER-ID."
(call-with-encrypted-output-file file user-id
(lambda (port)
(write (map secret->alist secrets) port))))
(define (secrets-by-id secrets)
"Convert the list SECRETS into a vhash keyed off of the secret id."
(fold (lambda (secret result)
(vhash-cons (secret-id secret) secret result))
vlist-null secrets))
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