File name fix, for AUTHORS.
[emacs.git] / lisp / epg-config.el
blob29ac8b09c3a4aca7993d89b77955ab33e5ea962a
1 ;;; epg-config.el --- configuration of the EasyPG Library
2 ;; Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
4 ;; Author: Daiki Ueno <ueno@unixuser.org>
5 ;; Keywords: PGP, GnuPG
7 ;; This file is part of GNU Emacs.
9 ;; GNU Emacs is free software: you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation, either version 3 of the License, or
12 ;; (at your option) any later version.
14 ;; GNU Emacs is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
22 ;;; Code:
24 (defconst epg-package-name "epg"
25 "Name of this package.")
27 (defconst epg-version-number "1.0.0"
28 "Version number of this package.")
30 (defconst epg-bug-report-address "ueno@unixuser.org"
31 "Report bugs to this address.")
33 (defgroup epg ()
34 "The EasyPG Library"
35 :version "23.1"
36 :group 'emacs)
38 (defcustom epg-gpg-program "gpg"
39 "The `gpg' executable."
40 :group 'epg
41 :type 'string)
43 (defcustom epg-gpgsm-program "gpgsm"
44 "The `gpgsm' executable."
45 :group 'epg
46 :type 'string)
48 (defcustom epg-gpg-home-directory nil
49 "The directory which contains the configuration files of `epg-gpg-program'."
50 :group 'epg
51 :type '(choice (const :tag "Default" nil) directory))
53 (defcustom epg-passphrase-coding-system nil
54 "Coding system to use with messages from `epg-gpg-program'."
55 :group 'epg
56 :type 'symbol)
58 (defcustom epg-debug nil
59 "If non-nil, debug output goes to the \" *epg-debug*\" buffer.
60 Note that the buffer name starts with a space."
61 :group 'epg
62 :type 'boolean)
64 (defconst epg-gpg-minimum-version "1.4.3")
66 ;;;###autoload
67 (defun epg-configuration ()
68 "Return a list of internal configuration parameters of `epg-gpg-program'."
69 (let (config groups type args)
70 (with-temp-buffer
71 (apply #'call-process epg-gpg-program nil (list t nil) nil
72 (append (if epg-gpg-home-directory
73 (list "--homedir" epg-gpg-home-directory))
74 '("--with-colons" "--list-config")))
75 (goto-char (point-min))
76 (while (re-search-forward "^cfg:\\([^:]+\\):\\(.*\\)" nil t)
77 (setq type (intern (match-string 1))
78 args (match-string 2))
79 (cond
80 ((eq type 'group)
81 (if (string-match "\\`\\([^:]+\\):" args)
82 (setq groups
83 (cons (cons (downcase (match-string 1 args))
84 (delete "" (split-string
85 (substring args
86 (match-end 0))
87 ";")))
88 groups))
89 (if epg-debug
90 (message "Invalid group configuration: %S" args))))
91 ((memq type '(pubkey cipher digest compress))
92 (if (string-match "\\`\\([0-9]+\\)\\(;[0-9]+\\)*" args)
93 (setq config
94 (cons (cons type
95 (mapcar #'string-to-number
96 (delete "" (split-string args ";"))))
97 config))
98 (if epg-debug
99 (message "Invalid %S algorithm configuration: %S"
100 type args))))
102 (setq config (cons (cons type args) config))))))
103 (if groups
104 (cons (cons 'groups groups) config)
105 config)))
107 (defun epg-config--parse-version (string)
108 (let ((index 0)
109 version)
110 (while (eq index (string-match "\\([0-9]+\\)\\.?" string index))
111 (setq version (cons (string-to-number (match-string 1 string))
112 version)
113 index (match-end 0)))
114 (nreverse version)))
116 (defun epg-config--compare-version (v1 v2)
117 (while (and v1 v2 (= (car v1) (car v2)))
118 (setq v1 (cdr v1) v2 (cdr v2)))
119 (- (or (car v1) 0) (or (car v2) 0)))
121 ;;;###autoload
122 (defun epg-check-configuration (config &optional minimum-version)
123 "Verify that a sufficient version of GnuPG is installed."
124 (let ((entry (assq 'version config))
125 version)
126 (unless (and entry
127 (stringp (cdr entry)))
128 (error "Undetermined version: %S" entry))
129 (setq version (epg-config--parse-version (cdr entry))
130 minimum-version (epg-config--parse-version
131 (or minimum-version
132 epg-gpg-minimum-version)))
133 (unless (>= (epg-config--compare-version version minimum-version) 0)
134 (error "Unsupported version: %s" (cdr entry)))))
136 ;;;###autoload
137 (defun epg-expand-group (config group)
138 "Look at CONFIG and try to expand GROUP."
139 (let ((entry (assq 'groups config)))
140 (if (and entry
141 (setq entry (assoc (downcase group) (cdr entry))))
142 (cdr entry))))
144 (provide 'epg-config)
146 ;; arch-tag: 9aca7cb8-5f63-4bcb-84ee-46fd2db0763f
147 ;;; epg-config.el ends here