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[emacs.git] / lisp / epg-config.el
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1 ;;; epg-config.el --- configuration of the EasyPG Library
3 ;; Copyright (C) 2006-2015 Free Software Foundation, Inc.
5 ;; Author: Daiki Ueno <ueno@unixuser.org>
6 ;; Keywords: PGP, GnuPG
7 ;; Package: epg
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software: you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation, either version 3 of the License, or
14 ;; (at your option) any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
24 ;;; Code:
26 (defconst epg-package-name "epg"
27 "Name of this package.")
29 (defconst epg-version-number "1.0.0"
30 "Version number of this package.")
32 (defconst epg-bug-report-address "ueno@unixuser.org"
33 "Report bugs to this address.")
35 (defgroup epg ()
36 "Interface to the GNU Privacy Guard (GnuPG)."
37 :tag "EasyPG"
38 :version "23.1"
39 :group 'data
40 :group 'external)
42 (defcustom epg-gpg-program (cond ((executable-find "gpg") "gpg")
43 ((executable-find "gpg2") "gpg2")
44 (t "gpg"))
45 "The `gpg' executable."
46 :group 'epg
47 :type 'string)
49 (defcustom epg-gpgsm-program "gpgsm"
50 "The `gpgsm' executable."
51 :group 'epg
52 :type 'string)
54 (defcustom epg-gpg-home-directory nil
55 "The directory which contains the configuration files of `epg-gpg-program'."
56 :group 'epg
57 :type '(choice (const :tag "Default" nil) directory))
59 (defcustom epg-passphrase-coding-system nil
60 "Coding system to use with messages from `epg-gpg-program'."
61 :group 'epg
62 :type 'symbol)
64 (defcustom epg-debug nil
65 "If non-nil, debug output goes to the \" *epg-debug*\" buffer.
66 Note that the buffer name starts with a space."
67 :group 'epg
68 :type 'boolean)
70 (defconst epg-gpg-minimum-version "1.4.3")
72 ;;;###autoload
73 (defun epg-configuration ()
74 "Return a list of internal configuration parameters of `epg-gpg-program'."
75 (let (config groups type args)
76 (with-temp-buffer
77 (apply #'call-process epg-gpg-program nil (list t nil) nil
78 (append (if epg-gpg-home-directory
79 (list "--homedir" epg-gpg-home-directory))
80 '("--with-colons" "--list-config")))
81 (goto-char (point-min))
82 (while (re-search-forward "^cfg:\\([^:]+\\):\\(.*\\)" nil t)
83 (setq type (intern (match-string 1))
84 args (match-string 2))
85 (cond
86 ((eq type 'group)
87 (if (string-match "\\`\\([^:]+\\):" args)
88 (setq groups
89 (cons (cons (downcase (match-string 1 args))
90 (delete "" (split-string
91 (substring args
92 (match-end 0))
93 ";")))
94 groups))
95 (if epg-debug
96 (message "Invalid group configuration: %S" args))))
97 ((memq type '(pubkey cipher digest compress))
98 (if (string-match "\\`\\([0-9]+\\)\\(;[0-9]+\\)*" args)
99 (setq config
100 (cons (cons type
101 (mapcar #'string-to-number
102 (delete "" (split-string args ";"))))
103 config))
104 (if epg-debug
105 (message "Invalid %S algorithm configuration: %S"
106 type args))))
108 (setq config (cons (cons type args) config))))))
109 (if groups
110 (cons (cons 'groups groups) config)
111 config)))
113 (defun epg-config--parse-version (string)
114 (let ((index 0)
115 version)
116 (while (eq index (string-match "\\([0-9]+\\)\\.?" string index))
117 (setq version (cons (string-to-number (match-string 1 string))
118 version)
119 index (match-end 0)))
120 (nreverse version)))
122 (defun epg-config--compare-version (v1 v2)
123 (while (and v1 v2 (= (car v1) (car v2)))
124 (setq v1 (cdr v1) v2 (cdr v2)))
125 (- (or (car v1) 0) (or (car v2) 0)))
127 ;;;###autoload
128 (defun epg-check-configuration (config &optional minimum-version)
129 "Verify that a sufficient version of GnuPG is installed."
130 (let ((entry (assq 'version config))
131 version)
132 (unless (and entry
133 (stringp (cdr entry)))
134 (error "Undetermined version: %S" entry))
135 (setq version (epg-config--parse-version (cdr entry))
136 minimum-version (epg-config--parse-version
137 (or minimum-version
138 epg-gpg-minimum-version)))
139 (unless (>= (epg-config--compare-version version minimum-version) 0)
140 (error "Unsupported version: %s" (cdr entry)))))
142 ;;;###autoload
143 (defun epg-expand-group (config group)
144 "Look at CONFIG and try to expand GROUP."
145 (let ((entry (assq 'groups config)))
146 (if (and entry
147 (setq entry (assoc (downcase group) (cdr entry))))
148 (cdr entry))))
150 (provide 'epg-config)
152 ;;; epg-config.el ends here