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1 | ;;; epg-config.el --- configuration of the EasyPG Library |
2 | ;; Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc. | |
3 | ||
4 | ;; Author: Daiki Ueno <ueno@unixuser.org> | |
5 | ;; Keywords: PGP, GnuPG | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
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, or (at your option) | |
12 | ;; any later version. | |
13 | ||
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. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
21 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
22 | ;; Boston, MA 02110-1301, USA. | |
23 | ||
24 | ;;; Code: | |
25 | ||
26 | (require 'epg-package-info) | |
27 | ||
28 | (defgroup epg () | |
29 | "The EasyPG Library" | |
30 | :group 'emacs) | |
31 | ||
32 | (defcustom epg-gpg-program "gpg" | |
33 | "The `gpg' executable." | |
34 | :group 'epg | |
35 | :type 'string) | |
36 | ||
37 | (defcustom epg-gpgsm-program "gpgsm" | |
38 | "The `gpgsm' executable." | |
39 | :group 'epg | |
40 | :type 'string) | |
41 | ||
42 | (defcustom epg-gpg-home-directory nil | |
43 | "The directory which contains the configuration files of `epg-gpg-program'." | |
44 | :group 'epg | |
45 | :type '(choice (const :tag "Default" nil) directory)) | |
46 | ||
47 | (defcustom epg-passphrase-coding-system nil | |
48 | "Coding system to use with messages from `epg-gpg-program'." | |
49 | :group 'epg | |
50 | :type 'symbol) | |
51 | ||
52 | (defcustom epg-debug nil | |
53 | "If non-nil, debug output goes to the \" *epg-debug*\" buffer. | |
54 | Note that the buffer name starts with a space." | |
55 | :group 'epg | |
56 | :type 'boolean) | |
57 | ||
58 | (defconst epg-gpg-minimum-version "1.4.3") | |
59 | ||
60 | ;;;###autoload | |
61 | (defun epg-configuration () | |
62 | "Return a list of internal configuration parameters of `epg-gpg-program'." | |
63 | (let (config groups type args) | |
64 | (with-temp-buffer | |
65 | (apply #'call-process epg-gpg-program nil (list t nil) nil | |
66 | (append (if epg-gpg-home-directory | |
67 | (list "--homedir" epg-gpg-home-directory)) | |
68 | '("--with-colons" "--list-config"))) | |
69 | (goto-char (point-min)) | |
70 | (while (re-search-forward "^cfg:\\([^:]+\\):\\(.*\\)" nil t) | |
71 | (setq type (intern (match-string 1)) | |
72 | args (match-string 2)) | |
73 | (cond | |
74 | ((eq type 'group) | |
75 | (if (string-match "\\`\\([^:]+\\):" args) | |
76 | (setq groups | |
77 | (cons (cons (downcase (match-string 1 args)) | |
78 | (delete "" (split-string | |
79 | (substring args | |
80 | (match-end 0)) | |
81 | ";"))) | |
82 | groups)) | |
83 | (if epg-debug | |
84 | (message "Invalid group configuration: %S" args)))) | |
85 | ((memq type '(pubkey cipher digest compress)) | |
86 | (if (string-match "\\`\\([0-9]+\\)\\(;[0-9]+\\)*" args) | |
87 | (setq config | |
88 | (cons (cons type | |
89 | (mapcar #'string-to-number | |
90 | (delete "" (split-string args ";")))) | |
91 | config)) | |
92 | (if epg-debug | |
93 | (message "Invalid %S algorithm configuration: %S" | |
94 | type args)))) | |
95 | (t | |
96 | (setq config (cons (cons type args) config)))))) | |
97 | (if groups | |
98 | (cons (cons 'groups groups) config) | |
99 | config))) | |
100 | ||
101 | (defun epg-config--parse-version (string) | |
102 | (let ((index 0) | |
103 | version) | |
104 | (while (eq index (string-match "\\([0-9]+\\)\\.?" string index)) | |
105 | (setq version (cons (string-to-number (match-string 1 string)) | |
106 | version) | |
107 | index (match-end 0))) | |
108 | (nreverse version))) | |
109 | ||
110 | (defun epg-config--compare-version (v1 v2) | |
111 | (while (and v1 v2 (= (car v1) (car v2))) | |
112 | (setq v1 (cdr v1) v2 (cdr v2))) | |
113 | (- (or (car v1) 0) (or (car v2) 0))) | |
114 | ||
115 | ;;;###autoload | |
116 | (defun epg-check-configuration (config &optional minimum-version) | |
117 | "Verify that a sufficient version of GnuPG is installed." | |
118 | (let ((entry (assq 'version config)) | |
119 | version) | |
120 | (unless (and entry | |
121 | (stringp (cdr entry))) | |
122 | (error "Undetermined version: %S" entry)) | |
123 | (setq version (epg-config--parse-version (cdr entry)) | |
124 | minimum-version (epg-config--parse-version | |
125 | (or minimum-version | |
126 | epg-gpg-minimum-version))) | |
127 | (unless (>= (epg-config--compare-version version minimum-version) 0) | |
128 | (error "Unsupported version: %s" (cdr entry))))) | |
129 | ||
130 | ;;;###autoload | |
131 | (defun epg-expand-group (config group) | |
132 | "Look at CONFIG and try to expand GROUP." | |
133 | (let ((entry (assq 'groups config))) | |
134 | (if (and entry | |
135 | (setq entry (assoc (downcase group) (cdr entry)))) | |
136 | (cdr entry)))) | |
137 | ||
138 | (provide 'epg-config) | |
139 | ||
37b77401 | 140 | ;; arch-tag: 9aca7cb8-5f63-4bcb-84ee-46fd2db0763f |
c154c0be | 141 | ;;; epg-config.el ends here |