| 1 | ;;; epg-config.el --- configuration of the EasyPG Library |
| 2 | |
| 3 | ;; Copyright (C) 2006-2014 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Author: Daiki Ueno <ueno@unixuser.org> |
| 6 | ;; Keywords: PGP, GnuPG |
| 7 | ;; Package: epg |
| 8 | |
| 9 | ;; This file is part of GNU Emacs. |
| 10 | |
| 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. |
| 15 | |
| 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. |
| 20 | |
| 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/>. |
| 23 | |
| 24 | ;;; Code: |
| 25 | |
| 26 | (defconst epg-package-name "epg" |
| 27 | "Name of this package.") |
| 28 | |
| 29 | (defconst epg-version-number "1.0.0" |
| 30 | "Version number of this package.") |
| 31 | |
| 32 | (defconst epg-bug-report-address "ueno@unixuser.org" |
| 33 | "Report bugs to this address.") |
| 34 | |
| 35 | (defgroup epg () |
| 36 | "Interface to the GNU Privacy Guard (GnuPG)." |
| 37 | :tag "EasyPG" |
| 38 | :version "23.1" |
| 39 | :group 'data |
| 40 | :group 'external) |
| 41 | |
| 42 | (defcustom epg-gpg-program (or (executable-find "gpg") |
| 43 | (executable-find "gpg2") |
| 44 | "gpg") |
| 45 | "The `gpg' executable." |
| 46 | :group 'epg |
| 47 | :type 'string) |
| 48 | |
| 49 | (defcustom epg-gpgsm-program "gpgsm" |
| 50 | "The `gpgsm' executable." |
| 51 | :group 'epg |
| 52 | :type 'string) |
| 53 | |
| 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)) |
| 58 | |
| 59 | (defcustom epg-passphrase-coding-system nil |
| 60 | "Coding system to use with messages from `epg-gpg-program'." |
| 61 | :group 'epg |
| 62 | :type 'symbol) |
| 63 | |
| 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) |
| 69 | |
| 70 | (defconst epg-gpg-minimum-version "1.4.3") |
| 71 | |
| 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)))) |
| 107 | (t |
| 108 | (setq config (cons (cons type args) config)))))) |
| 109 | (if groups |
| 110 | (cons (cons 'groups groups) config) |
| 111 | config))) |
| 112 | |
| 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))) |
| 121 | |
| 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))) |
| 126 | |
| 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))))) |
| 141 | |
| 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)))) |
| 149 | |
| 150 | (provide 'epg-config) |
| 151 | |
| 152 | ;;; epg-config.el ends here |