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153 lines
4.6 KiB
EmacsLisp
153 lines
4.6 KiB
EmacsLisp
;;; epg-config.el --- configuration of the EasyPG Library
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;; Copyright (C) 2006-2014 Free Software Foundation, Inc.
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;; Author: Daiki Ueno <ueno@unixuser.org>
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;; Keywords: PGP, GnuPG
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;; Package: epg
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Code:
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(defconst epg-package-name "epg"
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"Name of this package.")
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(defconst epg-version-number "1.0.0"
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"Version number of this package.")
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(defconst epg-bug-report-address "ueno@unixuser.org"
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"Report bugs to this address.")
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(defgroup epg ()
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"Interface to the GNU Privacy Guard (GnuPG)."
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:tag "EasyPG"
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:version "23.1"
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:group 'data
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:group 'external)
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(defcustom epg-gpg-program (cond ((executable-find "gpg") "gpg")
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((executable-find "gpg2") "gpg2")
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(t "gpg"))
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"The `gpg' executable."
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:group 'epg
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:type 'string)
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(defcustom epg-gpgsm-program "gpgsm"
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"The `gpgsm' executable."
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:group 'epg
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:type 'string)
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(defcustom epg-gpg-home-directory nil
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"The directory which contains the configuration files of `epg-gpg-program'."
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:group 'epg
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:type '(choice (const :tag "Default" nil) directory))
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(defcustom epg-passphrase-coding-system nil
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"Coding system to use with messages from `epg-gpg-program'."
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:group 'epg
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:type 'symbol)
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(defcustom epg-debug nil
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"If non-nil, debug output goes to the \" *epg-debug*\" buffer.
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Note that the buffer name starts with a space."
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:group 'epg
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:type 'boolean)
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(defconst epg-gpg-minimum-version "1.4.3")
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;;;###autoload
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(defun epg-configuration ()
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"Return a list of internal configuration parameters of `epg-gpg-program'."
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(let (config groups type args)
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(with-temp-buffer
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(apply #'call-process epg-gpg-program nil (list t nil) nil
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(append (if epg-gpg-home-directory
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(list "--homedir" epg-gpg-home-directory))
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'("--with-colons" "--list-config")))
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(goto-char (point-min))
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(while (re-search-forward "^cfg:\\([^:]+\\):\\(.*\\)" nil t)
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(setq type (intern (match-string 1))
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args (match-string 2))
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(cond
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((eq type 'group)
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(if (string-match "\\`\\([^:]+\\):" args)
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(setq groups
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(cons (cons (downcase (match-string 1 args))
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(delete "" (split-string
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(substring args
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(match-end 0))
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";")))
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groups))
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(if epg-debug
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(message "Invalid group configuration: %S" args))))
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((memq type '(pubkey cipher digest compress))
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(if (string-match "\\`\\([0-9]+\\)\\(;[0-9]+\\)*" args)
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(setq config
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(cons (cons type
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(mapcar #'string-to-number
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(delete "" (split-string args ";"))))
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config))
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(if epg-debug
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(message "Invalid %S algorithm configuration: %S"
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type args))))
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(t
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(setq config (cons (cons type args) config))))))
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(if groups
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(cons (cons 'groups groups) config)
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config)))
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(defun epg-config--parse-version (string)
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(let ((index 0)
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version)
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(while (eq index (string-match "\\([0-9]+\\)\\.?" string index))
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(setq version (cons (string-to-number (match-string 1 string))
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version)
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index (match-end 0)))
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(nreverse version)))
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(defun epg-config--compare-version (v1 v2)
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(while (and v1 v2 (= (car v1) (car v2)))
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(setq v1 (cdr v1) v2 (cdr v2)))
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(- (or (car v1) 0) (or (car v2) 0)))
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;;;###autoload
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(defun epg-check-configuration (config &optional minimum-version)
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"Verify that a sufficient version of GnuPG is installed."
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(let ((entry (assq 'version config))
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version)
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(unless (and entry
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(stringp (cdr entry)))
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(error "Undetermined version: %S" entry))
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(setq version (epg-config--parse-version (cdr entry))
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minimum-version (epg-config--parse-version
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(or minimum-version
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epg-gpg-minimum-version)))
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(unless (>= (epg-config--compare-version version minimum-version) 0)
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(error "Unsupported version: %s" (cdr entry)))))
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;;;###autoload
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(defun epg-expand-group (config group)
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"Look at CONFIG and try to expand GROUP."
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(let ((entry (assq 'groups config)))
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(if (and entry
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(setq entry (assoc (downcase group) (cdr entry))))
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(cdr entry))))
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(provide 'epg-config)
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;;; epg-config.el ends here
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