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;;; epg-config.el --- configuration of the EasyPG Library
;; Copyright (C) 2006-2016 Free Software Foundation, Inc.
;; Author: Daiki Ueno <ueno@unixuser.org>
;; Keywords: PGP, GnuPG
;; Package: epg
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(eval-when-compile (require 'cl-lib))
(defconst epg-package-name "epg"
"Name of this package.")
(defconst epg-version-number "1.0.0"
"Version number of this package.")
(defconst epg-bug-report-address "ueno@unixuser.org"
"Report bugs to this address.")
(defgroup epg ()
"Interface to the GNU Privacy Guard (GnuPG)."
:tag "EasyPG"
:version "23.1"
:group 'data
:group 'external)
(defcustom epg-gpg-program (if (executable-find "gpg2")
"gpg2"
"gpg")
"The `gpg' executable."
:version "25.1"
:group 'epg
:type 'string)
(defcustom epg-gpgsm-program "gpgsm"
"The `gpgsm' executable."
:group 'epg
:type 'string)
(defcustom epg-gpgconf-program "gpgconf"
"The `gpgconf' executable."
:version "25.1"
:group 'epg
:type 'string)
(defcustom epg-gpg-home-directory nil
"The directory which contains the configuration files of `epg-gpg-program'."
:group 'epg
:type '(choice (const :tag "Default" nil) directory))
(defcustom epg-passphrase-coding-system nil
"Coding system to use with messages from `epg-gpg-program'."
:group 'epg
:type 'symbol)
(defcustom epg-debug nil
"If non-nil, debug output goes to the \" *epg-debug*\" buffer.
Note that the buffer name starts with a space."
:group 'epg
:type 'boolean)
(defconst epg-gpg-minimum-version "1.4.3")
(defconst epg-config--program-alist
'((OpenPGP
epg-gpg-program
epg-config--make-gpg-configuration
("gpg2" . "2.1.6") ("gpg" . "1.4.3"))
(CMS
epg-gpgsm-program
epg-config--make-gpgsm-configuration
("gpgsm" . "2.0.4")))
"Alist used to obtain the usable configuration of executables.
The first element of each entry is protocol symbol, which is
either `OpenPGP' or `CMS'. The second element is a symbol where
the executable name is remembered. The third element is a
function which constructs a configuration object (actually a
plist). The rest of the entry is an alist mapping executable
names to the minimum required version suitable for the use with
Emacs.")
(defvar epg--configurations nil)
;;;###autoload
(defun epg-find-configuration (protocol &optional force)
"Find or create a usable configuration to handle PROTOCOL.
This function first looks at the existing configuration found by
the previous invocation of this function, unless FORCE is non-nil.
Then it walks through `epg-config--program-alist'. If
`epg-gpg-program' or `epg-gpgsm-program' is already set with
custom, use it. Otherwise, it tries the programs listed in the
entry until the version requirement is met."
(let ((entry (assq protocol epg-config--program-alist)))
(unless entry
(error "Unknown protocol %S" protocol))
(cl-destructuring-bind (symbol constructor . alist)
(cdr entry)
(or (and (not force) (alist-get protocol epg--configurations))
;; If the executable value is already set with M-x
;; customize, use it without checking.
(if (get symbol 'saved-value)
(let ((configuration (funcall constructor (symbol-value symbol))))
(push (cons protocol configuration) epg--configurations)
configuration)
(catch 'found
(dolist (program-version alist)
(let ((executable (executable-find (car program-version))))
(when executable
(let ((configuration
(funcall constructor executable)))
(when (ignore-errors
(epg-check-configuration configuration
(cdr program-version))
t)
(push (cons protocol configuration) epg--configurations)
(throw 'found configuration))))))))))))
;; Create an `epg-configuration' object for `gpg', using PROGRAM.
(defun epg-config--make-gpg-configuration (program)
(let (config groups type args)
(with-temp-buffer
(apply #'call-process program nil (list t nil) nil
(append (if epg-gpg-home-directory
(list "--homedir" epg-gpg-home-directory))
'("--with-colons" "--list-config")))
(goto-char (point-min))
(while (re-search-forward "^cfg:\\([^:]+\\):\\(.*\\)" nil t)
(setq type (intern (match-string 1))
args (match-string 2))
(cond
((eq type 'group)
(if (string-match "\\`\\([^:]+\\):" args)
(setq groups
(cons (cons (downcase (match-string 1 args))
(delete "" (split-string
(substring args
(match-end 0))
";")))
groups))
(if epg-debug
(message "Invalid group configuration: %S" args))))
((memq type '(pubkey cipher digest compress))
(if (string-match "\\`\\([0-9]+\\)\\(;[0-9]+\\)*" args)
(setq config
(cons (cons type
(mapcar #'string-to-number
(delete "" (split-string args ";"))))
config))
(if epg-debug
(message "Invalid %S algorithm configuration: %S"
type args))))
(t
(setq config (cons (cons type args) config))))))
(push (cons 'program program) config)
(if groups
(cons (cons 'groups groups) config)
config)))
;; Create an `epg-configuration' object for `gpgsm', using PROGRAM.
(defun epg-config--make-gpgsm-configuration (program)
(with-temp-buffer
(call-process program nil (list t nil) nil "--version")
(goto-char (point-min))
(when (looking-at "\\S-+ (")
(goto-char (match-end 0))
(backward-char)
(forward-sexp)
(skip-syntax-forward "-" (point-at-eol))
(list (cons 'program program)
(cons 'version (buffer-substring (point) (point-at-eol)))))))
;;;###autoload
(defun epg-configuration ()
"Return a list of internal configuration parameters of `epg-gpg-program'."
(declare (obsolete epg-find-configuration "25.1"))
(epg-config--make-gpg-configuration epg-gpg-program))
(defun epg-config--parse-version (string)
(let ((index 0)
version)
(while (eq index (string-match "\\([0-9]+\\)\\.?" string index))
(setq version (cons (string-to-number (match-string 1 string))
version)
index (match-end 0)))
(nreverse version)))
(defun epg-config--compare-version (v1 v2)
(while (and v1 v2 (= (car v1) (car v2)))
(setq v1 (cdr v1) v2 (cdr v2)))
(- (or (car v1) 0) (or (car v2) 0)))
;;;###autoload
(defun epg-check-configuration (config &optional minimum-version)
"Verify that a sufficient version of GnuPG is installed."
(let ((entry (assq 'version config))
version)
(unless (and entry
(stringp (cdr entry)))
(error "Undetermined version: %S" entry))
(setq version (epg-config--parse-version (cdr entry))
minimum-version (epg-config--parse-version
(or minimum-version
epg-gpg-minimum-version)))
(unless (>= (epg-config--compare-version version minimum-version) 0)
(error "Unsupported version: %s" (cdr entry)))))
;;;###autoload
(defun epg-expand-group (config group)
"Look at CONFIG and try to expand GROUP."
(let ((entry (assq 'groups config)))
(if (and entry
(setq entry (assoc (downcase group) (cdr entry))))
(cdr entry))))
(provide 'epg-config)
;;; epg-config.el ends here
|
