EasyPG: Initial check-in.

1 files changed, 140 insertions, 0 deletions

diff --git a/lisp/epg-config.el b/lisp/epg-config.el
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+;;; epg-config.el --- configuration of the EasyPG Library
+;; Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
+
+;; Author: Daiki Ueno <ueno@unixuser.org>
+;; Keywords: PGP, GnuPG
+
+;; 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, 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Code:
+
+(require 'epg-package-info)
+
+(defgroup epg ()
+  "The EasyPG Library"
+  :group 'emacs)
+
+(defcustom epg-gpg-program "gpg"
+  "The `gpg' executable."
+  :group 'epg
+  :type 'string)
+
+(defcustom epg-gpgsm-program "gpgsm"
+  "The `gpgsm' executable."
+  :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")
+
+;;;###autoload
+(defun epg-configuration ()
+  "Return a list of internal configuration parameters of `epg-gpg-program'."
+  (let (config groups type args)
+    (with-temp-buffer
+      (apply #'call-process epg-gpg-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))))))
+    (if groups
+	(cons (cons 'groups groups) config)
+      config)))
+
+(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