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;;; BBDB-PGP.EL --- use BBDB to store PGP preferences
;; Copyright (C) 1997,1999 Kevin Davidson
;; Author: Kevin Davidson tkld@quadstone.com
;; Maintainer: Kevin Davidson tkld@quadstone.com
;; Created: 10 Nov 1997
;; Version: $Revision$
;; Keywords: PGP BBDB message mailcrypt
;; This program 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 2, or (at your option)
;; any later version.
;; This program 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.
;; A copy of the GNU General Public License can be obtained from this
;; program's author (send electronic mail to tkld@quadstone.com) or
;; from the Free Software Foundation, Inc.,59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;; LCD Archive Entry:
;; bbdb-pgp|Kevin Davidson|tkld@quadstone.com
;; |Use BBDB to store PGP preferences
;; |$Date$|$Revision$|~/packages/bbdb-pgp.el
;;; Commentary:
;;
;; It is believed that encrypted mail works best if all mail between
;; individuals is encrypted - even concerning matters that are not
;; confidential. The reasoning is that confidential messages cannot
;; then be easily spotted and decryption efforts concentrated on them.
;; Some people therefore prefer to have all their email encrypted.
;; This package allows you to mark the BBDB entries for those
;; individuals so that messages will be encrypted when they are sent.
;;
;; These packages are required: BBDB, mailcrypt, message
;;
;; message.el is included with recent versions of Emacs.
;; You can use mail-mode as well as message-mode to send mail.
;;; Usage:
;; (require 'bbdb-pgp)
;;
;; Then for all users who you want to send encrypted mail to, add the field
;; pgp-mail with the value `encrypt'. Alternatively you can add the value
;; `sign' if you just want to send signed messages.
;;
;; and possibly (if you do not want the PGP field printed out)
;; (add-hook 'bbdb-print-elide bbdb-pgp-field)
;;
;; The variable bbdb/pgp-default-action defines what to do if the recipient
;; is not in the BBDB.
;;; TODO
;; Spot incoming PGP mail by hooking into mc-verify/decrypt and adding pgp-mail
;; field to BBDB entry (creating one if necessary); like bbdb-sc.el maintains
;; attribution prefs.
;;; PGP Public Key
;; The author's public key is available from any public PGP keyserver
;; eg http://www.pgp.net/pgpnet/
;; Fingerprint: 1F A9 3F 3E 90 F7 85 64 55 35 32 C8 75 91 3A E3
;;; Change log:
;; $Log$
;; Revision 1.1 2001/01/24 21:19:08 waider
;; Add-ons that didn't make it to the current release.
;;
;; Revision 1.4 1999/01/05 13:17:00 tkld
;; Update GPL version number and FSF snail mail address.
;;
;; Revision 1.3 1997/11/10 15:20:29 tkld
;; Expand commentary. Support encrypt/sign. Support mail-mode
;; (sendmail.el).
;;
;; Revision 1.3 1997/11/10 15:10:19 tkld
;; Update commentary. Support sendmail.el. Support signing or encrypting.
;;
;; Revision 1.2 1997/11/10 14:27:07 tkld
;; Remembered to widen buffer before encrypting.
;;
;; Revision 1.1 1997/11/10 14:22:06 tkld
;; Initial revision
;;
;;; Code:
(require 'message)
(require 'bbdb)
(require 'mailcrypt)
(defconst bbdb/pgp-version (substring "$Revision$" 11 -2)
"$Id$
Report bugs to: Kevin Davidson tkld@quadstone.com")
(defvar bbdb/pgp-field 'pgp-mail
"*Field to use in BBDB to store PGP preferences.
If this field's value in a record is \"encrypt\" then messages are
encrypted. If it is \"sign\" then messages are signed.")
(defvar bbdb/pgp-default-action nil
"*Default action when sending a message and the recipient is not in BBDB.
nil means do nothing.
'encrypt means encrypt message.
'sign means sign message.")
(defun bbdb/pgp-get-pgp (name address)
"Look up user NAME and ADDRESS in BBDB and return the PGP preference."
(let* ((record (bbdb-search-simple name address))
(pgp (and record
(bbdb-record-getprop record bbdb/pgp-field))))
pgp))
(defun bbdb/pgp-hook-fun ()
"Function to be added to message-send-hook
Uses PGP to encrypt messages to users marked in the BBDB with the
field `bbdb/pgp-field'.
The user is prompted before encryption or signing."
(save-restriction
(save-excursion
(message-narrow-to-headers)
(and (featurep 'mailalias)
(not (featurep 'mailabbrev))
mail-aliases
(expand-mail-aliases (point-min) (point-max)))
(let* ((to-field (mail-fetch-field "To" nil t))
(address (mail-extract-address-components (or to-field ""))))
(widen)
(if (not (equal address '(nil nil)))
(let ((pgp-p (bbdb/pgp-get-pgp (car address) (car (cdr address)))))
(cond
((string= "encrypt" pgp-p)
(and (y-or-n-p "Encrypt message ? ")
(mc-encrypt 0)))
((string= "sign" pgp-p)
(and (y-or-n-p "Sign message ? ")
(mc-sign 0)))
(t
(cond
((eq bbdb/pgp-default-action 'encrypt)
(and (y-or-n-p "Encrypt message ? ")
(mc-encrypt 0)))
((eq bbdb/pgp-default-action 'sign)
(and (y-or-n-p "Sign message ? ")
(mc-sign 0)))
(t
nil))))))))))
(add-hook 'message-send-hook 'bbdb/pgp-hook-fun)
(add-hook 'mail-send-hook 'bbdb/pgp-hook-fun)
(provide 'bbdb-pgp)
;;; BBDB-PGP.EL ends here
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