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;;; epa-mail.el --- the EasyPG Assistant, minor-mode for mail composer -*- lexical-binding: t -*-
;; Copyright (C) 2006-2021 Free Software Foundation, Inc.
;; Author: Daiki Ueno <ueno@unixuser.org>
;; Keywords: PGP, GnuPG, mail, message
;; Package: epa
;; 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 <https://www.gnu.org/licenses/>.
;;; Code:
;;; Dependencies
(require 'epa)
(require 'mail-utils)
;;; Local Mode
(defvar epa-mail-mode-map
(let ((keymap (make-sparse-keymap)))
(define-key keymap "\C-c\C-ed" 'epa-mail-decrypt)
(define-key keymap "\C-c\C-ev" 'epa-mail-verify)
(define-key keymap "\C-c\C-es" 'epa-mail-sign)
(define-key keymap "\C-c\C-ee" 'epa-mail-encrypt)
(define-key keymap "\C-c\C-ei" 'epa-mail-import-keys)
(define-key keymap "\C-c\C-eo" 'epa-insert-keys)
(define-key keymap "\C-c\C-e\C-d" 'epa-mail-decrypt)
(define-key keymap "\C-c\C-e\C-v" 'epa-mail-verify)
(define-key keymap "\C-c\C-e\C-s" 'epa-mail-sign)
(define-key keymap "\C-c\C-e\C-e" 'epa-mail-encrypt)
(define-key keymap "\C-c\C-e\C-i" 'epa-mail-import-keys)
(define-key keymap "\C-c\C-e\C-o" 'epa-insert-keys)
keymap))
(defvar epa-mail-mode-hook nil)
(defvar epa-mail-mode-on-hook nil)
(defvar epa-mail-mode-off-hook nil)
(defcustom epa-mail-offer-skip t
"If non-nil, when a recipient has no key, ask whether to skip it.
Otherwise, signal an error."
:type 'boolean
:version "28.1"
:group 'epa-mail)
;;;###autoload
(define-minor-mode epa-mail-mode
"A minor-mode for composing encrypted/clearsigned mails."
:lighter " epa-mail")
;;; Utilities
(defun epa-mail--find-usable-key (keys usage)
"Find a usable key from KEYS for USAGE.
USAGE would be `sign' or `encrypt'."
(catch 'found
(while keys
(let ((pointer (epg-key-sub-key-list (car keys))))
(while pointer
(if (and (memq usage (epg-sub-key-capability (car pointer)))
(not (memq (epg-sub-key-validity (car pointer))
'(revoked expired))))
(throw 'found (car keys)))
(setq pointer (cdr pointer))))
(setq keys (cdr keys)))))
;;; Commands
;;;###autoload
(defun epa-mail-decrypt ()
"Decrypt OpenPGP armors in the current buffer.
The buffer is expected to contain a mail message."
(declare (interactive-only t))
(interactive)
(with-suppressed-warnings ((interactive-only epa-decrypt-armor-in-region))
(epa-decrypt-armor-in-region (point-min) (point-max))))
;;;###autoload
(defun epa-mail-verify ()
"Verify OpenPGP cleartext signed messages in the current buffer.
The buffer is expected to contain a mail message."
(declare (interactive-only t))
(interactive)
(with-suppressed-warnings ((interactive-only epa-verify-cleartext-in-region))
(epa-verify-cleartext-in-region (point-min) (point-max))))
;;;###autoload
(defun epa-mail-sign (start end signers mode)
"Sign the current buffer.
The buffer is expected to contain a mail message, and signing is
performed with your default key.
With prefix argument, asks you to select interactively the key to
use from your key ring."
(declare (interactive-only t))
(interactive
(save-excursion
(goto-char (point-min))
(rfc822-goto-eoh)
(unless (eobp)
(forward-line))
(setq epa-last-coding-system-specified
(or coding-system-for-write
(select-safe-coding-system (point) (point-max))))
(let ((verbose current-prefix-arg))
(list (point) (point-max)
(if verbose
(epa-select-keys (epg-make-context epa-protocol)
"Select keys for signing.
If no one is selected, default secret key is used. "
nil t))
(if verbose
(epa--read-signature-type)
'clear)))))
(let ((inhibit-read-only t))
(with-suppressed-warnings ((interactive-only epa-sign-region))
(epa-sign-region start end signers mode))))
(defun epa-mail-default-recipients ()
"Return the default list of encryption recipients for a mail buffer."
(let ((config (epg-find-configuration 'OpenPGP))
recipients-string real-recipients)
(save-excursion
(goto-char (point-min))
(save-restriction
(narrow-to-region (point)
(progn (rfc822-goto-eoh) (point)))
(setq recipients-string
(mapconcat #'identity
(nconc (mail-fetch-field "to" nil nil t)
(mail-fetch-field "cc" nil nil t)
(mail-fetch-field "bcc" nil nil t))
","))
(setq recipients-string
(mail-strip-quoted-names
(with-temp-buffer
(insert "to: " recipients-string "\n")
(expand-mail-aliases (point-min) (point-max))
(car (mail-fetch-field "to" nil nil t))))))
(setq real-recipients
(split-string recipients-string "," t "[ \t\n]*"))
;; Process all the recipients thru the list of GnuPG groups.
;; Expand GnuPG group names to what they stand for.
(setq real-recipients
(apply #'nconc
(mapcar
(lambda (recipient)
(or (epg-expand-group config recipient)
(list recipient)))
real-recipients)))
;; Process all the recipients thru the user's list
;; of encryption aliases.
(setq real-recipients
(apply #'nconc
(mapcar
(lambda (recipient)
(let ((tem (assoc (downcase recipient) epa-mail-aliases)))
(if tem (copy-sequence (cdr tem))
(list recipient))))
real-recipients)))
)))
;;;###autoload
(defun epa-mail-encrypt (&optional recipients signers)
"Encrypt the outgoing mail message in the current buffer.
Takes the recipients from the text in the header in the buffer
and translates them through `epa-mail-aliases'.
With prefix argument, asks you to select among them interactively
and also whether and how to sign.
Called from Lisp, the optional argument RECIPIENTS is a list
of recipient addresses, t to perform symmetric encryption,
or nil meaning use the defaults.
SIGNERS is a list of keys to sign the message with."
(interactive
(let ((verbose current-prefix-arg)
(context (epg-make-context epa-protocol)))
(list (if verbose
(or (epa-select-keys
context
"Select recipients for encryption.
If no one is selected, symmetric encryption will be performed. "
(epa-mail-default-recipients))
t))
(and verbose (y-or-n-p "Sign? ")
(epa-select-keys context
"Select keys for signing. ")))))
(let (start recipient-keys default-recipients)
(save-excursion
(setq recipient-keys
(cond ((eq recipients t)
nil)
(recipients recipients)
(t
(setq default-recipients
(epa-mail-default-recipients))
;; Convert recipients to keys.
(apply
'nconc
(mapcar
(lambda (recipient)
(let ((recipient-key
(epa-mail--find-usable-key
(epg-list-keys
(epg-make-context epa-protocol)
(if (string-search "@" recipient)
(concat "<" recipient ">")
recipient))
'encrypt)))
(unless (or recipient-key
(and epa-mail-offer-skip
(y-or-n-p
(format
"No public key for %s; skip it? "
recipient)))
)
(error "No public key for %s" recipient))
(if recipient-key (list recipient-key))))
default-recipients)))))
(goto-char (point-min))
(rfc822-goto-eoh)
(unless (eobp)
(forward-line))
(setq start (point))
(setq epa-last-coding-system-specified
(or coding-system-for-write
(select-safe-coding-system (point) (point-max)))))
;; Insert contents of requested attachments, if any.
(when (and (eq major-mode 'mail-mode) mail-encode-mml)
(mml-to-mime)
(setq mail-encode-mml nil))
;; Don't let some read-only text stop us from encrypting.
(let ((inhibit-read-only t))
(with-suppressed-warnings ((interactive-only epa-encrypt-region))
(epa-encrypt-region start (point-max)
recipient-keys signers signers)))))
;;;###autoload
(defun epa-mail-import-keys ()
"Import keys in the OpenPGP armor format in the current buffer.
The buffer is expected to contain a mail message."
(declare (interactive-only t))
(interactive)
(epa-import-armor-in-region (point-min) (point-max)))
;;; Global Mode
;;;###autoload
(define-minor-mode epa-global-mail-mode
"Minor mode to hook EasyPG into Mail mode."
:global t :init-value nil :group 'epa-mail :version "23.1"
(remove-hook 'mail-mode-hook 'epa-mail-mode)
(if epa-global-mail-mode
(add-hook 'mail-mode-hook 'epa-mail-mode)))
(provide 'epa-mail)
;;; epa-mail.el ends here
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