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;;; helm-epa.el --- helm interface for epa/epg
;; Copyright (C) 2012 ~ 2020 Thierry Volpiatto <thievol@posteo.net>
;; 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 3 of the License, 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.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(require 'helm)
(eval-when-compile (require 'epg))
(defvar epa-protocol)
(defvar epa-last-coding-system-specified)
(defvar epg-key-validity-alist)
(defvar mail-header-separator)
(declare-function epg-list-keys "epg")
(declare-function epg-make-context "epg")
(declare-function epg-key-sub-key-list "epg")
(declare-function epg-sub-key-id "epg")
(declare-function epg-key-user-id-list "epg")
(declare-function epg-user-id-string "epg")
(declare-function epg-user-id-validity "epg")
(declare-function epa-sign-region "epa")
(declare-function epa--read-signature-type "epa")
(declare-function epa-display-error "epa")
(declare-function epg-export-keys-to-string "epg")
(declare-function epg-context-armor "epg")
(declare-function epg-context-set-armor "epg")
(declare-function epg-delete-keys "epg")
(declare-function helm-read-file-name "helm-mode")
(defvar helm-epa--list-only-secrets nil
"[INTERNAL] Used to pass MODE argument to `epg-list-keys'.")
(defcustom helm-epa-actions '(("Show key" . epa--show-key)
("encrypt file with key" . helm-epa-encrypt-file)
("Copy keys to kill ring" . helm-epa-kill-keys-armor)
("Delete keys" . helm-epa-delete-keys))
"Actions for `helm-epa-list-keys'."
:type '(alist :key-type string :value-type symbol)
:group 'helm-misc)
(defclass helm-epa (helm-source-sync)
((init :initform (lambda ()
(require 'epg)
(require 'epa)))
(candidates :initform 'helm-epa-get-key-list)
(keymap :initform helm-comp-read-map)
(mode-line :initform helm-comp-read-mode-line))
"Allow building helm sources for GPG keys.")
(defun helm-epa-get-key-list (&optional keys)
"Build candidate list for `helm-epa-list-keys'."
(cl-loop with all-keys = (or keys (epg-list-keys (epg-make-context epa-protocol)
nil helm-epa--list-only-secrets))
for key in all-keys
for sublist = (car (epg-key-sub-key-list key))
for subkey-id = (epg-sub-key-id sublist)
for uid-list = (epg-key-user-id-list key)
for uid = (epg-user-id-string (car uid-list))
for validity = (epg-user-id-validity (car uid-list))
collect (cons (format " %s %s %s"
(helm-aif (rassq validity epg-key-validity-alist)
(string (car it))
"?")
(propertize
subkey-id
'face (cl-case validity
(none 'epa-validity-medium)
((revoked expired)
'epa-validity-disabled)
(t 'epa-validity-high)))
(propertize
uid 'face 'font-lock-warning-face))
key)))
(defun helm-epa--select-keys (prompt keys)
"A helm replacement for `epa--select-keys'."
(let ((result (helm :sources (helm-make-source "Epa select keys" 'helm-epa
:candidates (lambda ()
(helm-epa-get-key-list keys)))
:prompt (and prompt (helm-epa--format-prompt prompt))
:buffer "*helm epa*")))
(unless (equal result "")
result)))
(defun helm-epa--format-prompt (prompt)
(let ((split (split-string prompt "\n")))
(if (cdr split)
(format "%s\n(%s): "
(replace-regexp-in-string "\\.[\t ]*\\'" "" (car split))
(replace-regexp-in-string "\\.[\t ]*\\'" "" (cadr split)))
(format "%s: " (replace-regexp-in-string "\\.[\t ]*\\'" "" (car split))))))
(defun helm-epa--read-signature-type ()
"A helm replacement for `epa--read-signature-type'."
(let ((answer (helm-read-answer "Signature type:
(n - Create a normal signature)
(c - Create a cleartext signature)
(d - Create a detached signature)"
'("n" "c" "d"))))
(helm-acase answer
("n" 'normal)
("c" 'clear)
("d" 'detached))))
(defun helm-epa-collect-keys-from-candidates (candidates)
(cl-loop for c in candidates
collect (epg-sub-key-id
(car (epg-key-sub-key-list c)))))
(defun helm-epa-collect-id-from-candidates (candidates)
(cl-loop for c in candidates
collect (epg-user-id-string
(car (epg-key-user-id-list c)))))
(defun helm-epa-success-message (str keys ids)
(message str
(mapconcat (lambda (pair)
(concat (car pair) " " (cdr pair)))
(cl-loop for k in keys
for i in ids
collect (cons k i))
"\n")))
;;;###autoload
(define-minor-mode helm-epa-mode
"Enable helm completion on gpg keys in epa functions."
:group 'helm-misc
:global t
(require 'epa)
(if helm-epa-mode
(progn
(advice-add 'epa--select-keys :override #'helm-epa--select-keys)
(advice-add 'epa--read-signature-type :override #'helm-epa--read-signature-type))
(advice-remove 'epa-select-keys #'helm-epa--select-keys)
(advice-remove 'epa--read-signature-type #'helm-epa--read-signature-type)))
(defun helm-epa-action-transformer (actions _candidate)
"Helm epa action transformer function."
(cond ((with-helm-current-buffer
(derived-mode-p 'message-mode 'mail-mode))
(helm-append-at-nth
actions '(("Sign mail with key" . helm-epa-mail-sign)
("Encrypt mail with key" . helm-epa-mail-encrypt))
3))
(t actions)))
(defun helm-epa-delete-keys (_candidate)
"Delete gpg marked keys from helm-epa."
(let ((context (epg-make-context epa-protocol))
(keys (helm-marked-candidates)))
(message "Deleting gpg keys..")
(condition-case error
(epg-delete-keys context keys)
(error
(epa-display-error context)
(signal (car error) (cdr error))))
(message "Deleting gpg keys done")))
(defun helm-epa-encrypt-file (candidate)
"Select a file to encrypt with key CANDIDATE."
(let* ((file (helm-read-file-name "Encrypt file: "))
(cands (helm-marked-candidates))
(keys (helm-epa-collect-keys-from-candidates cands))
(ids (helm-epa-collect-id-from-candidates cands)))
(epa-encrypt-file file cands)
(helm-epa-success-message "File encrypted with key(s):\n %s"
keys ids)))
(defun helm-epa-kill-keys-armor (_candidate)
"Copy marked keys to kill ring."
(let ((keys (helm-marked-candidates))
(context (epg-make-context epa-protocol)))
(with-no-warnings
(setf (epg-context-armor context) t))
(condition-case error
(kill-new (epg-export-keys-to-string context keys))
(error
(epa-display-error context)
(signal (car error) (cdr error))))))
(defun helm-epa-mail-sign (candidate)
"Sign email with key CANDIDATE."
(let ((key (epg-sub-key-id (car (epg-key-sub-key-list candidate))))
(id (epg-user-id-string (car (epg-key-user-id-list candidate))))
start end mode)
(save-excursion
(goto-char (point-min))
(if (search-forward mail-header-separator nil t)
(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))
(setq start (point)
end (point-max)
mode (if verbose
(epa--read-signature-type)
'clear))))
;; TODO Make non-interactive functions to replace epa-sign-region
;; and epa-encrypt-region and inline them.
(with-no-warnings
(epa-sign-region start end candidate mode))
(message "Mail signed with key `%s %s'" key id)))
(defun helm-epa-mail-encrypt (candidate)
"Encrypt email with key CANDIDATE."
(let ((cands (helm-marked-candidates))
start end)
(save-excursion
(goto-char (point-min))
(when (search-forward mail-header-separator nil t)
(forward-line))
(setq start (point)
end (point-max))
(setq epa-last-coding-system-specified
(or coding-system-for-write
(select-safe-coding-system start end))))
;; Don't let some read-only text stop us from encrypting.
(let ((inhibit-read-only t)
(keys (helm-epa-collect-keys-from-candidates cands))
(ids (helm-epa-collect-id-from-candidates cands)))
(with-no-warnings
(epa-encrypt-region start end cands nil nil))
(helm-epa-success-message "Mail encrypted with key(s):\n %s"
keys ids))))
;;;###autoload
(defun helm-epa-list-keys ()
"List all gpg keys.
This is the helm interface for `epa-list-keys'."
(interactive)
(helm :sources
(helm-make-source "Epg list keys" 'helm-epa
:action-transformer 'helm-epa-action-transformer
:action 'helm-epa-actions)
:buffer "*helm epg list keys*"))
(provide 'helm-epa)
;;; helm-epa.el ends here
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