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;;; jao-mullvad.el --- Calling the mullvad cli -*- lexical-binding: t; -*-
;; Copyright (C) 2021 jao
;; Author: jao <mail@jao.io>
;; Keywords: processes
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Simple helpers to call mullvad and parse its output
;;; Code:
(defvar jao-mullvad-mode-map
(let ((map (make-keymap)))
(suppress-keymap map)
(define-key map [?q] 'bury-buffer)
(define-key map [?n] 'next-line)
(define-key map [?p] 'previous-line)
(define-key map [?g] 'jao-mullvad-status)
(define-key map [?l] 'jao-mullvad-list)
(define-key map [?u] 'jao-mullvad-update-list)
(define-key map [?r] 'jao-mullvad-reconnect)
(define-key map [?R] 'jao-mullvad-set-relay)
(define-key map [?d] 'jao-mullvad-disconnect)
(define-key map [?c] 'jao-mullvad-connect)
map))
(defvar jao-mullvad--buffer "*mullvad*")
;;;###autoload
(defun jao-mullvad-mode ()
"A very simple mode to show the output of mulvad commands."
(interactive)
(kill-all-local-variables)
(buffer-disable-undo)
(use-local-map jao-mullvad-mode-map)
;; (setq-local font-lock-defaults '(jao-jao-mullvad-font-lock-keywords))
(setq-local truncate-lines t)
(setq-local next-line-add-newlines nil)
(setq major-mode 'jao-mullvad-mode)
(setq mode-name "mullvad")
(read-only-mode 1))
(defun jao-mullvad--do (things &optional buffer)
"Execute a mullvad command THINGS in the given BUFFER."
(let ((b (or buffer (pop-to-buffer (get-buffer-create jao-mullvad--buffer)))))
(let ((inhibit-read-only t)
(cmd (format "mullvad %s" things)))
(delete-region (point-min) (point-max))
(message "Running: %s ...." cmd)
(shell-command cmd b)
(message ""))
(jao-mullvad-mode)))
(defconst jao-mullvad--country-rx "^\\([^ \t\n]+ (...?)\\)$")
(defconst jao-mullvad--city-rx " \\([^ (]+ (...)\\)")
(defun jao-mullvad--list ()
"Compute an alist of available relay countries with their cities."
(with-temp-buffer
(jao-mullvad--do "relay list" (current-buffer))
(goto-char (point-min))
(let ((countries) (country))
(while (not (eobp))
(cond ((looking-at jao-mullvad--country-rx)
(when country
(setq countries (cons (reverse country) countries)))
(setq country (list (match-string 1))))
((looking-at jao-mullvad--city-rx)
(setq country (cons (match-string 1) country))))
(forward-line 1))
(reverse countries))))
;;;###autoload
(defun jao-mullvad-status ()
"Display mullvad connection status, including country, city and server."
(interactive)
(jao-mullvad--do "status")
(when (re-search-forward "[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+" nil t)
(let ((ip (match-string 0)) (country "") (city "") (server ""))
(with-temp-buffer
(jao-mullvad--do "relay list" (current-buffer))
(goto-char (point-min))
(when (search-forward ip nil t)
(beginning-of-line)
(when (looking-at "\t\t\\([^( ]+\\) (")
(setq server (match-string 1)))
(when (re-search-backward jao-mullvad--city-rx nil t)
(setq city (string-trim (match-string 0))))
(when (re-search-backward jao-mullvad--country-rx nil t)
(setq country (match-string 0)))))
(let ((inhibit-read-only t))
(forward-line 1)
(insert "Connected to " country " " city " - " server "\n")
(goto-char (point-min))))))
;;;###autoload
(defun jao-mullvad-set-relay ()
"Choose a country and city and set them to the default relay location."
(interactive)
(let* ((cc (jao-mullvad--list))
(country (completing-read "Country: " (mapcar #'car cc) nil t))
(city (completing-read "City: " (cdr (assoc country cc #'string=))))
(cntr (and (string-match "(\\(...?\\))" country) (match-string 1 country)))
(code (and (string-match "(\\(...\\))" city) (match-string 1 city))))
(when (y-or-n-p (format "Set location to %s / %s?" country city))
(jao-mullvad--do (format "relay set location %s %s" cntr code)))))
;;;###autoload
(defun jao-mullvad-connect ()
"Connect to mullvad VPM, with the current configuration."
(interactive)
(jao-mullvad--do "connect && sudo service postfix restart"))
;;;###autoload
(defun jao-mullvad-reconnect ()
"Ask mullvad to reconnect."
(interactive)
(jao-mullvad--do "reconnect && sudo service postfix restart"))
;;;###autoload
(defun jao-mullvad-disconnect ()
"Ask mullvad to disconnect, after confirmation."
(interactive)
(when (y-or-n-p "Disconnect?") (jao-mullvad--do "disconnect")))
;;;###autoload
(defun jao-mullvad-list ()
"List all available relay locations."
(interactive)
(jao-mullvad--do "relay list"))
;;;###autoload
(defun jao-mullvad-update-list ()
"Update list of available relay locations (background operation)."
(interactive)
(jao-mullvad--do "relay update"))
(provide 'jao-mullvad)
;;; jao-mullvad.el ends here
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