lisp/gnus/spam-wash.el

   1 ;;; spam-wash.el --- wash spam before analysis
   2
   3 ;; Copyright (C) 2004, 2007-2015 Free Software Foundation, Inc.
   4
   5 ;; Author: Andrew Cohen <cohen@andy.bu.edu>
   6 ;; Keywords: mail
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; This library decodes MIME encodings such as base64 and
  26 ;; quoted-printable to allow for better spam analysis.
  27 ;;
  28 ;; `spam-wash' should be called in a buffer containing the message.
  29
  30 ;;; Code:
  31
  32 (require 'gnus-art)
  33
  34 (defun spam-wash ()
  35   "Treat the current buffer prior to spam analysis."
  36   (interactive)
  37   (run-hooks 'gnus-article-decode-hook)
  38   (save-excursion
  39     (save-restriction
  40       (let* ((buffer-read-only  nil)
  41              (gnus-inhibit-treatment t)
  42              (gnus-article-buffer (current-buffer))
  43              (handles (or (mm-dissect-buffer nil gnus-article-loose-mime)
  44                           (and gnus-article-emulate-mime
  45                                (mm-uu-dissect))))
  46              handle)
  47           (when gnus-article-mime-handles
  48             (mm-destroy-parts gnus-article-mime-handles)
  49             (setq gnus-article-mime-handle-alist nil))
  50           (setq gnus-article-mime-handles handles)
  51           (when (and handles
  52                    (or (not (stringp (car handles)))
  53                        (cdr handles)))
  54                 (article-goto-body)
  55                 (delete-region (point) (point-max))
  56                 (spam-treat-parts handles))))))
  57
  58 (defun spam-treat-parts (handle)
  59   (if (stringp (car handle))
  60       (mapcar 'spam-treat-parts (cdr handle))
  61     (if (bufferp (car handle))
  62         (save-restriction
  63           (narrow-to-region (point) (point))
  64         (when (let ((case-fold-search t))
  65                 (string-match "text" (car (mm-handle-type handle))))
  66           (mm-insert-part handle))
  67           (goto-char (point-max)))
  68       (mapcar 'spam-treat-parts handle))))
  69
  70 (provide 'spam-wash)
  71
  72 ;;; spam-wash.el ends here