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;;; spam-wash.el --- wash spam before analysis -*- lexical-binding: t; -*-
;; Copyright (C) 2004, 2007-2025 Free Software Foundation, Inc.
;; Author: Andrew Cohen <cohen@andy.bu.edu>
;; Keywords: mail
;; 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/>.
;;; Commentary:
;; This library decodes MIME encodings such as base64 and
;; quoted-printable to allow for better spam analysis.
;;
;; `spam-wash' should be called in a buffer containing the message.
;;; Code:
(require 'gnus-art)
(defun spam-wash ()
"Treat the current buffer prior to spam analysis."
(interactive)
(run-hooks 'gnus-article-decode-hook)
(save-excursion
(save-restriction
(let* ((buffer-read-only nil)
(gnus-inhibit-treatment t)
(gnus-article-buffer (current-buffer))
(handles (or (mm-dissect-buffer nil gnus-article-loose-mime)
(and gnus-article-emulate-mime
(mm-uu-dissect))))
) ;; handle
(when gnus-article-mime-handles
(mm-destroy-parts gnus-article-mime-handles)
(setq gnus-article-mime-handle-alist nil))
(setq gnus-article-mime-handles handles)
(when (and handles
(or (not (stringp (car handles)))
(cdr handles)))
(article-goto-body)
(delete-region (point) (point-max))
(spam-treat-parts handles))))))
(defun spam-treat-parts (handle)
(if (stringp (car handle))
(mapcar #'spam-treat-parts (cdr handle))
(if (bufferp (car handle))
(save-restriction
(narrow-to-region (point) (point))
(when (let ((case-fold-search t))
(string-match "text" (car (mm-handle-type handle))))
(mm-insert-part handle))
(goto-char (point-max)))
(mapcar #'spam-treat-parts handle))))
(provide 'spam-wash)
;;; spam-wash.el ends here
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