Import Gnus subtree

[packages] / xemacs-packages / gnus / lisp / spam-wash.el

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+;;; spam-wash.el --- wash spam before analysis
+
+;; Copyright (C) 2004, 2007-2016 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 <http://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