lisp/url/url-cid.el

   1 ;;; url-cid.el --- Content-ID URL loader
   2
   3 ;; Copyright (C) 1998-1999, 2004-2017 Free Software Foundation, Inc.
   4
   5 ;; Keywords: comm, data, processes
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software: you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation, either version 3 of the License, or
  12 ;; (at your option) any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Code:
  23
  24 (require 'url-vars)
  25 (require 'url-parse)
  26
  27 (require 'mm-decode)
  28
  29 (defun url-cid-gnus (cid)
  30   (let ((content-type nil)
  31         (encoding nil)
  32         (part nil)
  33         (data nil))
  34     (setq part (mm-get-content-id cid))
  35     (if (not part)
  36         (message "Unknown CID encountered: %s" cid)
  37       (setq data (with-current-buffer (mm-handle-buffer part)
  38                    (buffer-string))
  39             content-type (mm-handle-type part)
  40             encoding (symbol-name (mm-handle-encoding part)))
  41       (if (= 0 (length content-type)) (setq content-type "text/plain"))
  42       (if (= 0 (length encoding)) (setq encoding "8bit"))
  43       (if (listp content-type)
  44           (setq content-type (car content-type)))
  45       (insert (format "Content-length: %d\r\n"  (length data))
  46               "Content-type: " content-type "\r\n"
  47               "Content-transfer-encoding: " encoding "\r\n"
  48               "\r\n"
  49               (or data "")))))
  50
  51 ;;;###autoload
  52 (defun url-cid (url)
  53   (cond
  54    ((fboundp 'mm-get-content-id)
  55     ;; Using Pterodactyl Gnus or later
  56     (with-current-buffer (generate-new-buffer " *url-cid*")
  57       (url-cid-gnus (url-filename url))))
  58    (t
  59     (message "Unable to handle CID URL: %s" url))))
  60
  61 ;;; url-cid.el ends here