lisp/gnus/mm-extern.el

   1 ;;; mm-extern.el --- showing message/external-body
   2
   3 ;; Copyright (C) 2000-2015 Free Software Foundation, Inc.
   4
   5 ;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
   6 ;; Keywords: message external-body
   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 ;;; Code:
  26
  27 (eval-when-compile (require 'cl))
  28
  29 (require 'mm-util)
  30 (require 'mm-decode)
  31 (require 'mm-url)
  32
  33 (defvar gnus-article-mime-handles)
  34
  35 (defvar mm-extern-function-alist
  36   '((local-file . mm-extern-local-file)
  37     (url . mm-extern-url)
  38     (anon-ftp . mm-extern-anon-ftp)
  39     (ftp . mm-extern-ftp)
  40 ;;;     (tftp . mm-extern-tftp)
  41     (mail-server . mm-extern-mail-server)
  42 ;;;     (afs . mm-extern-afs))
  43     ))
  44
  45 (defvar mm-extern-anonymous "anonymous")
  46
  47 (defun mm-extern-local-file (handle)
  48   (erase-buffer)
  49   (let ((name (cdr (assq 'name (cdr (mm-handle-type handle)))))
  50         (coding-system-for-read mm-binary-coding-system))
  51     (unless name
  52       (error "The filename is not specified"))
  53     (mm-disable-multibyte)
  54     (if (file-exists-p name)
  55         (mm-insert-file-contents name nil nil nil nil t)
  56       (error "File %s is gone" name))))
  57
  58 (defun mm-extern-url (handle)
  59   (erase-buffer)
  60   (let ((url (cdr (assq 'url (cdr (mm-handle-type handle)))))
  61         (name buffer-file-name)
  62         (coding-system-for-read mm-binary-coding-system))
  63     (unless url
  64       (error "URL is not specified"))
  65     (mm-disable-multibyte)
  66     (mm-url-insert-file-contents url)
  67     (setq buffer-file-name name)))
  68
  69 (defun mm-extern-anon-ftp (handle)
  70   (erase-buffer)
  71   (let* ((params (cdr (mm-handle-type handle)))
  72          (name (cdr (assq 'name params)))
  73          (site (cdr (assq 'site params)))
  74          (directory (cdr (assq 'directory params)))
  75          (mode (cdr (assq 'mode params)))
  76          (path (concat "/" (or mm-extern-anonymous
  77                                (read-string (format "ID for %s: " site)))
  78                        "@" site ":" directory "/" name))
  79          (coding-system-for-read mm-binary-coding-system))
  80     (unless name
  81       (error "The filename is not specified"))
  82     (mm-disable-multibyte)
  83     (mm-insert-file-contents path nil nil nil nil t)))
  84
  85 (defun mm-extern-ftp (handle)
  86   (let (mm-extern-anonymous)
  87     (mm-extern-anon-ftp handle)))
  88
  89 (declare-function message-goto-body "message" ())
  90
  91 (defun mm-extern-mail-server (handle)
  92   (require 'message)
  93   (let* ((params (cdr (mm-handle-type handle)))
  94          (server (cdr (assq 'server params)))
  95          (subject (or (cdr (assq 'subject params)) "none"))
  96          (buf (current-buffer))
  97          info)
  98     (if (y-or-n-p (format "Send a request message to %s? " server))
  99         (save-window-excursion
 100           (message-mail server subject)
 101           (message-goto-body)
 102           (delete-region (point) (point-max))
 103           (insert-buffer-substring buf)
 104           (message "Requesting external body...")
 105           (message-send-and-exit)
 106           (setq info "Request is sent.")
 107           (message info))
 108       (setq info "Request is not sent."))
 109     (goto-char (point-min))
 110     (insert "[" info "]\n\n")))
 111
 112 ;;;###autoload
 113 (defun mm-extern-cache-contents (handle)
 114   "Put the external-body part of HANDLE into its cache."
 115   (let* ((access-type (cdr (assq 'access-type
 116                                  (cdr (mm-handle-type handle)))))
 117          (func (cdr (assq (intern
 118                            (downcase
 119                             (or access-type
 120                                 (error "Couldn't find access type"))))
 121                           mm-extern-function-alist)))
 122          handles)
 123     (unless func
 124       (error "Access type (%s) is not supported" access-type))
 125     (mm-with-part handle
 126       (goto-char (point-max))
 127       (insert "\n\n")
 128       ;; It should be just a single MIME handle.
 129       (setq handles (mm-dissect-buffer t)))
 130     (unless (bufferp (car handles))
 131       (mm-destroy-parts handles)
 132       (error "Multipart external body is not supported"))
 133     (with-current-buffer (mm-handle-buffer handles)
 134       (let (good)
 135         (unwind-protect
 136             (progn
 137               (funcall func handle)
 138               (setq good t))
 139           (unless good
 140             (mm-destroy-parts handles))))
 141       (mm-handle-set-cache handle handles))
 142     (setq gnus-article-mime-handles
 143           (mm-merge-handles gnus-article-mime-handles handles))))
 144
 145 ;;;###autoload
 146 (defun mm-inline-external-body (handle &optional no-display)
 147   "Show the external-body part of HANDLE.
 148 This function replaces the buffer of HANDLE with a buffer contains
 149 the entire message.
 150 If NO-DISPLAY is nil, display it. Otherwise, do nothing after replacing."
 151   (unless (mm-handle-cache handle)
 152     (mm-extern-cache-contents handle))
 153   (unless no-display
 154     (save-excursion
 155       (save-restriction
 156         (narrow-to-region (point) (point))
 157         (mm-display-part (mm-handle-cache handle))))
 158     ;; Move undisplayer added to the cached handle to the parent.
 159     (mm-handle-set-undisplayer
 160      handle (mm-handle-undisplayer (mm-handle-cache handle)))
 161     (mm-handle-set-undisplayer (mm-handle-cache handle) nil)))
 162
 163 (provide 'mm-extern)
 164
 165 ;;; mm-extern.el ends here