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;;; mm-extern.el --- showing message/external-body -*- lexical-binding:t -*-
;; Copyright (C) 2000-2025 Free Software Foundation, Inc.
;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
;; Keywords: message external-body
;; 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:
;;; Code:
(require 'mm-util)
(require 'mm-decode)
(require 'mm-url)
(defvar gnus-article-mime-handles)
(defvar mm-extern-function-alist
`((local-file . ,#'mm-extern-local-file)
(url . ,#'mm-extern-url)
(anon-ftp . ,#'mm-extern-anon-ftp)
(ftp . ,#'mm-extern-ftp)
;; (tftp . ,#'mm-extern-tftp)
(mail-server . ,#'mm-extern-mail-server)
;; (afs . ,#'mm-extern-afs))
))
(defvar mm-extern-anonymous "anonymous")
(defun mm-extern-local-file (handle)
(erase-buffer)
(let ((name (cdr (assq 'name (cdr (mm-handle-type handle)))))
(coding-system-for-read mm-binary-coding-system))
(unless name
(error "The filename is not specified"))
(mm-disable-multibyte)
(if (file-exists-p name)
(mm-insert-file-contents name nil nil nil nil t)
(error "File %s is gone" name))))
(defun mm-extern-url (handle)
(erase-buffer)
(let ((url (cdr (assq 'url (cdr (mm-handle-type handle)))))
(name buffer-file-name)
(coding-system-for-read mm-binary-coding-system))
(unless url
(error "URL is not specified"))
(mm-disable-multibyte)
(mm-url-insert-file-contents url)
(setq buffer-file-name name)))
(defun mm-extern-anon-ftp (handle)
(erase-buffer)
(let* ((params (cdr (mm-handle-type handle)))
(name (cdr (assq 'name params)))
(site (cdr (assq 'site params)))
(directory (cdr (assq 'directory params)))
(path (concat "/" (or mm-extern-anonymous
(read-string (format "ID for %s: " site)))
"@" site ":" directory "/" name))
(coding-system-for-read mm-binary-coding-system))
(unless name
(error "The filename is not specified"))
(mm-disable-multibyte)
(mm-insert-file-contents path nil nil nil nil t)))
(defun mm-extern-ftp (handle)
(let (mm-extern-anonymous)
(mm-extern-anon-ftp handle)))
(declare-function message-goto-body "message" (&optional interactive))
(defun mm-extern-mail-server (handle)
(require 'message)
(let* ((params (cdr (mm-handle-type handle)))
(server (cdr (assq 'server params)))
(subject (or (cdr (assq 'subject params)) "none"))
(buf (current-buffer))
info)
(if (y-or-n-p (format "Send a request message to %s? " server))
(save-window-excursion
(message-mail server subject)
(message-goto-body)
(delete-region (point) (point-max))
(insert-buffer-substring buf)
(message "Requesting external body...")
(message-send-and-exit)
(setq info "Request is sent.")
(message info))
(setq info "Request is not sent."))
(goto-char (point-min))
(insert "[" info "]\n\n")))
;;;###autoload
(defun mm-extern-cache-contents (handle)
"Put the external-body part of HANDLE into its cache."
(let* ((access-type (cdr (assq 'access-type
(cdr (mm-handle-type handle)))))
(func (cdr (assq (intern
(downcase
(or access-type
(error "Couldn't find access type"))))
mm-extern-function-alist)))
handles)
(unless func
(error "Access type (%s) is not supported" access-type))
(mm-with-part handle
(goto-char (point-max))
(insert "\n\n")
;; It should be just a single MIME handle.
(setq handles (mm-dissect-buffer t)))
(unless (bufferp (car handles))
(mm-destroy-parts handles)
(error "Multipart external body is not supported"))
(with-current-buffer (mm-handle-buffer handles)
(let (good)
(unwind-protect
(progn
(funcall func handle)
(setq good t))
(unless good
(mm-destroy-parts handles))))
(mm-handle-set-cache handle handles))
(setq gnus-article-mime-handles
(mm-merge-handles gnus-article-mime-handles handles))))
;;;###autoload
(defun mm-inline-external-body (handle &optional no-display)
"Show the external-body part of HANDLE.
This function replaces the buffer of HANDLE with a buffer contains
the entire message.
If NO-DISPLAY is nil, display it. Otherwise, do nothing after replacing."
(unless (mm-handle-cache handle)
(mm-extern-cache-contents handle))
(unless no-display
(save-excursion
(save-restriction
(narrow-to-region (point) (point))
(mm-display-part (mm-handle-cache handle))))
;; Move undisplayer added to the cached handle to the parent.
(mm-handle-set-undisplayer
handle (mm-handle-undisplayer (mm-handle-cache handle)))
(mm-handle-set-undisplayer (mm-handle-cache handle) nil)))
(provide 'mm-extern)
;;; mm-extern.el ends here
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