132 lines
5.0 KiB
EmacsLisp
132 lines
5.0 KiB
EmacsLisp
;; jabber-ft-server.el - handle incoming file transfers, by JEP-0096
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;; Copyright (C) 2003, 2004, 2007 - Magnus Henoch - mange@freemail.hu
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;; Copyright (C) 2002, 2003, 2004 - tom berger - object@intelectronica.net
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;; This file is a part of jabber.el.
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, write to the Free Software
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;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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(require 'jabber-si-server)
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(require 'jabber-util)
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(defvar jabber-ft-sessions nil
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"Alist, where keys are (sid jid), and values are buffers of the files.")
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(defvar jabber-ft-size nil
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"Size of the file that is being downloaded")
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(defvar jabber-ft-md5-hash nil
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"MD5 hash of the file that is being downloaded")
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(jabber-disco-advertise-feature "http://jabber.org/protocol/si/profile/file-transfer")
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(add-to-list 'jabber-si-profiles
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(list "http://jabber.org/protocol/si/profile/file-transfer"
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'jabber-ft-accept
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'jabber-ft-server-connected))
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(defun jabber-ft-accept (jc xml-data)
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"Receive IQ stanza containing file transfer request, ask user"
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(let* ((from (jabber-xml-get-attribute xml-data 'from))
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(query (jabber-iq-query xml-data))
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(si-id (jabber-xml-get-attribute query 'id))
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;; TODO: check namespace
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(file (car (jabber-xml-get-children query 'file)))
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(name (jabber-xml-get-attribute file 'name))
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(size (jabber-xml-get-attribute file 'size))
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(date (jabber-xml-get-attribute file 'date))
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(md5-hash (jabber-xml-get-attribute file 'hash))
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(desc (car (jabber-xml-node-children
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(car (jabber-xml-get-children file 'desc)))))
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(range (car (jabber-xml-get-children file 'range))))
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(unless (and name size)
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;; both name and size must be present
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(jabber-signal-error "modify" 'bad-request))
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(let ((question (format
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"%s is sending you the file %s (%s bytes).%s Accept? "
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(jabber-jid-displayname from)
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name
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size
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(if (not (zerop (length desc)))
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(concat " Description: '" desc "'")
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""))))
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(unless (yes-or-no-p question)
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(jabber-signal-error "cancel" 'forbidden)))
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;; default is to save with given name, in current directory.
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;; maybe that's bad; maybe should be customizable.
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(let* ((file-name (read-file-name "Download to: " nil nil nil name))
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(buffer (create-file-buffer file-name)))
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(message "Starting download of %s..." (file-name-nondirectory file-name))
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(with-current-buffer buffer
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(kill-all-local-variables)
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(setq buffer-file-coding-system 'binary)
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;; For Emacs, switch buffer to unibyte _before_ anything goes into it,
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;; otherwise binary files are corrupted. For XEmacs, it isn't needed,
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;; and it also doesn't have set-buffer-multibyte.
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(if (fboundp 'set-buffer-multibyte)
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(set-buffer-multibyte nil))
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(set-visited-file-name file-name t)
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(set (make-local-variable 'jabber-ft-size)
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(string-to-number size))
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(set (make-local-variable 'jabber-ft-md5-hash)
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md5-hash))
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(add-to-list 'jabber-ft-sessions
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(cons (list si-id from) buffer)))
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;; to support range, return something sensible here
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nil))
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(defun jabber-ft-server-connected (jc jid sid send-data-function)
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;; We don't really care about the send-data-function. But if it's
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;; a string, it means that we have no connection.
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(if (stringp send-data-function)
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(message "File receiving failed: %s" send-data-function)
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;; On success, we just return our data receiving function.
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'jabber-ft-data))
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(defun jabber-ft-data (jc jid sid data)
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"Receive chunk of transferred file."
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(let ((buffer (cdr (assoc (list sid jid) jabber-ft-sessions))))
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(with-current-buffer buffer
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;; If data is nil, there is no more data.
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;; But maybe the remote entity doesn't close the stream -
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;; then we have to keep track of file size to know when to stop.
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;; Return value is whether to keep connection open.
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(when data
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(insert data))
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(if (and data (< (buffer-size) jabber-ft-size))
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t
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(basic-save-buffer)
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(if (and jabber-ft-md5-hash
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(let ((file-hash (jabber-ft-get-md5 buffer-file-name)))
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(and file-hash
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(not (string= file-hash jabber-ft-md5-hash)))))
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;; hash mismatch!
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(progn
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(message "%s downloaded - CHECKSUM MISMATCH!"
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(file-name-nondirectory buffer-file-name))
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(sleep-for 5))
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;; all is fine
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(message "%s downloaded" (file-name-nondirectory buffer-file-name)))
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(kill-buffer buffer)
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nil))))
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(provide 'jabber-ft-server)
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;;; arch-tag: 334adcff-6210-496e-8382-8f49ae0248a1
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