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Diffstat (limited to 'jabber-ft-server.el')
| -rw-r--r-- | jabber-ft-server.el | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/jabber-ft-server.el b/jabber-ft-server.el new file mode 100644 index 0000000..b2afceb --- /dev/null +++ b/jabber-ft-server.el @@ -0,0 +1,131 @@ +;; jabber-ft-server.el - handle incoming file transfers, by JEP-0096 + +;; Copyright (C) 2003, 2004, 2007 - Magnus Henoch - mange@freemail.hu +;; Copyright (C) 2002, 2003, 2004 - tom berger - object@intelectronica.net + +;; This file is a part of jabber.el. + +;; This program 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 2 of the License, or +;; (at your option) any later version. + +;; This program 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 this program; if not, write to the Free Software +;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +(require 'jabber-si-server) +(require 'jabber-util) + +(defvar jabber-ft-sessions nil + "Alist, where keys are (sid jid), and values are buffers of the files.") + +(defvar jabber-ft-size nil + "Size of the file that is being downloaded") + +(defvar jabber-ft-md5-hash nil + "MD5 hash of the file that is being downloaded") + +(jabber-disco-advertise-feature "http://jabber.org/protocol/si/profile/file-transfer") + +(add-to-list 'jabber-si-profiles + (list "http://jabber.org/protocol/si/profile/file-transfer" + 'jabber-ft-accept + 'jabber-ft-server-connected)) + +(defun jabber-ft-accept (jc xml-data) + "Receive IQ stanza containing file transfer request, ask user" + (let* ((from (jabber-xml-get-attribute xml-data 'from)) + (query (jabber-iq-query xml-data)) + (si-id (jabber-xml-get-attribute query 'id)) + ;; TODO: check namespace + (file (car (jabber-xml-get-children query 'file))) + (name (jabber-xml-get-attribute file 'name)) + (size (jabber-xml-get-attribute file 'size)) + (date (jabber-xml-get-attribute file 'date)) + (md5-hash (jabber-xml-get-attribute file 'hash)) + (desc (car (jabber-xml-node-children + (car (jabber-xml-get-children file 'desc))))) + (range (car (jabber-xml-get-children file 'range)))) + (unless (and name size) + ;; both name and size must be present + (jabber-signal-error "modify" 'bad-request)) + + (let ((question (format + "%s is sending you the file %s (%s bytes).%s Accept? " + (jabber-jid-displayname from) + name + size + (if (not (zerop (length desc))) + (concat " Description: '" desc "'") + "")))) + (unless (yes-or-no-p question) + (jabber-signal-error "cancel" 'forbidden))) + + ;; default is to save with given name, in current directory. + ;; maybe that's bad; maybe should be customizable. + (let* ((file-name (read-file-name "Download to: " nil nil nil name)) + (buffer (create-file-buffer file-name))) + (message "Starting download of %s..." (file-name-nondirectory file-name)) + (with-current-buffer buffer + (kill-all-local-variables) + (setq buffer-file-coding-system 'binary) + ;; For Emacs, switch buffer to unibyte _before_ anything goes into it, + ;; otherwise binary files are corrupted. For XEmacs, it isn't needed, + ;; and it also doesn't have set-buffer-multibyte. + (if (fboundp 'set-buffer-multibyte) + (set-buffer-multibyte nil)) + (set-visited-file-name file-name t) + (set (make-local-variable 'jabber-ft-size) + (string-to-number size)) + (set (make-local-variable 'jabber-ft-md5-hash) + md5-hash)) + (add-to-list 'jabber-ft-sessions + (cons (list si-id from) buffer))) + + ;; to support range, return something sensible here + nil)) + +(defun jabber-ft-server-connected (jc jid sid send-data-function) + ;; We don't really care about the send-data-function. But if it's + ;; a string, it means that we have no connection. + (if (stringp send-data-function) + (message "File receiving failed: %s" send-data-function) + ;; On success, we just return our data receiving function. + 'jabber-ft-data)) + +(defun jabber-ft-data (jc jid sid data) + "Receive chunk of transferred file." + (let ((buffer (cdr (assoc (list sid jid) jabber-ft-sessions)))) + (with-current-buffer buffer + ;; If data is nil, there is no more data. + ;; But maybe the remote entity doesn't close the stream - + ;; then we have to keep track of file size to know when to stop. + ;; Return value is whether to keep connection open. + (when data + (insert data)) + (if (and data (< (buffer-size) jabber-ft-size)) + t + (basic-save-buffer) + (if (and jabber-ft-md5-hash + (let ((file-hash (jabber-ft-get-md5 buffer-file-name))) + (and file-hash + (not (string= file-hash jabber-ft-md5-hash))))) + ;; hash mismatch! + (progn + (message "%s downloaded - CHECKSUM MISMATCH!" + (file-name-nondirectory buffer-file-name)) + (sleep-for 5)) + ;; all is fine + (message "%s downloaded" (file-name-nondirectory buffer-file-name))) + (kill-buffer buffer) + nil)))) + +(provide 'jabber-ft-server) + +;;; arch-tag: 334adcff-6210-496e-8382-8f49ae0248a1 |