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	diff --git a/plugins/kolab_files/kolab_files.js b/plugins/kolab_files/kolab_files.js
	index 22adcceb..0a1073ed 100644
	--- a/plugins/kolab_files/kolab_files.js
	+++ b/plugins/kolab_files/kolab_files.js
	@@ -1,2263 +1,2265 @@
	/**
	* Kolab files plugin
	*
	* @author Aleksander Machniak <machniak@kolabsys.com>
	*
	* @licstart The following is the entire license notice for the
	* JavaScript code in this file.
	*
	* Copyright (C) 2011, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	* @licend The above is the entire license notice
	* for the JavaScript code in this file.
	*/

	window.rcmail && window.files_api && rcmail.addEventListener('init', function() {
	if (rcmail.task == 'mail') {
	// mail compose
	if (rcmail.env.action == 'compose') {
	var elem = $('#compose-attachments > div'),
	input = $('<input class="button" type="button">')
	.attr('tabindex', $('input', elem).attr('tabindex') \|\| 0)
	.val(rcmail.gettext('kolab_files.fromcloud'))
	.click(function() { kolab_files_selector_dialog(); })
	.appendTo(elem);

	if (rcmail.gui_objects.filelist) {
	rcmail.file_list = new rcube_list_widget(rcmail.gui_objects.filelist, {
	multiselect: true,
	keyboard: true,
	column_movable: false,
	dblclick_time: rcmail.dblclick_time
	});
	rcmail.file_list.addEventListener('select', function(o) { kolab_files_list_select(o); })
	.addEventListener('listupdate', function(e) { rcmail.triggerEvent('listupdate', e); });

	rcmail.gui_objects.filelist.parentNode.onmousedown = function(e){ return kolab_files_click_on_list(e); };
	rcmail.enable_command('files-sort', 'files-search', 'files-search-reset', true);

	rcmail.file_list.init();
	kolab_files_list_coltypes();
	}

	// register some commands to skip warning message on compose page
	$.merge(rcmail.env.compose_commands, ['files-list', 'files-sort', 'files-search', 'files-search-reset']);
	}
	// mail preview
	else if (rcmail.env.action == 'show' \|\| rcmail.env.action == 'preview') {
	var attachment_list = $('#attachment-list');

	if ($('li', attachment_list).length) {
	var link = $('<a href="#" class="button filesaveall">')
	.text(rcmail.gettext('kolab_files.saveall'))
	.click(function() { kolab_directory_selector_dialog(); })
	.insertAfter(attachment_list);
	}

	rcmail.addEventListener('menu-open', kolab_files_attach_menu_open);
	rcmail.enable_command('folder-create', true);
	}

	kolab_files_init();
	}
	else if (rcmail.task == 'files') {
	if (rcmail.gui_objects.filelist) {
	rcmail.file_list = new rcube_list_widget(rcmail.gui_objects.filelist, {
	multiselect: true,
	draggable: true,
	keyboard: true,
	column_movable: rcmail.env.col_movable,
	dblclick_time: rcmail.dblclick_time
	});
	/*
	rcmail.file_list.row_init = function(o){ kolab_files_init_file_row(o); };
	rcmail.file_list.addEventListener('dblclick', function(o){ p.msglist_dbl_click(o); });
	rcmail.file_list.addEventListener('click', function(o){ p.msglist_click(o); });
	rcmail.file_list.addEventListener('keypress', function(o){ p.msglist_keypress(o); });
	rcmail.file_list.addEventListener('dragstart', function(o){ p.drag_start(o); });
	rcmail.file_list.addEventListener('dragmove', function(e){ p.drag_move(e); });
	*/
	rcmail.file_list.addEventListener('dblclick', function(o) { kolab_files_list_dblclick(o); })
	.addEventListener('select', function(o) { kolab_files_list_select(o); })
	.addEventListener('keypress', function(o) { kolab_files_list_keypress(o); })
	.addEventListener('dragend', function(e) { kolab_files_drag_end(e); })
	.addEventListener('column_replace', function(e) { kolab_files_set_coltypes(e); })
	.addEventListener('listupdate', function(e) { rcmail.triggerEvent('listupdate', e); });

	rcmail.enable_command('menu-open', 'menu-save', 'files-sort', 'files-search', 'files-search-reset', 'folder-create', true);

	rcmail.file_list.init();
	kolab_files_list_coltypes();
	kolab_files_drag_drop_init($(rcmail.gui_objects.filelist).parents('.droptarget'));
	}

	// "one file only" commands
	rcmail.env.file_commands = ['files-get'];
	// "one or more file" commands
	rcmail.env.file_commands_all = ['files-delete', 'files-move', 'files-copy'];

	kolab_files_init();

	if (rcmail.env.action == 'open') {
	rcmail.enable_command('files-get', 'files-delete', rcmail.env.file);
	}
	else {
	file_api.folder_list();
	file_api.browser_capabilities_check();
	rcmail.enable_command('folder-mount', rcmail.env.external_sources);
	}
	}
	});


	/**********************************************************/
	/******* Shared functionality ********/
	/**********************************************************/

	// Initializes API object
	function kolab_files_init()
	{
	if (window.file_api)
	return;

	// Initialize application object (don't change var name!)
	file_api = $.extend(new files_api(), new kolab_files_ui());

	file_api.set_env({
	token: kolab_files_token(),
	url: rcmail.env.files_url,
	sort_col: 'name',
	sort_reverse: false,
	search_threads: rcmail.env.search_threads,
	resources_dir: 'program/resources',
	supported_mimetypes: rcmail.env.file_mimetypes
	});

	file_api.translations = rcmail.labels;
	};

	// returns API authorization token
	function kolab_files_token()
	{
	// consider the token from parent window more reliable (fresher) than in framed window
	// it's because keep-alive is not requested in frames
	return window.parent && parent.rcmail && parent.rcmail.env.files_token ? parent.rcmail.env.files_token : rcmail.env.files_token;
	};

	// folder selection dialog
	function kolab_directory_selector_dialog(id)
	{
	var dialog = $('#files-dialog'),
	input = $('#file-save-as-input'),
	form = $('#file-save-as'),
	list = $('#folderlistbox'),
	buttons = {}, label = 'saveto',
	win = window, fn;

	// attachment is specified
	if (id) {
	var attach = $('#attach' + id + '> a').first(),
	filename = attach.attr('title');

	if (!filename) {
	attach = attach.clone();
	$('.attachment-size', attach).remove();
	filename = attach.text();
	}

	form.show();
	dialog.addClass('saveas');
	input.val(filename);
	}
	// attachment preview page
	else if (rcmail.env.action == 'get') {
	id = rcmail.env.part;
	form.show();
	dialog.addClass('saveas');
	input.val(rcmail.env.filename);
	}
	else {
	form.hide();
	dialog.removeClass('saveas');
	label = 'saveall';
	}

	$('#foldercreatelink').attr('tabindex', 0);

	buttons[rcmail.gettext('kolab_files.save')] = function () {
	var lock = rcmail.set_busy(true, 'saving'),
	request = {
	act: 'save-file',
	source: rcmail.env.mailbox,
	uid: rcmail.env.uid,
	dest: file_api.env.folder
	};

	if (id) {
	request.id = id;
	request.name = input.val();
	}

	rcmail.http_post('plugin.kolab_files', request, lock);
	kolab_dialog_close(this);
	};

	buttons[rcmail.gettext('kolab_files.cancel')] = function () {
	kolab_dialog_close(this);
	};

	if (!rcmail.env.folders_loaded) {
	fn = function() {
	file_api.folder_list();
	rcmail.env.folders_loaded = true;
	};
	}

	// show dialog window
	kolab_dialog_show(dialog, {
	title: rcmail.gettext('kolab_files.' + label),
	buttons: buttons,
	minWidth: 250,
	minHeight: 300,
	height: 350,
	width: 300
	}, fn);

	// "enable" folder creation when dialog is displayed in parent window
	if (rcmail.is_framed() && !parent.rcmail.folder_create) {
	parent.rcmail.enable_command('folder-create', true);
	parent.rcmail.folder_create = function() {
	win.kolab_files_folder_create_dialog();
	};
	}
	};

	// file selection dialog
	function kolab_files_selector_dialog()
	{
	var dialog = $('#files-compose-dialog'), buttons = {};

	buttons[rcmail.gettext('kolab_files.attachsel')] = function () {
	var list = [];
	$('#filelist tr.selected').each(function() {
	list.push($(this).data('file'));
	});

	kolab_dialog_close(this);

	if (list.length) {
	// display upload indicator and cancel button
	var content = '<span>' + rcmail.get_label('kolab_files.attaching') + '</span>',
	id = new Date().getTime();

	rcmail.add2attachment_list(id, {name:'', html:content, classname:'uploading', complete:false});

	// send request
	rcmail.http_post('plugin.kolab_files', {
	act: 'attach-file',
	files: list,
	id: rcmail.env.compose_id,
	uploadid: id
	});
	}
	};

	buttons[rcmail.gettext('kolab_files.cancel')] = function () {
	kolab_dialog_close(this);
	};

	// show dialog window
	kolab_dialog_show(dialog, {
	title: rcmail.gettext('kolab_files.selectfiles'),
	buttons: buttons,
	minWidth: 500,
	minHeight: 300,
	width: 700,
	height: 500
	});

	if (!rcmail.env.files_loaded) {
	file_api.folder_list();
	rcmail.env.files_loaded = true;
	}
	else {
	rcmail.file_list.clear_selection();
	}
	};

	function kolab_files_attach_menu_open(p)
	{
	if (!p \|\| !p.props \|\| p.props.menu != 'attachmentmenu')
	return;

	var id = p.props.id;

	$('#attachmenusaveas').unbind('click').attr('onclick', '').click(function(e) {
	return kolab_directory_selector_dialog(id);
	});
	};

	// folder creation dialog
	function kolab_files_folder_create_dialog()
	{
	var dialog = $('#files-folder-create-dialog'),
	buttons = {},
	select = $('select[name="parent"]', dialog).html(''),
	input = $('input[name="name"]', dialog).val('');

	buttons[rcmail.gettext('kolab_files.create')] = function () {
	var folder = '', name = input.val(), parent = select.val();

	if (!name)
	return;

	if (parent)
	folder = parent + file_api.env.directory_separator;

	folder += name;

	file_api.folder_create(folder);
	kolab_dialog_close(this);
	};

	buttons[rcmail.gettext('kolab_files.cancel')] = function () {
	kolab_dialog_close(this);
	};

	// show dialog window
	kolab_dialog_show(dialog, {
	title: rcmail.gettext('kolab_files.foldercreate'),
	buttons: buttons
	});

	// Fix submitting form with Enter
	$('form', dialog).submit(kolab_dialog_submit_handler);

	// build parent selector
	select.append($('<option>').val('').text('---'));
	$.each(file_api.env.folders, function(i, f) {
	var n, option = $('<option>'), name = escapeHTML(f.name);

	for (n=0; n<f.depth; n++)
	name = '   ' + name;

	option.val(i).html(name).appendTo(select);

	if (i == file_api.env.folder)
	option.attr('selected', true);
	});
	};

	// folder edit dialog
	function kolab_files_folder_edit_dialog()
	{
	var dialog = $('#files-folder-edit-dialog'),
	buttons = {}, options = [],
	separator = file_api.env.directory_separator,
	arr = file_api.env.folder.split(separator),
	folder = arr.pop(),
	path = arr.join(separator),
	select = $('select[name="parent"]', dialog).html(''),
	input = $('input[name="name"]', dialog).val(folder);

	buttons[rcmail.gettext('kolab_files.save')] = function () {
	var folder = '', name = input.val(), parent = select.val();

	if (!name)
	return;

	if (parent)
	folder = parent + separator;

	folder += name;

	file_api.folder_rename(file_api.env.folder, folder);
	kolab_dialog_close(this);
	};

	buttons[rcmail.gettext('kolab_files.cancel')] = function () {
	kolab_dialog_close(this);
	};

	// show dialog window
	kolab_dialog_show(dialog, {
	title: rcmail.gettext('kolab_files.folderedit'),
	buttons: buttons
	});

	// Fix submitting form with Enter
	$('form', dialog).submit(kolab_dialog_submit_handler);

	// build parent selector
	options.push($('<option>').val('').text('---'));
	$.each(file_api.env.folders, function(i, f) {
	var n, name = escapeHTML(f.name);

	for (n=0; n<f.depth; n++)
	name = '   ' + name;

	options.push($('<option>').val(i).html(name));
	});

	select.append(options).val(path);
	};

	// folder mounting dialog
	function kolab_files_folder_mount_dialog()
	{
	var args = {buttons: {}, title: rcmail.gettext('kolab_files.foldermount')},
	dialog = $('#files-folder-mount-dialog'),
	input = $('#folder-mount-name').val('');

	args.buttons[rcmail.gettext('kolab_files.save')] = function () {
	var args = {}, folder = input.val(),
	driver = $('input[name="driver"]:checked', dialog).val();

	if (!folder \|\| !driver)
	return;

	args.folder = folder;
	args.driver = driver;

	$('#source-' + driver + ' input').each(function() {
	if (this.name.startsWith(driver + '[')) {
	args[this.name.substring(driver.length + 1, this.name.length - 1)] = this.value;
	}
	});

	$('.auth-options input', dialog).each(function() {
	args[this.name] = this.type == 'checkbox' && !this.checked ? '' : this.value;
	});

	file_api.folder_mount(args);
	kolab_dialog_close(this);
	};

	args.buttons[rcmail.gettext('kolab_files.cancel')] = function () {
	kolab_dialog_close(this);
	};

	// close folderoption menu
	rcmail.hide_menu('folderoptions');

	// initialize drivers list
	if (!rcmail.drivers_list_initialized) {
	rcmail.drivers_list_initialized = true;

	$('td.source', dialog).each(function() {
	$(this).click(function() {
	$('td.selected', dialog).removeClass('selected');
	dialog.find('.driverform').hide();
	$(this).addClass('selected').find('.driverform').show();
	$('input[type="radio"]', this).prop('checked', true);
	});
	});
	}

	// show dialog window
	kolab_dialog_show(dialog, args, function() {
	$('td.source:first', dialog).click();
	input.focus();
	});
	};

	// file edition dialog
	function kolab_files_file_edit_dialog(file)
	{
	var dialog = $('#files-file-edit-dialog'),
	buttons = {}, name = file_api.file_name(file)
	input = $('input[name="name"]', dialog).val(name);

	buttons[rcmail.gettext('kolab_files.save')] = function () {
	var folder = file_api.file_path(file), name = input.val();

	if (!name)
	return;

	name = folder + file_api.env.directory_separator + name;

	// @TODO: now we only update filename
	if (name != file)
	file_api.file_rename(file, name);
	kolab_dialog_close(this);
	};
	buttons[rcmail.gettext('kolab_files.cancel')] = function () {
	kolab_dialog_close(this);
	};

	// Fix submitting form with Enter
	$('form', dialog).submit(kolab_dialog_submit_handler);

	// show dialog window
	kolab_dialog_show(dialog, {
	title: rcmail.gettext('kolab_files.fileedit'),
	buttons: buttons
	});
	};

	function kolab_dialog_show(content, params, onopen)
	{
	params = $.extend({
	modal: true,
	resizable: true,
	closeOnEscape: (!bw.ie6 && !bw.ie7), // disabled for performance reasons
	minWidth: 400,
	minHeight: 300,
	width: 500,
	height: 400
	}, params \|\| {});

	// dialog close handler
	params.close = function(e, ui) {
	var elem, stack = rcmail.dialog_stack;

	content.appendTo(document.body).hide();
	$(this).parent().remove(); // remove dialog

	// focus previously focused element (guessed)
	stack.pop();
	if (stack.length) {
	elem = stack[stack.length-1].find('input[type!="hidden"]:not(:hidden):first');
	if (!elem.length)
	elem = stack[stack.length-1].parent().find('a[role="button"], .ui-dialog-buttonpane button').first();
	}

	(elem && elem.length ? elem : window).focus();
	};

	// display it as popup
	var dialog = rcmail.show_popup_dialog('', params.title, params.buttons, params);

	content.appendTo(dialog).show().find('input[type!="hidden"]:not(:hidden):first').focus();

	if (onopen) onopen(content);

	// save dialog reference, to handle focus when closing one of opened dialogs
	if (!rcmail.dialog_stack)
	rcmail.dialog_stack = [];

	rcmail.dialog_stack.push(dialog);
	};

	// Handle form submit with Enter key, click first dialog button instead
	function kolab_dialog_submit_handler()
	{
	$(this).parents('.ui-dialog').find('.ui-button').first().click();
	return false;
	};

	// Hides dialog
	function kolab_dialog_close(dialog)
	{
	(rcmail.is_framed() ? window.parent : window).$(dialog).dialog('close');
	};

	// smart upload button
	function kolab_files_upload_input(button)
	{
	var link = $(button),
	file = $('<input>'),
	offset = link.offset();

	function move_file_input(e) {
	file.css({top: (e.pageY - offset.top - 10) + 'px', left: (e.pageX - offset.left - 10) + 'px'});
	}

	file.attr({name: 'file[]', type: 'file', multiple: 'multiple', size: 5, title: link.attr('title'), tabindex: "-1"})
	.change(function() { rcmail.files_upload('#filesuploadform'); })
	.click(function() { setTimeout(function() { link.mouseleave(); }, 20); })
	// opacity:0 does the trick, display/visibility doesn't work
	.css({opacity: 0, cursor: 'pointer', outline: 'none', position: 'absolute'});

	// In FF and IE we need to move the browser file-input's button under the cursor
	// Thanks to the size attribute above we know the length of the input field
	if (bw.mz \|\| bw.ie)
	file.css({marginLeft: '-80px'});

	// Note: now, I observe problem with cursor style on FF < 4 only
	// Need position: relative (Bug #2615)
	link.css({overflow: 'hidden', cursor: 'pointer', position: 'relative'})
	.mouseenter(function() { this.__active = true; })
	// place button under the cursor
	.mousemove(function(e) {
	if (rcmail.commands['files-upload'] && this.__active)
	move_file_input(e);
	// move the input away if button is disabled
	else
	$(this).mouseleave();
	})
	.mouseleave(function() {
	file.css({top: '-10000px', left: '-10000px'});
	this.__active = false;
	})
	.attr('onclick', '') // remove default button action
	.click(function(e) {
	// forward click if mouse-enter event was missed
	if (rcmail.commands['files-upload'] && !this.__active) {
	this.__active = true;
	move_file_input(e);
	file.trigger(e);
	}
	})
	.mouseleave() // initially disable/hide input
	.append(file);
	};


	/***********************************************************/
	/******** Main functionality ********/
	/***********************************************************/

	// for reordering column array (Konqueror workaround)
	// and for setting some message list global variables
	kolab_files_list_coltypes = function()
	{
	var n, list = rcmail.file_list;

	rcmail.env.subject_col = null;

	if ((n = $.inArray('name', rcmail.env.coltypes)) >= 0) {
	rcmail.env.subject_col = n;
	list.subject_col = n;
	}

	list.init_header();
	};

	kolab_files_set_list_options = function(cols, sort_col, sort_order)
	{
	var update = 0, i, idx, name, newcols = [], oldcols = rcmail.env.coltypes;

	if (sort_col === undefined)
	sort_col = rcmail.env.sort_col;
	if (!sort_order)
	sort_order = rcmail.env.sort_order;

	if (rcmail.env.sort_col != sort_col \|\| rcmail.env.sort_order != sort_order) {
	update = 1;
	rcmail.set_list_sorting(sort_col, sort_order);
	}

	if (cols && cols.length) {
	// make sure new columns are added at the end of the list
	for (i=0; i<oldcols.length; i++) {
	name = oldcols[i];
	idx = $.inArray(name, cols);
	if (idx != -1) {
	newcols.push(name);
	delete cols[idx];
	}
	}
	for (i=0; i<cols.length; i++)
	if (cols[i])
	newcols.push(cols[i]);

	if (newcols.join() != oldcols.join()) {
	update += 2;
	oldcols = newcols;
	}
	}

	if (update == 1)
	rcmail.command('files-list', {sort: sort_col, reverse: sort_order == 'DESC'});
	else if (update) {
	rcmail.http_post('files/prefs', {
	kolab_files_list_cols: oldcols,
	kolab_files_sort_col: sort_col,
	kolab_files_sort_order: sort_order
	}, rcmail.set_busy(true, 'loading'));
	}
	};

	kolab_files_set_coltypes = function(list)
	{
	var i, found, name, cols = list.list.tHead.rows[0].cells;

	rcmail.env.coltypes = [];

	for (i=0; i<cols.length; i++)
	if (cols[i].id && cols[i].id.match(/^rcm/)) {
	name = cols[i].id.replace(/^rcm/, '');
	rcmail.env.coltypes.push(name);
	}

	// if ((found = $.inArray('name', rcmail.env.coltypes)) >= 0)
	// rcmail.env.subject_col = found;
	rcmail.env.subject_col = list.subject_col;

	rcmail.http_post('files/prefs', {kolab_files_list_cols: rcmail.env.coltypes});
	};

	kolab_files_list_dblclick = function(list)
	{
	rcmail.command('files-open');
	};

	kolab_files_list_select = function(list)
	{
	var selected = list.selection.length;

	rcmail.enable_command(rcmail.env.file_commands_all, selected);
	rcmail.enable_command(rcmail.env.file_commands, selected == 1);

	// reset all-pages-selection
	// if (list.selection.length && list.selection.length != list.rowcount)
	// rcmail.select_all_mode = false;

	// enable files-
	if (selected == 1) {
	// get file mimetype
	var type = $('tr.selected', list.list).data('type');
	rcmail.env.viewer = file_api.file_type_supported(type);
	}
	else
	rcmail.env.viewer = 0;
	/*
	) {
	// caps = this.browser_capabilities().join();
	href = '?' + $.param({_task: 'files', _action: 'open', file: file, viewer: viewer == 2 ? 1 : 0});
	var win = window.open(href, rcmail.html_identifier('rcubefile'+file));
	if (win)
	setTimeout(function() { win.focus(); }, 10);
	}
	*/
	rcmail.enable_command('files-open', rcmail.env.viewer);
	};

	kolab_files_list_keypress = function(list)
	{
	if (list.modkey == CONTROL_KEY)
	return;

	if (list.key_pressed == list.ENTER_KEY)
	rcmail.command('files-open');
	else if (list.key_pressed == list.DELETE_KEY \|\| list.key_pressed == list.BACKSPACE_KEY)
	rcmail.command('files-delete');
	};

	kolab_files_drag_end = function(e)
	{
	var folder = $('#files-folder-list li.droptarget').removeClass('droptarget');

	if (folder.length) {
	folder = folder.data('folder');

	var modkey = rcube_event.get_modifier(e),
	menu = rcmail.gui_objects.file_dragmenu;

	if (menu && modkey == SHIFT_KEY && rcmail.commands['files-copy']) {
	var pos = rcube_event.get_mouse_pos(e);
	rcmail.env.drag_target = folder;
	$(menu).css({top: (pos.y-10)+'px', left: (pos.x-10)+'px'}).show();
	return;
	}

	rcmail.command('files-move', folder);
	}
	};

	kolab_files_drag_menu_action = function(command)
	{
	var menu = rcmail.gui_objects.file_dragmenu;

	if (menu)
	$(menu).hide();

	rcmail.command(command, rcmail.env.drag_target);
	};

	kolab_files_selected = function()
	{
	var files = [];
	$.each(rcmail.file_list.get_selection(), function(i, v) {
	var name, row = $('#rcmrow'+v);

	if (row.length == 1 && (name = row.data('file')))
	files.push(name);
	});

	return files;
	};

	kolab_files_frame_load = function(frame)
	{
	var win = frame.contentWindow;

	rcmail.file_editor = win.file_editor && win.file_editor.editable ? win.file_editor : null;

	if (rcmail.file_editor)
	rcmail.enable_command('files-edit', true);

	rcmail.enable_command('files-print', (rcmail.file_editor && rcmail.file_editor.printable) \|\|
	(rcmail.env.file_data && /^image\//i.test(rcmail.env.file_data.type)));

	// detect Print button and check if it can be accessed
	try {
	if ($('#fileframe').contents().find('#print').length)
	rcmail.enable_command('files-print', true);
	}
	catch(e) {};
	};

	// activate html5 file drop feature (if browser supports it)
	kolab_files_drag_drop_init = function(container)
	{
	if (!window.FormData && !(window.XMLHttpRequest && XMLHttpRequest.prototype && XMLHttpRequest.prototype.sendAsBinary)) {
	return;
	}

	if (!container.length)
	return;

	$(document.body).bind('dragover dragleave drop', function(e) {
	if (!file_api.env.folder)
	return;

	e.preventDefault();
	container[e.type == 'dragover' ? 'addClass' : 'removeClass']('active');
	});

	container.bind('dragover dragleave', function(e) {
	return kolab_files_drag_hover(e);
	})
	container.children('div').bind('dragover dragleave', function(e) {
	return kolab_files_drag_hover(e);
	})
	container.get(0).addEventListener('drop', function(e) {
	// abort event and reset UI
	kolab_files_drag_hover(e);
	return file_api.file_drop(e);
	}, false);
	};

	// handler for drag/drop on element
	kolab_files_drag_hover = function(e)
	{
	if (!file_api.env.folder)
	return;

	e.preventDefault();
	e.stopPropagation();

	var elem = $(e.target);

	if (!elem.hasClass('droptarget'))
	elem = elem.parents('.droptarget');

	elem[e.type == 'dragover' ? 'addClass' : 'removeClass']('hover');
	};

	// returns localized file size
	kolab_files_file_size = function(size)
	{
	var i, units = ['GB', 'MB', 'KB', 'B'];

	size = file_api.file_size(size);

	for (i = 0; i < units.length; i++)
	if (size.toUpperCase().indexOf(units[i]) > 0)
	return size.replace(units[i], rcmail.gettext(units[i]));

	return size;
	};

	kolab_files_progress_str = function(param)
	{
	var current, total = file_api.file_size(param.total).toUpperCase();

	if (total.indexOf('GB') > 0)
	current = parseFloat(param.current/1073741824).toFixed(1);
	else if (total.indexOf('MB') > 0)
	current = parseFloat(param.current/1048576).toFixed(1);
	else if (total.indexOf('KB') > 0)
	current = parseInt(param.current/1024);
	else
	current = param.current;

	total = kolab_files_file_size(param.total);

	return rcmail.gettext('uploadprogress')
	.replace(/\$percent/, param.percent + '%')
	.replace(/\$current/, current)
	.replace(/\$total/, total);
	};


	/***********************************************************/
	/******** Commands ********/
	/***********************************************************/

	rcube_webmail.prototype.files_sort = function(props)
	{
	var params = {},
	sort_order = this.env.sort_order,
	sort_col = !this.env.disabled_sort_col ? props : this.env.sort_col;

	if (!this.env.disabled_sort_order)
	sort_order = this.env.sort_col == sort_col && sort_order == 'ASC' ? 'DESC' : 'ASC';

	// set table header and update env
	this.set_list_sorting(sort_col, sort_order);

	this.http_post('files/prefs', {kolab_files_sort_col: sort_col, kolab_files_sort_order: sort_order});

	params.sort = sort_col;
	params.reverse = sort_order == 'DESC';

	this.command('files-list', params);
	};

	rcube_webmail.prototype.files_search = function()
	{
	var value = $(this.gui_objects.filesearchbox).val();

	if (value)
	file_api.file_search(value, $('#search_all_folders').is(':checked'));
	else
	file_api.file_search_reset();
	};

	rcube_webmail.prototype.files_search_reset = function()
	{
	$(this.gui_objects.filesearchbox).val('');

	file_api.file_search_reset();
	};

	rcube_webmail.prototype.files_folder_delete = function()
	{
	if (confirm(this.get_label('kolab_files.folderdeleteconfirm')))
	file_api.folder_delete(file_api.env.folder);
	};

	rcube_webmail.prototype.files_delete = function()
	{
	if (!confirm(this.get_label('kolab_files.filedeleteconfirm')))
	return;

	var files = this.env.file ? [this.env.file] : kolab_files_selected();
	file_api.file_delete(files);
	};

	rcube_webmail.prototype.files_move = function(folder)
	{
	var files = kolab_files_selected();
	file_api.file_move(files, folder);
	};

	rcube_webmail.prototype.files_copy = function(folder)
	{
	var files = kolab_files_selected();
	file_api.file_copy(files, folder);
	};

	rcube_webmail.prototype.files_upload = function(form)
	{
	if (form)
	file_api.file_upload(form);
	};

	rcube_webmail.prototype.files_list = function(param)
	{
	// just rcmail wrapper, to handle command busy states
	file_api.file_list(param);
	}

	rcube_webmail.prototype.files_list_update = function(head)
	{
	var list = this.file_list;

	list.clear();
	$('thead', list.fixed_header ? list.fixed_header : list.list).html(head);
	kolab_files_list_coltypes();
	file_api.file_list();
	};

	rcube_webmail.prototype.files_get = function()
	{
	var files = this.env.file ? [this.env.file] : kolab_files_selected();

	if (files.length == 1)
	file_api.file_get(files[0], {'force-download': true});
	};

	rcube_webmail.prototype.files_open = function()
	{
	var files = kolab_files_selected();

	if (files.length == 1)
	file_api.file_open(files[0], rcmail.env.viewer);
	};

	// enable file editor
	rcube_webmail.prototype.files_edit = function()
	{
	if (this.file_editor) {
	this.file_editor.enable();
	this.enable_command('files-save', true);
	}
	};

	rcube_webmail.prototype.files_save = function()
	{
	if (!this.file_editor)
	return;

	// binary files like ODF need to be updated using FormData
	if (this.file_editor.getContentCallback) {
	if (!file_api.file_uploader_support())
	return;

	file_api.req = file_api.set_busy(true, 'saving');
	// this.file_editor.disable();
	this.file_editor.getContentCallback(function(content, filename) {
	file_api.file_uploader([content], {
	action: 'file_update',
	params: {file: rcmail.env.file, info: 1, token: file_api.env.token},
	response_handler: 'file_save_response',
	fieldname: 'content',
	single: true
	});
	});

	return;
	}

	var content = this.file_editor.getContent();

	file_api.file_save(this.env.file, content);
	};

	rcube_webmail.prototype.files_print = function()
	{
	if (this.file_editor && this.file_editor.printable)
	this.file_editor.print();
	else if (/^image\//i.test(this.env.file_data.type)) {
	var frame = $('#fileframe').get(0),
	win = frame ? frame.contentWindow : null;

	if (win) {
	win.focus();
	win.print();
	}
	}
	else {
	// e.g. Print button in PDF viewer
	try {
	$('#fileframe').contents().find('#print').click();
	}
	catch(e) {};
	}
	};

	rcube_webmail.prototype.files_set_quota = function(p)
	{
	if (p.total && window.file_api) {
	p.used *= 1024;
	p.total *= 1024;
	p.title = file_api.file_size(p.used) + ' / ' + file_api.file_size(p.total)
	+ ' (' + p.percent + '%)';
	}

	p.type = this.env.quota_type;

	this.set_quota(p);
	};

	rcube_webmail.prototype.folder_create = function()
	{
	kolab_files_folder_create_dialog();
	};

	rcube_webmail.prototype.folder_rename = function()
	{
	kolab_files_folder_edit_dialog();
	};

	rcube_webmail.prototype.folder_mount = function()
	{
	kolab_files_folder_mount_dialog();
	};


	/**********************************************************/
	/******* Files API handler ********/
	/**********************************************************/

	function kolab_files_ui()
	{
	this.requests = {};
	this.uploads = [];

	/*
	// Called on "session expired" session
	this.logout = function(response) {};

	// called when a request timed out
	this.request_timed_out = function() {};

	// called on start of the request
	this.set_request_time = function() {};

	// called on request response
	this.update_request_time = function() {};
	*/
	// set state
	this.set_busy = function(a, message)
	{
	if (this.req)
	rcmail.hide_message(this.req);

	return rcmail.set_busy(a, message);
	};

	// displays error message
	this.display_message = function(label, type)
	{
	return rcmail.display_message(this.t(label), type);
	};

	this.http_error = function(request, status, err)
	{
	rcmail.http_error(request, status, err);
	};

	// folders list request
	this.folder_list = function()
	{
	this.req = this.set_busy(true, 'loading');
	this.request('folder_list', {}, 'folder_list_response');
	};

	// folder list response handler
	this.folder_list_response = function(response)
	{
	if (!this.response(response))
	return;

	var first, elem = $('#files-folder-list'),
	list = $('<ul class="listing"></ul>'),
	collections = !rcmail.env.action.match(/^(preview\|show)$/) ? ['audio', 'video', 'image', 'document'] : [];

	// try parent window if the list element does not exist
	// i.e. called from dialog in parent window
	if (!elem.length && window.parent && parent.rcmail) {
	elem = $('#files-folder-list', window.parent.document.body);
	}

	elem.html('').append(list);

	this.env.folders = this.folder_list_parse(response.result && response.result.list ? response.result.list : response.result);

	$.each(this.env.folders, function(i, f) {
	list.append(file_api.folder_list_row(i, f));
	if (!first)
	first = i;
	});

	// add virtual collections
	$.each(collections, function(i, n) {
	var row = $('<li class="mailbox collection ' + n + '"></li>');

	row.attr({id: 'folder-collection-' + n, tabindex: 0})
	.append($('<span class="name"></span>').text(rcmail.gettext('kolab_files.collection_' + n)))
	.click(function() { file_api.folder_select(n, true); });

	list.append(row);
	});

	// select first folder?
	if (this.env.folder)
	this.folder_select(this.env.folder);
	else if (this.env.collection)
	this.folder_select(this.env.collection, true);
	else if (first)
	this.folder_select(first);

	// add tree icons
	this.folder_list_tree(this.env.folders);

	// handle authentication errors on external sources
	this.folder_list_auth_errors(response.result);
	};

	this.folder_select = function(folder, is_collection)
	{
	if (rcmail.busy)
	return;

	var list = $('#files-folder-list > ul');

	// try parent window if the list element does not exist
	// i.e. called from dialog in parent window
	if (!list.length && window.parent && parent.rcmail) {
	list = $('#files-folder-list > ul', window.parent.document.body);
	}

	$('li.selected', list).removeClass('selected');

	rcmail.enable_command('files-list', true);

	if (is_collection) {
	var found = $('#folder-collection-' + folder, list).addClass('selected');

	rcmail.enable_command('files-folder-delete', 'folder-rename', 'files-upload', false);
	this.env.folder = null;
	rcmail.command('files-list', {collection: folder});
	}
	else {
	var found = $('#' + this.env.folders[folder].id, list).addClass('selected');

	rcmail.enable_command('files-folder-delete', 'folder-rename', 'files-upload', true);
	this.env.folder = folder;
	this.env.collection = null;
	rcmail.command('files-list', {folder: folder});
	}

	this.quota();
	};

	this.folder_unselect = function()
	{
	var list = $('#files-folder-list > ul');
	$('li.selected', list).removeClass('selected');
	rcmail.enable_command('files-folder-delete', 'files-upload', false);
	this.env.folder = null;
	this.env.collection = null;
	};

	this.folder_list_row = function(i, folder)
	{
	var row = $('<li class="mailbox"><span class="branch"></span></li>');

	row.attr('id', folder.id).data('folder', i)
	.append($('<span class="name"></span>').text(folder.name));

	if (folder.depth) {
	$('span.branch', row).width(15 * folder.depth);
	row.addClass('child');
	}

	if (folder.virtual)
	row.addClass('virtual');
	else
	row.attr('tabindex', 0)
	.keypress(function(e) { if (e.which == 13 \|\| e.which == 32) file_api.folder_select(i); })
	.click(function() { file_api.folder_select(i); })
	.mouseenter(function() {
	if (rcmail.file_list && rcmail.file_list.drag_active && !$(this).hasClass('selected'))
	$(this).addClass('droptarget');
	})
	.mouseleave(function() {
	if (rcmail.file_list && rcmail.file_list.drag_active)
	$(this).removeClass('droptarget');
	});

	return row;
	};

	// folder create request
	this.folder_create = function(folder)
	{
	this.req = this.set_busy(true, 'kolab_files.foldercreating');
	this.request('folder_create', {folder: folder}, 'folder_create_response');
	};

	// folder create response handler
	this.folder_create_response = function(response)
	{
	if (!this.response(response))
	return;

	this.display_message('kolab_files.foldercreatenotice', 'confirmation');

	// refresh folders list
	this.folder_list();
	};

	// folder rename request
	this.folder_rename = function(folder, new_name)
	{
	if (folder == new_name)
	return;

	this.env.folder_rename = new_name;
	this.req = this.set_busy(true, 'kolab_files.folderupdating');
	this.request('folder_move', {folder: folder, 'new': new_name}, 'folder_rename_response');
	};

	// folder create response handler
	this.folder_rename_response = function(response)
	{
	if (!this.response(response))
	return;

	this.display_message('kolab_files.folderupdatenotice', 'confirmation');

	// refresh folders and files list
	this.env.folder = this.env.folder_rename;
	this.folder_list();
	};

	// folder mount (external storage) request
	this.folder_mount = function(data)
	{
	this.req = this.set_busy(true, 'kolab_files.foldermounting');
	this.request('folder_create', data, 'folder_mount_response');
	};

	// folder create response handler
	this.folder_mount_response = function(response)
	{
	if (!this.response(response))
	return;

	this.display_message('kolab_files.foldermountnotice', 'confirmation');

	// refresh folders list
	this.folder_list();
	};

	// folder delete request
	this.folder_delete = function(folder)
	{
	this.req = this.set_busy(true, 'kolab_files.folderdeleting');
	this.request('folder_delete', {folder: folder}, 'folder_delete_response');
	};

	// folder delete response handler
	this.folder_delete_response = function(response)
	{
	if (!this.response(response))
	return;

	this.env.folder = null;
	rcmail.enable_command('files-folder-delete', 'folder-rename', 'files-list', false);
	this.display_message('kolab_files.folderdeletenotice', 'confirmation');

	// refresh folders list
	this.folder_list();
	this.quota();
	};

	// quota request
	this.quota = function()
	{
	if (rcmail.env.files_quota)
	this.request('quota', {folder: this.env.folder}, 'quota_response');
	};

	// quota response handler
	this.quota_response = function(response)
	{
	if (!this.response(response))
	return;

	rcmail.files_set_quota(response.result);
	};

	this.file_list = function(params)
	{
	if (!rcmail.gui_objects.filelist)
	return;

	if (!params)
	params = {};

	// reset all pending list requests
	for (i in this.requests) {
	this.requests[i].abort();
	rcmail.hide_message(i);
	delete this.requests[i];
	}

	if (params.all_folders) {
	params.collection = null;
	params.folder = null;
	this.folder_unselect();
	}

	if (params.collection == undefined)
	params.collection = this.env.collection;
	if (params.folder == undefined)
	params.folder = this.env.folder;
	if (params.sort == undefined)
	params.sort = this.env.sort_col;
	if (params.reverse == undefined)
	params.reverse = this.env.sort_reverse;
	if (params.search == undefined)
	params.search = this.env.search;

	this.env.folder = params.folder;
	this.env.collection = params.collection;
	this.env.sort_col = params.sort;
	this.env.sort_reverse = params.reverse;

	rcmail.enable_command(rcmail.env.file_commands, false);
	rcmail.enable_command(rcmail.env.file_commands_all, false);

	// empty the list
	this.env.file_list = [];
	rcmail.file_list.clear(true);

	// request
	if (params.collection \|\| params.all_folders)
	this.file_list_loop(params);
	else if (this.env.folder) {
	params.req_id = this.set_busy(true, 'loading');
	this.requests[params.req_id] = this.request('file_list', params, 'file_list_response');
	}
	};

	// file list response handler
	this.file_list_response = function(response)
	{
	if (response.req_id)
	rcmail.hide_message(response.req_id);

	if (!this.response(response))
	return;

	var i = 0, list = [], table = $('#filelist');

	$.each(response.result, function(key, data) {
	var row = file_api.file_list_row(key, data, ++i);
	rcmail.file_list.insert_row(row);
	data.row = row;
	data.filename = key;
	list.push(data);
	});

	this.env.file_list = list;
	rcmail.file_list.resize();
	};

	// call file_list request for every folder (used for search and virt. collections)
	this.file_list_loop = function(params)
	{
	var i, folders = [], limit = Math.max(this.env.search_threads \|\| 1, 1);

	if (params.collection) {
	if (!params.search)
	params.search = {};
	params.search['class'] = params.collection;
	delete params['collection'];
	}

	delete params['all_folders'];

	$.each(this.env.folders, function(i, f) {
	if (!f.virtual)
	folders.push(i);
	});

	this.env.folders_loop = folders;
	this.env.folders_loop_params = params;
	this.env.folders_loop_lock = false;

	for (i=0; i<folders.length && i<limit; i++) {
	params.req_id = this.set_busy(true, 'loading');
	params.folder = folders.shift();
	this.requests[params.req_id] = this.request('file_list', params, 'file_list_loop_response');
	}
	};

	// file list response handler for loop'ed request
	this.file_list_loop_response = function(response)
	{
	var i, folders = this.env.folders_loop,
	params = this.env.folders_loop_params,
	limit = Math.max(this.env.search_threads \|\| 1, 1),
	valid = this.response(response);

	if (response.req_id)
	rcmail.hide_message(response.req_id);

	for (i=0; i<folders.length && i<limit; i++) {
	params.req_id = this.set_busy(true, 'loading');
	params.folder = folders.shift();
	this.requests[params.req_id] = this.request('file_list', params, 'file_list_loop_response');
	}

	rcmail.file_list.resize();

	if (!valid)
	return;

	this.file_list_loop_result_add(response.result);
	};

	// add files from list request to the table (with sorting)
	this.file_list_loop_result_add = function(result)
	{
	// chack if result (hash-array) is empty
	if (!object_is_empty(result))
	return;

	if (this.env.folders_loop_lock) {
	setTimeout(function() { file_api.file_list_loop_result_add(result); }, 100);
	return;
	}

	// lock table, other list responses will wait
	this.env.folders_loop_lock = true;

	var n, i, len, elem, list = [], rows = [],
	index = this.env.file_list.length,
	table = rcmail.file_list;

	for (n=0, len=index; n<len; n++) {
	elem = this.env.file_list[n];
	for (i in result) {
	if (this.sort_compare(elem, result[i]) < 0)
	break;

	var row = this.file_list_row(i, result[i], ++index);
	table.insert_row(row, elem.row);
	result[i].row = row;
	result[i].filename = i;
	list.push(result[i]);
	delete result[i];
	}

	list.push(elem);
	}

	// add the rest of rows
	$.each(result, function(key, data) {
	var row = file_api.file_list_row(key, data, ++index);
	table.insert_row(row);
	result[key].row = row;
	result[key].filename = key;
	list.push(result[key]);
	});

	this.env.file_list = list;
	this.env.folders_loop_lock = false;
	};

	// sort files list (without API request)
	this.file_list_sort = function(col, reverse)
	{
	var n, len, list = this.env.file_list,
	table = $('#filelist'), tbody = $('<tbody>');

	this.env.sort_col = col;
	this.env.sort_reverse = reverse;

	if (!list \|\| !list.length)
	return;

	// sort the list
	list.sort(function (a, b) {
	return file_api.sort_compare(a, b);
	});

	// add rows to the new body
	for (n=0, len=list.length; n<len; n++) {
	tbody.append(list[n].row);
	}

	// replace table bodies
	$('tbody', table).replaceWith(tbody);
	};

	this.file_list_row = function(file, data, index)
	{
	var c, col, row = '';

	for (c in rcmail.env.coltypes) {
	c = rcmail.env.coltypes[c];
	if (c == 'name')
	col = '<td class="name filename ' + this.file_type_class(data.type) + '">'
	+ '<span>' + escapeHTML(data.name) + '</span></td>';
	else if (c == 'mtime')
	col = '<td class="mtime">' + data.mtime + '</td>';
	else if (c == 'size')
	col = '<td class="size">' + this.file_size(data.size) + '</td>';
	else if (c == 'options')
	col = '<td class="options"><span></span></td>';
	else
	col = '<td class="' + c + '"></td>';

	row += col;
	}

	row = $('<tr>')
	.html(row)
	.attr({id: 'rcmrow' + index, 'data-file': file, 'data-type': data.type});

	$('td.options > span', row).click(function(e) {
	kolab_files_file_edit_dialog(file);
	});

	// collection (or search) lists files from all folders
	// display file name with full path as title
	if (!this.env.folder)
	$('td.name span', row).attr('title', file);

	return row.get(0);
	};

	this.file_search = function(value, all_folders)
	{
	if (value) {
	this.env.search = {name: value};
	rcmail.command('files-list', {search: this.env.search, all_folders: all_folders});
	}
	else
	this.search_reset();
	};

	this.file_search_reset = function()
	{
	if (this.env.search) {
	this.env.search = null;
	rcmail.command('files-list');
	}
	};

	this.file_get = function(file, params)
	{
	if (!params)
	params = {};

	params.token = this.env.token;
	params.file = file;

	rcmail.redirect(this.env.url + this.url('file_get', params));
	};

	// file(s) delete request
	this.file_delete = function(files)
	{
	this.req = this.set_busy(true, 'kolab_files.filedeleting');
	this.request('file_delete', {file: files}, 'file_delete_response');
	};

	// file(s) delete response handler
	this.file_delete_response = function(response)
	{
	if (!this.response(response))
	return;

	var rco, dir, self = this;

	this.display_message('kolab_files.filedeletenotice', 'confirmation');

	if (rcmail.env.file) {
	rco = rcmail.opener();
	dir = this.file_path(rcmail.env.file);

	// check if opener window contains files list, if not we can just close current window
	if (rco && rco.file_list && (opener.file_api.env.folder == dir \|\| !opener.file_api.env.folder))
	self = opener.file_api;
	else
	window.close();
	}

	// @TODO: consider list modification "in-place" instead of full reload
	self.file_list();
	self.quota();

	if (rcmail.env.file)
	window.close();
	};

	// file(s) move request
	this.file_move = function(files, folder)
	{
	if (!files \|\| !files.length \|\| !folder)
	return;

	var count = 0, list = {};

	$.each(files, function(i, v) {
	var name = folder + file_api.env.directory_separator + file_api.file_name(v);

	if (name != v) {
	list[v] = name;
	count++;
	}
	});

	if (!count)
	return;

	this.req = this.set_busy(true, 'kolab_files.filemoving');
	this.request('file_move', {file: list}, 'file_move_response');
	};

	// file(s) move response handler
	this.file_move_response = function(response)
	{
	if (!this.response(response))
	return;

	if (response.result && response.result.already_exist && response.result.already_exist.length)
	this.file_move_ask_user(response.result.already_exist, true);
	else {
	this.display_message('kolab_files.filemovenotice', 'confirmation');
	this.file_list();
	}
	};

	// file(s) copy request
	this.file_copy = function(files, folder)
	{
	if (!files \|\| !files.length \|\| !folder)
	return;

	var count = 0, list = {};

	$.each(files, function(i, v) {
	var name = folder + file_api.env.directory_separator + file_api.file_name(v);

	if (name != v) {
	list[v] = name;
	count++;
	}
	});

	if (!count)
	return;

	this.req = this.set_busy(true, 'kolab_files.filecopying');
	this.request('file_copy', {file: list}, 'file_copy_response');
	};

	// file(s) copy response handler
	this.file_copy_response = function(response)
	{
	if (!this.response(response))
	return;

	if (response.result && response.result.already_exist && response.result.already_exist.length)
	this.file_move_ask_user(response.result.already_exist);
	else {
	this.display_message('kolab_files.filecopynotice', 'confirmation');
	this.quota();
	}
	};

	// when file move/copy operation returns file-exists error
	// this displays a dialog where user can decide to skip
	// or overwrite destination file(s)
	this.file_move_ask_user = function(list, move)
	{
	var file = list[0], buttons = {},
	text = rcmail.gettext('kolab_files.filemoveconfirm').replace('$file', file.dst)
	dialog = $('<div></div>');

	buttons[rcmail.gettext('kolab_files.fileoverwrite')] = function() {
	var file = list.shift(), f = {},
	action = move ? 'file_move' : 'file_copy';

	f[file.src] = file.dst;
	file_api.file_move_ask_list = list;
	file_api.file_move_ask_mode = move;
	dialog.dialog('destroy').remove();
	file_api.req = file_api.set_busy(true, move ? 'kolab_files.filemoving' : 'kolab_files.filecopying');
	file_api.request(action, {file: f, overwrite: 1}, 'file_move_ask_user_response');
	};

	if (list.length > 1)
	buttons[rcmail.gettext('kolab_files.fileoverwriteall')] = function() {
	var f = {}, action = move ? 'file_move' : 'file_copy';

	$.each(list, function() { f[this.src] = this.dst; });
	dialog.dialog('destroy').remove();
	file_api.req = file_api.set_busy(true, move ? 'kolab_files.filemoving' : 'kolab_files.filecopying');
	file_api.request(action, {file: f, overwrite: 1}, action + '_response');
	};

	var skip_func = function() {
	list.shift();
	dialog.dialog('destroy').remove();

	if (list.length)
	file_api.file_move_ask_user(list, move);
	else if (move)
	file_api.file_list();
	};

	buttons[rcmail.gettext('kolab_files.fileskip')] = skip_func;

	if (list.length > 1)
	buttons[rcmail.gettext('kolab_files.fileskipall')] = function() {
	dialog.dialog('destroy').remove();
	if (move)
	file_api.file_list();
	};

	// open jquery UI dialog
	kolab_dialog_show(dialog.html(text), {
	close: skip_func,
	buttons: buttons,
	minWidth: 400,
	width: 400
	});
	};

	// file move (with overwrite) response handler
	this.file_move_ask_user_response = function(response)
	{
	var move = this.file_move_ask_mode, list = this.file_move_ask_list;

	this.response(response);

	if (list && list.length)
	this.file_move_ask_user(list, mode);
	else {
	this.display_message('kolab_files.file' + (move ? 'move' : 'copy') + 'notice', 'confirmation');
	if (move)
	this.file_list();
	}
	};

	// file(s) rename request
	this.file_rename = function(oldfile, newfile)
	{
	this.req = this.set_busy(true, 'kolab_files.fileupdating');
	this.request('file_move', {file: oldfile, 'new': newfile}, 'file_rename_response');
	};

	// file(s) move response handler
	this.file_rename_response = function(response)
	{
	if (!this.response(response))
	return;

	// @TODO: we could update metadata instead
	this.file_list();
	};

	// file upload request
	this.file_upload = function(form)
	{
	var form = $(form),
	field = $('input[type=file]', form).get(0),
	files = field.files ? field.files.length : field.value ? 1 : 0;

	if (!files \|\| !this.file_upload_size_check(field.files))
	return;

	// submit form and read server response
	this.file_upload_form(form, 'file_upload', function(event) {
	var doc, response;
	try {
	doc = this.contentDocument ? this.contentDocument : this.contentWindow.document;
	response = doc.body.innerHTML;
	// response may be wrapped in <pre> tag
	if (response.slice(0, 5).toLowerCase() == '<pre>' && response.slice(-6).toLowerCase() == '</pre>') {
	response = doc.body.firstChild.firstChild.nodeValue;
	}
	response = eval('(' + response + ')');
	}
	catch (err) {
	response = {status: 'ERROR'};
	}

	file_api.file_upload_progress_stop(event.data.ts);

	// refresh the list on upload success
	file_api.file_upload_response(response);
	});
	};

	// refresh the list on upload success
	this.file_upload_response = function(response)
	{
	if (this.response_parse(response)) {
	this.file_list();
	this.quota();
	}
	};

	// check upload max size
	this.file_upload_size_check = function(files)
	{
	var i, size = 0, maxsize = rcmail.env.files_max_upload;

	if (maxsize && files) {
	for (i=0; i < files.length; i++)
	size += files[i].size \|\| files[i].fileSize;

	if (size > maxsize) {
	alert(rcmail.get_label('kolab_files.uploadsizeerror').replace('$size', kolab_files_file_size(maxsize)));
	return false;
	}
	}

	return true;
	};

	// post the given form to a hidden iframe
	this.file_upload_form = function(form, action, onload)
	{
	var ts = new Date().getTime(),
	frame_name = 'fileupload' + ts;

	// upload progress support
	if (rcmail.env.files_progress_name) {
	var fname = rcmail.env.files_progress_name,
	field = $('input[name='+fname+']', form);

	if (!field.length) {
	field = $('<input>').attr({type: 'hidden', name: fname});
	field.prependTo(form);
	}

	field.val(ts);
	this.file_upload_progress(ts, true);
	}

	rcmail.display_progress({name: ts});

	// have to do it this way for IE
	// otherwise the form will be posted to a new window
	if (document.all) {
	var html = '<iframe id="'+frame_name+'" name="'+frame_name+'"'
	+ ' src="program/resources/blank.gif" style="width:0;height:0;visibility:hidden;"></iframe>';
	document.body.insertAdjacentHTML('BeforeEnd', html);
	}
	// for standards-compliant browsers
	else
	$('<iframe>')
	.attr({name: frame_name, id: frame_name})
	.css({border: 'none', width: 0, height: 0, visibility: 'hidden'})
	.appendTo(document.body);

	// handle upload errors, parsing iframe content in onload
	$('#'+frame_name).on('load', {ts:ts}, onload);

	$(form).attr({
	target: frame_name,
	action: this.env.url + this.url(action, {folder: this.env.folder, token: this.env.token}),
	method: 'POST'
	}).attr(form.encoding ? 'encoding' : 'enctype', 'multipart/form-data')
	.submit();
	};

	// handler when files are dropped to a designated area.
	// compose a multipart form data and submit it to the server
	this.file_drop = function(e)
	{
	var files = e.target.files \|\| e.dataTransfer.files;

	if (!files \|\| !files.length \|\| !this.file_upload_size_check(files))
	return;

	// prepare multipart form data composition
	var ts = new Date().getTime(),
	formdata = window.FormData ? new FormData() : null,
	fieldname = 'file[]',
	boundary = '------multipartformboundary' + (new Date).getTime(),
	dashdash = '--', crlf = '\r\n',
	multipart = dashdash + boundary + crlf;

	// inline function to submit the files to the server
	var submit_data = function() {
	var multiple = files.length > 1;

	rcmail.display_progress({name: ts});
	if (rcmail.env.files_progress_name)
	file_api.file_upload_progress(ts, true);

	// complete multipart content and post request
	multipart += dashdash + boundary + dashdash + crlf;

	$.ajax({
	type: 'POST',
	dataType: 'json',
	url: file_api.env.url + file_api.url('file_upload', {folder: file_api.env.folder}),
	contentType: formdata ? false : 'multipart/form-data; boundary=' + boundary,
	processData: false,
	timeout: 0, // disable default timeout set in ajaxSetup()
	data: formdata \|\| multipart,
	headers: {'X-Session-Token': file_api.env.token},
	success: function(data) {
	file_api.file_upload_progress_stop(ts);
	file_api.file_upload_response(data);
	},
	error: function(o, status, err) {
	file_api.file_upload_progress_stop(ts);
	rcmail.http_error(o, status, err);
	},
	xhr: function() {
	var xhr = jQuery.ajaxSettings.xhr();
	if (!formdata && xhr.sendAsBinary)
	xhr.send = xhr.sendAsBinary;
	return xhr;
	}
	});
	};

	// upload progress supported (and handler exists)
	// add progress ID to the request - need to be added before files
	if (rcmail.env.files_progress_name) {
	if (formdata)
	formdata.append(rcmail.env.files_progress_name, ts);
	else
	multipart += 'Content-Disposition: form-data; name="' + rcmail.env.files_progress_name + '"'
	+ crlf + crlf + ts + crlf + dashdash + boundary + crlf;
	}

	// get contents of all dropped files
	var f, j, i = 0, last = files.length - 1;
	for (j = 0; j <= last && (f = files[i]); i++) {
	if (!f.name) f.name = f.fileName;
	if (!f.size) f.size = f.fileSize;
	if (!f.type) f.type = 'application/octet-stream';

	// file name contains non-ASCII characters, do UTF8-binary string conversion.
	if (!formdata && /[^\x20-\x7E]/.test(f.name))
	f.name_bin = unescape(encodeURIComponent(f.name));

	// do it the easy way with FormData (FF 4+, Chrome 5+, Safari 5+)
	if (formdata) {
	formdata.append(fieldname, f);
	if (j == last)
	return submit_data();
	}
	// use FileReader supporetd by Firefox 3.6
	else if (window.FileReader) {
	var reader = new FileReader();

	// closure to pass file properties to async callback function
	reader.onload = (function(file, j) {
	return function(e) {
	multipart += 'Content-Disposition: form-data; name="' + fieldname + '"';
	multipart += '; filename="' + (f.name_bin \|\| file.name) + '"' + crlf;
	multipart += 'Content-Length: ' + file.size + crlf;
	multipart += 'Content-Type: ' + file.type + crlf + crlf;
	multipart += reader.result + crlf;
	multipart += dashdash + boundary + crlf;

	if (j == last) // we're done, submit the data
	return submit_data();
	}
	})(f,j);
	reader.readAsBinaryString(f);
	}

	j++;
	}
	};

	// upload progress requests
	this.file_upload_progress = function(id, init)
	{
	if (init && id)
	this.uploads[id] = this.env.folder;

	setTimeout(function() {
	if (id && file_api.uploads[id])
	file_api.request('upload_progress', {id: id}, 'file_upload_progress_response');
	}, rcmail.env.files_progress_time * 1000);
	};

	// upload progress response
	this.file_upload_progress_response = function(response)
	{
	if (!this.response(response))
	return;

	var param = response.result;

	if (!param.id \|\| !this.uploads[param.id])
	return;

	if (param.total) {
	param.name = param.id;

	if (!param.done)
	param.text = kolab_files_progress_str(param);

	rcmail.display_progress(param);
	}

	if (!param.done && param.total)
	this.file_upload_progress(param.id);
	+ else
	+ delete this.uploads[param.id];
	};

	this.file_upload_progress_stop = function(id)
	{
	if (id && this.uploads[id]) {
	delete this.uploads[id];
	rcmail.display_progress({name: id});
	}
	};

	// open file in new window, using file API viewer
	this.file_open = function(file, viewer)
	{
	var href = '?' + $.param({_task: 'files', _action: 'open', file: file, viewer: viewer == 2 ? 1 : 0});
	rcmail.open_window(href, false, true);
	};

	// save file
	this.file_save = function(file, content)
	{
	rcmail.enable_command('files-save', false);
	// because we currently can edit only text files
	// and we do not expect them to be very big, we save
	// file in a very simple way, no upload progress, etc.
	this.req = this.set_busy(true, 'saving');
	this.request('file_update', {file: file, content: content, info: 1}, 'file_save_response');
	};

	// file save response handler
	this.file_save_response = function(response)
	{
	rcmail.enable_command('files-save', true);

	if (!this.response(response))
	return;

	// update file properties table
	var table = $('#fileinfobox table'), file = response.result;

	if (file) {
	$('td.filetype', table).text(file.type);
	$('td.filesize', table).text(this.file_size(file.size));
	$('td.filemtime', table).text(file.mtime);
	}
	};

	// handle auth errors on folder list
	this.folder_list_auth_errors = function(result)
	{
	if (result && result.auth_errors) {
	if (!this.auth_errors)
	this.auth_errors = {};

	$.extend(this.auth_errors, result.auth_errors);
	}

	// ask for password to the first storage on the list
	$.each(this.auth_errors \|\| [], function(i, v) {
	file_api.folder_list_auth_dialog(i, v);
	return false;
	});
	};

	// create dialog for user credentials of external storage
	this.folder_list_auth_dialog = function(label, driver)
	{
	var args = {width: 400, height: 300, buttons: {}},
	dialog = $('#files-folder-auth-dialog'),
	content = this.folder_list_auth_form(driver);

	dialog.find('table.propform').remove();
	$('.auth-options', dialog).before(content);

	args.buttons[this.t('kolab_files.save')] = function() {
	var data = {folder: label, list: 1};

	$('input', dialog).each(function() {
	data[this.name] = this.type == 'checkbox' && !this.checked ? '' : this.value;
	});

	file_api.open_dialog = this;
	file_api.req = file_api.set_busy(true, 'kolab_files.authenticating');
	file_api.request('folder_auth', data, 'folder_auth_response');
	};

	args.buttons[this.t('kolab_files.cancel')] = function() {
	delete file_api.auth_errors[label];
	kolab_dialog_close(this);
	// go to the next one
	file_api.folder_list_auth_errors();
	};

	args.title = this.t('kolab_files.folderauthtitle').replace('$title', label);

	// show dialog window
	kolab_dialog_show(dialog, args, function() {
	// focus first empty input
	$('input', dialog).each(function() {
	if (!this.value) {
	this.focus();
	return false;
	}
	});
	});
	};

	// folder_auth handler
	this.folder_auth_response = function(response)
	{
	if (!this.response(response))
	return;

	var cnt = 0, folders,
	folder = response.result.folder,
	parent = $('#' + this.env.folders[folder].id);

	// try parent window if the folder element does not exist
	if (!parent.length && window.parent && window.parent.rcmail) {
	parent = $('#' + this.env.folders[folder].id, window.parent.document.body);
	}

	delete this.auth_errors[folder];
	kolab_dialog_close(this.open_dialog);

	// go to the next one
	this.folder_list_auth_errors();

	// count folders on the list
	$.each(this.env.folders, function() { cnt++; });

	// parse result
	folders = this.folder_list_parse(response.result.list, cnt);
	delete folders[folder]; // remove root added in folder_list_parse()

	// add folders from the external source to the list
	$.each(folders, function(i, f) {
	var row = file_api.folder_list_row(i, f);
	parent.after(row);
	parent = row;
	});

	// add tree icons
	this.folder_list_tree(folders);

	$.extend(this.env.folders, folders);
	};

	// returns content of the external storage authentication form
	this.folder_list_auth_form = function(driver)
	{
	var rows = [];

	$.each(driver.form, function(fi, fv) {
	var id = 'authinput' + fi,
	attrs = {type: fi.match(/pass/) ? 'password' : 'text', size: 25, name: fi, id: id},
	input = $('<input>').attr(attrs);

	if (driver.form_values && driver.form_values[fi])
	input.attr({value: driver.form_values[fi]});

	rows.push($('<tr>')
	.append($('<td class="title">').append($('<label>').attr('for', id).text(fv)))
	.append($('<td>').append(input))
	);
	});

	return $('<table class="propform">').append(rows);
	};
	};

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