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	diff --git a/plugins/kolab_files/lib/kolab_files_engine.php b/plugins/kolab_files/lib/kolab_files_engine.php
	index cf920f12..4ea58ba1 100644
	--- a/plugins/kolab_files/lib/kolab_files_engine.php
	+++ b/plugins/kolab_files/lib/kolab_files_engine.php
	@@ -1,1552 +1,1552 @@
	<?php

	/**
	* Kolab files storage engine
	*
	* @version @package_version@
	* @author Aleksander Machniak <machniak@kolabsys.com>
	*
	* Copyright (C) 2013-2015, 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/>.
	*/

	class kolab_files_engine
	{
	private $plugin;
	private $rc;
	private $url;
	private $url_srv;
	private $timeout = 600;
	private $files_sort_cols = array('name', 'mtime', 'size');
	private $sessions_sort_cols = array('name');

	const API_VERSION = 2;


	/**
	* Class constructor
	*/
	public function __construct($plugin, $client_url, $server_url = null)
	{
	- $this->url = rcube_utils::resolve_url($client_url);
	- $this->url_srv = $server_url ? rcube_utils::resolve_url($server_url) : $this->url;
	+ $this->url = rtrim(rcube_utils::resolve_url($client_url), '/ ');
	+ $this->url_srv = $server_url ? rtrim(rcube_utils::resolve_url($server_url), '/ ') : $this->url;
	$this->plugin = $plugin;
	$this->rc = $plugin->rc;
	$this->timeout = $this->rc->config->get('session_lifetime') * 60;
	}

	/**
	* User interface initialization
	*/
	public function ui()
	{
	$this->plugin->add_texts('localization/');

	$templates = array();

	// set templates of Files UI and widgets
	if ($this->rc->task == 'mail') {
	if (in_array($this->rc->action, array('', 'show', 'compose'))) {
	$templates[] = 'compose_plugin';
	}
	if (in_array($this->rc->action, array('show', 'preview', 'get'))) {
	$templates[] = 'message_plugin';

	if ($this->rc->action == 'get') {
	// add "Save as" button into attachment toolbar
	$this->plugin->add_button(array(
	'id' => 'saveas',
	'name' => 'saveas',
	'type' => 'link',
	'onclick' => 'kolab_directory_selector_dialog()',
	'class' => 'button buttonPas saveas',
	'classact' => 'button saveas',
	'label' => 'kolab_files.save',
	'title' => 'kolab_files.saveto',
	), 'toolbar');
	}
	else {
	// add "Save as" button into attachment menu
	$this->plugin->add_button(array(
	'id' => 'attachmenusaveas',
	'name' => 'attachmenusaveas',
	'type' => 'link',
	'wrapper' => 'li',
	'onclick' => 'return false',
	'class' => 'icon active saveas',
	'classact' => 'icon active saveas',
	'innerclass' => 'icon active saveas',
	'label' => 'kolab_files.saveto',
	), 'attachmentmenu');
	}
	}

	$list_widget = true;
	}
	else if (!$this->rc->action && in_array($this->rc->task, array('calendar', 'tasks'))) {
	$list_widget = true;
	$templates[] = 'compose_plugin';
	}
	else if ($this->rc->task == 'files') {
	$templates[] = 'files';

	// get list of external sources
	$this->get_external_storage_drivers();

	// these labels may be needed even if fetching ext sources failed
	$this->plugin->add_label('folderauthtitle', 'authenticating');
	}

	if ($list_widget) {
	$this->folder_list_env();

	$this->plugin->add_label('save', 'cancel', 'saveto',
	'saveall', 'fromcloud', 'attachsel', 'selectfiles', 'attaching',
	'collection_audio', 'collection_video', 'collection_image', 'collection_document',
	'folderauthtitle', 'authenticating'
	);
	}

	// add taskbar button
	if (empty($_REQUEST['framed'])) {
	$this->plugin->add_button(array(
	'command' => 'files',
	'class' => 'button-files',
	'classsel' => 'button-files button-selected',
	'innerclass' => 'button-inner',
	'label' => 'kolab_files.files',
	), 'taskbar');
	}

	if ($_SESSION['kolab_files_caps']['MANTICORE'] \|\| $_SESSION['kolab_files_caps']['WOPI']) {
	$_SESSION['kolab_files_caps']['DOCEDIT'] = true;
	$_SESSION['kolab_files_caps']['DOCTYPE'] = $_SESSION['kolab_files_caps']['MANTICORE'] ? 'manticore' : 'wopi';
	}

	$this->plugin->include_stylesheet($this->plugin->local_skin_path().'/style.css');
	$this->plugin->include_script($this->url . '/js/files_api.js');
	$this->plugin->include_script('kolab_files.js');

	$this->rc->output->set_env('files_url', $this->url . '/api/');
	$this->rc->output->set_env('files_token', $this->get_api_token());
	$this->rc->output->set_env('files_caps', $_SESSION['kolab_files_caps']);
	$this->rc->output->set_env('files_user', $this->rc->get_user_name());

	if ($_SESSION['kolab_files_caps']['DOCEDIT']) {
	$this->plugin->add_label('declinednotice', 'invitednotice', 'acceptedownernotice',
	'declinedownernotice', 'requestednotice', 'acceptednotice', 'declinednotice',
	'more', 'accept', 'decline', 'join', 'status', 'when', 'file', 'comment',
	'statusaccepted', 'statusinvited', 'statusdeclined', 'statusrequested',
	'invitationaccepting', 'invitationdeclining', 'invitationrequesting',
	'close', 'invitationtitle', 'sessions');
	}

	if (!empty($templates)) {
	$collapsed_folders = (string) $this->rc->config->get('kolab_files_collapsed_folders');

	$this->rc->output->include_script('treelist.js');
	$this->rc->output->set_env('kolab_files_collapsed_folders', $collapsed_folders);

	// register template objects for dialogs (and main interface)
	$this->rc->output->add_handlers(array(
	'folder-create-form' => array($this, 'folder_create_form'),
	'folder-edit-form' => array($this, 'folder_edit_form'),
	'folder-mount-form' => array($this, 'folder_mount_form'),
	'folder-auth-options'=> array($this, 'folder_auth_options'),
	'file-search-form' => array($this, 'file_search_form'),
	'file-rename-form' => array($this, 'file_rename_form'),
	'file-create-form' => array($this, 'file_create_form'),
	'file-edit-dialog' => array($this, 'file_edit_dialog'),
	'file-session-dialog' => array($this, 'file_session_dialog'),
	'filelist' => array($this, 'file_list'),
	'sessionslist' => array($this, 'sessions_list'),
	'filequotadisplay' => array($this, 'quota_display'),
	'document-editors-dialog' => array($this, 'document_editors_dialog'),
	));

	if ($this->rc->task != 'files') {
	// add dialog(s) content at the end of page body
	foreach ($templates as $template) {
	$this->rc->output->add_footer(
	$this->rc->output->parse('kolab_files.' . $template, false, false));
	}
	}
	}
	}

	/**
	* Engine actions handler
	*/
	public function actions()
	{
	if ($this->rc->task == 'files' && $this->rc->action) {
	$action = $this->rc->action;
	}
	else if ($this->rc->task != 'files' && $_POST['act']) {
	$action = $_POST['act'];
	}
	else {
	$action = 'index';
	}

	$method = 'action_' . str_replace('-', '_', $action);

	if (method_exists($this, $method)) {
	$this->plugin->add_texts('localization/');
	$this->{$method}();
	}
	}

	/**
	* Template object for folder creation form
	*/
	public function folder_create_form($attrib)
	{
	$attrib['name'] = 'folder-create-form';
	if (empty($attrib['id'])) {
	$attrib['id'] = 'folder-create-form';
	}

	$input_name = new html_inputfield(array('id' => 'folder-name', 'name' => 'name', 'size' => 30));
	$select_parent = new html_select(array('id' => 'folder-parent', 'name' => 'parent'));
	$table = new html_table(array('cols' => 2, 'class' => 'propform'));

	$table->add('title', html::label('folder-name', rcube::Q($this->plugin->gettext('foldername'))));
	$table->add(null, $input_name->show());
	$table->add('title', html::label('folder-parent', rcube::Q($this->plugin->gettext('folderinside'))));
	$table->add(null, $select_parent->show());

	$out = $table->show();

	// add form tag around text field
	if (empty($attrib['form'])) {
	$out = $this->rc->output->form_tag($attrib, $out);
	}

	$this->plugin->add_label('foldercreating', 'foldercreatenotice', 'create', 'foldercreate', 'cancel');
	$this->rc->output->add_gui_object('folder-create-form', $attrib['id']);

	return $out;
	}

	/**
	* Template object for folder editing form
	*/
	public function folder_edit_form($attrib)
	{
	$attrib['name'] = 'folder-edit-form';
	if (empty($attrib['id'])) {
	$attrib['id'] = 'folder-edit-form';
	}

	$input_name = new html_inputfield(array('id' => 'folder-edit-name', 'name' => 'name', 'size' => 30));
	$select_parent = new html_select(array('id' => 'folder-edit-parent', 'name' => 'parent'));
	$table = new html_table(array('cols' => 2, 'class' => 'propform'));

	$table->add('title', html::label('folder-name', rcube::Q($this->plugin->gettext('foldername'))));
	$table->add(null, $input_name->show());
	$table->add('title', html::label('folder-parent', rcube::Q($this->plugin->gettext('folderinside'))));
	$table->add(null, $select_parent->show());

	$out = $table->show();

	// add form tag around text field
	if (empty($attrib['form'])) {
	$out = $this->rc->output->form_tag($attrib, $out);
	}

	$this->plugin->add_label('folderupdating', 'folderupdatenotice', 'save', 'folderedit', 'cancel');
	$this->rc->output->add_gui_object('folder-edit-form', $attrib['id']);

	return $out;
	}

	/**
	* Template object for folder mounting form
	*/
	public function folder_mount_form($attrib)
	{
	$sources = $this->rc->output->get_env('external_sources');

	if (empty($sources) \|\| !is_array($sources)) {
	return '';
	}

	$attrib['name'] = 'folder-mount-form';
	if (empty($attrib['id'])) {
	$attrib['id'] = 'folder-mount-form';
	}

	// build form content
	$table = new html_table(array('cols' => 2, 'class' => 'propform'));
	$input_name = new html_inputfield(array('id' => 'folder-mount-name', 'name' => 'name', 'size' => 30));
	$input_driver = new html_radiobutton(array('name' => 'driver', 'size' => 30));

	$table->add('title', html::label('folder-mount-name', rcube::Q($this->plugin->gettext('name'))));
	$table->add(null, $input_name->show());

	foreach ($sources as $key => $source) {
	$id = 'source-' . $key;
	$form = new html_table(array('cols' => 2, 'class' => 'propform driverform'));

	foreach ((array) $source['form'] as $idx => $label) {
	$iid = $id . '-' . $idx;
	$type = stripos($idx, 'pass') !== false ? 'html_passwordfield' : 'html_inputfield';
	$input = new $type(array('size' => 30));

	$form->add('title', html::label($iid, rcube::Q($label)));
	$form->add(null, $input->show('', array(
	'id' => $iid,
	'name' => $key . '[' . $idx . ']'
	)));
	}

	$row = $input_driver->show(null, array('value' => $key))
	. html::img(array('src' => $source['image'], 'alt' => $key, 'title' => $source['name']))
	. html::div(null, html::span('name', rcube::Q($source['name']))
	. html::br()
	. html::span('description', rcube::Q($source['description']))
	. $form->show()
	);

	$table->add(array('id' => $id, 'colspan' => 2, 'class' => 'source'), $row);
	}

	$out = $table->show() . $this->folder_auth_options(array('suffix' => '-form'));

	// add form tag around text field
	if (empty($attrib['form'])) {
	$out = $this->rc->output->form_tag($attrib, $out);
	}

	$this->plugin->add_label('foldermounting', 'foldermountnotice', 'foldermount',
	'save', 'cancel', 'folderauthtitle', 'authenticating'
	);
	$this->rc->output->add_gui_object('folder-mount-form', $attrib['id']);

	return $out;
	}

	/**
	* Template object for folder authentication options
	*/
	public function folder_auth_options($attrib)
	{
	$checkbox = new html_checkbox(array(
	'name' => 'store_passwords',
	'value' => '1',
	'id' => 'auth-pass-checkbox' . $attrib['suffix'],
	));

	return html::div('auth-options', $checkbox->show(). ' '
	. html::label('auth-pass-checkbox' . $attrib['suffix'], $this->plugin->gettext('storepasswords'))
	. html::span('description', $this->plugin->gettext('storepasswordsdesc'))
	);
	}

	/**
	* Template object for file edit dialog/warnings
	*/
	public function file_edit_dialog($attrib)
	{
	$this->plugin->add_label('select', 'create', 'cancel', 'editfiledialog', 'editfilesessions',
	'newsession', 'ownedsession', 'invitedsession', 'joinsession', 'editfilero', 'editfilerotitle',
	'newsessionro'
	);

	return '<div></div>';
	}

	/**
	* Template object for file session dialog
	*/
	public function file_session_dialog($attrib)
	{
	$this->plugin->add_label('join', 'open', 'close', 'request', 'cancel',
	'sessiondialog', 'sessiondialogcontent');

	return '<div></div>';
	}

	/**
	* Template object for dcument editors dialog
	*/
	public function document_editors_dialog($attrib)
	{
	$table = new html_table(array('cols' => 3, 'border' => 0, 'cellpadding' => 0, 'class' => 'records-table'));

	$table->add_header('username', $this->plugin->gettext('participant'));
	$table->add_header('status', $this->plugin->gettext('status'));
	$table->add_header('options', null);

	$input = new html_inputfield(array('name' => 'participant', 'id' => 'invitation-editor-name', 'size' => 30));
	$textarea = new html_textarea(array('name' => 'comment', 'id' => 'invitation-comment',
	'rows' => 4, 'cols' => 55, 'title' => $this->plugin->gettext('invitationtexttitle')));
	$button = new html_inputfield(array('type' => 'button', 'class' => 'button', 'id' => 'invitation-editor-add', 'value' => $this->plugin->gettext('addparticipant')));

	$this->plugin->add_label('manageeditors', 'statusorganizer');

	// initialize attendees autocompletion
	$this->rc->autocomplete_init();

	return '<div>' . $table->show() . html::div(null,
	html::div(null, $input->show() . " " . $button->show())
	. html::p('attendees-commentbox', html::label(null,
	$this->plugin->gettext('invitationtextlabel') . $textarea->show())
	)
	) . '</div>';
	}

	/**
	* Template object for file_rename form
	*/
	public function file_rename_form($attrib)
	{
	$attrib['name'] = 'file-rename-form';
	if (empty($attrib['id'])) {
	$attrib['id'] = 'file-rename-form';
	}

	$input_name = new html_inputfield(array('id' => 'file-rename-name', 'name' => 'name', 'size' => 50));
	$table = new html_table(array('cols' => 2, 'class' => 'propform'));

	$table->add('title', html::label('file-rename-name', rcube::Q($this->plugin->gettext('filename'))));
	$table->add(null, $input_name->show());

	$out = $table->show();

	// add form tag around text field
	if (empty($attrib['form'])) {
	$out = $this->rc->output->form_tag($attrib, $out);
	}

	$this->plugin->add_label('save', 'cancel', 'fileupdating', 'renamefile');
	$this->rc->output->add_gui_object('file-rename-form', $attrib['id']);

	return $out;
	}

	/**
	* Template object for file_create form
	*/
	public function file_create_form($attrib)
	{
	$attrib['name'] = 'file-create-form';
	if (empty($attrib['id'])) {
	$attrib['id'] = 'file-create-form';
	}

	$input_name = new html_inputfield(array('id' => 'file-create-name', 'name' => 'name', 'size' => 30));
	$select_parent = new html_select(array('id' => 'file-create-parent', 'name' => 'parent'));
	$select_type = new html_select(array('id' => 'file-create-type', 'name' => 'type'));
	$table = new html_table(array('cols' => 2, 'class' => 'propform'));

	$types = array();

	foreach ($this->get_mimetypes('edit') as $type => $mimetype) {
	$types[$type] = $mimetype['ext'];
	$select_type->add($mimetype['label'], $type);
	}

	$table->add('title', html::label('file-create-name', rcube::Q($this->plugin->gettext('filename'))));
	$table->add(null, $input_name->show());
	$table->add('title', html::label('file-create-type', rcube::Q($this->plugin->gettext('type'))));
	$table->add(null, $select_type->show());
	$table->add('title', html::label('folder-parent', rcube::Q($this->plugin->gettext('folderinside'))));
	$table->add(null, $select_parent->show());

	$out = $table->show();

	// add form tag around text field
	if (empty($attrib['form'])) {
	$out = $this->rc->output->form_tag($attrib, $out);
	}

	$this->plugin->add_label('create', 'cancel', 'filecreating', 'createfile', 'createandedit',
	'copyfile', 'copyandedit');
	$this->rc->output->add_gui_object('file-create-form', $attrib['id']);
	$this->rc->output->set_env('file_extensions', $types);

	return $out;
	}

	/**
	* Template object for file search form in "From cloud" dialog
	*/
	public function file_search_form($attrib)
	{
	$attrib['name'] = '_q';

	if (empty($attrib['id'])) {
	$attrib['id'] = 'filesearchbox';
	}
	if ($attrib['type'] == 'search' && !$this->rc->output->browser->khtml) {
	unset($attrib['type'], $attrib['results']);
	}

	$input_q = new html_inputfield($attrib);
	$out = $input_q->show();

	// add some labels to client
	$this->rc->output->add_label('searching');
	$this->rc->output->add_gui_object('filesearchbox', $attrib['id']);

	// add form tag around text field
	if (empty($attrib['form'])) {
	$out = $this->rc->output->form_tag(array(
	'action' => '?_task=files',
	'name' => "filesearchform",
	'onsubmit' => rcmail_output::JS_OBJECT_NAME . ".command('files-search'); return false",
	), $out);
	}

	return $out;
	}

	/**
	* Template object for files list
	*/
	public function file_list($attrib)
	{
	return $this->list_handler($attrib, 'files');
	}

	/**
	* Template object for sessions list
	*/
	public function sessions_list($attrib)
	{
	return $this->list_handler($attrib, 'sessions');
	}

	/**
	* Creates unified template object for files\|sessions list
	*/
	protected function list_handler($attrib, $type = 'files')
	{
	$prefix = 'kolab_' . $type . '_';
	$c_prefix = 'kolab_files' . ($type != 'files' ? '_' . $type : '') . '_';

	// define list of cols to be displayed based on parameter or config
	if (empty($attrib['columns'])) {
	$list_cols = $this->rc->config->get($c_prefix . 'list_cols');
	$dont_override = $this->rc->config->get('dont_override');
	$a_show_cols = is_array($list_cols) ? $list_cols : array('name');
	$this->rc->output->set_env($type . '_col_movable', !in_array($c_prefix . 'list_cols', (array)$dont_override));
	}
	else {
	$columns = str_replace(array("'", '"'), '', $attrib['columns']);
	$a_show_cols = preg_split('/[\s,;]+/', $columns);
	}

	// make sure 'name' and 'options' column is present
	if (!in_array('name', $a_show_cols)) {
	array_unshift($a_show_cols, 'name');
	}
	if (!in_array('options', $a_show_cols)) {
	array_unshift($a_show_cols, 'options');
	}

	$attrib['columns'] = $a_show_cols;

	// save some variables for use in ajax list
	$_SESSION[$prefix . 'list_attrib'] = $attrib;

	// For list in dialog(s) remove all option-like columns
	if ($this->rc->task != 'files') {
	$a_show_cols = array_intersect($a_show_cols, $this->{$type . '_sort_cols'});
	}

	// set default sort col/order to session
	if (!isset($_SESSION[$prefix . 'sort_col']))
	$_SESSION[$prefix . 'sort_col'] = $this->rc->config->get($c_prefix . 'sort_col') ?: 'name';
	if (!isset($_SESSION[$prefix . 'sort_order']))
	$_SESSION[$prefix . 'sort_order'] = strtoupper($this->rc->config->get($c_prefix . 'sort_order') ?: 'asc');

	// set client env
	$this->rc->output->add_gui_object($type . 'list', $attrib['id']);
	$this->rc->output->set_env($type . '_sort_col', $_SESSION[$prefix . 'sort_col']);
	$this->rc->output->set_env($type . '_sort_order', $_SESSION[$prefix . 'sort_order']);
	$this->rc->output->set_env($type . '_coltypes', $a_show_cols);

	$this->rc->output->include_script('list.js');

	// attach css rules for mimetype icons
	if (!$this->filetypes_style) {
	$this->plugin->include_stylesheet($this->url . '/skins/default/images/mimetypes/style.css');
	$this->filetypes_style = true;
	}

	$thead = '';
	foreach ($this->list_head($attrib, $a_show_cols, $type) as $cell) {
	$thead .= html::tag('th', array('class' => $cell['className'], 'id' => $cell['id']), $cell['html']);
	}

	return html::tag('table', $attrib,
	html::tag('thead', null, html::tag('tr', null, $thead)) . html::tag('tbody', null, ''),
	array('style', 'class', 'id', 'cellpadding', 'cellspacing', 'border', 'summary'));
	}

	/**
	* Creates <THEAD> for message list table
	*/
	protected function list_head($attrib, $a_show_cols, $type = 'files')
	{
	$prefix = 'kolab_' . $type . '_';
	$c_prefix = 'kolab_files_' . ($type != 'files' ? $type : '') . '_';
	$skin_path = $_SESSION['skin_path'];

	// check to see if we have some settings for sorting
	$sort_col = $_SESSION[$prefix . 'sort_col'];
	$sort_order = $_SESSION[$prefix . 'sort_order'];

	$dont_override = (array)$this->rc->config->get('dont_override');
	$disabled_sort = in_array($c_prefix . 'sort_col', $dont_override);
	$disabled_order = in_array($c_prefix . 'sort_order', $dont_override);

	$this->rc->output->set_env($prefix . 'disabled_sort_col', $disabled_sort);
	$this->rc->output->set_env($prefix . 'disabled_sort_order', $disabled_order);

	// define sortable columns
	if ($disabled_sort)
	$a_sort_cols = $sort_col && !$disabled_order ? array($sort_col) : array();
	else
	$a_sort_cols = $this->{$type . '_sort_cols'};

	if (!empty($attrib['optionsmenuicon'])) {
	$onclick = 'return ' . rcmail_output::JS_OBJECT_NAME . ".command('menu-open', '{$type}listmenu', this, event)";
	$inner = $this->rc->gettext('listoptions');

	if (is_string($attrib['optionsmenuicon']) && $attrib['optionsmenuicon'] != 'true') {
	$inner = html::img(array('src' => $skin_path . $attrib['optionsmenuicon'], 'alt' => $this->rc->gettext('listoptions')));
	}

	$list_menu = html::a(array(
	'href' => '#list-options',
	'onclick' => $onclick,
	'class' => 'listmenu',
	'id' => $type . 'listmenulink',
	'title' => $this->rc->gettext('listoptions'),
	'tabindex' => '0',
	), $inner);
	}
	else {
	$list_menu = '';
	}

	$cells = array();

	foreach ($a_show_cols as $col) {
	// get column name
	switch ($col) {
	case 'options':
	$col_name = $list_menu;
	break;
	default:
	$col_name = rcube::Q($this->plugin->gettext($col));
	}

	// make sort links
	if (in_array($col, $a_sort_cols)) {
	$col_name = html::a(array(
	'href' => "#sort",
	'onclick' => 'return ' . rcmail_output::JS_OBJECT_NAME . ".command('$type-sort','$col',this)",
	'title' => $this->plugin->gettext('sortby')
	), $col_name);
	}
	else if ($col_name[0] != '<') {
	$col_name = '<span class="' . $col .'">' . $col_name . '</span>';
	}

	$sort_class = $col == $sort_col && !$disabled_order ? " sorted$sort_order" : '';
	$class_name = $col.$sort_class;

	// put it all together
	$cells[] = array('className' => $class_name, 'id' => "rcm$col", 'html' => $col_name);
	}

	return $cells;
	}

	/**
	* Update files\|sessions list object
	*/
	protected function list_update($prefs, $type = 'files')
	{
	$prefix = 'kolab_' . $type . '_list_';
	$c_prefix = 'kolab_files' . ($type != 'files' ? '_' . $type : '') . '_list_';
	$attrib = $_SESSION[$prefix . 'attrib'];

	if (!empty($prefs[$c_prefix . 'cols'])) {
	$attrib['columns'] = $prefs[$c_prefix . 'cols'];
	$_SESSION[$prefix . 'attrib'] = $attrib;
	}

	$a_show_cols = $attrib['columns'];
	$head = '';

	foreach ($this->list_head($attrib, $a_show_cols, $type) as $cell) {
	$head .= html::tag('th', array('class' => $cell['className'], 'id' => $cell['id']), $cell['html']);
	}

	$head = html::tag('tr', null, $head);

	$this->rc->output->set_env($type . '_coltypes', $a_show_cols);
	$this->rc->output->command($type . '_list_update', $head);
	}

	/**
	* Template object for file info box
	*/
	public function file_info_box($attrib)
	{
	// print_r($this->file_data, true);
	$table = new html_table(array('cols' => 2, 'class' => $attrib['class']));

	// file name
	$table->add('label', $this->plugin->gettext('name').':');
	$table->add('data filename', $this->file_data['name']);

	// file type
	// @TODO: human-readable type name
	$table->add('label', $this->plugin->gettext('type').':');
	$table->add('data filetype', $this->file_data['type']);

	// file size
	$table->add('label', $this->plugin->gettext('size').':');
	$table->add('data filesize', $this->rc->show_bytes($this->file_data['size']));

	// file modification time
	$table->add('label', $this->plugin->gettext('mtime').':');
	$table->add('data filemtime', $this->file_data['mtime']);

	// @TODO: for images: width, height, color depth, etc.
	// @TODO: for text files: count of characters, lines, words

	return $table->show();
	}

	/**
	* Template object for file preview frame
	*/
	public function file_preview_frame($attrib)
	{
	if (empty($attrib['id'])) {
	$attrib['id'] = 'filepreviewframe';
	}

	if ($frame = $this->file_data['viewer']['frame']) {
	return $frame;
	}

	if ($href = $this->file_data['viewer']['href']) {
	// file href attribute must be an absolute URL (Bug #2063)
	if (!empty($href)) {
	if (!preg_match('\|^https?://\|', $href)) {
	$href = $this->url . '/api/' . $href;
	}
	}
	}
	else {
	$token = $this->get_api_token();
	$href = $this->url . '/api/?method=file_get'
	. '&file=' . urlencode($this->file_data['filename'])
	. '&token=' . urlencode($token);
	}

	$this->rc->output->add_gui_object('preview_frame', $attrib['id']);

	$attrib['allowfullscreen'] = true;
	$attrib['src'] = $href;
	$attrib['onload'] = 'kolab_files_frame_load(this)';

	// editor requires additional arguments via POST
	if (!empty($this->file_data['viewer']['post'])) {
	$attrib['src'] = 'program/resources/blank.gif';

	$form_content = new html_hiddenfield();
	$form_attrib = array(
	'action' => $href,
	'id' => $attrib['id'] . '-form',
	'target' => $attrib['name'],
	'method' => 'post',
	);

	foreach ($this->file_data['viewer']['post'] as $name => $value) {
	$form_content->add(array('name' => $name, 'value' => $value));
	}

	$form = html::tag('form', $form_attrib, $form_content->show())
	. html::script(array(), "\$('#{$attrib['id']}-form').submit()");
	}

	return html::iframe($attrib) . $form;
	}

	/**
	* Template object for quota display
	*/
	public function quota_display($attrib)
	{
	if (!$attrib['id']) {
	$attrib['id'] = 'rcmquotadisplay';
	}

	$quota_type = !empty($attrib['display']) ? $attrib['display'] : 'text';

	$this->rc->output->add_gui_object('quotadisplay', $attrib['id']);
	$this->rc->output->set_env('quota_type', $quota_type);

	// get quota
	$token = $this->get_api_token();
	$request = $this->get_request(array('method' => 'quota'), $token);

	// send request to the API
	try {
	$response = $request->send();
	$status = $response->getStatus();
	$body = @json_decode($response->getBody(), true);

	if ($status == 200 && $body['status'] == 'OK') {
	$quota = $body['result'];
	}
	else {
	throw new Exception($body['reason'] ?: "Failed to get quota. Status: $status");
	}
	}
	catch (Exception $e) {
	rcube::raise_error($e, true, false);
	$quota = array('total' => 0, 'percent' => 0);
	}

	$quota = rcube_output::json_serialize($quota);

	$this->rc->output->add_script(rcmail_output::JS_OBJECT_NAME . ".files_set_quota($quota);", 'docready');

	return html::span($attrib, '');
	}

	/**
	* Get API token for current user session, authenticate if needed
	*/
	public function get_api_token($configure = true)
	{
	$token = $_SESSION['kolab_files_token'];
	$time = $_SESSION['kolab_files_time'];

	if ($token && time() - $this->timeout < $time) {
	if (time() - $time <= $this->timeout / 2) {
	return $token;
	}
	}

	$request = $this->get_request(array('method' => 'ping'), $token);

	try {
	$url = $request->getUrl();

	// Send ping request
	if ($token) {
	$url->setQueryVariables(array('method' => 'ping'));
	$request->setUrl($url);
	$response = $request->send();
	$status = $response->getStatus();

	if ($status == 200 && ($body = json_decode($response->getBody(), true))) {
	if ($body['status'] == 'OK') {
	$_SESSION['kolab_files_time'] = time();
	return $token;
	}
	}
	}

	// Go with authenticate request
	$url->setQueryVariables(array('method' => 'authenticate', 'version' => self::API_VERSION));
	$request->setUrl($url);
	$request->setAuth($this->rc->user->get_username(), $this->rc->decrypt($_SESSION['password']));
	$response = $request->send();
	$status = $response->getStatus();

	if ($status == 200 && ($body = json_decode($response->getBody(), true))) {
	$token = $body['result']['token'];

	if ($token) {
	$_SESSION['kolab_files_token'] = $token;
	$_SESSION['kolab_files_time'] = time();
	$_SESSION['kolab_files_caps'] = $body['result']['capabilities'];
	}
	}
	else {
	throw new Exception(sprintf("Authenticate error (Status: %d)", $status));
	}

	// Configure session
	if ($configure && $token) {
	$this->configure($token);
	}
	}
	catch (Exception $e) {
	rcube::raise_error($e, true, false);
	}

	return $token;
	}

	/**
	* Initialize HTTP_Request object
	*/
	protected function get_request($get = null, $token = null)
	{
	$url = $this->url_srv . '/api/';

	if (!$this->request) {
	$config = array(
	'store_body' => true,
	'follow_redirects' => true,
	);

	$this->request = libkolab::http_request($url, 'GET', $config);
	}
	else {
	// cleanup
	try {
	$this->request->setBody('');
	$this->request->setUrl($url);
	$this->request->setMethod(HTTP_Request2::METHOD_GET);
	}
	catch (Exception $e) {
	rcube::raise_error($e, true, true);
	}
	}

	if ($token) {
	$this->request->setHeader('X-Session-Token', $token);
	}

	if (!empty($get)) {
	$url = $this->request->getUrl();
	$url->setQueryVariables($get);
	$this->request->setUrl($url);
	}

	// some HTTP server configurations require this header
	$this->request->setHeader('accept', "application/json,text/javascript,/");

	// Localization
	$this->request->setHeader('accept-language', $_SESSION['language']);

	// set Referer which is used as an origin for cross-window
	// communication with document editor iframe
	$host = $_SERVER['REQUEST_SCHEME'] . '://' . $_SERVER['HTTP_HOST'];
	$this->request->setHeader('referer', $host);

	return $this->request;
	}

	/**
	* Configure chwala session
	*/
	public function configure($token = null, $prefs = array())
	{
	if (!$token) {
	$token = $this->get_api_token(false);
	}

	try {
	// Configure session
	$query = array(
	'method' => 'configure',
	'timezone' => $prefs['timezone'] ?: $this->rc->config->get('timezone'),
	'date_format' => $prefs['date_long'] ?: $this->rc->config->get('date_long', 'Y-m-d H:i'),
	);

	$request = $this->get_request($query, $token);
	$response = $request->send();
	$status = $response->getStatus();

	if ($status != 200) {
	throw new Exception(sprintf("Failed to configure chwala session (Status: %d)", $status));
	}
	}
	catch (Exception $e) {
	rcube::raise_error($e, true, false);
	}
	}

	/**
	* Handler for main files interface (Files task)
	*/
	protected function action_index()
	{
	$this->plugin->add_label(
	'uploading', 'attaching', 'searching', 'uploadsizeerror',
	'filedeleting', 'filedeletenotice', 'filedeleteconfirm',
	'filemoving', 'filemovenotice', 'filemoveconfirm', 'filecopying', 'filecopynotice',
	'fileskip', 'fileskipall', 'fileoverwrite', 'fileoverwriteall'
	);

	$this->folder_list_env();

	if ($this->rc->task == 'files') {
	$this->rc->output->set_env('folder', rcube_utils::get_input_value('folder', rcube_utils::INPUT_GET));
	$this->rc->output->set_env('collection', rcube_utils::get_input_value('collection', rcube_utils::INPUT_GET));
	}

	$this->rc->output->add_label('uploadprogress', 'GB', 'MB', 'KB', 'B');
	$this->rc->output->set_pagetitle($this->plugin->gettext('files'));
	$this->rc->output->set_env('file_mimetypes', $this->get_mimetypes());
	$this->rc->output->set_env('files_quota', $_SESSION['kolab_files_caps']['QUOTA']);
	$this->rc->output->set_env('files_max_upload', $_SESSION['kolab_files_caps']['MAX_UPLOAD']);
	$this->rc->output->set_env('files_progress_name', $_SESSION['kolab_files_caps']['PROGRESS_NAME']);
	$this->rc->output->set_env('files_progress_time', $_SESSION['kolab_files_caps']['PROGRESS_TIME']);
	$this->rc->output->send('kolab_files.files');
	}

	/**
	* Handler for preferences save action
	*/
	protected function action_prefs()
	{
	$dont_override = (array)$this->rc->config->get('dont_override');
	$prefs = array();
	$type = rcube_utils::get_input_value('type', rcube_utils::INPUT_POST);
	$opts = array(
	'kolab_files_sort_col' => true,
	'kolab_files_sort_order' => true,
	'kolab_files_list_cols' => false,
	);

	foreach ($opts as $o => $sess) {
	if (isset($_POST[$o])) {
	$value = rcube_utils::get_input_value($o, rcube_utils::INPUT_POST);
	$session_key = $o;
	$config_key = $o;

	if ($type != 'files') {
	$config_key = str_replace('files', 'files_' . $type, $config_key);
	}

	if (in_array($config_key, $dont_override)) {
	continue;
	}

	if ($o == 'kolab_files_list_cols') {
	$update_list = true;
	}

	$prefs[$config_key] = $value;
	if ($sess) {
	$_SESSION[$session_key] = $prefs[$config_key];
	}
	}
	}

	// save preference values
	if (!empty($prefs)) {
	$this->rc->user->save_prefs($prefs);
	}

	if (!empty($update_list)) {
	$this->list_update($prefs, $type);
	}

	$this->rc->output->send();
	}

	/**
	* Handler for file open action
	*/
	protected function action_open()
	{
	$this->rc->output->set_env('file_mimetypes', $this->get_mimetypes());

	$this->file_opener(intval($_GET['_viewer']) & ~4);
	}

	/**
	* Handler for file open action
	*/
	protected function action_edit()
	{
	$this->plugin->add_label('sessionterminating', 'unsavedchanges', 'documentinviting',
	'documentcancelling', 'removeparticipant', 'sessionterminated', 'sessionterminatedtitle');

	$this->file_opener(intval($_GET['_viewer']));
	}

	/**
	* Handler for "save all attachments into cloud" action
	*/
	protected function action_save_file()
	{
	// $source = rcube_utils::get_input_value('source', rcube_utils::INPUT_POST);
	$uid = rcube_utils::get_input_value('uid', rcube_utils::INPUT_POST);
	$dest = rcube_utils::get_input_value('dest', rcube_utils::INPUT_POST);
	$id = rcube_utils::get_input_value('id', rcube_utils::INPUT_POST);
	$name = rcube_utils::get_input_value('name', rcube_utils::INPUT_POST);

	$temp_dir = unslashify($this->rc->config->get('temp_dir'));
	$message = new rcube_message($uid);
	$request = $this->get_request();
	$url = $request->getUrl();
	$files = array();
	$errors = array();
	$attachments = array();

	$request->setMethod(HTTP_Request2::METHOD_POST);
	$request->setHeader('X-Session-Token', $this->get_api_token());
	$url->setQueryVariables(array('method' => 'file_upload', 'folder' => $dest));
	$request->setUrl($url);

	foreach ($message->attachments as $attach_prop) {
	if (empty($id) \|\| $id == $attach_prop->mime_id) {
	$filename = strlen($name) ? $name : rcmail_attachment_name($attach_prop, true);
	$attachments[$filename] = $attach_prop;
	}
	}

	// @TODO: handle error
	// @TODO: implement file upload using file URI instead of body upload

	foreach ($attachments as $attach_name => $attach_prop) {
	$path = tempnam($temp_dir, 'rcmAttmnt');

	// save attachment to file
	if ($fp = fopen($path, 'w+')) {
	$message->get_part_body($attach_prop->mime_id, false, 0, $fp);
	}
	else {
	$errors[] = true;
	rcube::raise_error(array(
	'code' => 500, 'type' => 'php', 'line' => __LINE__, 'file' => __FILE__,
	'message' => "Unable to save attachment into file $path"),
	true, false);
	continue;
	}

	fclose($fp);

	// send request to the API
	try {
	$request->setBody('');
	$request->addUpload('file[]', $path, $attach_name, $attach_prop->mimetype);
	$response = $request->send();
	$status = $response->getStatus();
	$body = @json_decode($response->getBody(), true);

	if ($status == 200 && $body['status'] == 'OK') {
	$files[] = $attach_name;
	}
	else {
	throw new Exception($body['reason'] ?: "Failed to post file_upload. Status: $status");
	}
	}
	catch (Exception $e) {
	unlink($path);
	$errors[] = $e->getMessage();
	rcube::raise_error(array(
	'code' => 500, 'type' => 'php', 'line' => __LINE__, 'file' => __FILE__,
	'message' => $e->getMessage()),
	true, false);
	continue;
	}

	// clean up
	unlink($path);
	$request->setBody('');
	}

	if ($count = count($files)) {
	$msg = $this->plugin->gettext(array('name' => 'saveallnotice', 'vars' => array('n' => $count)));
	$this->rc->output->show_message($msg, 'confirmation');
	}
	if ($count = count($errors)) {
	$msg = $this->plugin->gettext(array('name' => 'saveallerror', 'vars' => array('n' => $count)));
	$this->rc->output->show_message($msg, 'error');
	}

	// @TODO: update quota indicator, make this optional in case files aren't stored in IMAP

	$this->rc->output->send();
	}

	/**
	* Handler for "add attachments from the cloud" action
	*/
	protected function action_attach_file()
	{
	$files = rcube_utils::get_input_value('files', rcube_utils::INPUT_POST);
	$uploadid = rcube_utils::get_input_value('uploadid', rcube_utils::INPUT_POST);
	$COMPOSE_ID = rcube_utils::get_input_value('id', rcube_utils::INPUT_POST);
	$COMPOSE = null;
	$errors = array();
	$attachments = array();

	if ($this->rc->task == 'mail') {
	if ($COMPOSE_ID && $_SESSION['compose_data_'.$COMPOSE_ID]) {
	$COMPOSE =& $_SESSION['compose_data_'.$COMPOSE_ID];
	}

	if (!$COMPOSE) {
	die("Invalid session var!");
	}

	// attachment upload action
	if (!is_array($COMPOSE['attachments'])) {
	$COMPOSE['attachments'] = array();
	}
	}

	// clear all stored output properties (like scripts and env vars)
	$this->rc->output->reset();

	$temp_dir = unslashify($this->rc->config->get('temp_dir'));
	$request = $this->get_request();
	$url = $request->getUrl();

	// Use observer object to store HTTP response into a file
	require_once $this->plugin->home . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . 'kolab_files_observer.php';
	$observer = new kolab_files_observer();

	$request->setHeader('X-Session-Token', $this->get_api_token());

	// download files from the API and attach them
	foreach ($files as $file) {
	// decode filename
	$file = urldecode($file);

	// get file information
	try {
	$url->setQueryVariables(array('method' => 'file_info', 'file' => $file));
	$request->setUrl($url);
	$response = $request->send();
	$status = $response->getStatus();
	$body = @json_decode($response->getBody(), true);

	if ($status == 200 && $body['status'] == 'OK') {
	$file_params = $body['result'];
	}
	else {
	throw new Exception($body['reason'] ?: "Failed to get file_info. Status: $status");
	}
	}
	catch (Exception $e) {
	$errors[] = $e->getMessage();
	rcube::raise_error(array(
	'code' => 500, 'type' => 'php', 'line' => __LINE__, 'file' => __FILE__,
	'message' => $e->getMessage()),
	true, false);
	continue;
	}

	// set location of downloaded file
	$path = tempnam($temp_dir, 'rcmAttmnt');
	$observer->set_file($path);

	// download file
	try {
	$url->setQueryVariables(array('method' => 'file_get', 'file' => $file));
	$request->setUrl($url);
	$request->attach($observer);
	$response = $request->send();
	$status = $response->getStatus();
	$response->getBody(); // returns nothing
	$request->detach($observer);

	if ($status != 200 \|\| !file_exists($path)) {
	throw new Exception("Unable to save file");
	}
	}
	catch (Exception $e) {
	$errors[] = $e->getMessage();
	rcube::raise_error(array(
	'code' => 500, 'type' => 'php', 'line' => __LINE__, 'file' => __FILE__,
	'message' => $e->getMessage()),
	true, false);
	continue;
	}

	$attachment = array(
	'path' => $path,
	'size' => $file_params['size'],
	'name' => $file_params['name'],
	'mimetype' => $file_params['type'],
	'group' => $COMPOSE_ID,
	);

	if ($this->rc->task != 'mail') {
	$attachments[] = $attachment;
	continue;
	}

	$attachment = $this->rc->plugins->exec_hook('attachment_save', $attachment);

	if ($attachment['status'] && !$attachment['abort']) {
	$id = $attachment['id'];

	// store new attachment in session
	unset($attachment['data'], $attachment['status'], $attachment['abort']);
	$COMPOSE['attachments'][$id] = $attachment;

	if (($icon = $COMPOSE['deleteicon']) && is_file($icon)) {
	$button = html::img(array(
	'src' => $icon,
	'alt' => $this->rc->gettext('delete')
	));
	}
	else {
	$button = rcube::Q($this->rc->gettext('delete'));
	}

	$content = html::a(array(
	'href' => "#delete",
	'onclick' => sprintf("return %s.command('remove-attachment','rcmfile%s', this)", rcmail_output::JS_OBJECT_NAME, $id),
	'title' => $this->rc->gettext('delete'),
	'class' => 'delete',
	), $button);

	$content .= rcube::Q($attachment['name']);

	$this->rc->output->command('add2attachment_list', "rcmfile$id", array(
	'html' => $content,
	'name' => $attachment['name'],
	'mimetype' => $attachment['mimetype'],
	'classname' => rcube_utils::file2class($attachment['mimetype'], $attachment['name']),
	'complete' => true), $uploadid);
	}
	else if ($attachment['error']) {
	$errors[] = $attachment['error'];
	}
	else {
	$errors[] = $this->plugin->gettext('attacherror');
	}
	}

	if (!empty($errors)) {
	$this->rc->output->command('display_message', $this->plugin->gettext('attacherror'), 'error');
	$this->rc->output->command('remove_from_attachment_list', $uploadid);
	}
	else if ($this->rc->task == 'calendar' \|\| $this->rc->task == 'tasks') {
	// for uploads in events/tasks we'll use its standard upload handler,
	// for this we have to fake $_FILES and some other POST args
	foreach ($attachments as $attach) {
	$_FILES['_attachments']['tmp_name'][] = $attachment['path'];
	$_FILES['_attachments']['name'][] = $attachment['name'];
	$_FILES['_attachments']['size'][] = $attachment['size'];
	$_FILES['_attachments']['type'][] = $attachment['mimetype'];
	$_FILES['_attachments']['error'][] = null;
	}

	$_GET['_uploadid'] = $uploadid;
	$_GET['_id'] = $COMPOSE_ID;

	switch ($this->rc->task) {
	case 'tasks':
	libcalendaring::get_instance()->attachment_upload(tasklist::SESSION_KEY);
	break;

	case 'calendar':
	libcalendaring::get_instance()->attachment_upload(calendar::SESSION_KEY, 'cal-');
	break;
	}
	}

	// send html page with JS calls as response
	$this->rc->output->command('auto_save_start', false);
	$this->rc->output->send();
	}

	/**
	* Handler for file open/edit action
	*/
	protected function file_opener($viewer)
	{
	$file = rcube_utils::get_input_value('_file', rcube_utils::INPUT_GET);
	$session = rcube_utils::get_input_value('_session', rcube_utils::INPUT_GET);

	// get file info
	$token = $this->get_api_token();
	$request = $this->get_request(array(
	'method' => 'file_info',
	'file' => $file,
	'viewer' => $viewer,
	'session' => $session,
	), $token);

	// send request to the API
	try {
	$response = $request->send();
	$status = $response->getStatus();
	$body = @json_decode($response->getBody(), true);

	if ($status == 200 && $body['status'] == 'OK') {
	$this->file_data = $body['result'];
	}
	else {
	throw new Exception($body['reason'] ?: "Failed to get file_info. Status: $status");
	}
	}
	catch (Exception $e) {
	rcube::raise_error(array(
	'code' => 500, 'type' => 'php', 'line' => __LINE__, 'file' => __FILE__,
	'message' => $e->getMessage()),
	true, true);
	}

	if ($file === null \|\| $file === '') {
	$file = $this->file_data['file'];
	}

	$this->file_data['filename'] = $file;

	$this->plugin->add_label('filedeleteconfirm', 'filedeleting', 'filedeletenotice');

	// register template objects for dialogs (and main interface)
	$this->rc->output->add_handlers(array(
	'fileinfobox' => array($this, 'file_info_box'),
	'filepreviewframe' => array($this, 'file_preview_frame'),
	));

	$placeholder = $this->rc->output->asset_url('program/resources/blank.gif');

	if ($this->file_data['viewer']['wopi']) {
	$editor_type = 'wopi';
	$got_editor = ($viewer & 4);
	}
	else if ($this->file_data['viewer']['manticore']) {
	$editor_type = 'manticore';
	$got_editor = ($viewer & 4);
	}

	// this one is for styling purpose
	$this->rc->output->set_env('extwin', true);
	$this->rc->output->set_env('file', $file);
	$this->rc->output->set_env('file_data', $this->file_data);
	$this->rc->output->set_env('editor_type', $editor_type);
	$this->rc->output->set_env('photo_placeholder', $placeholder);
	$this->rc->output->set_pagetitle(rcube::Q($file));
	$this->rc->output->send('kolab_files.' . ($got_editor ? 'docedit' : 'filepreview'));
	}

	/**
	* Returns mimetypes supported by File API viewers
	*/
	protected function get_mimetypes($type = 'view')
	{
	$mimetypes = array();

	// send request to the API
	try {
	if ($this->mimetypes === null) {
	$this->mimetypes = false;

	$token = $this->get_api_token();
	$request = $this->get_request(array('method' => 'mimetypes'), $token);
	$response = $request->send();
	$status = $response->getStatus();
	$body = @json_decode($response->getBody(), true);

	if ($status == 200 && $body['status'] == 'OK') {
	$this->mimetypes = $body['result'];
	}
	else {
	throw new Exception($body['reason'] ?: "Failed to get mimetypes. Status: $status");
	}
	}

	if (is_array($this->mimetypes)) {
	if (array_key_exists($type, $this->mimetypes)) {
	$mimetypes = $this->mimetypes[$type];
	}
	// fallback to static definition if old Chwala is used
	else if ($type == 'edit') {
	$mimetypes = array(
	'text/plain' => 'txt',
	'text/html' => 'html',
	);
	if (!empty($_SESSION['kolab_files_caps']['MANTICORE'])) {
	$mimetypes = array_merge(array('application/vnd.oasis.opendocument.text' => 'odt'), $mimetypes);
	}

	foreach (array_keys($mimetypes) as $type) {
	list ($app, $label) = explode('/', $type);
	$label = preg_replace('/[^a-z]/', '', $label);
	$mimetypes[$type] = array(
	'ext' => $mimetypes[$type],
	'label' => $this->plugin->gettext('type.' . $label),
	);
	}
	}
	else {
	$mimetypes = $this->mimetypes;
	}
	}
	}
	catch (Exception $e) {
	rcube::raise_error(array(
	'code' => 500, 'type' => 'php', 'line' => __LINE__, 'file' => __FILE__,
	'message' => $e->getMessage()),
	true, false);
	}

	return $mimetypes;
	}

	/**
	* Get list of available external storage drivers
	*/
	protected function get_external_storage_drivers()
	{
	// first get configured sources from Chwala
	$token = $this->get_api_token();
	$request = $this->get_request(array('method' => 'folder_types'), $token);

	// send request to the API
	try {
	$response = $request->send();
	$status = $response->getStatus();
	$body = @json_decode($response->getBody(), true);

	if ($status == 200 && $body['status'] == 'OK') {
	$sources = $body['result'];
	}
	else {
	throw new Exception($body['reason'] ?: "Failed to get folder_types. Status: $status");
	}
	}
	catch (Exception $e) {
	rcube::raise_error($e, true, false);
	return;
	}

	$this->rc->output->set_env('external_sources', $sources);
	}

	/**
	* Registers translation labels for folder lists in UI
	*/
	protected function folder_list_env()
	{
	// folder list and actions
	$this->plugin->add_label(
	'folderdeleting', 'folderdeleteconfirm', 'folderdeletenotice',
	'collection_audio', 'collection_video', 'collection_image', 'collection_document',
	'additionalfolders', 'listpermanent'
	);
	$this->rc->output->add_label('foldersubscribing', 'foldersubscribed',
	'folderunsubscribing', 'folderunsubscribed', 'searching'
	);
	}
	}

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