ContactsBackend.php
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ContactsBackend.php
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	<?php

	/**
	* SabreDAV Contacts backend for Kolab.
	*
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2013, 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/>.
	*/

	namespace Kolab\CardDAV;

	use \rcube;
	use \rcube_charset;
	use \kolab_storage;
	use Sabre\DAV;
	use Sabre\CardDAV;
	use Sabre\VObject;
	use Kolab\Utils\DAVBackend;
	use Kolab\Utils\VObjectUtils;

	/**
	* Kolab Contacts backend.
	*
	* Checkout the Sabre\CardDAV\Backend\BackendInterface for all the methods that must be implemented.
	*/
	class ContactsBackend extends CardDAV\Backend\AbstractBackend
	{
	private $sources;
	private $folders;
	private $aliases;
	private $useragent;


	/**
	* Read available contact folders from server
	*/
	private function _read_sources()
	{
	// already read sources
	if (isset($this->sources))
	return $this->sources;

	// get all folders that have "contact" type
	$folders = kolab_storage::get_folders('contact');
	$this->sources = $this->folders = $this->aliases = array();

	foreach (DAVBackend::sort_folders($folders) as $folder) {
	$id = DAVBackend::get_uid($folder);
	$fdata = $folder->get_imap_data(); // fetch IMAP folder data for CTag generation
	$this->folders[$id] = $folder;
	$this->sources[$id] = array(
	'id' => $id,
	'uri' => $id,
	'{DAV:}displayname' => html_entity_decode($folder->get_name(), ENT_COMPAT, RCUBE_CHARSET),
	'{http://calendarserver.org/ns/}getctag' => sprintf('%d-%d-%d', $fdata['UIDVALIDITY'], $fdata['HIGHESTMODSEQ'], $fdata['UIDNEXT']),
	'{urn:ietf:params:xml:ns:caldav}supported-address-data' => new CardDAV\Property\SupportedAddressData(),
	);
	$this->aliases[$folder->name] = $id;

	// map default folder to the magic 'all' resource
	if ($folder->default)
	$this->aliases['__all__'] = $id;
	}

	return $this->sources;
	}


	/**
	* Getter for a kolab_storage_folder representing the address book for the given ID
	*
	* @param string Folder ID
	* @return object kolab_storage_folder instance
	*/
	public function get_storage_folder($id)
	{
	// resolve alias name
	if ($this->aliases[$id]) {
	$id = $this->aliases[$id];
	}

	if ($this->folders[$id]) {
	return $this->folders[$id];
	}
	else {
	return DAVBackend::get_storage_folder($id, 'contact');
	}
	}


	/**
	* Returns the list of addressbooks for a specific user.
	*
	* @param string $principalUri
	* @return array
	*/
	public function getAddressBooksForUser($principalUri)
	{
	console(__METHOD__, $principalUri, $this->useragent);

	$this->_read_sources();

	// special case for the apple address book which only supports one (!) address book
	if ($this->useragent == 'macosx' && count($this->sources) > 1) {
	$source = $this->getAddressBookByName('__all__');
	$source['principaluri'] = $principalUri;
	return array($source);
	}

	$addressBooks = array();
	foreach ($this->sources as $id => $source) {
	$source['principaluri'] = $principalUri;
	$addressBooks[] = $source;
	}

	return $addressBooks;
	}

	/**
	* Returns properties for a specific node identified by name/uri
	*
	* @param string Node name/uri
	* @return array Hash array with addressbook properties or null if not found
	*/
	public function getAddressBookByName($addressBookUri)
	{
	console(__METHOD__, $addressBookUri);

	$this->_read_sources();
	$id = $addressBookUri;

	// return the magic single address book for Apple's Address Book App
	if ($id == '__all__') {
	$ctags = array();
	foreach ($this->sources as $source) {
	$ctags[] = $source['{http://calendarserver.org/ns/}getctag'];
	}

	return array(
	'id' => '__all__',
	'uri' => '__all__',
	'{DAV:}displayname' => 'All',
	'{http://calendarserver.org/ns/}getctag' => join(':', $ctags),
	'{urn:ietf:params:xml:ns:caldav}supported-address-data' => new CardDAV\Property\SupportedAddressData(),
	);
	}

	// resolve aliases (addressbook by folder name)
	if ($this->aliases[$addressBookUri]) {
	$id = $this->aliases[$addressBookUri];
	}

	return $this->sources[$id];
	}

	/**
	* Updates an addressbook's properties
	*
	* See Sabre\DAV\IProperties for a description of the mutations array, as
	* well as the return value.
	*
	* @param mixed $addressBookId
	* @param array $mutations
	* @see Sabre\DAV\IProperties::updateProperties
	* @return bool\|array
	*/
	public function updateAddressBook($addressBookId, array $mutations)
	{
	console(__METHOD__, $addressBookId, $mutations);

	if ($addressBookId == '__all__')
	return false;

	$folder = $this->get_storage_folder($addressBookId);
	return $folder ? DAVBackend::folder_update($folder, $mutations) : false;
	}

	/**
	* Creates a new address book
	*
	* @param string $principalUri
	* @param string $url Just the 'basename' of the url.
	* @param array $properties
	* @return void
	*/
	public function createAddressBook($principalUri, $url, array $properties)
	{
	console(__METHOD__, $principalUri, $url, $properties);

	return DAVBackend::folder_create('contact', $properties, $url);
	}

	/**
	* Deletes an entire addressbook and all its contents
	*
	* @param int $addressBookId
	* @return void
	*/
	public function deleteAddressBook($addressBookId)
	{
	console(__METHOD__, $addressBookId);

	if ($addressBookId == '__all__')
	return;

	$folder = $this->get_storage_folder($addressBookId);
	if ($folder && !kolab_storage::folder_delete($folder->name)) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error deleting calendar folder $folder->name"),
	true, false);
	}
	}

	/**
	* Returns all cards for a specific addressbook id.
	*
	* This method should return the following properties for each card:
	* * carddata - raw vcard data
	* * uri - Some unique url
	* * lastmodified - A unix timestamp
	* * etag - A unique etag. This must change every time the card changes.
	* * size - The size of the card in bytes.
	*
	* If these last two properties are provided, less time will be spent
	* calculating them. If they are specified, you can also ommit carddata.
	* This may speed up certain requests, especially with large cards.
	*
	* @param mixed $addressBookId
	* @return array
	*/
	public function getCards($addressBookId)
	{
	console(__METHOD__, $addressBookId);

	// recursively fetch contacts from all folders
	if ($addressBookId == '__all__') {
	$cards = array();
	foreach ($this->sources as $id => $source) {
	$cards = array_merge($cards, $this->getCards($id));
	}
	return $cards;
	}

	$groups_support = $this->useragent != 'thunderbird';
	$query = array(array('type', '=', $groups_support ? array('contact','distribution-list') : 'contact'));
	$cards = array();
	if ($storage = $this->get_storage_folder($addressBookId)) {
	foreach ((array)$storage->select($query) as $contact) {
	$cards[] = array(
	'id' => $contact['uid'],
	'uri' => $contact['uid'] . '.vcf',
	'lastmodified' => $contact['changed']->format('U'),
	'etag' => self::_get_etag($contact),
	'size' => $contact['_size'],
	);
	}
	}

	return $cards;
	}

	/**
	* Returns a specfic card.
	*
	* The same set of properties must be returned as with getCards. The only
	* exception is that 'carddata' is absolutely required.
	*
	* @param mixed $addressBookId
	* @param string $cardUri
	* @return array
	*/
	public function getCard($addressBookId, $cardUri)
	{
	console(__METHOD__, $addressBookId, $cardUri);

	$uid = basename($cardUri, '.vcf');

	// search all folders for the given card
	if ($addressBookId == '__all__') {
	$contact = $this->get_card_by_uid($uid, $storage);
	}
	else {
	$storage = $this->get_storage_folder($addressBookId);
	$contact = $storage->get_object($uid);
	}

	if ($contact) {
	return array(
	'id' => $contact['uid'],
	'uri' => $contact['uid'] . '.vcf',
	'lastmodified' => $contact['changed']->format('U'),
	'carddata' => $this->_to_vcard($contact),
	'etag' => self::_get_etag($contact),
	);
	}

	return array();
	}

	/**
	* Creates a new card.
	*
	* The addressbook id will be passed as the first argument. This is the
	* same id as it is returned from the getAddressbooksForUser method.
	*
	* The cardUri is a base uri, and doesn't include the full path. The
	* cardData argument is the vcard body, and is passed as a string.
	*
	* It is possible to return an ETag from this method. This ETag is for the
	* newly created resource, and must be enclosed with double quotes (that
	* is, the string itself must contain the double quotes).
	*
	* You should only return the ETag if you store the carddata as-is. If a
	* subsequent GET request on the same card does not have the same body,
	* byte-by-byte and you did return an ETag here, clients tend to get
	* confused.
	*
	* @param mixed $addressBookId
	* @param string $cardUri
	* @param string $cardData
	* @return string\|null
	*/
	public function createCard($addressBookId, $cardUri, $cardData)
	{
	console(__METHOD__, $addressBookId, $cardUri, $cardData);

	$uid = basename($cardUri, '.vcf');
	$storage = $this->get_storage_folder($addressBookId);
	$object = $this->parse_vcard($cardData, $uid);

	if ($object['uid'] == $uid) {
	$success = $storage->save($object, $object['_type']);
	if (!$success) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error saving contact object to Kolab server"),
	true, false);

	throw new DAV\Exception('Error saving contact card to backend');
	}
	}
	else {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error creating contact object: UID doesn't match object URI"),
	true, false);

	throw new DAV\Exception\NotFound("UID doesn't match object URI");
	}

	// return new Etag
	return $success ? self::_get_etag($object) : null;
	}

	/**
	* Updates a card.
	*
	* The addressbook id will be passed as the first argument. This is the
	* same id as it is returned from the getAddressbooksForUser method.
	*
	* The cardUri is a base uri, and doesn't include the full path. The
	* cardData argument is the vcard body, and is passed as a string.
	*
	* It is possible to return an ETag from this method. This ETag should
	* match that of the updated resource, and must be enclosed with double
	* quotes (that is: the string itself must contain the actual quotes).
	*
	* If you don't return an ETag, you can just return null.
	*
	* @param mixed $addressBookId
	* @param string $cardUri
	* @param string $cardData
	* @return string\|null
	*/
	public function updateCard($addressBookId, $cardUri, $cardData)
	{
	console(__METHOD__, $addressBookId, $cardUri, $cardData);

	$uid = basename($cardUri, '.vcf');
	$object = $this->parse_vcard($cardData, $uid);

	// sanity check
	if ($object['uid'] != $uid) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error creating contact object: UID doesn't match object URI"),
	true, false);

	throw new DAV\Exception\NotFound("UID doesn't match object URI");
	}

	if ($addressBookId == '__all__') {
	$old = $this->get_card_by_uid($uid, $storage);
	}
	else {
	if ($storage = $this->get_storage_folder($addressBookId))
	$old = $storage->get_object($uid);
	}

	if (!$storage) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Unable to find storage folder for contact $addressBookId/$cardUri"),
	true, false);

	throw new DAV\Exception\NotFound("Invalid address book URI");
	}

	if (!$this->is_writeable($storage)) {
	throw new DAV\Exception\Forbidden('Insufficient privileges to update this card');
	}

	// copy meta data (starting with _) from old object
	foreach ((array)$old as $key => $val) {
	if (!isset($object[$key]) && $key[0] == '_')
	$object[$key] = $val;
	}

	// save object
	$saved = $storage->save($object, $object['_type'], $uid);
	if (!$saved) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error saving contact object to Kolab server"),
	true, false);

	throw new DAV\Exception('Error saving contact card to backend');
	}

	// return new Etag
	return self::_get_etag($object);
	}

	/**
	* Deletes a card
	*
	* @param mixed $addressBookId
	* @param string $cardUri
	* @return bool
	*/
	public function deleteCard($addressBookId, $cardUri)
	{
	console(__METHOD__, $addressBookId, $cardUri);

	$uid = basename($cardUri, '.vcf');

	if ($addressBookId == '__all__') {
	$this->get_card_by_uid($uid, $storage);
	}
	else {
	$storage = $this->get_storage_folder($addressBookId);
	}

	if (!$storage \|\| !$this->is_writeable($storage)) {
	throw new DAV\Exception\MethodNotAllowed('Insufficient privileges to delete this card');
	}

	if ($storage) {
	return $storage->delete($uid);
	}

	return false;
	}


	/**
	* Set User-Agent string of the connected client
	*/
	public function setUserAgent($uastring)
	{
	$ua_classes = array(
	'thunderbird' => 'Thunderbird/\d',
	'macosx' => '(Mac OS X/.+)?AddressBook/\d(.+\sCardDAVPlugin)?',
	);

	foreach ($ua_classes as $class => $regex) {
	if (preg_match("!$regex!", $uastring)) {
	$this->useragent = $class;
	break;
	}
	}
	}


	/**
	* Find an object and the containing folder by UID
	*
	* @param string Object UID
	* @param object Return parameter for the kolab_storage_folder instance
	* @return array\|false
	*/
	private function get_card_by_uid($uid, &$storage)
	{
	$obj = kolab_storage::get_object($uid, 'contact');
	if ($obj) {
	$storage = kolab_storage::get_folder($obj['_mailbox']);
	return $obj;
	}

	return false;
	}

	/**
	* Internal helper method to determine whether the given kolab_storage_folder is writeable
	*
	*/
	private function is_writeable($storage)
	{
	$rights = $storage->get_myrights();
	return (strpos($rights, 'i') !== false \|\| $storage->get_namespace() == 'personal');
	}


	/******** Data conversion utilities *********/

	private $phonetypes = array(
	'main' => 'voice',
	'homefax' => 'fax',
	'workfax' => 'fax',
	'mobile' => 'cell',
	'other' => 'textphone',
	);

	private $improtocols = array(
	'jabber' => 'xmpp',
	);


	/**
	* Parse the given VCard string into a hash array kolab_format_contact can handle
	*
	* @param string VCard data block
	* @return array Hash array with contact properties or null on failure
	*/
	private function parse_vcard($cardData, $uid)
	{
	try {
	// use already parsed object
	if (Plugin::$parsed_vcard && Plugin::$parsed_vcard->UID == $uid) {
	$vobject = Plugin::$parsed_vcard;
	}
	else {
	VObject\Property::$classMap['REV'] = 'Sabre\\VObject\\Property\\DateTime';
	$vobject = VObject\Reader::read($cardData, VObject\Reader::OPTION_FORGIVING \| VObject\Reader::OPTION_IGNORE_INVALID_LINES);
	}

	if ($vobject && $vobject->name == 'VCARD') {
	$contact = $this->_to_array($vobject);
	if (!empty($contact['uid'])) {
	return $contact;
	}
	}
	}
	catch (VObject\ParseException $e) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "VCard data parse error: " . $e->getMessage()),
	true, false);
	}

	return null;
	}


	/**
	* Build a valid VCard format block from the given contact record
	*
	* @param array Hash array with contact properties from libkolab
	* @return string VCARD string containing the contact data
	*/
	private function _to_vcard($contact)
	{
	$vc = VObject\Component::create('VCARD');
	$vc->version = '3.0';
	$vc->prodid = '-//Kolab DAV Server ' .KOLAB_DAV_VERSION . '//Sabre//Sabre VObject ' . CardDAV\Version::VERSION . '//EN';

	$vc->add('UID', $contact['uid']);
	$vc->add('FN', $contact['name']);

	// distlists are KIND:group
	if ($contact['_type'] == 'distribution-list') {
	// group cards are actually vcard version 4
	if ($this->useragent != 'macosx')
	$vc->version = '4.0';

	// prefix group properties for Apple
	$prop_prefix = $this->useragent == 'macosx' ? 'X-ADDRESSBOOKSERVER-' : '';
	$vc->add($prop_prefix . 'KIND', 'group');

	foreach ((array)$contact['member'] as $member) {
	if ($member['uid'])
	$value = 'urn:uuid:' . $member['uid'];
	else if ($member['email'] && $member['name'])
	$value = urlencode(sprintf('mailto:"%s" <%s>', addcslashes($member['name'], '"'), $member['email']));
	else if ($member['email'])
	$value = urlencode('mailto:' . $member['email']);
	$vc->add($prop_prefix . 'MEMBER', $value);
	}
	}
	else {
	$n = VObject\Property::create('N');
	$n->setParts(array($contact['surname'], $contact['firstname'], $contact['middlename'], $contact['prefix'], $contact['suffix']));
	$vc->add($n);
	}

	if (!empty($contact['nickname']))
	$vc->add('NICKNAME', $contact['nickname']);
	if (!empty($contact['jobtitle']))
	$vc->add('TITLE', $contact['jobtitle']);
	if (!empty($contact['profession']))
	$vc->add('X-PROFESSION', $contact['profession']);

	if (!empty($contact['organization']) \|\| !empty($contact['department'])) {
	$org = VObject\Property::create('ORG');
	$org->setParts(array($contact['organization'], $contact['department']));
	$vc->add($org);
	}

	// TODO: save as RELATED
	if (!empty($contact['assistant']))
	$vc->add('X-ASSISTANT', join(',', (array)$contact['assistant']));
	if (!empty($contact['manager']))
	$vc->add('X-MANAGER', join(',', (array)$contact['manager']));
	if (!empty($contact['spouse']))
	$vc->add('X-SPOUSE', $contact['spouse']);
	if (!empty($contact['children']))
	$vc->add('X-CHILDREN', join(',', (array)$contact['children']));

	foreach ((array)$contact['email'] as $email) {
	$vc->add('EMAIL', $email['address'], array('type' => rtrim('INTERNET,' . strtoupper($email['type']), ',')));
	}

	foreach ((array)$contact['phone'] as $phone) {
	$type = $this->phonetypes[$phone['type']] ?: $phone['type'];
	$vc->add('TEL', $phone['number'], array('type' => strtoupper($type)));
	}

	foreach ((array)$contact['website'] as $website) {
	$vc->add('URL', $website['url'], array('type' => strtoupper($website['type'])));
	}

	$improtocolmap = array_flip($this->improtocols);
	foreach ((array)$contact['im'] as $im) {
	list($prot, $val) = explode(':', $im);
	if ($val) $vc->add('x-' . ($improtocolmap[$prot] ?: $prot), $val);
	else $vc->add('IMPP', $im);
	}

	foreach ((array)$contact['address'] as $adr) {
	$vadr = VObject\Property::create('ADR', null, array('type' => strtoupper($adr['type'])));
	$vadr->setParts(array('','', $adr['street'], $adr['locality'], $adr['region'], $adr['code'], $adr['country']));
	$vc->add($vadr);
	}

	if (!empty($contact['notes']))
	$vc->add('NOTE', $contact['notes']);

	if (!empty($contact['gender']))
	$vc->add('SEX', $contact['gender']);

	if (!empty($contact['birthday']) && $contact['birthday'] instanceof \DateTime) {
	// FIXME: Date values are ignored by Thunderbird
	$contact['birthday']->_dateonly = true;
	$vc->add(VObjectUtils::datetime_prop('BDAY', $contact['birthday'], false));
	}
	if (!empty($contact['anniversary']) && $contact['birthday'] instanceof \DateTime) {
	$contact['anniversary']->_dateonly = true;
	$vc->add(VObjectUtils::datetime_prop('ANNIVERSARY', $contact['anniversary'], false));
	}

	if (!empty($contact['categories'])) {
	$cat = VObject\Property::create('CATEGORIES');
	$cat->setParts((array)$contact['categories']);
	$vc->add($cat);
	}

	if (!empty($contact['freebusyurl']))
	$vc->add('FBURL', $contact['freebusyurl']);

	if (!empty($contact['photo'])) {
	$vc->PHOTO = base64_encode($contact['photo']);
	$vc->PHOTO->add('BASE64', null);
	}

	// add custom properties
	foreach ((array)$contact['x-custom'] as $prop) {
	$vc->add($prop[0], $prop[1]);
	}

	if (!empty($contact['changed']))
	$vc->add(VObjectUtils::datetime_prop('REV', $contact['changed'], true));

	return $vc->serialize();
	}

	/**
	* Convert the given Sabre\VObject\Component\Vcard object to a libkolab compatible contact format
	*
	* @param object Vcard object to convert
	* @return array Hash array with contact properties
	*/
	private function _to_array($vc)
	{
	$contact = array(
	'uid' => strval($vc->UID),
	'name' => strval($vc->FN),
	'_type' => 'contact',
	);

	if ($vc->REV) {
	try { $contact['changed'] = $vc->REV->getDateTime(); }
	catch (\Exception $e) {
	try { $contact['changed'] = new \DateTime(strval($vc->REV)); }
	catch (\Exception $e) { }
	}
	}

	$phonetypemap = array_flip($this->phonetypes);

	// map attributes to internal fields
	foreach ($vc->children as $prop) {
	if (!($prop instanceof VObject\Property))
	continue;

	switch ($prop->name) {
	case 'N':
	list($contact['surname'], $contact['firstname'], $contact['middlename'], $contact['prefix'], $contact['suffix']) = $prop->getParts();
	break;

	case 'NOTE':
	$contact['notes'] = $prop->value;
	break;

	case 'TITLE':
	case 'NICKNAME':
	$contact[strtolower($prop->name)] = $prop->value;
	break;

	case 'ORG':
	list($contact['organization'], $contact['department']) = $prop->getParts();
	break;

	case 'CATEGORY':
	case 'CATEGORIES':
	$contact['categories'] = $prop->getParts();
	break;

	case 'EMAIL':
	$types = array_values(self::array_filter($prop->offsetGet('type'), 'internet,pref', true));
	$contact['email'][] = array('address' => $prop->value, 'type' => strtolower($types[0] ?: 'other'));
	break;

	case 'URL':
	$types = array_values(self::array_filter($prop->offsetGet('type'), 'internet,pref', true));
	$contact['website'][] = array('url' => $prop->value, 'type' => strtolower($types[0]));
	break;

	case 'TEL':
	$types = array_values(self::array_filter($prop->offsetGet('type'), 'internet,pref', true));
	$type = strtolower($types[0]);
	$contact['phone'][] = array('number' => $prop->value, 'type' => $phonetypemap[$type] ?: $type);
	break;

	case 'ADR':
	$type = $prop->offsetGet('type');
	$adr = array('type' => strtolower($type));
	list(,, $adr['street'], $adr['locality'], $adr['region'], $adr['code'], $adr['country']) = $prop->getParts();
	$contact['address'][] = $adr;
	break;

	case 'BDAY':
	$contact['birthday'] = new \DateTime($prop->value);
	$contact['birthday']->_dateonly = true;
	break;

	case 'ANNIVERSARY':
	case 'X-ANNIVERSARY':
	$contact['anniversary'] = new \DateTime($prop->value);
	$contact['anniversary']->_dateonly = true;
	break;

	case 'SEX':
	case 'X-GENDER':
	$contact['gender'] = $prop->value;
	break;

	case 'X-PROFESSION':
	case 'X-SPOUSE':
	$contact[strtolower(substr($prop->name, 2))] = $prop->value;
	break;

	case 'X-MANAGER':
	case 'X-ASSISTANT':
	case 'X-CHILDREN':
	$contact[strtolower(substr($prop->name, 2))] = explode(',', $prop->value);
	break;

	case 'X-JABBER':
	case 'X-ICQ':
	case 'X-MSN':
	case 'X-AIM':
	case 'X-YAHOO':
	case 'X-SKYPE':
	$protocol = strtolower(substr($prop->name, 2));
	$contact['im'][] = ($this->improtocols[$protocol] ?: $protocol) . ':' . preg_replace('/^[a-z]+:/i', '', $prop->value);
	break;

	case 'IMPP':
	$type = strtolower((string)$prop->offsetGet('X-SERVICE-TYPE'));
	$protocol = $type && !preg_match('/^[a-z]+:/i', $prop->value) ? ($this->improtocols[$type] ?: $type) . ':' : '';
	$contact['im'][] = $protocol . urldecode($prop->value);
	break;

	case 'PHOTO':
	$param = $prop->parameters[0];
	if ($param->value && strtolower($param->value) == 'b' \|\| strtolower($param->name) == 'base64') {
	$contact['photo'] = base64_decode($prop->value);
	}
	break;

	case 'KIND':
	case 'X-ADDRESSBOOKSERVER-KIND':
	if (strtolower($prop->value) == 'group') {
	$contact['_type'] = 'distribution-list';
	}
	break;

	case 'MEMBER':
	case 'X-ADDRESSBOOKSERVER-MEMBER':
	if (strpos($prop->value, 'urn:uuid:') === 0) {
	$contact['member'][] = array('uid' => substr($prop->value, 9));
	}
	else if (strpos($prop->value, 'mailto:') === 0) {
	$member = reset(\rcube_mime::parse_address_list(urldecode(substr($prop->value, 7))));
	if ($member['address'])
	$contact['member'][] = array('email' => $member['address'], 'name' => $member['name']);
	}
	break;

	case 'CUSTOM1':
	case 'CUSTOM2':
	case 'CUSTOM3':
	case 'CUSTOM4':
	default:
	if (substr($prop->name, 0, 2) == 'X-' \|\| substr($prop->name, 0, 6) == 'CUSTOM')
	$contact['x-custom'][] = array($prop->name, strval($prop->value));
	break;
	}
	}

	if (is_array($contact['im']))
	$contact['im'] = array_unique($contact['im']);

	return $contact;
	}

	/**
	* Extract array values by a filter
	*
	* @param array Array to filter
	* @param keys Array or comma separated list of values to keep
	* @param boolean Invert key selection: remove the listed values
	*
	* @return array The filtered array
	*/
	private static function array_filter($arr, $values, $inverse = false)
	{
	if (!is_array($values)) {
	$values = explode(',', $values);
	}

	$result = array();
	$keep = array_flip((array)$values);

	if (!empty($arr)) {
	foreach ($arr as $key => $val) {
	if ($inverse != isset($keep[strtolower($val)])) {
	$result[$key] = $val;
	}
	}
	}

	return $result;
	}

	/**
	* Generate an Etag string from the given contact data
	*
	* @param array Hash array with contact properties from libkolab
	* @return string Etag string
	*/
	private static function _get_etag($contact)
	{
	return sprintf('"%s-%d"', substr(md5($contact['uid']), 0, 16), $contact['_msguid']);
	}

	}

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