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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
* @copyright Copyright (c) 2016, Georg Ehrke
*
* @author Achim Königs <garfonso@tratschtante.de>
* @author Georg Ehrke <oc.list@georgehrke.com>
* @author Joas Schilling <coding@schilljs.com>
* @author Robin Appelman <robin@icewind.nl>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\DAV\CalDAV;
use Exception;
use OCA\DAV\CardDAV\CardDavBackend;
use OCA\DAV\DAV\GroupPrincipalBackend;
use OCP\IConfig;
use Sabre\VObject\Component\VCalendar;
use Sabre\VObject\Component\VCard;
use Sabre\VObject\DateTimeParser;
use Sabre\VObject\Document;
use Sabre\VObject\InvalidDataException;
use Sabre\VObject\Property\VCard\DateAndOrTime;
use Sabre\VObject\Reader;
class BirthdayService {
const BIRTHDAY_CALENDAR_URI = 'contact_birthdays';
/** @var GroupPrincipalBackend */
private $principalBackend;
/** @var CalDavBackend */
private $calDavBackEnd;
/** @var CardDavBackend */
private $cardDavBackEnd;
/** @var IConfig */
private $config;
/**
* BirthdayService constructor.
*
* @param CalDavBackend $calDavBackEnd
* @param CardDavBackend $cardDavBackEnd
* @param GroupPrincipalBackend $principalBackend
* @param IConfig $config;
*/
public function __construct(CalDavBackend $calDavBackEnd, CardDavBackend $cardDavBackEnd, GroupPrincipalBackend $principalBackend, IConfig $config) {
$this->calDavBackEnd = $calDavBackEnd;
$this->cardDavBackEnd = $cardDavBackEnd;
$this->principalBackend = $principalBackend;
$this->config = $config;
}
/**
* @param int $addressBookId
* @param string $cardUri
* @param string $cardData
*/
public function onCardChanged($addressBookId, $cardUri, $cardData) {
if (!$this->isGloballyEnabled()) {
return;
}
$targetPrincipals = $this->getAllAffectedPrincipals($addressBookId);
$book = $this->cardDavBackEnd->getAddressBookById($addressBookId);
$targetPrincipals[] = $book['principaluri'];
$datesToSync = [
['postfix' => '', 'field' => 'BDAY', 'symbol' => '*'],
['postfix' => '-death', 'field' => 'DEATHDATE', 'symbol' => "†"],
['postfix' => '-anniversary', 'field' => 'ANNIVERSARY', 'symbol' => "âš"],
];
foreach ($targetPrincipals as $principalUri) {
if (!$this->isUserEnabled($principalUri)) {
continue;
}
$calendar = $this->ensureCalendarExists($principalUri);
foreach ($datesToSync as $type) {
$this->updateCalendar($cardUri, $cardData, $book, $calendar['id'], $type);
}
}
}
/**
* @param int $addressBookId
* @param string $cardUri
*/
public function onCardDeleted($addressBookId, $cardUri) {
if (!$this->isGloballyEnabled()) {
return;
}
$targetPrincipals = $this->getAllAffectedPrincipals($addressBookId);
$book = $this->cardDavBackEnd->getAddressBookById($addressBookId);
$targetPrincipals[] = $book['principaluri'];
foreach ($targetPrincipals as $principalUri) {
if (!$this->isUserEnabled($principalUri)) {
continue;
}
$calendar = $this->ensureCalendarExists($principalUri);
foreach (['', '-death', '-anniversary'] as $tag) {
$objectUri = $book['uri'] . '-' . $cardUri . $tag .'.ics';
$this->calDavBackEnd->deleteCalendarObject($calendar['id'], $objectUri);
}
}
}
/**
* @param string $principal
* @return array|null
* @throws \Sabre\DAV\Exception\BadRequest
*/
public function ensureCalendarExists($principal) {
$book = $this->calDavBackEnd->getCalendarByUri($principal, self::BIRTHDAY_CALENDAR_URI);
if (!is_null($book)) {
return $book;
}
$this->calDavBackEnd->createCalendar($principal, self::BIRTHDAY_CALENDAR_URI, [
'{DAV:}displayname' => 'Contact birthdays',
'{http://apple.com/ns/ical/}calendar-color' => '#FFFFCA',
'components' => 'VEVENT',
]);
return $this->calDavBackEnd->getCalendarByUri($principal, self::BIRTHDAY_CALENDAR_URI);
}
/**
* @param string $cardData
* @param string $dateField
* @param string $postfix
* @param string $summarySymbol
* @return null|VCalendar
*/
public function buildDateFromContact($cardData, $dateField, $postfix, $summarySymbol) {
if (empty($cardData)) {
return null;
}
try {
$doc = Reader::read($cardData);
// We're always converting to vCard 4.0 so we can rely on the
// VCardConverter handling the X-APPLE-OMIT-YEAR property for us.
if (!$doc instanceof VCard) {
return null;
}
$doc = $doc->convert(Document::VCARD40);
} catch (Exception $e) {
return null;
}
if (!isset($doc->{$dateField})) {
return null;
}
if (!isset($doc->FN)) {
return null;
}
$birthday = $doc->{$dateField};
if (!(string)$birthday) {
return null;
}
// Skip if the BDAY property is not of the right type.
if (!$birthday instanceof DateAndOrTime) {
return null;
}
// Skip if we can't parse the BDAY value.
try {
$dateParts = DateTimeParser::parseVCardDateTime($birthday->getValue());
} catch (InvalidDataException $e) {
return null;
}
$unknownYear = false;
if (!$dateParts['year']) {
$birthday = '1900-' . $dateParts['month'] . '-' . $dateParts['date'];
$unknownYear = true;
}
try {
$date = new \DateTime($birthday);
} catch (Exception $e) {
return null;
}
if ($unknownYear) {
$summary = $doc->FN->getValue() . ' ' . $summarySymbol;
} else {
$year = (int)$date->format('Y');
$summary = $doc->FN->getValue() . " ($summarySymbol$year)";
}
$vCal = new VCalendar();
$vCal->VERSION = '2.0';
$vEvent = $vCal->createComponent('VEVENT');
$vEvent->add('DTSTART');
$vEvent->DTSTART->setDateTime(
$date
);
$vEvent->DTSTART['VALUE'] = 'DATE';
$vEvent->add('DTEND');
$date->add(new \DateInterval('P1D'));
$vEvent->DTEND->setDateTime(
$date
);
$vEvent->DTEND['VALUE'] = 'DATE';
$vEvent->{'UID'} = $doc->UID . $postfix;
$vEvent->{'RRULE'} = 'FREQ=YEARLY';
$vEvent->{'SUMMARY'} = $summary;
$vEvent->{'TRANSP'} = 'TRANSPARENT';
$alarm = $vCal->createComponent('VALARM');
$alarm->add($vCal->createProperty('TRIGGER', '-PT0M', ['VALUE' => 'DURATION']));
$alarm->add($vCal->createProperty('ACTION', 'DISPLAY'));
$alarm->add($vCal->createProperty('DESCRIPTION', $vEvent->{'SUMMARY'}));
$vEvent->add($alarm);
$vCal->add($vEvent);
return $vCal;
}
/**
* @param string $user
*/
public function syncUser($user) {
$principal = 'principals/users/'.$user;
$this->ensureCalendarExists($principal);
$books = $this->cardDavBackEnd->getAddressBooksForUser($principal);
foreach($books as $book) {
$cards = $this->cardDavBackEnd->getCards($book['id']);
foreach($cards as $card) {
$this->onCardChanged($book['id'], $card['uri'], $card['carddata']);
}
}
}
/**
* @param string $existingCalendarData
* @param VCalendar $newCalendarData
* @return bool
*/
public function birthdayEvenChanged($existingCalendarData, $newCalendarData) {
try {
$existingBirthday = Reader::read($existingCalendarData);
} catch (Exception $ex) {
return true;
}
if ($newCalendarData->VEVENT->DTSTART->getValue() !== $existingBirthday->VEVENT->DTSTART->getValue() ||
$newCalendarData->VEVENT->SUMMARY->getValue() !== $existingBirthday->VEVENT->SUMMARY->getValue()
) {
return true;
}
return false;
}
/**
* @param integer $addressBookId
* @return mixed
*/
protected function getAllAffectedPrincipals($addressBookId) {
$targetPrincipals = [];
$shares = $this->cardDavBackEnd->getShares($addressBookId);
foreach ($shares as $share) {
if ($share['{http://owncloud.org/ns}group-share']) {
$users = $this->principalBackend->getGroupMemberSet($share['{http://owncloud.org/ns}principal']);
foreach ($users as $user) {
$targetPrincipals[] = $user['uri'];
}
} else {
$targetPrincipals[] = $share['{http://owncloud.org/ns}principal'];
}
}
return array_values(array_unique($targetPrincipals, SORT_STRING));
}
/**
* @param string $cardUri
* @param string $cardData
* @param array $book
* @param int $calendarId
* @param string[] $type
*/
private function updateCalendar($cardUri, $cardData, $book, $calendarId, $type) {
$objectUri = $book['uri'] . '-' . $cardUri . $type['postfix'] . '.ics';
$calendarData = $this->buildDateFromContact($cardData, $type['field'], $type['postfix'], $type['symbol']);
$existing = $this->calDavBackEnd->getCalendarObject($calendarId, $objectUri);
if (is_null($calendarData)) {
if (!is_null($existing)) {
$this->calDavBackEnd->deleteCalendarObject($calendarId, $objectUri);
}
} else {
if (is_null($existing)) {
$this->calDavBackEnd->createCalendarObject($calendarId, $objectUri, $calendarData->serialize());
} else {
if ($this->birthdayEvenChanged($existing['calendardata'], $calendarData)) {
$this->calDavBackEnd->updateCalendarObject($calendarId, $objectUri, $calendarData->serialize());
}
}
}
}
/**
* checks if the admin opted-out of birthday calendars
*
* @return bool
*/
private function isGloballyEnabled() {
$isGloballyEnabled = $this->config->getAppValue('dav', 'generateBirthdayCalendar', 'yes');
return $isGloballyEnabled === 'yes';
}
/**
* checks if the user opted-out of birthday calendars
*
* @param $userPrincipal
* @return bool
*/
private function isUserEnabled($userPrincipal) {
if (strpos($userPrincipal, 'principals/users/') === 0) {
$userId = substr($userPrincipal, 17);
$isEnabled = $this->config->getUserValue($userId, 'dav', 'generateBirthdayCalendar', 'yes');
return $isEnabled === 'yes';
}
// not sure how we got here, just be on the safe side and return true
return true;
}
}