nextcloud/apps/dav/lib/CardDAV/SyncService.php

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<?php
/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
*
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* @author Björn Schießle <bjoern@schiessle.org>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @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\CardDAV;
use OC\Accounts\AccountManager;
use OCP\AppFramework\Http;
use OCP\ILogger;
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use OCP\IUser;
use OCP\IUserManager;
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use Sabre\DAV\Client;
use Sabre\DAV\Xml\Response\MultiStatus;
use Sabre\DAV\Xml\Service;
use Sabre\HTTP\ClientHttpException;
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use Sabre\VObject\Reader;
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class SyncService {
/** @var CardDavBackend */
private $backend;
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/** @var IUserManager */
private $userManager;
/** @var ILogger */
private $logger;
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/** @var array */
private $localSystemAddressBook;
/** @var AccountManager */
private $accountManager;
/** @var string */
protected $certPath;
/**
* SyncService constructor.
*
* @param CardDavBackend $backend
* @param IUserManager $userManager
* @param ILogger $logger
* @param AccountManager $accountManager
*/
public function __construct(CardDavBackend $backend, IUserManager $userManager, ILogger $logger, AccountManager $accountManager) {
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$this->backend = $backend;
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$this->userManager = $userManager;
$this->logger = $logger;
$this->accountManager = $accountManager;
$certManager = \OC::$server->getCertificateManager(null);
$certPath = $certManager->getAbsoluteBundlePath();
if (file_exists($certPath)) {
$this->certPath = $certPath;
}
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}
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/**
* @param string $url
* @param string $userName
* @param string $sharedSecret
* @param string $syncToken
* @param int $targetBookId
* @param string $targetPrincipal
* @param array $targetProperties
* @return string
* @throws \Exception
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*/
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public function syncRemoteAddressBook($url, $userName, $sharedSecret, $syncToken, $targetBookId, $targetPrincipal, $targetProperties) {
// 1. create addressbook
$book = $this->ensureSystemAddressBookExists($targetPrincipal, $targetBookId, $targetProperties);
$addressBookId = $book['id'];
// 2. query changes
try {
$response = $this->requestSyncReport($url, $userName, $sharedSecret, $syncToken);
} catch (ClientHttpException $ex) {
if ($ex->getCode() === Http::STATUS_UNAUTHORIZED) {
// remote server revoked access to the address book, remove it
$this->backend->deleteAddressBook($addressBookId);
$this->logger->info('Authorization failed, remove address book: ' . $url, ['app' => 'dav']);
throw $ex;
}
}
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// 3. apply changes
// TODO: use multi-get for download
foreach ($response['response'] as $resource => $status) {
$cardUri = basename($resource);
if (isset($status[200])) {
$vCard = $this->download($url, $sharedSecret, $resource);
$existingCard = $this->backend->getCard($addressBookId, $cardUri);
if ($existingCard === false) {
$this->backend->createCard($addressBookId, $cardUri, $vCard['body']);
} else {
$this->backend->updateCard($addressBookId, $cardUri, $vCard['body']);
}
} else {
$this->backend->deleteCard($addressBookId, $cardUri);
}
}
return $response['token'];
}
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/**
* @param string $principal
* @param string $id
* @param array $properties
* @return array|null
* @throws \Sabre\DAV\Exception\BadRequest
*/
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public function ensureSystemAddressBookExists($principal, $id, $properties) {
$book = $this->backend->getAddressBooksByUri($principal, $id);
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if (!is_null($book)) {
return $book;
}
$this->backend->createAddressBook($principal, $id, $properties);
return $this->backend->getAddressBooksByUri($principal, $id);
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}
/**
* @param string $url
* @param string $userName
* @param string $sharedSecret
* @return Client
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*/
protected function getClient($url, $userName, $sharedSecret) {
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$settings = [
'baseUri' => $url . '/',
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'userName' => $userName,
'password' => $sharedSecret,
];
$client = new Client($settings);
$client->setThrowExceptions(true);
if (strpos($url, 'http://') !== 0 && $this->certPath) {
$client->addCurlSetting(CURLOPT_CAINFO, $this->certPath);
}
return $client;
}
/**
* @param string $url
* @param string $userName
* @param string $sharedSecret
* @param string $syncToken
* @return array
*/
protected function requestSyncReport($url, $userName, $sharedSecret, $syncToken) {
$client = $this->getClient($url, $userName, $sharedSecret);
$addressBookUrl = "remote.php/dav/addressbooks/system/system/system";
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$body = $this->buildSyncCollectionRequestBody($syncToken);
$response = $client->request('REPORT', $addressBookUrl, $body, [
'Content-Type' => 'application/xml'
]);
return $this->parseMultiStatus($response['body']);
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}
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/**
* @param string $url
* @param string $sharedSecret
* @param string $resourcePath
* @return array
*/
protected function download($url, $sharedSecret, $resourcePath) {
$client = $this->getClient($url, 'system', $sharedSecret);
return $client->request('GET', $resourcePath);
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}
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/**
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* @param string|null $syncToken
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* @return string
*/
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private function buildSyncCollectionRequestBody($syncToken) {
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$dom = new \DOMDocument('1.0', 'UTF-8');
$dom->formatOutput = true;
$root = $dom->createElementNS('DAV:', 'd:sync-collection');
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$sync = $dom->createElement('d:sync-token', $syncToken);
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$prop = $dom->createElement('d:prop');
$cont = $dom->createElement('d:getcontenttype');
$etag = $dom->createElement('d:getetag');
$prop->appendChild($cont);
$prop->appendChild($etag);
$root->appendChild($sync);
$root->appendChild($prop);
$dom->appendChild($root);
$body = $dom->saveXML();
return $body;
}
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/**
* @param string $body
* @return array
* @throws \Sabre\Xml\ParseException
*/
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private function parseMultiStatus($body) {
$xml = new Service();
/** @var MultiStatus $multiStatus */
$multiStatus = $xml->expect('{DAV:}multistatus', $body);
$result = [];
foreach ($multiStatus->getResponses() as $response) {
$result[$response->getHref()] = $response->getResponseProperties();
}
return ['response' => $result, 'token' => $multiStatus->getSyncToken()];
}
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/**
* @param IUser $user
*/
public function updateUser($user) {
$systemAddressBook = $this->getLocalSystemAddressBook();
$addressBookId = $systemAddressBook['id'];
$converter = new Converter($this->accountManager);
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$name = $user->getBackendClassName();
$userId = $user->getUID();
$cardId = "$name:$userId.vcf";
$card = $this->backend->getCard($addressBookId, $cardId);
if ($card === false) {
$vCard = $converter->createCardFromUser($user);
if ($vCard !== null) {
$this->backend->createCard($addressBookId, $cardId, $vCard->serialize());
}
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} else {
$vCard = $converter->createCardFromUser($user);
if (is_null($vCard)) {
$this->backend->deleteCard($addressBookId, $cardId);
} else {
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$this->backend->updateCard($addressBookId, $cardId, $vCard->serialize());
}
}
}
/**
* @param IUser|string $userOrCardId
*/
public function deleteUser($userOrCardId) {
$systemAddressBook = $this->getLocalSystemAddressBook();
if ($userOrCardId instanceof IUser){
$name = $userOrCardId->getBackendClassName();
$userId = $userOrCardId->getUID();
$userOrCardId = "$name:$userId.vcf";
}
$this->backend->deleteCard($systemAddressBook['id'], $userOrCardId);
}
/**
* @return array|null
*/
public function getLocalSystemAddressBook() {
if (is_null($this->localSystemAddressBook)) {
$systemPrincipal = "principals/system/system";
$this->localSystemAddressBook = $this->ensureSystemAddressBookExists($systemPrincipal, 'system', [
'{' . Plugin::NS_CARDDAV . '}addressbook-description' => 'System addressbook which holds all users of this instance'
]);
}
return $this->localSystemAddressBook;
}
public function syncInstance(\Closure $progressCallback = null) {
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$systemAddressBook = $this->getLocalSystemAddressBook();
$this->userManager->callForAllUsers(function($user) use ($systemAddressBook, $progressCallback) {
$this->updateUser($user);
if (!is_null($progressCallback)) {
$progressCallback();
}
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});
// remove no longer existing
$allCards = $this->backend->getCards($systemAddressBook['id']);
foreach($allCards as $card) {
$vCard = Reader::read($card['carddata']);
$uid = $vCard->UID->getValue();
// load backend and see if user exists
if (!$this->userManager->userExists($uid)) {
$this->deleteUser($card['uri']);
}
}
}
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}