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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OCA\DAV\CalDAV\WebcalCaching;
use Exception;
use GuzzleHttp\HandlerStack;
use GuzzleHttp\Middleware;
use OCP\Http\Client\IClientService;
use OCP\Http\Client\LocalServerException;
use OCP\IAppConfig;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Log\LoggerInterface;
use Sabre\DAV\Xml\Property\Href;
use Sabre\VObject\Reader;
class Connection {
public function __construct(private IClientService $clientService,
private IAppConfig $config,
private LoggerInterface $logger) {
}
/**
* gets webcal feed from remote server
*/
public function queryWebcalFeed(array $subscription, array &$mutations): ?string {
$client = $this->clientService->newClient();
$didBreak301Chain = false;
$latestLocation = null;
$handlerStack = HandlerStack::create();
$handlerStack->push(Middleware::mapRequest(function (RequestInterface $request) {
return $request
->withHeader('Accept', 'text/calendar, application/calendar+json, application/calendar+xml')
->withHeader('User-Agent', 'Nextcloud Webcal Service');
}));
$handlerStack->push(Middleware::mapResponse(function (ResponseInterface $response) use (&$didBreak301Chain, &$latestLocation) {
if (!$didBreak301Chain) {
if ($response->getStatusCode() !== 301) {
$didBreak301Chain = true;
} else {
$latestLocation = $response->getHeader('Location');
}
}
return $response;
}));
$allowLocalAccess = $this->config->getValueString('dav', 'webcalAllowLocalAccess', 'no');
$subscriptionId = $subscription['id'];
$url = $this->cleanURL($subscription['source']);
if ($url === null) {
return null;
}
try {
$params = [
'allow_redirects' => [
'redirects' => 10
],
'handler' => $handlerStack,
'nextcloud' => [
'allow_local_address' => $allowLocalAccess === 'yes',
]
];
$user = parse_url($subscription['source'], PHP_URL_USER);
$pass = parse_url($subscription['source'], PHP_URL_PASS);
if ($user !== null && $pass !== null) {
$params['auth'] = [$user, $pass];
}
$response = $client->get($url, $params);
$body = $response->getBody();
if ($latestLocation !== null) {
$mutations['{http://calendarserver.org/ns/}source'] = new Href($latestLocation);
}
$contentType = $response->getHeader('Content-Type');
$contentType = explode(';', $contentType, 2)[0];
switch ($contentType) {
case 'application/calendar+json':
try {
$jCalendar = Reader::readJson($body, Reader::OPTION_FORGIVING);
} catch (Exception $ex) {
// In case of a parsing error return null
$this->logger->warning("Subscription $subscriptionId could not be parsed", ['exception' => $ex]);
return null;
}
return $jCalendar->serialize();
case 'application/calendar+xml':
try {
$xCalendar = Reader::readXML($body);
} catch (Exception $ex) {
// In case of a parsing error return null
$this->logger->warning("Subscription $subscriptionId could not be parsed", ['exception' => $ex]);
return null;
}
return $xCalendar->serialize();
case 'text/calendar':
default:
try {
$vCalendar = Reader::read($body);
} catch (Exception $ex) {
// In case of a parsing error return null
$this->logger->warning("Subscription $subscriptionId could not be parsed", ['exception' => $ex]);
return null;
}
return $vCalendar->serialize();
}
} catch (LocalServerException $ex) {
$this->logger->warning("Subscription $subscriptionId was not refreshed because it violates local access rules", [
'exception' => $ex,
]);
return null;
} catch (Exception $ex) {
$this->logger->warning("Subscription $subscriptionId could not be refreshed due to a network error", [
'exception' => $ex,
]);
return null;
}
}
/**
* This method will strip authentication information and replace the
* 'webcal' or 'webcals' protocol scheme
*
* @param string $url
* @return string|null
*/
private function cleanURL(string $url): ?string {
$parsed = parse_url($url);
if ($parsed === false) {
return null;
}
if (isset($parsed['scheme']) && $parsed['scheme'] === 'http') {
$scheme = 'http';
} else {
$scheme = 'https';
}
$host = $parsed['host'] ?? '';
$port = isset($parsed['port']) ? ':' . $parsed['port'] : '';
$path = $parsed['path'] ?? '';
$query = isset($parsed['query']) ? '?' . $parsed['query'] : '';
$fragment = isset($parsed['fragment']) ? '#' . $parsed['fragment'] : '';
$cleanURL = "$scheme://$host$port$path$query$fragment";
// parse_url is giving some weird results if no url and no :// is given,
// so let's test the url again
$parsedClean = parse_url($cleanURL);
if ($parsedClean === false || !isset($parsedClean['host'])) {
return null;
}
return $cleanURL;
}
}
|
