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<?php |
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/** |
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* @author Christoph Wurst <[email protected]> |
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* |
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* ownCloud - Mail |
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* |
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* This code is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License, version 3, |
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* as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License, version 3, |
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* along with this program. If not, see <http://www.gnu.org/licenses/> |
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* |
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*/ |
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namespace OCA\Mail\Service\AutoConfig; |
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use Exception; |
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use OCA\Mail\Service\Logger; |
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use OCP\Http\Client\IClientService; |
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class IspDb { |
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/** @var Logger */ |
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private $logger; |
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/** @var IClientService */ |
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private $clientService; |
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/** @var string[] */ |
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private $urls = [ |
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'https://autoconfig.{DOMAIN}/mail/config-v1.1.xml', |
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'https://{DOMAIN}/.well-known/autoconfig/mail/config-v1.1.xml', |
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'https://autoconfig.thunderbird.net/v1.1/{DOMAIN}', |
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]; |
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/** |
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* @param Logger $logger |
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* @param string[] $clientService |
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*/ |
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public function __construct(Logger $logger, IClientService $clientService) { |
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$this->logger = $logger; |
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$this->clientService = $clientService; |
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} |
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private function readProviderData($config) { |
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$provider = [ |
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'displayName' => (string) $config->emailProvider->displayName, |
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]; |
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foreach ($config->emailProvider->children() as $tag => $server) { |
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if (!in_array($tag, ['incomingServer', 'outgoingServer'])) { |
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continue; |
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} |
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foreach ($server->attributes() as $name => $value) { |
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if ($name == 'type') { |
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$type = (string) $value; |
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} |
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} |
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$data = []; |
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foreach ($server as $name => $value) { |
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foreach ($value->children() as $tag => $val) { |
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$data[$name][$tag] = (string) $val; |
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} |
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if (!isset($data[$name])) { |
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$data[$name] = (string) $value; |
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} |
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} |
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$provider[$type][] = $data; |
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} |
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return $provider; |
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} |
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private function queryUrl($url) { |
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try { |
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$file = $this->clientService->newClient()->get($url); |
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$config = @simplexml_load_string($file); |
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if (libxml_get_last_error() !== False || !is_object($config) || !$config->emailProvider) { |
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libxml_clear_errors(); |
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return []; |
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} |
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$provider = $this->readProviderData($config); |
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} catch (Exception $e) { |
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// ignore own not-found exception or xml parsing exceptions |
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unset($e); |
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$provider = []; |
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} |
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return $provider; |
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} |
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/** |
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* @param string $domain |
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* @return array |
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*/ |
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public function query($domain, $tryMx = true) { |
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$this->logger->debug("IsbDb: querying <$domain>"); |
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if (strpos($domain, '@') !== false) { |
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// TODO: use horde mail address parsing instead |
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list(, $domain) = explode('@', $domain); |
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} |
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$provider = []; |
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foreach ($this->urls as $url) { |
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$url = str_replace("{DOMAIN}", $domain, $url); |
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$this->logger->debug("IsbDb: querying <$domain> via <$url>"); |
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$provider = $this->queryUrl($url); |
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if (!empty($provider)) { |
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return $provider; |
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} |
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} |
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if ($tryMx && ($dns = dns_get_record($domain, DNS_MX))) { |
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$domain = $dns[0]['target']; |
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if (!($provider = $this->query($domain, false))) { |
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list(, $domain) = explode('.', $domain, 2); |
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$provider = $this->query($domain, false); |
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} |
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} |
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return $provider; |
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} |
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} |
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owncloud /
mail
If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: