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<?php
namespace RobThree\Auth\Providers\Time;
/**
* Takes the time from any webserver by doing a HEAD request on the specified URL and extracting the 'Date:' header
*/
class HttpTimeProvider implements ITimeProvider
{
public $url;
public $options;
public $expectedtimeformat;
function __construct($url = 'https://google.com', $expectedtimeformat = 'D, d M Y H:i:s O+', array $options = null)
{
$this->url = $url;
$this->expectedtimeformat = $expectedtimeformat;
$this->options = $options;
if ($this->options === null) {
$this->options = array(
'http' => array(
'method' => 'HEAD',
'follow_location' => false,
'ignore_errors' => true,
'max_redirects' => 0,
'request_fulluri' => true,
'header' => array(
'Connection: close',
'User-agent: TwoFactorAuth HttpTimeProvider (https://github.com/RobThree/TwoFactorAuth)'
)
)
);
}
}
public function getTime() {
try {
$context = stream_context_create($this->options);
$fd = fopen($this->url, 'rb', false, $context);
$headers = stream_get_meta_data($fd);
fclose($fd);
foreach ($headers['wrapper_data'] as $h) {
if (strcasecmp(substr($h, 0, 5), 'Date:') === 0)
return \DateTime::createFromFormat($this->expectedtimeformat, trim(substr($h,5)))->getTimestamp();
}
throw new \TimeException(sprintf('Unable to retrieve time from %s (Invalid or no "Date:" header found)', $this->url));
}
catch (Exception $ex) {
throw new \TimeException(sprintf('Unable to retrieve time from %s (%s)', $this->url, $ex->getMessage()));
}
}
}
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