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<?php namespace RobThree\Auth\Providers\Time; use DateTime; /** * Takes the time from any webserver by doing a HEAD request on the specified URL and extracting the 'Date:' header */ class HttpTimeProvider implements ITimeProvider { /** @var string */ public $url; /** @var string */ public $expectedtimeformat; /** @var array */ public $options; /** * @param string $url * @param string $expectedtimeformat * @param array $options */ public function __construct($url = 'https://google.com', $expectedtimeformat = 'D, d M Y H:i:s O+', array $options = null) { $this->url = $url; $this->expectedtimeformat = $expectedtimeformat; if ($options === null) { $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)', 'Cache-Control: no-cache' ) ) ); } $this->options = $options; } /** * {@inheritdoc} */ 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 \Exception('Invalid or no "Date:" header found'); } catch (\Exception $ex) { throw new TimeException(sprintf('Unable to retrieve time from %s (%s)', $this->url, $ex->getMessage())); } } }
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