| <?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())); |
| } |
| |
| } |
| } |