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