* Implemented ITimeProviders

2026-10-05 11:27:35 +00:00 · 2017-02-17 14:53:55 +01:00
parent 178c60d947
commit 9735116635
16 changed files with 232 additions and 27 deletions
@@ -0,0 +1,51 @@
+<?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 $url;
+
+    function __construct($url = 'https://google.com')
+    {
+        $this->url = $url;
+    }
+
+    public function getTime() {
+        try {
+            $host = parse_url($this->url, PHP_URL_HOST);
+            $context  = stream_context_create([
+                'http' => [
+                    'method' => 'HEAD',
+                    'follow_location' => false,
+                    'ignore_errors' => true,
+                    'max_redirects' => 0,
+                    'request_fulluri' => true,
+                    'header' => [
+                        'Connection: close',
+                        'User-agent: TwoFactorAuth HttpTimeProvider (https://github.com/RobThree/TwoFactorAuth)'
+                    ]
+                ],
+                'ssl' => [
+                    'SNI_enabled' => true,
+                    'SNI_server_name' => $host
+                ]
+            ]);
+            $fd = fopen($this->url, 'rb', false, $context);
+            $headers = stream_get_meta_data($fd)['wrapper_data'];
+            fclose($fd);
+
+            foreach ($headers as $h) {
+                if (strcasecmp(substr($h, 0, 5), 'Date:') === 0)
+                    return \DateTime::createFromFormat('D, d M Y H:i:s O+', 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()));
+        }
+    }
+}