src/Wallabag/CoreBundle/Helper/Tools.php

   1 <?php
   2
   3 namespace Wallabag\CoreBundle\Helper;
   4
   5 final class Tools
   6 {
   7     /**
   8      * Download a file (typically, for downloading pictures on web server)
   9      *
  10      * @param $url
  11      * @return bool|mixed|string
  12      */
  13     public static function getFile($url)
  14     {
  15         $timeout = 15;
  16         $useragent = "Mozilla/5.0 (Windows NT 5.1; rv:18.0) Gecko/20100101 Firefox/18.0";
  17
  18         if (in_array('curl', get_loaded_extensions())) {
  19             # Fetch feed from URL
  20             $curl = curl_init();
  21             curl_setopt($curl, CURLOPT_URL, $url);
  22             curl_setopt($curl, CURLOPT_TIMEOUT, $timeout);
  23             if (!ini_get('open_basedir') && !ini_get('safe_mode')) {
  24                 curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
  25             }
  26             curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
  27             curl_setopt($curl, CURLOPT_HEADER, false);
  28
  29             # for ssl, do not verified certificate
  30             curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
  31             curl_setopt($curl, CURLOPT_AUTOREFERER, true);
  32
  33             # FeedBurner requires a proper USER-AGENT...
  34             curl_setopt($curl, CURL_HTTP_VERSION_1_1, true);
  35             curl_setopt($curl, CURLOPT_ENCODING, "gzip, deflate");
  36             curl_setopt($curl, CURLOPT_USERAGENT, $useragent);
  37
  38             $data = curl_exec($curl);
  39             $httpcode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
  40             $httpcodeOK = isset($httpcode) and ($httpcode == 200 or $httpcode == 301);
  41             curl_close($curl);
  42         } else {
  43             # create http context and add timeout and user-agent
  44             $context = stream_context_create(
  45                 array(
  46                     'http' => array(
  47                         'timeout' => $timeout,
  48                         'header' => "User-Agent: ".$useragent,
  49                         'follow_location' => true,
  50                     ),
  51                     'ssl' => array(
  52                         'verify_peer' => false,
  53                         'allow_self_signed' => true,
  54                     ),
  55                 )
  56             );
  57
  58             # only download page lesser than 4MB
  59             $data = @file_get_contents($url, false, $context, -1, 4000000);
  60
  61             if (isset($http_response_header) and isset($http_response_header[0])) {
  62                 $httpcodeOK = isset($http_response_header) and isset($http_response_header[0]) and ((strpos($http_response_header[0], '200 OK') !== false) or (strpos($http_response_header[0], '301 Moved Permanently') !== false));
  63             }
  64         }
  65
  66         # if response is not empty and response is OK
  67         if (isset($data) and isset($httpcodeOK) and $httpcodeOK) {
  68             # take charset of page and get it
  69             preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
  70
  71             # if meta tag is found
  72             if (!empty($meta[0])) {
  73                 preg_match('#charset="?(.*)"#si', $meta[0], $encoding);
  74                 # if charset is found set it otherwise, set it to utf-8
  75                 $html_charset = (!empty($encoding[1])) ? strtolower($encoding[1]) : 'utf-8';
  76                 if (empty($encoding[1])) {
  77                     $encoding[1] = 'utf-8';
  78                 }
  79             } else {
  80                 $html_charset = 'utf-8';
  81                 $encoding[1] = '';
  82             }
  83
  84             # replace charset of url to charset of page
  85             $data = str_replace('charset='.$encoding[1], 'charset='.$html_charset, $data);
  86
  87             return $data;
  88         } else {
  89             return false;
  90         }
  91     }
  92
  93     /**
  94      * Encode a URL by using a salt
  95      *
  96      * @param $string
  97      * @return string
  98      */
  99     public static function encodeString($string)
 100     {
 101         return sha1($string.SALT);
 102     }
 103
 104     public static function generateToken()
 105     {
 106         if (ini_get('open_basedir') === '') {
 107             if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
 108                 // alternative to /dev/urandom for Windows
 109                 $token = substr(base64_encode(uniqid(mt_rand(), true)), 0, 20);
 110             } else {
 111                 $token = substr(base64_encode(file_get_contents('/dev/urandom', false, null, 0, 20)), 0, 15);
 112             }
 113         } else {
 114             $token = substr(base64_encode(uniqid(mt_rand(), true)), 0, 20);
 115         }
 116
 117         return str_replace('+', '', $token);
 118     }
 119 }