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 $url
  11      *
  12      * @return bool|mixed|string
  13      */
  14     public static function getFile($url)
  15     {
  16         $timeout = 15;
  17         $useragent = 'Mozilla/5.0 (Windows NT 5.1; rv:18.0) Gecko/20100101 Firefox/18.0';
  18
  19         if (in_array('curl', get_loaded_extensions())) {
  20             # Fetch feed from URL
  21             $curl = curl_init();
  22             curl_setopt($curl, CURLOPT_URL, $url);
  23             curl_setopt($curl, CURLOPT_TIMEOUT, $timeout);
  24             if (!ini_get('open_basedir') && !ini_get('safe_mode')) {
  25                 curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
  26             }
  27             curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
  28             curl_setopt($curl, CURLOPT_HEADER, false);
  29
  30             # for ssl, do not verified certificate
  31             curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
  32             curl_setopt($curl, CURLOPT_AUTOREFERER, true);
  33
  34             # FeedBurner requires a proper USER-AGENT...
  35             curl_setopt($curl, CURL_HTTP_VERSION_1_1, true);
  36             curl_setopt($curl, CURLOPT_ENCODING, 'gzip, deflate');
  37             curl_setopt($curl, CURLOPT_USERAGENT, $useragent);
  38
  39             $data = curl_exec($curl);
  40             $httpcode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
  41             $httpcodeOK = isset($httpcode) and ($httpcode == 200 or $httpcode == 301);
  42             curl_close($curl);
  43         } else {
  44             # create http context and add timeout and user-agent
  45             $context = stream_context_create(
  46                 array(
  47                     'http' => array(
  48                         'timeout' => $timeout,
  49                         'header' => 'User-Agent: '.$useragent,
  50                         'follow_location' => true,
  51                     ),
  52                     'ssl' => array(
  53                         'verify_peer' => false,
  54                         'allow_self_signed' => true,
  55                     ),
  56                 )
  57             );
  58
  59             # only download page lesser than 4MB
  60             $data = @file_get_contents($url, false, $context, -1, 4000000);
  61
  62             if (isset($http_response_header) and isset($http_response_header[0])) {
  63                 $httpcodeOK = isset($http_response_header) and isset($http_response_header[0]) and ((strpos($http_response_header[0], '200 OK') !== false) or (strpos($http_response_header[0], '301 Moved Permanently') !== false));
  64             }
  65         }
  66
  67         # if response is not empty and response is OK
  68         if (isset($data) and isset($httpcodeOK) and $httpcodeOK) {
  69             # take charset of page and get it
  70             preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
  71
  72             # if meta tag is found
  73             if (!empty($meta[0])) {
  74                 preg_match('#charset="?(.*)"#si', $meta[0], $encoding);
  75                 # if charset is found set it otherwise, set it to utf-8
  76                 $html_charset = (!empty($encoding[1])) ? strtolower($encoding[1]) : 'utf-8';
  77                 if (empty($encoding[1])) {
  78                     $encoding[1] = 'utf-8';
  79                 }
  80             } else {
  81                 $html_charset = 'utf-8';
  82                 $encoding[1] = '';
  83             }
  84
  85             # replace charset of url to charset of page
  86             $data = str_replace('charset='.$encoding[1], 'charset='.$html_charset, $data);
  87
  88             return $data;
  89         } else {
  90             return false;
  91         }
  92     }
  93
  94     /**
  95      * Encode a URL by using a salt.
  96      *
  97      * @param $string
  98      *
  99      * @return string
 100      */
 101     public static function encodeString($string)
 102     {
 103         return sha1($string.SALT);
 104     }
 105
 106     public static function generateToken()
 107     {
 108         if (ini_get('open_basedir') === '') {
 109             if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
 110                 // alternative to /dev/urandom for Windows
 111                 $token = substr(base64_encode(uniqid(mt_rand(), true)), 0, 20);
 112             } else {
 113                 $token = substr(base64_encode(file_get_contents('/dev/urandom', false, null, 0, 20)), 0, 15);
 114             }
 115         } else {
 116             $token = substr(base64_encode(uniqid(mt_rand(), true)), 0, 20);
 117         }
 118
 119         return str_replace('+', '', $token);
 120     }
 121 }