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   1  <?php
   2  /**
   3  *
   4  * This file is part of the phpBB Forum Software package.
   5  *
   6  * @copyright (c) phpBB Limited <https://www.phpbb.com>
   7  * @license GNU General Public License, version 2 (GPL-2.0)
   8  *
   9  * For full copyright and license information, please see
  10  * the docs/CREDITS.txt file.
  11  *
  12  */
  13  
  14  namespace phpbb;
  15  
  16  class file_downloader
  17  {
  18      /** @var string Error string */
  19      protected $error_string = '';
  20  
  21      /** @var int Error number */
  22      protected $error_number = 0;
  23  
  24      /**
  25       * Retrieve contents from remotely stored file
  26       *
  27       * @param string    $host            File host
  28       * @param string    $directory        Directory file is in
  29       * @param string    $filename        Filename of file to retrieve
  30       * @param int        $port            Port to connect to; default: 80
  31       * @param int        $timeout        Connection timeout in seconds; default: 6
  32       *
  33       * @return mixed File data as string if file can be read and there is no
  34       *            timeout, false if there were errors or the connection timed out
  35       *
  36       * @throws \phpbb\exception\runtime_exception If data can't be retrieved and no error
  37       *        message is returned
  38       */
  39  	public function get($host, $directory, $filename, $port = 80, $timeout = 6)
  40      {
  41          // Set default values for error variables
  42          $this->error_number = 0;
  43          $this->error_string = '';
  44  
  45          if ($socket = @fsockopen(($port == 443 ? 'tls://' : '') . $host, $port, $this->error_number, $this->error_string, $timeout))
  46          {
  47              @fputs($socket, "GET $directory/$filename HTTP/1.0\r\n");
  48              @fputs($socket, "HOST: $host\r\n");
  49              @fputs($socket, "Connection: close\r\n\r\n");
  50  
  51              $timer_stop = time() + $timeout;
  52              stream_set_timeout($socket, $timeout);
  53  
  54              $file_info = '';
  55              $get_info = false;
  56  
  57              while (!@feof($socket))
  58              {
  59                  if ($get_info)
  60                  {
  61                      $file_info .= @fread($socket, 1024);
  62                  }
  63                  else
  64                  {
  65                      $line = @fgets($socket, 1024);
  66                      if ($line == "\r\n")
  67                      {
  68                          $get_info = true;
  69                      }
  70                      else if (stripos($line, '404 not found') !== false)
  71                      {
  72                          throw new \phpbb\exception\runtime_exception('FILE_NOT_FOUND', array($filename));
  73                      }
  74                  }
  75  
  76                  $stream_meta_data = stream_get_meta_data($socket);
  77  
  78                  if (!empty($stream_meta_data['timed_out']) || time() >= $timer_stop)
  79                  {
  80                      throw new \phpbb\exception\runtime_exception('FSOCK_TIMEOUT');
  81                  }
  82              }
  83              @fclose($socket);
  84          }
  85          else
  86          {
  87              if ($this->error_string)
  88              {
  89                  $this->error_string = utf8_convert_message($this->error_string);
  90                  return false;
  91              }
  92              else
  93              {
  94                  throw new \phpbb\exception\runtime_exception('FSOCK_DISABLED');
  95              }
  96          }
  97  
  98          return $file_info;
  99      }
 100  
 101      /**
 102       * Get error string
 103       *
 104       * @return string Error string
 105       */
 106  	public function get_error_string()
 107      {
 108          return $this->error_string;
 109      }
 110  
 111      /**
 112       * Get error number
 113       *
 114       * @return int Error number
 115       */
 116  	public function get_error_number()
 117      {
 118          return $this->error_number;
 119      }
 120  }