topical media & game development

topical media & game development

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

lib-ajax-example-relay-relay.php / php


  <?php
  
  # List the allowed domain names below, between quote
  #   characters, with all but the last followed by a comma.
  #
  # This is to restrict opportunities for cross site
  #   scripting. Pages can only be retrieved from the
  #   domains listed here.
  #
  # In order to retrieve pages from both example.com and
  #   www.example.com, both domains must be listed.
  
   $AllowedDomains = Array(
  "www.cs.vu.nl",
  "www.few.vu.nl"
  );
  
  # Notes:
  
  # Check for a URL in the query string, as a value in a
  #   GET variable, or as a value in a POST variable. The
  #   first to match is used. If none match, exit.
  
  if( isset($ _SERVER['QUERY_STRING']) and preg_match('/^http:\/\//i', $_SERVER['QUERY_STRING']) )$ 
  { url =  $_SERVER['QUERY_STRING']; }
  elseif( isset($ _GET['url']) and preg_match('/^http:\/\//i', $_GET['url']) )$ 
  { url =  $_GET['url']; }
  elseif( isset($ _POST['url']) and preg_match('/^http:\/\//i', $_POST['url']) )$ 
  { url =  $_POST['url']; }
  else
  { exit; }
  
  # Verify the domain in the URL is allowed. If unable to
  #   verify, exit.$ checkdomain = preg_replace('/^http:\/\//i','', $url);$ 
  checkdomain = preg_replace('/\/.* $/','',$ checkdomain);
   $checkdomain = strtolower($ checkdomain);
   $domainokay = false;
  foreach($ AllowedDomains as  $domain)
  {
          if($ checkdomain == strtolower( $domain) )
          {$ domainokay = true;
                  break;
          }
  }
  if(!  $domainokay)
  { exit; }
  
  # An URL may be used as a filename with function readfile()
  #   when URL-aware fopen wrappers are enabled. See
  # http://us2.php.net/manual/en/ref.filesystem.php#ini.allow-url-fopen
  
  readfile($ url);
  exit;
  # When URL-aware fopen wrappers are not enabled, the
  #   following can be used.
  
  # Retrieve the page and echo it to the browser.
  
  # Break URL into host and URI parts.
  if(strpos( $url,'/') == 0)
  {$ host =  $_SERVER['SERVER_NAME'];$ uri =  $url;
  }
  else
  {$ url = preg_replace('/^.+?:\/\//','', $url);$ 
          pos = strpos( $url,'/');$ host = substr( $url,0,$ pos);
           $uri = substr($ url, $pos);
  }
  # Open socket and store remote web page in$ content
   $content = '';$ fp = @fsockopen(" $host",80,$ errno, $errstr,30);
  if(!$ fp)
  {
          echo("Error:  $errstr ($ errno)");
          exit;
  }
  else
  {
  
          fwrite( $fp,"GET$ uri HTTP/1.0\r\n");
          fwrite( $fp,"Host:$ host\r\n");
          if( isset( $_SERVER['HTTP_USER_AGENT']) )
          { fwrite($ fp,'User-Agent: '. $_SERVER['HTTP_USER_AGENT']."\r\n"); }
          fwrite($ fp,"Connection: Close\r\n");
          fwrite( $fp,"\r\n");
          while (! feof($ fp) )
          {  $content .= fgets($ fp,1024); }
          fclose( $fp);
  }
  # Remove header lines from content and echo the rest to
  #   the browser.
  if( strpos($ content,"\r") > 0 )
  { echo( preg_replace('/^.+?[\r\n]{4,}/s','', $content) ); }
  else
  { echo( preg_replace('/^.+?\n{2,}/s','',$ content) ); }
  ?>

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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