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   1  <?php
   2  /**
   3   * Multisite upload handler.
   4   *
   5   * @since 3.0.0
   6   *
   7   * @package WordPress
   8   * @subpackage Multisite
   9   */
  10  
  11  define( 'SHORTINIT', true );
  12  require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
  13  
  14  if( !is_multisite() )
  15      die( 'Multisite support not enabled' );
  16  
  17  ms_file_constants();
  18  
  19  error_reporting( 0 );
  20  
  21  if ( $current_blog->archived == '1' || $current_blog->spam == '1' || $current_blog->deleted == '1' ) {
  22      status_header( 404 );
  23      die( '404 &#8212; File not found.' );
  24  }
  25  
  26  $file = rtrim( BLOGUPLOADDIR, '/' ) . '/' . str_replace( '..', '', $_GET[ 'file' ] );
  27  if ( !is_file( $file ) ) {
  28      status_header( 404 );
  29      die( '404 &#8212; File not found.' );
  30  }
  31  
  32  $mime = wp_check_filetype( $file );
  33  if( false === $mime[ 'type' ] && function_exists( 'mime_content_type' ) )
  34      $mime[ 'type' ] = mime_content_type( $file );
  35  
  36  if( $mime[ 'type' ] )
  37      $mimetype = $mime[ 'type' ];
  38  else
  39      $mimetype = 'image/' . substr( $file, strrpos( $file, '.' ) + 1 );
  40  
  41  header( 'Content-Type: ' . $mimetype ); // always send this
  42  if ( false === strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS' ) )
  43      header( 'Content-Length: ' . filesize( $file ) );
  44  
  45  // Optional support for X-Sendfile and X-Accel-Redirect
  46  if ( WPMU_ACCEL_REDIRECT ) {
  47      header( 'X-Accel-Redirect: ' . str_replace( WP_CONTENT_DIR, '', $file ) );
  48      exit;
  49  } elseif ( WPMU_SENDFILE ) {
  50      header( 'X-Sendfile: ' . $file );
  51      exit;
  52  }
  53  
  54  $last_modified = gmdate( 'D, d M Y H:i:s', filemtime( $file ) );
  55  $etag = '"' . md5( $last_modified ) . '"';
  56  header( "Last-Modified: $last_modified GMT" );
  57  header( 'ETag: ' . $etag );
  58  header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + 100000000 ) . ' GMT' );
  59  
  60  // Support for Conditional GET - use stripslashes to avoid formatting.php dependency
  61  $client_etag = isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) ? stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) : false;
  62  
  63  if( ! isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) )
  64      $_SERVER['HTTP_IF_MODIFIED_SINCE'] = false;
  65  
  66  $client_last_modified = trim( $_SERVER['HTTP_IF_MODIFIED_SINCE'] );
  67  // If string is empty, return 0. If not, attempt to parse into a timestamp
  68  $client_modified_timestamp = $client_last_modified ? strtotime( $client_last_modified ) : 0;
  69  
  70  // Make a timestamp for our most recent modification...
  71  $modified_timestamp = strtotime($last_modified);
  72  
  73  if ( ( $client_last_modified && $client_etag )
  74      ? ( ( $client_modified_timestamp >= $modified_timestamp) && ( $client_etag == $etag ) )
  75      : ( ( $client_modified_timestamp >= $modified_timestamp) || ( $client_etag == $etag ) )
  76      ) {
  77      status_header( 304 );
  78      exit;
  79  }
  80  
  81  // If we made it this far, just serve the file
  82  readfile( $file );