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/wp-includes/ -> ms-files.php (source)

   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  
  18  ms_file_constants();
  19  
  20  error_reporting( 0 );
  21  
  22  if ( $current_blog->archived == '1' || $current_blog->spam == '1' || $current_blog->deleted == '1' ) {
  23      status_header( 404 );
  24      die( '404 &#8212; File not found.' );
  25  }
  26  
  27  $file = rtrim( BLOGUPLOADDIR, '/' ) . '/' . str_replace( '..', '', $_GET['file'] );
  28  if ( ! is_file( $file ) ) {
  29      status_header( 404 );
  30      die( '404 &#8212; File not found.' );
  31  }
  32  
  33  $mime = wp_check_filetype( $file );
  34  if ( false === $mime['type'] && function_exists( 'mime_content_type' ) ) {
  35      $mime['type'] = mime_content_type( $file );
  36  }
  37  
  38  if ( $mime['type'] ) {
  39      $mimetype = $mime['type'];
  40  } else {
  41      $mimetype = 'image/' . substr( $file, strrpos( $file, '.' ) + 1 );
  42  }
  43  
  44  header( 'Content-Type: ' . $mimetype ); // always send this
  45  if ( false === strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS' ) ) {
  46      header( 'Content-Length: ' . filesize( $file ) );
  47  }
  48  
  49  // Optional support for X-Sendfile and X-Accel-Redirect
  50  if ( WPMU_ACCEL_REDIRECT ) {
  51      header( 'X-Accel-Redirect: ' . str_replace( WP_CONTENT_DIR, '', $file ) );
  52      exit;
  53  } elseif ( WPMU_SENDFILE ) {
  54      header( 'X-Sendfile: ' . $file );
  55      exit;
  56  }
  57  
  58  $last_modified = gmdate( 'D, d M Y H:i:s', filemtime( $file ) );
  59  $etag          = '"' . md5( $last_modified ) . '"';
  60  header( "Last-Modified: $last_modified GMT" );
  61  header( 'ETag: ' . $etag );
  62  header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + 100000000 ) . ' GMT' );
  63  
  64  // Support for Conditional GET - use stripslashes to avoid formatting.php dependency
  65  $client_etag = isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) ? stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) : false;
  66  
  67  if ( ! isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
  68      $_SERVER['HTTP_IF_MODIFIED_SINCE'] = false;
  69  }
  70  
  71  $client_last_modified = trim( $_SERVER['HTTP_IF_MODIFIED_SINCE'] );
  72  // If string is empty, return 0. If not, attempt to parse into a timestamp
  73  $client_modified_timestamp = $client_last_modified ? strtotime( $client_last_modified ) : 0;
  74  
  75  // Make a timestamp for our most recent modification...
  76  $modified_timestamp = strtotime( $last_modified );
  77  
  78  if ( ( $client_last_modified && $client_etag )
  79      ? ( ( $client_modified_timestamp >= $modified_timestamp ) && ( $client_etag == $etag ) )
  80      : ( ( $client_modified_timestamp >= $modified_timestamp ) || ( $client_etag == $etag ) )
  81      ) {
  82      status_header( 304 );
  83      exit;
  84  }
  85  
  86  // If we made it this far, just serve the file
  87  readfile( $file );
  88  flush();


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