C:/drupal/includes/file.inc

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<?php
// $Id: file.inc,v 1.125 2008/05/26 17:12:54 dries Exp $

define('FILE_DOWNLOADS_PUBLIC', 1);

define('FILE_DOWNLOADS_PRIVATE', 2);

define('FILE_CREATE_DIRECTORY', 1);

define('FILE_MODIFY_PERMISSIONS', 2);

define('FILE_EXISTS_RENAME', 0);

define('FILE_EXISTS_REPLACE', 1);

define('FILE_EXISTS_ERROR', 2);

define('FILE_STATUS_TEMPORARY', 0);

define('FILE_STATUS_PERMANENT', 1);

function file_create_url($path) {
  // Strip file_directory_path from $path. We only include relative paths in urls.
  if (strpos($path, file_directory_path() . '/') === 0) {
    $path = trim(substr($path, strlen(file_directory_path())), '\\/');
  }
  switch (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC)) {
    case FILE_DOWNLOADS_PUBLIC:
      return $GLOBALS['base_url'] . '/' . file_directory_path() . '/' . str_replace('\\', '/', $path);
    case FILE_DOWNLOADS_PRIVATE:
      return url('system/files/' . $path, array('absolute' => TRUE));
  }
}

function file_create_path($dest = 0) {
  $file_path = file_directory_path();
  if (!$dest) {
    return $file_path;
  }
  // file_check_location() checks whether the destination is inside the Drupal files directory.
  if (file_check_location($dest, $file_path)) {
    return $dest;
  }
  // check if the destination is instead inside the Drupal temporary files directory.
  else if (file_check_location($dest, file_directory_temp())) {
    return $dest;
  }
  // Not found, try again with prefixed directory path.
  else if (file_check_location($file_path . '/' . $dest, $file_path)) {
    return $file_path . '/' . $dest;
  }
  // File not found.
  return FALSE;
}

function file_check_directory(&$directory, $mode = 0, $form_item = NULL) {
  $directory = rtrim($directory, '/\\');

  // Check if directory exists.
  if (!is_dir($directory)) {
    if (($mode & FILE_CREATE_DIRECTORY) && @mkdir($directory)) {
      drupal_set_message(t('The directory %directory has been created.', array('%directory' => $directory)));
      @chmod($directory, 0775); // Necessary for non-webserver users.
    }
    else {
      if ($form_item) {
        form_set_error($form_item, t('The directory %directory does not exist.', array('%directory' => $directory)));
      }
      return FALSE;
    }
  }

  // Check to see if the directory is writable.
  if (!is_writable($directory)) {
    if (($mode & FILE_MODIFY_PERMISSIONS) && @chmod($directory, 0775)) {
      drupal_set_message(t('The permissions of directory %directory have been changed to make it writable.', array('%directory' => $directory)));
    }
    else {
      form_set_error($form_item, t('The directory %directory is not writable', array('%directory' => $directory)));
      watchdog('file system', 'The directory %directory is not writable, because it does not have the correct permissions set.', array('%directory' => $directory), WATCHDOG_ERROR);
      return FALSE;
    }
  }

  if ((file_directory_path() == $directory || file_directory_temp() == $directory) && !is_file("$directory/.htaccess")) {
    $htaccess_lines = "SetHandler Drupal_Security_Do_Not_Remove_See_SA_2006_006\nOptions None\nOptions +FollowSymLinks";
    if (($fp = fopen("$directory/.htaccess", 'w')) && fputs($fp, $htaccess_lines)) {
      fclose($fp);
      chmod($directory . '/.htaccess', 0664);
    }
    else {
      $variables = array('%directory' => $directory, '!htaccess' => '<br />' . nl2br(check_plain($htaccess_lines)));
      form_set_error($form_item, t("Security warning: Couldn't write .htaccess file. Please create a .htaccess file in your %directory directory which contains the following lines: <code>!htaccess</code>", $variables));
      watchdog('security', "Security warning: Couldn't write .htaccess file. Please create a .htaccess file in your %directory directory which contains the following lines: <code>!htaccess</code>", $variables, WATCHDOG_ERROR);
    }
  }

  return TRUE;
}

function file_check_path(&$path) {
  // Check if path is a directory.
  if (file_check_directory($path)) {
    return '';
  }

  // Check if path is a possible dir/file.
  $filename = basename($path);
  $path = dirname($path);
  if (file_check_directory($path)) {
    return $filename;
  }

  return FALSE;
}

function file_check_location($source, $directory = '') {
  $check = realpath($source);
  if ($check) {
    $source = $check;
  }
  else {
    // This file does not yet exist
    $source = realpath(dirname($source)) . '/' . basename($source);
  }
  $directory = realpath($directory);
  if ($directory && strpos($source, $directory) !== 0) {
    return 0;
  }
  return $source;
}

function file_copy(&$source, $dest = 0, $replace = FILE_EXISTS_RENAME) {
  $dest = file_create_path($dest);

  $directory = $dest;
  $basename = file_check_path($directory);

  // Make sure we at least have a valid directory.
  if ($basename === FALSE) {
    $source = is_object($source) ? $source->filepath : $source;
    drupal_set_message(t('The selected file %file could not be uploaded, because the destination %directory is not properly configured.', array('%file' => $source, '%directory' => $dest)), 'error');
    watchdog('file system', 'The selected file %file could not be uploaded, because the destination %directory could not be found, or because its permissions do not allow the file to be written.', array('%file' => $source, '%directory' => $dest), WATCHDOG_ERROR);
    return 0;
  }

  // Process a file upload object.
  if (is_object($source)) {
    $file = $source;
    $source = $file->filepath;
    if (!$basename) {
      $basename = $file->filename;
    }
  }

  $source = realpath($source);
  if (!file_exists($source)) {
    drupal_set_message(t('The selected file %file could not be copied, because no file by that name exists. Please check that you supplied the correct filename.', array('%file' => $source)), 'error');
    return 0;
  }

  // If the destination file is not specified then use the filename of the source file.
  $basename = $basename ? $basename : basename($source);
  $dest = $directory . '/' . $basename;

  // Make sure source and destination filenames are not the same, makes no sense
  // to copy it if they are. In fact copying the file will most likely result in
  // a 0 byte file. Which is bad. Real bad.
  if ($source != realpath($dest)) {
    if (!$dest = file_destination($dest, $replace)) {
      drupal_set_message(t('The selected file %file could not be copied, because a file by that name already exists in the destination.', array('%file' => $source)), 'error');
      return FALSE;
    }

    if (!@copy($source, $dest)) {
      drupal_set_message(t('The selected file %file could not be copied.', array('%file' => $source)), 'error');
      return 0;
    }

    // Give everyone read access so that FTP'd users or
    // non-webserver users can see/read these files,
    // and give group write permissions so group members
    // can alter files uploaded by the webserver.
    @chmod($dest, 0664);
  }

  if (isset($file) && is_object($file)) {
    $file->filename = $basename;
    $file->filepath = $dest;
    $source = $file;
  }
  else {
    $source = $dest;
  }

  return 1; // Everything went ok.
}

function file_destination($destination, $replace) {
  if (file_exists($destination)) {
    switch ($replace) {
      case FILE_EXISTS_RENAME:
        $basename = basename($destination);
        $directory = dirname($destination);
        $destination = file_create_filename($basename, $directory);
        break;

      case FILE_EXISTS_ERROR:
        drupal_set_message(t('The selected file %file could not be copied, because a file by that name already exists in the destination.', array('%file' => $destination)), 'error');
        return FALSE;
    }
  }
  return $destination;
}

function file_move(&$source, $dest = 0, $replace = FILE_EXISTS_RENAME) {
  $path_original = is_object($source) ? $source->filepath : $source;

  if (file_copy($source, $dest, $replace)) {
    $path_current = is_object($source) ? $source->filepath : $source;

    if ($path_original == $path_current || file_delete($path_original)) {
      return 1;
    }
    drupal_set_message(t('The removal of the original file %file has failed.', array('%file' => $path_original)), 'error');
  }
  return 0;
}

function file_munge_filename($filename, $extensions, $alerts = TRUE) {
  $original = $filename;

  // Allow potentially insecure uploads for very savvy users and admin
  if (!variable_get('allow_insecure_uploads', 0)) {
    $whitelist = array_unique(explode(' ', trim($extensions)));

    // Split the filename up by periods. The first part becomes the basename
    // the last part the final extension.
    $filename_parts = explode('.', $filename);
    $new_filename = array_shift($filename_parts); // Remove file basename.
    $final_extension = array_pop($filename_parts); // Remove final extension.

    // Loop through the middle parts of the name and add an underscore to the
    // end of each section that could be a file extension but isn't in the list
    // of allowed extensions.
    foreach ($filename_parts as $filename_part) {
      $new_filename .= '.' . $filename_part;
      if (!in_array($filename_part, $whitelist) && preg_match("/^[a-zA-Z]{2,5}\d?$/", $filename_part)) {
        $new_filename .= '_';
      }
    }
    $filename = $new_filename . '.' . $final_extension;

    if ($alerts && $original != $filename) {
      drupal_set_message(t('For security reasons, your upload has been renamed to %filename.', array('%filename' => $filename)));
    }
  }

  return $filename;
}

function file_unmunge_filename($filename) {
  return str_replace('_.', '.', $filename);
}

function file_create_filename($basename, $directory) {
  $dest = $directory . '/' . $basename;

  if (file_exists($dest)) {
    // Destination file already exists, generate an alternative.
    if ($pos = strrpos($basename, '.')) {
      $name = substr($basename, 0, $pos);
      $ext = substr($basename, $pos);
    }
    else {
      $name = $basename;
    }

    $counter = 0;
    do {
      $dest = $directory . '/' . $name . '_' . $counter++ . $ext;
    } while (file_exists($dest));
  }

  return $dest;
}

function file_delete($path) {
  if (is_file($path)) {
    return unlink($path);
  }
}

function file_space_used($uid = NULL) {
  if (isset($uid)) {
    return (int) db_result(db_query('SELECT SUM(filesize) FROM {files} WHERE uid = %d', $uid));
  }
  return (int) db_result(db_query('SELECT SUM(filesize) FROM {files}'));
}

function file_save_upload($source, $validators = array(), $dest = FALSE, $replace = FILE_EXISTS_RENAME) {
  global $user;
  static $upload_cache;

  // Add in our check of the the file name length.
  $validators['file_validate_name_length'] = array();

  // Return cached objects without processing since the file will have
  // already been processed and the paths in _FILES will be invalid.
  if (isset($upload_cache[$source])) {
    return $upload_cache[$source];
  }

  // If a file was uploaded, process it.
  if (isset($_FILES['files']) && $_FILES['files']['name'][$source] && is_uploaded_file($_FILES['files']['tmp_name'][$source])) {
    // Check for file upload errors and return FALSE if a
    // lower level system error occurred.
    switch ($_FILES['files']['error'][$source]) {
      // @see http://php.net/manual/en/features.file-upload.errors.php
      case UPLOAD_ERR_OK:
        break;

      case UPLOAD_ERR_INI_SIZE:
      case UPLOAD_ERR_FORM_SIZE:
        drupal_set_message(t('The file %file could not be saved, because it exceeds %maxsize, the maximum allowed size for uploads.', array('%file' => $source, '%maxsize' => format_size(file_upload_max_size()))), 'error');
        return 0;

      case UPLOAD_ERR_PARTIAL:
      case UPLOAD_ERR_NO_FILE:
        drupal_set_message(t('The file %file could not be saved, because the upload did not complete.', array('%file' => $source)), 'error');
        return 0;

        // Unknown error
      default:
        drupal_set_message(t('The file %file could not be saved. An unknown error has occurred.', array('%file' => $source)), 'error');
        return 0;
    }

    // Build the list of non-munged extensions.
    // @todo: this should not be here. we need to figure out the right place.
    $extensions = '';
    foreach ($user->roles as $rid => $name) {
      $extensions .= ' ' . variable_get("upload_extensions_$rid",
      variable_get('upload_extensions_default', 'jpg jpeg gif png txt html doc xls pdf ppt pps odt ods odp'));
    }

    // Begin building file object.
    $file = new stdClass();
    $file->filename = file_munge_filename(trim(basename($_FILES['files']['name'][$source]), '.'), $extensions);
    $file->filepath = $_FILES['files']['tmp_name'][$source];
    $file->filemime = $_FILES['files']['type'][$source];

    // Rename potentially executable files, to help prevent exploits.
    if (preg_match('/\.(php|pl|py|cgi|asp|js)$/i', $file->filename) && (substr($file->filename, -4) != '.txt')) {
      $file->filemime = 'text/plain';
      $file->filepath .= '.txt';
      $file->filename .= '.txt';
    }

    // If the destination is not provided, or is not writable, then use the
    // temporary directory.
    if (empty($dest) || file_check_path($dest) === FALSE) {
      $dest = file_directory_temp();
    }

    $file->source = $source;
    $file->destination = file_destination(file_create_path($dest . '/' . $file->filename), $replace);
    $file->filesize = $_FILES['files']['size'][$source];

    // Call the validation functions.
    $errors = array();
    foreach ($validators as $function => $args) {
      array_unshift($args, $file);
      $errors = array_merge($errors, call_user_func_array($function, $args));
    }

    // Check for validation errors.
    if (!empty($errors)) {
      $message = t('The selected file %name could not be uploaded.', array('%name' => $file->filename));
      if (count($errors) > 1) {
        $message .= '<ul><li>' . implode('</li><li>', $errors) . '</li></ul>';
      }
      else {
        $message .= ' ' . array_pop($errors);
      }
      form_set_error($source, $message);
      return 0;
    }

    // Move uploaded files from PHP's upload_tmp_dir to Drupal's temporary directory.
    // This overcomes open_basedir restrictions for future file operations.
    $file->filepath = $file->destination;
    if (!move_uploaded_file($_FILES['files']['tmp_name'][$source], $file->filepath)) {
      form_set_error($source, t('File upload error. Could not move uploaded file.'));
      watchdog('file', 'Upload error. Could not move uploaded file %file to destination %destination.', array('%file' => $file->filename, '%destination' => $file->filepath));
      return 0;
    }

    // If we made it this far it's safe to record this file in the database.
    $file->uid = $user->uid;
    $file->status = FILE_STATUS_TEMPORARY;
    $file->timestamp = time();
    drupal_write_record('files', $file);

    // Add file to the cache.
    $upload_cache[$source] = $file;
    return $file;
  }
  return 0;
}

function file_validate_name_length($file) {
  $errors = array();

  if (strlen($file->filename) > 255) {
    $errors[] = t('Its name exceeds the 255 characters limit. Please rename the file and try again.');
  }
  return $errors;
}

function file_validate_extensions($file, $extensions) {
  global $user;

  $errors = array();

  // Bypass validation for uid  = 1.
  if ($user->uid != 1) {
    $regex = '/\.(' . ereg_replace(' +', '|', preg_quote($extensions)) . ')$/i';
    if (!preg_match($regex, $file->filename)) {
      $errors[] = t('Only files with the following extensions are allowed: %files-allowed.', array('%files-allowed' => $extensions));
    }
  }
  return $errors;
}

function file_validate_size($file, $file_limit = 0, $user_limit = 0) {
  global $user;

  $errors = array();

  // Bypass validation for uid  = 1.
  if ($user->uid != 1) {
    if ($file_limit && $file->filesize > $file_limit) {
      $errors[] = t('The file is %filesize exceeding the maximum file size of %maxsize.', array('%filesize' => format_size($file->filesize), '%maxsize' => format_size($file_limit)));
    }

    $total_size = file_space_used($user->uid) + $file->filesize;
    if ($user_limit && $total_size > $user_limit) {
      $errors[] = t('The file is %filesize which would exceed your disk quota of %quota.', array('%filesize' => format_size($file->filesize), '%quota' => format_size($user_limit)));
    }
  }
  return $errors;
}

function file_validate_is_image(&$file) {
  $errors = array();

  $info = image_get_info($file->filepath);
  if (!$info || empty($info['extension'])) {
    $errors[] = t('Only JPEG, PNG and GIF images are allowed.');
  }

  return $errors;
}

function file_validate_image_resolution(&$file, $maximum_dimensions = 0, $minimum_dimensions = 0) {
  $errors = array();

  // Check first that the file is an image.
  if ($info = image_get_info($file->filepath)) {
    if ($maximum_dimensions) {
      // Check that it is smaller than the given dimensions.
      list($width, $height) = explode('x', $maximum_dimensions);
      if ($info['width'] > $width || $info['height'] > $height) {
        // Try to resize the image to fit the dimensions.
        if (image_get_toolkit() && image_scale($file->filepath, $file->filepath, $width, $height)) {
          drupal_set_message(t('The image was resized to fit within the maximum allowed dimensions of %dimensions pixels.', array('%dimensions' => $maximum_dimensions)));

          // Clear the cached filesize and refresh the image information.
          clearstatcache();
          $info = image_get_info($file->filepath);
          $file->filesize = $info['file_size'];
        }
        else {
          $errors[] = t('The image is too large; the maximum dimensions are %dimensions pixels.', array('%dimensions' => $maximum_dimensions));
        }
      }
    }

    if ($minimum_dimensions) {
      // Check that it is larger than the given dimensions.
      list($width, $height) = explode('x', $minimum_dimensions);
      if ($info['width'] < $width || $info['height'] < $height) {
        $errors[] = t('The image is too small; the minimum dimensions are %dimensions pixels.', array('%dimensions' => $minimum_dimensions));
      }
    }
  }

  return $errors;
}

function file_save_data($data, $dest, $replace = FILE_EXISTS_RENAME) {
  $temp = file_directory_temp();
  // On Windows, tempnam() requires an absolute path, so we use realpath().
  $file = tempnam(realpath($temp), 'file');
  if (!$fp = fopen($file, 'wb')) {
    drupal_set_message(t('The file could not be created.'), 'error');
    return 0;
  }
  fwrite($fp, $data);
  fclose($fp);

  if (!file_move($file, $dest, $replace)) {
    return 0;
  }

  return $file;
}

function file_set_status(&$file, $status) {
  if (db_query('UPDATE {files} SET status = %d WHERE fid = %d', $status, $file->fid)) {
    $file->status = $status;
    return TRUE;
  }
  return FALSE;
}

function file_transfer($source, $headers) {
  ob_end_clean();

  foreach ($headers as $header) {
    // To prevent HTTP header injection, we delete new lines that are
    // not followed by a space or a tab.
    // See http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
    $header = preg_replace('/\r?\n(?!\t| )/', '', $header);
    drupal_set_header($header);
  }

  $source = file_create_path($source);

  // Transfer file in 1024 byte chunks to save memory usage.
  if ($fd = fopen($source, 'rb')) {
    while (!feof($fd)) {
      print fread($fd, 1024);
    }
    fclose($fd);
  }
  else {
    drupal_not_found();
  }
  exit();
}

function file_download() {
  // Merge remainder of arguments from GET['q'], into relative file path.
  $args = func_get_args();
  $filepath = implode('/', $args);

  // Maintain compatibility with old ?file=paths saved in node bodies.
  if (isset($_GET['file'])) {
    $filepath =  $_GET['file'];
  }

  if (file_exists(file_create_path($filepath))) {
    $headers = module_invoke_all('file_download', $filepath);
    if (in_array(-1, $headers)) {
      return drupal_access_denied();
    }
    if (count($headers)) {
      file_transfer($filepath, $headers);
    }
  }
  return drupal_not_found();
}


function file_scan_directory($dir, $mask, $nomask = array('.', '..', 'CVS'), $callback = 0, $recurse = TRUE, $key = 'filename', $min_depth = 0, $depth = 0) {
  $key = (in_array($key, array('filename', 'basename', 'name')) ? $key : 'filename');
  $files = array();

  if (is_dir($dir) && $handle = opendir($dir)) {
    while (false !== ($file = readdir($handle))) {
      if (!in_array($file, $nomask) && $file[0] != '.') {
        if (is_dir("$dir/$file") && $recurse) {
          // Give priority to files in this folder by merging them in after any subdirectory files.
          $files = array_merge(file_scan_directory("$dir/$file", $mask, $nomask, $callback, $recurse, $key, $min_depth, $depth + 1), $files);
        }
        elseif ($depth >= $min_depth && ereg($mask, $file)) {
          // Always use this match over anything already set in $files with the same $$key.
          $filename = "$dir/$file";
          $basename = basename($file);
          $name = substr($basename, 0, strrpos($basename, '.'));
          $files[$$key] = new stdClass();
          $files[$$key]->filename = $filename;
          $files[$$key]->basename = $basename;
          $files[$$key]->name = $name;
          if ($callback) {
            $callback($filename);
          }
        }
      }
    }

    closedir($handle);
  }

  return $files;
}

function file_directory_temp() {
  $temporary_directory = variable_get('file_directory_temp', NULL);

  if (is_null($temporary_directory)) {
    $directories = array();

    // Has PHP been set with an upload_tmp_dir?
    if (ini_get('upload_tmp_dir')) {
      $directories[] = ini_get('upload_tmp_dir');
    }

    // Operating system specific dirs.
    if (substr(PHP_OS, 0, 3) == 'WIN') {
      $directories[] = 'c:\\windows\\temp';
      $directories[] = 'c:\\winnt\\temp';
      $path_delimiter = '\\';
    }
    else {
      $directories[] = '/tmp';
      $path_delimiter = '/';
    }

    foreach ($directories as $directory) {
      if (!$temporary_directory && is_dir($directory)) {
        $temporary_directory = $directory;
      }
    }

    // if a directory has been found, use it, otherwise default to 'files/tmp' or 'files\\tmp';
    $temporary_directory = $temporary_directory ? $temporary_directory : file_directory_path() . $path_delimiter . 'tmp';
    variable_set('file_directory_temp', $temporary_directory);
  }

  return $temporary_directory;
}

function file_directory_path() {
  return variable_get('file_directory_path', conf_path() . '/files');
}

function file_upload_max_size() {
  static $max_size = -1;

  if ($max_size < 0) {
    $upload_max = parse_size(ini_get('upload_max_filesize'));
    $post_max = parse_size(ini_get('post_max_size'));
    $max_size = ($upload_max < $post_max) ? $upload_max : $post_max;
  }
  return $max_size;
}

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