function file_unmanaged_prepare

Internal function that prepares the destination for a file_unmanaged_copy or file_unmanaged_move operation.

• Checks if $source and $destination are valid and readable/writable.
• Checks that $source is not equal to $destination; if they are an error is reported.
• If file already exists in $destination either the call will error out, replace the file or rename the file based on the $replace parameter.

Parameters

$source: A string specifying the filepath or URI of the source file.

$destination: A URI containing the destination that $source should be moved/copied to. The URI may be a bare filepath (without a scheme) and in that case the default scheme (file://) will be used. If this value is omitted, Backdrop's default files scheme will be used, usually "public://".

$replace: Replace behavior when the destination file already exists:

• FILE_EXISTS_REPLACE - Replace the existing file.
• FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is unique.
• FILE_EXISTS_ERROR - Do nothing and return FALSE.

Return value

TRUE, or FALSE in the event of an error.:

See also

file_unmanaged_copy()

file_unmanaged_move()

Related topics

File

core/includes/file.inc, line 952

API for handling file uploads and server file management.

Code

function file_unmanaged_prepare($source, &$destination = NULL, $replace = FILE_EXISTS_RENAME) {
  $original_source = $source;

  // Assert that the source file actually exists.
  if (!file_exists($source)) {
    // @todo Replace backdrop_set_message() calls with exceptions instead.
    backdrop_set_message(t('The specified file %file could not be moved/copied because no file by that name exists. Please check that you supplied the correct filename.', array('%file' => $original_source)), 'error');
    if (($realpath = backdrop_realpath($original_source)) !== FALSE) {
      watchdog('file', 'File %file (%realpath) could not be copied because it does not exist.', array('%file' => $original_source, '%realpath' => $realpath));
    }
    else {
      watchdog('file', 'File %file could not be moved/copied because it does not exist.', array('%file' => $original_source));
    }
    return FALSE;
  }

  // Build a destination URI if necessary.
  if (!isset($destination)) {
    $destination = file_build_uri(backdrop_basename($source));
  }

  // Prepare the destination directory.
  if (file_prepare_directory($destination)) {
    // The destination is already a directory, so append the source basename.
    $destination = file_stream_wrapper_uri_normalize($destination . '/' . backdrop_basename($source));
  }
  else {
    // Perhaps $destination is a dir/file?
    $dirname = backdrop_dirname($destination);
    if (!file_prepare_directory($dirname)) {
      // The destination is not valid.
      watchdog('file', 'File %file could not be moved/copied because the destination directory %destination is not configured correctly.', array('%file' => $original_source, '%destination' => $dirname));
      backdrop_set_message(t('The specified file %file could not be moved/copied because the destination directory is not properly configured. This may be caused by a problem with file or directory permissions. More information is available in the system log.', array('%file' => $original_source)), 'error');
      return FALSE;
    }
  }

  // Determine whether we can perform this operation based on overwrite rules.
  $destination = file_destination($destination, $replace);
  if ($destination === FALSE) {
    backdrop_set_message(t('The file %file could not be moved/copied because a file by that name already exists in the destination directory.', array('%file' => $original_source)), 'error');
    watchdog('file', 'File %file could not be moved/copied because a file by that name already exists in the destination directory (%directory)', array('%file' => $original_source, '%directory' => $destination));
    return FALSE;
  }

  // Assert that the source and destination filenames are not the same.
  $real_source = backdrop_realpath($source);
  $real_destination = backdrop_realpath($destination);
  if ($source == $destination || ($real_source !== FALSE) && ($real_source == $real_destination)) {
    backdrop_set_message(t('The specified file %file was not moved/copied because it would overwrite itself.', array('%file' => $source)), 'error');
    watchdog('file', 'File %file could not be moved/copied because it would overwrite itself.', array('%file' => $source));
    return FALSE;
  }
  // Make sure the .htaccess files are present.
  file_ensure_htaccess();

  return TRUE;
}