function hook_file_access

Control access to a file.

Modules may implement this hook if they want to have a say in whether or not a given user has access to perform a given operation on a file.

The administrative account (user ID #1) always passes any access check, so this hook is not called in that case. Users with the "bypass file access" permission may always view and edit files through the administrative interface.

Note that not all modules will want to influence access on all file types. If your module does not want to actively grant or block access, return FILE_ACCESS_IGNORE or simply return nothing. Blindly returning FALSE will break other file access modules.

Parameters

string $op: The operation to be performed. Possible values:

• "create"
• "delete"
• "update"
• "view"
• "download".

object $file: The file on which the operation is to be performed, or, if it does not yet exist, the type of file to be created.

object $account: A user object representing the user for whom the operation is to be performed.

Return value

string|null: FILE_ACCESS_ALLOW if the operation is to be allowed; FILE_ACCESS_DENY if the operation is to be denied; FILE_ACCESS_IGNORE to not affect this operation at all.

Related topics

File

modules/file/file.api.php, line 259

Hooks for file module.

Code

function hook_file_access($op, $file, $account) {
  $type = is_string($file) ? $file : $file->type;

  if ($op !== 'create' && (REQUEST_TIME - $file->timestamp) < 3600) {
    // If the file was uploaded in the last hour, deny access to it.
    return FILE_ACCESS_DENY;
  }

  // Returning nothing from this function would have the same effect.
  return FILE_ACCESS_IGNORE;
}