function hook_file_validate

Check that files meet a given criteria.

This hook lets modules perform additional validation on files. They're able to report a failure by returning one or more error messages.

Parameters

Drupal\file\File $file: The file entity being validated.

Return value

An array of error messages. If there are no problems with the file return an empty array.

See also

file_validate()

2 functions implement hook_file_validate()

Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.

file_managed_file_validate in drupal/core/modules/file/file.module
Render API callback: Validates the managed_file element.
file_test_file_validate in drupal/core/modules/file/tests/file_test/file_test.module
Implements hook_file_validate().
1 invocation of hook_file_validate()
file_validate in drupal/core/modules/file/file.module
Checks that a file meets the criteria specified by the validators.

File

drupal/core/modules/file/file.api.php, line 60
Hooks for file module.

Code

function hook_file_validate(Drupal\file\File $file) {
  $errors = array();
  if (empty($file->filename)) {
    $errors[] = t("The file's name is empty. Please give a name to the file.");
  }
  if (strlen($file->filename) > 255) {
    $errors[] = t("The file's name exceeds the 255 characters limit. Please rename the file and try again.");
  }
  return $errors;
}