function hook_file_validate in Drupal 9

Same name and namespace in other branches

1. 8 core/modules/file/file.api.php \hook_file_validate()
2. 7 modules/system/system.api.php \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\FileInterface $file: The file entity being validated.

Return value

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

See also

file_validate()

Related topics

1 function implements 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_test_file_validate in core/modules/file/tests/file_test/file_test.module

Implements hook_file_validate().

1 invocation of hook_file_validate()

file_validate in core/modules/file/file.module

Checks that a file meets the criteria specified by the validators.

File

core/modules/file/file.api.php, line 74

Hooks for file module.

Code

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