function FileExtensionConstraintValidator::validate

File

core/modules/file/src/Plugin/Validation/Constraint/FileExtensionConstraintValidator.php, line 18

Class

FileExtensionConstraintValidator

Validates the file extension constraint.

Namespace

Code

public function validate(mixed $value, Constraint $constraint) {
  $file = $this->assertValueIsFile($value);
  if (!$constraint instanceof FileExtensionConstraint) {
    throw new UnexpectedTypeException($constraint, FileExtensionConstraint::class);
  }
  $extensions = $constraint->extensions;
  $regex = '/\\.(' . preg_replace('/ +/', '|', preg_quote($extensions)) . ')$/i';
  // Filename may differ from the basename, for instance in case files
  // migrated from D7 file entities. Because of that new files are saved
  // temporarily with a generated file name, without the original extension,
  // we will use the generated filename property for extension validation only
  // in case of temporary files; and use the file system file name in case of
  // permanent files.
  $subject = $file->isTemporary() ? $file->getFilename() : $file->getFileUri();
  if (!preg_match($regex, $subject)) {
    $this->context
      ->addViolation($constraint->message, [
      '%files-allowed' => $extensions,
    ]);
  }
}