code: func ValidateToken(token string, fldPath *field.Path) field.ErrorList {
  	allErrs := field.ErrorList{}
  
  	if !bootstraputil.IsValidBootstrapToken(token) {
  		allErrs = append(allErrs, field.Invalid(fldPath, token, "the bootstrap token is invalid"))
  	}
  
  	return allErrs
  }
docs: // ValidateToken validates a Bootstrap Token