catstodon/app/validators/unreserved_username_validator.rb

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# frozen_string_literal: true
class UnreservedUsernameValidator < ActiveModel::Validator
def validate(account)
@username = account.username
return if @username.nil?
account.errors.add(:username, I18n.t('accounts.reserved_username')) if reserved_username?
end
private
def pam_controlled?
return false unless Devise.pam_authentication && Devise.pam_controlled_service
Rpam2.account(Devise.pam_controlled_service, @username).present?
end
def reserved_username?
return true if pam_controlled?
return false unless Setting.reserved_usernames
Setting.reserved_usernames.include?(@username.downcase)
end
end