catstodon/app/validators/unreserved_username_validator.rb

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