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mastodon/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 reserved_username?(value)
return false unless Setting.reserved_usernames
Setting.reserved_usernames.include?(value.downcase)
end
end