mastodon/app/validators/poll_expiration_validator.rb

# frozen_string_literal: true

class PollExpirationValidator < ActiveModel::Validator
  MAX_EXPIRATION = 1.month.freeze
  MIN_EXPIRATION = 5.minutes.freeze

  def validate(poll)
    # We have a `presence: true` check for this attribute already
    return if poll.expires_at.nil?

    current_time = Time.now.utc

    poll.errors.add(:expires_at, I18n.t('polls.errors.duration_too_long')) if poll.expires_at - current_time > MAX_EXPIRATION
    poll.errors.add(:expires_at, I18n.t('polls.errors.duration_too_short')) if (poll.expires_at - current_time).ceil < MIN_EXPIRATION
  end
end