mastodon/app/validators/status_pin_validator.rb

# frozen_string_literal: true

class StatusPinValidator < ActiveModel::Validator
  def validate(pin)
    pin.errors.add(:status, I18n.t('statuses.pin_errors.reblog')) if pin.status.reblog?
    pin.errors.add(:status, I18n.t('statuses.pin_errors.ownership')) if pin.account_id != pin.status.account_id
    pin.errors.add(:status, I18n.t('statuses.pin_errors.private')) unless %w(public unlisted).include?(pin.status.visibility)
  end
end