discourse/lib/onebox/domain_checker.rb

# frozen_string_literal: true

module Onebox
  class DomainChecker
    def self.is_blocked?(hostname)
      normalized_hostname = hostname.to_s.downcase

      SiteSetting
        .blocked_onebox_domains
        &.split("|")
        &.any? do |blocked|
          normalized_blocked = blocked.downcase
          normalized_hostname == normalized_blocked ||
            normalized_hostname.end_with?(".#{normalized_blocked}")
        end
    end
  end
end