discourse/lib/onebox/engine/stack_exchange_onebox.rb

# frozen_string_literal: true

module Onebox
  module Engine
    class StackExchangeOnebox
      include Engine
      include LayoutSupport
      include JSON

      def self.domains
        %w(stackexchange.com stackoverflow.com superuser.com serverfault.com askubuntu.com stackapps.com mathoverflow.net)
          .map { |domain| Regexp.escape(domain) }
      end

      matches_regexp(/^https?:\/\/(?:(?:(?<subsubdomain>\w*)\.)?(?<subdomain>\w*)\.)?(?<domain>#{domains.join('|')})\/((?:questions|q)\/(?<question_id>\d*)(\/.*\/(?<answer_id1>\d*))?|(a\/(?<answer_id2>\d*)))/)

      def always_https?
        uri.host.split('.').length <= 3
      end

      private

      def match
        @match ||= @url.match(@@matcher)
      end

      def url
        domain = uri.host
        question_id = match[:question_id]
        answer_id = match[:answer_id2] || match[:answer_id1]

        if answer_id
          "https://api.stackexchange.com/2.2/answers/#{answer_id}?site=#{domain}&filter=!.FjueITQdx6-Rq3Ue9PWG.QZ2WNdW"
        else
          "https://api.stackexchange.com/2.2/questions/#{question_id}?site=#{domain}&filter=!5-duuxrJa-iw9oVvOA(JNimB5VIisYwZgwcfNI"
        end
      end

      def data
        return @data if defined?(@data)

        result = raw['items'][0]
        if result
          result['creation_date'] =
              Time.at(result['creation_date'].to_i).strftime("%I:%M%p - %d %b %y %Z")

          result['tags'] = result['tags'].take(4).join(', ')
          result['is_answer'] = result.key?('answer_id')
          result['is_question'] = result.key?('question_id')
        end

        @data = result
      end
    end
  end
end