discourse/lib/oneboxer/stack_exchange_onebox.rb

require_dependency 'oneboxer/handlebars_onebox'

module Oneboxer
  class StackExchangeOnebox < HandlebarsOnebox
    DOMAINS = [
      'stackexchange',
      'stackoverflow',
      'superuser',
      'serverfault',
      'askubuntu'
    ]

    # http://rubular.com/r/V3T0I1VTPn
    REGEX =
      /^http:\/\/(?:(?<subdomain>\w*)\.)?(?<domain>#{DOMAINS.join('|')})\.com\/(?:questions|q)\/(?<question>\d*)/

    matcher REGEX
    favicon 'stackexchange.png'

    def translate_url
      @url.match(REGEX) do |match|
        site = if match[:domain] == 'stackexchange'
          match[:subdomain]
        else
          match[:domain]
        end

        ["http://api.stackexchange.com/2.1/",
         "questions/#{match[:question]}",
         "?site=#{site}"
        ].join
      end
    end

    def parse(data)
      result = JSON.parse(data)['items'].first

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

      result['tags'] = result['tags'].take(4).join(', ')

      result
    end
  end
end