endpoint.rb

require 'json'
require 'net/http'
require 'uri'
require 'webrick'

class Receiver
  def initialize(pattern, slack_endpoint)
    @pattern = pattern
    @endpoint = slack_endpoint
  end

  def start
    server = WEBrick::HTTPServer.new(:Port => 8080)
    server.mount_proc '/' do |req, res|
      data = JSON.parse(req.body)

      case data['object_kind']
      when 'issue', 'merge_request'
        if data['object_attributes']['title'] =~ @pattern ||
           data['object_attributes']['description'] =~ @pattern
          notify
        end
      when 'note'
        if data['object_attributes']['note'] =~ @pattern
          notify
        end
      end
    end

    trap 'INT' do
      server.shutdown
    end
    server.start
  end


  private

  def notify
    uri = URI.parse(@endpoint)
    request = Net::HTTP::Post.new(uri.request_uri)
    request.body = 'もし再起動するならあれもやりたい'

    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = true
    http.start {|h| h.request(request) }
  end
end


Receiver.new(/再起動|reboot/, 'https://codeance.slack.com/services/hooks/slackbot?token=ccvIktQ90VrBP03gzsA6WsJK&channel=%23test').start