app.rb

require 'bundler'
Bundler.require
Dir[File.dirname(__FILE__) + '/lib/*.rb'].each {|file| require file }

INTERCOM_REGEX = /https:\/\/app.intercom.io\/a\/apps\/(?<app_id>\S*)\/inbox\/(\S*\/)?conversation(s)?\/(?<conversation_id>\d*)/
INTERCOM_CLIENT = IntercomApiClient.new(ENV['INTERCOM_API_KEY'])
JIRA_HOSTNAME = ENV['JIRA_HOSTNAME']

use Rack::Auth::Basic, "Restricted Area" do |username, password|
  username == ENV['APP_USERNAME'] and password == ENV['APP_PASSWORD']
end

get '/health' do
  content_type :json
  {status: 'OK'}.to_json
end

post '/jira_to_intercom' do
  content_type :json

  request.body.rewind

  begin
    data = request.body.read
    json = JSON.parse(data)
    if json.empty?
      puts 'JSON payload is empty'
      halt 500
    end
  rescue JSON::ParserError => ex
    puts 'Unable to parse JSON.', ex.inspect, data.inspect
    halt 500
  end

  jira_event = JiraEvent.new(json)

  if jira_event.supported?
    link_finder = IntercomLinkFinder.new(jira_event.content)

    # check if jira event content includes intercom conversation URL
    if link_finder.has_link?
      puts 'JIRA event includes Intercom URL'

      @result = {} # placeholder

      # get issue info
      issue = jira_event.issue

      # get convo
      # TODO: move this into background job
      conversation = INTERCOM_CLIENT.get_conversation(link_finder.conversation_id)

      puts "Conversation status code: #{conversation.code}"

      # check if convo already linked
      if conversation.code == 200

        # issue and convo already linked
        if jira_event.issue_referenced?(conversation.body)
          puts 'Issue and Conversation already linked'

          if jira_event.issue_commented?
            comment = jira_event.comment

            puts "Adding note for comment on issue #{issue.key} in Intercom..."
            # add jira comment as note in intercom
            @result = INTERCOM_CLIENT.note_conversation(
              link_finder.conversation_id,
              "#{comment.author} commented on #{issue.hyperlink}: #{comment.body}"
            )
          else
            # nothing to do here
            puts "Issue #{issue.key} already linked in Intercom"
            halt 409
          end
        else
          # not linked, let's add a link
          puts "Linking issue #{issue.key} in Intercom..."
          @result = INTERCOM_CLIENT.note_conversation(
            link_finder.conversation_id,
            "#{issue.reporter} linked a JIRA ticket: #{issue.hyperlink}"
          )
        end
      else
        puts "Intercom API call failed", conversation.inspect
        halt 500
      end

      @result.to_json
    else
      # no link, nothing to see here
      { :message => 'No Intercom link in the JIRA event' }.to_json
    end
  else
    puts "Unsupported JIRA webhook event #{jira_event.name}"
    halt 400
  end
end