Service for watch Dropbox folder on linux & send notifications to Slack if new files added

watcher.rb

#!/home/RUBYUSER/.rvm/rubies/ruby-2.3.0/bin/ruby

require 'rubygems'
require 'rb-inotify'
require 'slack-notifier'

watcher  = INotify::Notifier.new
notifier = Slack::Notifier.new "https://hooks.slack.com/services/SLACKWEBHOOKURL"
notifier.channel  = '#CHANNEL_NAME'

watcher.watch("/home/RUBYUSER/Dropbox/", :create, :delete, :recursive) do |event|
  event.flags.each do |flag|
    flag = flag.to_s

    case flag
    when 'create'
      if File.extname(event.name) == '.JPG' || File.extname(event.name) == '.JPEG' || File.extname(event.name) == '.jpg' || File.extname(event.name) == '.jpeg'
        message = "New file http://SERVERNAME/#{event.absolute_name.sub( '/home/RUBYUSER/Dropbox/', '')}"
        notifier.ping message
        puts message
      end
    when 'delete'
      puts "Deleted file #{event.absolute_name}"
    else
    end
  end
end

## loop, wait for events from inotify
watcher.run