slack_notifier.rb

# this class will send notifications to your slack team via a webhook
# setup the webhook here: https://slack.com/apps/A0F7XDUAZ-incoming-webhooks
class SlackNotifier
  # constructor
  # use as: SlackNotifier.new "YOUR-URL"
  def initialize(webhook_url, channel = false, username = "SlackNotifier", icon_emoji = ":ghost:")
    @webhook_url = webhook_url
    @channel = channel
    @username = username
    @icon_emoji = icon_emoji
  end

  # sends a notification
  # returns true after a successfull pust
  def send(text)
    # send as json
    headers = { 'Content-Type' => 'application/json' }
    # payload
    body = { "text": text, "icon_emoji": @icon_emoji, username: @username}
    # add the channel if there is one
    # otherwise the default channel from the slack integration will be used 
    if @channel
      body["channel"] = @channel
    end

    # rescue from request errors
    begin
      # make request
      r = HTTParty.post(@webhook_url, body: body.to_json, headers: headers )
      return (r.code == 200)
    rescue
      return false
    end
  end
end