Lambda function for slack chat -> Printfection API

handler.rb

require "json"
require "rest-client"
require "honeybadger"

def command_parser(message)
  case message
  when /shirt/i
    response = RestClient.post("https://#{ENV["PRINTFECTION_TOKEN"]}:@api.printfection.com/v2/orders",
      JSON.dump({campaign_id: ENV["PRINTFECTION_SHIRT_CAMPAIGN"]}),
      {content_type: :json, accept: :json})
    "Go here to get your shirt: #{JSON.parse(response.body)["url"]}"
  else
    "Sorry, I dont know how to respond to that"
  end
end

def tell_slack(channel, message)
  RestClient.post("https://slack.com/api/chat.postMessage", {token: ENV["OAUTH_TOKEN"], channel: channel, text: message})
end

def handler(event:, context:)
  data = JSON.parse(event["body"])

  # This is sent when slack is verifying the bot URL during setup
  return {statusCode: 200, body: data["challenge"]} if data["challenge"]

  return {statusCode: 403, body: "Invalid token"} if data["token"].nil? || data["token"] != ENV["SLACK_TOKEN"]

  slack_event = data["event"]

  # Ignore events generated by the bot or non-text events
  if slack_event["bot_id"].nil? && slack_event["text"]
    reply = command_parser(slack_event["text"].sub(%r{(<@\w+> )?}, ""))
    tell_slack(slack_event["channel"], reply)
  end

  {statusCode: 200, body: "OK"}
rescue => e
  tell_slack(slack_event["channel"], "Got error: #{e}")
  Honeybadger.notify(e)

  {statusCode: 500, body: e.message}
end