AWS Lambda Ruby script to get cat status from the SureFlap cat flap. Very rough-and-ready. Intended to be used with an iOS shortcut to get cat status.

README.md

AWS Lambda Ruby script to get cat status from the SureFlap cat flap. Very rough-and-ready.

Intended to be used with an iOS shortcut to get cat status – see https://twitter.com/henrik/status/1321201656822943745 for a screenshot of the shortcut.

This is not a tutorial, just some public notes for my own future use.

Setup hints

Create this as a AWS Lambda running on Ruby.

The script is self-contained with no Gem dependencies, so it can be added via the web UI editor.

Add ENVs – see the top of the script.

Set up a public Lambda Function URL.

Would be nice but will probably never happen

• Better kind of auth
• Better docs

lambda_function.rb

KEY = ENV.fetch("KEY")
LOGIN = ENV.fetch("LOGIN")
PW = ENV.fetch("PW")
PET_ID = ENV.fetch("PET_ID")  # I got this via my https://github.com/matryer/bitbar-plugins/blob/master/Lifestyle/sureflap.15s.rb.
PET_NAME = ENV.fetch("PET_NAME")
TZ = ENV.fetch("TZ")  # Your preferred timezone – try `require "time"; Time.now.zone` to see its name in a format that Ruby recognises.

require "net/http"
require "json"
require "time"

def lambda_handler(event:, context:)
  key = event.dig("queryStringParameters", "key")
  return { statusCode: 403, body: "Denied! Wrong 'key'." }  unless key == KEY
  
  # Get token.
  uri = URI.parse("https://app.api.surehub.io/api/auth/login")
  req = Net::HTTP::Post.new(uri, "Content-Type" => "application/json")
  req.body = { email_address: LOGIN, password: PW, device_id: "0" }.to_json
  res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(req) }
  token = JSON.parse(res.body).dig("data", "token")
  
  # Use token to get status.
  uri = URI.parse("https://app.api.surehub.io/api/pet/#{PET_ID}/position")
  req = Net::HTTP::Get.new(uri, "Content-Type" => "application/json", "Authorization" => "Bearer #{token}")
  res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(req) }
  data = JSON.parse(res.body).fetch("data")
  
  since = Time.at(Time.parse(data.fetch("since")) + Time.zone_offset(TZ)).strftime("%H:%M")  # Convert from UTC to desired timezone.
  output = "#{PET_NAME} is #{data.fetch("where") == 1 ? "home" : "out and about"} since #{since}."
  
  { statusCode: 200, body: output }
end