Ruby wrapper for public Nest API

gistfile1.rb

require 'excon'
require 'json'
require 'uri'

module NestAPI
  VERSION = '0.0.1'

  class Default
    def initialize(token)
      @token = token
    end

    def url
      URI.parse('https://developer-api.nest.com')
    end

    def query
      {
        auth: @token
      }
    end

    def headers
      {
        'User-Agent' => "NestAPI LIFX v#{VERSION}",
        'Accept' => 'application/json'
      }
    end

    def middlewares
      Excon.defaults[:middlewares] + [Excon::Middleware::RedirectFollower]
    end
  end

  class Error < StandardError
  end

  class Session
    def initialize(token)
      @default = Default.new(token)
    end

    def structures
      (tree['structures'] ||= {}).keys.map do |id|
        Structure.new(id, @default, tree)
      end
    end

    private

    def tree
      return @tree if @tree

      expected = 200
      response = Excon.get(@default.url.to_s, {
        query: URI.encode_www_form(@default.query),
        headers: @default.headers,
        middlewares: @default.middlewares
      })
      if response.status == expected
        @tree = JSON.parse(response.body)
      else
        raise Error, "Nest failed to retrieve data. Expected #{expected}, got #{response.status}. Response: #{response.body}"
      end
    end
  end

  class Structure
    def initialize(id, default, tree)
      @id = id
      @default = default
      @tree = tree
    end

    def id
      @id
    end

    def away
      ref['away']
    end

    def away=(new_value)
      expected = 200
      response = Excon.put("#{@default.url.to_s}/structures/#{@id}", {
        body: JSON.dump(away: new_value),
        query: URI.encode_www_form(@default.query),
        headers: @default.headers,
        middlewares: @default.middlewares
      })
      if response.status == expected
        ref['away'] = new_value
      else
        raise Error, "Nest failed to update structure. Expected #{expected}, got #{response.status}. Response: #{response.body}"
      end
    end

    private

    def ref
      @tree['structures'][@id]
    end
  end
end