Quick start file for an API client in Ruby

api_client.rb

class ApiClient
  attr_accessor :api_key

  def initialize(api_key: nil)
    @api_key = api_key
  end

  def some_method
    path = "/some_path"
    get_json!(path)
  end

  private

  def authorize_request(request)
    request["Authorization"] = "Bearer #{ api_key }"
  end

  def base_uri
    @base_uri ||= URI("https://apiurl.com")
  end

  def get_json!(path)
    request = Net::HTTP::Get.new(path)
    response_json(run_request!(request))
  end

  def http
    @http ||= begin
      http = Net::HTTP.new(base_uri.host, base_uri.port)
      if base_uri.scheme == "https"
        http.use_ssl = true
      end
      http
    end
  end

  def json_headers
    @json_headers ||= { "Content-Type" => "application/json" }
  end

  def post_json!(path, body = {}, headers = {})
    request = Net::HTTP::Post.new(path)

    json_headers.merge(headers).each{ |k,v| request[k] = v }
    request.body = body.to_json

    response_json(run_request!(request))
  end

  def response_json(response)
    JSON.parse(response.body)
  rescue
    nil
  end

  def run_request(request)
    authorize_request(request)
    http.request(request)
  end

  def run_request!(request)
    response = run_request(request, target: target)
    unless response.kind_of?(Net::HTTPSuccess)
      raise "Got #{ response.code } for request: #{ request.path }: #{ response.body }"
    end
    response
  end

end