client.rb

#!/usr/bin/env ruby

require 'uri'
require 'net/http'
require 'json'
require 'http-cookie'

module Uck
  class Client
    attr_reader :baseurl
    attr_reader :uri
    attr_reader :cookies

    def initialize(baseurl)
      self.baseurl = baseurl
    end

    def baseurl=(url)
      @baseurl = url
      self.uri = URI.parse(baseurl)
      @cookies = nil
    end

    def uri=(uri)
      @uri = uri
      # TODO: resolve @uri.host via gateway if it does not resolve on its own
      @http = Net::HTTP.new(@uri.host, @uri.port)
      if @uri.scheme == 'https'
        require 'net/https'
        @http.use_ssl = true
        @http.verify_mode = OpenSSL::SSL::VERIFY_NONE  # TODO: make optional
      end
    end

    def login(username, password)
      uri = @uri.dup
      uri.path = '/api/login'
      data = { username: username, password: password }
      request = Net::HTTP::Post.new(uri.path)
      request['content-type'] = 'application/json'
      request.body = data.to_json
      response = @http.request(request)
      if response.code != '200' || response.body.nil? || response.body.empty?
        nil  # TODO: flag error
      else
        data = JSON.parse(response.body)  # TODO: catch exception
        if data && data.key?('meta') && data['meta'].key?('rc') &&
           data['meta']['rc'] == 'ok'
          if response.key?('set-cookie')
            jar = HTTP::CookieJar.new
            jar.parse(response['set-cookie'], uri)
            @cookies = HTTP::Cookie.cookie_value(jar.cookies(uri))
          end
          # TODO: flag error if no Set-Cookie header
        end
        # TODO: flag error if response body lacks meta.rc == ok
      end
      # Return true if cookies were successfully saved
      !(@cookies.nil? || @cookies.empty?)
    end

    def get(endpoint)
      uri = @uri.dup
      uri.path = endpoint.match('\A/') ? endpoint : '/' + endpoint
      request = Net::HTTP::Get.new(uri.request_uri)
      request['cookie'] = @cookies if !(@cookies.nil? || @cookies.empty?)
      response = @http.request(request)
      # TODO: throw error for unsuccessful response
      # TODO: catch and promote error if no cookies and permission denied
      data = JSON.parse(response.body)
      # TODO: catch parse exception and log body before re-throwing
      data
    end
  end
end