Integrating Instagram(OAuth) using RubyMotion, Promotion, AFMotion and some SugarCube

instagram.rb

class Instagram < PM::WebScreen
  title "Instagram"

  CLIENT_ID       = 'your client id'
  REDIRECT_URI    = 'http://your.domain.com/auth/instagram/callback'
  FAILURE_URL     = 'http://your.domain.com/auth/failure'
  AUTH_URI        = "https://instagram.com/oauth/authorize/?client_id=#{CLIENT_ID}&redirect_uri=#{REDIRECT_URI}&response_type=token"

  class << self
    def api
      @api ||= AFMotion::Client.build_shared('https://api.instagram.com/v1/') do
        header "Accept", "application/json"
        response_serializer :json
      end
    end

    def get_user_info(access_token, &block)
      api.get('users/self', access_token: access_token) do |result|
        if result.success?
          block.call(result.object['data']) if block
        elsif result.failure?
          block.call(nil) if block
        end
      end
    end
  end

  def on_init
    super
    @external_links = true

    @activity = UIActivityIndicatorView.alloc.initWithActivityIndicatorStyle(UIActivityIndicatorViewStyleGray)
    self.view.addSubview(@activity)
    @activity.center = self.view.center
    @activity.hidesWhenStopped = true
  end

  def content
    AUTH_URI.nsurl
  end

  def load_started
    @activity.startAnimating
  end

  def load_finished
    @activity.stopAnimating
  end

  def load_failed(error)
    @activity.stopAnimating
  end

  def on_request(request, in_type)
    url = request.URL.absoluteString
    # is our redirect url?
    if url.start_with? REDIRECT_URI
      case url
      when /access_token/
        # url constains the access_token? (url second part), returning access token
        close screen: :instagram, access_token: url.split('#access_token=').last
      when /error_reason/
        # known user error
        reason = url =~ /user_denied/ ? 'User denied access' : 'Authentication failed'
        close screen: :instagram, error: reason
      else
        # unknown error
        close screen: :instagram, error: 'Unknown error'
      end
      false
    elsif url.start_with? FAILURE_URL
      # TODO: Yeah, we should do something...
      false
    end
    true # let the webview load this url
  end
end

networks_table_screen.rb

class NetworksTableScreen < PM::TableScreen
  ...

  def link_instagram
    if User.get.connected_to? :instagram
      ...
    else
      open Instagram.new(nav_bar: true)
    end
  end

  def on_return(args)
    case args[:screen]
    when :instagram
      unless args[:error]
        start_indicator("Linking your Instagram...")
        BwuitInstagram.get_user_info(args[:access_token]) do |user|
          stop_indicator
          if user
            #TODO: Do somenthing with your user basic data
            update_table_data
          else
            puts "Ups, something went wrong"
            #TODO: Error
          end
        end
      else
        UIAlertView.alert "Error linking Instagram: #{args[:error]}"
      end
    end
  end
end