Migrating a QuickBooks Online App from OAuth1 to OAuth2 using the qbo_api gem - Step 2

Show notes:

• Add gem 'rack-oauth2' to Gemfile
• Enable OAuth2 on your app at https://developer.intuit.com and set the redirect URI and grab the client_id and client_secret.

config/routes.rb

  get '/oauth2-redirect', to: 'visitors#oauth2_redirect'

app/models/qbo/oauth2.rb

app/controllers/visitors_controller.rb

class VisitorsController < ApplicationController  skip_before_action :authenticate_user!, :except => [:oauth2_redirect]

    def oauth2_redirect
        qbo_account = current_account.qbo_account
        if params[:state] == session[:oauth2_state] && qbo_account
            client = Qbo::OAuth2.client
            client.authorization_code = params[:code]
            if resp = client.access_token!
                attrs = {
                    access_token: resp.access_token,
                    refresh_token: resp.refresh_token,
                    companyid: params[:realmId]
                }.merge(Qbo::OAuth2.expires_in)
                qbo_account.update!(attrs)
                msg = "Your QuickBooks account has been successfully linked."
                flash[:inner_notice] = msg
                render 'shared/close_and_redirect', layout: 'basic'
            end
        end
    rescue => e
        @url = account_url(current_account)
        msg = "There was a problem linking Your QuickBooks account - given an error: #{e.message}"
        logger.warn msg
        flash[:alert] = msg
        render 'shared/close_and_redirect', layout: 'basic'
    end
end

app/controllers/application_controller.rb

  
def set_oauth2_state
    session[:oauth2_state] = Rails.env.test? ? '3242adf32423kjo' : SecureRandom.uuid
end
helper_method :set_oauth2_state

config/initializers/inflectors.rb

ActiveSupport::Inflector.inflections(:en) do |inflect|  
  inflect.acronym 'OAuth2'
end

view code

<% content_for :script do %>
  intuit.ipp.anywhere.setup({ grantUrl: '<%= Qbo::OAuth2.authorize_url(state: set_oauth2_state).html_safe %>',
                              datasources: { quickbooks : true, payments : false }
                            });
<% end %>