# OmniAuth Qualtrics [![Build Status](https://travis-ci.org/atomicjolt/omniauth-qualtrics.svg?branch=master)](https://travis-ci.org/atomicjolt/omniauth-qualtrics) Gem to authenticate with Qualtrics via OAuth2 # Setup Contact Qualtrics administrator to get an OAuth key and secret and OAuth endpoint https://api.qualtrics.com/instructions/docs/Instructions/oauth-authentication-authorization-code.md **NOTE**: you will need to set `env['rack.session']['oauth_site']` to the current Qualtrics instance that you wish to OAuth with. By default this is https://co1.qualtrics.com -- OR -- to dynamically set the qualtrics site url do one of the following. ## Standard setup ```ruby use OmniAuth::Builder do provider :qualtrics, 'qualtrics_key', 'qualtrics_secret', :setup => lambda{|env| request = Rack::Request.new(env) env['omniauth.strategy'].options[:client_options].site = env['rack.session']['oauth_site'] } end ``` ## Setup with Devise ```ruby config.omniauth :qualtrics, 'qualtrics_key', 'qualtrics_secret', :setup => lambda{|env| request = Rack::Request.new(env) env['omniauth.strategy'].options[:client_options].site = env['rack.session']['oauth_site'] } ``` ## Alternative Setup In this setup, you do not have to set `env['rack.session']['oauth_site']` ```ruby Rails.application.config.middleware.use OmniAuth::Builder do provider :qualtrics, APP_CONFIG['qualtrics_client_id'], APP_CONFIG['qualtrics_client_secret'], { :client_options => { :site => APP_CONFIG['qualtrics_host'] } } end ``` # State In most cases your application will need to restore state after handling the OAuth process with Qualtrics. Since many applications that integrate with Qualtrics will be launched via the LTI protocol inside of an iframe sessions may not be available. To restore application state the omniauth-qualtrics gem uses the "state" parameter provided by the LTI proctocol. You will need to add the following code to your application to take advantage of this functionality: Add the following initializer in `config/initializers/omniauth.rb`: ```ruby OmniAuth.config.before_request_phase do |env| request = Rack::Request.new(env) state = "#{SecureRandom.hex(24)}#{DateTime.now.to_i}" OauthState.create!(state: state, payload: request.params.to_json) env["omniauth.strategy"].options[:authorize_params].state = state # Bye default omniauth will store all params in the session. The code above # stores the values in the database so we remove the values from the session # since the amount of data in the original params object will overflow the # allowed cookie size env["rack.session"].delete("omniauth.params") end ``` Add the following middleware to `lib/middlware/oauth_state_middleware.rb`: ```ruby class OauthStateMiddleware def initialize(app) @app = app end def call(env) request = Rack::Request.new(env) if request.params["state"] && request.params["code"] if oauth_state = OauthState.find_by(state: request.params["state"]) # Restore the param from before the OAuth dance state_params = JSON.parse(oauth_state.payload) || {} state_params.each do |key, value| request.update_param(key, value) end application_instance = ApplicationInstance.find_by(lti_key: state_params["oauth_consumer_key"]) env["qualtrics.url"] = application_instance.lti_consumer_uri oauth_state.destroy else raise OauthStateMiddlewareException, "Invalid state in OAuth callback" end end @app.call(env) end end class OauthStateMiddlewareException < RuntimeError end ``` This middleware relies upon two models - OauthState and ApplicationInstance. OauthState is used to store relevant state before sending the user to Qualtrics to finish the OAuth. ApplicationInstance is model used in Atomic Jolt projects that is used to store the Qualtrics Url so that it can be reset in the environment. You don't need to implement the same model, but you will need to store the user's Qualtrics URL somewhere before sending the user to OAuth with Qualtrics. Change the following lines in the above code to recover the Qualtrics URL from where ever it is stored: ``` application_instance = ApplicationInstance.find_by(lti_key: state_params["oauth_consumer_key"]) env["qualtrics.url"] = application_instance.lti_consumer_uri ``` The OauthState model looks like this: ``` class OauthState < ActiveRecord::Base validates :state, presence: true, uniqueness: true end ``` With the following schema: ``` create_table "oauth_states", force: :cascade do |t| t.string "state" t.text "payload" t.datetime "created_at", null: false t.datetime "updated_at", null: false t.index ["state"], name: "index_oauth_states_on_state", using: :btree end ``` Last, enable the middleware by adding the following to `config/application.rb`: ```ruby # Middleware that can restore state after an OAuth request config.middleware.insert_before 0, "OauthStateMiddleware" ``` # License Copyright (C) 2012-2021 Atomic Jolt. 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