Add new configuration flag for token exchange

lib/shopify_app/configuration.rb

@@ -44,6 +44,9 @@ class Configuration
     # takes a ShopifyApp::BillingConfiguration object
     attr_accessor :billing
 
+    # Work in Progress: enables token exchange authentication flow
+    attr_accessor :wip_token_exchange
+
     def initialize
       @root_url = "/"
       @myshopify_domain = "myshopify.com"
@@ -118,6 +121,10 @@ def shop_access_scopes
     def user_access_scopes
       @user_access_scopes || scope
     end
+
+    def use_token_exchange?
+      wip_token_exchange && embedded_app?
+    end
   end
 
   class BillingConfiguration

test/shopify_app/configuration_test.rb

@@ -228,4 +228,30 @@ class ConfigurationTest < ActiveSupport::TestCase
     end
     assert_equal "Invalid user access scopes strategy - expected a string", error.message
   end
+
+  test "#use_token_exchange? is true when wip_token_exchange is on for embedded apps" do
+    ShopifyApp.configure do |config|
+      config.embedded_app = true
+      config.wip_token_exchange = true
+    end
+
+    assert ShopifyApp.configuration.use_token_exchange?
+  end
+
+  test "#use_token_exchange? is false for non-embedded apps even if wip_token_exchange is configured" do
+    ShopifyApp.configure do |config|
+      config.embedded_app = false
+      config.wip_token_exchange = true
+    end
+
+    refute ShopifyApp.configuration.use_token_exchange?
+  end
+
+  test "#use_token_exchange? is false when wip_token_exchange is off" do
+    ShopifyApp.configure do |config|
+      config.wip_token_exchange = false
+    end
+
+    refute ShopifyApp.configuration.use_token_exchange?
+  end
 end