Move DFC API request logic to service object

I'm planning to add more to it.

app/controllers/admin/dfc_product_imports_controller.rb

@@ -20,7 +20,7 @@ module Admin
 
       catalog_url = params.require(:catalog_url)
 
-      json_catalog = fetch_catalog(catalog_url)
+      json_catalog = DfcRequest.new(spree_current_user).get(catalog_url)
       graph = DfcIo.import(json_catalog)
 
       # * First step: import all products for given enterprise.
@@ -34,29 +34,6 @@ module Admin
 
     private
 
-    def fetch_catalog(url)
-      connection = Faraday.new(
-        request: { timeout: 30 },
-        headers: {
-          'Content-Type' => 'application/json',
-          'Authorization' => "Bearer #{spree_current_user.oidc_account.token}",
-        }
-      )
-      response = only_public_connections do
-        connection.get(url)
-      end
-
-      response.body
-    end
-
-    def only_public_connections
-      return yield if Rails.env.development?
-
-      PrivateAddressCheck.only_public_connections do
-        yield
-      end
-    end
-
     # Most of this code is the same as in the DfcProvider::SuppliedProductsController.
     def import_product(subject, enterprise)
       return unless subject.is_a? DataFoodConsortium::Connector::SuppliedProduct

engines/dfc_provider/app/services/dfc_request.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require "private_address_check"
+require "private_address_check/tcpsocket_ext"
+
+# Request a JSON document from a DFC API with authentication.
+class DfcRequest
+  def initialize(user)
+    @user = user
+  end
+
+  def get(url)
+    connection = Faraday.new(
+      request: { timeout: 30 },
+      headers: {
+        'Content-Type' => 'application/json',
+        'Authorization' => "Bearer #{@user.oidc_account.token}",
+      }
+    )
+    response = only_public_connections do
+      connection.get(url)
+    end
+
+    response.body
+  end
+
+  private
+
+  def only_public_connections(&)
+    return yield if Rails.env.development?
+
+    PrivateAddressCheck.only_public_connections(&)
+  end
+end