DEV: Add verbose logging site setting (#230)

To aid in debugging I'm adding a verbose logging site setting. I'm
adding this because I'm currently getting some errors in production that
I'm unable to replicate locally.

See: https://meta.discourse.org/t/323450/4

app/controllers/discourse_subscriptions/hooks_controller.rb

@@ -30,6 +30,10 @@ module DiscourseSubscriptions
       case event[:type]
       when "checkout.session.completed"
         checkout_session = event[:data][:object]
+
+        if SiteSetting.discourse_subscriptions_enable_verbose_logging
+          Rails.logger.info("checkout.session.completed data: #{checkout_session}")
+        end
         email = checkout_session[:customer_email]
 
         return head 200 if checkout_session[:status] != "complete"
@@ -38,6 +42,10 @@ module DiscourseSubscriptions
 
         customer_id = checkout_session[:customer]
 
+        if SiteSetting.discourse_subscriptions_enable_verbose_logging
+          Rails.logger.info("Looking up user with email: #{email}")
+        end
+
         user = ::User.find_by_username_or_email(email)
 
         return render_json_error "customer not found" if !user

config/locales/client.en.yml

@@ -22,6 +22,7 @@ en:
     discourse_subscriptions_campaign_show_contributors: Show avatars of the most recent purchases of subscription products.
     discourse_subscriptions_campaign_product: The Stripe product id to send supporters when they click the button on the campaign. If this setting is blank, supporters will be directed to the main products page.
     discourse_subscriptions_enable_automatic_tax: Enables automatic tax calculation which will automatically compute tax rates on all invoices generated by the subscription.
+    discourse_subscriptions_enable_verbose_logging: Enables more verbose logging to aid in debugging. Please do not leave permantly enabled in production.
 
     errors:
       discourse_patrons_amount_must_be_currency: "Currency amounts must be currencies without dollar symbol (eg 1.50)"

config/settings.yml

@@ -82,3 +82,5 @@ discourse_subscriptions:
     hidden: true
   discourse_subscriptions_enable_automatic_tax:
     default: false
+  discourse_subscriptions_enable_verbose_logging:
+    default: false