Billing (#1269)

* Change env SELF_HOSTING_ENABLED to SELF_HOSTED

* Initial Stripe implementation

* Fix portal link

* Use webhook signatures

* Migrated to new Stripe gem conventions

Also updated resource routing

* Added faraday-multipart gem to resolve middleware notice

* Merge fix

* Merge fix

* Temporary upgrade prompt for early access

* Lint fix

* i18n fixes

* Remove catch-all rescue

* Update .env.example

app/controllers/subscriptions_controller.rb

@@ -0,0 +1,36 @@
+class SubscriptionsController < ApplicationController
+  def new
+    client = Stripe::StripeClient.new(ENV["STRIPE_SECRET_KEY"])
+
+    if Current.family.stripe_customer_id.blank?
+      customer = client.v1.customers.create(
+        email: Current.family.primary_user.email,
+        metadata: { family_id: Current.family.id }
+      )
+      Current.family.update(stripe_customer_id: customer.id)
+    end
+
+    session = client.v1.checkout.sessions.create({
+      customer: Current.family.stripe_customer_id,
+      line_items: [ {
+        price: ENV["STRIPE_PLAN_ID"],
+        quantity: 1
+      } ],
+      mode: "subscription",
+      success_url: settings_billing_url,
+      cancel_url: settings_billing_url
+    })
+
+    redirect_to session.url, allow_other_host: true, status: :see_other
+  end
+
+  def show
+    client = Stripe::StripeClient.new(ENV["STRIPE_SECRET_KEY"])
+
+    portal_session = client.v1.billing_portal.sessions.create(
+      customer: Current.family.stripe_customer_id,
+      return_url: settings_billing_url
+    )
+    redirect_to portal_session.url, allow_other_host: true, status: :see_other
+  end
+end