Add custom domains (#314)

app/controllers/tenants_controller.rb

@@ -1,3 +1,5 @@
+require 'httparty'
+
 class TenantsController < ApplicationController
   include ApplicationHelper
 
@@ -66,6 +68,23 @@ class TenantsController < ApplicationController
     @tenant = Current.tenant_or_raise!
     authorize @tenant
 
+    # If the custom domain has changed, we need to provision SSL certificate
+    custom_domain_response = AddCustomDomainWorkflow.new(
+      new_custom_domain: params[:tenant][:custom_domain],
+      current_custom_domain: @tenant.custom_domain
+    ).run
+
+    if custom_domain_response == false
+      render json: {
+        error: "Error adding custom domain"
+      }, status: :unprocessable_entity
+      return
+    end
+
+    # Since custom_domain is unique at db level, we need to set it to nil if it is blank
+    # to avoid unique constraint violation
+    params[:tenant][:custom_domain] = nil if params[:tenant][:custom_domain].blank?
+
     if @tenant.update(tenant_update_params)
       render json: @tenant
     else