chore: add support for external frontend URL in environment configuration

.env.example

@@ -258,6 +258,9 @@ AZURE_APP_SECRET=
 # contact_inboxes with no conversation older than 90 days will be removed
 # REMOVE_STALE_CONTACT_INBOX_JOB_STATUS=false
 
+# NOTE: Useful when running inside docker-compose network to link to external domain
+FRONTEND_URL_EXTERNAL=
+
 # Baileys API Whatsapp provider
 BAILEYS_PROVIDER_DEFAULT_CLIENT_NAME=Chatwoot
 BAILEYS_PROVIDER_DEFAULT_URL=http://localhost:3025

app/helpers/frontend_urls_helper.rb

@@ -1,6 +1,7 @@
 module FrontendUrlsHelper
   def frontend_url(path, **query_params)
     url_params = query_params.blank? ? '' : "?#{query_params.to_query}"
-    "#{root_url}app/#{path}#{url_params}"
+    host = ENV.fetch('FRONTEND_URL_EXTERNAL', root_url)
+    "#{host}app/#{path}#{url_params}"
   end
 end

spec/helpers/frontend_urls_helper_spec.rb

@@ -13,5 +13,13 @@ describe FrontendUrlsHelper do
         expect(helper.frontend_url('dashboard', p1: 'p1', p2: 'p2')).to eq 'http://test.host/app/dashboard?p1=p1&p2=p2'
       end
     end
+
+    context 'with set FRONTEND_URL_EXTERNAL' do
+      it 'creates path correctly' do
+        with_modified_env 'FRONTEND_URL_EXTERNAL' => 'http://external.url/' do
+          expect(helper.frontend_url('dashboard')).to eq 'http://external.url/app/dashboard'
+        end
+      end
+    end
   end
 end