fix: Locale not correct in root url when accessing help center with custom domain (#9110)

- Ensuring that SwitchLocale concern handles the case of custom domain for portals and set locale according to that

Co-authored-by: Sojan Jose <sojan@pepalo.com>

app/controllers/concerns/domain_helper.rb

@@ -0,0 +1,5 @@
+module DomainHelper
+  def self.chatwoot_domain?(domain = request.host)
+    [URI.parse(ENV.fetch('FRONTEND_URL', '')).host, URI.parse(ENV.fetch('HELPCENTER_URL', '')).host].include?(domain)
+  end
+end

app/controllers/concerns/switch_locale.rb

@@ -6,6 +6,7 @@ module SwitchLocale
   def switch_locale(&)
     # priority is for locale set in query string (mostly for widget/from js sdk)
     locale ||= locale_from_params
+    locale ||= locale_from_custom_domain
     # if locale is not set in account, let's use DEFAULT_LOCALE env variable
     locale ||= locale_from_env_variable
     set_locale(locale, &)
@@ -16,6 +17,20 @@ module SwitchLocale
     set_locale(locale, &)
   end
 
+  # If the request is coming from a custom domain, it should be for a helpcenter portal
+  # We will use the portal locale in such cases
+  def locale_from_custom_domain(&)
+    return if params[:locale]
+
+    domain = request.host
+    return if DomainHelper.chatwoot_domain?(domain)
+
+    @portal = Portal.find_by(custom_domain: domain)
+    return unless @portal
+
+    @portal.default_locale
+  end
+
   def set_locale(locale, &)
     # if locale is empty, use default_locale
     locale ||= I18n.default_locale

app/controllers/dashboard_controller.rb

@@ -18,6 +18,7 @@ class DashboardController < ActionController::Base
       'LOGO', 'LOGO_DARK', 'LOGO_THUMBNAIL',
       'INSTALLATION_NAME',
       'WIDGET_BRAND_URL', 'TERMS_URL',
+      'BRAND_URL', 'BRAND_NAME',
       'PRIVACY_URL',
       'DISPLAY_MANIFEST',
       'CREATE_NEW_ACCOUNT_FROM_DASHBOARD',

app/controllers/public/api/v1/portals/base_controller.rb

@@ -47,7 +47,7 @@ class Public::Api::V1::Portals::BaseController < PublicController
     @locale = if article.category.present?
                 article.category.locale
               else
-                'en'
+                article.portal.default_locale
               end
 
     I18n.with_locale(@locale, &)

app/controllers/public_controller.rb

@@ -8,8 +8,7 @@ class PublicController < ActionController::Base
 
   def ensure_custom_domain_request
     domain = request.host
-
-    return if [URI.parse(ENV.fetch('FRONTEND_URL', '')).host, URI.parse(ENV.fetch('HELPCENTER_URL', '')).host].include?(domain)
+    return if DomainHelper.chatwoot_domain?(domain)
 
     @portal = ::Portal.find_by(custom_domain: domain)
     return if @portal.present?

app/views/public/api/v1/portals/_header.html.erb

@@ -83,7 +83,7 @@
               class="w-24 overflow-hidden text-sm font-medium leading-tight bg-white appearance-none cursor-pointer dark:bg-slate-900 text-ellipsis whitespace-nowrap focus:outline-none focus:shadow-outline locale-switcher"
             >
               <% @portal.config["allowed_locales"].each do |locale| %>
-                <option <%= locale == params[:locale] ? 'selected': '' %> value="<%= locale %>"><%= "#{language_name(locale)} (#{locale})" %></option>
+                <option <%= locale == @locale ? 'selected': '' %> value="<%= locale %>"><%= "#{language_name(locale)} (#{locale})" %></option>
               <% end %>
             </select>
             <%= render partial: 'icons/chevron-down' %>