Allow case insensitive domains for service_email_output (#2467)

* Allow case insensitive domains for service_email_output

Gemfile.lock

@@ -180,6 +180,7 @@ GEM
     ffi (1.16.3)
     globalid (1.2.1)
       activesupport (>= 6.1)
+    google-protobuf (3.24.4)
     google-protobuf (3.24.4-x86_64-darwin)
     google-protobuf (3.24.4-x86_64-linux)
     googleapis-common-protos-types (1.9.0)
@@ -284,6 +285,7 @@ GEM
       sprockets-rails
     method_source (1.0.0)
     mini_mime (1.1.5)
+    mini_portile2 (2.8.5)
     minitest (5.20.0)
     msgpack (1.7.2)
     multi_json (1.15.0)
@@ -299,6 +301,9 @@ GEM
     net-smtp (0.4.0)
       net-protocol
     nio4r (2.5.9)
+    nokogiri (1.15.4)
+      mini_portile2 (~> 2.8.2)
+      racc (~> 1.4)
     nokogiri (1.15.4-x86_64-darwin)
       racc (~> 1.4)
     nokogiri (1.15.4-x86_64-linux)
@@ -728,6 +733,7 @@ GEM
     zeitwerk (2.6.12)
 
 PLATFORMS
+  ruby
   x86_64-darwin-20
   x86_64-darwin-21
   x86_64-linux

app/validators/domain_validator.rb

@@ -1,7 +1,7 @@
 class DomainValidator < ActiveModel::EachValidator
   def validate_each(record, attribute, value)
     domain = value.split('@').last
-    if value.present? && !domain.in?(Rails.application.config.allowed_domains)
+    if value.present? && !domain.downcase.in?(Rails.application.config.allowed_domains)
       record.errors.add(
         attribute,
         I18n.t("activemodel.errors.models.#{record.model_name.singular}.domain_invalid")

spec/models/email_settings_spec.rb

@@ -27,6 +27,12 @@
         ).for(:service_email_output)
       end
 
+      it 'allows domains case insensitive' do
+        should allow_values(
+          '[email protected]'
+        ).for(:service_email_output)
+      end
+
       it 'do not allow malformed emails' do
         should_not allow_values(
           'organa', 'leia'