Fix slack service with label filter on issue event

app/models/project_services/chat_notification_service.rb

@@ -92,14 +92,14 @@ class ChatNotificationService < Integration
   def execute(data)
     return unless supported_events.include?(data[:object_kind])
 
-    return unless notify_label?(data)
-
     return unless webhook.present?
 
     object_kind = data[:object_kind]
 
     data = custom_data(data)
 
+    return unless notify_label?(data)
+
     # WebHook events often have an 'update' event that follows a 'open' or
     # 'close' action. Ignore update events for now to prevent duplicate
     # messages from arriving.
@@ -156,9 +156,9 @@ class ChatNotificationService < Integration
   def notify_label?(data)
     return true unless SUPPORTED_EVENTS_FOR_LABEL_FILTER.include?(data[:object_kind]) && labels_to_be_notified.present?
 
-    labels = data.dig(:issue, :labels) || data.dig(:merge_request, :labels)
+    labels = data[:labels] || data.dig(:issue, :labels) || data.dig(:merge_request, :labels) || data.dig(:object_attributes, :labels)
 
-    return false if labels.nil?
+    return false if labels.blank?
 
     matching_labels = labels_to_be_notified_list & labels.pluck(:title)
 
@@ -179,7 +179,7 @@ class ChatNotificationService < Integration
   end
 
   def custom_data(data)
-    data.merge(project_url: project_url, project_name: project_name)
+    data.merge(project_url: project_url, project_name: project_name).with_indifferent_access
   end
 
   def get_message(object_kind, data)

spec/models/project_services/chat_notification_service_spec.rb

@@ -89,12 +89,6 @@ RSpec.describe ChatNotificationService do
 
       let(:data) { Gitlab::DataBuilder::Note.build(note, user) }
 
-      it 'notifies the chat service' do
-        expect(chat_service).to receive(:notify).with(any_args)
-
-        chat_service.execute(data)
-      end
-
       shared_examples 'notifies the chat service' do
         specify do
           expect(chat_service).to receive(:notify).with(any_args)
@@ -111,6 +105,26 @@ RSpec.describe ChatNotificationService do
         end
       end
 
+      it_behaves_like 'notifies the chat service'
+
+      context 'with label filter' do
+        subject(:chat_service) { described_class.new(labels_to_be_notified: '~Bug') }
+
+        it_behaves_like 'notifies the chat service'
+
+        context 'MergeRequest events' do
+          let(:data) { create(:merge_request, labels: [label]).to_hook_data(user) }
+
+          it_behaves_like 'notifies the chat service'
+        end
+
+        context 'Issue events' do
+          let(:data) { issue.to_hook_data(user) }
+
+          it_behaves_like 'notifies the chat service'
+        end
+      end
+
       context 'when labels_to_be_notified_behavior is not defined' do
         subject(:chat_service) { described_class.new(labels_to_be_notified: label_filter) }