Make PagerDuty::ProcessWebhookService user-less service

Avoid passing `nil` as a user to the `PagerDuty::ProcessWebhookService`

app/controllers/projects/incident_management/pager_duty_incidents_controller.rb

@@ -26,7 +26,7 @@ module Projects
       end
 
       def webhook_processor
-        ::IncidentManagement::PagerDuty::ProcessWebhookService.new(project, nil, payload)
+        ::IncidentManagement::PagerDuty::ProcessWebhookService.new(project, payload)
       end
 
       def payload

app/services/incident_management/pager_duty/process_webhook_service.rb

@@ -2,7 +2,7 @@
 
 module IncidentManagement
   module PagerDuty
-    class ProcessWebhookService < BaseService
+    class ProcessWebhookService
       include Gitlab::Utils::StrongMemoize
       include IncidentManagement::Settings
 
@@ -12,6 +12,11 @@ module IncidentManagement
       # https://developer.pagerduty.com/docs/webhooks/v2-overview/#webhook-types
       PAGER_DUTY_PROCESSABLE_EVENT_TYPES = %w(incident.trigger).freeze
 
+      def initialize(project, payload)
+        @project = project
+        @payload = payload
+      end
+
       def execute(token)
         return forbidden unless webhook_setting_active?
         return unauthorized unless valid_token?(token)
@@ -24,6 +29,8 @@ module IncidentManagement
 
       private
 
+      attr_reader :project, :payload
+
       def process_incidents
         pager_duty_processable_events.each do |event|
           ::IncidentManagement::PagerDuty::ProcessIncidentWorker.perform_async(project.id, event['incident'])
@@ -33,7 +40,7 @@ module IncidentManagement
       def pager_duty_processable_events
         strong_memoize(:pager_duty_processable_events) do
           ::PagerDuty::WebhookPayloadParser
-            .call(params.to_h)
+            .call(payload.to_h)
             .filter { |msg| msg['event'].to_s.in?(PAGER_DUTY_PROCESSABLE_EVENT_TYPES) }
         end
       end
@@ -47,7 +54,7 @@ module IncidentManagement
       end
 
       def valid_payload_size?
-        Gitlab::Utils::DeepSize.new(params, max_size: PAGER_DUTY_PAYLOAD_SIZE_LIMIT).valid?
+        Gitlab::Utils::DeepSize.new(payload, max_size: PAGER_DUTY_PAYLOAD_SIZE_LIMIT).valid?
       end
 
       def accepted

spec/requests/projects/incident_management/pagerduty_incidents_spec.rb

@@ -23,7 +23,7 @@ RSpec.describe 'PagerDuty webhook' do
     it 'calls PagerDuty webhook processor with correct parameters' do
       make_request
 
-      expect(webhook_processor_class).to have_received(:new).with(project, nil, payload)
+      expect(webhook_processor_class).to have_received(:new).with(project, payload)
       expect(webhook_processor).to have_received(:execute).with('VALID-TOKEN')
     end
 

spec/services/incident_management/pager_duty/process_webhook_service_spec.rb

@@ -17,7 +17,7 @@ RSpec.describe IncidentManagement::PagerDuty::ProcessWebhookService do
     let(:webhook_payload) { Gitlab::Json.parse(fixture_file('pager_duty/webhook_incident_trigger.json')) }
     let(:token) { nil }
 
-    subject(:execute) { described_class.new(project, nil, webhook_payload).execute(token) }
+    subject(:execute) { described_class.new(project, webhook_payload).execute(token) }
 
     context 'when PagerDuty webhook setting is active' do
       let_it_be(:incident_management_setting) { create(:project_incident_management_setting, project: project, pagerduty_active: true) }