Set `resolved_on_default_branch` attribute of vulnerabilities

We are setting this value of vulnerabilities to inform the users that
the vulnerability has been disappeared with the latest pipeline.

ee/app/services/security/store_report_service.rb

@@ -18,7 +18,8 @@ module Security
       # Ensure we're not trying to insert data twice for this report
       return error("#{@report.type} report already stored for this pipeline, skipping...") if executed?
 
-      create_all_vulnerabilities!
+      vulnerability_ids = create_all_vulnerabilities!
+      mark_as_resolved_except(vulnerability_ids)
 
       success
     end
@@ -30,9 +31,14 @@ module Security
     end
 
     def create_all_vulnerabilities!
-      @report.findings.each do |finding|
-        create_vulnerability_finding(finding)
-      end
+      @report.findings.map { |finding| create_vulnerability_finding(finding).id }.uniq
+    end
+
+    def mark_as_resolved_except(vulnerability_ids)
+      project.vulnerabilities
+             .with_report_types(report.type)
+             .id_not_in(vulnerability_ids)
+             .update_all(resolved_on_default_branch: true)
     end
 
     def create_vulnerability_finding(finding)
@@ -100,7 +106,7 @@ module Security
 
     def create_vulnerability(vulnerability_finding, pipeline)
       if vulnerability_finding.vulnerability_id
-        Vulnerabilities::UpdateService.new(vulnerability_finding.project, pipeline.user, finding: vulnerability_finding).execute
+        Vulnerabilities::UpdateService.new(vulnerability_finding.project, pipeline.user, finding: vulnerability_finding, resolved_on_default_branch: false).execute
       else
         Vulnerabilities::CreateService.new(vulnerability_finding.project, pipeline.user, finding_id: vulnerability_finding.id).execute
       end

ee/app/services/vulnerabilities/update_service.rb

@@ -4,14 +4,15 @@ module Vulnerabilities
   class UpdateService
     include Gitlab::Allowable
 
-    attr_reader :project, :author, :finding
+    attr_reader :project, :author, :finding, :resolved_on_default_branch
 
     delegate :vulnerability, to: :finding
 
-    def initialize(project, author, finding:)
+    def initialize(project, author, finding:, resolved_on_default_branch: nil)
       @project = project
       @author = author
       @finding = finding
+      @resolved_on_default_branch = resolved_on_default_branch
     end
 
     def execute
@@ -30,7 +31,8 @@ module Vulnerabilities
       {
         title: finding.name,
         severity: vulnerability.severity_overridden? ? vulnerability.severity : finding.severity,
-        confidence: vulnerability.confidence_overridden? ? vulnerability.confidence : finding.confidence
+        confidence: vulnerability.confidence_overridden? ? vulnerability.confidence : finding.confidence,
+        resolved_on_default_branch: resolved_on_default_branch.nil? ? vulnerability.resolved_on_default_branch : resolved_on_default_branch
       }
     end
   end

ee/spec/services/security/store_report_service_spec.rb

@@ -135,6 +135,24 @@ RSpec.describe Security::StoreReportService, '#execute' do
       subject
       expect(vulnerability.reload).to have_attributes(severity: 'medium', title: 'Probable insecure usage of temp file/directory.', title_html: 'Probable insecure usage of temp file/directory.')
     end
+
+    context 'when the existing vulnerability is resolved with the latest report' do
+      let!(:existing_vulnerability) { create(:vulnerability, report_type: report_type, project: project) }
+
+      it 'marks the vulnerability as resolved on default branch' do
+        expect { subject }.to change { existing_vulnerability.reload[:resolved_on_default_branch] }.from(false).to(true)
+      end
+    end
+
+    context 'when the existing resolved vulnerability is discovered again on the latest report' do
+      before do
+        vulnerability.update!(resolved_on_default_branch: true)
+      end
+
+      it 'marks the vulnerability as not resolved on default branch' do
+        expect { subject }.to change { vulnerability.reload[:resolved_on_default_branch] }.from(true).to(false)
+      end
+    end
   end
 
   context 'with existing data from same pipeline' do

ee/spec/services/vulnerabilities/update_service_spec.rb

@@ -14,8 +14,9 @@ RSpec.describe Vulnerabilities::UpdateService do
   let!(:vulnerability) { create(:vulnerability, project: project, severity: :low, severity_overridden: severity_overridden, confidence: :ignore, confidence_overridden: confidence_overridden) }
   let(:severity_overridden) { false }
   let(:confidence_overridden) { false }
+  let(:resolved_on_default_branch) { nil }
 
-  subject { described_class.new(project, user, finding: updated_finding).execute }
+  subject { described_class.new(project, user, finding: updated_finding, resolved_on_default_branch: resolved_on_default_branch).execute }
 
   context 'with an authorized user with proper permissions' do
     before do
@@ -66,6 +67,20 @@ RSpec.describe Vulnerabilities::UpdateService do
       end
     end
 
+    context 'when the `resolved_on_default_branch` kwarg is provided' do
+      let(:resolved_on_default_branch) { true }
+
+      it 'updates the resolved_on_default_branch attribute of vulnerability' do
+        expect { subject }.to change { vulnerability[:resolved_on_default_branch] }.from(false).to(true)
+      end
+    end
+
+    context 'when the `resolved_on_default_branch` kwarg is not provided' do
+      it 'does not update the resolved_on_default_branch attribute of vulnerability' do
+        expect { subject }.not_to change { vulnerability[:resolved_on_default_branch] }
+      end
+    end
+
     context 'when security dashboard feature is disabled' do
       before do
         stub_licensed_features(security_dashboard: false)