Prevent guests from seeing commits for cycle analytics

- if the user has access level lower than REPORTER,
don't include commit count in summary

changelogs/unreleased/security-ag-cycle-analytics-guest-permissions.yml

+---
+title: Hide commit counts from guest users in Cycle Analytics.
+merge_request:
+author:
+type: security

lib/gitlab/cycle_analytics/stage_summary.rb

@@ -11,13 +11,29 @@ module Gitlab
       end
 
       def data
-        [serialize(Summary::Issue.new(project: @project, from: @from, to: @to, current_user: @current_user)),
-         serialize(Summary::Commit.new(project: @project, from: @from, to: @to)),
-         serialize(Summary::Deploy.new(project: @project, from: @from, to: @to))]
+        summary = [issue_stats]
+        summary << commit_stats if user_has_sufficient_access?
+        summary << deploy_stats
       end
 
       private
 
+      def issue_stats
+        serialize(Summary::Issue.new(project: @project, from: @from, to: @to, current_user: @current_user))
+      end
+
+      def commit_stats
+        serialize(Summary::Commit.new(project: @project, from: @from, to: @to))
+      end
+
+      def deploy_stats
+        serialize(Summary::Deploy.new(project: @project, from: @from, to: @to))
+      end
+
+      def user_has_sufficient_access?
+        @project.team.member?(@current_user, Gitlab::Access::REPORTER)
+      end
+
       def serialize(summary_object)
         AnalyticsSummarySerializer.new.represent(summary_object)
       end

spec/features/cycle_analytics_spec.rb

@@ -112,6 +112,10 @@ describe 'Cycle Analytics', :js do
       wait_for_requests
     end
 
+    it 'does not show the commit stats' do
+      expect(page).to have_no_selector(:xpath, commits_counter_selector)
+    end
+
     it 'needs permissions to see restricted stages' do
       expect(find('.stage-events')).to have_content(issue.title)
 
@@ -127,8 +131,12 @@ describe 'Cycle Analytics', :js do
     find(:xpath, "//p[contains(text(),'New Issue')]/preceding-sibling::h3")
   end
 
+  def commits_counter_selector
+    "//p[contains(text(),'Commits')]/preceding-sibling::h3"
+  end
+
   def commits_counter
-    find(:xpath, "//p[contains(text(),'Commits')]/preceding-sibling::h3")
+    find(:xpath, commits_counter_selector)
   end
 
   def deploys_counter

spec/lib/gitlab/cycle_analytics/stage_summary_spec.rb

@@ -6,6 +6,11 @@ describe Gitlab::CycleAnalytics::StageSummary do
   let(:project) { create(:project, :repository) }
   let(:options) { { from: 1.day.ago, current_user: user } }
   let(:user) { create(:user, :admin) }
+
+  before do
+    project.add_maintainer(user)
+  end
+
   let(:stage_summary) { described_class.new(project, options).data }
 
   describe "#new_issues" do
@@ -86,6 +91,24 @@ describe Gitlab::CycleAnalytics::StageSummary do
         expect(subject).to eq(2)
       end
     end
+
+    context 'when a guest user is signed in' do
+      let(:guest_user) { create(:user) }
+
+      before do
+        project.add_guest(guest_user)
+        options.merge!({ current_user: guest_user })
+      end
+
+      it 'does not include commit stats' do
+        data = described_class.new(project, options).data
+        expect(includes_commits?(data)).to be_falsy
+      end
+
+      def includes_commits?(data)
+        data.any? { |h| h["title"] == 'Commits' }
+      end
+    end
   end
 
   describe "#deploys" do