Display only informaton visible to current user

Display only labels and assignees of issues
visible by the currently logged user
Display only issues visible to user in the burndown chart

4 files changed, 112 insertions, 4 deletions

diff --git a/app/models/concerns/milestoneish.rb b/app/models/concerns/milestoneish.rb
index 39372c4f68b..dff8b3af608 100644
--- a/app/models/concerns/milestoneish.rb
+++ b/app/models/concerns/milestoneish.rb
@@ -53,6 +53,18 @@ module Milestoneish
     end
   end
 
+  def issue_participants_visible_by_user(user)
+    User.joins(:issue_assignees)
+      .where('issue_assignees.issue_id' => issues_visible_to_user(user).select(:id))
+      .distinct
+  end
+
+  def issue_labels_visible_by_user(user)
+    Label.joins(:label_links)
+      .where('label_links.target_id' => issues_visible_to_user(user).select(:id), 'label_links.target_type' => 'Issue')
+      .distinct
+  end
+
   def sorted_issues(user)
     issues_visible_to_user(user).preload_associations.sort_by_attribute('label_priority')
   end
diff --git a/app/views/shared/milestones/_tabs.html.haml b/app/views/shared/milestones/_tabs.html.haml
index 55460acab8f..3b435847172 100644
--- a/app/views/shared/milestones/_tabs.html.haml
+++ b/app/views/shared/milestones/_tabs.html.haml
@@ -21,11 +21,11 @@
     %li.nav-item
       = link_to '#tab-participants', class: 'nav-link', 'data-toggle' => 'tab', 'data-endpoint': milestone_participants_tab_path(milestone) do
         Participants
-        %span.badge.badge-pill= milestone.participants.count
+        %span.badge.badge-pill= milestone.issue_participants_visible_by_user(current_user).count
     %li.nav-item
       = link_to '#tab-labels', class: 'nav-link', 'data-toggle' => 'tab', 'data-endpoint': milestone_labels_tab_path(milestone) do
         Labels
-        %span.badge.badge-pill= milestone.labels.count
+        %span.badge.badge-pill= milestone.issue_labels_visible_by_user(current_user).count
 
 - issues = milestone.sorted_issues(current_user)
 - show_project_name = local_assigns.fetch(:show_project_name, false)
diff --git a/changelogs/unreleased/security-2774-milestones-detail.yml b/changelogs/unreleased/security-2774-milestones-detail.yml
new file mode 100644
index 00000000000..faf56fee01e
--- /dev/null
+++ b/changelogs/unreleased/security-2774-milestones-detail.yml
@@ -0,0 +1,5 @@
+---
+title: Display only information visible to current user on the Milestone page
+merge_request:
+author:
+type: security
diff --git a/spec/models/concerns/milestoneish_spec.rb b/spec/models/concerns/milestoneish_spec.rb
index 4647eecbdef..81ca5b638fe 100644
--- a/spec/models/concerns/milestoneish_spec.rb
+++ b/spec/models/concerns/milestoneish_spec.rb
@@ -9,8 +9,10 @@ describe Milestone, 'Milestoneish' do
   let(:admin) { create(:admin) }
   let(:project) { create(:project, :public) }
   let(:milestone) { create(:milestone, project: project) }
-  let!(:issue) { create(:issue, project: project, milestone: milestone) }
-  let!(:security_issue_1) { create(:issue, :confidential, project: project, author: author, milestone: milestone) }
+  let(:label1) { create(:label, project: project) }
+  let(:label2) { create(:label, project: project) }
+  let!(:issue) { create(:issue, project: project, milestone: milestone, assignees: [member], labels: [label1]) }
+  let!(:security_issue_1) { create(:issue, :confidential, project: project, author: author, milestone: milestone, labels: [label2]) }
   let!(:security_issue_2) { create(:issue, :confidential, project: project, assignees: [assignee], milestone: milestone) }
   let!(:closed_issue_1) { create(:issue, :closed, project: project, milestone: milestone) }
   let!(:closed_issue_2) { create(:issue, :closed, project: project, milestone: milestone) }
@@ -42,6 +44,95 @@ describe Milestone, 'Milestoneish' do
     end
   end
 
+  context 'attributes visibility' do
+    using RSpec::Parameterized::TableSyntax
+
+    let(:users) do
+      {
+        anonymous: nil,
+        non_member: non_member,
+        guest: guest,
+        member: member,
+        assignee: assignee
+      }
+    end
+
+    let(:project_visibility_levels) do
+      {
+        public: Gitlab::VisibilityLevel::PUBLIC,
+        internal: Gitlab::VisibilityLevel::INTERNAL,
+        private: Gitlab::VisibilityLevel::PRIVATE
+      }
+    end
+
+    describe '#issue_participants_visible_by_user' do
+      where(:visibility, :user_role, :result) do
+        :public   | nil         | [:member]
+        :public   | :non_member | [:member]
+        :public   | :guest      | [:member]
+        :public   | :member     | [:member, :assignee]
+        :internal | nil         | []
+        :internal | :non_member | [:member]
+        :internal | :guest      | [:member]
+        :internal | :member     | [:member, :assignee]
+        :private  | nil         | []
+        :private  | :non_member | []
+        :private  | :guest      | [:member]
+        :private  | :member     | [:member, :assignee]
+      end
+
+      with_them do
+        before do
+          project.update(visibility_level: project_visibility_levels[visibility])
+        end
+
+        it 'returns the proper participants' do
+          user = users[user_role]
+          participants = result.map { |role| users[role] }
+
+          expect(milestone.issue_participants_visible_by_user(user)).to match_array(participants)
+        end
+      end
+    end
+
+    describe '#issue_labels_visible_by_user' do
+      let(:labels) do
+        {
+          label1: label1,
+          label2: label2
+        }
+      end
+
+      where(:visibility, :user_role, :result) do
+        :public   | nil         | [:label1]
+        :public   | :non_member | [:label1]
+        :public   | :guest      | [:label1]
+        :public   | :member     | [:label1, :label2]
+        :internal | nil         | []
+        :internal | :non_member | [:label1]
+        :internal | :guest      | [:label1]
+        :internal | :member     | [:label1, :label2]
+        :private  | nil         | []
+        :private  | :non_member | []
+        :private  | :guest      | [:label1]
+        :private  | :member     | [:label1, :label2]
+      end
+
+      with_them do
+        before do
+          project.update(visibility_level: project_visibility_levels[visibility])
+        end
+
+        it 'returns the proper participants' do
+          user = users[user_role]
+          expected_labels = result.map { |label| labels[label] }
+
+          expect(milestone.issue_labels_visible_by_user(user)).to match_array(expected_labels)
+        end
+      end
+    end
+  end
+
   describe '#sorted_merge_requests' do
     it 'sorts merge requests by label priority' do
       merge_request_1 = create(:labeled_merge_request, labels: [label_2], source_project: project, source_branch: 'branch_1', milestone: milestone)