Filter not accessible label events

Label events may use cross-project or cross-group references,
if the projects are not accessible by user, we don't show these
label events.

4 files changed, 208 insertions, 30 deletions

diff --git a/spec/finders/resource_label_event_finder_spec.rb b/spec/finders/resource_label_event_finder_spec.rb
new file mode 100644
index 00000000000..c894387100d
--- /dev/null
+++ b/spec/finders/resource_label_event_finder_spec.rb
@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe ResourceLabelEventFinder do
+  set(:user) { create(:user) }
+  set(:issue_project) { create(:project) }
+  set(:issue) { create(:issue, project: issue_project) }
+
+  describe '#execute' do
+    subject { described_class.new(user, issue).execute }
+
+    it 'returns events with labels accessible by user' do
+      label = create(:label, project: issue_project)
+      event = create_event(label)
+      issue_project.add_guest(user)
+
+      expect(subject).to eq [event]
+    end
+
+    it 'filters events with public project labels if issues and MRs are private' do
+      project = create(:project, :public, :issues_private, :merge_requests_private)
+      label = create(:label, project: project)
+      create_event(label)
+
+      expect(subject).to be_empty
+    end
+
+    it 'filters events with project labels not accessible by user' do
+      project = create(:project, :private)
+      label = create(:label, project: project)
+      create_event(label)
+
+      expect(subject).to be_empty
+    end
+
+    it 'filters events with group labels not accessible by user' do
+      group = create(:group, :private)
+      label = create(:group_label, group: group)
+      create_event(label)
+
+      expect(subject).to be_empty
+    end
+
+    it 'paginates results' do
+      label = create(:label, project: issue_project)
+      create_event(label)
+      create_event(label)
+      issue_project.add_guest(user)
+
+      paginated = described_class.new(user, issue, per_page: 1).execute
+
+      expect(subject.count).to eq 2
+      expect(paginated.count).to eq 1
+    end
+
+    def create_event(label)
+      create(:resource_label_event, issue: issue, label: label)
+    end
+  end
+end
diff --git a/spec/policies/resource_label_event_policy_spec.rb b/spec/policies/resource_label_event_policy_spec.rb
new file mode 100644
index 00000000000..9206640ea00
--- /dev/null
+++ b/spec/policies/resource_label_event_policy_spec.rb
@@ -0,0 +1,67 @@
+require 'spec_helper'
+
+describe ResourceLabelEventPolicy do
+  set(:user) { create(:user) }
+  set(:project) { create(:project, :private) }
+  set(:issue) { create(:issue, project: project) }
+  set(:private_project) { create(:project, :private) }
+
+  describe '#read_resource_label_event' do
+    context 'with non-member user' do
+      it 'does not allow to read event' do
+        event = build_event(project)
+
+        expect(permissions(user, event)).to be_disallowed(:read_resource_label_event)
+      end
+    end
+
+    context 'with member user' do
+      before do
+        project.add_guest(user)
+      end
+
+      it 'allows to read event for accessible label' do
+        event = build_event(project)
+
+        expect(permissions(user, event)).to be_allowed(:read_resource_label_event)
+      end
+
+      it 'does not allow to read event for not accessible label' do
+        event = build_event(private_project)
+
+        expect(permissions(user, event)).to be_disallowed(:read_resource_label_event)
+      end
+    end
+  end
+
+  describe '#read_label' do
+    it 'allows to read deleted label' do
+      event = build(:resource_label_event, issue: issue, label: nil)
+
+      expect(permissions(user, event)).to be_allowed(:read_label)
+    end
+
+    it 'allows to read accessible label' do
+      project.add_guest(user)
+      event = build_event(project)
+
+      expect(permissions(user, event)).to be_allowed(:read_label)
+    end
+
+    it 'does not allow to read not accessible label' do
+      event = build_event(private_project)
+
+      expect(permissions(user, event)).to be_disallowed(:read_label)
+    end
+  end
+
+  def build_event(label_project)
+    label = create(:label, project: label_project)
+
+    build(:resource_label_event, issue: issue, label: label)
+  end
+
+  def permissions(user, issue)
+    described_class.new(user, issue)
+  end
+end
diff --git a/spec/requests/api/resource_label_events_spec.rb b/spec/requests/api/resource_label_events_spec.rb
index 25bea627b0c..8bac378787c 100644
--- a/spec/requests/api/resource_label_events_spec.rb
+++ b/spec/requests/api/resource_label_events_spec.rb
@@ -5,28 +5,23 @@ require 'spec_helper'
 describe API::ResourceLabelEvents do
   set(:user) { create(:user) }
   set(:project) { create(:project, :public, namespace: user.namespace) }
+  set(:label) { create(:label, project: project) }
 
   before do
     project.add_developer(user)
   end
 
   context 'when eventable is an Issue' do
-    let(:issue) { create(:issue, project: project, author: user) }
-
     it_behaves_like 'resource_label_events API', 'projects', 'issues', 'iid' do
       let(:parent) { project }
-      let(:eventable) { issue }
-      let!(:event) { create(:resource_label_event, issue: issue) }
+      let(:eventable) { create(:issue, project: project, author: user) }
     end
   end
 
   context 'when eventable is a Merge Request' do
-    let(:merge_request) { create(:merge_request, source_project: project, target_project: project, author: user) }
-
     it_behaves_like 'resource_label_events API', 'projects', 'merge_requests', 'iid' do
       let(:parent) { project }
-      let(:eventable) { merge_request }
-      let!(:event) { create(:resource_label_event, merge_request: merge_request) }
+      let(:eventable) { create(:merge_request, source_project: project, target_project: project, author: user) }
     end
   end
 end
diff --git a/spec/support/shared_examples/resource_label_events_api.rb b/spec/support/shared_examples/resource_label_events_api.rb
index 945cb8d9f2c..6622df78ee2 100644
--- a/spec/support/shared_examples/resource_label_events_api.rb
+++ b/spec/support/shared_examples/resource_label_events_api.rb
@@ -2,43 +2,98 @@
 
 shared_examples 'resource_label_events API' do |parent_type, eventable_type, id_name|
   describe "GET /#{parent_type}/:id/#{eventable_type}/:noteable_id/resource_label_events" do
-    it "returns an array of resource label events" do
-      get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events", user)
+    context "with local label reference" do
+      let!(:event) { create_event(label) }
 
-      expect(response).to have_gitlab_http_status(200)
-      expect(response).to include_pagination_headers
-      expect(json_response).to be_an Array
-      expect(json_response.first['id']).to eq(event.id)
-    end
+      it "returns an array of resource label events" do
+        get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events", user)
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(response).to include_pagination_headers
+        expect(json_response).to be_an Array
+        expect(json_response.first['id']).to eq(event.id)
+      end
+
+      it "returns a 404 error when eventable id not found" do
+        get api("/#{parent_type}/#{parent.id}/#{eventable_type}/12345/resource_label_events", user)
+
+        expect(response).to have_gitlab_http_status(404)
+      end
+
+      it "returns 404 when not authorized" do
+        parent.update!(visibility_level: Gitlab::VisibilityLevel::PRIVATE)
+        private_user = create(:user)
 
-    it "returns a 404 error when eventable id not found" do
-      get api("/#{parent_type}/#{parent.id}/#{eventable_type}/12345/resource_label_events", user)
+        get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events", private_user)
 
-      expect(response).to have_gitlab_http_status(404)
+        expect(response).to have_gitlab_http_status(404)
+      end
     end
 
-    it "returns 404 when not authorized" do
-      parent.update!(visibility_level: Gitlab::VisibilityLevel::PRIVATE)
-      private_user = create(:user)
+    context "with cross-project label reference" do
+      let(:private_project) { create(:project, :private) }
+      let(:project_label) { create(:label, project: private_project) }
+      let!(:event) { create_event(project_label) }
 
-      get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events", private_user)
+      it "returns cross references accessible by user" do
+        private_project.add_guest(user)
 
-      expect(response).to have_gitlab_http_status(404)
+        get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events", user)
+
+        expect(json_response).to be_an Array
+        expect(json_response.first['id']).to eq(event.id)
+      end
+
+      it "does not return cross references not accessible by user" do
+        get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events", user)
+
+        expect(json_response).to be_an Array
+        expect(json_response).to eq []
+      end
     end
   end
 
   describe "GET /#{parent_type}/:id/#{eventable_type}/:noteable_id/resource_label_events/:event_id" do
-    it "returns a resource label event by id" do
-      get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events/#{event.id}", user)
+    context "with local label reference" do
+      let!(:event) { create_event(label) }
+
+      it "returns a resource label event by id" do
+        get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events/#{event.id}", user)
 
-      expect(response).to have_gitlab_http_status(200)
-      expect(json_response['id']).to eq(event.id)
+        expect(response).to have_gitlab_http_status(200)
+        expect(json_response['id']).to eq(event.id)
+      end
+
+      it "returns 404 when not authorized" do
+        parent.update!(visibility_level: Gitlab::VisibilityLevel::PRIVATE)
+        private_user = create(:user)
+
+        get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events/#{event.id}", private_user)
+
+        expect(response).to have_gitlab_http_status(404)
+      end
+
+      it "returns a 404 error if resource label event not found" do
+        get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events/12345", user)
+
+        expect(response).to have_gitlab_http_status(404)
+      end
     end
 
-    it "returns a 404 error if resource label event not found" do
-      get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events/12345", user)
+    context "with cross-project label reference" do
+      let(:private_project) { create(:project, :private) }
+      let(:project_label) { create(:label, project: private_project) }
+      let!(:event) { create_event(project_label) }
+
+      it "returns a 404 error if cross-reference project is not accessible" do
+        get api("/#{parent_type}/#{parent.id}/#{eventable_type}/#{eventable[id_name]}/resource_label_events/#{event.id}", user)
 
-      expect(response).to have_gitlab_http_status(404)
+        expect(response).to have_gitlab_http_status(404)
+      end
     end
   end
+
+  def create_event(label)
+    create(:resource_label_event, eventable.class.name.underscore => eventable, label: label)
+  end
 end