Fix scope to handle private guest permission

Guest are blocked to certain feature when project is private,
therefore the scope would filter additionally with REPORTER level.

app/models/project.rb

@@ -498,7 +498,13 @@ class Project < ApplicationRecord
   # This scope returns projects where user has access to both the project and the feature.
   def self.filter_by_feature_visibility(feature, user)
-    with_feature_available_for_user(feature, user).public_or_visible_to_user(user)
+    scope = with_feature_available_for_user(feature, user)
+
+    if ProjectFeature.guest_allowed_on_private_project?(feature)
+      scope.public_or_visible_to_user(user)
+    else
+      scope.public_or_visible_to_user(user, Gitlab::Access::REPORTER)
+    end
   end
   scope :active, -> { joins(:issues, :notes, :merge_requests).order('issues.created_at, notes.created_at, merge_requests.created_at DESC') }

app/models/project_feature.rb

@@ -24,6 +24,7 @@ class ProjectFeature < ApplicationRecord
   FEATURES = %i(issues merge_requests wiki snippets builds repository pages).freeze
   PRIVATE_FEATURES_MIN_ACCESS_LEVEL = { merge_requests: Gitlab::Access::REPORTER }.freeze
+  FEATURES_ALLOWED_BY_GUEST_ON_PRIVATE_PROJECT = %i(issues wiki).freeze
   STRING_OPTIONS = HashWithIndifferentAccess.new({
     'disabled' => DISABLED,
     'private'  => PRIVATE,
@@ -45,6 +46,12 @@ class ProjectFeature < ApplicationRecord
       "#{table}.#{attribute}"
     end
+    def guest_allowed_on_private_project?(feature)
+      feature = ensure_feature!(feature)
+
+      FEATURES_ALLOWED_BY_GUEST_ON_PRIVATE_PROJECT.include?(feature)
+    end
+
     def required_minimum_access_level(feature)
       feature = ensure_feature!(feature)

spec/models/project_spec.rb

@@ -3339,6 +3339,20 @@ describe Project do
         expect(projects).to eq([public_project])
       end
     end
+
+    context 'min_access_level' do
+      let!(:private_project) { create(:project, :private) }
+
+      before do
+        private_project.add_guest(user)
+      end
+
+      it 'excludes projects when user does not have required minimum access level' do
+        projects = described_class.all.public_or_visible_to_user(user, Gitlab::Access::REPORTER)
+
+        expect(projects).to contain_exactly(public_project)
+      end
+    end
   end
   describe '.ids_with_issuables_available_for' do
@@ -3490,6 +3504,66 @@ describe Project do
         end
       end
     end
+
+    context 'issues' do
+      let(:feature) { Issue }
+
+      where(:project_level, :feature_access_level, :membership, :expected_count) do
+        permission_table_for_guest_feature_access
+      end
+
+      with_them do
+        it "respects visibility" do
+          update_feature_access_level(project, feature_access_level)
+
+          expected_objects = expected_count == 1 ? [project] : []
+
+          expect(
+            described_class.filter_by_feature_visibility(feature, user)
+          ).to eq(expected_objects)
+        end
+      end
+    end
+
+    context 'wiki' do
+      let(:feature) { :wiki }
+
+      where(:project_level, :feature_access_level, :membership, :expected_count) do
+        permission_table_for_guest_feature_access
+      end
+
+      with_them do
+        it "respects visibility" do
+          update_feature_access_level(project, feature_access_level)
+
+          expected_objects = expected_count == 1 ? [project] : []
+
+          expect(
+            described_class.filter_by_feature_visibility(feature, user)
+          ).to eq(expected_objects)
+        end
+      end
+    end
+
+    context 'code' do
+      let(:feature) { :repository }
+
+      where(:project_level, :feature_access_level, :membership, :expected_count) do
+        permission_table_for_guest_feature_access_and_non_private_project_only
+      end
+
+      with_them do
+        it "respects visibility" do
+          update_feature_access_level(project, feature_access_level)
+
+          expected_objects = expected_count == 1 ? [project] : []
+
+          expect(
+            described_class.filter_by_feature_visibility(feature, user)
+          ).to eq(expected_objects)
+        end
+      end
+    end
   end
   describe '#pages_available?' do