1 files changed, 96 insertions, 0 deletions
diff --git a/spec/lib/gitlab/rack_attack_spec.rb b/spec/lib/gitlab/rack_attack_spec.rb
new file mode 100644
index 00000000000..d72863b0103
--- /dev/null
+++ b/spec/lib/gitlab/rack_attack_spec.rb
@@ -0,0 +1,96 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::RackAttack, :aggregate_failures do
+  describe '.configure' do
+    let(:fake_rack_attack) { class_double("Rack::Attack") }
+    let(:fake_rack_attack_request) { class_double("Rack::Attack::Request") }
+
+    let(:throttles) do
+      {
+        throttle_unauthenticated: Gitlab::Throttle.unauthenticated_options,
+        throttle_authenticated_api: Gitlab::Throttle.authenticated_api_options,
+        throttle_product_analytics_collector: { limit: 100, period: 60 },
+        throttle_unauthenticated_protected_paths: Gitlab::Throttle.unauthenticated_options,
+        throttle_authenticated_protected_paths_api: Gitlab::Throttle.authenticated_api_options,
+        throttle_authenticated_protected_paths_web: Gitlab::Throttle.authenticated_web_options
+      }
+    end
+
+    before do
+      stub_const("Rack::Attack", fake_rack_attack)
+      stub_const("Rack::Attack::Request", fake_rack_attack_request)
+
+      # Expect rather than just allow, because this is actually fairly important functionality
+      expect(fake_rack_attack).to receive(:throttled_response_retry_after_header=).with(true)
+      allow(fake_rack_attack).to receive(:throttle)
+      allow(fake_rack_attack).to receive(:track)
+      allow(fake_rack_attack).to receive(:safelist)
+      allow(fake_rack_attack).to receive(:blocklist)
+    end
+
+    it 'extends the request class' do
+      described_class.configure(fake_rack_attack)
+
+      expect(fake_rack_attack_request).to include(described_class::Request)
+    end
+
+    it 'configures the safelist' do
+      described_class.configure(fake_rack_attack)
+
+      expect(fake_rack_attack).to have_received(:safelist).with('throttle_bypass_header')
+    end
+
+    it 'configures throttles if no dry-run was configured' do
+      described_class.configure(fake_rack_attack)
+
+      throttles.each do |throttle, options|
+        expect(fake_rack_attack).to have_received(:throttle).with(throttle.to_s, options)
+      end
+    end
+
+    it 'configures tracks if dry-run was configured for all throttles' do
+      stub_env('GITLAB_THROTTLE_DRY_RUN', '*')
+
+      described_class.configure(fake_rack_attack)
+
+      throttles.each do |throttle, options|
+        expect(fake_rack_attack).to have_received(:track).with(throttle.to_s, options)
+      end
+      expect(fake_rack_attack).not_to have_received(:throttle)
+    end
+
+    it 'configures tracks and throttles with a selected set of dry-runs' do
+      dry_run_throttles = throttles.each_key.first(2)
+      regular_throttles = throttles.keys[2..-1]
+      stub_env('GITLAB_THROTTLE_DRY_RUN', dry_run_throttles.join(','))
+
+      described_class.configure(fake_rack_attack)
+
+      dry_run_throttles.each do |throttle|
+        expect(fake_rack_attack).to have_received(:track).with(throttle.to_s, throttles[throttle])
+      end
+      regular_throttles.each do |throttle|
+        expect(fake_rack_attack).to have_received(:throttle).with(throttle.to_s, throttles[throttle])
+      end
+    end
+
+    context 'user allowlist' do
+      subject { described_class.user_allowlist }
+
+      it 'is empty' do
+        described_class.configure(fake_rack_attack)
+
+        expect(subject).to be_empty
+      end
+
+      it 'reflects GITLAB_THROTTLE_USER_ALLOWLIST' do
+        stub_env('GITLAB_THROTTLE_USER_ALLOWLIST', '123,456')
+        described_class.configure(fake_rack_attack)
+
+        expect(subject).to contain_exactly(123, 456)
+      end
+    end
+  end
+end