# frozen_string_literal: true require 'rails_helper' describe Rack::Attack, type: :request do def app Rails.application end shared_examples 'throttled endpoint' do before do # Rack::Attack periods are not rolling, so avoid flaky tests by setting the time in a way # to avoid crossing period boundaries. # The code Rack::Attack uses to set periods is the following: # https://github.com/rack/rack-attack/blob/v6.7.0/lib/rack/attack/cache.rb#L70-L72 # So we want to minimize `Time.now.to_i % period` travel_to Time.zone.at(counter_prefix * period.seconds) end context 'when the number of requests is lower than the limit' do before do below_limit.times { increment_counter } end it 'does not change the request status' do expect { request.call }.to change { throttle_count }.by(1) expect(response).to_not have_http_status(429) end end context 'when the number of requests is higher than the limit' do before do above_limit.times { increment_counter } end it 'returns http too many requests after limit and returns to normal status after period' do expect { request.call }.to change { throttle_count }.by(1) expect(response).to have_http_status(429) travel period expect { request.call }.to change { throttle_count }.by(1) expect(response).to_not have_http_status(429) end end def below_limit limit - 1 end def above_limit limit * 2 end def throttle_count described_class.cache.read("#{counter_prefix}:#{throttle}:#{remote_ip}") || 0 end def counter_prefix (Time.now.to_i / period.seconds).to_i end def increment_counter described_class.cache.count("#{throttle}:#{remote_ip}", period) end end let(:remote_ip) { '1.2.3.5' } describe 'throttle excessive sign-up requests by IP address' do context 'when accessed through the website' do let(:throttle) { 'throttle_sign_up_attempts/ip' } let(:limit) { 25 } let(:period) { 5.minutes } let(:request) { -> { post path, headers: { 'REMOTE_ADDR' => remote_ip } } } context 'with exact path' do let(:path) { '/auth' } it_behaves_like 'throttled endpoint' end context 'with path with format' do let(:path) { '/auth.html' } it_behaves_like 'throttled endpoint' end end context 'when accessed through the API' do let(:throttle) { 'throttle_api_sign_up' } let(:limit) { 5 } let(:period) { 30.minutes } let(:request) { -> { post path, headers: { 'REMOTE_ADDR' => remote_ip } } } context 'with exact path' do let(:path) { '/api/v1/accounts' } it_behaves_like 'throttled endpoint' end context 'with path with format' do let(:path) { '/api/v1/accounts.json' } it 'returns http not found' do request.call expect(response).to have_http_status(404) end end end end describe 'throttle excessive sign-in requests by IP address' do let(:throttle) { 'throttle_login_attempts/ip' } let(:limit) { 25 } let(:period) { 5.minutes } let(:request) { -> { post path, headers: { 'REMOTE_ADDR' => remote_ip } } } context 'with exact path' do let(:path) { '/auth/sign_in' } it_behaves_like 'throttled endpoint' end context 'with path with format' do let(:path) { '/auth/sign_in.html' } it_behaves_like 'throttled endpoint' end end end