require "rails_helper"

describe Rack::Attack, type: :request, throttle: true do
  before do
    cache_db = ActiveSupport::Cache.lookup_store(:redis_cache_store)
    allow(Rails).to receive(:cache) { cache_db }
    cache_db.redis.flushdb
    allow(Honeycomb).to receive(:add_field)
  end

  describe "search_throttle" do
    it "throttles /search endpoints based on IP" do
      Timecop.freeze do
        allow(Search::Postgres::Username).to receive(:search_documents).and_return({})

        valid_responses = Array.new(5).map do
          get "/search/usernames", headers: { "HTTP_FASTLY_CLIENT_IP" => "5.6.7.8" }
        end
        throttled_response = get "/search/usernames", headers: { "HTTP_FASTLY_CLIENT_IP" => "5.6.7.8" }
        new_ip_response = get "/search/usernames", headers: { "HTTP_FASTLY_CLIENT_IP" => "1.1.1.1" }

        valid_responses.each { |r| expect(r).not_to eq(429) }
        expect(throttled_response).to eq(429)
        expect(new_ip_response).not_to eq(429)
        expect(Honeycomb).to have_received(:add_field).with("fastly_client_ip", "5.6.7.8").exactly(11).times
        expect(Honeycomb).to have_received(:add_field).with("fastly_client_ip", "1.1.1.1").exactly(2).times
      end
    end
  end

  describe "api_throttle" do
    it "throttles api get endpoints based on IP" do
      Timecop.freeze do
        valid_responses = Array.new(3).map do
          get api_articles_path, headers: { "HTTP_FASTLY_CLIENT_IP" => "5.6.7.8" }
        end
        throttled_response = get api_articles_path, headers: { "HTTP_FASTLY_CLIENT_IP" => "5.6.7.8" }
        new_ip_response = get api_articles_path, headers: { "HTTP_FASTLY_CLIENT_IP" => "1.1.1.1" }

        valid_responses.each { |r| expect(r).not_to eq(429) }
        expect(throttled_response).to eq(429)
        expect(new_ip_response).not_to eq(429)
        expect(Honeycomb).to have_received(:add_field).with("fastly_client_ip", "5.6.7.8").exactly(7).times
        expect(Honeycomb).to have_received(:add_field).with("fastly_client_ip", "1.1.1.1").exactly(2).times
      end
    end
  end

  describe "api_write_throttle" do
    let(:api_secret) { create(:api_secret) }
    let(:another_api_secret) { create(:api_secret) }
    let(:headers) do
      { "api-key" => api_secret.secret, "content-type" => "application/json", "HTTP_FASTLY_CLIENT_IP" => "5.6.7.8" }
    end
    let(:dif_headers) do
      {
        "api-key" => another_api_secret.secret,
        "content-type" => "application/json",
        "HTTP_FASTLY_CLIENT_IP" => "5.6.7.8"
      }
    end

    it "throttles api write endpoints based on IP and API key" do
      params = { article: { body_markdown: "", title: Faker::Book.title } }.to_json

      Timecop.freeze do
        valid_response = post api_articles_path, params: params, headers: headers
        throttled_response = post api_articles_path, params: params, headers: headers
        new_api_response = post api_articles_path, params: params, headers: dif_headers

        expect(valid_response).not_to eq(429)
        expect(throttled_response).to eq(429)
        expect(new_api_response).not_to eq(429)
        expect(Honeycomb).to have_received(:add_field).with("fastly_client_ip", "5.6.7.8").exactly(5).times
        expect(Honeycomb).to have_received(:add_field).with("user_api_key", api_secret.secret).exactly(2).times
        expect(Honeycomb).to have_received(:add_field).with("user_api_key", another_api_secret.secret)
      end
    end

    it "throttles api write endpoints based on IP if API key not present" do
      headers = { "content-type" => "application/json", "HTTP_FASTLY_CLIENT_IP" => "5.6.7.8" }
      dif_headers = { "content-type" => "application/json", "HTTP_FASTLY_CLIENT_IP" => "1.1.1.1" }
      params = { article: { body_markdown: "", title: Faker::Book.title } }.to_json

      Timecop.freeze do
        valid_response = post api_articles_path, params: params, headers: headers
        throttled_response = post api_articles_path, params: params, headers: headers
        new_api_response = post api_articles_path, params: params, headers: dif_headers

        expect(valid_response).not_to eq(429)
        expect(throttled_response).to eq(429)
        expect(new_api_response).not_to eq(429)
        expect(Honeycomb).to have_received(:add_field).with("fastly_client_ip", "5.6.7.8").exactly(3).times
        expect(Honeycomb).to have_received(:add_field).with("fastly_client_ip", "1.1.1.1").exactly(2).times
      end
    end
  end

  describe "message_tag_throttle" do
    let(:user) { create(:user) }
    let(:chat_channel) { create(:chat_channel) }
    let(:new_message) do
      {
        message_markdown: "hi",
        user_id: user.id,
        temp_id: "sd78jdssd",
        chat_channel_id: chat_channel.id
      }
    end
    let(:headers) { { "HTTP_FASTLY_CLIENT_IP" => "5.6.7.8" } }
    let(:dif_headers) { { "HTTP_FASTLY_CLIENT_IP" => "1.1.1.1" } }

    before do
      allow(Pusher).to receive(:trigger).and_return(true)
      sign_in user
    end

    it "throttles creating messages" do
      Timecop.freeze do
        valid_responses = Array.new(2).map do
          post messages_path, params: { message: new_message }, headers: headers
        end
        throttled_response = post messages_path, params: { message: new_message }, headers: headers
        new_response = post messages_path, params: { message: new_message }, headers: dif_headers

        valid_responses.each { |r| expect(r).not_to eq(429) }
        expect(throttled_response).to eq(429)
        expect(new_response).not_to eq(429)
        expect(Honeycomb).to have_received(:add_field).with("fastly_client_ip", "5.6.7.8").exactly(6).times
        expect(Honeycomb).to have_received(:add_field).with("fastly_client_ip", "1.1.1.1").exactly(2).times
      end
    end

    # rubocop:disable RSpec/AnyInstance, RSpec/ExampleLength
    it "throttles viewing tags" do
      allow_any_instance_of(StoriesController).to receive(:tagged_count).and_return(0)
      allow_any_instance_of(StoriesController).to receive(:stories_by_timeframe).and_return(Article.none)
      allow_any_instance_of(Articles::Feeds::LargeForemExperimental).to receive(
        :published_articles_by_tag,
      ).and_return(Article.none)
      tag_path = "/t/#{create(:tag).name}"

      get tag_path, headers: headers # warm up the slow endpoint

      Timecop.freeze do
        valid_responses = Array.new(2).map do
          get tag_path, headers: headers
        end
        throttled_response = get tag_path, headers: headers
        new_response = get tag_path, headers: dif_headers

        expect(valid_responses.first).not_to eq(429)
        expect(throttled_response).to eq(429)
        expect(new_response).not_to eq(429)
        expect(Honeycomb).to have_received(:add_field).with("fastly_client_ip", "5.6.7.8").exactly(8).times
        expect(Honeycomb).to have_received(:add_field).with("fastly_client_ip", "1.1.1.1").exactly(2).times
      end
    end
    # rubocop:enable RSpec/AnyInstance, RSpec/ExampleLength
  end
end