From ca56527140034952002f8f7334da9f94c4f486a8 Mon Sep 17 00:00:00 2001 From: ThibG Date: Wed, 21 Oct 2020 18:04:09 +0200 Subject: [PATCH] Add follower synchronization mechanism (#14510) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit * Add support for followers synchronization on the receiving end Check the `collectionSynchronization` attribute on `Create` and `Announce` activities and synchronize followers from provided collection if possible. * Add tests for followers synchronization on the receiving end * Add support for follower synchronization on the sender's end * Add tests for the sending end * Switch from AS attributes to HTTP header Replace the custom `collectionSynchronization` ActivityStreams attribute by an HTTP header (`X-AS-Collection-Synchronization`) with the same syntax as the `Signature` header and the following fields: - `collectionId` to specify which collection to synchronize - `digest` for the SHA256 hex-digest of the list of followers known on the receiving instance (where “receiving instance” is determined by accounts sharing the same host name for their ActivityPub actor `id`) - `url` of a collection that should be fetched by the instance actor Internally, move away from the webfinger-based `domain` attribute and use account `uri` prefix to group accounts. * Add environment variable to disable followers synchronization Since the whole mechanism relies on some new preconditions that, in some extremely rare cases, might not be met, add an environment variable (DISABLE_FOLLOWERS_SYNCHRONIZATION) to disable the mechanism altogether and avoid followers being incorrectly removed. The current conditions are: 1. all managed accounts' actor `id` and inbox URL have the same URI scheme and netloc. 2. all accounts whose actor `id` or inbox URL share the same URI scheme and netloc as a managed account must be managed by the same Mastodon instance as well. As far as Mastodon is concerned, breaking those preconditions require extensive configuration changes in the reverse proxy and might also cause other issues. Therefore, this environment variable provides a way out for people with highly unusual configurations, and can be safely ignored for the overwhelming majority of Mastodon administrators. * Only set follower synchronization header on non-public statuses This is to avoid unnecessary computations and allow Follow-related activities to be handled by the usual codepath instead of going through the synchronization mechanism (otherwise, any Follow/Undo/Accept activity would trigger the synchronization mechanism even if processing the activity itself would be enough to re-introduce synchronization) * Change how ActivityPub::SynchronizeFollowersService handles follow requests If the remote lists a local follower which we only know has sent a follow request, consider the follow request as accepted instead of sending an Undo. * Integrate review feeback - rename X-AS-Collection-Synchronization to Collection-Synchronization - various minor refactoring and code style changes * Only select required fields when computing followers_hash * Use actor URI rather than webfinger domain in synchronization endpoint * Change hash computation to be a XOR of individual hashes Makes it much easier to be memory-efficient, and avoid sorting discrepancy issues. * Marginally improve followers_hash computation speed * Further improve hash computation performances by using pluck_each --- Gemfile | 3 + Gemfile.lock | 6 + .../followers_synchronizations_controller.rb | 36 ++++++ .../activitypub/inboxes_controller.rb | 14 +++ app/lib/activitypub/tag_manager.rb | 4 + app/models/account.rb | 6 + app/models/concerns/account_interactions.rb | 20 ++++ app/models/follow.rb | 8 ++ ...epare_followers_synchronization_service.rb | 13 +++ .../synchronize_followers_service.rb | 74 ++++++++++++ app/workers/activitypub/delivery_worker.rb | 10 ++ .../activitypub/distribution_worker.rb | 2 +- .../followers_synchronization_worker.rb | 14 +++ config/routes.rb | 1 + ...lowers_synchronizations_controller_spec.rb | 58 ++++++++++ .../activitypub/inboxes_controller_spec.rb | 50 +++++++++ .../concerns/account_interactions_spec.rb | 43 +++++++ .../synchronize_followers_service_spec.rb | 105 ++++++++++++++++++ .../activitypub/delivery_worker_spec.rb | 10 +- 19 files changed, 474 insertions(+), 3 deletions(-) create mode 100644 app/controllers/activitypub/followers_synchronizations_controller.rb create mode 100644 app/services/activitypub/prepare_followers_synchronization_service.rb create mode 100644 app/services/activitypub/synchronize_followers_service.rb create mode 100644 app/workers/activitypub/followers_synchronization_worker.rb create mode 100644 spec/controllers/activitypub/followers_synchronizations_controller_spec.rb create mode 100644 spec/services/activitypub/synchronize_followers_service_spec.rb diff --git a/Gemfile b/Gemfile index 138566780e..1ad600224b 100644 --- a/Gemfile +++ b/Gemfile @@ -159,3 +159,6 @@ end gem 'concurrent-ruby', require: false gem 'connection_pool', require: false + +gem 'xorcist', '~> 1.1' +gem 'pluck_each', '~> 0.1.3' diff --git a/Gemfile.lock b/Gemfile.lock index aea592da18..915b45512d 100644 --- a/Gemfile.lock +++ b/Gemfile.lock @@ -403,6 +403,9 @@ GEM pghero (2.7.2) activerecord (>= 5) pkg-config (1.4.4) + pluck_each (0.1.3) + activerecord (> 3.2.0) + activesupport (> 3.0.0) posix-spawn (0.3.15) premailer (1.14.2) addressable @@ -662,6 +665,7 @@ GEM websocket-extensions (>= 0.1.0) websocket-extensions (0.1.5) wisper (2.0.1) + xorcist (1.1.2) xpath (3.2.0) nokogiri (~> 1.8) @@ -748,6 +752,7 @@ DEPENDENCIES pg (~> 1.2) pghero (~> 2.7) pkg-config (~> 1.4) + pluck_each (~> 0.1.3) posix-spawn premailer-rails private_address_check (~> 0.5) @@ -796,3 +801,4 @@ DEPENDENCIES webmock (~> 3.9) webpacker (~> 5.2) webpush + xorcist (~> 1.1) diff --git a/app/controllers/activitypub/followers_synchronizations_controller.rb b/app/controllers/activitypub/followers_synchronizations_controller.rb new file mode 100644 index 0000000000..5250311058 --- /dev/null +++ b/app/controllers/activitypub/followers_synchronizations_controller.rb @@ -0,0 +1,36 @@ +# frozen_string_literal: true + +class ActivityPub::FollowersSynchronizationsController < ActivityPub::BaseController + include SignatureVerification + include AccountOwnedConcern + + before_action :require_signature! + before_action :set_items + before_action :set_cache_headers + + def show + expires_in 0, public: false + render json: collection_presenter, + serializer: ActivityPub::CollectionSerializer, + adapter: ActivityPub::Adapter, + content_type: 'application/activity+json' + end + + private + + def uri_prefix + signed_request_account.uri[/http(s?):\/\/[^\/]+\//] + end + + def set_items + @items = @account.followers.where(Account.arel_table[:uri].matches(uri_prefix + '%', false, true)).pluck(:uri) + end + + def collection_presenter + ActivityPub::CollectionPresenter.new( + id: account_followers_synchronization_url(@account), + type: :ordered, + items: @items + ) + end +end diff --git a/app/controllers/activitypub/inboxes_controller.rb b/app/controllers/activitypub/inboxes_controller.rb index 0a561e7f0f..fdb60d5906 100644 --- a/app/controllers/activitypub/inboxes_controller.rb +++ b/app/controllers/activitypub/inboxes_controller.rb @@ -11,6 +11,7 @@ class ActivityPub::InboxesController < ActivityPub::BaseController def create upgrade_account + process_collection_synchronization process_payload head 202 end @@ -52,6 +53,19 @@ class ActivityPub::InboxesController < ActivityPub::BaseController DeliveryFailureTracker.reset!(signed_request_account.inbox_url) end + def process_collection_synchronization + raw_params = request.headers['Collection-Synchronization'] + return if raw_params.blank? || ENV['DISABLE_FOLLOWERS_SYNCHRONIZATION'] == 'true' + + # Re-using the syntax for signature parameters + tree = SignatureParamsParser.new.parse(raw_params) + params = SignatureParamsTransformer.new.apply(tree) + + ActivityPub::PrepareFollowersSynchronizationService.new.call(signed_request_account, params) + rescue Parslet::ParseFailed + Rails.logger.warn 'Error parsing Collection-Synchronization header' + end + def process_payload ActivityPub::ProcessingWorker.perform_async(signed_request_account.id, body, @account&.id) end diff --git a/app/lib/activitypub/tag_manager.rb b/app/lib/activitypub/tag_manager.rb index 3f98dad2eb..3f2ae1106b 100644 --- a/app/lib/activitypub/tag_manager.rb +++ b/app/lib/activitypub/tag_manager.rb @@ -40,6 +40,10 @@ class ActivityPub::TagManager end end + def uri_for_username(username) + account_url(username: username) + end + def generate_uri_for(_target) URI.join(root_url, 'payloads', SecureRandom.uuid) end diff --git a/app/models/account.rb b/app/models/account.rb index 5acc8d621c..59d338f5af 100644 --- a/app/models/account.rb +++ b/app/models/account.rb @@ -352,6 +352,12 @@ class Account < ApplicationRecord shared_inbox_url.presence || inbox_url end + def synchronization_uri_prefix + return 'local' if local? + + @synchronization_uri_prefix ||= uri[/http(s?):\/\/[^\/]+\//] + end + class Field < ActiveModelSerializers::Model attributes :name, :value, :verified_at, :account, :errors diff --git a/app/models/concerns/account_interactions.rb b/app/models/concerns/account_interactions.rb index 6a0ad5aa98..e2c4b8acf5 100644 --- a/app/models/concerns/account_interactions.rb +++ b/app/models/concerns/account_interactions.rb @@ -243,6 +243,26 @@ module AccountInteractions .where('users.current_sign_in_at > ?', User::ACTIVE_DURATION.ago) end + def remote_followers_hash(url_prefix) + Rails.cache.fetch("followers_hash:#{id}:#{url_prefix}") do + digest = "\x00" * 32 + followers.where(Account.arel_table[:uri].matches(url_prefix + '%', false, true)).pluck_each(:uri) do |uri| + Xorcist.xor!(digest, Digest::SHA256.digest(uri)) + end + digest.unpack('H*')[0] + end + end + + def local_followers_hash + Rails.cache.fetch("followers_hash:#{id}:local") do + digest = "\x00" * 32 + followers.where(domain: nil).pluck_each(:username) do |username| + Xorcist.xor!(digest, Digest::SHA256.digest(ActivityPub::TagManager.instance.uri_for_username(username))) + end + digest.unpack('H*')[0] + end + end + private def remove_potential_friendship(other_account, mutual = false) diff --git a/app/models/follow.rb b/app/models/follow.rb index 0b4ddbf3f8..55a9da7928 100644 --- a/app/models/follow.rb +++ b/app/models/follow.rb @@ -41,8 +41,10 @@ class Follow < ApplicationRecord before_validation :set_uri, only: :create after_create :increment_cache_counters + after_create :invalidate_hash_cache after_destroy :remove_endorsements after_destroy :decrement_cache_counters + after_destroy :invalidate_hash_cache private @@ -63,4 +65,10 @@ class Follow < ApplicationRecord account&.decrement_count!(:following_count) target_account&.decrement_count!(:followers_count) end + + def invalidate_hash_cache + return if account.local? && target_account.local? + + Rails.cache.delete("followers_hash:#{target_account_id}:#{account.synchronization_uri_prefix}") + end end diff --git a/app/services/activitypub/prepare_followers_synchronization_service.rb b/app/services/activitypub/prepare_followers_synchronization_service.rb new file mode 100644 index 0000000000..2d22ed701e --- /dev/null +++ b/app/services/activitypub/prepare_followers_synchronization_service.rb @@ -0,0 +1,13 @@ +# frozen_string_literal: true + +class ActivityPub::PrepareFollowersSynchronizationService < BaseService + include JsonLdHelper + + def call(account, params) + @account = account + + return if params['collectionId'] != @account.followers_url || invalid_origin?(params['url']) || @account.local_followers_hash == params['digest'] + + ActivityPub::FollowersSynchronizationWorker.perform_async(@account.id, params['url']) + end +end diff --git a/app/services/activitypub/synchronize_followers_service.rb b/app/services/activitypub/synchronize_followers_service.rb new file mode 100644 index 0000000000..d83fcf55e6 --- /dev/null +++ b/app/services/activitypub/synchronize_followers_service.rb @@ -0,0 +1,74 @@ +# frozen_string_literal: true + +class ActivityPub::SynchronizeFollowersService < BaseService + include JsonLdHelper + include Payloadable + + def call(account, partial_collection_url) + @account = account + + items = collection_items(partial_collection_url) + return if items.nil? + + # There could be unresolved accounts (hence the call to .compact) but this + # should never happen in practice, since in almost all cases we keep an + # Account record, and should we not do that, we should have sent a Delete. + # In any case there is not much we can do if that occurs. + @expected_followers = items.map { |uri| ActivityPub::TagManager.instance.uri_to_resource(uri, Account) }.compact + + remove_unexpected_local_followers! + handle_unexpected_outgoing_follows! + end + + private + + def remove_unexpected_local_followers! + @account.followers.local.where.not(id: @expected_followers.map(&:id)).each do |unexpected_follower| + UnfollowService.new.call(unexpected_follower, @account) + end + end + + def handle_unexpected_outgoing_follows! + @expected_followers.each do |expected_follower| + next if expected_follower.following?(@account) + + if expected_follower.requested?(@account) + # For some reason the follow request went through but we missed it + expected_follower.follow_requests.find_by(target_account: @account)&.authorize! + else + # Since we were not aware of the follow from our side, we do not have an + # ID for it that we can include in the Undo activity. For this reason, + # the Undo may not work with software that relies exclusively on + # matching activity IDs and not the actor and target + follow = Follow.new(account: expected_follower, target_account: @account) + ActivityPub::DeliveryWorker.perform_async(build_undo_follow_json(follow), follow.account_id, follow.target_account.inbox_url) + end + end + end + + def build_undo_follow_json(follow) + Oj.dump(serialize_payload(follow, ActivityPub::UndoFollowSerializer)) + end + + def collection_items(collection_or_uri) + collection = fetch_collection(collection_or_uri) + return unless collection.is_a?(Hash) + + collection = fetch_collection(collection['first']) if collection['first'].present? + return unless collection.is_a?(Hash) + + case collection['type'] + when 'Collection', 'CollectionPage' + collection['items'] + when 'OrderedCollection', 'OrderedCollectionPage' + collection['orderedItems'] + end + end + + def fetch_collection(collection_or_uri) + return collection_or_uri if collection_or_uri.is_a?(Hash) + return if invalid_origin?(collection_or_uri) + + fetch_resource_without_id_validation(collection_or_uri, nil, true) + end +end diff --git a/app/workers/activitypub/delivery_worker.rb b/app/workers/activitypub/delivery_worker.rb index 60775787a8..6c5a576a70 100644 --- a/app/workers/activitypub/delivery_worker.rb +++ b/app/workers/activitypub/delivery_worker.rb @@ -2,6 +2,7 @@ class ActivityPub::DeliveryWorker include Sidekiq::Worker + include RoutingHelper include JsonLdHelper STOPLIGHT_FAILURE_THRESHOLD = 10 @@ -38,9 +39,18 @@ class ActivityPub::DeliveryWorker Request.new(:post, @inbox_url, body: @json, http_client: http_client).tap do |request| request.on_behalf_of(@source_account, :uri, sign_with: @options[:sign_with]) request.add_headers(HEADERS) + request.add_headers({ 'Collection-Synchronization' => synchronization_header }) if ENV['DISABLE_FOLLOWERS_SYNCHRONIZATION'] != 'true' && @options[:synchronize_followers] end end + def synchronization_header + "collectionId=\"#{account_followers_url(@source_account)}\", digest=\"#{@source_account.remote_followers_hash(inbox_url_prefix)}\", url=\"#{account_followers_synchronization_url(@source_account)}\"" + end + + def inbox_url_prefix + @inbox_url[/http(s?):\/\/[^\/]+\//] + end + def perform_request light = Stoplight(@inbox_url) do request_pool.with(@host) do |http_client| diff --git a/app/workers/activitypub/distribution_worker.rb b/app/workers/activitypub/distribution_worker.rb index e4997ba0ea..9b4814644f 100644 --- a/app/workers/activitypub/distribution_worker.rb +++ b/app/workers/activitypub/distribution_worker.rb @@ -13,7 +13,7 @@ class ActivityPub::DistributionWorker return if skip_distribution? ActivityPub::DeliveryWorker.push_bulk(inboxes) do |inbox_url| - [payload, @account.id, inbox_url] + [payload, @account.id, inbox_url, { synchronize_followers: !@status.distributable? }] end relay! if relayable? diff --git a/app/workers/activitypub/followers_synchronization_worker.rb b/app/workers/activitypub/followers_synchronization_worker.rb new file mode 100644 index 0000000000..35a3ef0b96 --- /dev/null +++ b/app/workers/activitypub/followers_synchronization_worker.rb @@ -0,0 +1,14 @@ +# frozen_string_literal: true + +class ActivityPub::FollowersSynchronizationWorker + include Sidekiq::Worker + + sidekiq_options queue: 'push', lock: :until_executed + + def perform(account_id, url) + @account = Account.find_by(id: account_id) + return true if @account.nil? + + ActivityPub::SynchronizeFollowersService.new.call(@account, url) + end +end diff --git a/config/routes.rb b/config/routes.rb index a21dbd45e8..e0ef237233 100644 --- a/config/routes.rb +++ b/config/routes.rb @@ -83,6 +83,7 @@ Rails.application.routes.draw do resource :inbox, only: [:create], module: :activitypub resource :claim, only: [:create], module: :activitypub resources :collections, only: [:show], module: :activitypub + resource :followers_synchronization, only: [:show], module: :activitypub end resource :inbox, only: [:create], module: :activitypub diff --git a/spec/controllers/activitypub/followers_synchronizations_controller_spec.rb b/spec/controllers/activitypub/followers_synchronizations_controller_spec.rb new file mode 100644 index 0000000000..a24d3f8e08 --- /dev/null +++ b/spec/controllers/activitypub/followers_synchronizations_controller_spec.rb @@ -0,0 +1,58 @@ +require 'rails_helper' + +RSpec.describe ActivityPub::FollowersSynchronizationsController, type: :controller do + let!(:account) { Fabricate(:account) } + let!(:follower_1) { Fabricate(:account, domain: 'example.com', uri: 'https://example.com/users/a') } + let!(:follower_2) { Fabricate(:account, domain: 'example.com', uri: 'https://example.com/users/b') } + let!(:follower_3) { Fabricate(:account, domain: 'foo.com', uri: 'https://foo.com/users/a') } + + before do + follower_1.follow!(account) + follower_2.follow!(account) + follower_3.follow!(account) + end + + before do + allow(controller).to receive(:signed_request_account).and_return(remote_account) + end + + describe 'GET #show' do + context 'without signature' do + let(:remote_account) { nil } + + before do + get :show, params: { account_username: account.username } + end + + it 'returns http not authorized' do + expect(response).to have_http_status(401) + end + end + + context 'with signature from example.com' do + let(:remote_account) { Fabricate(:account, domain: 'example.com', uri: 'https://example.com/instance') } + + before do + get :show, params: { account_username: account.username } + end + + it 'returns http success' do + expect(response).to have_http_status(200) + end + + it 'returns application/activity+json' do + expect(response.content_type).to eq 'application/activity+json' + end + + it 'returns orderedItems with followers from example.com' do + json = body_as_json + expect(json[:orderedItems]).to be_an Array + expect(json[:orderedItems].sort).to eq [follower_1.uri, follower_2.uri] + end + + it 'returns private Cache-Control header' do + expect(response.headers['Cache-Control']).to eq 'max-age=0, private' + end + end + end +end diff --git a/spec/controllers/activitypub/inboxes_controller_spec.rb b/spec/controllers/activitypub/inboxes_controller_spec.rb index f3bc23953a..e5c0046119 100644 --- a/spec/controllers/activitypub/inboxes_controller_spec.rb +++ b/spec/controllers/activitypub/inboxes_controller_spec.rb @@ -22,6 +22,56 @@ RSpec.describe ActivityPub::InboxesController, type: :controller do end end + context 'with Collection-Synchronization header' do + let(:remote_account) { Fabricate(:account, followers_url: 'https://example.com/followers', domain: 'example.com', uri: 'https://example.com/actor', protocol: :activitypub) } + let(:synchronization_collection) { remote_account.followers_url } + let(:synchronization_url) { 'https://example.com/followers-for-domain' } + let(:synchronization_hash) { 'somehash' } + let(:synchronization_header) { "collectionId=\"#{synchronization_collection}\", digest=\"#{synchronization_hash}\", url=\"#{synchronization_url}\"" } + + before do + allow(ActivityPub::FollowersSynchronizationWorker).to receive(:perform_async).and_return(nil) + allow_any_instance_of(Account).to receive(:local_followers_hash).and_return('somehash') + + request.headers['Collection-Synchronization'] = synchronization_header + post :create, body: '{}' + end + + context 'with mismatching target collection' do + let(:synchronization_collection) { 'https://example.com/followers2' } + + it 'does not start a synchronization job' do + expect(ActivityPub::FollowersSynchronizationWorker).not_to have_received(:perform_async) + end + end + + context 'with mismatching domain in partial collection attribute' do + let(:synchronization_url) { 'https://example.org/followers' } + + it 'does not start a synchronization job' do + expect(ActivityPub::FollowersSynchronizationWorker).not_to have_received(:perform_async) + end + end + + context 'with matching digest' do + it 'does not start a synchronization job' do + expect(ActivityPub::FollowersSynchronizationWorker).not_to have_received(:perform_async) + end + end + + context 'with mismatching digest' do + let(:synchronization_hash) { 'wronghash' } + + it 'starts a synchronization job' do + expect(ActivityPub::FollowersSynchronizationWorker).to have_received(:perform_async) + end + end + + it 'returns http accepted' do + expect(response).to have_http_status(202) + end + end + context 'without signature' do before do post :create, body: '{}' diff --git a/spec/models/concerns/account_interactions_spec.rb b/spec/models/concerns/account_interactions_spec.rb index f0380179c1..85fbf7e79c 100644 --- a/spec/models/concerns/account_interactions_spec.rb +++ b/spec/models/concerns/account_interactions_spec.rb @@ -539,6 +539,49 @@ describe AccountInteractions do end end + describe '#followers_hash' do + let(:me) { Fabricate(:account, username: 'Me') } + let(:remote_1) { Fabricate(:account, username: 'alice', domain: 'example.org', uri: 'https://example.org/users/alice') } + let(:remote_2) { Fabricate(:account, username: 'bob', domain: 'example.org', uri: 'https://example.org/users/bob') } + let(:remote_3) { Fabricate(:account, username: 'eve', domain: 'foo.org', uri: 'https://foo.org/users/eve') } + + before do + remote_1.follow!(me) + remote_2.follow!(me) + remote_3.follow!(me) + me.follow!(remote_1) + end + + context 'on a local user' do + it 'returns correct hash for remote domains' do + expect(me.remote_followers_hash('https://example.org/')).to eq '707962e297b7bd94468a21bc8e506a1bcea607a9142cd64e27c9b106b2a5f6ec' + expect(me.remote_followers_hash('https://foo.org/')).to eq 'ccb9c18a67134cfff9d62c7f7e7eb88e6b803446c244b84265565f4eba29df0e' + end + + it 'invalidates cache as needed when removing or adding followers' do + expect(me.remote_followers_hash('https://example.org/')).to eq '707962e297b7bd94468a21bc8e506a1bcea607a9142cd64e27c9b106b2a5f6ec' + remote_1.unfollow!(me) + expect(me.remote_followers_hash('https://example.org/')).to eq '241b00794ce9b46aa864f3220afadef128318da2659782985bac5ed5bd436bff' + remote_1.follow!(me) + expect(me.remote_followers_hash('https://example.org/')).to eq '707962e297b7bd94468a21bc8e506a1bcea607a9142cd64e27c9b106b2a5f6ec' + end + end + + context 'on a remote user' do + it 'returns correct hash for remote domains' do + expect(remote_1.local_followers_hash).to eq Digest::SHA256.hexdigest(ActivityPub::TagManager.instance.uri_for(me)) + end + + it 'invalidates cache as needed when removing or adding followers' do + expect(remote_1.local_followers_hash).to eq Digest::SHA256.hexdigest(ActivityPub::TagManager.instance.uri_for(me)) + me.unfollow!(remote_1) + expect(remote_1.local_followers_hash).to eq '0000000000000000000000000000000000000000000000000000000000000000' + me.follow!(remote_1) + expect(remote_1.local_followers_hash).to eq Digest::SHA256.hexdigest(ActivityPub::TagManager.instance.uri_for(me)) + end + end + end + describe 'muting an account' do let(:me) { Fabricate(:account, username: 'Me') } let(:you) { Fabricate(:account, username: 'You') } diff --git a/spec/services/activitypub/synchronize_followers_service_spec.rb b/spec/services/activitypub/synchronize_followers_service_spec.rb new file mode 100644 index 0000000000..75dcf204b7 --- /dev/null +++ b/spec/services/activitypub/synchronize_followers_service_spec.rb @@ -0,0 +1,105 @@ +require 'rails_helper' + +RSpec.describe ActivityPub::SynchronizeFollowersService, type: :service do + let(:actor) { Fabricate(:account, domain: 'example.com', uri: 'http://example.com/account', inbox_url: 'http://example.com/inbox') } + let(:alice) { Fabricate(:account, username: 'alice') } + let(:bob) { Fabricate(:account, username: 'bob') } + let(:eve) { Fabricate(:account, username: 'eve') } + let(:mallory) { Fabricate(:account, username: 'mallory') } + let(:collection_uri) { 'http://example.com/partial-followers' } + + let(:items) do + [ + ActivityPub::TagManager.instance.uri_for(alice), + ActivityPub::TagManager.instance.uri_for(eve), + ActivityPub::TagManager.instance.uri_for(mallory), + ] + end + + let(:payload) do + { + '@context': 'https://www.w3.org/ns/activitystreams', + type: 'Collection', + id: collection_uri, + items: items, + }.with_indifferent_access + end + + subject { described_class.new } + + shared_examples 'synchronizes followers' do + before do + alice.follow!(actor) + bob.follow!(actor) + mallory.request_follow!(actor) + + allow(ActivityPub::DeliveryWorker).to receive(:perform_async) + + subject.call(actor, collection_uri) + end + + it 'keeps expected followers' do + expect(alice.following?(actor)).to be true + end + + it 'removes local followers not in the remote list' do + expect(bob.following?(actor)).to be false + end + + it 'converts follow requests to follow relationships when they have been accepted' do + expect(mallory.following?(actor)).to be true + end + + it 'sends an Undo Follow to the actor' do + expect(ActivityPub::DeliveryWorker).to have_received(:perform_async).with(anything, eve.id, actor.inbox_url) + end + end + + describe '#call' do + context 'when the endpoint is a Collection of actor URIs' do + before do + stub_request(:get, collection_uri).to_return(status: 200, body: Oj.dump(payload)) + end + + it_behaves_like 'synchronizes followers' + end + + context 'when the endpoint is an OrderedCollection of actor URIs' do + let(:payload) do + { + '@context': 'https://www.w3.org/ns/activitystreams', + type: 'OrderedCollection', + id: collection_uri, + orderedItems: items, + }.with_indifferent_access + end + + before do + stub_request(:get, collection_uri).to_return(status: 200, body: Oj.dump(payload)) + end + + it_behaves_like 'synchronizes followers' + end + + context 'when the endpoint is a paginated Collection of actor URIs' do + let(:payload) do + { + '@context': 'https://www.w3.org/ns/activitystreams', + type: 'Collection', + id: collection_uri, + first: { + type: 'CollectionPage', + partOf: collection_uri, + items: items, + } + }.with_indifferent_access + end + + before do + stub_request(:get, collection_uri).to_return(status: 200, body: Oj.dump(payload)) + end + + it_behaves_like 'synchronizes followers' + end + end +end diff --git a/spec/workers/activitypub/delivery_worker_spec.rb b/spec/workers/activitypub/delivery_worker_spec.rb index 351be185cd..f4633731e5 100644 --- a/spec/workers/activitypub/delivery_worker_spec.rb +++ b/spec/workers/activitypub/delivery_worker_spec.rb @@ -3,16 +3,22 @@ require 'rails_helper' describe ActivityPub::DeliveryWorker do + include RoutingHelper + subject { described_class.new } let(:sender) { Fabricate(:account) } let(:payload) { 'test' } + before do + allow_any_instance_of(Account).to receive(:remote_followers_hash).with('https://example.com/').and_return('somehash') + end + describe 'perform' do it 'performs a request' do stub_request(:post, 'https://example.com/api').to_return(status: 200) - subject.perform(payload, sender.id, 'https://example.com/api') - expect(a_request(:post, 'https://example.com/api')).to have_been_made.once + subject.perform(payload, sender.id, 'https://example.com/api', { synchronize_followers: true }) + expect(a_request(:post, 'https://example.com/api').with(headers: { 'Collection-Synchronization' => "collectionId=\"#{account_followers_url(sender)}\", digest=\"somehash\", url=\"#{account_followers_synchronization_url(sender)}\"" })).to have_been_made.once end it 'raises when request fails' do