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-rw-r--r--spec/controllers/activitypub/followers_synchronizations_controller_spec.rb58
-rw-r--r--spec/controllers/activitypub/inboxes_controller_spec.rb50
-rw-r--r--spec/models/concerns/account_interactions_spec.rb43
-rw-r--r--spec/services/activitypub/synchronize_followers_service_spec.rb105
-rw-r--r--spec/workers/activitypub/delivery_worker_spec.rb10
5 files changed, 264 insertions, 2 deletions
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 000000000..a24d3f8e0
--- /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 f3bc23953..e5c004611 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 f0380179c..85fbf7e79 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 000000000..75dcf204b
--- /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 351be185c..f4633731e 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