Gab Social. All are welcome.

spec/lib/activitypub/activity/accept_spec.rb

@@ -0,0 +1,64 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Accept do
+  let(:sender)    { Fabricate(:account) }
+  let(:recipient) { Fabricate(:account) }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Accept',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: {
+        id: 'bar',
+        type: 'Follow',
+        actor: ActivityPub::TagManager.instance.uri_for(recipient),
+        object: ActivityPub::TagManager.instance.uri_for(sender),
+      },
+    }.with_indifferent_access
+  end
+
+  describe '#perform' do
+    subject { described_class.new(json, sender) }
+
+    before do
+      Fabricate(:follow_request, account: recipient, target_account: sender)
+      subject.perform
+    end
+
+    it 'creates a follow relationship' do
+      expect(recipient.following?(sender)).to be true
+    end
+
+    it 'removes the follow request' do
+      expect(recipient.requested?(sender)).to be false
+    end
+  end
+
+  context 'given a relay' do
+    let!(:relay) { Fabricate(:relay, state: :pending, follow_activity_id: 'https://abc-123/456') }
+
+    let(:json) do
+      {
+        '@context': 'https://www.w3.org/ns/activitystreams',
+        id: 'foo',
+        type: 'Accept',
+        actor: ActivityPub::TagManager.instance.uri_for(sender),
+        object: {
+          id: 'https://abc-123/456',
+          type: 'Follow',
+          actor: ActivityPub::TagManager.instance.uri_for(recipient),
+          object: ActivityPub::TagManager.instance.uri_for(sender),
+        },
+      }.with_indifferent_access
+    end
+
+    subject { described_class.new(json, sender) }
+
+    it 'marks the relay as accepted' do
+      subject.perform
+      expect(relay.reload.accepted?).to be true
+    end
+  end
+end

spec/lib/activitypub/activity/add_spec.rb

@@ -0,0 +1,48 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Add do
+  let(:sender) { Fabricate(:account, featured_collection_url: 'https://example.com/featured') }
+  let(:status) { Fabricate(:status, account: sender) }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Add',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: ActivityPub::TagManager.instance.uri_for(status),
+      target: sender.featured_collection_url,
+    }.with_indifferent_access
+  end
+
+  describe '#perform' do
+    subject { described_class.new(json, sender) }
+
+    it 'creates a pin' do
+      subject.perform
+      expect(sender.pinned?(status)).to be true
+    end
+
+    context 'when status was not known before' do
+      let(:json) do
+        {
+          '@context': 'https://www.w3.org/ns/activitystreams',
+          id: 'foo',
+          type: 'Add',
+          actor: ActivityPub::TagManager.instance.uri_for(sender),
+          object: 'https://example.com/unknown',
+          target: sender.featured_collection_url,
+        }.with_indifferent_access
+      end
+
+      before do
+        stub_request(:get, 'https://example.com/unknown').to_return(status: 410)
+      end
+
+      it 'fetches the status' do
+        subject.perform
+        expect(a_request(:get, 'https://example.com/unknown')).to have_been_made.at_least_once
+      end
+    end
+  end
+end

spec/lib/activitypub/activity/announce_spec.rb

@@ -0,0 +1,172 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Announce do
+  let(:sender)    { Fabricate(:account, followers_url: 'http://example.com/followers', uri: 'https://example.com/actor') }
+  let(:recipient) { Fabricate(:account) }
+  let(:status)    { Fabricate(:status, account: recipient) }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Announce',
+      actor: 'https://example.com/actor',
+      object: object_json,
+      to: 'http://example.com/followers',
+    }.with_indifferent_access
+  end
+
+  let(:unknown_object_json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'https://example.com/actor/hello-world',
+      type: 'Note',
+      attributedTo: 'https://example.com/actor',
+      content: 'Hello world',
+      to: 'http://example.com/followers',
+    }
+  end
+
+  subject { described_class.new(json, sender) }
+
+  describe '#perform' do
+    context 'when sender is followed by a local account' do
+      before do
+        Fabricate(:account).follow!(sender)
+        stub_request(:get, 'https://example.com/actor/hello-world').to_return(body: Oj.dump(unknown_object_json))
+        subject.perform
+      end
+
+      context 'a known status' do
+        let(:object_json) do
+          ActivityPub::TagManager.instance.uri_for(status)
+        end
+
+        it 'creates a reblog by sender of status' do
+          expect(sender.reblogged?(status)).to be true
+        end
+      end
+
+      context 'an unknown status' do
+        let(:object_json) { 'https://example.com/actor/hello-world' }
+
+        it 'creates a reblog by sender of status' do
+          reblog = sender.statuses.first
+
+          expect(reblog).to_not be_nil
+          expect(reblog.reblog.text).to eq 'Hello world'
+        end
+      end
+
+      context 'self-repost of a previously unknown status with missing attributedTo' do
+        let(:object_json) do
+          {
+            id: 'https://example.com/actor#bar',
+            type: 'Note',
+            content: 'Lorem ipsum',
+            to: 'http://example.com/followers',
+          }
+        end
+
+        it 'creates a reblog by sender of status' do
+          expect(sender.reblogged?(sender.statuses.first)).to be true
+        end
+      end
+
+      context 'self-repost of a previously unknown status with correct attributedTo' do
+        let(:object_json) do
+          {
+            id: 'https://example.com/actor#bar',
+            type: 'Note',
+            content: 'Lorem ipsum',
+            attributedTo: 'https://example.com/actor',
+            to: 'http://example.com/followers',
+          }
+        end
+
+        it 'creates a reblog by sender of status' do
+          expect(sender.reblogged?(sender.statuses.first)).to be true
+        end
+      end
+    end
+
+    context 'when the status belongs to a local user' do
+      before do
+        subject.perform
+      end
+
+      let(:object_json) do
+        ActivityPub::TagManager.instance.uri_for(status)
+      end
+
+      it 'creates a reblog by sender of status' do
+        expect(sender.reblogged?(status)).to be true
+      end
+    end
+
+    context 'when the sender is relayed' do
+      let!(:relay_account) { Fabricate(:account, inbox_url: 'https://relay.example.com/inbox') }
+      let!(:relay) { Fabricate(:relay, inbox_url: 'https://relay.example.com/inbox') }
+
+      subject { described_class.new(json, sender, relayed_through_account: relay_account) }
+
+      context 'and the relay is enabled' do
+        before do
+          relay.update(state: :accepted)
+          subject.perform
+        end
+
+        let(:object_json) do
+          {
+            id: 'https://example.com/actor#bar',
+            type: 'Note',
+            content: 'Lorem ipsum',
+            to: 'http://example.com/followers',
+          }
+        end
+
+        it 'creates a reblog by sender of status' do
+          expect(sender.statuses.count).to eq 2
+        end
+      end
+
+      context 'and the relay is disabled' do
+        before do
+          subject.perform
+        end
+
+        let(:object_json) do
+          {
+            id: 'https://example.com/actor#bar',
+            type: 'Note',
+            content: 'Lorem ipsum',
+            to: 'http://example.com/followers',
+          }
+        end
+
+        it 'does not create anything' do
+          expect(sender.statuses.count).to eq 0
+        end
+      end
+    end
+
+    context 'when the sender has no relevance to local activity' do
+      before do
+        subject.perform
+      end
+
+      let(:object_json) do
+        {
+          id: 'https://example.com/actor#bar',
+          type: 'Note',
+          content: 'Lorem ipsum',
+          to: 'http://example.com/followers',
+        }
+      end
+
+      it 'does not create anything' do
+        expect(sender.statuses.count).to eq 0
+      end
+    end
+  end
+end

spec/lib/activitypub/activity/block_spec.rb

@@ -0,0 +1,85 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Block do
+  let(:sender)    { Fabricate(:account) }
+  let(:recipient) { Fabricate(:account) }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Block',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: ActivityPub::TagManager.instance.uri_for(recipient),
+    }.with_indifferent_access
+  end
+
+  context 'when the recipient does not follow the sender' do
+    describe '#perform' do
+      subject { described_class.new(json, sender) }
+
+      before do
+        subject.perform
+      end
+
+      it 'creates a block from sender to recipient' do
+        expect(sender.blocking?(recipient)).to be true
+      end
+    end
+  end
+
+  context 'when the recipient follows the sender' do
+    before do
+      recipient.follow!(sender)
+    end
+
+    describe '#perform' do
+      subject { described_class.new(json, sender) }
+
+      before do
+        subject.perform
+      end
+
+      it 'creates a block from sender to recipient' do
+        expect(sender.blocking?(recipient)).to be true
+      end
+
+      it 'ensures recipient is not following sender' do
+        expect(recipient.following?(sender)).to be false
+      end
+    end
+  end
+
+  context 'when a matching undo has been received first' do
+    let(:undo_json) do
+      {
+        '@context': 'https://www.w3.org/ns/activitystreams',
+        id: 'bar',
+        type: 'Undo',
+        actor: ActivityPub::TagManager.instance.uri_for(sender),
+        object: json,
+      }.with_indifferent_access
+    end
+
+    before do
+      recipient.follow!(sender)
+      ActivityPub::Activity::Undo.new(undo_json, sender).perform
+    end
+
+    describe '#perform' do
+      subject { described_class.new(json, sender) }
+
+      before do
+        subject.perform
+      end
+
+      it 'does not create a block from sender to recipient' do
+        expect(sender.blocking?(recipient)).to be false
+      end
+
+      it 'ensures recipient is not following sender' do
+        expect(recipient.following?(sender)).to be false
+      end
+    end
+  end
+end

spec/lib/activitypub/activity/create_spec.rb

@@ -0,0 +1,631 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Create do
+  let(:sender) { Fabricate(:account, followers_url: 'http://example.com/followers', domain: 'example.com', uri: 'https://example.com/actor') }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: [ActivityPub::TagManager.instance.uri_for(sender), '#foo'].join,
+      type: 'Create',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: object_json,
+    }.with_indifferent_access
+  end
+
+  before do
+    sender.update(uri: ActivityPub::TagManager.instance.uri_for(sender))
+
+    stub_request(:get, 'http://example.com/attachment.png').to_return(request_fixture('avatar.txt'))
+    stub_request(:get, 'http://example.com/emoji.png').to_return(body: attachment_fixture('emojo.png'))
+  end
+
+  describe '#perform' do
+    context 'when fetching' do
+      subject { described_class.new(json, sender) }
+
+      before do
+        subject.perform
+      end
+
+      context 'unknown object type' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Banana',
+            content: 'Lorem ipsum',
+          }
+        end
+
+        it 'does not create a status' do
+          expect(sender.statuses.count).to be_zero
+        end
+      end
+
+      context 'standalone' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.text).to eq 'Lorem ipsum'
+        end
+
+        it 'missing to/cc defaults to direct privacy' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.visibility).to eq 'direct'
+        end
+      end
+
+      context 'public' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            to: 'https://www.w3.org/ns/activitystreams#Public',
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.visibility).to eq 'public'
+        end
+      end
+
+      context 'unlisted' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            cc: 'https://www.w3.org/ns/activitystreams#Public',
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.visibility).to eq 'unlisted'
+        end
+      end
+
+      context 'private' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            to: 'http://example.com/followers',
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.visibility).to eq 'private'
+        end
+      end
+
+      context 'limited' do
+        let(:recipient) { Fabricate(:account) }
+
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            to: ActivityPub::TagManager.instance.uri_for(recipient),
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.visibility).to eq 'limited'
+        end
+
+        it 'creates silent mention' do
+          status = sender.statuses.first
+          expect(status.mentions.first).to be_silent
+        end
+      end
+
+      context 'direct' do
+        let(:recipient) { Fabricate(:account) }
+
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            to: ActivityPub::TagManager.instance.uri_for(recipient),
+            tag: {
+              type: 'Mention',
+              href: ActivityPub::TagManager.instance.uri_for(recipient),
+            },
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.visibility).to eq 'direct'
+        end
+      end
+
+      context 'as a reply' do
+        let(:original_status) { Fabricate(:status) }
+
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            inReplyTo: ActivityPub::TagManager.instance.uri_for(original_status),
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.thread).to eq original_status
+          expect(status.reply?).to be true
+          expect(status.in_reply_to_account).to eq original_status.account
+          expect(status.conversation).to eq original_status.conversation
+        end
+      end
+
+      context 'with mentions' do
+        let(:recipient) { Fabricate(:account) }
+
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            tag: [
+              {
+                type: 'Mention',
+                href: ActivityPub::TagManager.instance.uri_for(recipient),
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.mentions.map(&:account)).to include(recipient)
+        end
+      end
+
+      context 'with mentions missing href' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            tag: [
+              {
+                type: 'Mention',
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+          expect(status).to_not be_nil
+        end
+      end
+
+      context 'with media attachments' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            attachment: [
+              {
+                type: 'Document',
+                mediaType: 'image/png',
+                url: 'http://example.com/attachment.png',
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.media_attachments.map(&:remote_url)).to include('http://example.com/attachment.png')
+        end
+      end
+
+      context 'with media attachments with focal points' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            attachment: [
+              {
+                type: 'Document',
+                mediaType: 'image/png',
+                url: 'http://example.com/attachment.png',
+                focalPoint: [0.5, -0.7],
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.media_attachments.map(&:focus)).to include('0.5,-0.7')
+        end
+      end
+
+      context 'with media attachments missing url' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            attachment: [
+              {
+                type: 'Document',
+                mediaType: 'image/png',
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+          expect(status).to_not be_nil
+        end
+      end
+
+      context 'with hashtags' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            tag: [
+              {
+                type: 'Hashtag',
+                href: 'http://example.com/blah',
+                name: '#test',
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.tags.map(&:name)).to include('test')
+        end
+      end
+
+      context 'with hashtags missing name' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            tag: [
+              {
+                type: 'Hashtag',
+                href: 'http://example.com/blah',
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+          expect(status).to_not be_nil
+        end
+      end
+
+      context 'with emojis' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum :tinking:',
+            tag: [
+              {
+                type: 'Emoji',
+                icon: {
+                  url: 'http://example.com/emoji.png',
+                },
+                name: 'tinking',
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.emojis.map(&:shortcode)).to include('tinking')
+        end
+      end
+
+      context 'with emojis missing name' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum :tinking:',
+            tag: [
+              {
+                type: 'Emoji',
+                icon: {
+                  url: 'http://example.com/emoji.png',
+                },
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+          expect(status).to_not be_nil
+        end
+      end
+
+      context 'with emojis missing icon' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum :tinking:',
+            tag: [
+              {
+                type: 'Emoji',
+                name: 'tinking',
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+          expect(status).to_not be_nil
+        end
+      end
+
+      context 'with poll' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Question',
+            content: 'Which color was the submarine?',
+            oneOf: [
+              {
+                name: 'Yellow',
+                replies: {
+                  type: 'Collection',
+                  totalItems: 10,
+                },
+              },
+              {
+                name: 'Blue',
+                replies: {
+                  type: 'Collection',
+                  totalItems: 3,
+                }
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+          expect(status).to_not be_nil
+          expect(status.poll).to_not be_nil
+        end
+
+        it 'creates a poll' do
+          poll = sender.polls.first
+          expect(poll).to_not be_nil
+          expect(poll.status).to_not be_nil
+          expect(poll.options).to eq %w(Yellow Blue)
+          expect(poll.cached_tallies).to eq [10, 3]
+        end
+      end
+
+      context 'when a vote to a local poll' do
+        let(:poll) { Fabricate(:poll, options: %w(Yellow Blue)) }
+        let!(:local_status) { Fabricate(:status, poll: poll) }
+
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            name: 'Yellow',
+            inReplyTo: ActivityPub::TagManager.instance.uri_for(local_status)
+          }
+        end
+
+        it 'adds a vote to the poll with correct uri' do
+          vote = poll.votes.first
+          expect(vote).to_not be_nil
+          expect(vote.uri).to eq object_json[:id]
+          expect(poll.reload.cached_tallies).to eq [1, 0]
+        end
+      end
+
+      context 'when a vote to an expired local poll' do
+        let(:poll) do
+          poll = Fabricate.build(:poll, options: %w(Yellow Blue), expires_at: 1.day.ago)
+          poll.save(validate: false)
+          poll
+        end
+        let!(:local_status) { Fabricate(:status, poll: poll) }
+
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            name: 'Yellow',
+            inReplyTo: ActivityPub::TagManager.instance.uri_for(local_status)
+          }
+        end
+
+        it 'does not add a vote to the poll' do
+          expect(poll.votes.first).to be_nil
+        end
+      end
+    end
+
+    context 'when sender is followed by local users' do
+      subject { described_class.new(json, sender, delivery: true) }
+
+      before do
+        Fabricate(:account).follow!(sender)
+        subject.perform
+      end
+
+      let(:object_json) do
+        {
+          id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+          type: 'Note',
+          content: 'Lorem ipsum',
+        }
+      end
+
+      it 'creates status' do
+        status = sender.statuses.first
+
+        expect(status).to_not be_nil
+        expect(status.text).to eq 'Lorem ipsum'
+      end
+    end
+
+    context 'when sender replies to local status' do
+      let!(:local_status) { Fabricate(:status) }
+
+      subject { described_class.new(json, sender, delivery: true) }
+
+      before do
+        subject.perform
+      end
+
+      let(:object_json) do
+        {
+          id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+          type: 'Note',
+          content: 'Lorem ipsum',
+          inReplyTo: ActivityPub::TagManager.instance.uri_for(local_status),
+        }
+      end
+
+      it 'creates status' do
+        status = sender.statuses.first
+
+        expect(status).to_not be_nil
+        expect(status.text).to eq 'Lorem ipsum'
+      end
+    end
+
+    context 'when sender targets a local user' do
+      let!(:local_account) { Fabricate(:account) }
+
+      subject { described_class.new(json, sender, delivery: true) }
+
+      before do
+        subject.perform
+      end
+
+      let(:object_json) do
+        {
+          id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+          type: 'Note',
+          content: 'Lorem ipsum',
+          to: ActivityPub::TagManager.instance.uri_for(local_account),
+        }
+      end
+
+      it 'creates status' do
+        status = sender.statuses.first
+
+        expect(status).to_not be_nil
+        expect(status.text).to eq 'Lorem ipsum'
+      end
+    end
+
+    context 'when sender cc\'s a local user' do
+      let!(:local_account) { Fabricate(:account) }
+
+      subject { described_class.new(json, sender, delivery: true) }
+
+      before do
+        subject.perform
+      end
+
+      let(:object_json) do
+        {
+          id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+          type: 'Note',
+          content: 'Lorem ipsum',
+          cc: ActivityPub::TagManager.instance.uri_for(local_account),
+        }
+      end
+
+      it 'creates status' do
+        status = sender.statuses.first
+
+        expect(status).to_not be_nil
+        expect(status.text).to eq 'Lorem ipsum'
+      end
+    end
+
+    context 'when the sender has no relevance to local activity' do
+      subject { described_class.new(json, sender, delivery: true) }
+
+      before do
+        subject.perform
+      end
+
+      let(:object_json) do
+        {
+          id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+          type: 'Note',
+          content: 'Lorem ipsum',
+        }
+      end
+
+      it 'does not create anything' do
+        expect(sender.statuses.count).to eq 0
+      end
+    end
+  end
+end

spec/lib/activitypub/activity/delete_spec.rb

@@ -0,0 +1,52 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Delete do
+  let(:sender) { Fabricate(:account, domain: 'example.com') }
+  let(:status) { Fabricate(:status, account: sender, uri: 'foobar') }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Delete',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: ActivityPub::TagManager.instance.uri_for(status),
+      signature: 'foo',
+    }.with_indifferent_access
+  end
+
+  describe '#perform' do
+    subject { described_class.new(json, sender) }
+
+    before do
+      subject.perform
+    end
+
+    it 'deletes sender\'s status' do
+      expect(Status.find_by(id: status.id)).to be_nil
+    end
+  end
+
+  context 'when the status has been reblogged' do
+    describe '#perform' do
+      subject { described_class.new(json, sender) }
+      let!(:reblogger) { Fabricate(:account) }
+      let!(:follower)  { Fabricate(:account, username: 'follower', protocol: :activitypub, domain: 'example.com', inbox_url: 'http://example.com/inbox') }
+      let!(:reblog)    { Fabricate(:status, account: reblogger, reblog: status) }
+
+      before do
+        stub_request(:post, 'http://example.com/inbox').to_return(status: 200)
+        follower.follow!(reblogger)
+        subject.perform
+      end
+
+      it 'deletes sender\'s status' do
+        expect(Status.find_by(id: status.id)).to be_nil
+      end
+
+      it 'sends delete activity to followers of rebloggers' do
+        expect(a_request(:post, 'http://example.com/inbox')).to have_been_made.once
+      end
+    end
+  end
+end

spec/lib/activitypub/activity/flag_spec.rb

@@ -0,0 +1,56 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Flag do
+  let(:sender)  { Fabricate(:account, domain: 'example.com', uri: 'http://example.com/account') }
+  let(:flagged) { Fabricate(:account) }
+  let(:status)  { Fabricate(:status, account: flagged, uri: 'foobar') }
+  let(:flag_id) { nil }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: flag_id,
+      type: 'Flag',
+      content: 'Boo!!',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: [
+        ActivityPub::TagManager.instance.uri_for(flagged),
+        ActivityPub::TagManager.instance.uri_for(status),
+      ],
+    }.with_indifferent_access
+  end
+
+  describe '#perform' do
+    subject { described_class.new(json, sender) }
+
+    before do
+      subject.perform
+    end
+
+    it 'creates a report' do
+      report = Report.find_by(account: sender, target_account: flagged)
+
+      expect(report).to_not be_nil
+      expect(report.comment).to eq 'Boo!!'
+      expect(report.status_ids).to eq [status.id]
+    end
+  end
+
+  describe '#perform with a defined uri' do
+    subject { described_class.new(json, sender) }
+    let (:flag_id) { 'http://example.com/reports/1' }
+
+    before do
+      subject.perform
+    end
+
+    it 'creates a report' do
+      report = Report.find_by(account: sender, target_account: flagged)
+
+      expect(report).to_not be_nil
+      expect(report.comment).to eq 'Boo!!'
+      expect(report.status_ids).to eq [status.id]
+      expect(report.uri).to eq flag_id
+    end
+  end
+end

spec/lib/activitypub/activity/follow_spec.rb

@@ -0,0 +1,49 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Follow do
+  let(:sender)    { Fabricate(:account) }
+  let(:recipient) { Fabricate(:account) }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Follow',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: ActivityPub::TagManager.instance.uri_for(recipient),
+    }.with_indifferent_access
+  end
+
+  describe '#perform' do
+    subject { described_class.new(json, sender) }
+
+    context 'unlocked account' do
+      before do
+        subject.perform
+      end
+
+      it 'creates a follow from sender to recipient' do
+        expect(sender.following?(recipient)).to be true
+      end
+
+      it 'does not create a follow request' do
+        expect(sender.requested?(recipient)).to be false
+      end
+    end
+
+    context 'locked account' do
+      before do
+        recipient.update(locked: true)
+        subject.perform
+      end
+
+      it 'does not create a follow from sender to recipient' do
+        expect(sender.following?(recipient)).to be false
+      end
+
+      it 'creates a follow request' do
+        expect(sender.requested?(recipient)).to be true
+      end
+    end
+  end
+end

spec/lib/activitypub/activity/like_spec.rb

@@ -0,0 +1,29 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Like do
+  let(:sender)    { Fabricate(:account) }
+  let(:recipient) { Fabricate(:account) }
+  let(:status)    { Fabricate(:status, account: recipient) }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Like',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: ActivityPub::TagManager.instance.uri_for(status),
+    }.with_indifferent_access
+  end
+
+  describe '#perform' do
+    subject { described_class.new(json, sender) }
+
+    before do
+      subject.perform
+    end
+
+    it 'creates a favourite from sender to status' do
+      expect(sender.favourited?(status)).to be true
+    end
+  end
+end

spec/lib/activitypub/activity/move_spec.rb

@@ -0,0 +1,52 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Move do
+  let(:follower)    { Fabricate(:account) }
+  let(:old_account) { Fabricate(:account) }
+  let(:new_account) { Fabricate(:account) }
+
+  before do
+    follower.follow!(old_account)
+
+    old_account.update!(uri: 'https://example.org/alice', domain: 'example.org', protocol: :activitypub, inbox_url: 'https://example.org/inbox')
+    new_account.update!(uri: 'https://example.com/alice', domain: 'example.com', protocol: :activitypub, inbox_url: 'https://example.com/inbox', also_known_as: [old_account.uri])
+
+    stub_request(:post, 'https://example.org/inbox').to_return(status: 200)
+    stub_request(:post, 'https://example.com/inbox').to_return(status: 200)
+
+    service_stub = double
+    allow(ActivityPub::FetchRemoteAccountService).to receive(:new).and_return(service_stub)
+    allow(service_stub).to receive(:call).and_return(new_account)
+  end
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Move',
+      actor: old_account.uri,
+      object: old_account.uri,
+      target: new_account.uri,
+    }.with_indifferent_access
+  end
+
+  describe '#perform' do
+    subject { described_class.new(json, old_account) }
+
+    before do
+      subject.perform
+    end
+
+    it 'sets moved account on old account' do
+      expect(old_account.reload.moved_to_account_id).to eq new_account.id
+    end
+
+    it 'makes followers unfollow old account' do
+      expect(follower.following?(old_account)).to be false
+    end
+
+    it 'makes followers follow-request the new account' do
+      expect(follower.requested?(new_account)).to be true
+    end
+  end
+end

spec/lib/activitypub/activity/reject_spec.rb

@@ -0,0 +1,64 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Reject do
+  let(:sender)    { Fabricate(:account) }
+  let(:recipient) { Fabricate(:account) }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Reject',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: {
+        id: 'bar',
+        type: 'Follow',
+        actor: ActivityPub::TagManager.instance.uri_for(recipient),
+        object: ActivityPub::TagManager.instance.uri_for(sender),
+      },
+    }.with_indifferent_access
+  end
+
+  describe '#perform' do
+    subject { described_class.new(json, sender) }
+
+    before do
+      Fabricate(:follow_request, account: recipient, target_account: sender)
+      subject.perform
+    end
+
+    it 'does not create a follow relationship' do
+      expect(recipient.following?(sender)).to be false
+    end
+
+    it 'removes the follow request' do
+      expect(recipient.requested?(sender)).to be false
+    end
+  end
+
+  context 'given a relay' do
+    let!(:relay) { Fabricate(:relay, state: :pending, follow_activity_id: 'https://abc-123/456') }
+
+    let(:json) do
+      {
+        '@context': 'https://www.w3.org/ns/activitystreams',
+        id: 'foo',
+        type: 'Reject',
+        actor: ActivityPub::TagManager.instance.uri_for(sender),
+        object: {
+          id: 'https://abc-123/456',
+          type: 'Follow',
+          actor: ActivityPub::TagManager.instance.uri_for(recipient),
+          object: ActivityPub::TagManager.instance.uri_for(sender),
+        },
+      }.with_indifferent_access
+    end
+
+    subject { described_class.new(json, sender) }
+
+    it 'marks the relay as rejected' do
+      subject.perform
+      expect(relay.reload.rejected?).to be true
+    end
+  end
+end

spec/lib/activitypub/activity/remove_spec.rb

@@ -0,0 +1,30 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Remove do
+  let(:sender) { Fabricate(:account, featured_collection_url: 'https://example.com/featured') }
+  let(:status) { Fabricate(:status, account: sender) }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Add',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: ActivityPub::TagManager.instance.uri_for(status),
+      target: sender.featured_collection_url,
+    }.with_indifferent_access
+  end
+
+  describe '#perform' do
+    subject { described_class.new(json, sender) }
+
+    before do
+      StatusPin.create!(account: sender, status: status)
+      subject.perform
+    end
+
+    it 'removes a pin' do
+      expect(sender.pinned?(status)).to be false
+    end
+  end
+end

spec/lib/activitypub/activity/undo_spec.rb

@@ -0,0 +1,147 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Undo do
+  let(:sender) { Fabricate(:account, domain: 'example.com') }
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Undo',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: object_json,
+    }.with_indifferent_access
+  end
+
+  subject { described_class.new(json, sender) }
+
+  describe '#perform' do
+    context 'with Announce' do
+      let(:status) { Fabricate(:status) }
+
+      let(:object_json) do
+        {
+          id: 'bar',
+          type: 'Announce',
+          actor: ActivityPub::TagManager.instance.uri_for(sender),
+          object: ActivityPub::TagManager.instance.uri_for(status),
+          atomUri: 'barbar',
+        }
+      end
+
+      context do
+        before do
+          Fabricate(:status, reblog: status, account: sender, uri: 'bar')
+        end
+
+        it 'deletes the reblog' do
+          subject.perform
+          expect(sender.reblogged?(status)).to be false
+        end
+      end
+
+      context 'with atomUri' do
+        before do
+          Fabricate(:status, reblog: status, account: sender, uri: 'barbar')
+        end
+
+        it 'deletes the reblog by atomUri' do
+          subject.perform
+          expect(sender.reblogged?(status)).to be false
+        end
+      end
+    end
+
+    context 'with Accept' do
+      let(:recipient) { Fabricate(:account) }
+      let(:object_json) do
+        {
+          id: 'bar',
+          type: 'Accept',
+          actor: ActivityPub::TagManager.instance.uri_for(sender),
+          object: 'follow-to-revoke',
+        }
+      end
+
+      before do
+        recipient.follow!(sender, uri: 'follow-to-revoke')
+      end
+
+      it 'deletes follow from recipient to sender' do
+        subject.perform
+        expect(recipient.following?(sender)).to be false
+      end
+
+      it 'creates a follow request from recipient to sender' do
+        subject.perform
+        expect(recipient.requested?(sender)).to be true
+      end
+    end
+
+    context 'with Block' do
+      let(:recipient) { Fabricate(:account) }
+
+      let(:object_json) do
+        {
+          id: 'bar',
+          type: 'Block',
+          actor: ActivityPub::TagManager.instance.uri_for(sender),
+          object: ActivityPub::TagManager.instance.uri_for(recipient),
+        }
+      end
+
+      before do
+        sender.block!(recipient)
+      end
+
+      it 'deletes block from sender to recipient' do
+        subject.perform
+        expect(sender.blocking?(recipient)).to be false
+      end
+    end
+
+    context 'with Follow' do
+      let(:recipient) { Fabricate(:account) }
+
+      let(:object_json) do
+        {
+          id: 'bar',
+          type: 'Follow',
+          actor: ActivityPub::TagManager.instance.uri_for(sender),
+          object: ActivityPub::TagManager.instance.uri_for(recipient),
+        }
+      end
+
+      before do
+        sender.follow!(recipient)
+      end
+
+      it 'deletes follow from sender to recipient' do
+        subject.perform
+        expect(sender.following?(recipient)).to be false
+      end
+    end
+
+    context 'with Like' do
+      let(:status) { Fabricate(:status) }
+
+      let(:object_json) do
+        {
+          id: 'bar',
+          type: 'Like',
+          actor: ActivityPub::TagManager.instance.uri_for(sender),
+          object: ActivityPub::TagManager.instance.uri_for(status),
+        }
+      end
+
+      before do
+        Fabricate(:favourite, account: sender, status: status)
+      end
+
+      it 'deletes favourite from sender to status' do
+        subject.perform
+        expect(sender.favourited?(status)).to be false
+      end
+    end
+  end
+end

spec/lib/activitypub/activity/update_spec.rb

@@ -0,0 +1,46 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Activity::Update do
+  let!(:sender) { Fabricate(:account) }
+
+  before do
+    stub_request(:get, actor_json[:outbox]).to_return(status: 404)
+    stub_request(:get, actor_json[:followers]).to_return(status: 404)
+    stub_request(:get, actor_json[:following]).to_return(status: 404)
+    stub_request(:get, actor_json[:featured]).to_return(status: 404)
+
+    sender.update!(uri: ActivityPub::TagManager.instance.uri_for(sender))
+  end
+
+  let(:modified_sender) do
+    sender.dup.tap do |modified_sender|
+      modified_sender.display_name = 'Totally modified now'
+    end
+  end
+
+  let(:actor_json) do
+    ActiveModelSerializers::SerializableResource.new(modified_sender, serializer: ActivityPub::ActorSerializer, key_transform: :camel_lower).as_json
+  end
+
+  let(:json) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'foo',
+      type: 'Update',
+      actor: ActivityPub::TagManager.instance.uri_for(sender),
+      object: actor_json,
+    }.with_indifferent_access
+  end
+
+  describe '#perform' do
+    subject { described_class.new(json, sender) }
+
+    before do
+      subject.perform
+    end
+
+    it 'updates profile' do
+      expect(sender.reload.display_name).to eq 'Totally modified now'
+    end
+  end
+end

spec/lib/activitypub/adapter_spec.rb

@@ -0,0 +1,88 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Adapter do
+  class TestObject < ActiveModelSerializers::Model
+    attributes :foo
+  end
+
+  class TestWithBasicContextSerializer < ActivityPub::Serializer
+    attributes :foo
+  end
+
+  class TestWithNamedContextSerializer < ActivityPub::Serializer
+    context :security
+    attributes :foo
+  end
+
+  class TestWithNestedNamedContextSerializer < ActivityPub::Serializer
+    attributes :foo
+
+    has_one :virtual_object, key: :baz, serializer: TestWithNamedContextSerializer
+
+    def virtual_object
+      object
+    end
+  end
+
+  class TestWithContextExtensionSerializer < ActivityPub::Serializer
+    context_extensions :sensitive
+    attributes :foo
+  end
+
+  class TestWithNestedContextExtensionSerializer < ActivityPub::Serializer
+    context_extensions :manually_approves_followers
+    attributes :foo
+
+    has_one :virtual_object, key: :baz, serializer: TestWithContextExtensionSerializer
+
+    def virtual_object
+      object
+    end
+  end
+
+  describe '#serializable_hash' do
+    let(:serializer_class) {}
+
+    subject { ActiveModelSerializers::SerializableResource.new(TestObject.new(foo: 'bar'), serializer: serializer_class, adapter: described_class).as_json }
+
+    context 'when serializer defines no context' do
+      let(:serializer_class) { TestWithBasicContextSerializer }
+
+      it 'renders a basic @context' do
+        expect(subject).to include({ '@context' => 'https://www.w3.org/ns/activitystreams' })
+      end
+    end
+
+    context 'when serializer defines a named context' do
+      let(:serializer_class) { TestWithNamedContextSerializer }
+
+      it 'renders a @context with both items' do
+        expect(subject).to include({ '@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1'] })
+      end
+    end
+
+    context 'when serializer has children that define a named context' do
+      let(:serializer_class) { TestWithNestedNamedContextSerializer }
+
+      it 'renders a @context with both items' do
+        expect(subject).to include({ '@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1'] })
+      end
+    end
+
+    context 'when serializer defines context extensions' do
+      let(:serializer_class) { TestWithContextExtensionSerializer }
+
+      it 'renders a @context with the extension' do
+        expect(subject).to include({ '@context' => ['https://www.w3.org/ns/activitystreams', { 'sensitive' => 'as:sensitive' }] })
+      end
+    end
+
+    context 'when serializer has children that define context extensions' do
+      let(:serializer_class) { TestWithNestedContextExtensionSerializer }
+
+      it 'renders a @context with both extensions' do
+        expect(subject).to include({ '@context' => ['https://www.w3.org/ns/activitystreams', { 'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers', 'sensitive' => 'as:sensitive' }] })
+      end
+    end
+  end
+end

spec/lib/activitypub/linked_data_signature_spec.rb

@@ -0,0 +1,86 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::LinkedDataSignature do
+  include JsonLdHelper
+
+  let!(:sender) { Fabricate(:account, uri: 'http://example.com/alice') }
+
+  let(:raw_json) do
+    {
+      '@context' => 'https://www.w3.org/ns/activitystreams',
+      'id' => 'http://example.com/hello-world',
+    }
+  end
+
+  let(:json) { raw_json.merge('signature' => signature) }
+
+  subject { described_class.new(json) }
+
+  before do
+    stub_jsonld_contexts!
+  end
+
+  describe '#verify_account!' do
+    context 'when signature matches' do
+      let(:raw_signature) do
+        {
+          'creator' => 'http://example.com/alice',
+          'created' => '2017-09-23T20:21:34Z',
+        }
+      end
+
+      let(:signature) { raw_signature.merge('type' => 'RsaSignature2017', 'signatureValue' => sign(sender, raw_signature, raw_json)) }
+
+      it 'returns creator' do
+        expect(subject.verify_account!).to eq sender
+      end
+    end
+
+    context 'when signature is missing' do
+      let(:signature) { nil }
+
+      it 'returns nil' do
+        expect(subject.verify_account!).to be_nil
+      end
+    end
+
+    context 'when signature is tampered' do
+      let(:raw_signature) do
+        {
+          'creator' => 'http://example.com/alice',
+          'created' => '2017-09-23T20:21:34Z',
+        }
+      end
+
+      let(:signature) { raw_signature.merge('type' => 'RsaSignature2017', 'signatureValue' => 's69F3mfddd99dGjmvjdjjs81e12jn121Gkm1') }
+
+      it 'returns nil' do
+        expect(subject.verify_account!).to be_nil
+      end
+    end
+  end
+
+  describe '#sign!' do
+    subject { described_class.new(raw_json).sign!(sender) }
+
+    it 'returns a hash' do
+      expect(subject).to be_a Hash
+    end
+
+    it 'contains signature' do
+      expect(subject['signature']).to be_a Hash
+      expect(subject['signature']['signatureValue']).to be_present
+    end
+
+    it 'can be verified again' do
+      expect(described_class.new(subject).verify_account!).to eq sender
+    end
+  end
+
+  def sign(from_account, options, document)
+    options_hash   = Digest::SHA256.hexdigest(canonicalize(options.merge('@context' => ActivityPub::LinkedDataSignature::CONTEXT)))
+    document_hash  = Digest::SHA256.hexdigest(canonicalize(document))
+    to_be_verified = options_hash + document_hash
+    Base64.strict_encode64(from_account.keypair.sign(OpenSSL::Digest::SHA256.new, to_be_verified))
+  end
+end

spec/lib/activitypub/tag_manager_spec.rb

@@ -0,0 +1,157 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::TagManager do
+  include RoutingHelper
+
+  subject { described_class.instance }
+
+  describe '#url_for' do
+    it 'returns a string' do
+      account = Fabricate(:account)
+      expect(subject.url_for(account)).to be_a String
+    end
+  end
+
+  describe '#uri_for' do
+    it 'returns a string' do
+      account = Fabricate(:account)
+      expect(subject.uri_for(account)).to be_a String
+    end
+  end
+
+  describe '#to' do
+    it 'returns public collection for public status' do
+      status = Fabricate(:status, visibility: :public)
+      expect(subject.to(status)).to eq ['https://www.w3.org/ns/activitystreams#Public']
+    end
+
+    it 'returns followers collection for unlisted status' do
+      status = Fabricate(:status, visibility: :unlisted)
+      expect(subject.to(status)).to eq [account_followers_url(status.account)]
+    end
+
+    it 'returns followers collection for private status' do
+      status = Fabricate(:status, visibility: :private)
+      expect(subject.to(status)).to eq [account_followers_url(status.account)]
+    end
+
+    it 'returns URIs of mentions for direct status' do
+      status    = Fabricate(:status, visibility: :direct)
+      mentioned = Fabricate(:account)
+      status.mentions.create(account: mentioned)
+      expect(subject.to(status)).to eq [subject.uri_for(mentioned)]
+    end
+
+    it "returns URIs of mentions for direct silenced author's status only if they are followers or requesting to be" do
+      bob    = Fabricate(:account, username: 'bob')
+      alice  = Fabricate(:account, username: 'alice')
+      foo    = Fabricate(:account)
+      author = Fabricate(:account, username: 'author', silenced: true)
+      status = Fabricate(:status, visibility: :direct, account: author)
+      bob.follow!(author)
+      FollowRequest.create!(account: foo, target_account: author)
+      status.mentions.create(account: alice)
+      status.mentions.create(account: bob)
+      status.mentions.create(account: foo)
+      expect(subject.to(status)).to include(subject.uri_for(bob))
+      expect(subject.to(status)).to include(subject.uri_for(foo))
+      expect(subject.to(status)).to_not include(subject.uri_for(alice))
+    end
+  end
+
+  describe '#cc' do
+    it 'returns followers collection for public status' do
+      status = Fabricate(:status, visibility: :public)
+      expect(subject.cc(status)).to eq [account_followers_url(status.account)]
+    end
+
+    it 'returns public collection for unlisted status' do
+      status = Fabricate(:status, visibility: :unlisted)
+      expect(subject.cc(status)).to eq ['https://www.w3.org/ns/activitystreams#Public']
+    end
+
+    it 'returns empty array for private status' do
+      status = Fabricate(:status, visibility: :private)
+      expect(subject.cc(status)).to eq []
+    end
+
+    it 'returns empty array for direct status' do
+      status = Fabricate(:status, visibility: :direct)
+      expect(subject.cc(status)).to eq []
+    end
+
+    it 'returns URIs of mentions for non-direct status' do
+      status    = Fabricate(:status, visibility: :public)
+      mentioned = Fabricate(:account)
+      status.mentions.create(account: mentioned)
+      expect(subject.cc(status)).to include(subject.uri_for(mentioned))
+    end
+
+    it "returns URIs of mentions for silenced author's non-direct status only if they are followers or requesting to be" do
+      bob    = Fabricate(:account, username: 'bob')
+      alice  = Fabricate(:account, username: 'alice')
+      foo    = Fabricate(:account)
+      author = Fabricate(:account, username: 'author', silenced: true)
+      status = Fabricate(:status, visibility: :public, account: author)
+      bob.follow!(author)
+      FollowRequest.create!(account: foo, target_account: author)
+      status.mentions.create(account: alice)
+      status.mentions.create(account: bob)
+      status.mentions.create(account: foo)
+      expect(subject.cc(status)).to include(subject.uri_for(bob))
+      expect(subject.cc(status)).to include(subject.uri_for(foo))
+      expect(subject.cc(status)).to_not include(subject.uri_for(alice))
+    end
+  end
+
+  describe '#local_uri?' do
+    it 'returns false for non-local URI' do
+      expect(subject.local_uri?('http://example.com/123')).to be false
+    end
+
+    it 'returns true for local URIs' do
+      account = Fabricate(:account)
+      expect(subject.local_uri?(subject.uri_for(account))).to be true
+    end
+  end
+
+  describe '#uri_to_local_id' do
+    it 'returns the local ID' do
+      account = Fabricate(:account)
+      expect(subject.uri_to_local_id(subject.uri_for(account), :username)).to eq account.username
+    end
+  end
+
+  describe '#uri_to_resource' do
+    it 'returns the local account' do
+      account = Fabricate(:account)
+      expect(subject.uri_to_resource(subject.uri_for(account), Account)).to eq account
+    end
+
+    it 'returns the remote account by matching URI without fragment part' do
+      account = Fabricate(:account, uri: 'https://example.com/123')
+      expect(subject.uri_to_resource('https://example.com/123#456', Account)).to eq account
+    end
+
+    it 'returns the local status for ActivityPub URI' do
+      status = Fabricate(:status)
+      expect(subject.uri_to_resource(subject.uri_for(status), Status)).to eq status
+    end
+
+    it 'returns the local status for OStatus tag: URI' do
+      status = Fabricate(:status)
+      expect(subject.uri_to_resource(OStatus::TagManager.instance.uri_for(status), Status)).to eq status
+    end
+
+    it 'returns the local status for OStatus StreamEntry URL' do
+      status = Fabricate(:status)
+      stream_entry_url = account_stream_entry_url(status.account, status.stream_entry)
+      expect(subject.uri_to_resource(stream_entry_url, Status)).to eq status
+    end
+
+    it 'returns the remote status by matching URI without fragment part' do
+      status = Fabricate(:status, uri: 'https://example.com/123')
+      expect(subject.uri_to_resource('https://example.com/123#456', Status)).to eq status
+    end
+  end
+end