Add more tests for ActivityPub controllers (#13585)

19 files changed, 1315 insertions, 142 deletions

diff --git a/app/controllers/accounts_controller.rb b/app/controllers/accounts_controller.rb
index 124393d62..b35b2279e 100644
--- a/app/controllers/accounts_controller.rb
+++ b/app/controllers/accounts_controller.rb
@@ -27,7 +27,7 @@ class AccountsController < ApplicationController
         end
 
         @pinned_statuses = cache_collection(@account.pinned_statuses, Status) if show_pinned_statuses?
-        @statuses        = filtered_status_page(params)
+        @statuses        = filtered_status_page
         @statuses        = cache_collection(@statuses, Status)
         @rss_url         = rss_url
 
@@ -140,12 +140,12 @@ class AccountsController < ApplicationController
     request.path.split('.').first.ends_with?(Addressable::URI.parse("/tagged/#{params[:tag]}").normalize)
   end
 
-  def filtered_status_page(params)
-    if params[:min_id].present?
-      filtered_statuses.paginate_by_min_id(PAGE_SIZE, params[:min_id]).reverse
-    else
-      filtered_statuses.paginate_by_max_id(PAGE_SIZE, params[:max_id], params[:since_id]).to_a
-    end
+  def filtered_status_page
+    filtered_statuses.paginate_by_id(PAGE_SIZE, params_slice(:max_id, :min_id, :since_id))
+  end
+
+  def params_slice(*keys)
+    params.slice(*keys).permit(*keys)
   end
 
   def restrict_fields_to
diff --git a/app/controllers/activitypub/collections_controller.rb b/app/controllers/activitypub/collections_controller.rb
index 910fefb1c..c1e7aa550 100644
--- a/app/controllers/activitypub/collections_controller.rb
+++ b/app/controllers/activitypub/collections_controller.rb
@@ -24,20 +24,23 @@ class ActivityPub::CollectionsController < ActivityPub::BaseController
   def set_size
     case params[:id]
     when 'featured'
-      @account.pinned_statuses.count
+      @size = @account.pinned_statuses.count
     else
-      raise ActiveRecord::RecordNotFound
+      not_found
     end
   end
 
   def scope_for_collection
     case params[:id]
     when 'featured'
-      return Status.none if @account.blocking?(signed_request_account)
-
-      @account.pinned_statuses
-    else
-      raise ActiveRecord::RecordNotFound
+      # Because in public fetch mode we cache the response, there would be no
+      # benefit from performing the check below, since a blocked account or domain
+      # would likely be served the cache from the reverse proxy anyway
+      if authorized_fetch_mode? && !signed_request_account.nil? && (@account.blocking?(signed_request_account) || (!signed_request_account.domain.nil? && @account.domain_blocking?(signed_request_account.domain)))
+        Status.none
+      else
+        @account.pinned_statuses
+      end
     end
   end
 
diff --git a/app/controllers/activitypub/outboxes_controller.rb b/app/controllers/activitypub/outboxes_controller.rb
index 891756b7e..e25a4bc07 100644
--- a/app/controllers/activitypub/outboxes_controller.rb
+++ b/app/controllers/activitypub/outboxes_controller.rb
@@ -11,7 +11,7 @@ class ActivityPub::OutboxesController < ActivityPub::BaseController
   before_action :set_cache_headers
 
   def show
-    expires_in(page_requested? ? 0 : 3.minutes, public: public_fetch_mode?)
+    expires_in(page_requested? ? 0 : 3.minutes, public: public_fetch_mode? && !(signed_request_account.present? && page_requested?))
     render json: outbox_presenter, serializer: ActivityPub::OutboxSerializer, adapter: ActivityPub::Adapter, content_type: 'application/activity+json'
   end
 
@@ -50,12 +50,12 @@ class ActivityPub::OutboxesController < ActivityPub::BaseController
     return unless page_requested?
 
     @statuses = @account.statuses.permitted_for(@account, signed_request_account)
-    @statuses = params[:min_id].present? ? @statuses.paginate_by_min_id(LIMIT, params[:min_id]).reverse : @statuses.paginate_by_max_id(LIMIT, params[:max_id])
+    @statuses = @statuses.paginate_by_id(LIMIT, params_slice(:max_id, :min_id, :since_id))
     @statuses = cache_collection(@statuses, Status)
   end
 
   def page_requested?
-    params[:page] == 'true'
+    truthy_param?(:page)
   end
 
   def page_params
diff --git a/app/controllers/activitypub/replies_controller.rb b/app/controllers/activitypub/replies_controller.rb
index c62061555..43bf4e657 100644
--- a/app/controllers/activitypub/replies_controller.rb
+++ b/app/controllers/activitypub/replies_controller.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class ActivityPub::RepliesController < ActivityPub::BaseController
-  include SignatureAuthentication
+  include SignatureVerification
   include Authorization
   include AccountOwnedConcern
 
@@ -19,15 +19,19 @@ class ActivityPub::RepliesController < ActivityPub::BaseController
 
   private
 
+  def pundit_user
+    signed_request_account
+  end
+
   def set_status
     @status = @account.statuses.find(params[:status_id])
     authorize @status, :show?
   rescue Mastodon::NotPermittedError
-    raise ActiveRecord::RecordNotFound
+    not_found
   end
 
   def set_replies
-    @replies = page_params[:only_other_accounts] ? Status.where.not(account_id: @account.id) : @account.statuses
+    @replies = only_other_accounts? ? Status.where.not(account_id: @account.id) : @account.statuses
     @replies = @replies.where(in_reply_to_id: @status.id, visibility: [:public, :unlisted])
     @replies = @replies.paginate_by_min_id(DESCENDANTS_LIMIT, params[:min_id])
   end
@@ -38,7 +42,7 @@ class ActivityPub::RepliesController < ActivityPub::BaseController
       type: :unordered,
       part_of: account_status_replies_url(@account, @status),
       next: next_page,
-      items: @replies.map { |status| status.local ? status : status.uri }
+      items: @replies.map { |status| status.local? ? status : status.uri }
     )
 
     return page if page_requested?
@@ -51,16 +55,21 @@ class ActivityPub::RepliesController < ActivityPub::BaseController
   end
 
   def page_requested?
-    params[:page] == 'true'
+    truthy_param?(:page)
+  end
+
+  def only_other_accounts?
+    truthy_param?(:only_other_accounts)
   end
 
   def next_page
     only_other_accounts = !(@replies&.last&.account_id == @account.id && @replies.size == DESCENDANTS_LIMIT)
+
     account_status_replies_url(
       @account,
       @status,
       page: true,
-      min_id: only_other_accounts && !page_params[:only_other_accounts] ? nil : @replies&.last&.id,
+      min_id: only_other_accounts && !only_other_accounts? ? nil : @replies&.last&.id,
       only_other_accounts: only_other_accounts
     )
   end
diff --git a/app/controllers/api/v1/polls/votes_controller.rb b/app/controllers/api/v1/polls/votes_controller.rb
index e1d26106a..513b937ef 100644
--- a/app/controllers/api/v1/polls/votes_controller.rb
+++ b/app/controllers/api/v1/polls/votes_controller.rb
@@ -18,7 +18,7 @@ class Api::V1::Polls::VotesController < Api::BaseController
     @poll = Poll.attached.find(params[:poll_id])
     authorize @poll.status, :show?
   rescue Mastodon::NotPermittedError
-    raise ActiveRecord::RecordNotFound
+    not_found
   end
 
   def vote_params
diff --git a/app/controllers/api/v1/polls_controller.rb b/app/controllers/api/v1/polls_controller.rb
index 744baf7bb..6435e9f0d 100644
--- a/app/controllers/api/v1/polls_controller.rb
+++ b/app/controllers/api/v1/polls_controller.rb
@@ -17,7 +17,7 @@ class Api::V1::PollsController < Api::BaseController
     @poll = Poll.attached.find(params[:id])
     authorize @poll.status, :show?
   rescue Mastodon::NotPermittedError
-    raise ActiveRecord::RecordNotFound
+    not_found
   end
 
   def refresh_poll
diff --git a/app/controllers/api/v1/push/subscriptions_controller.rb b/app/controllers/api/v1/push/subscriptions_controller.rb
index 1cbc92b93..d34b333eb 100644
--- a/app/controllers/api/v1/push/subscriptions_controller.rb
+++ b/app/controllers/api/v1/push/subscriptions_controller.rb
@@ -4,6 +4,7 @@ class Api::V1::Push::SubscriptionsController < Api::BaseController
   before_action -> { doorkeeper_authorize! :push }
   before_action :require_user!
   before_action :set_web_push_subscription
+  before_action :check_web_push_subscription, only: [:show, :update]
 
   def create
     @web_subscription&.destroy!
@@ -21,16 +22,11 @@ class Api::V1::Push::SubscriptionsController < Api::BaseController
   end
 
   def show
-    raise ActiveRecord::RecordNotFound if @web_subscription.nil?
-
     render json: @web_subscription, serializer: REST::WebPushSubscriptionSerializer
   end
 
   def update
-    raise ActiveRecord::RecordNotFound if @web_subscription.nil?
-
     @web_subscription.update!(data: data_params)
-
     render json: @web_subscription, serializer: REST::WebPushSubscriptionSerializer
   end
 
@@ -45,12 +41,17 @@ class Api::V1::Push::SubscriptionsController < Api::BaseController
     @web_subscription = ::Web::PushSubscription.find_by(access_token_id: doorkeeper_token.id)
   end
 
+  def check_web_push_subscription
+    not_found if @web_subscription.nil?
+  end
+
   def subscription_params
     params.require(:subscription).permit(:endpoint, keys: [:auth, :p256dh])
   end
 
   def data_params
     return {} if params[:data].blank?
+
     params.require(:data).permit(alerts: [:follow, :follow_request, :favourite, :reblog, :mention, :poll])
   end
 end
diff --git a/app/controllers/api/v1/statuses/mutes_controller.rb b/app/controllers/api/v1/statuses/mutes_controller.rb
index 43c7a525a..87071a2b9 100644
--- a/app/controllers/api/v1/statuses/mutes_controller.rb
+++ b/app/controllers/api/v1/statuses/mutes_controller.rb
@@ -28,8 +28,7 @@ class Api::V1::Statuses::MutesController < Api::BaseController
     @status = Status.find(params[:status_id])
     authorize @status, :show?
   rescue Mastodon::NotPermittedError
-    # Reraise in order to get a 404 instead of a 403 error code
-    raise ActiveRecord::RecordNotFound
+    not_found
   end
 
   def set_conversation
diff --git a/app/controllers/api/v1/statuses_controller.rb b/app/controllers/api/v1/statuses_controller.rb
index 93a253cbb..8d6cb84b6 100644
--- a/app/controllers/api/v1/statuses_controller.rb
+++ b/app/controllers/api/v1/statuses_controller.rb
@@ -67,7 +67,7 @@ class Api::V1::StatusesController < Api::BaseController
     @status = Status.find(params[:id])
     authorize @status, :show?
   rescue Mastodon::NotPermittedError
-    raise ActiveRecord::RecordNotFound
+    not_found
   end
 
   def set_thread
diff --git a/app/controllers/media_controller.rb b/app/controllers/media_controller.rb
index 05cf09c28..1d166d6e7 100644
--- a/app/controllers/media_controller.rb
+++ b/app/controllers/media_controller.rb
@@ -33,7 +33,7 @@ class MediaController < ApplicationController
   def verify_permitted_status!
     authorize @media_attachment.status, :show?
   rescue Mastodon::NotPermittedError
-    raise ActiveRecord::RecordNotFound
+    not_found
   end
 
   def check_playable
diff --git a/app/controllers/remote_interaction_controller.rb b/app/controllers/remote_interaction_controller.rb
index 4073e7ac3..3b9202a5c 100644
--- a/app/controllers/remote_interaction_controller.rb
+++ b/app/controllers/remote_interaction_controller.rb
@@ -41,7 +41,7 @@ class RemoteInteractionController < ApplicationController
     @status = Status.find(params[:id])
     authorize @status, :show?
   rescue Mastodon::NotPermittedError
-    raise ActiveRecord::RecordNotFound
+    not_found
   end
 
   def set_body_classes
diff --git a/app/controllers/statuses_controller.rb b/app/controllers/statuses_controller.rb
index 4fa128303..d362b97dc 100644
--- a/app/controllers/statuses_controller.rb
+++ b/app/controllers/statuses_controller.rb
@@ -46,7 +46,7 @@ class StatusesController < ApplicationController
   end
 
   def embed
-    return not_found if @status.hidden?
+    return not_found if @status.hidden? || @status.reblog?
 
     expires_in 180, public: true
     response.headers['X-Frame-Options'] = 'ALLOWALL'
diff --git a/app/models/status.rb b/app/models/status.rb
index fef4e2596..30f86e664 100644
--- a/app/models/status.rb
+++ b/app/models/status.rb
@@ -354,7 +354,7 @@ class Status < ApplicationRecord
 
       if account.nil?
         where(visibility: visibility)
-      elsif target_account.blocking?(account) # get rid of blocked peeps
+      elsif target_account.blocking?(account) || (account.domain.present? && target_account.domain_blocking?(account.domain)) # get rid of blocked peeps
         none
       elsif account.id == target_account.id # author can see own stuff
         all
diff --git a/spec/controllers/activitypub/collections_controller_spec.rb b/spec/controllers/activitypub/collections_controller_spec.rb
index 34114cc85..56be49be3 100644
--- a/spec/controllers/activitypub/collections_controller_spec.rb
+++ b/spec/controllers/activitypub/collections_controller_spec.rb
@@ -3,21 +3,133 @@
 require 'rails_helper'
 
 RSpec.describe ActivityPub::CollectionsController, type: :controller do
-  describe 'POST #show' do
-    let(:account) { Fabricate(:account) }
+  let!(:account) { Fabricate(:account) }
+  let(:remote_account) { nil }
 
-    context 'id is "featured"' do
-      it 'returns 200 with "application/activity+json"' do
-        post :show, params: { id: 'featured', account_username: account.username }
+  before do
+    allow(controller).to receive(:signed_request_account).and_return(remote_account)
 
-        expect(response).to have_http_status(200)
-        expect(response.content_type).to eq 'application/activity+json'
+    Fabricate(:status_pin, account: account)
+    Fabricate(:status_pin, account: account)
+    Fabricate(:status, account: account, visibility: :private)
+  end
+
+  describe 'GET #show' do
+    context 'when id is "featured"' do
+      context 'without signature' do
+        let(:remote_account) { nil }
+
+        before do
+          get :show, params: { id: 'featured', 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 public Cache-Control header' do
+          expect(response.headers['Cache-Control']).to include 'public'
+        end
+
+        it 'returns orderedItems with pinned statuses' do
+          json = body_as_json
+          expect(json[:orderedItems]).to be_an Array
+          expect(json[:orderedItems].size).to eq 2
+        end
+      end
+
+      context 'with signature' do
+        let(:remote_account) { Fabricate(:account, domain: 'example.com') }
+
+        context do
+          before do
+            get :show, params: { id: 'featured', 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 public Cache-Control header' do
+            expect(response.headers['Cache-Control']).to include 'public'
+          end
+
+          it 'returns orderedItems with pinned statuses' do
+            json = body_as_json
+            expect(json[:orderedItems]).to be_an Array
+            expect(json[:orderedItems].size).to eq 2
+          end
+        end
+
+        context 'in authorized fetch mode' do
+          before do
+            allow(controller).to receive(:authorized_fetch_mode?).and_return(true)
+          end
+
+          context 'when signed request account is blocked' do
+            before do
+              account.block!(remote_account)
+              get :show, params: { id: 'featured', 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 private Cache-Control header' do
+              expect(response.headers['Cache-Control']).to include 'private'
+            end
+
+            it 'returns empty orderedItems' do
+              json = body_as_json
+              expect(json[:orderedItems]).to be_an Array
+              expect(json[:orderedItems].size).to eq 0
+            end
+          end
+
+          context 'when signed request account is domain blocked' do
+            before do
+              account.block_domain!(remote_account.domain)
+              get :show, params: { id: 'featured', 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 private Cache-Control header' do
+              expect(response.headers['Cache-Control']).to include 'private'
+            end
+
+            it 'returns empty orderedItems' do
+              json = body_as_json
+              expect(json[:orderedItems]).to be_an Array
+              expect(json[:orderedItems].size).to eq 0
+            end
+          end
+        end
       end
     end
 
-    context 'id is not "featured"' do
-      it 'returns 404' do
-        post :show, params: { id: 'hoge', account_username: account.username }
+    context 'when id is not "featured"' do
+      it 'returns http not found' do
+        get :show, params: { id: 'hoge', account_username: account.username }
         expect(response).to have_http_status(404)
       end
     end
diff --git a/spec/controllers/activitypub/inboxes_controller_spec.rb b/spec/controllers/activitypub/inboxes_controller_spec.rb
index a9ee75490..f3bc23953 100644
--- a/spec/controllers/activitypub/inboxes_controller_spec.rb
+++ b/spec/controllers/activitypub/inboxes_controller_spec.rb
@@ -3,25 +3,31 @@
 require 'rails_helper'
 
 RSpec.describe ActivityPub::InboxesController, type: :controller do
+  let(:remote_account) { nil }
+
+  before do
+    allow(controller).to receive(:signed_request_account).and_return(remote_account)
+  end
+
   describe 'POST #create' do
-    context 'with signed_request_account' do
-      it 'returns 202' do
-        allow(controller).to receive(:signed_request_account) do
-          Fabricate(:account)
-        end
+    context 'with signature' do
+      let(:remote_account) { Fabricate(:account, domain: 'example.com', protocol: :activitypub) }
 
+      before do
         post :create, body: '{}'
+      end
+
+      it 'returns http accepted' do
         expect(response).to have_http_status(202)
       end
     end
 
-    context 'without signed_request_account' do
-      it 'returns 401' do
-        allow(controller).to receive(:signed_request_account) do
-          false
-        end
-
+    context 'without signature' do
+      before do
         post :create, body: '{}'
+      end
+
+      it 'returns http not authorized' do
         expect(response).to have_http_status(401)
       end
     end
diff --git a/spec/controllers/activitypub/outboxes_controller_spec.rb b/spec/controllers/activitypub/outboxes_controller_spec.rb
index 47460b22c..03490533d 100644
--- a/spec/controllers/activitypub/outboxes_controller_spec.rb
+++ b/spec/controllers/activitypub/outboxes_controller_spec.rb
@@ -4,20 +4,174 @@ RSpec.describe ActivityPub::OutboxesController, type: :controller do
   let!(:account) { Fabricate(:account) }
 
   before do
-    Fabricate(:status, account: account)
+    Fabricate(:status, account: account, visibility: :public)
+    Fabricate(:status, account: account, visibility: :unlisted)
+    Fabricate(:status, account: account, visibility: :private)
+    Fabricate(:status, account: account, visibility: :direct)
+    Fabricate(:status, account: account, visibility: :limited)
+  end
+
+  before do
+    allow(controller).to receive(:signed_request_account).and_return(remote_account)
   end
 
   describe 'GET #show' do
-    before do
-      get :show, params: { account_username: account.username }
-    end
+    context 'without signature' do
+      let(:remote_account) { nil }
+
+      before do
+        get :show, params: { account_username: account.username, page: page }
+      end
+
+      context 'with page not requested' do
+        let(:page) { nil }
+
+        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 totalItems' do
+          json = body_as_json
+          expect(json[:totalItems]).to eq 4
+        end
 
-    it 'returns http success' do
-      expect(response).to have_http_status(200)
+        it 'returns public Cache-Control header' do
+          expect(response.headers['Cache-Control']).to include 'public'
+        end
+      end
+
+      context 'with page requested' do
+        let(:page) { 'true' }
+
+        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 public or unlisted statuses' do
+          json = body_as_json
+          expect(json[:orderedItems]).to be_an Array
+          expect(json[:orderedItems].size).to eq 2
+          expect(json[:orderedItems].all? { |item| item[:to].include?(ActivityPub::TagManager::COLLECTIONS[:public]) || item[:cc].include?(ActivityPub::TagManager::COLLECTIONS[:public]) }).to be true
+        end
+
+        it 'returns public Cache-Control header' do
+          expect(response.headers['Cache-Control']).to include 'public'
+        end
+      end
     end
 
-    it 'returns application/activity+json' do
-      expect(response.content_type).to eq 'application/activity+json'
+    context 'with signature' do
+      let(:remote_account) { Fabricate(:account, domain: 'example.com') }
+      let(:page) { 'true' }
+
+      context 'when signed request account does not follow account' do
+        before do
+          get :show, params: { account_username: account.username, page: page }
+        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 public or unlisted statuses' do
+          json = body_as_json
+          expect(json[:orderedItems]).to be_an Array
+          expect(json[:orderedItems].size).to eq 2
+          expect(json[:orderedItems].all? { |item| item[:to].include?(ActivityPub::TagManager::COLLECTIONS[:public]) || item[:cc].include?(ActivityPub::TagManager::COLLECTIONS[:public]) }).to be true
+        end
+
+        it 'returns private Cache-Control header' do
+          expect(response.headers['Cache-Control']).to eq 'max-age=0, private'
+        end
+      end
+
+      context 'when signed request account follows account' do
+        before do
+          remote_account.follow!(account)
+          get :show, params: { account_username: account.username, page: page }
+        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 private statuses' do
+          json = body_as_json
+          expect(json[:orderedItems]).to be_an Array
+          expect(json[:orderedItems].size).to eq 3
+          expect(json[:orderedItems].all? { |item| item[:to].include?(ActivityPub::TagManager::COLLECTIONS[:public]) || item[:cc].include?(ActivityPub::TagManager::COLLECTIONS[:public]) || item[:to].include?(account_followers_url(account, ActionMailer::Base.default_url_options)) }).to be true
+        end
+
+        it 'returns private Cache-Control header' do
+          expect(response.headers['Cache-Control']).to eq 'max-age=0, private'
+        end
+      end
+
+      context 'when signed request account is blocked' do
+        before do
+          account.block!(remote_account)
+          get :show, params: { account_username: account.username, page: page }
+        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 empty orderedItems' do
+          json = body_as_json
+          expect(json[:orderedItems]).to be_an Array
+          expect(json[:orderedItems].size).to eq 0
+        end
+
+        it 'returns private Cache-Control header' do
+          expect(response.headers['Cache-Control']).to eq 'max-age=0, private'
+        end
+      end
+
+      context 'when signed request account is domain blocked' do
+        before do
+          account.block_domain!(remote_account.domain)
+          get :show, params: { account_username: account.username, page: page }
+        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 empty orderedItems' do
+          json = body_as_json
+          expect(json[:orderedItems]).to be_an Array
+          expect(json[:orderedItems].size).to eq 0
+        end
+
+        it 'returns private Cache-Control header' do
+          expect(response.headers['Cache-Control']).to eq 'max-age=0, private'
+        end
+      end
     end
   end
 end
diff --git a/spec/controllers/activitypub/replies_controller_spec.rb b/spec/controllers/activitypub/replies_controller_spec.rb
new file mode 100644
index 000000000..a5ed14180
--- /dev/null
+++ b/spec/controllers/activitypub/replies_controller_spec.rb
@@ -0,0 +1,196 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe ActivityPub::RepliesController, type: :controller do
+  let(:status) { Fabricate(:status, visibility: parent_visibility) }
+  let(:remote_account) { nil }
+
+  before do
+    allow(controller).to receive(:signed_request_account).and_return(remote_account)
+
+    Fabricate(:status, thread: status, visibility: :public)
+    Fabricate(:status, thread: status, visibility: :public)
+    Fabricate(:status, thread: status, visibility: :private)
+    Fabricate(:status, account: status.account, thread: status, visibility: :public)
+    Fabricate(:status, account: status.account, thread: status, visibility: :private)
+  end
+
+  describe 'GET #index' do
+    context 'with no signature' do
+      before do
+        get :index, params: { account_username: status.account.username, status_id: status.id }
+      end
+
+      context 'when status is public' do
+        let(:parent_visibility) { :public }
+
+        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 public Cache-Control header' do
+          expect(response.headers['Cache-Control']).to include 'public'
+        end
+
+        it 'returns items with account\'s own replies' do
+          json = body_as_json
+
+          expect(json[:first]).to be_a Hash
+          expect(json[:first][:items]).to be_an Array
+          expect(json[:first][:items].size).to eq 1
+          expect(json[:first][:items].all? { |item| item[:to].include?(ActivityPub::TagManager::COLLECTIONS[:public]) || item[:cc].include?(ActivityPub::TagManager::COLLECTIONS[:public]) }).to be true
+        end
+      end
+
+      context 'when status is private' do
+        let(:parent_visibility) { :private }
+
+        it 'returns http not found' do
+          expect(response).to have_http_status(404)
+        end
+      end
+
+      context 'when status is direct' do
+        let(:parent_visibility) { :direct }
+
+        it 'returns http not found' do
+          expect(response).to have_http_status(404)
+        end
+      end
+    end
+
+    context 'with signature' do
+      let(:remote_account) { Fabricate(:account, domain: 'example.com') }
+      let(:only_other_accounts) { nil }
+
+      context do
+        before do
+          get :index, params: { account_username: status.account.username, status_id: status.id, only_other_accounts: only_other_accounts }
+        end
+
+        context 'when status is public' do
+          let(:parent_visibility) { :public }
+
+          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 public Cache-Control header' do
+            expect(response.headers['Cache-Control']).to include 'public'
+          end
+
+          context 'without only_other_accounts' do
+            it 'returns items with account\'s own replies' do
+              json = body_as_json
+
+              expect(json[:first]).to be_a Hash
+              expect(json[:first][:items]).to be_an Array
+              expect(json[:first][:items].size).to eq 1
+              expect(json[:first][:items].all? { |item| item[:to].include?(ActivityPub::TagManager::COLLECTIONS[:public]) || item[:cc].include?(ActivityPub::TagManager::COLLECTIONS[:public]) }).to be true
+            end
+          end
+
+          context 'with only_other_accounts' do
+            let(:only_other_accounts) { 'true' }
+
+            it 'returns items with other public or unlisted replies' do
+              json = body_as_json
+
+              expect(json[:first]).to be_a Hash
+              expect(json[:first][:items]).to be_an Array
+              expect(json[:first][:items].size).to eq 2
+              expect(json[:first][:items].all? { |item| item[:to].include?(ActivityPub::TagManager::COLLECTIONS[:public]) || item[:cc].include?(ActivityPub::TagManager::COLLECTIONS[:public]) }).to be true
+            end
+          end
+        end
+
+        context 'when status is private' do
+          let(:parent_visibility) { :private }
+
+          it 'returns http not found' do
+            expect(response).to have_http_status(404)
+          end
+        end
+
+        context 'when status is direct' do
+          let(:parent_visibility) { :direct }
+
+          it 'returns http not found' do
+            expect(response).to have_http_status(404)
+          end
+        end
+      end
+
+      context 'when signed request account is blocked' do
+        before do
+          status.account.block!(remote_account)
+          get :index, params: { account_username: status.account.username, status_id: status.id }
+        end
+
+        context 'when status is public' do
+          let(:parent_visibility) { :public }
+
+          it 'returns http not found' do
+            expect(response).to have_http_status(404)
+          end
+        end
+
+        context 'when status is private' do
+          let(:parent_visibility) { :private }
+
+          it 'returns http not found' do
+            expect(response).to have_http_status(404)
+          end
+        end
+
+        context 'when status is direct' do
+          let(:parent_visibility) { :direct }
+
+          it 'returns http not found' do
+            expect(response).to have_http_status(404)
+          end
+        end
+      end
+
+      context 'when signed request account is domain blocked' do
+        before do
+          status.account.block_domain!(remote_account.domain)
+          get :index, params: { account_username: status.account.username, status_id: status.id }
+        end
+
+        context 'when status is public' do
+          let(:parent_visibility) { :public }
+
+          it 'returns http not found' do
+            expect(response).to have_http_status(404)
+          end
+        end
+
+        context 'when status is private' do
+          let(:parent_visibility) { :private }
+
+          it 'returns http not found' do
+            expect(response).to have_http_status(404)
+          end
+        end
+
+        context 'when status is direct' do
+          let(:parent_visibility) { :direct }
+
+          it 'returns http not found' do
+            expect(response).to have_http_status(404)
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/spec/controllers/statuses_controller_spec.rb b/spec/controllers/statuses_controller_spec.rb
index 6905dae10..ba1f1370a 100644
--- a/spec/controllers/statuses_controller_spec.rb
+++ b/spec/controllers/statuses_controller_spec.rb
@@ -5,128 +5,821 @@ require 'rails_helper'
 describe StatusesController do
   render_views
 
-  describe '#show' do
-    context 'account is suspended' do
-      it 'returns gone' do
-        account = Fabricate(:account, suspended: true)
-        status = Fabricate(:status, account: account)
+  describe 'GET #show' do
+    let(:account) { Fabricate(:account) }
+    let(:status)  { Fabricate(:status, account: account) }
 
+    context 'when account is suspended' do
+      let(:account) { Fabricate(:account, suspended: true) }
+
+      before do
         get :show, params: { account_username: account.username, id: status.id }
+      end
 
+      it 'returns http gone' do
         expect(response).to have_http_status(410)
       end
     end
 
-    context 'status is not permitted' do
-      it 'raises ActiveRecord::RecordNotFound' do
-        user = Fabricate(:user)
-        status = Fabricate(:status)
-        status.account.block!(user.account)
+    context 'when status is a reblog' do
+      let(:original_account) { Fabricate(:account, domain: 'example.com') }
+      let(:original_status) { Fabricate(:status, account: original_account, url: 'https://example.com/123') }
+      let(:status) { Fabricate(:status, account: account, reblog: original_status) }
 
-        sign_in(user)
+      before do
         get :show, params: { account_username: status.account.username, id: status.id }
+      end
 
-        expect(response).to have_http_status(404)
+      it 'redirects to the original status' do
+        expect(response).to redirect_to(original_status.url)
       end
     end
 
-    context 'status is a reblog' do
-      it 'redirects to the original status' do
-        original_account = Fabricate(:account, domain: 'example.com')
-        original_status = Fabricate(:status, account: original_account, uri: 'tag:example.com,2017:foo', url: 'https://example.com/123')
-        status = Fabricate(:status, reblog: original_status)
+    context 'when status is public' do
+      before do
+        get :show, params: { account_username: status.account.username, id: status.id, format: format }
+      end
 
-        get :show, params: { account_username: status.account.username, id: status.id }
+      context 'as HTML' do
+        let(:format) { 'html' }
 
-        expect(response).to redirect_to(original_status.url)
+        it 'returns http success' do
+          expect(response).to have_http_status(200)
+        end
+
+        it 'returns Link header' do
+          expect(response.headers['Link'].to_s).to include 'activity+json'
+        end
+
+        it 'returns Vary header' do
+          expect(response.headers['Vary']).to eq 'Accept'
+        end
+
+        it 'returns public Cache-Control header' do
+          expect(response.headers['Cache-Control']).to include 'public'
+        end
+
+        it 'renders status' do
+          expect(response).to render_template(:show)
+          expect(response.body).to include status.text
+        end
+      end
+
+      context 'as JSON' do
+        let(:format) { 'json' }
+
+        it 'returns http success' do
+          expect(response).to have_http_status(200)
+        end
+
+        it 'returns Link header' do
+          expect(response.headers['Link'].to_s).to include 'activity+json'
+        end
+
+        it 'returns Vary header' do
+          expect(response.headers['Vary']).to eq 'Accept'
+        end
+
+        it 'returns public Cache-Control header' do
+          expect(response.headers['Cache-Control']).to include 'public'
+        end
+
+        it 'returns Content-Type header' do
+          expect(response.headers['Content-Type']).to include 'application/activity+json'
+        end
+
+        it 'renders ActivityPub Note object' do
+          json = body_as_json
+          expect(json[:content]).to include status.text
+        end
       end
     end
 
-    context 'account is not suspended and status is permitted' do
-      it 'assigns @account' do
-        status = Fabricate(:status)
-        get :show, params: { account_username: status.account.username, id: status.id }
-        expect(assigns(:account)).to eq status.account
+    context 'when status is private' do
+      let(:status) { Fabricate(:status, account: account, visibility: :private) }
+
+      before do
+        get :show, params: { account_username: status.account.username, id: status.id, format: format }
       end
 
-      it 'assigns @status' do
-        status = Fabricate(:status)
-        get :show, params: { account_username: status.account.username, id: status.id }
-        expect(assigns(:status)).to eq status
+      context 'as JSON' do
+        let(:format) { 'json' }
+
+        it 'returns http not found' do
+          expect(response).to have_http_status(404)
+        end
       end
 
-      it 'assigns @ancestors for ancestors of the status if it is a reply' do
-        ancestor = Fabricate(:status)
-        status = Fabricate(:status, in_reply_to_id: ancestor.id)
+      context 'as HTML' do
+        let(:format) { 'html' }
 
-        get :show, params: { account_username: status.account.username, id: status.id }
+        it 'returns http not found' do
+          expect(response).to have_http_status(404)
+        end
+      end
+    end
+
+    context 'when status is direct' do
+      let(:status) { Fabricate(:status, account: account, visibility: :direct) }
 
-        expect(assigns(:ancestors)).to eq [ancestor]
+      before do
+        get :show, params: { account_username: status.account.username, id: status.id, format: format }
       end
 
-      it 'assigns @ancestors for [] if it is not a reply' do
-        status = Fabricate(:status)
-        get :show, params: { account_username: status.account.username, id: status.id }
-        expect(assigns(:ancestors)).to eq []
+      context 'as JSON' do
+        let(:format) { 'json' }
+
+        it 'returns http not found' do
+          expect(response).to have_http_status(404)
+        end
       end
 
-      it 'assigns @descendant_threads for a thread with several statuses' do
-        status = Fabricate(:status)
-        child = Fabricate(:status, in_reply_to_id: status.id)
-        grandchild = Fabricate(:status, in_reply_to_id: child.id)
+      context 'as HTML' do
+        let(:format) { 'html' }
 
-        get :show, params: { account_username: status.account.username, id: status.id }
+        it 'returns http not found' do
+          expect(response).to have_http_status(404)
+        end
+      end
+    end
+
+    context 'when signed-in' do
+      let(:user) { Fabricate(:user) }
 
-        expect(assigns(:descendant_threads)[0][:statuses].pluck(:id)).to eq [child.id, grandchild.id]
+      before do
+        sign_in(user)
       end
 
-      it 'assigns @descendant_threads for several threads sharing the same descendant' do
-        status = Fabricate(:status)
-        child = Fabricate(:status, in_reply_to_id: status.id)
-        grandchildren = 2.times.map { Fabricate(:status, in_reply_to_id: child.id) }
+      context 'when account blocks user' do
+        before do
+          account.block!(user.account)
+          get :show, params: { account_username: status.account.username, id: status.id }
+        end
 
-        get :show, params: { account_username: status.account.username, id: status.id }
+        it 'returns http not found' do
+          expect(response).to have_http_status(404)
+        end
+      end
+
+      context 'when status is public' do
+        before do
+          get :show, params: { account_username: status.account.username, id: status.id, format: format }
+        end
+
+        context 'as HTML' do
+          let(:format) { 'html' }
+
+          it 'returns http success' do
+            expect(response).to have_http_status(200)
+          end
+
+          it 'returns Link header' do
+            expect(response.headers['Link'].to_s).to include 'activity+json'
+          end
 
-        expect(assigns(:descendant_threads)[0][:statuses].pluck(:id)).to eq [child.id, grandchildren[0].id]
-        expect(assigns(:descendant_threads)[1][:statuses].pluck(:id)).to eq [grandchildren[1].id]
+          it 'returns Vary header' do
+            expect(response.headers['Vary']).to eq 'Accept'
+          end
+
+          it 'returns no Cache-Control header' do
+            expect(response.headers).to_not include 'Cache-Control'
+          end
+
+          it 'renders status' do
+            expect(response).to render_template(:show)
+            expect(response.body).to include status.text
+          end
+        end
+
+        context 'as JSON' do
+          let(:format) { 'json' }
+
+          it 'returns http success' do
+            expect(response).to have_http_status(200)
+          end
+
+          it 'returns Link header' do
+            expect(response.headers['Link'].to_s).to include 'activity+json'
+          end
+
+          it 'returns Vary header' do
+            expect(response.headers['Vary']).to eq 'Accept'
+          end
+
+          it 'returns public Cache-Control header' do
+            expect(response.headers['Cache-Control']).to include 'public'
+          end
+
+          it 'returns Content-Type header' do
+            expect(response.headers['Content-Type']).to include 'application/activity+json'
+          end
+
+          it 'renders ActivityPub Note object' do
+            json = body_as_json
+            expect(json[:content]).to include status.text
+          end
+        end
       end
 
-      it 'assigns @max_descendant_thread_id for the last thread if it is hitting the status limit' do
-        stub_const 'StatusControllerConcern::DESCENDANTS_LIMIT', 1
-        status = Fabricate(:status)
-        child = Fabricate(:status, in_reply_to_id: status.id)
+      context 'when status is private' do
+        let(:status) { Fabricate(:status, account: account, visibility: :private) }
 
-        get :show, params: { account_username: status.account.username, id: status.id }
+        context 'when user is authorized to see it' do
+          before do
+            user.account.follow!(account)
+            get :show, params: { account_username: status.account.username, id: status.id, format: format }
+          end
+
+          context 'as HTML' do
+            let(:format) { 'html' }
+
+            it 'returns http success' do
+              expect(response).to have_http_status(200)
+            end
+
+            it 'returns Link header' do
+              expect(response.headers['Link'].to_s).to include 'activity+json'
+            end
+
+            it 'returns Vary header' do
+              expect(response.headers['Vary']).to eq 'Accept'
+            end
 
-        expect(assigns(:descendant_threads)).to eq []
-        expect(assigns(:max_descendant_thread_id)).to eq child.id
+            it 'returns no Cache-Control header' do
+              expect(response.headers).to_not include 'Cache-Control'
+            end
+
+            it 'renders status' do
+              expect(response).to render_template(:show)
+              expect(response.body).to include status.text
+            end
+          end
+
+          context 'as JSON' do
+            let(:format) { 'json' }
+
+            it 'returns http success' do
+              expect(response).to have_http_status(200)
+            end
+
+            it 'returns Link header' do
+              expect(response.headers['Link'].to_s).to include 'activity+json'
+            end
+
+            it 'returns Vary header' do
+              expect(response.headers['Vary']).to eq 'Accept'
+            end
+
+            it 'returns private Cache-Control header' do
+              expect(response.headers['Cache-Control']).to include 'private'
+            end
+
+            it 'returns Content-Type header' do
+              expect(response.headers['Content-Type']).to include 'application/activity+json'
+            end
+
+            it 'renders ActivityPub Note object' do
+              json = body_as_json
+              expect(json[:content]).to include status.text
+            end
+          end
+        end
+
+        context 'when user is not authorized to see it' do
+          before do
+            get :show, params: { account_username: status.account.username, id: status.id, format: format }
+          end
+
+          context 'as JSON' do
+            let(:format) { 'json' }
+
+            it 'returns http not found' do
+              expect(response).to have_http_status(404)
+            end
+          end
+
+          context 'as HTML' do
+            let(:format) { 'html' }
+
+            it 'returns http not found' do
+              expect(response).to have_http_status(404)
+            end
+          end
+        end
       end
 
-      it 'assigns @descendant_threads for threads with :next_status key if they are hitting the depth limit' do
-        stub_const 'StatusControllerConcern::DESCENDANTS_DEPTH_LIMIT', 2
-        status = Fabricate(:status)
-        child0 = Fabricate(:status, in_reply_to_id: status.id)
-        child1 = Fabricate(:status, in_reply_to_id: child0.id)
-        child2 = Fabricate(:status, in_reply_to_id: child0.id)
+      context 'when status is direct' do
+        let(:status) { Fabricate(:status, account: account, visibility: :direct) }
 
-        get :show, params: { account_username: status.account.username, id: status.id }
+        context 'when user is authorized to see it' do
+          before do
+            Fabricate(:mention, account: user.account, status: status)
+            get :show, params: { account_username: status.account.username, id: status.id, format: format }
+          end
+
+          context 'as HTML' do
+            let(:format) { 'html' }
+
+            it 'returns http success' do
+              expect(response).to have_http_status(200)
+            end
+
+            it 'returns Link header' do
+              expect(response.headers['Link'].to_s).to include 'activity+json'
+            end
+
+            it 'returns Vary header' do
+              expect(response.headers['Vary']).to eq 'Accept'
+            end
+
+            it 'returns no Cache-Control header' do
+              expect(response.headers).to_not include 'Cache-Control'
+            end
+
+            it 'renders status' do
+              expect(response).to render_template(:show)
+              expect(response.body).to include status.text
+            end
+          end
+
+          context 'as JSON' do
+            let(:format) { 'json' }
+
+            it 'returns http success' do
+              expect(response).to have_http_status(200)
+            end
+
+            it 'returns Link header' do
+              expect(response.headers['Link'].to_s).to include 'activity+json'
+            end
+
+            it 'returns Vary header' do
+              expect(response.headers['Vary']).to eq 'Accept'
+            end
+
+            it 'returns private Cache-Control header' do
+              expect(response.headers['Cache-Control']).to include 'private'
+            end
+
+            it 'returns Content-Type header' do
+              expect(response.headers['Content-Type']).to include 'application/activity+json'
+            end
+
+            it 'renders ActivityPub Note object' do
+              json = body_as_json
+              expect(json[:content]).to include status.text
+            end
+          end
+        end
+
+        context 'when user is not authorized to see it' do
+          before do
+            get :show, params: { account_username: status.account.username, id: status.id, format: format }
+          end
+
+          context 'as JSON' do
+            let(:format) { 'json' }
 
-        expect(assigns(:descendant_threads)[0][:statuses].pluck(:id)).not_to include child1.id
-        expect(assigns(:descendant_threads)[1][:statuses].pluck(:id)).not_to include child2.id
-        expect(assigns(:descendant_threads)[0][:next_status].id).to eq child1.id
-        expect(assigns(:descendant_threads)[1][:next_status].id).to eq child2.id
+            it 'returns http not found' do
+              expect(response).to have_http_status(404)
+            end
+          end
+
+          context 'as HTML' do
+            let(:format) { 'html' }
+
+            it 'returns http not found' do
+              expect(response).to have_http_status(404)
+            end
+          end
+        end
       end
+    end
 
-      it 'returns a success' do
-        status = Fabricate(:status)
-        get :show, params: { account_username: status.account.username, id: status.id }
+    context 'with signature' do
+      let(:remote_account) { Fabricate(:account, domain: 'example.com') }
+
+      before do
+        allow(controller).to receive(:signed_request_account).and_return(remote_account)
+      end
+
+      context 'when account blocks account' do
+        before do
+          account.block!(remote_account)
+          get :show, params: { account_username: status.account.username, id: status.id }
+        end
+
+        it 'returns http not found' do
+          expect(response).to have_http_status(404)
+        end
+      end
+
+      context 'when account domain blocks account' do
+        before do
+          account.block_domain!(remote_account.domain)
+          get :show, params: { account_username: status.account.username, id: status.id }
+        end
+
+        it 'returns http not found' do
+          expect(response).to have_http_status(404)
+        end
+      end
+
+      context 'when status is public' do
+        before do
+          get :show, params: { account_username: status.account.username, id: status.id, format: format }
+        end
+
+        context 'as HTML' do
+          let(:format) { 'html' }
+
+          it 'returns http success' do
+            expect(response).to have_http_status(200)
+          end
+
+          it 'returns Link header' do
+            expect(response.headers['Link'].to_s).to include 'activity+json'
+          end
+
+          it 'returns Vary header' do
+            expect(response.headers['Vary']).to eq 'Accept'
+          end
+
+          it 'returns no Cache-Control header' do
+            expect(response.headers).to_not include 'Cache-Control'
+          end
+
+          it 'renders status' do
+            expect(response).to render_template(:show)
+            expect(response.body).to include status.text
+          end
+        end
+
+        context 'as JSON' do
+          let(:format) { 'json' }
+
+          it 'returns http success' do
+            expect(response).to have_http_status(200)
+          end
+
+          it 'returns Link header' do
+            expect(response.headers['Link'].to_s).to include 'activity+json'
+          end
+
+          it 'returns Vary header' do
+            expect(response.headers['Vary']).to eq 'Accept'
+          end
+
+          it 'returns public Cache-Control header' do
+            expect(response.headers['Cache-Control']).to include 'public'
+          end
+
+          it 'returns Content-Type header' do
+            expect(response.headers['Content-Type']).to include 'application/activity+json'
+          end
+
+          it 'renders ActivityPub Note object' do
+            json = body_as_json
+            expect(json[:content]).to include status.text
+          end
+        end
+      end
+
+      context 'when status is private' do
+        let(:status) { Fabricate(:status, account: account, visibility: :private) }
+
+        context 'when user is authorized to see it' do
+          before do
+            remote_account.follow!(account)
+            get :show, params: { account_username: status.account.username, id: status.id, format: format }
+          end
+
+          context 'as HTML' do
+            let(:format) { 'html' }
+
+            it 'returns http success' do
+              expect(response).to have_http_status(200)
+            end
+
+            it 'returns Link header' do
+              expect(response.headers['Link'].to_s).to include 'activity+json'
+            end
+
+            it 'returns Vary header' do
+              expect(response.headers['Vary']).to eq 'Accept'
+            end
+
+            it 'returns no Cache-Control header' do
+              expect(response.headers).to_not include 'Cache-Control'
+            end
+
+            it 'renders status' do
+              expect(response).to render_template(:show)
+              expect(response.body).to include status.text
+            end
+          end
+
+          context 'as JSON' do
+            let(:format) { 'json' }
+
+            it 'returns http success' do
+              expect(response).to have_http_status(200)
+            end
+
+            it 'returns Link header' do
+              expect(response.headers['Link'].to_s).to include 'activity+json'
+            end
+
+            it 'returns Vary header' do
+              expect(response.headers['Vary']).to eq 'Accept'
+            end
+
+            it 'returns private Cache-Control header' do
+              expect(response.headers['Cache-Control']).to include 'private'
+            end
+
+            it 'returns Content-Type header' do
+              expect(response.headers['Content-Type']).to include 'application/activity+json'
+            end
+
+            it 'renders ActivityPub Note object' do
+              json = body_as_json
+              expect(json[:content]).to include status.text
+            end
+          end
+        end
+
+        context 'when user is not authorized to see it' do
+          before do
+            get :show, params: { account_username: status.account.username, id: status.id, format: format }
+          end
+
+          context 'as JSON' do
+            let(:format) { 'json' }
+
+            it 'returns http not found' do
+              expect(response).to have_http_status(404)
+            end
+          end
+
+          context 'as HTML' do
+            let(:format) { 'html' }
+
+            it 'returns http not found' do
+              expect(response).to have_http_status(404)
+            end
+          end
+        end
+      end
+
+      context 'when status is direct' do
+        let(:status) { Fabricate(:status, account: account, visibility: :direct) }
+
+        context 'when user is authorized to see it' do
+          before do
+            Fabricate(:mention, account: remote_account, status: status)
+            get :show, params: { account_username: status.account.username, id: status.id, format: format }
+          end
+
+          context 'as HTML' do
+            let(:format) { 'html' }
+
+            it 'returns http success' do
+              expect(response).to have_http_status(200)
+            end
+
+            it 'returns Link header' do
+              expect(response.headers['Link'].to_s).to include 'activity+json'
+            end
+
+            it 'returns Vary header' do
+              expect(response.headers['Vary']).to eq 'Accept'
+            end
+
+            it 'returns no Cache-Control header' do
+              expect(response.headers).to_not include 'Cache-Control'
+            end
+
+            it 'renders status' do
+              expect(response).to render_template(:show)
+              expect(response.body).to include status.text
+            end
+          end
+
+          context 'as JSON' do
+            let(:format) { 'json' }
+
+            it 'returns http success' do
+              expect(response).to have_http_status(200)
+            end
+
+            it 'returns Link header' do
+              expect(response.headers['Link'].to_s).to include 'activity+json'
+            end
+
+            it 'returns Vary header' do
+              expect(response.headers['Vary']).to eq 'Accept'
+            end
+
+            it 'returns private Cache-Control header' do
+              expect(response.headers['Cache-Control']).to include 'private'
+            end
+
+            it 'returns Content-Type header' do
+              expect(response.headers['Content-Type']).to include 'application/activity+json'
+            end
+
+            it 'renders ActivityPub Note object' do
+              json = body_as_json
+              expect(json[:content]).to include status.text
+            end
+          end
+        end
+
+        context 'when user is not authorized to see it' do
+          before do
+            get :show, params: { account_username: status.account.username, id: status.id, format: format }
+          end
+
+          context 'as JSON' do
+            let(:format) { 'json' }
+
+            it 'returns http not found' do
+              expect(response).to have_http_status(404)
+            end
+          end
+
+          context 'as HTML' do
+            let(:format) { 'html' }
+
+            it 'returns http not found' do
+              expect(response).to have_http_status(404)
+            end
+          end
+        end
+      end
+    end
+  end
+
+  describe 'GET #activity' do
+    let(:account) { Fabricate(:account) }
+    let(:status)  { Fabricate(:status, account: account) }
+
+    context 'when account is suspended' do
+      let(:account) { Fabricate(:account, suspended: true) }
+
+      before do
+        get :activity, params: { account_username: account.username, id: status.id }
+      end
+
+      it 'returns http gone' do
+        expect(response).to have_http_status(410)
+      end
+    end
+
+    context 'when status is public' do
+      pending
+    end
+
+    context 'when status is private' do
+      pending
+    end
+
+    context 'when status is direct' do
+      pending
+    end
+
+    context 'when signed-in' do
+      context 'when status is public' do
+        pending
+      end
+
+      context 'when status is private' do
+        context 'when user is authorized to see it' do
+          pending
+        end
+
+        context 'when user is not authorized to see it' do
+          pending
+        end
+      end
+
+      context 'when status is direct' do
+        context 'when user is authorized to see it' do
+          pending
+        end
+
+        context 'when user is not authorized to see it' do
+          pending
+        end
+      end
+    end
+
+    context 'with signature' do
+      context 'when status is public' do
+        pending
+      end
+
+      context 'when status is private' do
+        context 'when user is authorized to see it' do
+          pending
+        end
+
+        context 'when user is not authorized to see it' do
+          pending
+        end
+      end
+
+      context 'when status is direct' do
+        context 'when user is authorized to see it' do
+          pending
+        end
+
+        context 'when user is not authorized to see it' do
+          pending
+        end
+      end
+    end
+  end
+
+  describe 'GET #embed' do
+    let(:account) { Fabricate(:account) }
+    let(:status)  { Fabricate(:status, account: account) }
+
+    context 'when account is suspended' do
+      let(:account) { Fabricate(:account, suspended: true) }
+
+      before do
+        get :embed, params: { account_username: account.username, id: status.id }
+      end
+
+      it 'returns http gone' do
+        expect(response).to have_http_status(410)
+      end
+    end
+
+    context 'when status is a reblog' do
+      let(:original_account) { Fabricate(:account, domain: 'example.com') }
+      let(:original_status) { Fabricate(:status, account: original_account, url: 'https://example.com/123') }
+      let(:status) { Fabricate(:status, account: account, reblog: original_status) }
+
+      before do
+        get :embed, params: { account_username: status.account.username, id: status.id }
+      end
+
+      it 'returns http not found' do
+        expect(response).to have_http_status(404)
+      end
+    end
+
+    context 'when status is public' do
+      before do
+        get :embed, params: { account_username: status.account.username, id: status.id }
+      end
+
+      it 'returns http success' do
         expect(response).to have_http_status(200)
       end
 
-      it 'renders statuses/show' do
-        status = Fabricate(:status)
-        get :show, params: { account_username: status.account.username, id: status.id }
-        expect(response).to render_template 'statuses/show'
+      it 'returns Link header' do
+        expect(response.headers['Link'].to_s).to include 'activity+json'
+      end
+
+      it 'returns Vary header' do
+        expect(response.headers['Vary']).to eq 'Accept'
+      end
+
+      it 'returns public Cache-Control header' do
+        expect(response.headers['Cache-Control']).to include 'public'
+      end
+
+      it 'renders status' do
+        expect(response).to render_template(:embed)
+        expect(response.body).to include status.text
+      end
+    end
+
+    context 'when status is private' do
+      let(:status) { Fabricate(:status, account: account, visibility: :private) }
+
+      before do
+        get :embed, params: { account_username: status.account.username, id: status.id }
+      end
+
+      it 'returns http not found' do
+        expect(response).to have_http_status(404)
+      end
+    end
+
+    context 'when status is direct' do
+      let(:status) { Fabricate(:status, account: account, visibility: :direct) }
+
+      before do
+        get :embed, params: { account_username: status.account.username, id: status.id }
+      end
+
+      it 'returns http not found' do
+        expect(response).to have_http_status(404)
       end
     end
   end
diff --git a/spec/fabricators/status_pin_fabricator.rb b/spec/fabricators/status_pin_fabricator.rb
index 6a9006c9f..f1f1c05f3 100644
--- a/spec/fabricators/status_pin_fabricator.rb
+++ b/spec/fabricators/status_pin_fabricator.rb
@@ -1,4 +1,4 @@
 Fabricator(:status_pin) do
   account
-  status
+  status { |attrs| Fabricate(:status, account: attrs[:account], visibility: :public) }
 end