ActivityPub delivery (#4566)

* Deliver ActivityPub Like

* Deliver ActivityPub Undo-Like

* Deliver ActivityPub Create/Announce activities

* Deliver ActivityPub creates from mentions

* Deliver ActivityPub Block/Undo-Block

* Deliver ActivityPub Accept/Reject-Follow

* Deliver ActivityPub Undo-Follow

* Deliver ActivityPub Follow

* Deliver ActivityPub Delete activities

Incidentally fix #889

* Adjust BatchedRemoveStatusService for ActivityPub

* Add tests for ActivityPub workers

* Add tests for FollowService

* Add tests for FavouriteService, UnfollowService and PostStatusService

* Add tests for ReblogService, BlockService, UnblockService, ProcessMentionsService

* Add tests for AuthorizeFollowService, RejectFollowService, RemoveStatusService

* Add tests for BatchedRemoveStatusService

* Deliver updates to a local account to ActivityPub followers

* Minor adjustments

spec/services/resolve_remote_account_service_spec.rb

@@ -1,7 +1,7 @@
 require 'rails_helper'
 
 RSpec.describe ResolveRemoteAccountService do
-  subject { ResolveRemoteAccountService.new }
+  subject { described_class.new }
 
   before do
     stub_request(:get, "https://quitter.no/.well-known/host-meta").to_return(request_fixture('.host-meta.txt'))
@@ -29,29 +29,6 @@ RSpec.describe ResolveRemoteAccountService do
     expect(subject.call('catsrgr8@example.com')).to be_nil
   end
 
-  it 'returns an already existing remote account' do
-    old_account      = Fabricate(:account, username: 'gargron', domain: 'quitter.no')
-    returned_account = subject.call('gargron@quitter.no')
-
-    expect(old_account.id).to eq returned_account.id
-  end
-
-  it 'returns a new remote account' do
-    account = subject.call('gargron@quitter.no')
-
-    expect(account.username).to eq 'gargron'
-    expect(account.domain).to eq 'quitter.no'
-    expect(account.remote_url).to eq 'https://quitter.no/api/statuses/user_timeline/7477.atom'
-  end
-
-  it 'follows a legitimate account redirection' do
-    account = subject.call('gargron@redirected.com')
-
-    expect(account.username).to eq 'gargron'
-    expect(account.domain).to eq 'quitter.no'
-    expect(account.remote_url).to eq 'https://quitter.no/api/statuses/user_timeline/7477.atom'
-  end
-
   it 'prevents hijacking existing accounts' do
     account = subject.call('hacker1@redirected.com')
     expect(account.salmon_url).to_not eq 'https://hacker.com/main/salmon/user/7477'
@@ -61,12 +38,41 @@ RSpec.describe ResolveRemoteAccountService do
     expect(subject.call('hacker2@redirected.com')).to be_nil
   end
 
-  it 'returns a new remote account' do
-    account = subject.call('foo@localdomain.com')
+  context 'with an OStatus account' do
+    it 'returns an already existing remote account' do
+      old_account      = Fabricate(:account, username: 'gargron', domain: 'quitter.no')
+      returned_account = subject.call('gargron@quitter.no')
 
-    expect(account.username).to eq 'foo'
-    expect(account.domain).to eq 'localdomain.com'
-    expect(account.remote_url).to eq 'https://webdomain.com/users/foo.atom'
+      expect(old_account.id).to eq returned_account.id
+    end
+
+    it 'returns a new remote account' do
+      account = subject.call('gargron@quitter.no')
+
+      expect(account.username).to eq 'gargron'
+      expect(account.domain).to eq 'quitter.no'
+      expect(account.remote_url).to eq 'https://quitter.no/api/statuses/user_timeline/7477.atom'
+    end
+
+    it 'follows a legitimate account redirection' do
+      account = subject.call('gargron@redirected.com')
+
+      expect(account.username).to eq 'gargron'
+      expect(account.domain).to eq 'quitter.no'
+      expect(account.remote_url).to eq 'https://quitter.no/api/statuses/user_timeline/7477.atom'
+    end
+
+    it 'returns a new remote account' do
+      account = subject.call('foo@localdomain.com')
+
+      expect(account.username).to eq 'foo'
+      expect(account.domain).to eq 'localdomain.com'
+      expect(account.remote_url).to eq 'https://webdomain.com/users/foo.atom'
+    end
+  end
+
+  context 'with an ActivityPub account' do
+    pending
   end
 
   it 'processes one remote account at a time using locks' do
@@ -78,7 +84,7 @@ RSpec.describe ResolveRemoteAccountService do
       Thread.new do
         true while wait_for_start
         begin
-          return_values << ResolveRemoteAccountService.new.call('foo@localdomain.com')
+          return_values << described_class.new.call('foo@localdomain.com')
         rescue ActiveRecord::RecordNotUnique
           fail_occurred = true
         end