Improve federated ID validation (#8372)

* Fix URI not being sufficiently validated with prefetched JSON

* Add additional id validation to OStatus documents, when possible

spec/services/activitypub/fetch_remote_account_service_spec.rb

@@ -59,7 +59,6 @@ RSpec.describe ActivityPub::FetchRemoteAccountService, type: :service do
       it 'returns nil' do
         expect(account).to be_nil
       end
-
     end
 
     context 'when URI and WebFinger share the same host' do
@@ -119,5 +118,11 @@ RSpec.describe ActivityPub::FetchRemoteAccountService, type: :service do
 
       include_examples 'sets profile data'
     end
+
+    context 'with wrong id' do
+      it 'does not create account' do
+        expect(subject.call('https://fake.address/@foo', prefetched_body: Oj.dump(actor))).to be_nil
+      end
+    end
   end
 end

spec/services/activitypub/fetch_remote_status_service_spec.rb

@@ -70,5 +70,27 @@ RSpec.describe ActivityPub::FetchRemoteStatusService, type: :service do
         expect(strip_tags(status.text)).to eq "Nyan Cat 10 hours remix https://#{valid_domain}/watch?v=12345"
       end
     end
+
+    context 'with wrong id' do
+      let(:note) do
+        {
+          '@context': 'https://www.w3.org/ns/activitystreams',
+          id: "https://real.address/@foo/1234",
+          type: 'Note',
+          content: 'Lorem ipsum',
+          attributedTo: ActivityPub::TagManager.instance.uri_for(sender),
+        }
+      end
+
+      let(:object) do
+        temp = note.dup
+        temp[:id] = 'https://fake.address/@foo/5678'
+        temp
+      end
+
+      it 'does not create status' do
+        expect(sender.statuses.first).to be_nil
+      end
+    end
   end
 end