Add semi-support for Video/Image objects in ActivityPub (#5848)

* Add semi-support for Video/Image objects in ActivityPub

Video and Image objects will create corresponding status records
with manually crafted text contents (title + URL)

* Extract html-url-finding logic into JsonLdHelper

* Fallback to id when url missing, extract supported object types

spec/services/activitypub/fetch_remote_status_service_spec.rb

@@ -1,6 +1,8 @@
 require 'rails_helper'
 
 RSpec.describe ActivityPub::FetchRemoteStatusService do
+  include ActionView::Helpers::TextHelper
+
   let(:sender) { Fabricate(:account) }
   let(:recipient) { Fabricate(:account) }
   let(:valid_domain) { Rails.configuration.x.local_domain }
@@ -19,6 +21,7 @@ RSpec.describe ActivityPub::FetchRemoteStatusService do
 
   describe '#call' do
     before do
+      stub_request(:head, 'https://example.com/watch?v=12345').to_return(status: 404, body: '')
       subject.call(object[:id], prefetched_body: Oj.dump(object))
     end
 
@@ -32,5 +35,38 @@ RSpec.describe ActivityPub::FetchRemoteStatusService do
         expect(status.text).to eq 'Lorem ipsum'
       end
     end
+
+    context 'with Video object' do
+      let(:object) do
+        {
+          '@context': 'https://www.w3.org/ns/activitystreams',
+          id: "https://#{valid_domain}/@foo/1234",
+          type: 'Video',
+          name: 'Nyan Cat 10 hours remix',
+          attributedTo: ActivityPub::TagManager.instance.uri_for(sender),
+          url: [
+            {
+              type: 'Link',
+              mimeType: 'application/x-bittorrent',
+              href: 'https://example.com/12345.torrent',
+            },
+
+            {
+              type: 'Link',
+              mimeType: 'text/html',
+              href: 'https://example.com/watch?v=12345',
+            },
+          ],
+        }
+      end
+
+      it 'creates status' do
+        status = sender.statuses.first
+
+        expect(status).to_not be_nil
+        expect(status.url).to eq 'https://example.com/watch?v=12345'
+        expect(strip_tags(status.text)).to eq 'Nyan Cat 10 hours remix https://example.com/watch?v=12345'
+      end
+    end
   end
 end