Accept remote quotes of local quotes according to set policy (#35629)

spec/lib/activitypub/activity/quote_request_spec.rb

@@ -2,7 +2,7 @@
 
 require 'rails_helper'
 
-RSpec.describe ActivityPub::Activity::QuoteRequest do
+RSpec.describe ActivityPub::Activity::QuoteRequest, feature: :outgoing_quotes do
   let(:sender)    { Fabricate(:account, domain: 'example.com') }
   let(:recipient) { Fabricate(:account) }
   let(:quoted_post) { Fabricate(:status, account: recipient) }
@@ -47,5 +47,44 @@ RSpec.describe ActivityPub::Activity::QuoteRequest do
           end, recipient.id, sender.inbox_url)
       end
     end
+
+    context 'when trying to quote a quotable local status' do
+      let(:status_json) do
+        {
+          '@context': [
+            'https://www.w3.org/ns/activitystreams',
+            {
+              '@id': 'https://w3id.org/fep/044f#quote',
+              '@type': '@id',
+            },
+            {
+              '@id': 'https://w3id.org/fep/044f#quoteAuthorization',
+              '@type': '@id',
+            },
+          ],
+          id: 'https://example.com/unknown-status',
+          type: 'Note',
+          summary: 'Show more',
+          content: 'Hello universe',
+          quote: ActivityPub::TagManager.instance.uri_for(quoted_post),
+          attributedTo: ActivityPub::TagManager.instance.uri_for(sender),
+        }.deep_stringify_keys
+      end
+
+      before do
+        stub_request(:get, 'https://example.com/unknown-status').to_return(status: 200, body: Oj.dump(status_json), headers: { 'Content-Type': 'application/activity+json' })
+        quoted_post.update(quote_approval_policy: Status::QUOTE_APPROVAL_POLICY_FLAGS[:public] << 16)
+      end
+
+      it 'accepts the quote and sends an Accept activity' do
+        expect { subject.perform }
+          .to change { quoted_post.reload.quotes.accepted.count }.by(1)
+          .and enqueue_sidekiq_job(ActivityPub::DeliveryWorker)
+          .with(satisfying do |body|
+            outgoing_json = Oj.load(body)
+            outgoing_json['type'] == 'Accept' && %w(type id actor object instrument).all? { |key| json[key] == outgoing_json['object'][key] }
+          end, recipient.id, sender.inbox_url)
+      end
+    end
   end
 end