Fix RSS feeds not being cachable (#14368)

* Add tests for some cachable responses

This only covers responses that we should have managed to make cachable
so far. It's not the case of all responses that should be cachable in
the end.

* Fix RSS feeds not being cachable

3 files changed, 51 insertions, 18 deletions

diff --git a/spec/controllers/activitypub/collections_controller_spec.rb b/spec/controllers/activitypub/collections_controller_spec.rb
index 56be49be3..89939d1d2 100644
--- a/spec/controllers/activitypub/collections_controller_spec.rb
+++ b/spec/controllers/activitypub/collections_controller_spec.rb
@@ -6,6 +6,21 @@ RSpec.describe ActivityPub::CollectionsController, type: :controller do
   let!(:account) { Fabricate(:account) }
   let(:remote_account) { nil }
 
+  shared_examples 'cachable response' do
+    it 'does not set cookies' do
+      expect(response.cookies).to be_empty
+      expect(response.headers['Set-Cookies']).to be nil
+    end
+
+    it 'does not set sessions' do
+      expect(session).to be_empty
+    end
+
+    it 'returns public Cache-Control header' do
+      expect(response.headers['Cache-Control']).to include 'public'
+    end
+  end
+
   before do
     allow(controller).to receive(:signed_request_account).and_return(remote_account)
 
@@ -31,9 +46,7 @@ RSpec.describe ActivityPub::CollectionsController, type: :controller 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_behaves_like 'cachable response'
 
         it 'returns orderedItems with pinned statuses' do
           json = body_as_json
@@ -58,9 +71,7 @@ RSpec.describe ActivityPub::CollectionsController, type: :controller 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_behaves_like 'cachable response'
 
           it 'returns orderedItems with pinned statuses' do
             json = body_as_json
diff --git a/spec/controllers/activitypub/outboxes_controller_spec.rb b/spec/controllers/activitypub/outboxes_controller_spec.rb
index 03490533d..1baf5a623 100644
--- a/spec/controllers/activitypub/outboxes_controller_spec.rb
+++ b/spec/controllers/activitypub/outboxes_controller_spec.rb
@@ -3,6 +3,21 @@ require 'rails_helper'
 RSpec.describe ActivityPub::OutboxesController, type: :controller do
   let!(:account) { Fabricate(:account) }
 
+  shared_examples 'cachable response' do
+    it 'does not set cookies' do
+      expect(response.cookies).to be_empty
+      expect(response.headers['Set-Cookies']).to be nil
+    end
+
+    it 'does not set sessions' do
+      expect(session).to be_empty
+    end
+
+    it 'returns public Cache-Control header' do
+      expect(response.headers['Cache-Control']).to include 'public'
+    end
+  end
+
   before do
     Fabricate(:status, account: account, visibility: :public)
     Fabricate(:status, account: account, visibility: :unlisted)
@@ -39,9 +54,7 @@ RSpec.describe ActivityPub::OutboxesController, type: :controller do
           expect(json[:totalItems]).to eq 4
         end
 
-        it 'returns public Cache-Control header' do
-          expect(response.headers['Cache-Control']).to include 'public'
-        end
+        it_behaves_like 'cachable response'
       end
 
       context 'with page requested' do
@@ -62,9 +75,7 @@ RSpec.describe ActivityPub::OutboxesController, type: :controller do
           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
+        it_behaves_like 'cachable response'
       end
     end
 
diff --git a/spec/controllers/activitypub/replies_controller_spec.rb b/spec/controllers/activitypub/replies_controller_spec.rb
index d956e1b35..ed383864d 100644
--- a/spec/controllers/activitypub/replies_controller_spec.rb
+++ b/spec/controllers/activitypub/replies_controller_spec.rb
@@ -7,6 +7,21 @@ RSpec.describe ActivityPub::RepliesController, type: :controller do
   let(:remote_reply_id) { nil }
   let(:remote_account) { nil }
 
+  shared_examples 'cachable response' do
+    it 'does not set cookies' do
+      expect(response.cookies).to be_empty
+      expect(response.headers['Set-Cookies']).to be nil
+    end
+
+    it 'does not set sessions' do
+      expect(session).to be_empty
+    end
+
+    it 'returns public Cache-Control header' do
+      expect(response.headers['Cache-Control']).to include 'public'
+    end
+  end
+
   before do
     allow(controller).to receive(:signed_request_account).and_return(remote_account)
 
@@ -36,9 +51,7 @@ RSpec.describe ActivityPub::RepliesController, type: :controller 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_behaves_like 'cachable response'
 
         it 'returns items with account\'s own replies' do
           json = body_as_json
@@ -87,9 +100,7 @@ RSpec.describe ActivityPub::RepliesController, type: :controller 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_behaves_like 'cachable response'
 
           context 'without only_other_accounts' do
             it 'returns items with account\'s own replies' do