Remove unused ActivityPub `@context` values depending on response (#10378)

Fix #8078

1 files changed, 88 insertions, 0 deletions

diff --git a/spec/lib/activitypub/adapter_spec.rb b/spec/lib/activitypub/adapter_spec.rb
new file mode 100644
index 000000000..ea03797aa
--- /dev/null
+++ b/spec/lib/activitypub/adapter_spec.rb
@@ -0,0 +1,88 @@
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Adapter do
+  class TestObject < ActiveModelSerializers::Model
+    attributes :foo
+  end
+
+  class TestWithBasicContextSerializer < ActivityPub::Serializer
+    attributes :foo
+  end
+
+  class TestWithNamedContextSerializer < ActivityPub::Serializer
+    context :security
+    attributes :foo
+  end
+
+  class TestWithNestedNamedContextSerializer < ActivityPub::Serializer
+    attributes :foo
+
+    has_one :virtual_object, key: :baz, serializer: TestWithNamedContextSerializer
+
+    def virtual_object
+      object
+    end
+  end
+
+  class TestWithContextExtensionSerializer < ActivityPub::Serializer
+    context_extensions :sensitive
+    attributes :foo
+  end
+
+  class TestWithNestedContextExtensionSerializer < ActivityPub::Serializer
+    context_extensions :manually_approves_followers
+    attributes :foo
+
+    has_one :virtual_object, key: :baz, serializer: TestWithContextExtensionSerializer
+
+    def virtual_object
+      object
+    end
+  end
+
+  describe '#serializable_hash' do
+    let(:serializer_class) {}
+
+    subject { ActiveModelSerializers::SerializableResource.new(TestObject.new(foo: 'bar'), serializer: serializer_class, adapter: described_class).as_json }
+
+    context 'when serializer defines no context' do
+      let(:serializer_class) { TestWithBasicContextSerializer }
+
+      it 'renders a basic @context' do
+        expect(subject).to include({ '@context' => 'https://www.w3.org/ns/activitystreams' })
+      end
+    end
+
+    context 'when serializer defines a named context' do
+      let(:serializer_class) { TestWithNamedContextSerializer }
+
+      it 'renders a @context with both items' do
+        expect(subject).to include({ '@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1'] })
+      end
+    end
+
+    context 'when serializer has children that define a named context' do
+      let(:serializer_class) { TestWithNestedNamedContextSerializer }
+
+      it 'renders a @context with both items' do
+        expect(subject).to include({ '@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1'] })
+      end
+    end
+
+    context 'when serializer defines context extensions' do
+      let(:serializer_class) { TestWithContextExtensionSerializer }
+
+      it 'renders a @context with the extension' do
+        expect(subject).to include({ '@context' => ['https://www.w3.org/ns/activitystreams', { 'sensitive' => 'as:sensitive' }] })
+      end
+    end
+
+    context 'when serializer has children that define context extensions' do
+      let(:serializer_class) { TestWithNestedContextExtensionSerializer }
+
+      it 'renders a @context with both extensions' do
+        expect(subject).to include({ '@context' => ['https://www.w3.org/ns/activitystreams', { 'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers', 'sensitive' => 'as:sensitive' }] })
+      end
+    end
+  end
+end