Add E2EE API (#13820)

app/serializers/activitypub/device_serializer.rb

@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+class ActivityPub::DeviceSerializer < ActivityPub::Serializer
+  context_extensions :olm
+
+  include RoutingHelper
+
+  class FingerprintKeySerializer < ActivityPub::Serializer
+    attributes :type, :public_key_base64
+
+    def type
+      'Ed25519Key'
+    end
+
+    def public_key_base64
+      object.fingerprint_key
+    end
+  end
+
+  class IdentityKeySerializer < ActivityPub::Serializer
+    attributes :type, :public_key_base64
+
+    def type
+      'Curve25519Key'
+    end
+
+    def public_key_base64
+      object.identity_key
+    end
+  end
+
+  attributes :device_id, :type, :name, :claim
+
+  has_one :fingerprint_key, serializer: FingerprintKeySerializer
+  has_one :identity_key, serializer: IdentityKeySerializer
+
+  def type
+    'Device'
+  end
+
+  def claim
+    account_claim_url(object.account, id: object.device_id)
+  end
+
+  def fingerprint_key
+    object
+  end
+
+  def identity_key
+    object
+  end
+end