Generates contexts and ids on insertion time.

lib/pleroma/web/activity_pub/utils.ex

@@ -45,6 +45,18 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     "#{Web.base_url()}/#{type}/#{UUID.generate()}"
   end
 
+  def create_context(context) do
+    context = context || generate_id("contexts")
+    changeset = Object.context_mapping(context)
+
+    case Repo.insert(changeset) do
+      {:ok, object} -> object
+      # This should be solved by an upsert, but it seems ecto
+      # has problems accessing the constraint inside the jsonb.
+      {:error, _} -> Object.get_cached_by_ap_id(context)
+    end
+  end
+
   @doc """
   Enqueues an activity for federation if it's local
   """
@@ -67,13 +79,17 @@ defmodule Pleroma.Web.ActivityPub.Utils do
   also adds it to an included object
   """
   def lazy_put_activity_defaults(map) do
+    %{data: %{"id" => context}, id: context_id} = create_context(map["context"])
+
     map =
       map
       |> Map.put_new_lazy("id", &generate_activity_id/0)
       |> Map.put_new_lazy("published", &make_date/0)
+      |> Map.put_new("context", context)
+      |> Map.put_new("context_id", context_id)
 
     if is_map(map["object"]) do
-      object = lazy_put_object_defaults(map["object"])
+      object = lazy_put_object_defaults(map["object"], map)
       %{map | "object" => object}
     else
       map
@@ -83,10 +99,12 @@ defmodule Pleroma.Web.ActivityPub.Utils do
   @doc """
   Adds an id and published date if they aren't there.
   """
-  def lazy_put_object_defaults(map) do
+  def lazy_put_object_defaults(map, activity \\ %{}) do
     map
     |> Map.put_new_lazy("id", &generate_object_id/0)
     |> Map.put_new_lazy("published", &make_date/0)
+    |> Map.put_new("context", activity["context"])
+    |> Map.put_new("context_id", activity["context_id"])
   end
 
   @doc """

lib/pleroma/web/twitter_api/views/activity_view.ex

@@ -32,13 +32,14 @@ defmodule Pleroma.Web.TwitterAPI.ActivityView do
     end)
   end
 
-  defp get_context_id(%{data: %{"context" => nil}}), do: nil
+  defp get_context_id(%{data: %{"context" => nil}}, _), do: nil
   defp get_context_id(%{data: %{"context" => context}}, options) do
     cond do
       id = options[:context_ids][context] -> id
       true -> TwitterAPI.context_to_conversation_id(context)
     end
   end
+  defp get_context_id(_, _), do: nil
 
   def render("index.json", opts) do
     context_ids = collect_context_ids(opts.activities)

test/web/activity_pub/activity_pub_test.exs

@@ -40,12 +40,31 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubTest do
 
       data = %{
         "ok" => true,
-        "id" => given_id
+        "id" => given_id,
+        "context" => "blabla"
       }
 
       {:ok, %Activity{} = activity} = ActivityPub.insert(data)
       assert activity.data["ok"] == data["ok"]
       assert activity.data["id"] == given_id
+      assert activity.data["context"] == "blabla"
+      assert activity.data["context_id"]
+    end
+
+    test "adds a context when none is there" do
+      data = %{
+        "id" => "some_id",
+        "object" => %{
+          "id" => "object_id"
+         }
+      }
+
+      {:ok, %Activity{} = activity} = ActivityPub.insert(data)
+
+      assert is_binary(activity.data["context"])
+      assert is_binary(activity.data["object"]["context"])
+      assert activity.data["context_id"]
+      assert activity.data["object"]["context_id"]
     end
 
     test "adds an id to a given object if it lacks one and is a note and inserts it to the object database" do