Transmogrifier: Handle basic notice creation.

lib/pleroma/web/activity_pub/transmogrifier.ex

@@ -0,0 +1,44 @@
+defmodule Pleroma.Web.ActivityPub.Transmogrifier do
+  @moduledoc """
+  A module to handle coding from internal to wire ActivityPub and back.
+  """
+  alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.ActivityPub
+
+  @doc """
+  Modifies an incoming AP object (mastodon format) to our internal format.
+  """
+  def fix_object(object) do
+    object
+    |> Map.put("actor", object["attributedTo"])
+  end
+
+  # TODO: validate those with a Ecto scheme
+  # - tags
+  # - emoji
+  def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
+    with %User{} = user <- User.get_or_fetch_by_ap_id(data["actor"]) do
+      object = fix_object(data["object"])
+      params = %{
+        to: data["to"],
+        object: object,
+        actor: user,
+        context: data["object"]["conversation"],
+        local: false,
+        published: data["published"],
+        additional: Map.take(data, [
+              "cc",
+              "id"
+            ])
+      }
+
+      ActivityPub.create(params)
+    else
+      _e -> :error
+    end
+  end
+
+  def prepare_incoming(_) do
+    :error
+  end
+end