Let pins federate

- save object ids on pin, instead of activity ids
- pins federation
- removed pinned_activities field from the users table
- activityPub endpoint for user pins
- pulling remote users pins

test/pleroma/user_test.exs

@@ -2338,4 +2338,49 @@ defmodule Pleroma.UserTest do
     assert User.active_user_count(6) == 3
     assert User.active_user_count(1) == 1
   end
+
+  describe "pins" do
+    setup do
+      user = insert(:user)
+
+      [user: user, object_id: object_id_from_created_activity(user)]
+    end
+
+    test "unique pins", %{user: user, object_id: object_id} do
+      assert {:ok, %{pinned_objects: %{^object_id => pinned_at1} = pins} = updated_user} =
+               User.add_pinned_object_id(user, object_id)
+
+      assert Enum.count(pins) == 1
+
+      assert {:ok, %{pinned_objects: %{^object_id => pinned_at2} = pins}} =
+               User.add_pinned_object_id(updated_user, object_id)
+
+      assert pinned_at1 == pinned_at2
+
+      assert Enum.count(pins) == 1
+    end
+
+    test "respects max_pinned_statuses limit", %{user: user, object_id: object_id} do
+      clear_config([:instance, :max_pinned_statuses], 1)
+      {:ok, updated} = User.add_pinned_object_id(user, object_id)
+
+      object_id2 = object_id_from_created_activity(user)
+
+      {:error, %{errors: errors}} = User.add_pinned_object_id(updated, object_id2)
+      assert Keyword.has_key?(errors, :pinned_objects)
+    end
+
+    test "remove_pinned_object_id/2", %{user: user, object_id: object_id} do
+      assert {:ok, updated} = User.add_pinned_object_id(user, object_id)
+
+      {:ok, after_remove} = User.remove_pinned_object_id(updated, object_id)
+      assert after_remove.pinned_objects == %{}
+    end
+  end
+
+  defp object_id_from_created_activity(user) do
+    %{id: id} = insert(:note_activity, user: user)
+    %{object: %{data: %{"id" => object_id}}} = Activity.get_by_id_with_object(id)
+    object_id
+  end
 end