ObjectValidators.{Announce,EmojiReact,Like}: Fix context, actor & addressing

lib/pleroma/web/activity_pub/object_validators/announce_validator.ex

@@ -8,6 +8,7 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.AnnounceValidator do
   alias Pleroma.EctoType.ActivityPub.ObjectValidators
   alias Pleroma.Object
   alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes
   alias Pleroma.Web.ActivityPub.Utils
   alias Pleroma.Web.ActivityPub.Visibility
 
@@ -23,7 +24,7 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.AnnounceValidator do
     field(:type, :string)
     field(:object, ObjectValidators.ObjectID)
     field(:actor, ObjectValidators.ObjectID)
-    field(:context, :string, autogenerate: {Utils, :generate_context_id, []})
+    field(:context, :string)
     field(:to, ObjectValidators.Recipients, default: [])
     field(:cc, ObjectValidators.Recipients, default: [])
     field(:published, ObjectValidators.DateTime)
@@ -36,6 +37,10 @@ def cast_and_validate(data) do
   end
 
   def cast_data(data) do
+    data =
+      data
+      |> fix()
+
     %__MODULE__{}
     |> changeset(data)
   end
@@ -43,11 +48,21 @@ def cast_data(data) do
   def changeset(struct, data) do
     struct
     |> cast(data, __schema__(:fields))
-    |> fix_after_cast()
   end
 
-  def fix_after_cast(cng) do
-    cng
+  defp fix(data) do
+    data =
+      data
+      |> CommonFixes.fix_actor()
+      |> CommonFixes.fix_activity_addressing()
+
+    with %Object{} = object <- Object.normalize(data["object"]) do
+      data
+      |> CommonFixes.fix_activity_context(object)
+      |> CommonFixes.fix_object_action_recipients(object)
+    else
+      _ -> data
+    end
   end
 
   defp validate_data(data_cng) do
@@ -60,7 +75,7 @@ defp validate_data(data_cng) do
     |> validate_announcable()
   end
 
-  def validate_announcable(cng) do
+  defp validate_announcable(cng) do
     with actor when is_binary(actor) <- get_field(cng, :actor),
          object when is_binary(object) <- get_field(cng, :object),
          %User{} = actor <- User.get_cached_by_ap_id(actor),
@@ -91,7 +106,7 @@ def validate_announcable(cng) do
     end
   end
 
-  def validate_existing_announce(cng) do
+  defp validate_existing_announce(cng) do
     actor = get_field(cng, :actor)
     object = get_field(cng, :object)
 

lib/pleroma/web/activity_pub/object_validators/common_fixes.ex

@@ -4,6 +4,7 @@
 
 defmodule Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes do
   alias Pleroma.EctoType.ActivityPub.ObjectValidators
+  alias Pleroma.Object
   alias Pleroma.Object.Containment
   alias Pleroma.User
   alias Pleroma.Web.ActivityPub.Transmogrifier
@@ -36,7 +37,7 @@ def fix_object_defaults(data) do
     |> Transmogrifier.fix_implicit_addressing(follower_collection)
   end
 
-  def fix_activity_addressing(activity, _meta) do
+  def fix_activity_addressing(activity) do
     %User{follower_address: follower_collection} = User.get_cached_by_ap_id(activity["actor"])
 
     activity
@@ -57,4 +58,21 @@ def fix_actor(data) do
     |> Map.put("actor", actor)
     |> Map.put("attributedTo", actor)
   end
+
+  def fix_activity_context(data, %Object{data: %{"context" => object_context}}) do
+    data
+    |> Map.put("context", object_context)
+  end
+
+  def fix_object_action_recipients(%{"actor" => actor} = data, %Object{data: %{"actor" => actor}}) do
+    to = ((data["to"] || []) -- [actor]) |> Enum.uniq()
+
+    Map.put(data, "to", to)
+  end
+
+  def fix_object_action_recipients(data, %Object{data: %{"actor" => actor}}) do
+    to = ((data["to"] || []) ++ [actor]) |> Enum.uniq()
+
+    Map.put(data, "to", to)
+  end
 end

lib/pleroma/web/activity_pub/object_validators/emoji_react_validator.ex

@@ -7,6 +7,7 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.EmojiReactValidator do
 
   alias Pleroma.EctoType.ActivityPub.ObjectValidators
   alias Pleroma.Object
+  alias Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes
 
   import Ecto.Changeset
   import Pleroma.Web.ActivityPub.ObjectValidators.CommonValidations
@@ -31,6 +32,10 @@ def cast_and_validate(data) do
   end
 
   def cast_data(data) do
+    data =
+      data
+      |> fix()
+
     %__MODULE__{}
     |> changeset(data)
   end
@@ -38,28 +43,24 @@ def cast_data(data) do
   def changeset(struct, data) do
     struct
     |> cast(data, __schema__(:fields))
-    |> fix_after_cast()
   end
 
-  def fix_after_cast(cng) do
-    cng
-    |> fix_context()
-  end
+  defp fix(data) do
+    data =
+      data
+      |> CommonFixes.fix_actor()
+      |> CommonFixes.fix_activity_addressing()
 
-  def fix_context(cng) do
-    object = get_field(cng, :object)
-
-    with nil <- get_field(cng, :context),
-         %Object{data: %{"context" => context}} <- Object.get_cached_by_ap_id(object) do
-      cng
-      |> put_change(:context, context)
+    with %Object{} = object <- Object.normalize(data["object"]) do
+      data
+      |> CommonFixes.fix_activity_context(object)
+      |> CommonFixes.fix_object_action_recipients(object)
     else
-      _ ->
-        cng
+      _ -> data
     end
   end
 
-  def validate_emoji(cng) do
+  defp validate_emoji(cng) do
     content = get_field(cng, :content)
 
     if Pleroma.Emoji.is_unicode_emoji?(content) do

lib/pleroma/web/activity_pub/object_validators/like_validator.ex

@@ -7,6 +7,7 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator do
 
   alias Pleroma.EctoType.ActivityPub.ObjectValidators
   alias Pleroma.Object
+  alias Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes
   alias Pleroma.Web.ActivityPub.Utils
 
   import Ecto.Changeset
@@ -31,6 +32,10 @@ def cast_and_validate(data) do
   end
 
   def cast_data(data) do
+    data =
+      data
+      |> fix()
+
     %__MODULE__{}
     |> changeset(data)
   end
@@ -38,41 +43,20 @@ def cast_data(data) do
   def changeset(struct, data) do
     struct
     |> cast(data, __schema__(:fields))
-    |> fix_after_cast()
   end
 
-  def fix_after_cast(cng) do
-    cng
-    |> fix_recipients()
-    |> fix_context()
-  end
+  defp fix(data) do
+    data =
+      data
+      |> CommonFixes.fix_actor()
+      |> CommonFixes.fix_activity_addressing()
 
-  def fix_context(cng) do
-    object = get_field(cng, :object)
-
-    with nil <- get_field(cng, :context),
-         %Object{data: %{"context" => context}} <- Object.get_cached_by_ap_id(object) do
-      cng
-      |> put_change(:context, context)
+    with %Object{} = object <- Object.normalize(data["object"]) do
+      data
+      |> CommonFixes.fix_activity_context(object)
+      |> CommonFixes.fix_object_action_recipients(object)
     else
-      _ ->
-        cng
-    end
-  end
-
-  def fix_recipients(cng) do
-    to = get_field(cng, :to)
-    cc = get_field(cng, :cc)
-    object = get_field(cng, :object)
-
-    with {[], []} <- {to, cc},
-         %Object{data: %{"actor" => actor}} <- Object.get_cached_by_ap_id(object),
-         {:ok, actor} <- ObjectValidators.ObjectID.cast(actor) do
-      cng
-      |> put_change(:to, [actor])
-    else
-      _ ->
-        cng
+      _ -> data
     end
   end
 
@@ -85,7 +69,7 @@ defp validate_data(data_cng) do
     |> validate_existing_like()
   end
 
-  def validate_existing_like(%{changes: %{actor: actor, object: object}} = cng) do
+  defp validate_existing_like(%{changes: %{actor: actor, object: object}} = cng) do
     if Utils.get_existing_like(actor, %{data: %{"id" => object}}) do
       cng
       |> add_error(:actor, "already liked this object")
@@ -95,5 +79,5 @@ def validate_existing_like(%{changes: %{actor: actor, object: object}} = cng) do
     end
   end
 
-  def validate_existing_like(cng), do: cng
+  defp validate_existing_like(cng), do: cng
 end

test/pleroma/web/activity_pub/object_validators/announce_validation_test.exs

@@ -33,6 +33,18 @@ test "returns ok for a valid announce", %{valid_announce: valid_announce} do
       assert {:ok, _object, _meta} = ObjectValidator.validate(valid_announce, [])
     end
 
+    test "keeps announced object context", %{valid_announce: valid_announce} do
+      assert %Object{data: %{"context" => object_context}} =
+               Object.get_cached_by_ap_id(valid_announce["object"])
+
+      {:ok, %{"context" => context}, _} =
+        valid_announce
+        |> Map.put("context", "https://example.org/invalid_context_id")
+        |> ObjectValidator.validate([])
+
+      assert context == object_context
+    end
+
     test "returns an error if the object can't be found", %{valid_announce: valid_announce} do
       without_object =
         valid_announce
@@ -51,16 +63,6 @@ test "returns an error if the object can't be found", %{valid_announce: valid_an
       assert {:object, {"can't find object", []}} in cng.errors
     end
 
-    test "returns an error if we don't have the actor", %{valid_announce: valid_announce} do
-      nonexisting_actor =
-        valid_announce
-        |> Map.put("actor", "https://gensokyo.2hu/users/raymoo")
-
-      {:error, cng} = ObjectValidator.validate(nonexisting_actor, [])
-
-      assert {:actor, {"can't find user", []}} in cng.errors
-    end
-
     test "returns an error if the actor already announced the object", %{
       valid_announce: valid_announce,
       announcer: announcer,

test/pleroma/web/activity_pub/object_validators/like_validation_test.exs

@@ -40,17 +40,30 @@ test "is valid for a valid object", %{valid_like: valid_like} do
       assert LikeValidator.cast_and_validate(valid_like).valid?
     end
 
-    test "sets the 'to' field to the object actor if no recipients are given", %{
+    test "Add object actor from 'to' field if it doesn't owns the like", %{valid_like: valid_like} do
+      user = insert(:user)
+
+      object_actor = valid_like["actor"]
+
+      valid_like =
+        valid_like
+        |> Map.put("actor", user.ap_id)
+        |> Map.put("to", [])
+
+      {:ok, object, _meta} = ObjectValidator.validate(valid_like, [])
+      assert object_actor in object["to"]
+    end
+
+    test "Removes object actor from 'to' field if it owns the like", %{
       valid_like: valid_like,
       user: user
     } do
-      without_recipients =
+      valid_like =
         valid_like
-        |> Map.delete("to")
+        |> Map.put("to", [user.ap_id])
 
-      {:ok, object, _meta} = ObjectValidator.validate(without_recipients, [])
-
-      assert object["to"] == [user.ap_id]
+      {:ok, object, _meta} = ObjectValidator.validate(valid_like, [])
+      refute user.ap_id in object["to"]
     end
 
     test "sets the context field to the context of the object if no context is given", %{
@@ -66,16 +79,6 @@ test "sets the context field to the context of the object if no context is given
       assert object["context"] == post_activity.data["context"]
     end
 
-    test "it errors when the actor is missing or not known", %{valid_like: valid_like} do
-      without_actor = Map.delete(valid_like, "actor")
-
-      refute LikeValidator.cast_and_validate(without_actor).valid?
-
-      with_invalid_actor = Map.put(valid_like, "actor", "invalidactor")
-
-      refute LikeValidator.cast_and_validate(with_invalid_actor).valid?
-    end
-
     test "it errors when the object is missing or not known", %{valid_like: valid_like} do
       without_object = Map.delete(valid_like, "object")
 

test/pleroma/web/activity_pub/relay_test.exs

@@ -148,7 +148,7 @@ test "returns error when object is unknown" do
       assert {:ok, %Activity{} = activity} = Relay.publish(note)
       assert activity.data["type"] == "Announce"
       assert activity.data["actor"] == service_actor.ap_id
-      assert activity.data["to"] == [service_actor.follower_address]
+      assert service_actor.follower_address in activity.data["to"]
       assert called(Pleroma.Web.Federator.publish(activity))
     end
 

test/pleroma/web/activity_pub/transmogrifier/announce_handling_test.exs

@@ -150,27 +150,4 @@ test "it rejects incoming announces with an inlined activity from another origin
 
     assert {:error, _e} = Transmogrifier.handle_incoming(data)
   end
-
-  test "it does not clobber the addressing on announce activities" do
-    user = insert(:user)
-    {:ok, activity} = CommonAPI.post(user, %{status: "hey"})
-
-    data =
-      File.read!("test/fixtures/mastodon-announce.json")
-      |> Jason.decode!()
-      |> Map.put("object", Object.normalize(activity, fetch: false).data["id"])
-      |> Map.put("to", ["http://mastodon.example.org/users/admin/followers"])
-      |> Map.put("cc", [])
-
-    _user =
-      insert(:user,
-        local: false,
-        ap_id: data["actor"],
-        follower_address: "http://mastodon.example.org/users/admin/followers"
-      )
-
-    {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
-
-    assert data["to"] == ["http://mastodon.example.org/users/admin/followers"]
-  end
 end