Merge branch 'develop' into feature/database-compaction

lib/pleroma/object.ex

@@ -1,8 +1,21 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Object do
   use Ecto.Schema
-  alias Pleroma.{Repo, Object, Activity}
+
+  alias Pleroma.Activity
+  alias Pleroma.Object
   alias Pleroma.Object.Fetcher
-  import Ecto.{Query, Changeset}
+  alias Pleroma.ObjectTombstone
+  alias Pleroma.Repo
+  alias Pleroma.User
+
+  import Ecto.Query
+  import Ecto.Changeset
+
+  require Logger
 
   schema "objects" do
     field(:data, :map)
@@ -29,41 +42,149 @@ defmodule Pleroma.Object do
   end
 
   def normalize(_, fetch_remote \\ true)
+  # If we pass an Activity to Object.normalize(), we can try to use the preloaded object.
+  # Use this whenever possible, especially when walking graphs in an O(N) loop!
+  def normalize(%Activity{object: %Object{} = object}, _), do: object
 
-  def normalize(obj, fetch_remote) when is_map(obj), do: normalize(obj["id"], fetch_remote)
-  def normalize(ap_id, true) when is_binary(ap_id), do: Fetcher.fetch_object_from_id!(ap_id)
+  # A hack for fake activities
+  def normalize(%Activity{data: %{"object" => %{"fake" => true} = data}}, _) do
+    %Object{id: "pleroma:fake_object_id", data: data}
+  end
+
+  # Catch and log Object.normalize() calls where the Activity's child object is not
+  # preloaded.
+  def normalize(%Activity{data: %{"object" => %{"id" => ap_id}}}, fetch_remote) do
+    Logger.debug(
+      "Object.normalize() called without preloaded object (#{ap_id}).  Consider preloading the object!"
+    )
+
+    Logger.debug("Backtrace: #{inspect(Process.info(:erlang.self(), :current_stacktrace))}")
+
+    normalize(ap_id, fetch_remote)
+  end
+
+  def normalize(%Activity{data: %{"object" => ap_id}}, fetch_remote) do
+    Logger.debug(
+      "Object.normalize() called without preloaded object (#{ap_id}).  Consider preloading the object!"
+    )
+
+    Logger.debug("Backtrace: #{inspect(Process.info(:erlang.self(), :current_stacktrace))}")
+
+    normalize(ap_id, fetch_remote)
+  end
+
+  # Old way, try fetching the object through cache.
+  def normalize(%{"id" => ap_id}, fetch_remote), do: normalize(ap_id, fetch_remote)
   def normalize(ap_id, false) when is_binary(ap_id), do: get_cached_by_ap_id(ap_id)
-  def normalize(obj, _), do: nil
+  def normalize(ap_id, true) when is_binary(ap_id), do: Fetcher.fetch_object_from_id!(ap_id)
+  def normalize(_, _), do: nil
 
-  if Mix.env() == :test do
-    def get_cached_by_ap_id(ap_id) do
-      get_by_ap_id(ap_id)
-    end
-  else
-    def get_cached_by_ap_id(ap_id) do
-      key = "object:#{ap_id}"
+  # Owned objects can only be mutated by their owner
+  def authorize_mutation(%Object{data: %{"actor" => actor}}, %User{ap_id: ap_id}),
+    do: actor == ap_id
 
-      Cachex.fetch!(:object_cache, key, fn _ ->
-        object = get_by_ap_id(ap_id)
+  # Legacy objects can be mutated by anybody
+  def authorize_mutation(%Object{}, %User{}), do: true
 
-        if object do
-          {:commit, object}
-        else
-          {:ignore, object}
-        end
-      end)
-    end
+  def get_cached_by_ap_id(ap_id) do
+    key = "object:#{ap_id}"
+
+    Cachex.fetch!(:object_cache, key, fn _ ->
+      object = get_by_ap_id(ap_id)
+
+      if object do
+        {:commit, object}
+      else
+        {:ignore, object}
+      end
+    end)
   end
 
   def context_mapping(context) do
     Object.change(%Object{}, %{data: %{"id" => context}})
   end
 
+  def make_tombstone(%Object{data: %{"id" => id, "type" => type}}, deleted \\ DateTime.utc_now()) do
+    %ObjectTombstone{
+      id: id,
+      formerType: type,
+      deleted: deleted
+    }
+    |> Map.from_struct()
+  end
+
+  def swap_object_with_tombstone(object) do
+    tombstone = make_tombstone(object)
+
+    object
+    |> Object.change(%{data: tombstone})
+    |> Repo.update()
+  end
+
   def delete(%Object{data: %{"id" => id}} = object) do
-    with Repo.delete(object),
-         Repo.delete_all(Activity.all_non_create_by_object_ap_id_q(id)),
+    with {:ok, _obj} = swap_object_with_tombstone(object),
+         deleted_activity = Activity.delete_by_ap_id(id),
          {:ok, true} <- Cachex.del(:object_cache, "object:#{id}") do
-      {:ok, object}
+      {:ok, object, deleted_activity}
+    end
+  end
+
+  def set_cache(%Object{data: %{"id" => ap_id}} = object) do
+    Cachex.put(:object_cache, "object:#{ap_id}", object)
+    {:ok, object}
+  end
+
+  def update_and_set_cache(changeset) do
+    with {:ok, object} <- Repo.update(changeset) do
+      set_cache(object)
+    else
+      e -> e
+    end
+  end
+
+  def increase_replies_count(ap_id) do
+    Object
+    |> where([o], fragment("?->>'id' = ?::text", o.data, ^to_string(ap_id)))
+    |> update([o],
+      set: [
+        data:
+          fragment(
+            """
+            jsonb_set(?, '{repliesCount}',
+              (coalesce((?->>'repliesCount')::int, 0) + 1)::varchar::jsonb, true)
+            """,
+            o.data,
+            o.data
+          )
+      ]
+    )
+    |> Repo.update_all([])
+    |> case do
+      {1, [object]} -> set_cache(object)
+      _ -> {:error, "Not found"}
+    end
+  end
+
+  def decrease_replies_count(ap_id) do
+    Object
+    |> where([o], fragment("?->>'id' = ?::text", o.data, ^to_string(ap_id)))
+    |> update([o],
+      set: [
+        data:
+          fragment(
+            """
+            jsonb_set(?, '{repliesCount}',
+              (greatest(0, (?->>'repliesCount')::int - 1))::varchar::jsonb, true)
+            """,
+            o.data,
+            o.data
+          )
+      ]
+    )
+    |> Repo.update_all([])
+    |> case do
+      {1, [object]} -> set_cache(object)
+      _ -> {:error, "Not found"}
     end
   end
 end