Pleroma/lib/pleroma/object.ex

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# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Object do
use Ecto.Schema
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alias Pleroma.Activity
alias Pleroma.Object
alias Pleroma.Object.Fetcher
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alias Pleroma.ObjectTombstone
alias Pleroma.Repo
alias Pleroma.User
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import Ecto.Query
import Ecto.Changeset
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require Logger
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schema "objects" do
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field(:data, :map)
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timestamps()
end
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def create(data) do
Object.change(%Object{}, %{data: data})
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|> Repo.insert()
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end
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def change(struct, params \\ %{}) do
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struct
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|> cast(params, [:data])
|> validate_required([:data])
|> unique_constraint(:ap_id, name: :objects_unique_apid_index)
end
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def get_by_id(nil), do: nil
def get_by_id(id), do: Repo.get(Object, id)
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def get_by_ap_id(nil), do: nil
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def get_by_ap_id(ap_id) do
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Repo.one(from(object in Object, where: fragment("(?)->>'id' = ?", object.data, ^ap_id)))
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(%Object{} = object, _), do: object
def normalize(%Activity{object: %Object{} = object}, _), do: object
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# A hack for fake activities
def normalize(%Activity{data: %{"object" => %{"fake" => true} = data}}, _) do
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%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(ap_id, true) when is_binary(ap_id), do: Fetcher.fetch_object_from_id!(ap_id)
def normalize(_, _), do: nil
# 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
# Legacy objects can be mutated by anybody
def authorize_mutation(%Object{}, %User{}), do: true
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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)
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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 {: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, deleted_activity}
end
end
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def prune(%Object{data: %{"id" => id}} = object) do
with {:ok, object} <- Repo.delete(object),
{:ok, true} <- Cachex.del(:object_cache, "object:#{id}") do
{:ok, object}
end
end
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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
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def increase_vote_count(ap_id, name) do
with %Object{} = object <- Object.normalize(ap_id),
"Question" <- object.data["type"] do
multiple = Map.has_key?(object.data, "anyOf")
options =
(object.data["anyOf"] || object.data["oneOf"] || [])
|> Enum.map(fn
%{"name" => ^name} = option ->
Kernel.update_in(option["replies"]["totalItems"], &(&1 + 1))
option ->
option
end)
data =
if multiple do
Map.put(object.data, "anyOf", options)
else
Map.put(object.data, "oneOf", options)
end
object
|> Object.change(%{data: data})
|> update_and_set_cache()
else
_ -> :noop
end
end
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end