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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.ObjectValidators.ChatMessageValidator do
use Ecto.Schema
alias Pleroma.EctoType.ActivityPub.ObjectValidators
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidator
import Ecto.Changeset
import Pleroma.Web.ActivityPub.Transmogrifier, only: [fix_emoji: 1]
@primary_key false
@derive Jason.Encoder
embedded_schema do
field(:id, ObjectValidators.ObjectID, primary_key: true)
field(:to, ObjectValidators.Recipients, default: [])
field(:type, :string)
field(:content, ObjectValidators.SafeText)
field(:actor, ObjectValidators.ObjectID)
field(:published, ObjectValidators.DateTime)
field(:emoji, ObjectValidators.Emoji, default: %{})
embeds_one(:attachment, AttachmentValidator)
end
def cast_and_apply(data) do
data
|> cast_data
|> apply_action(:insert)
end
def cast_and_validate(data) do
data
|> cast_data()
|> validate_data()
end
def cast_data(data) do
%__MODULE__{}
|> changeset(data)
end
def fix(data) do
data
|> fix_emoji()
|> fix_attachment()
|> Map.put_new("actor", data["attributedTo"])
end
# Throws everything but the first one away
def fix_attachment(%{"attachment" => [attachment | _]} = data) do
data
|> Map.put("attachment", attachment)
end
def fix_attachment(%{"attachment" => attachment} = data) when attachment == [] do
data
|> Map.drop(["attachment"])
end
def fix_attachment(data), do: data
def changeset(struct, data) do
data = fix(data)
struct
|> cast(data, List.delete(__schema__(:fields), :attachment))
|> cast_embed(:attachment)
end
defp validate_data(data_cng) do
data_cng
|> validate_inclusion(:type, ["ChatMessage"])
|> validate_required([:id, :actor, :to, :type, :published])
|> validate_content_or_attachment()
|> validate_length(:to, is: 1)
|> validate_length(:content, max: Pleroma.Config.get([:instance, :remote_limit]))
|> validate_local_concern()
end
def validate_content_or_attachment(cng) do
attachment = get_field(cng, :attachment)
if attachment do
cng
else
cng
|> validate_required([:content])
end
end
@doc """
Validates the following
- If both users are in our system
- If at least one of the users in this ChatMessage is a local user
- If the recipient is not blocking the actor
- If the recipient is explicitly not accepting chat messages
"""
def validate_local_concern(cng) do
with actor_ap <- get_field(cng, :actor),
{_, %User{} = actor} <- {:find_actor, User.get_cached_by_ap_id(actor_ap)},
{_, %User{} = recipient} <-
{:find_recipient, User.get_cached_by_ap_id(get_field(cng, :to) |> hd())},
{_, false} <- {:not_accepting_chats?, recipient.accepts_chat_messages == false},
{_, false} <- {:blocking_actor?, User.blocks?(recipient, actor)},
{_, true} <- {:local?, Enum.any?([actor, recipient], & &1.local)} do
cng
else
{:blocking_actor?, true} ->
cng
|> add_error(:actor, "actor is blocked by recipient")
{:not_accepting_chats?, true} ->
cng
|> add_error(:to, "recipient does not accept chat messages")
{:local?, false} ->
cng
|> add_error(:actor, "actor and recipient are both remote")
{:find_actor, _} ->
cng
|> add_error(:actor, "can't find user")
{:find_recipient, _} ->
cng
|> add_error(:to, "can't find user")
end
end
end
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