130 lines
3.5 KiB
Elixir
130 lines
3.5 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.ActivityPub.ObjectValidators.ChatMessageValidator do
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use Ecto.Schema
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alias Pleroma.EctoType.ActivityPub.ObjectValidators
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alias Pleroma.User
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alias Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidator
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import Ecto.Changeset
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import Pleroma.Web.ActivityPub.Transmogrifier, only: [fix_emoji: 1]
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@primary_key false
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@derive Jason.Encoder
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embedded_schema do
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field(:id, ObjectValidators.ObjectID, primary_key: true)
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field(:to, ObjectValidators.Recipients, default: [])
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field(:type, :string)
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field(:content, ObjectValidators.SafeText)
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field(:actor, ObjectValidators.ObjectID)
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field(:published, ObjectValidators.DateTime)
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field(:emoji, ObjectValidators.Emoji, default: %{})
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embeds_one(:attachment, AttachmentValidator)
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end
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def cast_and_apply(data) do
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data
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|> cast_data
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|> apply_action(:insert)
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end
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def cast_and_validate(data) do
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data
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|> cast_data()
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|> validate_data()
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end
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def cast_data(data) do
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%__MODULE__{}
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|> changeset(data)
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end
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def fix(data) do
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data
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|> fix_emoji()
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|> fix_attachment()
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|> Map.put_new("actor", data["attributedTo"])
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end
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# Throws everything but the first one away
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def fix_attachment(%{"attachment" => [attachment | _]} = data) do
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data
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|> Map.put("attachment", attachment)
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end
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def fix_attachment(data), do: data
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def changeset(struct, data) do
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data = fix(data)
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struct
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|> cast(data, List.delete(__schema__(:fields), :attachment))
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|> cast_embed(:attachment)
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end
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defp validate_data(data_cng) do
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data_cng
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|> validate_inclusion(:type, ["ChatMessage"])
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|> validate_required([:id, :actor, :to, :type, :published])
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|> validate_content_or_attachment()
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|> validate_length(:to, is: 1)
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|> validate_length(:content, max: Pleroma.Config.get([:instance, :remote_limit]))
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|> validate_local_concern()
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end
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def validate_content_or_attachment(cng) do
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attachment = get_field(cng, :attachment)
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if attachment do
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cng
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else
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cng
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|> validate_required([:content])
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end
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end
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@doc """
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Validates the following
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- If both users are in our system
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- If at least one of the users in this ChatMessage is a local user
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- If the recipient is not blocking the actor
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- If the recipient is explicitly not accepting chat messages
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"""
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def validate_local_concern(cng) do
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with actor_ap <- get_field(cng, :actor),
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{_, %User{} = actor} <- {:find_actor, User.get_cached_by_ap_id(actor_ap)},
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{_, %User{} = recipient} <-
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{:find_recipient, User.get_cached_by_ap_id(get_field(cng, :to) |> hd())},
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{_, false} <- {:not_accepting_chats?, recipient.accepts_chat_messages == false},
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{_, false} <- {:blocking_actor?, User.blocks?(recipient, actor)},
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{_, true} <- {:local?, Enum.any?([actor, recipient], & &1.local)} do
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cng
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else
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{:blocking_actor?, true} ->
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cng
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|> add_error(:actor, "actor is blocked by recipient")
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{:not_accepting_chats?, true} ->
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cng
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|> add_error(:to, "recipient does not accept chat messages")
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{:local?, false} ->
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cng
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|> add_error(:actor, "actor and recipient are both remote")
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{:find_actor, _} ->
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cng
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|> add_error(:actor, "can't find user")
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{:find_recipient, _} ->
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cng
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|> add_error(:to, "can't find user")
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end
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end
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end
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