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create_generic_validator.ex
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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
# Code based on CreateChatMessageValidator
# NOTES
# - doesn't embed, will only get the object id
defmodule Pleroma.Web.ActivityPub.ObjectValidators.CreateGenericValidator do
use Ecto.Schema
alias Pleroma.EctoType.ActivityPub.ObjectValidators
alias Pleroma.Object
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes
alias Pleroma.Web.ActivityPub.ObjectValidators.CommonValidations
alias Pleroma.Web.ActivityPub.Transmogrifier
import Ecto.Changeset
@primary_key false
embedded_schema do
quote do
unquote do
import Elixir.Pleroma.Web.ActivityPub.ObjectValidators.CommonFields
message_fields()
activity_fields()
end
end
field(:expires_at, ObjectValidators.DateTime)
# Should be moved to object, done for CommonAPI.Utils.make_context
field(:context, :string)
end
def cast_data(data, meta \\ []) do
data = fix(data, meta)
%__MODULE__{}
|> changeset(data)
end
def cast_and_apply(data) do
data
|> cast_data
|> apply_action(:insert)
end
def cast_and_validate(data, meta \\ []) do
data
|> cast_data(meta)
|> validate_data(meta)
end
def changeset(struct, data) do
struct
|> cast(data, __schema__(:fields))
end
# CommonFixes.fix_activity_addressing adapted for Create specific behavior
defp fix_addressing(data, object) do
%User{follower_address: follower_collection} = User.get_cached_by_ap_id(data["actor"])
data
|> CommonFixes.cast_and_filter_recipients("to", follower_collection, object["to"])
|> CommonFixes.cast_and_filter_recipients("cc", follower_collection, object["cc"])
|> CommonFixes.cast_and_filter_recipients("bto", follower_collection, object["bto"])
|> CommonFixes.cast_and_filter_recipients("bcc", follower_collection, object["bcc"])
|> Transmogrifier.fix_implicit_addressing(follower_collection)
end
def fix(data, meta) do
object = meta[:object_data]
data
|> CommonFixes.fix_actor()
|> Map.put("context", object["context"])
|> fix_addressing(object)
end
defp validate_data(cng, meta) do
object = meta[:object_data]
cng
|> validate_required([:actor, :type, :object, :to, :cc])
|> validate_inclusion(:type, ["Create"])
|> CommonValidations.validate_actor_presence()
|> validate_actors_match(object)
|> validate_context_match(object)
|> validate_addressing_match(object)
|> validate_object_nonexistence()
|> validate_object_containment()
end
def validate_object_containment(cng) do
actor = get_field(cng, :actor)
cng
|> validate_change(:object, fn :object, object_id ->
%URI{host: object_id_host} = URI.parse(object_id)
%URI{host: actor_host} = URI.parse(actor)
if object_id_host == actor_host do
[]
else
[{:object, "The host of the object id doesn't match with the host of the actor"}]
end
end)
end
def validate_object_nonexistence(cng) do
cng
|> validate_change(:object, fn :object, object_id ->
if Object.get_cached_by_ap_id(object_id) do
[{:object, "The object to create already exists"}]
else
[]
end
end)
end
def validate_actors_match(cng, object) do
attributed_to = object["attributedTo"] || object["actor"]
cng
|> validate_change(:actor, fn :actor, actor ->
if actor == attributed_to do
[]
else
[{:actor, "Actor doesn't match with object attributedTo"}]
end
end)
end
def validate_context_match(cng, %{"context" => object_context}) do
cng
|> validate_change(:context, fn :context, context ->
if context == object_context do
[]
else
[{:context, "context field not matching between Create and object (#{object_context})"}]
end
end)
end
def validate_addressing_match(cng, object) do
[:to, :cc, :bcc, :bto]
|> Enum.reduce(cng, fn field, cng ->
object_data = object[to_string(field)]
validate_change(cng, field, fn field, data ->
if data == object_data do
[]
else
[{field, "field doesn't match with object (#{inspect(object_data)})"}]
end
end)
end)
end
end

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