mobilizon/lib/federation/activity_pub/permission.ex

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defmodule Mobilizon.Federation.ActivityPub.Permission do
@moduledoc """
Module to check group members permissions on objects
"""
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Federation.ActivityPub.Types.{Entity, Ownable}
require Logger
use StructAccess
defstruct [:access, :create, :update, :delete]
@member_roles [:member, :moderator, :administrator]
@type object :: %{id: String.t(), url: String.t()}
@doc """
Check that actor can access the object
"""
@spec can_access_group_object?(Actor.t(), Entity.t()) :: boolean()
def can_access_group_object?(%Actor{} = actor, object) do
can_manage_group_object?(:access, actor, object)
end
@doc """
Check that actor can create such an object
"""
@spec can_create_group_object?(String.t() | integer(), String.t() | integer(), Entity.t()) ::
boolean()
def can_create_group_object?(
actor_id,
group_id,
object
) do
case object |> Ownable.permissions() |> get_in([:create]) do
:member ->
Actors.is_member?(actor_id, group_id)
:moderator ->
Actors.is_moderator?(actor_id, group_id)
:administrator ->
Actors.is_administrator?(actor_id, group_id)
_ ->
false
end
end
@doc """
Check that actor can update the object
"""
@spec can_update_group_object?(Actor.t(), Entity.t()) :: boolean()
def can_update_group_object?(%Actor{} = actor, object) do
can_manage_group_object?(:update, actor, object)
end
@doc """
Check that actor can delete the object
"""
@spec can_delete_group_object?(Actor.t(), Entity.t()) :: boolean()
def can_delete_group_object?(%Actor{} = actor, object) do
can_manage_group_object?(:delete, actor, object)
end
@type existing_object_permissions :: :access | :update | :delete
@spec can_manage_group_object?(
existing_object_permissions(),
%Actor{url: String.t()},
object()
) :: boolean()
defp can_manage_group_object?(permission, %Actor{url: actor_url} = actor, object) do
if Ownable.group_actor(object) != nil do
case object |> Ownable.permissions() |> get_in([permission]) do
role when role in @member_roles ->
activity_actor_is_group_member?(actor, object, role)
_ ->
case permission do
:access ->
Logger.warn("Actor #{actor_url} can't access #{object.url}")
:update ->
Logger.warn("Actor #{actor_url} can't update #{object.url}")
:delete ->
Logger.warn("Actor #{actor_url} can't delete #{object.url}")
end
false
end
else
true
end
end
@spec activity_actor_is_group_member?(Actor.t(), object(), atom()) :: boolean()
defp activity_actor_is_group_member?(
%Actor{id: actor_id, url: actor_url},
object,
role
) do
case Ownable.group_actor(object) do
%Actor{type: :Group, id: group_id, url: group_url} ->
Logger.debug("Group object url is #{group_url}")
case role do
:moderator ->
Logger.debug(
"Checking if activity actor #{actor_url} is a moderator from group from #{object.url}"
)
Actors.is_moderator?(actor_id, group_id)
:administrator ->
Logger.debug(
"Checking if activity actor #{actor_url} is an administrator from group from #{object.url}"
)
Actors.is_administrator?(actor_id, group_id)
_ ->
Logger.debug(
"Checking if activity actor #{actor_url} is a member from group from #{object.url}"
)
Actors.is_member?(actor_id, group_id)
end
_ ->
false
end
end
end