mobilizon/lib/mobilizon_web/resolvers/group.ex

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Elixir
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defmodule MobilizonWeb.Resolvers.Group do
@moduledoc """
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Handles the group-related GraphQL calls.
"""
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alias Mobilizon.Actors
alias Mobilizon.Actors.{Actor, Member}
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alias Mobilizon.Service.ActivityPub
alias Mobilizon.Users.User
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alias MobilizonWeb.API
alias MobilizonWeb.Resolvers.Person
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require Logger
@doc """
Find a group
"""
def find_group(_parent, %{preferred_username: name}, _resolution) do
with {:ok, actor} <- ActivityPub.find_or_make_group_from_nickname(name),
actor <- Person.proxify_pictures(actor) do
{:ok, actor}
else
_ ->
{:error, "Group with name #{name} not found"}
end
end
@doc """
Lists all groups
"""
def list_groups(_parent, %{page: page, limit: limit}, _resolution) do
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{
:ok,
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page
|> Actors.list_groups(limit)
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|> Enum.map(fn actor -> Person.proxify_pictures(actor) end)
}
end
@doc """
Create a new group. The creator is automatically added as admin
"""
def create_group(
_parent,
args,
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%{context: %{current_user: user}}
) do
with creator_actor_id <- Map.get(args, :creator_actor_id),
{:is_owned, %Actor{} = creator_actor} <- User.owns_actor(user, creator_actor_id),
args <- Map.put(args, :creator_actor, creator_actor),
{:ok, _activity, %Actor{type: :Group} = group} <-
API.Groups.create_group(args) do
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{:ok, group}
else
{:error, err} when is_bitstring(err) ->
{:error, err}
{:is_owned, nil} ->
{:error, "Creator actor id is not owned by the current user"}
end
end
def create_group(_parent, _args, _resolution) do
{:error, "You need to be logged-in to create a group"}
end
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@doc """
Delete an existing group
"""
def delete_group(
_parent,
%{group_id: group_id, actor_id: actor_id},
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%{context: %{current_user: user}}
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) do
with {actor_id, ""} <- Integer.parse(actor_id),
{group_id, ""} <- Integer.parse(group_id),
{:ok, %Actor{} = group} <- Actors.get_group_by_actor_id(group_id),
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{:is_owned, %Actor{}} <- User.owns_actor(user, actor_id),
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{:ok, %Member{} = member} <- Actors.get_member(actor_id, group.id),
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{:is_admin, true} <- Member.is_administrator(member),
group <- Actors.delete_group!(group) do
{:ok, %{id: group.id}}
else
{:error, :group_not_found} ->
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{:error, "Group not found"}
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{:is_owned, nil} ->
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{:error, "Actor id is not owned by authenticated user"}
{:error, :member_not_found} ->
{:error, "Actor id is not a member of this group"}
{:is_admin, false} ->
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{:error, "Actor id is not an administrator of the selected group"}
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end
end
def delete_group(_parent, _args, _resolution) do
{:error, "You need to be logged-in to delete a group"}
end
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@doc """
Join an existing group
"""
def join_group(
_parent,
%{group_id: group_id, actor_id: actor_id},
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%{context: %{current_user: user}}
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) do
with {actor_id, ""} <- Integer.parse(actor_id),
{group_id, ""} <- Integer.parse(group_id),
{:is_owned, %Actor{} = actor} <- User.owns_actor(user, actor_id),
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{:ok, %Actor{} = group} <- Actors.get_group_by_actor_id(group_id),
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{:error, :member_not_found} <- Actors.get_member(actor.id, group.id),
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{:is_able_to_join, true} <- {:is_able_to_join, Member.can_be_joined(group)},
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role <- Member.get_default_member_role(group),
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{:ok, _} <- Actors.create_member(%{parent_id: group.id, actor_id: actor.id, role: role}) do
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{
:ok,
%{
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parent: Person.proxify_pictures(group),
actor: Person.proxify_pictures(actor),
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role: role
}
}
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else
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{:is_owned, nil} ->
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{:error, "Actor id is not owned by authenticated user"}
{:error, :group_not_found} ->
{:error, "Group id not found"}
{:is_able_to_join, false} ->
{:error, "You cannot join this group"}
{:ok, %Member{}} ->
{:error, "You are already a member of this group"}
end
end
def join_group(_parent, _args, _resolution) do
{:error, "You need to be logged-in to join a group"}
end
@doc """
Leave a existing group
"""
def leave_group(
_parent,
%{group_id: group_id, actor_id: actor_id},
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%{context: %{current_user: user}}
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) do
with {actor_id, ""} <- Integer.parse(actor_id),
{group_id, ""} <- Integer.parse(group_id),
{:is_owned, %Actor{} = actor} <- User.owns_actor(user, actor_id),
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{:ok, %Member{} = member} <- Actors.get_member(actor.id, group_id),
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{:only_administrator, false} <-
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{:only_administrator, check_that_member_is_not_last_administrator(group_id, actor_id)},
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{:ok, _} <-
Mobilizon.Actors.delete_member(member) do
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{:ok, %{parent: %{id: group_id}, actor: %{id: actor_id}}}
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else
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{:is_owned, nil} ->
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{:error, "Actor id is not owned by authenticated user"}
{:error, :member_not_found} ->
{:error, "Member not found"}
{:only_administrator, true} ->
{:error, "You can't leave this group because you are the only administrator"}
end
end
def leave_group(_parent, _args, _resolution) do
{:error, "You need to be logged-in to leave a group"}
end
# We check that the actor asking to leave the group is not it's only administrator
# We start by fetching the list of administrator or creators and if there's only one of them
# and that it's the actor requesting leaving the group we return true
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@spec check_that_member_is_not_last_administrator(integer(), integer()) :: boolean()
defp check_that_member_is_not_last_administrator(group_id, actor_id) do
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case Actors.list_administrator_members_for_group(group_id) do
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[%Member{actor: %Actor{id: member_actor_id}}] ->
actor_id == member_actor_id
_ ->
false
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end
end
end