130 lines
4.2 KiB
Elixir
130 lines
4.2 KiB
Elixir
defmodule MatrixServer.RoomServer do
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use GenServer
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import Ecto.Query
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alias MatrixServer.{Repo, Room, Event, Account, StateResolution}
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alias MatrixServerWeb.API.CreateRoom
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@registry MatrixServer.RoomServer.Registry
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@supervisor MatrixServer.RoomServer.Supervisor
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def create_room(input, account) do
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%Room{id: room_id} = room = Repo.insert!(Room.create_changeset(input))
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opts = [
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name: {:via, Registry, {@registry, room_id}},
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input: input,
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account: account,
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room: room
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]
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DynamicSupervisor.start_child(@supervisor, {__MODULE__, opts})
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end
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def start_link(opts) do
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{name, opts} = Keyword.pop(opts, :name)
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GenServer.start_link(__MODULE__, opts, name: name)
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end
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@impl true
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def init(opts) do
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%Room{id: room_id} = room = Keyword.fetch!(opts, :room)
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input = Keyword.fetch!(opts, :input)
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account = Keyword.fetch!(opts, :account)
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state_set = %{}
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Repo.transaction(fn ->
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with {:ok, create_room_event, state_set} <-
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room_creation_create_room(account, input, room, state_set),
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{:ok, join_creator_event, state_set} <-
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room_creation_join_creator(account, room, state_set, create_room_event),
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{:ok, _power_levels_event, state_set} <-
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room_creation_power_levels(
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account,
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room,
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state_set,
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create_room_event,
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join_creator_event
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) do
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{:ok, %{room_id: room_id, state_set: state_set}}
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else
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_ -> {:error, :something}
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end
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end)
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end
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defp room_creation_create_room(
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%Account{localpart: localpart},
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%CreateRoom{room_version: room_version},
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%Room{id: room_id},
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_state_set
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) do
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Event.create_room(room_id, MatrixServer.get_mxid(localpart), room_version)
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|> verify_and_insert_event(%{})
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end
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defp room_creation_join_creator(
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%Account{localpart: localpart},
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%Room{id: room_id},
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state_set,
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%Event{event_id: create_room_id}
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) do
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Event.join(room_id, MatrixServer.get_mxid(localpart))
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|> Map.put(:auth_events, [create_room_id])
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|> Map.put(:prev_events, [create_room_id])
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|> verify_and_insert_event(state_set)
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end
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defp room_creation_power_levels(
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%Account{localpart: localpart},
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%Room{id: room_id},
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state_set,
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%Event{event_id: create_room_id},
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%Event{event_id: join_creator_id}
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) do
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Event.power_levels(room_id, MatrixServer.get_mxid(localpart))
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|> Map.put(:auth_events, [create_room_id, join_creator_id])
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|> Map.put(:prev_events, [join_creator_id])
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|> verify_and_insert_event(state_set)
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end
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defp verify_and_insert_event(event, current_state_set) do
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# Check the following things:
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# 1. TODO: Is a valid event, otherwise it is dropped.
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# 2. TODO: Passes signature checks, otherwise it is dropped.
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# 3. TODO: Passes hash checks, otherwise it is redacted before being processed further.
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# 4. Passes authorization rules based on the event's auth events, otherwise it is rejected.
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# 5. Passes authorization rules based on the state at the event, otherwise it is rejected.
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# 6. Passes authorization rules based on the current state of the room, otherwise it is "soft failed".
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if Event.prevalidate(event) do
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if StateResolution.is_authorized_by_auth_events(event) do
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state_set = StateResolution.resolve(event, false)
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if StateResolution.is_authorized(event, state_set) do
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if StateResolution.is_authorized(event, current_state_set) do
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# We assume here that the event is always a forward extremity.
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Room.update_forward_extremities(event)
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{:ok, event} = Repo.insert(event)
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state_set = StateResolution.resolve_forward_extremities(event)
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{:ok, event, state_set}
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else
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{:error, :soft_failed}
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end
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else
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{:error, :rejected}
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end
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else
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{:error, :rejected}
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end
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else
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{:error, :invalid}
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end
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end
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def testing do
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account = Repo.one!(from a in Account, limit: 1)
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create_room(%CreateRoom{}, account)
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end
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end
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