defmodule Nola.Account do
alias Nola.UserTrack.User
@moduledoc """
Account registry....
Maps a network predicate:
* `{net, {:nick, nickname}}`
* `{net, {:account, account}}`
* `{net, {:mask, user@host}}`
to an unique identifier, that can be shared over multiple networks.
If a predicate cannot be found for an existing account, a new account will be made in the database.
To link two existing accounts from different network onto a different one, a merge operation is provided.
"""
# FIXME: Ensure uniqueness of name?
@derive {Poison.Encoder, except: [:token]}
defstruct [:id, :name, :token]
@type t :: %__MODULE__{id: id(), name: String.t()}
@type id :: String.t()
defimpl Inspect, for: __MODULE__ do
import Inspect.Algebra
def inspect(%{id: id, name: name}, opts) do
concat(["#Nola.Account[", id, " ", name, "]"])
end
end
def file(base) do
to_charlist(Nola.data_path() <> "/account_#{base}.dets")
end
defp from_struct(%__MODULE__{id: id, name: name, token: token}) do
{id, name, token}
end
defp from_tuple({id, name, token}) do
%__MODULE__{id: id, name: name, token: token}
end
def start_link() do
GenServer.start_link(__MODULE__, [], [name: __MODULE__])
end
def init(_) do
{:ok, accounts} = :dets.open_file(file("db"), [])
{:ok, meta} = :dets.open_file(file("meta"), [])
{:ok, predicates} = :dets.open_file(file("predicates"), [{:type, :set}])
{:ok, %{accounts: accounts, meta: meta, predicates: predicates}}
end
def get(id) do
case :dets.lookup(file("db"), id) do
[account] -> from_tuple(account)
_ -> nil
end
end
def get_by_name(name) do
spec = [{{:_, :"$1", :_}, [{:==, :"$1", {:const, name}}], [:"$_"]}]
case :dets.select(file("db"), spec) do
[account] -> from_tuple(account)
_ -> nil
end
end
def get_meta(%__MODULE__{id: id}, key, default \\ nil) do
case :dets.lookup(file("meta"), {id, key}) do
[{_, value}] -> (value || default)
_ -> default
end
end
@spec find_meta_accounts(String.t()) :: [{account :: t(), value :: String.t()}, ...]
@doc "Find all accounts that have a meta of `key`."
def find_meta_accounts(key) do
spec = [{{{:"$1", :"$2"}, :"$3"}, [{:==, :"$2", {:const, key}}], [{{:"$1", :"$3"}}]}]
for {id, val} <- :dets.select(file("meta"), spec), do: {get(id), val}
end
@doc "Find an account given a specific meta `key` and `value`."
@spec find_meta_account(String.t(), String.t()) :: t() | nil
def find_meta_account(key, value) do
#spec = [{{{:"$1", :"$2"}, :"$3"}, [:andalso, {:==, :"$2", {:const, key}}, {:==, :"$3", {:const, value}}], [:"$1"]}]
spec = [{{{:"$1", :"$2"}, :"$3"}, [{:andalso, {:==, :"$2", {:const, key}}, {:==, {:const, value}, :"$3"}}], [:"$1"]}]
case :dets.select(file("meta"), spec) do
[id] -> get(id)
_ -> nil
end
end
def get_all_meta(%__MODULE__{id: id}) do
spec = [{{{:"$1", :"$2"}, :"$3"}, [{:==, :"$1", {:const, id}}], [{{:"$2", :"$3"}}]}]
:dets.select(file("meta"), spec)
end
def put_user_meta(account = %__MODULE__{}, key, value) do
put_meta(account, "u:"<>key, value)
end
def put_meta(%__MODULE__{id: id}, key, value) do
:dets.insert(file("meta"), {{id, key}, value})
end
def delete_meta(%__MODULE__{id: id}, key) do
:dets.delete(file("meta"), {id, key})
end
def all_accounts() do
:dets.traverse(file("db"), fn(obj) -> {:continue, from_tuple(obj)} end)
end
def all_predicates() do
:dets.traverse(file("predicates"), fn(obj) -> {:continue, obj} end)
end
def all_meta() do
:dets.traverse(file("meta"), fn(obj) -> {:continue, obj} end)
end
def merge_account(old_id, new_id) do
if old_id != new_id do
spec = [{{:"$1", :"$2"}, [{:==, :"$2", {:const, old_id}}], [:"$1"]}]
predicates = :dets.select(file("predicates"), spec)
for pred <- predicates, do: :ok = :dets.insert(file("predicates"), {pred, new_id})
spec = [{{{:"$1", :"$2"}, :"$3"}, [{:==, :"$1", {:const, old_id}}], [{{:"$2", :"$3"}}]}]
metas = :dets.select(file("meta"), spec)
for {k,v} <- metas do
:dets.delete(file("meta"), {{old_id, k}})
:ok = :dets.insert(file("meta"), {{new_id, k}, v})
end
:dets.delete(file("db"), old_id)
Nola.Membership.merge_account(old_id, new_id)
Nola.UserTrack.merge_account(old_id, new_id)
IRC.Connection.dispatch("account", {:account_change, old_id, new_id})
IRC.Connection.dispatch("conn", {:account_change, old_id, new_id})
end
:ok
end
@doc "Find an account by a logged in user"
def find_by_nick(network, nick) do
do_lookup(%ExIRC.SenderInfo{nick: nick, network: network}, false)
end
@doc "Always find an account by nickname, even if offline. Uses predicates and then account name."
def find_always_by_nick(network, chan, nick) do
with \
nil <- find_by_nick(network, nick),
nil <- do_lookup(%User{network: network, nick: nick}, false),
nil <- get_by_name(nick)
do
nil
else
%__MODULE__{} = account ->
memberships = Nola.Membership.of_account(account)
if Enum.any?(memberships, fn({net, ch}) -> (net == network) or (chan && chan == ch) end) do
account
else
nil
end
end
end
def find(something) do
do_lookup(something, false)
end
def lookup(something, make_default \\ true) do
account = do_lookup(something, make_default)
if account && Map.get(something, :nick) do
IRC.Connection.dispatch("account", {:account_auth, Map.get(something, :nick), account.id})
end
account
end
def handle_info(_, state) do
{:noreply, state}
end
def handle_cast(_, state) do
{:noreply, state}
end
def handle_call(_, _, state) do
{:noreply, state}
end
def terminate(_, state) do
for {_, dets} <- state do
:dets.sync(dets)
:dets.close(dets)
end
end
defp do_lookup(message = %IRC.Message{account: account_id}, make_default) when is_binary(account_id) do
get(account_id)
end
defp do_lookup(sender = %ExIRC.Who{}, make_default) do
if user = Nola.UserTrack.find_by_nick(sender) do
lookup(user, make_default)
else
#FIXME this will never work with continued lookup by other methods as Who isn't compatible
lookup_by_nick(sender, :dets.lookup(file("predicates"), {sender.network,{:nick, sender.nick}}), make_default)
end
end
defp do_lookup(sender = %ExIRC.SenderInfo{}, make_default) do
lookup(Nola.UserTrack.find_by_nick(sender), make_default)
end
defp do_lookup(user = %User{account: id}, make_default) when is_binary(id) do
get(id)
end
defp do_lookup(user = %User{network: server, nick: nick}, make_default) do
lookup_by_nick(user, :dets.lookup(file("predicates"), {server,{:nick, nick}}), make_default)
end
defp do_lookup(nil, _) do
nil
end
defp lookup_by_nick(_, [{_, id}], _make_default) do
get(id)
end
defp lookup_by_nick(user, _, make_default) do
#authenticate_by_host(user)
if make_default, do: new_account(user), else: nil
end
def new_account(nick) do
id = EntropyString.large_id()
:dets.insert(file("db"), {id, nick, EntropyString.token()})
get(id)
end
def new_account(%{nick: nick, network: server}) do
id = EntropyString.large_id()
:dets.insert(file("db"), {id, nick, EntropyString.token()})
:dets.insert(file("predicates"), {{server, {:nick, nick}}, id})
get(id)
end
def update_account_name(account = %__MODULE__{id: id}, name) do
account = %__MODULE__{account | name: name}
:dets.insert(file("db"), from_struct(account))
get(id)
end
def get_predicates(%__MODULE__{} = account) do
spec = [{{:"$1", :"$2"}, [{:==, :"$2", {:const, account.id}}], [:"$1"]}]
:dets.select(file("predicates"), spec)
end
end
