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openmaize lib openmaize keymanager.ex
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lib/openmaize/keymanager.ex

defmodule Openmaize.Keymanager do
use GenServer
alias Openmaize.Config
@oneday 86_400_000
def start_link() do
GenServer.start_link(__MODULE__, [], name: __MODULE__)
end
def init([]) do
Process.send_after(self, :rotate, Config.keyrotate_days * @oneday)
{:ok, %{key_1: get_key, key_2: get_key, current_kid: "1"}}
end
def get_key("1"), do: GenServer.call(__MODULE__, :get_key_1)
def get_key("2"), do: GenServer.call(__MODULE__, :get_key_2)
def get_current_kid do
GenServer.call(__MODULE__, :get_current_kid)
end
def handle_call(:get_key_1, _from, %{key_1: key} = state) do
{:reply, key, state}
end
def handle_call(:get_key_2, _from, %{key_2: key} = state) do
{:reply, key, state}
end
def handle_call(:get_current_kid, _from, %{current_kid: kid} = state) do
{:reply, kid, state}
end
def handle_info(:rotate, state) do
state = update_state(state)
Process.send_after(self, :rotate, Config.keyrotate_days * @oneday)
{:noreply, state}
end
def handle_info(_msg, state) do
{:noreply, state}
end
def code_change(_old, state, _extra) do
{:ok, state}
end
defp update_state(%{current_kid: "1"} = state) do
%{state | current_kid: "2", key_2: get_key}
end
defp update_state(%{current_kid: "2"} = state) do
%{state | current_kid: "1", key_1: get_key}
end
defp get_key do
:crypto.strong_rand_bytes(32) |> Base.encode64
end
end