akkoma/lib/pleroma/plugs/authentication_plug.ex
2017-03-20 17:56:45 +01:00

51 lines
1.2 KiB
Elixir

defmodule Pleroma.Plugs.AuthenticationPlug do
import Plug.Conn
def init(options) do
options
end
def call(conn, opts) do
with {:ok, username, password} <- decode_header(conn),
{:ok, user} <- opts[:fetcher].(username),
{:ok, verified_user} <- verify(user, password)
do
conn |> assign(:user, verified_user)
else
_ -> conn |> halt_or_continue(opts)
end
end
defp verify(nil, _password) do
Comeonin.Pbkdf2.dummy_checkpw
:error
end
defp verify(user, password) do
if Comeonin.Pbkdf2.checkpw(password, user[:password_hash]) do
{:ok, user}
else
:error
end
end
defp decode_header(conn) do
with ["Basic " <> header] <- get_req_header(conn, "authorization"),
{:ok, userinfo} <- Base.decode64(header),
[username, password] <- String.split(userinfo, ":")
do
{ :ok, username, password }
end
end
defp halt_or_continue(conn, %{optional: true}) do
conn |> assign(:user, nil)
end
defp halt_or_continue(conn, _) do
conn
|> put_resp_content_type("application/json")
|> send_resp(403, Poison.encode!(%{error: "Invalid credentials."}))
|> halt
end
end