63 lines
1.5 KiB
Elixir
63 lines
1.5 KiB
Elixir
defmodule Pleroma.Plugs.AuthenticationPlug do
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alias Comeonin.Pbkdf2
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import Plug.Conn
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alias Pleroma.User
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def init(options) do
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options
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end
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def call(%{assigns: %{user: %User{}}} = conn, _), do: conn
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def call(conn, opts) do
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with {:ok, username, password} <- decode_header(conn),
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{:ok, user} <- opts[:fetcher].(username),
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saved_user_id <- get_session(conn, :user_id),
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{:ok, verified_user} <- verify(user, password, saved_user_id)
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do
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conn
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|> assign(:user, verified_user)
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|> put_session(:user_id, verified_user.id)
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else
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_ -> conn |> halt_or_continue(opts)
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end
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end
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# Short-circuit if we have a cookie with the id for the given user.
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defp verify(%{id: id} = user, _password, id) do
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{:ok, user}
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end
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defp verify(nil, _password, _user_id) do
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Pbkdf2.dummy_checkpw
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:error
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end
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defp verify(user, password, _user_id) do
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if Pbkdf2.checkpw(password, user.password_hash) do
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{:ok, user}
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else
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:error
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end
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end
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defp decode_header(conn) do
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with ["Basic " <> header] <- get_req_header(conn, "authorization"),
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{:ok, userinfo} <- Base.decode64(header),
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[username, password] <- String.split(userinfo, ":")
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do
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{:ok, username, password}
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end
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end
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defp halt_or_continue(conn, %{optional: true}) do
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conn |> assign(:user, nil)
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end
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defp halt_or_continue(conn, _) do
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conn
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|> put_resp_content_type("application/json")
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|> send_resp(403, Poison.encode!(%{error: "Invalid credentials."}))
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|> halt
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end
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end
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