109 lines
3 KiB
Elixir
109 lines
3 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.Plugs.OAuthPlug do
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@moduledoc "Performs OAuth authentication by token from params / headers / cookies."
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import Plug.Conn
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import Ecto.Query
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alias Pleroma.Helpers.AuthHelper
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alias Pleroma.Repo
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alias Pleroma.User
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alias Pleroma.Web.OAuth.App
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alias Pleroma.Web.OAuth.Token
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@realm_reg Regex.compile!("Bearer\:?\s+(.*)$", "i")
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def init(options), do: options
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def call(%{assigns: %{user: %User{}}} = conn, _), do: conn
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def call(conn, _) do
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with {:ok, token_str} <- fetch_token_str(conn) do
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with {:ok, user, user_token} <- fetch_user_and_token(token_str),
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false <- Token.is_expired?(user_token) do
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conn
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|> assign(:token, user_token)
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|> assign(:user, user)
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else
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_ ->
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with {:ok, app, app_token} <- fetch_app_and_token(token_str),
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false <- Token.is_expired?(app_token) do
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conn
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|> assign(:token, app_token)
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|> assign(:app, app)
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else
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_ -> conn
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end
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end
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else
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_ -> conn
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end
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end
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# Gets user by token
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#
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@spec fetch_user_and_token(String.t()) :: {:ok, User.t(), Token.t()} | nil
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defp fetch_user_and_token(token) do
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token_query =
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from(t in Token,
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where: t.token == ^token
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)
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with %Token{user_id: user_id} = token_record <- Repo.one(token_query),
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false <- is_nil(user_id),
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%User{} = user <- User.get_cached_by_id(user_id) do
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{:ok, user, token_record}
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else
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_ -> nil
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end
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end
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@spec fetch_app_and_token(String.t()) :: {:ok, App.t(), Token.t()} | nil
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defp fetch_app_and_token(token) do
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query =
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from(t in Token, where: t.token == ^token, join: app in assoc(t, :app), preload: [app: app])
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with %Token{app: app} = token_record <- Repo.one(query) do
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{:ok, app, token_record}
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end
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end
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# Gets token string from conn (in params / headers / session)
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#
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@spec fetch_token_str(Plug.Conn.t() | list(String.t())) :: :no_token_found | {:ok, String.t()}
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defp fetch_token_str(%Plug.Conn{params: %{"access_token" => access_token}} = _conn) do
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{:ok, access_token}
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end
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defp fetch_token_str(%Plug.Conn{} = conn) do
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headers = get_req_header(conn, "authorization")
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with {:ok, token} <- fetch_token_str(headers) do
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{:ok, token}
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else
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_ -> fetch_token_from_session(conn)
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end
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end
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defp fetch_token_str([token | tail]) do
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trimmed_token = String.trim(token)
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case Regex.run(@realm_reg, trimmed_token) do
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[_, match] -> {:ok, String.trim(match)}
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_ -> fetch_token_str(tail)
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end
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end
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defp fetch_token_str([]), do: :no_token_found
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@spec fetch_token_from_session(Plug.Conn.t()) :: :no_token_found | {:ok, String.t()}
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defp fetch_token_from_session(conn) do
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case AuthHelper.get_session_token(conn) do
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nil -> :no_token_found
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token -> {:ok, token}
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end
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end
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end
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