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

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