refresh_token.ex
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refresh_token.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.OAuth.Token.Strategy.RefreshToken do
	@moduledoc """
	Functions for dealing with refresh token strategy.
	"""

	alias Pleroma.Config
	alias Pleroma.Repo
	alias Pleroma.Web.OAuth.Token
	alias Pleroma.Web.OAuth.Token.Strategy.Revoke

	@doc """
	Will grant access token by refresh token.
	"""
	@spec grant(Token.t()) :: {:ok, Token.t()} \| {:error, any()}
	def grant(token) do
	access_token = Repo.preload(token, [:user, :app])

	result =
	Repo.transaction(fn ->
	token_params = %{
	app: access_token.app,
	user: access_token.user,
	scopes: access_token.scopes
	}

	access_token
	\|> revoke_access_token()
	\|> create_access_token(token_params)
	end)

	case result do
	{:ok, {:error, reason}} -> {:error, reason}
	{:ok, {:ok, token}} -> {:ok, token}
	{:error, reason} -> {:error, reason}
	end
	end

	defp revoke_access_token(token) do
	Revoke.revoke(token)
	end

	defp create_access_token({:error, error}, _), do: {:error, error}

	defp create_access_token({:ok, token}, %{app: app, user: user} = token_params) do
	Token.create(app, user, add_refresh_token(token_params, token.refresh_token))
	end

	defp add_refresh_token(params, token) do
	case Config.get([:oauth2, :issue_new_refresh_token], false) do
	true -> Map.put(params, :refresh_token, token)
	false -> params
	end
	end
	end