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utils.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.Utils do
@moduledoc """
Auxiliary functions for dealing with tokens.
"""
alias Pleroma.Repo
alias Pleroma.Web.OAuth.App
@doc "Fetch app by client credentials from request"
@spec fetch_app(Plug.Conn.t()) :: {:ok, App.t()} | {:error, :not_found}
def fetch_app(conn) do
res =
conn
|> fetch_client_credentials()
|> fetch_client
case res do
%App{} = app -> {:ok, app}
_ -> {:error, :not_found}
end
end
defp fetch_client({id, secret}) when is_binary(id) and is_binary(secret) do
Repo.get_by(App, client_id: id, client_secret: secret)
end
defp fetch_client({_id, _secret}), do: nil
defp fetch_client_credentials(conn) do
# Per RFC 6749, HTTP Basic is preferred to body params
with ["Basic " <> encoded] <- Plug.Conn.get_req_header(conn, "authorization"),
{:ok, decoded} <- Base.decode64(encoded),
[id, secret] <-
Enum.map(
String.split(decoded, ":"),
fn s -> URI.decode_www_form(s) end
) do
{id, secret}
else
_ -> {conn.params["client_id"], conn.params["client_secret"]}
end
end
@doc "convert token inserted_at to unix timestamp"
def format_created_at(%{inserted_at: inserted_at} = _token) do
inserted_at
|> DateTime.from_naive!("Etc/UTC")
|> DateTime.to_unix()
end
@doc false
@spec generate_token(keyword()) :: binary()
def generate_token(opts \\ []) do
opts
|> Keyword.get(:size, 32)
|> :crypto.strong_rand_bytes()
|> Base.url_encode64(padding: false)
end
# XXX - for whatever reason our token arrives urlencoded, but Plug.Conn should be
# decoding it. Investigate sometime.
def fix_padding(token) do
token
|> URI.decode()
|> Base.url_decode64!(padding: false)
|> Base.url_encode64(padding: false)
end
end

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