oauth_scopes_plug.ex
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oauth_scopes_plug.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Plugs.OAuthScopesPlug do
	import Plug.Conn

	@behaviour Plug

	def init(%{scopes: _} = options), do: options

	def call(%Plug.Conn{assigns: assigns} = conn, %{scopes: scopes} = options) do
	op = options[:op] \|\| :\|
	token = assigns[:token]

	cond do
	is_nil(token) ->
	conn

	op == :\| && scopes -- token.scopes != scopes ->
	conn

	op == :& && scopes -- token.scopes == [] ->
	conn

	options[:fallback] == :proceed_unauthenticated ->
	conn
	\|> assign(:user, nil)
	\|> assign(:token, nil)

	true ->
	missing_scopes = scopes -- token.scopes
	error_message = "Insufficient permissions: #{Enum.join(missing_scopes, " #{op} ")}."

	conn
	\|> put_resp_content_type("application/json")
	\|> send_resp(403, Jason.encode!(%{error: error_message}))
	\|> halt()
	end
	end
	end