honkoma/lib/pleroma/plugs/rate_limit_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.RateLimitPlug do
import Phoenix.Controller, only: [json: 2]
import Plug.Conn
def init(opts), do: opts
def call(conn, opts) do
enabled? = Pleroma.Config.get([:app_account_creation, :enabled])
case check_rate(conn, Map.put(opts, :enabled, enabled?)) do
{:ok, _count} -> conn
{:error, _count} -> render_error(conn)
%Plug.Conn{} = conn -> conn
end
end
defp check_rate(conn, %{enabled: true} = opts) do
max_requests = opts[:max_requests]
bucket_name = conn.remote_ip |> Tuple.to_list() |> Enum.join(".")
ExRated.check_rate(bucket_name, opts[:interval] * 1000, max_requests)
end
defp check_rate(conn, _), do: conn
defp render_error(conn) do
conn
|> put_status(:forbidden)
|> json(%{error: "Rate limit exceeded."})
|> halt()
end
end