88 lines
2.5 KiB
Elixir
88 lines
2.5 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Plugs.RateLimiter do
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@moduledoc """
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## Configuration
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A keyword list of rate limiters where a key is a limiter name and value is the limiter configuration. The basic configuration is a tuple where:
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* The first element: `scale` (Integer). The time scale in milliseconds.
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* The second element: `limit` (Integer). How many requests to limit in the time scale provided.
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It is also possible to have different limits for unauthenticated and authenticated users: the keyword value must be a list of two tuples where the first one is a config for unauthenticated users and the second one is for authenticated.
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### Example
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config :pleroma, :rate_limit,
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one: {1000, 10},
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two: [{10_000, 10}, {10_000, 50}]
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Here we have two limiters: `one` which is not over 10req/1s and `two` which has two limits 10req/10s for unauthenticated users and 50req/10s for authenticated users.
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## Usage
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Inside a controller:
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plug(Pleroma.Plugs.RateLimiter, :one when action == :one)
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plug(Pleroma.Plugs.RateLimiter, :two when action in [:two, :three])
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or inside a router pipiline:
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pipeline :api do
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...
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plug(Pleroma.Plugs.RateLimiter, :one)
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...
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end
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"""
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import Phoenix.Controller, only: [json: 2]
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import Plug.Conn
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alias Pleroma.User
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def init(limiter_name) do
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case Pleroma.Config.get([:rate_limit, limiter_name]) do
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nil -> nil
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config -> {limiter_name, config}
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end
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end
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# do not limit if there is no limiter configuration
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def call(conn, nil), do: conn
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def call(conn, opts) do
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case check_rate(conn, opts) do
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{:ok, _count} -> conn
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{:error, _count} -> render_error(conn)
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end
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end
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defp check_rate(%{assigns: %{user: %User{id: user_id}}}, {limiter_name, [_, {scale, limit}]}) do
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ExRated.check_rate("#{limiter_name}:#{user_id}", scale, limit)
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end
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defp check_rate(conn, {limiter_name, [{scale, limit} | _]}) do
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ExRated.check_rate("#{limiter_name}:#{ip(conn)}", scale, limit)
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end
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defp check_rate(conn, {limiter_name, {scale, limit}}) do
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check_rate(conn, {limiter_name, [{scale, limit}]})
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end
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def ip(%{remote_ip: remote_ip}) do
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remote_ip
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|> Tuple.to_list()
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|> Enum.join(".")
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end
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defp render_error(conn) do
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conn
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|> put_status(:too_many_requests)
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|> json(%{error: "Throttled"})
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|> halt()
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end
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end
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