mirror of
https://akkoma.dev/AkkomaGang/akkoma.git
synced 2024-11-23 15:05:45 +00:00
93 lines
2.6 KiB
Elixir
93 lines
2.6 KiB
Elixir
# Pleroma: A lightweight social networking server
|
|
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
|
|
# SPDX-License-Identifier: AGPL-3.0-only
|
|
|
|
defmodule Pleroma.Plugs.RateLimiter do
|
|
@moduledoc """
|
|
|
|
## Configuration
|
|
|
|
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:
|
|
|
|
* The first element: `scale` (Integer). The time scale in milliseconds.
|
|
* The second element: `limit` (Integer). How many requests to limit in the time scale provided.
|
|
|
|
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.
|
|
|
|
To disable a limiter set its value to `nil`.
|
|
|
|
### Example
|
|
|
|
config :pleroma, :rate_limit,
|
|
one: {1000, 10},
|
|
two: [{10_000, 10}, {10_000, 50}],
|
|
foobar: nil
|
|
|
|
Here we have three limiters:
|
|
|
|
* `one` which is not over 10req/1s
|
|
* `two` which has two limits: 10req/10s for unauthenticated users and 50req/10s for authenticated users
|
|
* `foobar` which is disabled
|
|
|
|
## Usage
|
|
|
|
Inside a controller:
|
|
|
|
plug(Pleroma.Plugs.RateLimiter, :one when action == :one)
|
|
plug(Pleroma.Plugs.RateLimiter, :two when action in [:two, :three])
|
|
|
|
or inside a router pipiline:
|
|
|
|
pipeline :api do
|
|
...
|
|
plug(Pleroma.Plugs.RateLimiter, :one)
|
|
...
|
|
end
|
|
"""
|
|
import Pleroma.Web.TranslationHelpers
|
|
import Plug.Conn
|
|
|
|
alias Pleroma.User
|
|
|
|
def init(limiter_name) do
|
|
case Pleroma.Config.get([:rate_limit, limiter_name]) do
|
|
nil -> nil
|
|
config -> {limiter_name, config}
|
|
end
|
|
end
|
|
|
|
# do not limit if there is no limiter configuration
|
|
def call(conn, nil), do: conn
|
|
|
|
def call(conn, opts) do
|
|
case check_rate(conn, opts) do
|
|
{:ok, _count} -> conn
|
|
{:error, _count} -> render_throttled_error(conn)
|
|
end
|
|
end
|
|
|
|
defp check_rate(%{assigns: %{user: %User{id: user_id}}}, {limiter_name, [_, {scale, limit}]}) do
|
|
ExRated.check_rate("#{limiter_name}:#{user_id}", scale, limit)
|
|
end
|
|
|
|
defp check_rate(conn, {limiter_name, [{scale, limit} | _]}) do
|
|
ExRated.check_rate("#{limiter_name}:#{ip(conn)}", scale, limit)
|
|
end
|
|
|
|
defp check_rate(conn, {limiter_name, {scale, limit}}) do
|
|
check_rate(conn, {limiter_name, [{scale, limit}]})
|
|
end
|
|
|
|
def ip(%{remote_ip: remote_ip}) do
|
|
remote_ip
|
|
|> Tuple.to_list()
|
|
|> Enum.join(".")
|
|
end
|
|
|
|
defp render_throttled_error(conn) do
|
|
conn
|
|
|> render_error(:too_many_requests, "Throttled")
|
|
|> halt()
|
|
end
|
|
end
|