# frozen_string_literal: true require 'doorkeeper/grape/authorization_decorator' class Rack::Attack class Request def authenticated_token return @token if defined?(@token) @token = Doorkeeper::OAuth::Token.authenticate( Doorkeeper::Grape::AuthorizationDecorator.new(self), *Doorkeeper.configuration.access_token_methods ) end def remote_ip @remote_ip ||= (@env["action_dispatch.remote_ip"] || ip).to_s end def authenticated_user_id authenticated_token&.resource_owner_id end def unauthenticated? !authenticated_user_id end def api_request? path.start_with?('/api') end def web_request? !api_request? end def paging_request? params['page'].present? || params['min_id'].present? || params['max_id'].present? || params['since_id'].present? end end PROTECTED_PATHS = %w( /auth/sign_in /auth /auth/password ).freeze PROTECTED_PATHS_REGEX = Regexp.union(PROTECTED_PATHS.map { |path| /\A#{Regexp.escape(path)}/ }) # Always allow requests from localhost # (blocklist & throttles are skipped) Rack::Attack.safelist('allow from localhost') do |req| # Requests are allowed if the return value is truthy req.remote_ip == '127.0.0.1' || req.remote_ip == '::1' end throttle('throttle_authenticated_api', limit: 300, period: 5.minutes) do |req| req.authenticated_user_id if req.api_request? end throttle('throttle_unauthenticated_api', limit: 300, period: 5.minutes) do |req| req.remote_ip if req.api_request? && req.unauthenticated? end throttle('throttle_api_media', limit: 30, period: 30.minutes) do |req| req.authenticated_user_id if req.post? && req.path.start_with?('/api/v1/media') end throttle('throttle_media_proxy', limit: 30, period: 10.minutes) do |req| req.remote_ip if req.path.start_with?('/media_proxy') end throttle('throttle_api_sign_up', limit: 5, period: 30.minutes) do |req| req.remote_ip if req.post? && req.path == '/api/v1/accounts' end # Throttle paging, as it is mainly used for public pages and AP collections throttle('throttle_authenticated_paging', limit: 300, period: 15.minutes) do |req| req.authenticated_user_id if req.paging_request? end throttle('throttle_unauthenticated_paging', limit: 300, period: 15.minutes) do |req| req.remote_ip if req.paging_request? && req.unauthenticated? end API_DELETE_REBLOG_REGEX = /\A\/api\/v1\/statuses\/[\d]+\/unreblog/.freeze API_DELETE_STATUS_REGEX = /\A\/api\/v1\/statuses\/[\d]+/.freeze throttle('throttle_api_delete', limit: 30, period: 30.minutes) do |req| req.authenticated_user_id if (req.post? && req.path =~ API_DELETE_REBLOG_REGEX) || (req.delete? && req.path =~ API_DELETE_STATUS_REGEX) end throttle('protected_paths', limit: 25, period: 5.minutes) do |req| req.remote_ip if req.post? && req.path =~ PROTECTED_PATHS_REGEX end self.throttled_response = lambda do |env| now = Time.now.utc match_data = env['rack.attack.match_data'] headers = { 'Content-Type' => 'application/json', 'X-RateLimit-Limit' => match_data[:limit].to_s, 'X-RateLimit-Remaining' => '0', 'X-RateLimit-Reset' => (now + (match_data[:period] - now.to_i % match_data[:period])).iso8601(6), } [429, headers, [{ error: I18n.t('errors.429') }.to_json]] end end