- # 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: 30.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
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