mastodon/app/controllers/concerns/api/rate_limit_headers.rb

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# frozen_string_literal: true
module Api::RateLimitHeaders
extend ActiveSupport::Concern
class_methods do
def override_rate_limit_headers(method_name, options = {})
around_action(only: method_name, if: :current_account) do |_controller, block|
block.call
ensure
rate_limiter = RateLimiter.new(current_account, options)
rate_limit_headers = rate_limiter.to_headers
response.headers.merge!(rate_limit_headers) unless response.headers['X-RateLimit-Remaining'].present? && rate_limit_headers['X-RateLimit-Remaining'].to_i > response.headers['X-RateLimit-Remaining'].to_i
end
end
end
included do
before_action :set_rate_limit_headers, if: :rate_limited_request?
end
private
def set_rate_limit_headers
apply_header_limit
apply_header_remaining
apply_header_reset
end
def rate_limited_request?
!request.env['rack.attack.throttle_data'].nil?
end
def apply_header_limit
response.headers['X-RateLimit-Limit'] = rate_limit_limit
end
def rate_limit_limit
api_throttle_data[:limit].to_s
end
def apply_header_remaining
response.headers['X-RateLimit-Remaining'] = rate_limit_remaining
end
def rate_limit_remaining
(api_throttle_data[:limit] - api_throttle_data[:count]).to_s
end
def apply_header_reset
response.headers['X-RateLimit-Reset'] = rate_limit_reset
end
def rate_limit_reset
(request_time + reset_period_offset).iso8601(6)
end
def api_throttle_data
most_limited_type, = request.env['rack.attack.throttle_data'].min_by { |_key, value| value[:limit] - value[:count] }
request.env['rack.attack.throttle_data'][most_limited_type]
end
def request_time
@request_time ||= Time.now.utc
end
def reset_period_offset
api_throttle_data[:period] - (request_time.to_i % api_throttle_data[:period])
end
end