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