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49 lines
1.8 KiB
Ruby
49 lines
1.8 KiB
Ruby
# frozen_string_literal: true
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module CacheConcern
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extend ActiveSupport::Concern
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class_methods do
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def vary_by(value, **kwargs)
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before_action(**kwargs) do |controller|
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response.headers['Vary'] = value.respond_to?(:call) ? controller.instance_exec(&value) : value
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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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after_action :enforce_cache_control!
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end
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# Prevents high-entropy headers such as `Cookie`, `Signature` or `Authorization`
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# from being used as cache keys, while allowing to `Vary` on them (to not serve
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# anonymous cached data to authenticated requests when authentication matters)
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def enforce_cache_control!
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vary = response.headers['Vary']&.split&.map { |x| x.strip.downcase }
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return unless vary.present? && %w(cookie authorization signature).any? { |header| vary.include?(header) && request.headers[header].present? }
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response.cache_control.replace(private: true, no_store: true)
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end
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def render_with_cache(**options)
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raise ArgumentError, 'Only JSON render calls are supported' unless options.key?(:json) || block_given?
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key = options.delete(:key) || [[params[:controller], params[:action]].join('/'), options[:json].respond_to?(:cache_key) ? options[:json].cache_key : nil, options[:fields].nil? ? nil : options[:fields].join(',')].compact.join(':')
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expires_in = options.delete(:expires_in) || 3.minutes
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body = Rails.cache.read(key, raw: true)
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if body
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render(options.except(:json, :serializer, :each_serializer, :adapter, :fields).merge(json: body))
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else
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if block_given?
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options[:json] = yield
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elsif options[:json].is_a?(Symbol)
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options[:json] = send(options[:json])
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end
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render(options)
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Rails.cache.write(key, response.body, expires_in: expires_in, raw: true)
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end
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end
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end
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