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# frozen_string_literal: true
# Include this in your controller and call `limit_pages` in order
# to configure the limiter.
#
# Examples:
# class MyController < ApplicationController
# include PageLimiter
#
# before_action only: [:index] do
# limit_pages(500)
# end
#
# # You can override the default response
# rescue_from PageOutOfBoundsError, with: :page_out_of_bounds
#
# def page_out_of_bounds(error)
# # Page limit number is available as error.message
# head :ok
# end
#
module PageLimiter
extend ActiveSupport::Concern
PageLimiterError = Class.new(StandardError)
PageLimitNotANumberError = Class.new(PageLimiterError)
PageLimitNotSensibleError = Class.new(PageLimiterError)
PageOutOfBoundsError = Class.new(PageLimiterError)
included do
rescue_from PageOutOfBoundsError, with: :default_page_out_of_bounds_response
end
def limit_pages(max_page_number)
check_page_number!(max_page_number)
end
private
# If the page exceeds the defined maximum, raise a PageOutOfBoundsError
# If the page doesn't exceed the limit, it does nothing.
def check_page_number!(max_page_number)
raise PageLimitNotANumberError unless max_page_number.is_a?(Integer)
raise PageLimitNotSensibleError unless max_page_number > 0
if params[:page].present? && params[:page].to_i > max_page_number
record_page_limit_interception
raise PageOutOfBoundsError, max_page_number
end
end
# By default just return a HTTP status code and an empty response
def default_page_out_of_bounds_response
head :bad_request
end
# Record the page limit being hit in Prometheus
def record_page_limit_interception
dd = DeviceDetector.new(request.user_agent)
Gitlab::Metrics.counter(:gitlab_page_out_of_bounds,
controller: params[:controller],
action: params[:action],
bot: dd.bot?
).increment
end
end
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