discourse/lib/crawler_detection.rb

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module CrawlerDetection
def self.to_matcher(string, type: nil)
escaped = string.split('|').map { |agent| Regexp.escape(agent) }.join('|')
if type == :real && Rails.env == "test"
# we need this bypass so we properly render views
escaped << "|Rails Testing"
end
Regexp.new(escaped, Regexp::IGNORECASE)
end
def self.crawler?(user_agent)
return true if user_agent.nil?
# this is done to avoid regenerating regexes
@non_crawler_matchers ||= {}
@matchers ||= {}
possibly_real = (@non_crawler_matchers[SiteSetting.non_crawler_user_agents] ||= to_matcher(SiteSetting.non_crawler_user_agents, type: :real))
if user_agent.match?(possibly_real)
known_bots = (@matchers[SiteSetting.crawler_user_agents] ||= to_matcher(SiteSetting.crawler_user_agents))
user_agent.match?(known_bots)
else
true
end
end
end