/usr/lib/ruby/vendor_ruby/rack/attack/cache.rb is in ruby-rack-attack 4.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | module Rack
class Attack
class Cache
attr_accessor :prefix
def initialize
self.store = ::Rails.cache if defined?(::Rails.cache)
@prefix = 'rack::attack'
end
attr_reader :store
def store=(store)
@store = StoreProxy.build(store)
end
def count(unprefixed_key, period)
key, expires_in = key_and_expiry(unprefixed_key, period)
do_count(key, expires_in)
end
def read(unprefixed_key)
store.read("#{prefix}:#{unprefixed_key}")
end
def write(unprefixed_key, value, expires_in)
store.write("#{prefix}:#{unprefixed_key}", value, :expires_in => expires_in)
end
def reset_count(unprefixed_key, period)
key, _ = key_and_expiry(unprefixed_key, period)
store.delete(key)
end
def delete(unprefixed_key)
store.delete("#{prefix}:#{unprefixed_key}")
end
private
def key_and_expiry(unprefixed_key, period)
epoch_time = Time.now.to_i
# Add 1 to expires_in to avoid timing error: http://git.io/i1PHXA
expires_in = (period - (epoch_time % period) + 1).to_i
["#{prefix}:#{(epoch_time / period).to_i}:#{unprefixed_key}", expires_in]
end
def do_count(key, expires_in)
result = store.increment(key, 1, :expires_in => expires_in)
# NB: Some stores return nil when incrementing uninitialized values
if result.nil?
store.write(key, 1, :expires_in => expires_in)
end
result || 1
end
end
end
end
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