Silently ignore bad cookies

parse_query_monkeypatch.rb

# Monkey-patch cookies method to not raise an error on a
# malformed cookie. This is because the utag cookie set by The Times
# can contain malformed unicode characters.

alert = "WARNING: You are monkey-patching Rack::Utils.parse_query to dump broken cookies. BE CAREFUL!"
puts alert
puts "*" * alert.length

module Rack

  module Utils
    def parse_query(qs, d = nil)
      params = {}

      max_key_space = Utils.key_space_limit
      bytes = 0

      (qs || '').split(d ? /[#{d}] */n : DEFAULT_SEP).each do |p|
        begin
          k, v = p.split('=', 2).map { |x| unescape(x) }
        rescue ArgumentError => e
          # Ignore invalid (key,value) pairs
          next if /^invalid %-encoding \(.*\)$/.match e.message
          # Reraise other errors
          raise
        end

        if k
          bytes += k.size
          if bytes > max_key_space
            raise RangeError, "exceeded available parameter key space"
          end
        end

        if cur = params[k]
          if cur.class == Array
            params[k] << v
          else
            params[k] = [cur, v]
          end
        else
          params[k] = v
        end
      end

      return params

    end

    module_function :parse_query

  end

end