This is my attempt at creating dynamic filters for VCR.

vcr_filter.rb

class FilterProcessor
  
  #install in VCR config
  # VCR.config do |c|
    # FilterProcessor.new(config)
  # end
  def initialize(config)
    @filters = []
    config.before_record {|i| self.process_before_record(i) }
    config.before_playback {|i| self.process_before_playback(i) }    
  end
  
  def register(filter)
    @filters << filter
  end
  
  def process_before_record(i)
    filters.each do |f|
      begin
        f.before_record((i) if f.respond_to?(:before_record)
      rescue => e
      end
    end
  end

  def process_before_playback(i)
    filters.each do |f|
      begin
        f.before_playback(i) if f.respond_to?(:before_playback)
      rescue => e
      end
    end
  end
end

class StripCredentials
  def before_record(i)
    # strip credentials
  end
  
  def before_playback(i)
    # fill in credentials
  end

end