# File lib/brakeman/checks/check_redirect.rb, line 243
  def safe_permit? exp
    if call? exp and params? exp.target and exp.method == :permit
      exp.each_arg do |opt|
        if symbol? opt and DANGEROUS_KEYS.include? opt.value
          return false 
        end
      end

      return true
    end

    false
  end