From: roob noob <lists@...>
Date: 2012-06-07T17:14:46+09:00
Subject: Re: how to store password?

def store_password
    @password = ""
    $stdin.sysread(512, @password)}
    @memwipe = Thread.new do
      Thread.stop #restart at end of operations that require password, 
to avoid password being wiped early
      sleep(@settings.password_store_minutes)
      wipe = StringIO.new("\0" * @password.bytesize)
      wipe.read(@password.bytesize, @password)
      $stdin.iflush #wipes keyboard buffer
      @password = nil
      Thread.exit
    end
  end

I might put this in my class that requires a password. Fortunately only 
one class really requires passwords, so I can just pass through the 
entire class with instance variables [hopefully this is an acceptable 
time to use instance variables]. I can have methods that start password 
store if @password == nil unless :no_password is passed [sometimes users 
may not use passwords]. And then at the end of the method they start the 
thread.

How can I integrate this with a GUI system though. When @password == nil 
the user should be prompted for their password with the GUI when 
store_password is called. But how can I determine @password value from 
the GUI, would this be an acceptable time to use instance_variable_get 
and poll that variable from the GUI? Also $stdin.sysread will work fine 
for the CLI interface but I am struggling to think of a way to send the 
password from the GUI to the store_password method.

Thanks!

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