Flowdock
v3.0.7 - Show latest stable - 2 notes - Superclass: Object

MessageVerifier makes it easy to generate and verify messages which are signed to prevent tampering.

This is useful for cases like remember-me tokens and auto-unsubscribe links where the session store isn’t suitable or available.

Remember Me: 

  cookies[:remember_me] = @verifier.generate([@user.id, 2.weeks.from_now])

In the authentication filter: 

  id, time = @verifier.verify(cookies[:remember_me])
  if time < Time.now
    self.current_user = User.find(id)
  end
Show files where this class is defined (1 file)
Register or log in to add new notes.
March 29, 2010
0 thanks

Wrong example

In the authentication filter example above, the time condition should be reversed: we only want to find the user if time is still in the future (because it’s the valid-until time).

So the example should look like this:

id, time = @verifier.verify(cookies[:remember_me])
if time > Time.now
  self.current_user = User.find(id)
end
August 14, 2011
0 thanks

Security issue

One thing to note about the code above is that it could have a security issue. If the user changes his/her password, the authentication token should expire. Hence, in a production scenario you should put in the password salt or something to allow the token to become invalidated.