Re: [Phplib-users] Session Timeout - Tracking and showing message?

[Oliver Duke-W. <ol...@ge...>]

On Wed, Nov 07, 2001 at 12:14:37PM +0100, Sascha Ragtschaa wrote:
> Is it possible to track, when a user has lost its session and therefore
> showing a error message like "your session has expired...". Is that possible
> with PHPlib? Does anyone have experience with such thing?

I've done that in the following manner:

i)

The function unauth() in whichever auth class you use is overridden or
modified like this:

  function unauth($nobody = false) {

    /*
     * Add flag indicating whether session has expired
     */
  

    if ($this->lifetime > 0 && 
       ((isset($this->auth["exp"]) && $this->auth["exp"])
       && (time() > $this->auth["exp"]))) {
      $this->auth["expired"] = true;
    } else {
      $this->auth["expired"] = false;
    }

    $this->auth["uid"]   = "";
    $this->auth["perm"]  = "";
    $this->auth["exp"]   = 0;

    ## Back compatibility: passing $nobody to this method is
    ## deprecated
    if ($nobody) {
      $this->auth["uid"]   = "nobody";
      $this->auth["perm"]  = "";
      $this->auth["exp"]   = 0x7fffffff;
    }
  }

Secondly, the function auth_loginform() can now use the flag set up above.
The rest of the function will depend on what sort of auth class you use:

  function auth_loginform() {

    ...

    if (isset($this->auth["expired"]) && $this->auth['expired']) {
 
      /*
       * form to be used for sessions that have expired
       */

      include($_PHPLIB["libdir"] . "crloginform_exp.html");
    } else {


      /*
       * form to be used for new logins
       */

      include($_PHPLIB["libdir"] . "crloginform.html");
    }
    return;
  }


Thus, both users starting a new session and users trying to load a page in a
session that has expired will be forced to login, but you can use an
alternative page for expired sessions that gives more appropriate
instructions. 

Cheers,

Oliver

-- 
Oliver Duke-Williams  <ol...@ge...>   Tel 0113 233 3286
Centre for Computational Geography, University of Leeds, UK