[development] Rules action to impersonate a user

[Lluís Forns]

I know we are going OT, but I also want to understand this;

what about:

function mymodule_complex_calculation() {
  static $cache;
  if (isset($cache)) {
    return $cache;
  }
  // Otherwise we need to perform our calculations
  // ...some complex calculation that returns
  $cache = complex_calculation();
  return $cache;}


http://techblog.zabuchy.net/2011/enhancing-drupal-performance-with-drupal_static/

You are saying that if I instantiate a variable in "mymodule_impersonate()"
it will not be available in "mymodule_unimpersonate()"?


2013/1/21 Earnie Boyd <earnie at users.sourceforge.net>

> You "think" wrongly.  A static variable has local scope to the
> function declaring the static variable.
>
> On Mon, Jan 21, 2013 at 11:03 AM, Lluís Forns <enboig at gmail.com> wrote:
> > I think static are also available to other functions, use them to store
> > cached information across my code and they work.
> >
> >
> > 2013/1/21 Darren Oh <darrenoh at sidepotsinternational.com>
> >>
> >> Static variables are only saved for a single function. Global variables
> >> are available to all functions during a single page request. Session
> >> variables are available to all page requests during a session.
> >>
> >> On Jan 21, 2013, at 10:08 AM, Lluís Forns wrote:
> >>
> >> Darren, thanks for the link. What is the difference between using global
> >> or static to save the data?
> >>
> >>
> >>
> >> 2013/1/21 Lluís Forns <enboig at gmail.com>
> >>>
> >>> My code was from a module where impersonation recursively could happen,
> >>> this is why I use a stack to save user state. I am also saving it to
> session
> >>> and not using a static variable because I may uses batch functions.
> >>>
> >>> But I see some problems right now:
> >>> - To be safe impersonation should be saved into static variables (and
> >>> "using session_save_session(FALSE);" ), so if anything goes wrong,
> $user is
> >>> not afected.
> >>> - If I want to be able to execute every Rules action in a batch, I need
> >>> to change user "per action"
> >>>
> >>> Any idea of how to "inject" code before and after a rule action?
> >>>
> >>>
> >>> 2013/1/21 Walt Daniels <wdlists at gmail.com>
> >>>>
> >>>> We do the latter simple trick in our store code so we can show people
> >>>> the member prices. We have a dummy id that is a member so we switch
> to it,
> >>>> pick up the price and use it so we can show both member and non-member
> >>>> prices on the screen.
> >>>>
> >>>>
> >>>> On Mon, Jan 21, 2013 at 9:18 AM, Christian López Espínola
> >>>> <penyaskito at computer.org> wrote:
> >>>>>
> >>>>> Haven't tested your code, but maybe you want to take a look at
> >>>>> masquerade_switch_user and masquerade_switch_back:
> >>>>>
> http://drupalcode.org/project/masquerade.git/blob/HEAD:/masquerade.module.
> >>>>>
> >>>>> And if the impersonation is only for the given request, maybe just
> >>>>>
> >>>>>  global $user;
> >>>>>  $previous = $user;
> >>>>>  $user = user_load($uid);
> >>>>> // Do your stuff.
> >>>>>  $user = $previous;
> >>>>>
> >>>>> would work.
> >>>>>
> >>>>>
> >>>>>
> >>>>> On Mon, Jan 21, 2013 at 10:37 AM, Lluís Forns <enboig at gmail.com>
> wrote:
> >>>>>>
> >>>>>> Some of my scheduled task needs to run as the user who triggered
> them
> >>>>>> (not anonymous neither admin); so I thought of writing two actions:
> >>>>>> - One to impersonate a user, which will receive uid as an argument.
> >>>>>> - Another to undo the impersonate.
> >>>>>> All the called actions should be between them.
> >>>>>>
> >>>>>> Anybody see any fault in this idea or the actions code?
> >>>>>>
> >>>>>> Thanks.
> >>>>>>
> >>>>>> function wu_action_impersonate($uid) {
> >>>>>>   global $user;
> >>>>>>   if (!array_key_exists('wu_action_impersonate', $_SESSION)) {
> >>>>>>     $_SESSION['wu_action_impersonate'] = array();
> >>>>>>   }
> >>>>>>   array_push($_SESSION['wu_action_impersonate'], $user);
> >>>>>>   session_save_session(FALSE);
> >>>>>>   $user = user_load($uid);
> >>>>>>   user_load($uid);
> >>>>>> }
> >>>>>>
> >>>>>> function wu_action_unimpersonate() {
> >>>>>>   global $user;
> >>>>>>   if (array_key_exists('wu_action_impersonate', $_SESSION)) {
> >>>>>>     if (!empty($_SESSION['wu_action_impersonate'])) {
> >>>>>>       $user = array_pop($_SESSION['wu_action_impersonate']);
> >>>>>>     }
> >>>>>>     if (empty($_SESSION['wu_action_impersonate'])) {
> >>>>>>       unset($_SESSION['wu_action_impersonate']);
> >>>>>>     }
> >>>>>>   }
> >>>>>>   session_save_session(TRUE);
> >>>>>> }
> >>>>>>
> >>>>>> --
> >>>>>> *Ser freak no és imprescindible per ser informàtic, però ajuda.
> >>>>>> *La vida no ha de ser feliç, ha de ser plena.
> >>>>>> *Abans d'imprimir aquest missatge, pensa en el medi ambient.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> --
> >>>>> Cheers,
> >>>>>
> >>>>> Christian López Espínola <penyaskito AT computer DOT org>
> >>>>> http://twitter.com/penyaskito | http://penyaskito.com
> >>>>
> >>>>
> >>>
> >>>
> >>>
> >>> --
> >>> *Ser freak no és imprescindible per ser informàtic, però ajuda.
> >>> *La vida no ha de ser feliç, ha de ser plena.
> >>> *Abans d'imprimir aquest missatge, pensa en el medi ambient.
> >>
> >>
> >>
> >>
> >> --
> >> *Ser freak no és imprescindible per ser informàtic, però ajuda.
> >> *La vida no ha de ser feliç, ha de ser plena.
> >> *Abans d'imprimir aquest missatge, pensa en el medi ambient.
> >>
> >>
> >
> >
> >
> > --
> > *Ser freak no és imprescindible per ser informàtic, però ajuda.
> > *La vida no ha de ser feliç, ha de ser plena.
> > *Abans d'imprimir aquest missatge, pensa en el medi ambient.
>
>
>
> --
> Earnie
> -- https://sites.google.com/site/earnieboyd
>



-- 
*Ser freak no és imprescindible per ser informàtic, però ajuda.
*La vida no ha de ser feliç, ha de ser plena.
*Abans d'imprimir aquest missatge, pensa en el medi ambient.
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