[development] Rules action to impersonate a user

Tue Jan 22 14:00:38 UTC 2013

Ok.

Till now I have created a pair of actions; one which I call at the start of
my rule to impersonate "node changing user", and one at last to change
back. Using this I can call scheduled rules with the user who triggered
them. It is all I need to the moment, so I will stop looking further into
batching actions (limited time).

Thanks.

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

> drupal_static() is not equivalent to PHP static.  The example you've
> given is using PHP static and yes, it will not be available in another
> function.
>
>
> http://api.drupal.org/api/drupal/includes%21bootstrap.inc/function/drupal_static/7
>
> On Mon, Jan 21, 2013 at 11:21 AM, Lluís Forns <enboig at gmail.com> wrote:
> > 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.
>
>
>
> --
> 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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