intercepting login & logout events

[Vlad]

What would be the simplest way to intercept login and logout? 

(i.e. I'd like to perform some additional tasks when a user is logged in, and when a user is logged out.)

web2py elegantly hides the functionality in default.user under form=auth() and {{=form}} and somehow I can't think of a simple way to be notified about successful login and logout actions... 

[Yoel Benitez Fonseca]

I think you can do it in the default/user function. Having in account that the call to auth() probably raises a HTTP exceptiong in case of a success. This example is only a proof of concept:

def user():
    form = CAT()
    
    try:
        form = auth()
    except HTTP as e:
        if e.status == 303'login' in request.args:
            if ('login' in request.args) and auth.user:
                # probably a success, u can test if auth.user is o not None
                do_your_loging_event_here() 
            elif 'logout' if request.args:
                do_your_logout_event_here()
    
    return dict(form=form)

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Msc. Yoel Benítez Fonseca

[Yoel Benitez Fonseca]

Got a syntax error there, sorry:

El lunes, 17 de junio de 2019, 9:44:10 (UTC-4), Yoel Benitez Fonseca escribió:

I think you can do it in the default/user function. Having in account that the call to auth() probably raises a HTTP exceptiong in case of a success. This example is only a proof of concept:

def user():
    form = CAT()
    
    try:
        form = auth()
    except HTTP as e:

        if e.status == 303:

[Vlad]

but isn't such a scenario catching a user in a process of logging in or logging out, but before actual login/logout?

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[Yoel Benitez Fonseca]

no, it is not.

The first time the default/user is called - in the login process for example - there not a HTTP(303) (redirect) exception, and the user get the form.

The second time, in this scenery, the call to auth() will cause a redirect (HTTP exception) and the user is effectively logged into the system.

The same goes for the logout, but there is not a form in the middle.

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[Vlad]

Yoel, where could I look up how this works about the exception 303? Because I don't understand that part at all - I am not aware of exception being raised, why, and how it works in the flow - could you please point me to the direction where it's explained? 

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[Yoel Benitez Fonseca]

Vlad, in the book:

http://www.web2py.com/books/default/chapter/29/04/the-core#HTTP-and-redirect

And i can comment out +/- the code:

def user():

    # just a way to ensure form allways have a value
    form = CAT()
    
    try:

        # the call to auth can return a lot of things

        # it can be a form (a login form for example or a registration form)

        # it can raise a redirect - for exple if the login is correct

        # it can be the login form with erros if the password is incorrect

        # etc
        form = auth()

    except HTTP as e:
        if e.status == 303'login' in request.args:
            if ('login' in request.args) and auth.user:

                # probably a success, the user has logged in
                do_your_loging_event_here() 

                # ensuere u do the redirect, for example a raise shoul do it
            

elif 'logout' if request.args:
                do_your_logout_event_here()
    

    # give the form to the view, can be register form, login form, etc
    return dict(form=form)

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[Vlad]

thank you ! 

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[Annet]

Web2py has auth.settings I used them to solve your problem

auth.settings.login_onaccept = lambda form: __on_login()
auth.settings.logout_onlogout = lambda user: __on_logout()

and then in the functions the task you want to perform, in my case

some set up things and messages, something like:

def __on_login():
    # set up code

    # messages

    if auth.user.first_name:
        name = auth.user.first_name + ' '
    elif auth.user.title:
        name = auth.user.title + ' '
    if auth.user.familyNamePreposition:
        name += auth.user.familyNamePreposition + ' '
    name += auth.user.last_name

    session.messages_logged_out = 'You have successfully logged out, goodbye %s' %(name)
    session.flash =  'You have successfully logged in, welcome %s' %(name)

    return None


def __on_logout():
    if session.forced_logout:
        auth.messages.logged_out = session.forced_logged_out_message
    else:
        auth.messages.logged_out = session.messages_logged_out

    return None

Kind regards,

Annet

[Eliezer (Vlad) Tseytkin]

This is perfect,

I missed it,

Thank you!!

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Resources:
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- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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[Yoel Benitez Fonseca]

missed that one