Friday, May 24, 2013

Notification and confirm service using angular-ui bootstrap, phonegap and AngularJS

I've been playing with AngularJS lately when developing a new application using a Phonegap framework.

Phonegap is a framework which lets you create mobile apps for many platforms by just using HTML5 CSS and Javascript. These won't be as fast as native apps, but it makes developing faster.. I don't want to talk about Phonegap advantages and disadvantages here.

In my mobile applicatin I use alerts and confirmations windows many times.
Ripple - chrome extension that lets you emulate Phonegap someway doesn't provide confirmation windows (as far as I know) so I had to write my own fallback code for using native phonegap notifications on phone and html based notifications. For the second, I've used a great project angular-ui bootstrap which has a dialogs built in.

The code is a AngularJS service. I won't write here how AngularJS is great and awesome. Just look at the website and find yourself using this great framework. I think that Angular service is the right place to put this into work.

I should also mention  that I am using a great angular-phonegap-notification.

My intention was to make my service work similar to Phonegap notification API.

Wednesday, February 6, 2013

Restricting django to one user concurrent session only

Here's the tiny code that helps you avoid multiple users logged using the same account.
# -*- coding: utf-8 -*

from django.conf import settings
from django.core.cache import cache, get_cache
from django.utils.importlib import import_module

class UserRestrictMiddleware(object):
    def process_request(self, request):
        Checks if different session exists for user and deletes it.
        if request.user.is_authenticated():
            cache = get_cache('default')
            cache_timeout = 86400
            cache_key = "user_pk_%s_restrict" %
            cache_value = cache.get(cache_key)

            if cache_value is not None:
                if request.session.session_key != cache_value:
                    engine = import_module(settings.SESSION_ENGINE)
                    session = engine.SessionStore(session_key=cache_value)
                    cache.set(cache_key, request.session.session_key, 
                cache.set(cache_key, request.session.session_key, cache_timeout)

# vim: ai ts=4 sts=4 et sw=4
Hope you like it.
Remember, to put UserRestrictMiddleware somewhere after Session Middleware in MIDDLEWARE_CLASSES (