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# Author: limodou@gmail.com # version: 0.1 # Url filter middleware # Update: # 0.1 from django.conf import settings from utils.common import get_func import re class FilterMiddleware(object): def process_request(self, request): filter_items = getattr(settings, 'FILTERS', ()) for v in filter_items: r, func = v if not isinstance(r, (list, tuple)): r = [r] for p in r: if isinstance(p, (str, unicode)): p = re.compile(p) m = p.match(request.path[1:]) if m: kwargs = m.groupdict() if kwargs: args = () else: args = m.groups() return get_func(func)(request, *args, **kwargs)

How to config it

You can treat it as a micro url filter framework. Before you using it, you should setup some options about it. The option entry shoud be like this:

FILTERS = (
    (r'^user/(?P<user_id>\d+)/', 'apps.users.filter.check_valid_user'),
)

FILTERS should be a list or tuple with two elements tuple item. The format should be like:

(url_patterns, function)

And url_patterns could be a single regex expression or a list/tuple regex expressions, So you can set multi regex expression in it. And the regulation is just like url dispatch, as above example, the url pattern is:

r'^user/(?P<user_id>\d+)/'

So you can see, you can set parameter name user_id, then it'll be passed to the function behind.

Function can be a string format, just like above example, and it can be also a real function object.

It'll only impact request.

How to write filter function

According above example, I define a url pattern, and what to check if the user is a valid user, and if the user is visiting his own urls, so the filter function could be:

from django.contrib.auth.models import User
from utils.common import render_template

def check_valid_user(request, user_id):
    if request.user.is_anonymous():
        return render_template(request, 'users/user_login.html', {'next':'%s' % request.path})
    try:
        person = User.objects.get(pk=int(user_id))
    except User.DoesNotExist:
        return render_template(request, 'error.html', {'message':_("User ID (%s) is not existed!") % user_id})
    if person.id != request.user.id:
        return render_template(request, 'error.html', {'message':_('You have no right to view the page!')})

I think the code is very clear.

And you can use it filtermiddleware to do like user authentication check, and other checking for url.

BTW, render_template is comes from Snippets #4

Author:

limodou

Posted:

March 3, 2007

Language:

Python

Django Version:

Pre .96

Tags:

middleware filter url

Score:

2 (after 4 ratings)

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