import syslog, base64

from django.contrib.auth import *
from django.contrib.auth.models import User
from django.db import IntegrityError
from django.http import HttpResponseRedirect

class BasicAuthenticationMiddleware(object):

    def process_request(self, request):

        try:
            user = getattr(request, 'user')
            redirect_to = request.REQUEST.get('next', '')

            headername = 'HTTP_AUTHORIZATION'

            if (user is None or not user.is_authenticated()) \
                   and headername in request.META:
                auth = request.META[headername]
                auth = auth.split(' ')

                authdecode = base64.b64decode(auth[1])
                (username, password) = authdecode.split(':')

                user = authenticate(username = username, password = password)

                if user is not None and user.is_authenticated() and user.is_active:
                    login(request, user)
                else:
                    if user is None:
                        # Create new user with some defaults.
                        #~ user = User(username=username, email='%s@noreply.com'%username)
                        user = User(username=username)
                        user.set_password(password)
                        user.is_active = True
                        user.first_name = u''
                        user.last_name = u''
                        user.email = u''

                        try:
                            # Save the user into the DB.
                            user.save()

                            # Now automatically log the user in.
                            #~ if user is not None and user.is_authenticated() and user.is_active:
                            if user is not None:
                                pass
                                # Try to log the user in.
                                #~ syslog.syslog("Logging user %s in automatically" % user.username)
                                #~ login(request, user)
                                return HttpResponseRedirect(redirect_to)

                        except IntegrityError, e:
                            # Likely the username already exists.
                            syslog.syslog(str(e))

        except AttributeError, e:
            syslog.syslog(str(e))

        return None