Synnefo

# Copyright 2011 GRNET S.A. All rights reserved.

# 

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# without modification, are permitted provided that the following

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#      disclaimer.

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#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

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from traceback import format_exc

from time import time, mktime

from django.conf import settings

from django.http import HttpResponse

from django.utils import simplejson as json

from astakos.im.faults import BadRequest, Unauthorized, ServiceUnavailable

from astakos.im.models import AstakosUser

import datetime

def render_fault(request, fault):

    if settings.DEBUG or settings.TEST:

        fault.details = format_exc(fault)

    request.serialization = 'text'

    data = '\n'.join((fault.message, fault.details)) + '\n'

    response = HttpResponse(data, status=fault.code)

    return response

def update_response_headers(response):

    response['Content-Type'] = 'application/json; charset=UTF-8'

    response['Content-Length'] = len(response.content)

def authenticate(request):

    # Normal Response Codes: 204

    # Error Response Codes: serviceUnavailable (503)

    #                       badRequest (400)

    #                       unauthorised (401)

    try:

        if request.method != 'GET':

            raise BadRequest('Method not allowed.')

        x_auth_token = request.META.get('HTTP_X_AUTH_TOKEN')

        if not x_auth_token:

            return render_fault(request, BadRequest('Missing X-Auth-Token'))

        try:

            user = AstakosUser.objects.get(auth_token=x_auth_token)

        except AstakosUser.DoesNotExist, e:

            return render_fault(request, Unauthorized('Invalid X-Auth-Token')) 

        # Check if the is active.

        if not user.is_active:

            return render_fault(request, Unauthorized('User inactive'))

        # Check if the token has expired.

        if (time() - mktime(user.auth_token_expires.timetuple())) > 0:

            return render_fault(request, Unauthorized('Authentication expired'))

        response = HttpResponse()

        response.status=204

        user_info = {'uniq':user.username,

                     'auth_token':user.auth_token,

                     'auth_token_created':user.auth_token_created,

                     'auth_token_expires':user.auth_token_expires}

        response.content = json.dumps(user_info)

        update_response_headers(response)

        return response

    except BaseException, e:

        fault = ServiceUnavailable('Unexpected error')

        return render_fault(request, fault)