Synnefo

# Copyright 2011-2012 GRNET S.A. All rights reserved.

# 

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# without modification, are permitted provided that the following

# conditions are met:

# 

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

# 

#   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

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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import logging

import datetime

import time

from urllib import quote

from urlparse import urlsplit, urlunsplit, urlparse

from datetime import tzinfo, timedelta

from django.http import HttpResponse, HttpResponseBadRequest, urlencode

from django.template import RequestContext

from django.utils.translation import ugettext as _

from django.contrib.auth import authenticate

from django.core.urlresolvers import reverse

from django.core.exceptions import ValidationError

from astakos.im.models import AstakosUser, Invitation, ApprovalTerms

from astakos.im.settings import (

    INVITATIONS_PER_LEVEL, COOKIE_NAME, COOKIE_DOMAIN, COOKIE_SECURE,

    FORCE_PROFILE_UPDATE, LOGGING_LEVEL

)

from astakos.im.functions import login

logger = logging.getLogger(__name__)

class UTC(tzinfo):

   def utcoffset(self, dt):

       return timedelta(0)

   def tzname(self, dt):

       return 'UTC'

   def dst(self, dt):

       return timedelta(0)

def isoformat(d):

   """Return an ISO8601 date string that includes a timezone."""

   return d.replace(tzinfo=UTC()).isoformat()

def epoch(datetime):

    return int(time.mktime(datetime.timetuple())*1000)

def get_context(request, extra_context={}, **kwargs):

    if not extra_context:

        extra_context = {}

    extra_context.update(kwargs)

    return RequestContext(request, extra_context)

def get_invitation(request):

    """

    Returns the invitation identified by the ``code``.

    Raises ValueError if the invitation is consumed or there is another account

    associated with this email.

    """

    code = request.GET.get('code')

    if request.method == 'POST':

        code = request.POST.get('code')

    if not code:

        return

    invitation = Invitation.objects.get(code = code)

    if invitation.is_consumed:

        raise ValueError(_('Invitation is used'))

    if reserved_email(invitation.username):

        raise ValueError(_('Email: %s is reserved' % invitation.username))

    return invitation

def restrict_next(url, domain=None, allowed_schemes=()):

    """

    Return url if having the supplied ``domain`` (if present) or one of the ``allowed_schemes``.

    Otherwise return None.

    >>> print restrict_next('/im/feedback', '.okeanos.grnet.gr')

    /im/feedback

    >>> print restrict_next('pithos.okeanos.grnet.gr/im/feedback', '.okeanos.grnet.gr')

    //pithos.okeanos.grnet.gr/im/feedback

    >>> print restrict_next('https://pithos.okeanos.grnet.gr/im/feedback', '.okeanos.grnet.gr')

    https://pithos.okeanos.grnet.gr/im/feedback

    >>> print restrict_next('pithos://127.0.0,1', '.okeanos.grnet.gr')

    None

    >>> print restrict_next('pithos://127.0.0,1', '.okeanos.grnet.gr', allowed_schemes=('pithos'))

    pithos://127.0.0,1

    >>> print restrict_next('node1.example.com', '.okeanos.grnet.gr')

    None

    >>> print restrict_next('//node1.example.com', '.okeanos.grnet.gr')

    None

    >>> print restrict_next('https://node1.example.com', '.okeanos.grnet.gr')

    None

    >>> print restrict_next('https://node1.example.com')

    https://node1.example.com

    >>> print restrict_next('//node1.example.com')

    //node1.example.com

    >>> print restrict_next('node1.example.com')

    //node1.example.com

    """

    if not url:

        return

    parts = urlparse(url, scheme='http')

    if not parts.netloc and not parts.path.startswith('/'):

        # fix url if does not conforms RFC 1808

        url = '//%s' % url

        parts = urlparse(url, scheme='http')

    # TODO more scientific checks?

    if not parts.netloc:    # internal url

        return url

    elif not domain:

        return url

    elif parts.netloc.endswith(domain):

        return url

    elif parts.scheme in allowed_schemes:

        return url

def prepare_response(request, user, next='', renew=False):

    """Return the unique username and the token

       as 'X-Auth-User' and 'X-Auth-Token' headers,

       or redirect to the URL provided in 'next'

       with the 'user' and 'token' as parameters.

       Reissue the token even if it has not yet

       expired, if the 'renew' parameter is present

       or user has not a valid token.

    """

    renew = renew or (not user.auth_token)

    renew = renew or (user.auth_token_expires and user.auth_token_expires < datetime.datetime.now())

    if renew:

        user.renew_token()

        try:

            user.save()

        except ValidationError, e:

            return HttpResponseBadRequest(e) 

    next = restrict_next(next, domain=COOKIE_DOMAIN)

    if FORCE_PROFILE_UPDATE and not user.is_verified and not user.is_superuser:

        params = ''

        if next:

            params = '?' + urlencode({'next': next})

        next = reverse('astakos.im.views.edit_profile') + params

    response = HttpResponse()

    # authenticate before login

    user = authenticate(email=user.email, auth_token=user.auth_token)

    login(request, user)

    set_cookie(response, user)

    request.session.set_expiry(user.auth_token_expires)

    if not next:

        next = reverse('astakos.im.views.index')

    response['Location'] = next

    response.status_code = 302

    return response

def set_cookie(response, user):

    expire_fmt = user.auth_token_expires.strftime('%a, %d-%b-%Y %H:%M:%S %Z')

    cookie_value = quote(user.email + '|' + user.auth_token)

    response.set_cookie(COOKIE_NAME, value=cookie_value,

                        expires=expire_fmt, path='/',

                        domain=COOKIE_DOMAIN, secure=COOKIE_SECURE)

    msg = 'Cookie [expiring %s] set for %s' % (user.auth_token_expires, user.email)

    logger._log(LOGGING_LEVEL, msg, [])

class lazy_string(object):

    def __init__(self, function, *args, **kwargs):

        self.function=function

        self.args=args

        self.kwargs=kwargs

    def __str__(self):

        if not hasattr(self, 'str'):

            self.str=self.function(*self.args, **self.kwargs)

        return self.str

def reverse_lazy(*args, **kwargs):

    return lazy_string(reverse, *args, **kwargs)

def reserved_email(email):

    return AstakosUser.objects.filter(email = email).count() != 0

def get_query(request):

    try:

        return request.__getattribute__(request.method)

    except AttributeError:

        return {}