Synnefo » astakos

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import hashlib

import uuid

import logging

from time import asctime

from datetime import datetime, timedelta

from base64 import b64encode

from urlparse import urlparse

from random import randint

from django.db import models

from django.contrib.auth.models import User, UserManager, Group

from astakos.im.settings import DEFAULT_USER_LEVEL, INVITATIONS_PER_LEVEL, AUTH_TOKEN_DURATION, BILLING_FIELDS, QUEUE_CONNECTION

from astakos.im.queue.userevent import UserEvent

from synnefo.lib.queue import exchange_connect, exchange_send, exchange_close, Receipt

QUEUE_CLIENT_ID = 3 # Astakos.

logger = logging.getLogger(__name__)

class AstakosUser(User):

    """

    Extends ``django.contrib.auth.models.User`` by defining additional fields.

    """

    # Use UserManager to get the create_user method, etc.

    objects = UserManager()

    affiliation = models.CharField('Affiliation', max_length=255, blank=True)

    provider = models.CharField('Provider', max_length=255, blank=True)

    #for invitations

    user_level = DEFAULT_USER_LEVEL

    level = models.IntegerField('Inviter level', default=user_level)

    invitations = models.IntegerField('Invitations left', default=INVITATIONS_PER_LEVEL.get(user_level, 0))

    auth_token = models.CharField('Authentication Token', max_length=32,

                                  null=True, blank=True)

    auth_token_created = models.DateTimeField('Token creation date', null=True)

    auth_token_expires = models.DateTimeField('Token expiration date', null=True)

    updated = models.DateTimeField('Update date')

    is_verified = models.BooleanField('Is verified?', default=False)

    # ex. screen_name for twitter, eppn for shibboleth

    third_party_identifier = models.CharField('Third-party identifier', max_length=255, null=True, blank=True)

    email_verified = models.BooleanField('Email verified?', default=False)

    has_credits = models.BooleanField('Has credits?', default=False)

    has_signed_terms = models.BooleanField('Agree with the terms?', default=False)

    date_signed_terms = models.DateTimeField('Signed terms date', null=True)

    __has_signed_terms = False

    __groupnames = []

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

        super(AstakosUser, self).__init__(*args, **kwargs)

        self.__has_signed_terms = self.has_signed_terms

        if self.id:

            self.__groupnames = [g.name for g in self.groups.all()]

        else:

            self.is_active = False

    @property

    def realname(self):

        return '%s %s' %(self.first_name, self.last_name)

    @realname.setter

    def realname(self, value):

        parts = value.split(' ')

        if len(parts) == 2:

            self.first_name = parts[0]

            self.last_name = parts[1]

        else:

            self.last_name = parts[0]

    @property

    def invitation(self):

        try:

            return Invitation.objects.get(username=self.email)

        except Invitation.DoesNotExist:

            return None

    def save(self, update_timestamps=True, **kwargs):

        if update_timestamps:

            if not self.id:

                self.date_joined = datetime.now()

            self.updated = datetime.now()

        # update date_signed_terms if necessary

        if self.__has_signed_terms != self.has_signed_terms:

            self.date_signed_terms = datetime.now()

        if not self.id:

            # set username

            while not self.username:

                username =  uuid.uuid4().hex[:30]

                try:

                    AstakosUser.objects.get(username = username)

                except AstakosUser.DoesNotExist, e:

                    self.username = username

            if not self.provider:

                self.provider = 'local'

        report_user_event(self)

        super(AstakosUser, self).save(**kwargs)

        # set group if does not exist

        groupname = 'shibboleth' if self.provider == 'shibboleth' else 'default'

        if groupname not in self.__groupnames:

            try:

                group = Group.objects.get(name = groupname)

                self.groups.add(group)

            except Group.DoesNotExist, e:

                logger.exception(e)

    def renew_token(self):

        md5 = hashlib.md5()

        md5.update(self.username)

        md5.update(self.realname.encode('ascii', 'ignore'))

        md5.update(asctime())

        self.auth_token = b64encode(md5.digest())

        self.auth_token_created = datetime.now()

        self.auth_token_expires = self.auth_token_created + \

                                  timedelta(hours=AUTH_TOKEN_DURATION)

    def __unicode__(self):

        return self.username

class ApprovalTerms(models.Model):

    """

    Model for approval terms

    """

    date = models.DateTimeField('Issue date', db_index=True, default=datetime.now())

    location = models.CharField('Terms location', max_length=255)

class Invitation(models.Model):

    """

    Model for registring invitations

    """

    inviter = models.ForeignKey(AstakosUser, related_name='invitations_sent',

                                null=True)

    realname = models.CharField('Real name', max_length=255)

    username = models.CharField('Unique ID', max_length=255, unique=True)

    code = models.BigIntegerField('Invitation code', db_index=True)

    #obsolete: we keep it just for transfering the data

    is_accepted = models.BooleanField('Accepted?', default=False)

    is_consumed = models.BooleanField('Consumed?', default=False)

    created = models.DateTimeField('Creation date', auto_now_add=True)

    #obsolete: we keep it just for transfering the data

    accepted = models.DateTimeField('Acceptance date', null=True, blank=True)

    consumed = models.DateTimeField('Consumption date', null=True, blank=True)

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

        super(Invitation, self).__init__(*args, **kwargs)

        if not self.id:

            self.code = _generate_invitation_code()

    def consume(self):

        self.is_consumed = True

        self.consumed = datetime.now()

        self.save()

    def __unicode__(self):

        return '%s -> %s [%d]' % (self.inviter, self.username, self.code)

def report_user_event(user):

    def should_send(user):

        # report event incase of new user instance

        # or if specific fields are modified

        if not user.id:

            return True

        db_instance = AstakosUser.objects.get(id = user.id)

        for f in BILLING_FIELDS:

            if (db_instance.__getattribute__(f) != user.__getattribute__(f)):

                return True

        return False

    if QUEUE_CONNECTION and should_send(user):

        eventType = 'create' if not user.id else 'modify'

        body = UserEvent(QUEUE_CLIENT_ID, user, eventType, {}).format()

        conn = exchange_connect(QUEUE_CONNECTION)

        parts = urlparse(QUEUE_CONNECTION)

        exchange = parts.path[1:]

        routing_key = '%s.user' % exchange

        exchange_send(conn, routing_key, body)

        exchange_close(conn)

def _generate_invitation_code():

    while True:

        code = randint(1, 2L**63 - 1)

        try:

            Invitation.objects.get(code=code)

            # An invitation with this code already exists, try again

        except Invitation.DoesNotExist:

            return code