Synnefo

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import hashlib

import uuid

from time import asctime

from datetime import datetime, timedelta

from base64 import b64encode

from django.db import models

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

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

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

QUEUE_CLIENT_ID = 3 # Astakos.

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[user_level])

    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)

    @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()

        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

            self.is_active = False

            if not self.provider:

                self.provider = 'local'

        report_user_event(self)

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

    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 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)

    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 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_EXCHANGE and should_send(user):

        l = [[elem, str(user.__getattribute__(elem))] for elem in BILLING_FIELDS]

        details = dict(l)

        details['eventType'] = 'create' if not user.id else 'modify'

        body = Receipt(QUEUE_CLIENT_ID, user.email, '', 0, details).format()

        conn = exchange_connect(QUEUE_EXCHANGE)

        routing_key = QUEUE_EXCHANGE.replace('#', body['id'])

        exchange_send(conn, routing_key, body)

        exchange_close(conn)