Synnefo » astakos

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

#

# Redistribution and use in source and binary forms, with or

# 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.

#

# 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,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

import json

import logging

import socket

import csv

import sys

from datetime import datetime

from functools import wraps

from math import ceil

from random import randint

from smtplib import SMTPException

from hashlib import new as newhasher

from urllib import quote

from django.conf import settings

from django.core.mail import send_mail

from django.http import HttpResponse, HttpResponseRedirect, HttpResponseBadRequest

from django.shortcuts import redirect

from django.template.loader import render_to_string

from django.shortcuts import render_to_response

from django.utils.http import urlencode

from django.utils.translation import ugettext as _

from django.core.urlresolvers import reverse

from django.contrib.auth.models import AnonymousUser

from django.contrib.auth.decorators import login_required

from django.contrib.sites.models import Site

from django.contrib import messages

from django.db import transaction

from django.contrib.auth.forms import UserCreationForm

from astakos.im.models import AstakosUser, Invitation

from astakos.im.backends import get_backend

from astakos.im.util import get_context, get_current_site, get_invitation

from astakos.im.forms import *

def render_response(template, tab=None, status=200, context_instance=None, **kwargs):

    """

    Calls ``django.template.loader.render_to_string`` with an additional ``tab``

    keyword argument and returns an ``django.http.HttpResponse`` with the

    specified ``status``.

    """

    if tab is None:

        tab = template.partition('_')[0].partition('.html')[0]

    kwargs.setdefault('tab', tab)

    html = render_to_string(template, kwargs, context_instance=context_instance)

    return HttpResponse(html, status=status)

def index(request, login_template_name='login.html', profile_template_name='profile.html', extra_context={}):

    """

    If there is logged on user renders the profile page otherwise renders login page.

    **Arguments**

    ``login_template_name``

        A custom login template to use. This is optional; if not specified,

        this will default to ``login.html``.

    ``profile_template_name``

        A custom profile template to use. This is optional; if not specified,

        this will default to ``profile.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

    profile.html or login.html or ``template_name`` keyword argument.

    """

    template_name = login_template_name

    formclass = 'LoginForm'

    kwargs = {}

    if request.user.is_authenticated():

        template_name = profile_template_name

        formclass = 'ProfileForm'

        kwargs.update({'instance':request.user})

    return render_response(template_name,

                           form = globals()[formclass](**kwargs),

                           context_instance = get_context(request, extra_context))

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

def _send_invitation(request, baseurl, inv):

    sitename, sitedomain = get_current_site(request, use_https=request.is_secure())

    subject = _('Invitation to %s' % sitename)

    url = settings.SIGNUP_TARGET % (baseurl, inv.code, quote(sitedomain))

    message = render_to_string('invitation.txt', {

                'invitation': inv,

                'url': url,

                'baseurl': baseurl,

                'service': sitename,

                'support': settings.DEFAULT_CONTACT_EMAIL % sitename.lower()})

    sender = settings.DEFAULT_FROM_EMAIL % sitename

    send_mail(subject, message, sender, [inv.username])

    logging.info('Sent invitation %s', inv)

@login_required

@transaction.commit_manually

def invite(request, template_name='invitations.html', extra_context={}):

    """

    Allows a user to invite somebody else.

    In case of GET request renders a form for providing the invitee information.

    In case of POST checks whether the user has not run out of invitations and then

    sends an invitation email to singup to the service.

    The view uses commit_manually decorator in order to ensure the number of the

    user invitations is going to be updated only if the email has been successfully sent.

    If the user isn't logged in, redirects to settings.LOGIN_URL.

    **Arguments**

    ``template_name``

        A custom template to use. This is optional; if not specified,

        this will default to ``invitations.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

    invitations.html or ``template_name`` keyword argument.

    **Settings:**

    The view expectes the following settings are defined:

    * LOGIN_URL: login uri

    * SIGNUP_TARGET: Where users should signup with their invitation code

    * DEFAULT_CONTACT_EMAIL: service support email

    * DEFAULT_FROM_EMAIL: from email

    """

    status = None

    message = None

    inviter = AstakosUser.objects.get(username = request.user.username)

    if request.method == 'POST':

        username = request.POST.get('uniq')

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

        if inviter.invitations > 0:

            code = _generate_invitation_code()

            invitation, created = Invitation.objects.get_or_create(

                inviter=inviter,

                username=username,

                defaults={'code': code, 'realname': realname})

            try:

                baseurl = request.build_absolute_uri('/').rstrip('/')

                _send_invitation(request, baseurl, invitation)

                if created:

                    inviter.invitations = max(0, inviter.invitations - 1)

                    inviter.save()

                status = messages.SUCCESS

                message = _('Invitation sent to %s' % username)

                transaction.commit()

            except (SMTPException, socket.error) as e:

                status = messages.ERROR

                message = getattr(e, 'strerror', '')

                transaction.rollback()

        else:

            status = messages.ERROR

            message = _('No invitations left')

    messages.add_message(request, status, message)

    sent = [{'email': inv.username,

                 'realname': inv.realname,

                 'is_accepted': inv.is_accepted}

                    for inv in inviter.invitations_sent.all()]

    kwargs = {'user': inviter,

              'sent':sent}

    context = get_context(request, extra_context, **kwargs)

    return render_response(template_name,

                           context_instance = context)

@login_required

def edit_profile(request, template_name='profile.html', extra_context={}):

    """

    Allows a user to edit his/her profile.

    In case of GET request renders a form for displaying the user information.

    In case of POST updates the user informantion and redirects to ``next``

    url parameter if exists.

    If the user isn't logged in, redirects to settings.LOGIN_URL.

    **Arguments**

    ``template_name``

        A custom template to use. This is optional; if not specified,

        this will default to ``profile.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

    profile.html or ``template_name`` keyword argument.

    """

    form = ProfileForm(instance=request.user)

    extra_context['next'] = request.GET.get('next')

    if request.method == 'POST':

        form = ProfileForm(request.POST, instance=request.user)

        if form.is_valid():

            try:

                form.save()

                msg = _('Profile has been updated successfully')

                messages.add_message(request, messages.SUCCESS, msg)

            except ValueError, ve:

                messages.add_message(request, messages.ERROR, ve)

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

        if next:

            return redirect(next)

    return render_response(template_name,

                           form = form,

                           context_instance = get_context(request,

                                                          extra_context,

                                                          user=request.user))

def signup(request, template_name='signup.html', extra_context={}, backend=None):

    """

    Allows a user to create a local account.

    In case of GET request renders a form for providing the user information.

    In case of POST handles the signup.

    The user activation will be delegated to the backend specified by the ``backend`` keyword argument

    if present, otherwise to the ``astakos.im.backends.InvitationBackend``

    if settings.INVITATIONS_ENABLED is True or ``astakos.im.backends.SimpleBackend`` if not

    (see backends);

    Upon successful user creation if ``next`` url parameter is present the user is redirected there

    otherwise renders the same page with a success message.

    On unsuccessful creation, renders the same page with an error message.

    **Arguments**

    ``template_name``

        A custom template to use. This is optional; if not specified,

        this will default to ``signup.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

    signup.html or ``template_name`` keyword argument.

    """

    try:

        if not backend:

            backend = get_backend(request)

        for provider in settings.IM_MODULES:

            extra_context['%s_form' % provider] = backend.get_signup_form(provider)

        if request.method == 'POST':

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

            next = request.POST.get('next', '')

            form = extra_context['%s_form' % provider]

            if form.is_valid():

                if provider != 'local':

                    url = reverse('astakos.im.target.%s.login' % provider)

                    url = '%s?email=%s&next=%s' % (url, form.data['email'], next)

                    if backend.invitation:

                        url = '%s&code=%s' % (url, backend.invitation.code)

                    return redirect(url)

                else:

                    status, message, user = backend.signup(form)

                    if status == messages.SUCCESS:

                        if next:

                            return redirect(next)

                    messages.add_message(request, status, message)

    except (Invitation.DoesNotExist, ValueError), e:

        messages.add_message(request, messages.ERROR, e)

        for provider in settings.IM_MODULES:

            main = provider.capitalize() if provider == 'local' else 'ThirdParty'

            formclass = '%sUserCreationForm' % main

            extra_context['%s_form' % provider] = globals()[formclass]()

    return render_response(template_name,

                           context_instance=get_context(request, extra_context))

@login_required

def send_feedback(request, template_name='feedback.html', email_template_name='feedback_mail.txt', extra_context={}):

    """

    Allows a user to send feedback.

    In case of GET request renders a form for providing the feedback information.

    In case of POST sends an email to support team.

    If the user isn't logged in, redirects to settings.LOGIN_URL.

    **Arguments**

    ``template_name``

        A custom template to use. This is optional; if not specified,

        this will default to ``feedback.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

    signup.html or ``template_name`` keyword argument.

    **Settings:**

    * DEFAULT_CONTACT_EMAIL: List of feedback recipients

    """

    if request.method == 'GET':

        form = FeedbackForm()

    if request.method == 'POST':

        if not request.user:

            return HttpResponse('Unauthorized', status=401)

        form = FeedbackForm(request.POST)

        if form.is_valid():

            sitename, sitedomain = get_current_site(request, use_https=request.is_secure())

            subject = _("Feedback from %s" % sitename)

            from_email = request.user.email

            recipient_list = [settings.DEFAULT_CONTACT_EMAIL % sitename.lower()]

            content = render_to_string(email_template_name, {

                        'message': form.cleaned_data['feedback_msg'],

                        'data': form.cleaned_data['feedback_data'],

                        'request': request})

            try:

                send_mail(subject, content, from_email, recipient_list)

                message = _('Feedback successfully sent')

                status = messages.SUCCESS

            except (SMTPException, socket.error) as e:

                status = messages.ERROR

                message = getattr(e, 'strerror', '')

            messages.add_message(request, status, message)

    return render_response(template_name,

                           form = form,

                           context_instance = get_context(request, extra_context))

def create_user(request, form, backend=None, post_data={}, next = None, template_name='login.html', extra_context={}):

    try:

        if not backend:

            backend = get_backend(request)

        if form.is_valid():

            status, message, user = backend.signup(form)

            if status == messages.SUCCESS:

                for k,v in post_data.items():

                    setattr(user,k, v)

                user.save()

                if next:

                    return redirect(next)

            messages.add_message(request, status, message)

        else:

            messages.add_message(request, messages.ERROR, form.errors)

    except (Invitation.DoesNotExist, ValueError), e:

        messages.add_message(request, messages.ERROR, e)

    return render_response(template_name,

                           form = LocalUserCreationForm(),

                           context_instance=get_context(request, extra_context))

def user_logout(request):

    response = HttpResponse()

    response.delete_cookie(settings.COOKIE_NAME)

    response['Location'] = reverse('django.contrib.auth.views.logout')

    response.status_code = 302

    return response