Synnefo

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

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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.openid_store import PithosOpenIDStore

from astakos.im.models import AstakosUser, Invitation

from astakos.im.util import isoformat, get_or_create_user, get_context

from astakos.im.backends import get_backend

from astakos.im.forms import ProfileForm, FeedbackForm, LoginForm

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]

    kwargs.setdefault('tab', tab)

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

    return HttpResponse(html, status=status)

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

    """

    Renders the index (login) page

    **Arguments**

    ``template_name``

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

        this will default to ``index.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

    index.html or ``template_name`` keyword argument.

    """

    return render_response(template_name,

                           form = LoginForm(),

                           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):

    subject = _('Invitation to Astakos')

    site = Site.objects.get_current()

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

    message = render_to_string('invitation.txt', {

                'invitation': inv,

                'url': url,

                'baseurl': baseurl,

                'service': site.name,

                'support': settings.DEFAULT_CONTACT_EMAIL})

    sender = settings.DEFAULT_FROM_EMAIL

    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)

    if request.GET.get('format') == 'json':

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

                 'realname': inv.realname,

                 'is_accepted': inv.is_accepted}

                    for inv in inviter.invitations_sent.all()]

        rep = {'invitations': inviter.invitations, 'sent': sent}

        return HttpResponse(json.dumps(rep))

    kwargs = {'user': inviter}

    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.

    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.

    """

    try:

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

        form = ProfileForm(instance=user)

    except AstakosUser.DoesNotExist:

        token = request.GET.get('auth', None)

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

    if request.method == 'POST':

        form = ProfileForm(request.POST, instance=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)

    return render_response(template_name,

                           form = form,

                           context_instance = get_context(request,

                                                          extra_context,

                                                          user=user))

@transaction.commit_manually

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.

    The view uses commit_manually decorator in order to ensure the user will be created

    only if the procedure has been completed successfully.

    **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.

    """

    if not backend:

            backend = get_backend(request)

    try:

        form = backend.get_signup_form()

        if request.method == 'POST':

            if form.is_valid():

                status, message = backend.signup(form)

                # rollback incase of error

                if status == messages.ERROR:

                    transaction.rollback()

                else:

                    transaction.commit()

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

                    if next:

                        return redirect(next)

                messages.add_message(request, status, message)

    except Invitation.DoesNotExist, e:

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

    return render_response(template_name,

                           form = form if 'form' in locals() else UserCreationForm(),

                           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:**

    * FEEDBACK_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():

            subject = _("Feedback from Okeanos")

            from_email = request.user.email

            recipient_list = [settings.FEEDBACK_CONTACT_EMAIL]

            content = render_to_string(email_template_name, {

                        'message': form.cleaned_data('feedback_msg'),

                        'data': form.cleaned_data('feedback_data'),

                        'request': request})

            send_mail(subject, content, from_email, recipient_list)

            resp = json.dumps({'status': 'send'})

            return HttpResponse(resp)

    return render_response(template_name,

                           form = form,

                           context_instance = get_context(request, extra_context))