Synnefo

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import logging

import socket

from random import randint

from smtplib import SMTPException

from urllib import quote

from functools import wraps

from django.conf import settings

from django.core.mail import send_mail

from django.http import HttpResponse

from django.shortcuts import redirect

from django.template.loader import render_to_string

from django.utils.translation import ugettext as _

from django.core.urlresolvers import reverse

from django.contrib.auth.decorators import login_required

from django.contrib import messages

from django.db import transaction

from django.contrib.auth import logout as auth_logout

from django.utils.http import urlencode

from django.http import HttpResponseRedirect

from astakos.im.models import AstakosUser, Invitation

from astakos.im.backends import get_backend

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

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 requires_anonymous(func):

    """

    Decorator checkes whether the request.user is Anonymous and in that case

    redirects to `logout`.

    """

    @wraps(func)

    def wrapper(request, *args):

        if not request.user.is_anonymous():

            next = urlencode({'next': request.build_absolute_uri()})

            login_uri = reverse(logout) + '?' + next

            return HttpResponseRedirect(login_uri)

        return func(request, *args)

    return wrapper

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)

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

    url = '%s%s?code=%d' % (baseurl, reverse('astakos.im.views.signup'), inv.code)

    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

    * 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 = Invitation(inviter=inviter,

                                    username=username,

                                    code=code,

                                    realname=realname)

            invitation.save()

            try:

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

                _send_invitation(request, baseurl, invitation)

                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_consumed': inv.is_consumed}

             for inv in inviter.invitations_sent.all()]

    kwargs = {'inviter': 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()

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

                if next:

                    return redirect(next)

                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=request.user))

def signup(request, on_failure='signup.html', on_success='signup_complete.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**

    ``on_failure``

        A custom template to render in case of failure. This is optional;

        if not specified, this will default to ``signup.html``.

    ``on_success``

        A custom template to render in case of success. This is optional;

        if not specified, this will default to ``signup_complete.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

    signup.html or ``on_failure`` keyword argument.

    signup_complete.html or ``on_success`` 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 user and user.is_active:

                        return prepare_response(request, user, next=next)

                    messages.add_message(request, status, message)

                    return render_response(on_success,

                           context_instance=get_context(request, extra_context))

    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(on_failure,

                           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 logout(request, template='registration/logged_out.html', extra_context={}):

    """

    Wraps `django.contrib.auth.logout` and delete the cookie.

    """

    auth_logout(request)

    response = HttpResponse()

    response.delete_cookie(settings.COOKIE_NAME)

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

    if next:

        response['Location'] = next

        response.status_code = 302

        return response

    context = get_context(request, extra_context)

    response.write(render_to_string(template, context_instance=context))

    return response

def activate(request):

    """

    Activates the user identified by the ``auth`` request parameter

    """

    token = request.GET.get('auth')

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

    try:

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

    except AstakosUser.DoesNotExist:

        return HttpResponseBadRequest('No such user')

    user.is_active = True

    user.save()

    return prepare_response(request, user, next, renew=True)