Synnefo

# 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 logging

import socket

from smtplib import SMTPException

from urllib import quote

from functools import wraps

from django.core.mail import send_mail

from django.http import HttpResponse, HttpResponseBadRequest

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.utils.http import urlencode

from django.http import HttpResponseRedirect, HttpResponseBadRequest

from django.db.utils import IntegrityError

from django.contrib.auth.views import password_change

from django.core.exceptions import ValidationError

from django.db.models import Q

from astakos.im.models import AstakosUser, Invitation, ApprovalTerms

from astakos.im.activation_backends import get_backend, SimpleBackend

from astakos.im.util import get_context, prepare_response, set_cookie, get_query

from astakos.im.forms import *

from astakos.im.functions import send_greeting, send_feedback, SendMailError, \

    invite as invite_func, logout as auth_logout, activate as activate_func, switch_account_to_shibboleth

from astakos.im.settings import DEFAULT_CONTACT_EMAIL, DEFAULT_FROM_EMAIL, COOKIE_NAME, COOKIE_DOMAIN, IM_MODULES, SITENAME, LOGOUT_NEXT, LOGGING_LEVEL

logger = logging.getLogger(__name__)

def render_response(template, tab=None, status=200, reset_cookie=False, 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)

    response = HttpResponse(html, status=status)

    if reset_cookie:

        set_cookie(response, context_instance['request'].user)

    return response

def requires_anonymous(func):

    """

    Decorator checkes whether the request.user is not 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()})

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

            return HttpResponseRedirect(logout_uri)

        return func(request, *args)

    return wrapper

def signed_terms_required(func):

    """

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

    redirects to `logout`.

    """

    @wraps(func)

    def wrapper(request, *args, **kwargs):

        if request.user.is_authenticated() and not request.user.signed_terms():

            params = urlencode({'next': request.build_absolute_uri(),

                              'show_form':''})

            terms_uri = reverse('latest_terms') + '?' + params

            return HttpResponseRedirect(terms_uri)

        return func(request, *args, **kwargs)

    return wrapper

@signed_terms_required

def index(request, login_template_name='im/login.html', profile_template_name='im/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 ``im/login.html``.

    ``profile_template_name``

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

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

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

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

    """

    template_name = login_template_name

    if request.user.is_authenticated():

        return HttpResponseRedirect(reverse('astakos.im.views.edit_profile'))

    return render_response(template_name,

                           login_form = LoginForm(request=request),

                           context_instance = get_context(request, extra_context))

@login_required

@signed_terms_required

@transaction.commit_manually

def invite(request, template_name='im/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 ``im/invitations.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

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

    **Settings:**

    The view expectes the following settings are defined:

    * LOGIN_URL: login uri

    * ASTAKOS_DEFAULT_CONTACT_EMAIL: service support email

    * ASTAKOS_DEFAULT_FROM_EMAIL: from email

    """

    status = None

    message = None

    form = InvitationForm()

    inviter = request.user

    if request.method == 'POST':

        form = InvitationForm(request.POST)

        if inviter.invitations > 0:

            if form.is_valid():

                try:

                    invitation = form.save()

                    invite_func(invitation, inviter)

                    status = messages.SUCCESS

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

                except SendMailError, e:

                    status = messages.ERROR

                    message = e.message

                    transaction.rollback()

                except BaseException, e:

                    status = messages.ERROR

                    message = _('Something went wrong.')

                    logger.exception(e)

                    transaction.rollback()

                else:

                    transaction.commit()

        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 request.user.invitations_sent.all()]

    kwargs = {'inviter': inviter,

              'sent':sent}

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

    return render_response(template_name,

                           invitation_form = form,

                           context_instance = context)

@login_required

@signed_terms_required

def edit_profile(request, template_name='im/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 ``im/profile.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

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

    **Settings:**

    The view expectes the following settings are defined:

    * LOGIN_URL: login uri

    """

    form = ProfileForm(instance=request.user)

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

    reset_cookie = False

    if request.method == 'POST':

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

        if form.is_valid():

            try:

                prev_token = request.user.auth_token

                user = form.save()

                reset_cookie = user.auth_token != prev_token

                form = ProfileForm(instance=user)

                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)

    elif request.method == "GET":

        request.user.is_verified = True

        request.user.save()

    return render_response(template_name,

                           reset_cookie = reset_cookie,

                           profile_form = form,

                           context_instance = get_context(request,

                                                          extra_context))

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

    """

    Allows a user to create a local account.

    In case of GET request renders a form for entering 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.activation_backends.InvitationBackend``

    if settings.ASTAKOS_INVITATIONS_ENABLED is True or ``astakos.im.activation_backends.SimpleBackend`` if not

    (see activation_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 ``template_name`` with an error message.

    **Arguments**

    ``template_name``

        A custom template to render. This is optional;

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

    ``on_success``

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

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

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

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

    im/signup_complete.html or ``on_success`` keyword argument. 

    """

    if request.user.is_authenticated():

        return HttpResponseRedirect(reverse('astakos.im.views.edit_profile'))

    provider = get_query(request).get('provider', 'local')

    try:

        if not backend:

            backend = get_backend(request)

        form = backend.get_signup_form(provider)

    except Exception, e:

        form = SimpleBackend(request).get_signup_form(provider)

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

    if request.method == 'POST':

        if form.is_valid():

            user = form.save(commit=False)

            try:

                result = backend.handle_activation(user)

                status = messages.SUCCESS

                message = result.message

                user.save()

                if 'additional_email' in form.cleaned_data:

                    additional_email = form.cleaned_data['additional_email']

                    if additional_email != user.email:

                        user.additionalmail_set.create(email=additional_email)

                        msg = 'Additional email: %s saved for user %s.' % (additional_email, user.email)

                        logger._log(LOGGING_LEVEL, msg, [])

                if user and user.is_active:

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

                    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 SendMailError, e:

                status = messages.ERROR

                message = e.message

                messages.add_message(request, status, message)

            except BaseException, e:

                status = messages.ERROR

                message = _('Something went wrong.')

                messages.add_message(request, status, message)

                logger.exception(e)

    return render_response(template_name,

                           signup_form = form,

                           provider = provider,

                           context_instance=get_context(request, extra_context))

@login_required

@signed_terms_required

def feedback(request, template_name='im/feedback.html', email_template_name='im/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 ``im/feedback.html``.

    ``extra_context``

        An dictionary of variables to add to the template context.

    **Template:**

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

    **Settings:**

    * LOGIN_URL: login uri

    * ASTAKOS_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():

            msg = form.cleaned_data['feedback_msg']

            data = form.cleaned_data['feedback_data']

            try:

                send_feedback(msg, data, request.user, email_template_name)

            except SendMailError, e:

                message = e.message

                status = messages.ERROR

            else:

                message = _('Feedback successfully sent')

                status = messages.SUCCESS

            messages.add_message(request, status, message)

    return render_response(template_name,

                           feedback_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.

    """

    msg = 'Cookie deleted for %s' % (request.user.email)

    auth_logout(request)

    response = HttpResponse()

    response.delete_cookie(COOKIE_NAME, path='/', domain=COOKIE_DOMAIN)

    logger._log(LOGGING_LEVEL, msg, [])

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

    if next:

        response['Location'] = next

        response.status_code = 302

        return response

    elif LOGOUT_NEXT:

        response['Location'] = LOGOUT_NEXT

        response.status_code = 301

        return response

    messages.add_message(request, messages.SUCCESS, _('You have successfully logged out.'))

    context = get_context(request, extra_context)

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

    return response

@transaction.commit_manually

def activate(request, email_template_name='im/welcome_email.txt', helpdesk_email_template_name='im/helpdesk_notification.txt'):

    """

    Activates the user identified by the ``auth`` request parameter, sends a welcome email

    and renews the user token.

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

    only if the email will be send successfully.

    """

    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'))

    if user.is_active:

        message = _('Account already active.')

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

        return index(request)

    try:

        local_user = AstakosUser.objects.get(~Q(id = user.id), email=user.email, is_active=True)

    except AstakosUser.DoesNotExist:

        try:

            activate_func(user, email_template_name, helpdesk_email_template_name, verify_email=True)

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

            transaction.commit()

            return response

        except SendMailError, e:

            message = e.message

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

            transaction.rollback()

            return index(request)

        except BaseException, e:

            status = messages.ERROR

            message = _('Something went wrong.')

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

            logger.exception(e)

            transaction.rollback()

            return index(request)

    else:

        try:

            user = switch_account_to_shibboleth(user, local_user, email_template_name)

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

            transaction.commit()

            return response

        except SendMailError, e:

            message = e.message

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

            transaction.rollback()

            return index(request)

        except BaseException, e:

            status = messages.ERROR

            message = _('Something went wrong.')

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

            logger.exception(e)

            transaction.rollback()

            return index(request)

def approval_terms(request, term_id=None, template_name='im/approval_terms.html', extra_context={}):

    term = None

    terms = None

    if not term_id:

        try:

            term = ApprovalTerms.objects.order_by('-id')[0]

        except IndexError:

            pass

    else:

        try:

             term = ApprovalTerms.objects.get(id=term_id)

        except ApprovalTermDoesNotExist, e:

            pass

    if not term:

        return HttpResponseRedirect(reverse('astakos.im.views.index'))

    f = open(term.location, 'r')

    terms = f.read()

    if request.method == 'POST':

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

        if not next:

            next = reverse('astakos.im.views.index')

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

        if not form.is_valid():

            return render_response(template_name,

                           terms = terms,

                           approval_terms_form = form,

                           context_instance = get_context(request, extra_context))

        user = form.save()

        return HttpResponseRedirect(next)

    else:

        form = None

        if request.user.is_authenticated() and not request.user.signed_terms():

            form = SignApprovalTermsForm(instance=request.user)

        return render_response(template_name,

                               terms = terms,

                               approval_terms_form = form,

                               context_instance = get_context(request, extra_context))

@signed_terms_required

def change_password(request):

    return password_change(request, post_change_redirect=reverse('astakos.im.views.edit_profile'))

@transaction.commit_manually

def change_email(request, activation_key=None,

                 email_template_name='registration/email_change_email.txt',

                 form_template_name='registration/email_change_form.html',

                 confirm_template_name='registration/email_change_done.html',

                 extra_context={}):

    if activation_key:

        try:

            user = EmailChange.objects.change_email(activation_key)

            if request.user.is_authenticated() and request.user == user:

                msg = _('Email changed successfully.')

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

                auth_logout(request)

                response = prepare_response(request, user)

                transaction.commit()

                return response

        except ValueError, e:

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

        return render_response(confirm_template_name,

                               modified_user = user if 'user' in locals() else None,

                               context_instance = get_context(request,

                                                              extra_context))

    if not request.user.is_authenticated():

        path = quote(request.get_full_path())

        url = request.build_absolute_uri(reverse('astakos.im.views.index'))

        return HttpResponseRedirect(url + '?next=' + path)

    form = EmailChangeForm(request.POST or None)

    if request.method == 'POST' and form.is_valid():

        try:

            ec = form.save(email_template_name, request)

        except SendMailError, e:

            status = messages.ERROR

            msg = e

            transaction.rollback()

        except IntegrityError, e:

            status = messages.ERROR

            msg = _('There is already a pending change email request.')

        else:

            status = messages.SUCCESS

            msg = _('Change email request has been registered succefully.\

                    You are going to receive a verification email in the new address.')

            transaction.commit()

        messages.add_message(request, status, msg)

    return render_response(form_template_name,

                           form = form,

                           context_instance = get_context(request,

                                                          extra_context))