Synnefo » Pithos

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

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

# without modification, are permitted provided that the following

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#   1. Redistributions of source code must retain the above

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#      disclaimer.

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#   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.

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# 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,

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

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import json

import logging

import socket

from datetime import datetime

from functools import wraps

from math import ceil

from random import randint

from smtplib import SMTPException

from django.conf import settings

from django.core.mail import send_mail

from django.http import HttpResponse, HttpResponseRedirect

from django.shortcuts import redirect

from django.template.loader import render_to_string

from django.utils.http import urlencode

from django.utils.translation import ugettext as _

from pithos.im.models import User, Invitation

from pithos.im.util import isoformat

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

    if tab is None:

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

    kwargs.setdefault('tab', tab)

    html = render_to_string(template, kwargs)

    return HttpResponse(html, status=status)

def requires_login(func):

    @wraps(func)

    def wrapper(request, *args):

        if not settings.BYPASS_ADMIN_AUTH:

            if not request.user:

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

                login_uri = settings.LOGIN_URL + '?' + next

                return HttpResponseRedirect(login_uri)

        return func(request, *args)

    return wrapper

def requires_admin(func):

    @wraps(func)

    def wrapper(request, *args):

        if not settings.BYPASS_ADMIN_AUTH:

            if not request.user:

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

                login_uri = settings.LOGIN_URL + '?' + next

                return HttpResponseRedirect(login_uri)

            if not request.user_obj.is_admin:

                return HttpResponse('Forbidden', status=403)

        return func(request, *args)

    return wrapper

def index(request):

    # TODO: Get and pass on next variable.

    return render_response('index.html')

@requires_admin

def admin(request):

    stats = {}

    stats['users'] = User.objects.count()

    return render_response('admin.html', tab='home', stats=stats)

@requires_admin

def users_list(request):

    users = User.objects.order_by('id')

    filter = request.GET.get('filter', '')

    if filter:

        if filter.startswith('-'):

            users = users.exclude(uniq__icontains=filter[1:])

        else:

            users = users.filter(uniq__icontains=filter)

    try:

        page = int(request.GET.get('page', 1))

    except ValueError:

        page = 1

    offset = max(0, page - 1) * settings.ADMIN_PAGE_LIMIT

    limit = offset + settings.ADMIN_PAGE_LIMIT

    npages = int(ceil(1.0 * users.count() / settings.ADMIN_PAGE_LIMIT))

    prev = page - 1 if page > 1 else None

    next = page + 1 if page < npages else None

    return render_response('users_list.html',

                            users=users[offset:limit],

                            filter=filter,

                            pages=range(1, npages + 1),

                            page=page,

                            prev=prev,

                            next=next)

@requires_admin

def users_create(request):

    if request.method == 'GET':

        return render_response('users_create.html')

    if request.method == 'POST':

        user = User()

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

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

        user.is_admin = True if request.POST.get('admin') else False

        user.affiliation = request.POST.get('affiliation')

        user.quota = int(request.POST.get('quota') or 0) * (1024 ** 3)  # In GiB

        user.renew_token()

        user.save()

        return redirect(users_info, user.id)

@requires_admin

def users_info(request, user_id):

    user = User.objects.get(id=user_id)

    return render_response('users_info.html', user=user)

@requires_admin

def users_modify(request, user_id):

    user = User.objects.get(id=user_id)

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

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

    user.is_admin = True if request.POST.get('admin') else False

    user.affiliation = request.POST.get('affiliation')

    user.quota = int(request.POST.get('quota') or 0) * (1024 ** 3)  # In GiB

    user.auth_token = request.POST.get('auth_token')

    try:

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

        d = datetime.strptime(auth_token_expires, '%Y-%m-%dT%H:%MZ')

        user.auth_token_expires = d

    except ValueError:

        pass

    user.save()

    return redirect(users_info, user.id)

@requires_admin

def users_delete(request, user_id):

    user = User.objects.get(id=user_id)

    user.delete()

    return redirect(users_list)

def generate_invitation_code():

    return randint(1, 2L**63 - 1)

def send_invitation(inv):

    url = settings.INVITATION_LOGIN_TARGET % inv.code

    subject = _('Invitation to Pithos')

    message = render_to_string('invitation.txt', {

                'invitation': inv,

                'url': url})

    sender = settings.DEFAULT_FROM_EMAIL

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

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

    inv.inviter.save()

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

@requires_login

def invite(request):

    status = None

    message = None

    if request.method == 'POST':

        if request.user_obj.invitations > 0:

            code = generate_invitation_code()

            invitation, created = Invitation.objects.get_or_create(code=code)

            invitation.inviter=request.user_obj

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

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

            invitation.save()

            try:

                send_invitation(invitation)

                status = 'success'

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

            except (SMTPException, socket.error) as e:

                status = 'error'

                message = e.strerror

        else:

            status = 'error'

            message = _('No invitations left')

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

        rep = {'invitations': request.user_obj.invitations}

        return HttpResponse(json.dumps(rep))

    html = render_to_string('invitations.html', {

            'user': request.user_obj,

            'status': status,

            'message': message})

    return HttpResponse(html)