Synnefo

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

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from functools import wraps

from traceback import format_exc

from urllib import quote, unquote

from django.http import HttpResponse

from django.utils import simplejson as json

from django.conf import settings

from django.core.urlresolvers import reverse

from django.utils.translation import ugettext as _

from astakos.im.models import AstakosUser, Service, Resource

from astakos.im.api.faults import Fault, ItemNotFound, InternalServerError, BadRequest

from astakos.im.settings import (

    INVITATIONS_ENABLED, COOKIE_NAME, EMAILCHANGE_ENABLED, QUOTAHOLDER_URL)

import logging

logger = logging.getLogger(__name__)

format = ('%a, %d %b %Y %H:%M:%S GMT')

absolute = lambda request, url: request.build_absolute_uri(url)

def render_fault(request, fault):

    if isinstance(fault, InternalServerError) and settings.DEBUG:

        fault.details = format_exc(fault)

    request.serialization = 'text'

    data = fault.message + '\n'

    if fault.details:

        data += '\n' + fault.details

    response = HttpResponse(data, status=fault.code)

    response['Content-Length'] = len(response.content)

    return response

def api_method(http_method=None):

    """Decorator function for views that implement an API method."""

    def decorator(func):

        @wraps(func)

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

            try:

                if http_method and request.method != http_method:

                    raise BadRequest('Method not allowed.')

                response = func(request, *args, **kwargs)

                return response

            except Fault, fault:

                return render_fault(request, fault)

            except BaseException, e:

                logger.exception('Unexpected error: %s' % e)

                fault = InternalServerError('Unexpected error')

                return render_fault(request, fault)

        return wrapper

    return decorator

def get_services_dict():

    services = Service.objects.all()

    data = tuple({'id': s.pk, 'name': s.name, 'url': s.url, 'icon':

                 s.icon} for s in services)

    return data

@api_method(http_method=None)

def get_services(request):

    callback = request.GET.get('callback', None)

    mimetype = 'application/json'

    data = json.dumps(get_services_dict())

    if callback:

        mimetype = 'application/javascript'

        data = '%s(%s)' % (callback, data)

    return HttpResponse(content=data, mimetype=mimetype)

@api_method()

def get_menu(request, with_extra_links=False, with_signout=True):

    user = request.user

    from_location = request.GET.get('location')

    index_url = reverse('index')

    if from_location:

        index_url = "%s?next=%s" % (index_url, from_location)

    l = [{'url': absolute(request, index_url), 'name': _("Sign in")}]

    if user.is_authenticated():

        l = []

        append = l.append

        item = MenuItem

        item.current_path = absolute(request, request.path)

        append(item(

               url=absolute(request, reverse('index')),

               name=user.email))

        append(item(url=absolute(request, reverse('edit_profile')),

               name="My account"))

        if with_extra_links:

            if EMAILCHANGE_ENABLED:

                append(item(

                       url=absolute(request, reverse('email_change')),

                       name="Change email"))

            if INVITATIONS_ENABLED:

                append(item(

                       url=absolute(request, reverse('invite')),

                       name="Invitations"))

            if QUOTAHOLDER_URL:

                append(item(

                       url=absolute(request, reverse('project_list')),

                       name="Projects"))

            append(item(

                   url=absolute(request, reverse('resource_usage')),

                   name="Usage"))

            append(item(

                   url=absolute(request, reverse('feedback')),

                   name="Contact"))

        if with_signout:

            append(item(

                   url=absolute(request, reverse('logout')),

                   name="Sign out"))

    callback = request.GET.get('callback', None)

    data = json.dumps(tuple(l))

    mimetype = 'application/json'

    if callback:

        mimetype = 'application/javascript'

        data = '%s(%s)' % (callback, data)

    return HttpResponse(content=data, mimetype=mimetype)

class MenuItem(dict):

    current_path = ''

    def __init__(self, *args, **kwargs):

        super(MenuItem, self).__init__(*args, **kwargs)

        if kwargs.get('url') or kwargs.get('submenu'):

            self.__set_is_active__()

    def __setitem__(self, key, value):

        super(MenuItem, self).__setitem__(key, value)

        if key in ('url', 'submenu'):

            self.__set_is_active__()

    def __set_is_active__(self):

        if self.get('is_active'):

            return

        if self.current_path.startswith(self.get('url')):

            self.__setitem__('is_active', True)

        else:

            submenu = self.get('submenu', ())

            current = (i for i in submenu if i.get('url') == self.current_path)

            try:

                current_node = current.next()

                if not current_node.get('is_active'):

                    current_node.__setitem__('is_active', True)

                self.__setitem__('is_active', True)

            except StopIteration:

                return

    def __setattribute__(self, name, value):

        super(MenuItem, self).__setattribute__(name, value)

        if name == 'current_path':

            self.__set_is_active__()