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 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

    index_url = reverse('index')

    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__()