379 lines
12 KiB
Python
379 lines
12 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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openslides.utils.views
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~~~~~~~~~~~~~~~~~~~~~~
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Views for OpenSlides.
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:copyright: 2011, 2012 by OpenSlides team, see AUTHORS.
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:license: GNU GPL, see LICENSE for more details.
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"""
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import json
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try:
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from cStringIO import StringIO
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except ImportError:
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# Is this exception realy necessary?
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from StringIO import StringIO
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from reportlab.platypus import SimpleDocTemplate, Spacer
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from reportlab.lib.units import cm
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from django.contrib import messages
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from django.contrib.auth.decorators import login_required
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from django.core.context_processors import csrf
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from django.core.urlresolvers import reverse
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from django.conf import settings
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from django.dispatch import receiver
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from django.http import HttpResponseServerError, HttpResponse, HttpResponseRedirect
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from django.utils.decorators import method_decorator
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from django.utils.translation import ugettext as _, ugettext_lazy
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from django.utils.importlib import import_module
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from django.template import RequestContext
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from django.template.loader import render_to_string
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from django.views.generic import (
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TemplateView as _TemplateView,
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RedirectView as _RedirectView,
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UpdateView as _UpdateView,
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CreateView as _CreateView,
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View as _View,
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FormView as _FormView,
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ListView as _ListView,
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)
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from django.views.generic.detail import SingleObjectMixin
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from django.views.generic.list import TemplateResponseMixin
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from openslides.utils.utils import render_to_forbidden, html_strong
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from openslides.utils.signals import template_manipulation
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from openslides.utils.pdf import firstPage, laterPages
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NO_PERMISSION_REQUIRED = 'No permission required'
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View = _View
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class SetCookieMixin(object):
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def render_to_response(self, context, **response_kwargs):
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response = TemplateResponseMixin.render_to_response(
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self, context, **response_kwargs)
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if 'cookie' in context:
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response.set_cookie(context['cookie'][0], context['cookie'][1])
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return response
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class LoginMixin(object):
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@method_decorator(login_required)
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def dispatch(self, request, *args, **kwargs):
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return super(LoginMixin, self).dispatch(request, *args, **kwargs)
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class PermissionMixin(object):
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permission_required = NO_PERMISSION_REQUIRED
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def has_permission(self, request, *args, **kwargs):
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if self.permission_required == NO_PERMISSION_REQUIRED:
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return True
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else:
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return request.user.has_perm(self.permission_required)
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def dispatch(self, request, *args, **kwargs):
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if not self.has_permission(request, *args, **kwargs):
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if not request.user.is_authenticated():
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path = request.get_full_path()
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return HttpResponseRedirect(
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"%s?next=%s" % (settings.LOGIN_URL, path))
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else:
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return render_to_forbidden(request)
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return _View.dispatch(self, request, *args, **kwargs)
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class AjaxMixin(object):
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def get_ajax_context(self, **kwargs):
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return {}
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def ajax_get(self, request, *args, **kwargs):
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return HttpResponse(json.dumps(self.get_ajax_context(**kwargs)))
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class QuestionMixin(object):
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question = ugettext_lazy('Are you sure?')
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success_message = ugettext_lazy('Thank you for your answer')
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answer_options = [('yes', ugettext_lazy("Yes")), ('no', ugettext_lazy("No"))]
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def pre_redirect(self, request, *args, **kwargs):
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# Prints the question in a GET request
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self.confirm_form()
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def get_question(self):
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return unicode(self.question)
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def get_answer_options(self):
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return self.answer_options
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def get_answer_url(self):
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try:
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return self.answer_url
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except AttributeError:
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return self.request.path
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def confirm_form(self):
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option_fields = "\n".join([
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'<input type="submit" name="%s" value="%s">' % (option[0], unicode(option[1]))
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for option in self.get_answer_options()])
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messages.warning(
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self.request,
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"""
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%(message)s
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<form action="%(url)s" method="post">
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<input type="hidden" value="%(csrf)s" name="csrfmiddlewaretoken">
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%(option_fields)s
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</form>
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""" % {'message': self.get_question(),
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'url': self.get_answer_url(),
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'csrf': csrf(self.request)['csrf_token'],
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'option_fields': option_fields})
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def pre_post_redirect(self, request, *args, **kwargs):
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# Reacts on the response of the user in a POST-request.
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# TODO: call the methodes for all possible answers.
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if self.get_answer() == 'yes':
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self.case_yes()
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messages.success(request, self.get_success_message())
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def get_answer(self):
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for option in self.get_answer_options():
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if option[0] in self.request.POST:
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return option[0]
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return None
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def case_yes(self):
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# TODO: raise a warning
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pass
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def get_success_message(self):
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return self.success_message
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class TemplateView(PermissionMixin, _TemplateView):
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def get_context_data(self, **kwargs):
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context = super(TemplateView, self).get_context_data(**kwargs)
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template_manipulation.send(
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sender=self.__class__, request=self.request, context=context)
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return context
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class ListView(PermissionMixin, SetCookieMixin, _ListView):
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def get_context_data(self, **kwargs):
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context = super(ListView, self).get_context_data(**kwargs)
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template_manipulation.send(
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sender=self.__class__, request=self.request, context=context)
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return context
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class AjaxView(PermissionMixin, AjaxMixin, View):
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def get(self, request, *args, **kwargs):
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return self.ajax_get(request, *args, **kwargs)
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class RedirectView(PermissionMixin, AjaxMixin, _RedirectView):
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permanent = False
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allow_ajax = False
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def pre_redirect(self, request, *args, **kwargs):
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pass
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def pre_post_redirect(self, request, *args, **kwargs):
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pass
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def get(self, request, *args, **kwargs):
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if request.method == 'GET':
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self.pre_redirect(request, *args, **kwargs)
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elif request.method == 'POST':
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self.pre_post_redirect(request, *args, **kwargs)
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if self.request.is_ajax() and self.allow_ajax:
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return self.ajax_get(request, *args, **kwargs)
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return super(RedirectView, self).get(request, *args, **kwargs)
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def get_redirect_url(self, **kwargs):
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return reverse(super(RedirectView, self).get_redirect_url(**kwargs))
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class FormView(PermissionMixin, _FormView):
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def get_success_url(self):
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if not self.success_url:
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return ''
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return reverse(super(FormView, self).get_success_url())
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def get_context_data(self, **kwargs):
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context = super(FormView, self).get_context_data(**kwargs)
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template_manipulation.send(
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sender=self.__class__, request=self.request, context=context)
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return context
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def form_invalid(self, form):
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messages.error(self.request, _('Please check the form for errors.'))
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return super(FormView, self).form_invalid(form)
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class UpdateView(PermissionMixin, _UpdateView):
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def get_success_url(self):
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messages.success(self.request, self.get_success_message())
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if 'apply' in self.request.POST:
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return ''
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return reverse(super(UpdateView, self).get_success_url())
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def get_context_data(self, **kwargs):
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context = super(UpdateView, self).get_context_data(**kwargs)
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template_manipulation.send(
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sender=self.__class__, request=self.request, context=context)
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return context
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def form_invalid(self, form):
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messages.error(self.request, _('Please check the form for errors.'))
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return super(UpdateView, self).form_invalid(form)
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def get_success_message(self):
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return _('%s was successfully modified.') % html_strong(self.object)
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class CreateView(PermissionMixin, _CreateView):
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apply_url = None
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def get_success_url(self):
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messages.success(self.request, self.get_success_message())
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if 'apply' in self.request.POST:
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return reverse(self.get_apply_url(), args=[self.object.id])
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return reverse(super(CreateView, self).get_success_url())
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def get_context_data(self, **kwargs):
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context = super(CreateView, self).get_context_data(**kwargs)
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template_manipulation.send(
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sender=self.__class__, request=self.request, context=context)
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return context
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def get_apply_url(self):
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if self.apply_url:
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return self.apply_url
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else:
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raise ImproperlyConfigured(
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"No URL to redirect to. Provide a apply_url.")
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def form_invalid(self, form):
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messages.error(self.request, _('Please check the form for errors.'))
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return super(CreateView, self).form_invalid(form)
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def form_valid(self, form):
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self.object = form.save(commit=False)
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self.manipulate_object(form)
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self.object.save()
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form.save_m2m()
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return HttpResponseRedirect(self.get_success_url())
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def get_success_message(self):
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return _('%s was successfully created.') % html_strong(self.object)
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def manipulate_object(self, form):
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pass
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class DeleteView(SingleObjectMixin, QuestionMixin, RedirectView):
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def get(self, request, *args, **kwargs):
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self.object = self.get_object()
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return super(DeleteView, self).get(request, *args, **kwargs)
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def get_question(self):
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return _('Do you really want to delete %s?') % html_strong(self.object)
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def case_yes(self):
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self.object.delete()
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def get_success_message(self):
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return _('%s was successfully deleted.') % html_strong(self.object)
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class DetailView(TemplateView, SingleObjectMixin):
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def get(self, request, *args, **kwargs):
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self.object = self.get_object()
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return super(DetailView, self).get(request, *args, **kwargs)
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def get_context_data(self, **kwargs):
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context = super(DetailView, self).get_context_data(**kwargs)
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context.update(SingleObjectMixin.get_context_data(self, **kwargs))
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return context
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class PDFView(PermissionMixin, View):
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filename = _('undefined-filename')
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top_space = 3
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document_title = None
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def get_top_space(self):
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return self.top_space
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def get_document_title(self):
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if self.document_title:
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return unicode(self.document_title)
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else:
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return ''
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def get_filename(self):
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return self.filename
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def get_template(self, buffer):
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return SimpleDocTemplate(buffer)
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def build_document(self, pdf_document, story):
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pdf_document.build(
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story, onFirstPage=firstPage, onLaterPages=laterPages)
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def render_to_response(self, filename):
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response = HttpResponse(mimetype='application/pdf')
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filename = u'filename=%s.pdf;' % self.get_filename()
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response['Content-Disposition'] = filename.encode('utf-8')
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buffer = StringIO()
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pdf_document = self.get_template(buffer)
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pdf_document.title = self.get_document_title()
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story = [Spacer(1, self.get_top_space() * cm)]
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self.append_to_pdf(story)
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self.build_document(pdf_document, story)
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pdf = buffer.getvalue()
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buffer.close()
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response.write(pdf)
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return response
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def get(self, request, *args, **kwargs):
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return self.render_to_response(self.get_filename())
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def server_error(request, template_name='500.html'):
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"""
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500 error handler.
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Templates: `500.html`
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"""
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return HttpResponseServerError(render_to_string(
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template_name, context_instance=RequestContext(request)))
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@receiver(template_manipulation, dispatch_uid="send_register_tab")
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def send_register_tab(sender, request, context, **kwargs):
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tabs = []
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for app in settings.INSTALLED_APPS:
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try:
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mod = import_module(app + '.views')
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tabs.append(mod.register_tab(request))
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except (ImportError, AttributeError):
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continue
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context.update({
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'tabs': tabs,
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})
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