584 lines
17 KiB
Python
584 lines
17 KiB
Python
# -*- coding: utf-8 -*-
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import json
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from cStringIO import StringIO
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from django.conf import settings
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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.exceptions import ImproperlyConfigured, PermissionDenied
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from django.core.urlresolvers import reverse
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from django.http import (HttpResponse, HttpResponseRedirect)
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from django.utils.decorators import method_decorator
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from django.utils.translation import ugettext as _
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from django.utils.translation import ugettext_lazy
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from django.views import generic as django_views
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from django.views.generic.detail import SingleObjectMixin
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from reportlab.lib.units import cm
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from reportlab.platypus import SimpleDocTemplate, Spacer
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from .exceptions import OpenSlidesError
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from .pdf import firstPage, laterPages
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from .signals import template_manipulation
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from .utils import html_strong
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NO_PERMISSION_REQUIRED = 'No permission required'
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View = django_views.View
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class LoginMixin(object):
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"""
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Mixin for Views, that only can be viseted from users how are logedin.
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"""
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@method_decorator(login_required)
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def dispatch(self, request, *args, **kwargs):
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"""
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Check if the user is loged in.
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"""
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return super(LoginMixin, self).dispatch(request, *args, **kwargs)
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class PermissionMixin(object):
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"""
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Mixin for views, that only can be visited from users with special rights.
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Set the attribute 'permission_required' to the required permission string.
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"""
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permission_required = NO_PERMISSION_REQUIRED
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# TODO: Rename this to check_permission
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def has_permission(self, request, *args, **kwargs):
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"""
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Checks if the user has the required permission.
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"""
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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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"""
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Check if the user has the permission.
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If the user is not logged in, redirect the user to the login page.
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"""
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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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raise PermissionDenied
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return super(PermissionMixin, self).dispatch(request, *args, **kwargs)
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class AjaxMixin(object):
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"""
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Mixin to response to an ajax request with an json object.
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"""
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def get_ajax_context(self, **kwargs):
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"""
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Returns a dictonary with the context for the ajax response.
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"""
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return kwargs
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def ajax_get(self, request, *args, **kwargs):
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"""
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Returns the HttpResponse.
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"""
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return HttpResponse(json.dumps(self.get_ajax_context()))
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class ExtraContextMixin(object):
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"""
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Mixin to send the signal 'template_manipulation' to add extra content to the
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context of the view.
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For example this is used to add the main menu of openslides.
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"""
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def get_context_data(self, **kwargs):
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"""
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Sends the signal.
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"""
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context = super(ExtraContextMixin, 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 UrlMixin(object):
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url_name_args = None
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def get_url(self, url_name=None, url=None, args=None, use_absolute_url_link=None):
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"""
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Returns an url.
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Tries
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1. to use the reverse for the attribute 'url_name',
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2. to use the attribute 'url' or
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3. to use self.object.get_absolute_url().
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Uses the attribute 'use_absolute_url_link' as argument for
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get_absolute_url in the third step. If the attribute is 'None' then
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the default value of get_absolute_url is used.
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Raises ImproperlyConfigured if no url can be found.
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"""
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if url_name:
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value = reverse(url_name, args=args or [])
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elif url:
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value = url
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else:
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try:
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if use_absolute_url_link is None:
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value = self.object.get_absolute_url()
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else:
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value = self.object.get_absolute_url(use_absolute_url_link)
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except AttributeError:
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raise ImproperlyConfigured(
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'No url to redirect to. See openslides.utils.views.UrlMixin '
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'for more details.')
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return value
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def get_url_name_args(self):
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"""
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Returns the arguments for the url name.
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Default is an empty list or [self.object.pk] if this exist.
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"""
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if self.url_name_args is not None:
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value = self.url_name_args
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else:
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try:
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pk = self.object.pk
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except AttributeError:
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value = []
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else:
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if pk:
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value = [pk]
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else:
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value = []
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return value
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class FormMixin(UrlMixin):
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"""
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Mixin for views with forms.
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"""
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use_apply = True
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success_url_name = None
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success_url = None
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success_message = None
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apply_url_name = None
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apply_url = None
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error_message = ugettext_lazy('Please check the form for errors.')
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def get_apply_url(self):
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"""
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Returns the url when the user clicks on 'apply'.
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"""
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return self.get_url(self.apply_url_name, self.apply_url,
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args=self.get_url_name_args(),
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use_absolute_url_link='update')
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def get_success_url(self):
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"""
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Returns the url when the user submits a form.
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Redirects to get_apply_url if self.use_apply is True
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"""
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if self.use_apply and 'apply' in self.request.POST:
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value = self.get_apply_url()
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else:
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value = self.get_url(self.success_url_name, self.success_url,
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args=self.get_url_name_args())
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return value
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def form_valid(self, form):
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value = super(FormMixin, self).form_valid(form)
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messages.success(self.request, self.get_success_message())
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return value
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def form_invalid(self, form):
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value = super(FormMixin, self).form_invalid(form)
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messages.error(self.request, self.get_error_message())
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return value
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def get_success_message(self):
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return self.success_message
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def get_error_message(self):
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return self.error_message
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class ModelFormMixin(FormMixin):
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"""
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Mixin for FormViews.
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"""
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def form_valid(self, form):
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"""
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Called if the form is valid.
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1. saves the form into the model,
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2. calls 'self.manipulate_object,
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3. saves the object in the database,
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4. calls self.post_save.
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"""
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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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self.post_save(form)
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messages.success(self.request, self.get_success_message())
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return HttpResponseRedirect(self.get_success_url())
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def manipulate_object(self, form):
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"""
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Called before the object is saved into the database.
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"""
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pass
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def post_save(self, form):
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"""
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Called after the object is saved into the database.
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"""
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form.save_m2m()
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class TemplateView(PermissionMixin, ExtraContextMixin, django_views.TemplateView):
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"""
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View to return with an template.
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"""
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pass
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class ListView(PermissionMixin, ExtraContextMixin, django_views.ListView):
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"""
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View to show a list of model objects.
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"""
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pass
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class AjaxView(PermissionMixin, AjaxMixin, View):
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"""
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View for ajax requests.
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"""
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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, UrlMixin, django_views.RedirectView):
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"""
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View to redirect to another url.
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The initial value of url_name_args is None, but the default given by
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the used get_url_name_args method is [self.object.pk] if it exist, else
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an empty list. Set url_name_args to an empty list, if you use an url
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name which does not need any arguments.
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"""
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permanent = False
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allow_ajax = False
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url_name = None
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def pre_redirect(self, request, *args, **kwargs):
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"""
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Called before the redirect.
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"""
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# TODO: Also call this method on post-request.
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# Add pre_get_redirect for get requests.
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pass
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def pre_post_redirect(self, request, *args, **kwargs):
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"""
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Called before the redirect, if it is a post request.
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"""
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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 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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"""
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Returns the url to which the redirect should go.
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"""
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return self.get_url(self.url_name, self.url,
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args=self.get_url_name_args())
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class QuestionView(RedirectView):
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"""
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Mixin for questions to the requesting user.
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The BaseView has to be a RedirectView.
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"""
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question_message = ugettext_lazy('Are you sure?')
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final_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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question_url_name = None
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question_url = None
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def get_redirect_url(self, **kwargs):
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"""
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Returns the url to which the view should redirect.
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"""
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if self.request.method == 'GET':
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url = self.get_url(self.question_url_name, self.question_url,
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args=self.get_url_name_args())
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else:
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url = super(QuestionView, self).get_redirect_url()
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return url
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def pre_redirect(self, request, *args, **kwargs):
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"""
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Prints the question in a GET request.
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"""
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self.confirm_form()
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def get_question_message(self):
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"""
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Returns the question.
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"""
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return unicode(self.question_message)
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def get_answer_options(self):
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"""
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Returns the possible answers.
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This is a list of tubles. The first element of the tuble is the key,
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the second element is shown to the user.
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"""
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return self.answer_options
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def confirm_form(self):
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"""
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Returns the form to show in the message.
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"""
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option_fields = "\n".join([
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'<button type="submit" class="btn btn-mini" name="%s">%s</button>'
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% (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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'%(message)s<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</form>' % {
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'message': self.get_question_message(),
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'url': self.request.path,
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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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"""
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Calls the method for the answer the user clicked.
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The method name is on_clicked_ANSWER where ANSWER is the key from
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the clicked answer. See get_answer_options. Prints an error
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message, if no valid answer was given. If this method is not
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defined, nothing happens, else it is called and the success message
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is printed to the user.
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"""
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try:
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answer = self.get_answer()
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except OpenSlidesError as error:
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messages.error(self.request, error)
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else:
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method_name = 'on_clicked_%s' % answer
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method = getattr(self, method_name, None)
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if method is None:
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pass
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else:
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method()
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self.create_final_message()
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def get_answer(self):
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"""
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Returns the key of the clicked answer.
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Raises OpenSlidesError if the answer is not one of get_answer_options.
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"""
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for option_key, option_name in self.get_answer_options():
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if option_key in self.request.POST:
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answer = option_key
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break
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else:
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raise OpenSlidesError(ugettext_lazy('You did not send a valid answer.'))
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return answer
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def get_final_message(self):
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"""
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Returns the message to show after the action.
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Uses the attribute 'final_messsage' as default
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"""
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return self.final_message
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def create_final_message(self):
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"""
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Creates a message.
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"""
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messages.success(self.request, self.get_final_message())
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class FormView(PermissionMixin, ExtraContextMixin, FormMixin,
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django_views.FormView):
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"""
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View for forms.
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"""
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pass
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class UpdateView(PermissionMixin, ExtraContextMixin,
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ModelFormMixin, django_views.UpdateView):
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"""
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View to update an model object.
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"""
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def get_success_message(self):
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if self.success_message is None:
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message = _('%s was successfully modified.') % html_strong(self.object)
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else:
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message = self.success_message
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return message
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class CreateView(PermissionMixin, ExtraContextMixin,
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ModelFormMixin, django_views.CreateView):
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"""
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View to create a model object.
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"""
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def get_success_message(self):
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if self.success_message is None:
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message = _('%s was successfully created.') % html_strong(self.object)
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else:
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message = self.success_message
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return message
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class DeleteView(SingleObjectMixin, QuestionView):
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"""
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View to delete an model object.
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"""
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success_url = None
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success_url_name = None
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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_redirect_url(self, **kwargs):
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"""
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Returns the url on which the delete dialog is shown and the url after
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the deleting.
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On GET-requests and on aborted or failed POST-requests, redirects to the detail
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view as default. The attributes question_url_name or question_url can
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define other urls.
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"""
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if self.request.method == 'POST':
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try:
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answer = self.get_answer()
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except OpenSlidesError:
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answer = 'no'
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if answer == 'no':
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url = self.get_url(self.question_url_name, self.question_url,
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args=self.get_url_name_args())
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else:
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url = self.get_url(self.success_url_name, self.success_url,
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args=self.get_url_name_args())
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else:
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url = self.get_url(self.question_url_name, self.question_url,
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args=self.get_url_name_args())
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return url
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def get_question_message(self):
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"""
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Returns the question for the delete dialog.
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"""
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return _('Do you really want to delete %s?') % html_strong(self.object)
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def on_clicked_yes(self):
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"""
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Deletes the object.
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"""
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self.object.delete()
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def get_final_message(self):
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"""
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Prints the success message to the user.
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"""
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return _('%s was successfully deleted.') % html_strong(self.object)
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class DetailView(PermissionMixin, ExtraContextMixin, django_views.DetailView):
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"""
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View to show an model object.
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"""
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pass
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class PDFView(PermissionMixin, View):
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"""
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View to generate an PDF.
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"""
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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()
|
|
story = [Spacer(1, self.get_top_space() * cm)]
|
|
|
|
self.append_to_pdf(story)
|
|
|
|
self.build_document(pdf_document, story)
|
|
|
|
pdf = buffer.getvalue()
|
|
buffer.close()
|
|
response.write(pdf)
|
|
return response
|
|
|
|
def get(self, request, *args, **kwargs):
|
|
return self.render_to_response(self.get_filename())
|