Sith/core/views/files.py

# -*- coding:utf-8 -*
#
# Copyright 2016,2017
# - Skia <skia@libskia.so>
#
# Ce fichier fait partie du site de l'Association des Étudiants de l'UTBM,
# http://ae.utbm.fr.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License a published by the Free Software
# Foundation; either version 3 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Sofware Foundation, Inc., 59 Temple
# Place - Suite 330, Boston, MA 02111-1307, USA.
#
#

# This file contains all the views that concern the page model
from django.shortcuts import render, redirect, get_object_or_404
from django.views.generic import ListView, DetailView, TemplateView
from django.views.generic.edit import UpdateView, CreateView, FormMixin, DeleteView
from django.views.generic.detail import SingleObjectMixin
from django.contrib.auth.decorators import login_required, permission_required
from django.forms.models import modelform_factory
from django.forms import CheckboxSelectMultiple
from django.conf import settings
from django.utils.translation import ugettext_lazy as _
from django.http import HttpResponse
from django.core.servers.basehttp import FileWrapper
from django.core.urlresolvers import reverse
from django.core.exceptions import PermissionDenied, ObjectDoesNotExist
from django import forms

import os

from ajax_select import make_ajax_form, make_ajax_field

from core.models import SithFile, RealGroup, Notification
from core.views import CanViewMixin, CanEditMixin, CanEditPropMixin, CanCreateMixin, can_view, not_found
from counter.models import Counter

def send_file(request, file_id, file_class=SithFile, file_attr="file"):
    """
    Send a file through Django without loading the whole file into
    memory at once. The FileWrapper will turn the file object into an
    iterator for chunks of 8KB.
    """
    f = file_class.objects.filter(id=file_id).first()
    if f is None or not f.file:
        return not_found(request)
    if not (can_view(f, request.user) or
            ('counter_token' in request.session.keys() and
                request.session['counter_token'] and # check if not null for counters that have no token set
                Counter.objects.filter(token=request.session['counter_token']).exists())
            ):
        raise PermissionDenied
    name = f.__getattribute__(file_attr).name
    filepath = os.path.join(settings.MEDIA_ROOT, name)
    with open(filepath.encode('utf-8'), 'rb') as filename:
        wrapper = FileWrapper(filename)
        response = HttpResponse(wrapper, content_type=f.mime_type)
        response['Content-Length'] = os.path.getsize(filepath.encode('utf-8'))
        response['Content-Disposition'] = ('inline; filename="%s"' % f.name).encode('utf-8')
        return response

class AddFilesForm(forms.Form):
    folder_name = forms.CharField(label=_("Add a new folder"), max_length=30, required=False)
    file_field = forms.FileField(widget=forms.ClearableFileInput(attrs={'multiple': True}), label=_("Files"),
            required=False)

    def process(self, parent, owner, files):
        notif = False
        try:
            if self.cleaned_data['folder_name'] != "":
                folder = SithFile(parent=parent, name=self.cleaned_data['folder_name'], owner=owner)
                folder.clean()
                folder.save()
                notif = True
        except Exception as e:
            self.add_error(None, _("Error creating folder %(folder_name)s: %(msg)s") %
                    {'folder_name': self.cleaned_data['folder_name'], 'msg': repr(e)})
        for f in files:
            new_file = SithFile(parent=parent, name=f.name, file=f, owner=owner, is_folder=False,
                    mime_type=f.content_type, size=f._size)
            try:
                new_file.clean()
                new_file.save()
                notif = True
            except Exception as e:
                self.add_error(None, _("Error uploading file %(file_name)s: %(msg)s") % {'file_name': f, 'msg': repr(e)})
        if notif:
            for u in RealGroup.objects.filter(id=settings.SITH_GROUP_COM_ADMIN_ID).first().users.all():
                if not u.notifications.filter(type="FILE_MODERATION", viewed=False).exists():
                    Notification(user=u, url=reverse("core:file_moderation"), type="FILE_MODERATION").save()

class FileListView(ListView):
    template_name = 'core/file_list.jinja'
    context_object_name = "file_list"

    def get_queryset(self):
        return SithFile.objects.filter(parent=None)

    def get_context_data(self, **kwargs):
        kwargs = super(FileListView, self).get_context_data(**kwargs)
        kwargs['popup'] = ""
        if self.kwargs['popup']:
            kwargs['popup'] = 'popup'
        return kwargs

class FileEditView(CanEditMixin, UpdateView):
    model = SithFile
    pk_url_kwarg = "file_id"
    template_name = 'core/file_edit.jinja'
    context_object_name = "file"

    def get_form_class(self):
        fields = ['name', 'is_moderated']
        if self.object.is_file:
            fields = ['file'] + fields
        return modelform_factory(SithFile, fields=fields)

    def get_success_url(self):
        if self.kwargs['popup']:
            return reverse('core:file_detail', kwargs={'file_id': self.object.id, 'popup': "popup"})
        return reverse('core:file_detail', kwargs={'file_id': self.object.id, 'popup': ""})

    def get_context_data(self, **kwargs):
        kwargs = super(FileEditView, self).get_context_data(**kwargs)
        kwargs['popup'] = ""
        if self.kwargs['popup']:
            kwargs['popup'] = 'popup'
        return kwargs

class FileEditPropForm(forms.ModelForm):
    class Meta:
        model = SithFile
        fields = ['parent', 'owner', 'edit_groups', 'view_groups']
    parent = make_ajax_field(SithFile, 'parent', 'files', help_text="")
    edit_groups = make_ajax_field(SithFile, 'edit_groups', 'groups', help_text="", label=_("edit group"))
    view_groups = make_ajax_field(SithFile, 'view_groups', 'groups', help_text="", label=_("view group"))
    recursive = forms.BooleanField(label=_("Apply rights recursively"), required=False)

class FileEditPropView(CanEditPropMixin, UpdateView):
    model = SithFile
    pk_url_kwarg = "file_id"
    template_name = 'core/file_edit.jinja'
    context_object_name = "file"
    form_class = FileEditPropForm

    def get_form(self, form_class=None):
        form = super(FileEditPropView, self).get_form(form_class)
        form.fields['parent'].queryset = SithFile.objects.filter(is_folder=True)
        return form

    def form_valid(self, form):
        ret = super(FileEditPropView, self).form_valid(form)
        if form.cleaned_data['recursive']:
            self.object.apply_rights_recursively()
        return ret

    def get_success_url(self):
        return reverse('core:file_detail', kwargs={'file_id': self.object.id, 'popup': self.kwargs['popup'] or ""})

    def get_context_data(self, **kwargs):
        kwargs = super(FileEditPropView, self).get_context_data(**kwargs)
        kwargs['popup'] = ""
        if self.kwargs['popup']:
            kwargs['popup'] = 'popup'
        return kwargs

class FileView(CanViewMixin, DetailView, FormMixin):
    """This class handle the upload of new files into a folder"""
    model = SithFile
    pk_url_kwarg = "file_id"
    template_name = 'core/file_detail.jinja'
    context_object_name = "file"
    form_class = AddFilesForm

    def handle_clipboard(request, object):
        if 'delete' in request.POST.keys():
            for f_id in request.POST.getlist('file_list'):
                sf = SithFile.objects.filter(id=f_id).first()
                if sf:
                    sf.delete()
        if 'clear' in request.POST.keys():
            request.session['clipboard'] = []
        if 'cut' in request.POST.keys():
            for f_id in request.POST.getlist('file_list'):
                f_id = int(f_id)
                if f_id in [c.id for c in object.children.all()] and f_id not in request.session['clipboard']:
                    print(f_id)
                    request.session['clipboard'].append(f_id)
        if 'paste' in request.POST.keys():
            for f_id in request.session['clipboard']:
                sf = SithFile.objects.filter(id=f_id).first()
                if sf:
                    sf.move_to(object)
            request.session['clipboard'] = []
        request.session.modified = True

    def get(self, request, *args, **kwargs):
        self.form = self.get_form()
        if 'clipboard' not in request.session.keys():
            request.session['clipboard'] = []
        return super(FileView, self).get(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        if 'clipboard' not in request.session.keys():
            request.session['clipboard'] = []
        if request.user.can_edit(self.object):
            FileView.handle_clipboard(request, self.object)
        self.form = self.get_form() # The form handle only the file upload
        files = request.FILES.getlist('file_field')
        if request.user.is_authenticated() and request.user.can_edit(self.object) and self.form.is_valid():
            self.form.process(parent=self.object, owner=request.user, files=files)
            if self.form.is_valid():
                return super(FileView, self).form_valid(self.form)
        return self.form_invalid(self.form)

    def get_success_url(self):
        return reverse('core:file_detail', kwargs={'file_id': self.object.id, 'popup': self.kwargs['popup'] or ""})

    def get_context_data(self, **kwargs):
        kwargs = super(FileView, self).get_context_data(**kwargs)
        kwargs['popup'] = ""
        kwargs['form'] = self.form
        if self.kwargs['popup']:
            kwargs['popup'] = 'popup'
        kwargs['clipboard'] = SithFile.objects.filter(id__in=self.request.session['clipboard'])
        return kwargs

class FileDeleteView(CanEditPropMixin, DeleteView):
    model = SithFile
    pk_url_kwarg = "file_id"
    template_name = 'core/file_delete_confirm.jinja'
    context_object_name = "file"

    def get_success_url(self):
        self.object.file.delete() # Doing it here or overloading delete() is the same, so let's do it here
        if 'next' in self.request.GET.keys():
            return self.request.GET['next']
        if self.object.parent is None:
            return reverse('core:file_list', kwargs={'popup': self.kwargs['popup'] or ""})
        return reverse('core:file_detail', kwargs={'file_id': self.object.parent.id, 'popup': self.kwargs['popup'] or ""})

    def get_context_data(self, **kwargs):
        kwargs = super(FileDeleteView, self).get_context_data(**kwargs)
        kwargs['popup'] = ""
        if self.kwargs['popup']:
            kwargs['popup'] = 'popup'
        return kwargs

class FileModerationView(TemplateView):
    template_name = "core/file_moderation.jinja"

    def get_context_data(self, **kwargs):
        kwargs = super(FileModerationView, self).get_context_data(**kwargs)
        kwargs['files'] = SithFile.objects.filter(is_moderated=False)[:100]
        return kwargs

class FileModerateView(CanEditPropMixin, SingleObjectMixin):
    model = SithFile
    pk_url_kwarg = "file_id"

    def get(self, request, *args, **kwargs):
        self.object = self.get_object()
        self.object.is_moderated = True
        self.object.moderator = request.user
        self.object.save()
        if 'next' in self.request.GET.keys():
            return redirect(self.request.GET['next'])
        return redirect('core:file_moderation')