105 lines
3 KiB
Python
105 lines
3 KiB
Python
from django.contrib.auth.decorators import login_required
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from django.db import IntegrityError
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from django.db.models import F
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from django.http import (
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Http404,
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HttpResponse,
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HttpResponseBadRequest,
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HttpResponseForbidden,
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)
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from django.utils.translation import gettext as _
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from judge.models.pagevote import PageVote, PageVoteVoter
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from django.views.generic.base import TemplateResponseMixin
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from django.views.generic.detail import SingleObjectMixin
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from judge.dblock import LockModel
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from django.views.generic import View, ListView
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__all__ = [
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"upvote_page",
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"downvote_page",
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"PageVoteDetailView",
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"PageVoteListView",
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]
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@login_required
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def vote_page(request, delta):
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if abs(delta) != 1:
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return HttpResponseBadRequest(
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_("Messing around, are we?"), content_type="text/plain"
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)
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if request.method != "POST":
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return HttpResponseForbidden()
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if "id" not in request.POST:
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return HttpResponseBadRequest()
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if (
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not request.user.is_staff
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and not request.profile.submission_set.filter(
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points=F("problem__points")
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).exists()
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):
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return HttpResponseBadRequest(
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_("You must solve at least one problem before you can vote."),
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content_type="text/plain",
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)
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try:
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pagevote_id = int(request.POST["id"])
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except ValueError:
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return HttpResponseBadRequest()
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else:
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if not PageVote.objects.filter(id=pagevote_id).exists():
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raise Http404()
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vote = PageVoteVoter()
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vote.pagevote_id = pagevote_id
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vote.voter = request.profile
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vote.score = delta
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while True:
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try:
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vote.save()
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except IntegrityError:
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with LockModel(write=(PageVoteVoter,)):
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try:
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vote = PageVoteVoter.objects.get(
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pagevote_id=pagevote_id, voter=request.profile
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)
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except PageVoteVoter.DoesNotExist:
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# We must continue racing in case this is exploited to manipulate votes.
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continue
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vote.delete()
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PageVote.objects.filter(id=pagevote_id).update(
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score=F("score") - vote.score
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)
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else:
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PageVote.objects.filter(id=pagevote_id).update(score=F("score") + delta)
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break
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return HttpResponse("success", content_type="text/plain")
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def upvote_page(request):
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return vote_page(request, 1)
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def downvote_page(request):
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return vote_page(request, -1)
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class PageVoteDetailView(TemplateResponseMixin, SingleObjectMixin, View):
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pagevote_page = None
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def get_pagevote_page(self):
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if self.pagevote_page is None:
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raise NotImplementedError()
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return self.pagevote_page
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def get_context_data(self, **kwargs):
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context = super(PageVoteDetailView, self).get_context_data(**kwargs)
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context["pagevote"] = self.object.get_or_create_pagevote()
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return context
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