Django将/None附加到url

Question

我正在为用户创建一个将帖子保存为最喜欢的逻辑，我完成了创建，但当我header到urlhttp://127.0.0.1:8000/design/ui-ux/learn-ui-the-easy-way/save/时，它会自动刷新它自己，现在将None附加到url，如http://127.0.0.1:8000/design/ui-ux/learn-ui-the-easy-way/save/None，这不是我所期望的。

views.py

@login_required
def designtut_favourite(request, designcat_slug, design_slug):
user = request.user
designtut = DesignTutorial.objects.get(slug=design_slug)
profile = Profile.objects.get(user=user)
if profile.favourite_design.filter(slug=design_slug).exists():
profile.favourite_design.remove(designtut)
else:
profile.favourite_design.add(designtut)
return HttpResponseRedirect(request.META.get('HTTP_REFERER'))

models.py

class Profile(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
favourite_design = models.ManyToManyField(DesignTutorial)

urls . py

path('design/<designcat_slug>/<design_slug>/save/', views.designtut_favourite, name="design-save"),

template.html

<a href="{% url 'base:design-save' designtut.designcat.slug designtut.slug %}"><i class="fas fa-heart" "></i><span>Save</span></a>

Answer 1

views.py

from urllib.parse import urlparse
# import ALLOWED_HOSTS from your settings.py here!

@login_required
def designtut_favourite(request, designcat_slug, design_slug):
user = request.user
designtut = DesignTutorial.objects.get(slug=design_slug)
profile = Profile.objects.get(user=user)
if profile.favourite_design.filter(slug=design_slug).exists():
profile.favourite_design.remove(designtut)
else:
profile.favourite_design.add(designtut)
net_location = urlparse(request.META.get('HTTP_REFERER')).netloc
for allowed_host in ALLOWED_HOSTS:
if net_location in allowed_host:
return HttpResponseRedirect(request.META.get('HTTP_REFERER'))
return HttpResponseRedirect("/")

需要注意的是，盲目重定向到请求中给定的站点会带来安全风险。因此，我尝试与ALLOWED_HOSTS进行检查。这应该重定向到登陆页面，如果它有一个None值，但也如果有人被引诱到一个钓鱼网站。