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362 lines
13 KiB
Python
362 lines
13 KiB
Python
from urllib.parse import urlparse, urlunparse
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from django.conf import settings
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# Avoid shadowing the login() and logout() views below.
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from django.contrib.auth import (
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REDIRECT_FIELD_NAME, get_user_model, login as auth_login,
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logout as auth_logout, update_session_auth_hash,
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)
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from django.contrib.auth.decorators import login_required
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from django.contrib.auth.forms import (
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AuthenticationForm, PasswordChangeForm, PasswordResetForm, SetPasswordForm,
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)
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from django.contrib.auth.tokens import default_token_generator
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from django.contrib.sites.shortcuts import get_current_site
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from django.core.exceptions import ValidationError
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from django.http import HttpResponseRedirect, QueryDict
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from django.shortcuts import resolve_url
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from django.urls import reverse_lazy
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from django.utils.decorators import method_decorator
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from django.utils.http import (
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url_has_allowed_host_and_scheme, urlsafe_base64_decode,
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)
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from django.utils.translation import gettext_lazy as _
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from django.views.decorators.cache import never_cache
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from django.views.decorators.csrf import csrf_protect
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from django.views.decorators.debug import sensitive_post_parameters
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from django.views.generic.base import TemplateView
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from django.views.generic.edit import FormView
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UserModel = get_user_model()
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class SuccessURLAllowedHostsMixin:
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success_url_allowed_hosts = set()
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def get_success_url_allowed_hosts(self):
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return {self.request.get_host(), *self.success_url_allowed_hosts}
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class LoginView(SuccessURLAllowedHostsMixin, FormView):
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"""
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Display the login form and handle the login action.
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"""
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form_class = AuthenticationForm
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authentication_form = None
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redirect_field_name = REDIRECT_FIELD_NAME
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template_name = 'registration/login.html'
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redirect_authenticated_user = False
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extra_context = None
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@method_decorator(sensitive_post_parameters())
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@method_decorator(csrf_protect)
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@method_decorator(never_cache)
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def dispatch(self, request, *args, **kwargs):
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if self.redirect_authenticated_user and self.request.user.is_authenticated:
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redirect_to = self.get_success_url()
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if redirect_to == self.request.path:
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raise ValueError(
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"Redirection loop for authenticated user detected. Check that "
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"your LOGIN_REDIRECT_URL doesn't point to a login page."
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)
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return HttpResponseRedirect(redirect_to)
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return super().dispatch(request, *args, **kwargs)
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def get_success_url(self):
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url = self.get_redirect_url()
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return url or resolve_url(settings.LOGIN_REDIRECT_URL)
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def get_redirect_url(self):
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"""Return the user-originating redirect URL if it's safe."""
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redirect_to = self.request.POST.get(
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self.redirect_field_name,
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self.request.GET.get(self.redirect_field_name, '')
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)
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url_is_safe = url_has_allowed_host_and_scheme(
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url=redirect_to,
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allowed_hosts=self.get_success_url_allowed_hosts(),
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require_https=self.request.is_secure(),
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)
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return redirect_to if url_is_safe else ''
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def get_form_class(self):
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return self.authentication_form or self.form_class
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def get_form_kwargs(self):
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kwargs = super().get_form_kwargs()
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kwargs['request'] = self.request
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return kwargs
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def form_valid(self, form):
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"""Security check complete. Log the user in."""
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auth_login(self.request, form.get_user())
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return HttpResponseRedirect(self.get_success_url())
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def get_context_data(self, **kwargs):
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context = super().get_context_data(**kwargs)
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current_site = get_current_site(self.request)
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context.update({
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self.redirect_field_name: self.get_redirect_url(),
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'site': current_site,
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'site_name': current_site.name,
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**(self.extra_context or {})
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})
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return context
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class LogoutView(SuccessURLAllowedHostsMixin, TemplateView):
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"""
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Log out the user and display the 'You are logged out' message.
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"""
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next_page = None
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redirect_field_name = REDIRECT_FIELD_NAME
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template_name = 'registration/logged_out.html'
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extra_context = None
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@method_decorator(never_cache)
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def dispatch(self, request, *args, **kwargs):
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auth_logout(request)
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next_page = self.get_next_page()
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if next_page:
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# Redirect to this page until the session has been cleared.
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return HttpResponseRedirect(next_page)
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return super().dispatch(request, *args, **kwargs)
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def post(self, request, *args, **kwargs):
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"""Logout may be done via POST."""
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return self.get(request, *args, **kwargs)
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def get_next_page(self):
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if self.next_page is not None:
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next_page = resolve_url(self.next_page)
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elif settings.LOGOUT_REDIRECT_URL:
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next_page = resolve_url(settings.LOGOUT_REDIRECT_URL)
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else:
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next_page = self.next_page
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if (self.redirect_field_name in self.request.POST or
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self.redirect_field_name in self.request.GET):
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next_page = self.request.POST.get(
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self.redirect_field_name,
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self.request.GET.get(self.redirect_field_name)
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)
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url_is_safe = url_has_allowed_host_and_scheme(
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url=next_page,
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allowed_hosts=self.get_success_url_allowed_hosts(),
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require_https=self.request.is_secure(),
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)
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# Security check -- Ensure the user-originating redirection URL is
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# safe.
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if not url_is_safe:
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next_page = self.request.path
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return next_page
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def get_context_data(self, **kwargs):
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context = super().get_context_data(**kwargs)
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current_site = get_current_site(self.request)
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context.update({
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'site': current_site,
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'site_name': current_site.name,
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'title': _('Logged out'),
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**(self.extra_context or {})
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})
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return context
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def logout_then_login(request, login_url=None):
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"""
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Log out the user if they are logged in. Then redirect to the login page.
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"""
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login_url = resolve_url(login_url or settings.LOGIN_URL)
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return LogoutView.as_view(next_page=login_url)(request)
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def redirect_to_login(next, login_url=None, redirect_field_name=REDIRECT_FIELD_NAME):
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"""
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Redirect the user to the login page, passing the given 'next' page.
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"""
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resolved_url = resolve_url(login_url or settings.LOGIN_URL)
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login_url_parts = list(urlparse(resolved_url))
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if redirect_field_name:
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querystring = QueryDict(login_url_parts[4], mutable=True)
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querystring[redirect_field_name] = next
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login_url_parts[4] = querystring.urlencode(safe='/')
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return HttpResponseRedirect(urlunparse(login_url_parts))
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# Class-based password reset views
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# - PasswordResetView sends the mail
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# - PasswordResetDoneView shows a success message for the above
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# - PasswordResetConfirmView checks the link the user clicked and
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# prompts for a new password
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# - PasswordResetCompleteView shows a success message for the above
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class PasswordContextMixin:
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extra_context = None
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def get_context_data(self, **kwargs):
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context = super().get_context_data(**kwargs)
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context.update({
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'title': self.title,
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**(self.extra_context or {})
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})
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return context
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class PasswordResetView(PasswordContextMixin, FormView):
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email_template_name = 'registration/password_reset_email.html'
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extra_email_context = None
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form_class = PasswordResetForm
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from_email = None
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html_email_template_name = None
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subject_template_name = 'registration/password_reset_subject.txt'
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success_url = reverse_lazy('password_reset_done')
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template_name = 'registration/password_reset_form.html'
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title = _('Password reset')
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token_generator = default_token_generator
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@method_decorator(csrf_protect)
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def dispatch(self, *args, **kwargs):
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return super().dispatch(*args, **kwargs)
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def form_valid(self, form):
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opts = {
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'use_https': self.request.is_secure(),
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'token_generator': self.token_generator,
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'from_email': self.from_email,
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'email_template_name': self.email_template_name,
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'subject_template_name': self.subject_template_name,
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'request': self.request,
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'html_email_template_name': self.html_email_template_name,
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'extra_email_context': self.extra_email_context,
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}
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form.save(**opts)
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return super().form_valid(form)
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INTERNAL_RESET_SESSION_TOKEN = '_password_reset_token'
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class PasswordResetDoneView(PasswordContextMixin, TemplateView):
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template_name = 'registration/password_reset_done.html'
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title = _('Password reset sent')
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class PasswordResetConfirmView(PasswordContextMixin, FormView):
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form_class = SetPasswordForm
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post_reset_login = False
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post_reset_login_backend = None
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reset_url_token = 'set-password'
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success_url = reverse_lazy('password_reset_complete')
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template_name = 'registration/password_reset_confirm.html'
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title = _('Enter new password')
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token_generator = default_token_generator
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@method_decorator(sensitive_post_parameters())
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@method_decorator(never_cache)
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def dispatch(self, *args, **kwargs):
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assert 'uidb64' in kwargs and 'token' in kwargs
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self.validlink = False
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self.user = self.get_user(kwargs['uidb64'])
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if self.user is not None:
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token = kwargs['token']
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if token == self.reset_url_token:
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session_token = self.request.session.get(INTERNAL_RESET_SESSION_TOKEN)
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if self.token_generator.check_token(self.user, session_token):
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# If the token is valid, display the password reset form.
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self.validlink = True
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return super().dispatch(*args, **kwargs)
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else:
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if self.token_generator.check_token(self.user, token):
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# Store the token in the session and redirect to the
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# password reset form at a URL without the token. That
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# avoids the possibility of leaking the token in the
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# HTTP Referer header.
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self.request.session[INTERNAL_RESET_SESSION_TOKEN] = token
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redirect_url = self.request.path.replace(token, self.reset_url_token)
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return HttpResponseRedirect(redirect_url)
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# Display the "Password reset unsuccessful" page.
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return self.render_to_response(self.get_context_data())
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def get_user(self, uidb64):
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try:
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# urlsafe_base64_decode() decodes to bytestring
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uid = urlsafe_base64_decode(uidb64).decode()
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user = UserModel._default_manager.get(pk=uid)
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except (TypeError, ValueError, OverflowError, UserModel.DoesNotExist, ValidationError):
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user = None
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return user
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def get_form_kwargs(self):
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kwargs = super().get_form_kwargs()
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kwargs['user'] = self.user
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return kwargs
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def form_valid(self, form):
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user = form.save()
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del self.request.session[INTERNAL_RESET_SESSION_TOKEN]
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if self.post_reset_login:
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auth_login(self.request, user, self.post_reset_login_backend)
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return super().form_valid(form)
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def get_context_data(self, **kwargs):
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context = super().get_context_data(**kwargs)
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if self.validlink:
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context['validlink'] = True
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else:
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context.update({
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'form': None,
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'title': _('Password reset unsuccessful'),
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'validlink': False,
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})
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return context
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class PasswordResetCompleteView(PasswordContextMixin, TemplateView):
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template_name = 'registration/password_reset_complete.html'
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title = _('Password reset complete')
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def get_context_data(self, **kwargs):
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context = super().get_context_data(**kwargs)
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context['login_url'] = resolve_url(settings.LOGIN_URL)
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return context
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class PasswordChangeView(PasswordContextMixin, FormView):
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form_class = PasswordChangeForm
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success_url = reverse_lazy('password_change_done')
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template_name = 'registration/password_change_form.html'
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title = _('Password change')
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@method_decorator(sensitive_post_parameters())
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@method_decorator(csrf_protect)
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@method_decorator(login_required)
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def dispatch(self, *args, **kwargs):
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return super().dispatch(*args, **kwargs)
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def get_form_kwargs(self):
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kwargs = super().get_form_kwargs()
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kwargs['user'] = self.request.user
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return kwargs
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def form_valid(self, form):
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form.save()
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# Updating the password logs out all other sessions for the user
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# except the current one.
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update_session_auth_hash(self.request, form.user)
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return super().form_valid(form)
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class PasswordChangeDoneView(PasswordContextMixin, TemplateView):
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template_name = 'registration/password_change_done.html'
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title = _('Password change successful')
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@method_decorator(login_required)
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def dispatch(self, *args, **kwargs):
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return super().dispatch(*args, **kwargs)
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