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venv/Lib/site-packages/django/contrib/auth/mixins.py

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+from urllib.parse import urlparse
+
+from django.conf import settings
+from django.contrib.auth import REDIRECT_FIELD_NAME
+from django.contrib.auth.views import redirect_to_login
+from django.core.exceptions import ImproperlyConfigured, PermissionDenied
+from django.shortcuts import resolve_url
+
+
+class AccessMixin:
+    """
+    Abstract CBV mixin that gives access mixins the same customizable
+    functionality.
+    """
+    login_url = None
+    permission_denied_message = ''
+    raise_exception = False
+    redirect_field_name = REDIRECT_FIELD_NAME
+
+    def get_login_url(self):
+        """
+        Override this method to override the login_url attribute.
+        """
+        login_url = self.login_url or settings.LOGIN_URL
+        if not login_url:
+            raise ImproperlyConfigured(
+                '{0} is missing the login_url attribute. Define {0}.login_url, settings.LOGIN_URL, or override '
+                '{0}.get_login_url().'.format(self.__class__.__name__)
+            )
+        return str(login_url)
+
+    def get_permission_denied_message(self):
+        """
+        Override this method to override the permission_denied_message attribute.
+        """
+        return self.permission_denied_message
+
+    def get_redirect_field_name(self):
+        """
+        Override this method to override the redirect_field_name attribute.
+        """
+        return self.redirect_field_name
+
+    def handle_no_permission(self):
+        if self.raise_exception or self.request.user.is_authenticated:
+            raise PermissionDenied(self.get_permission_denied_message())
+
+        path = self.request.build_absolute_uri()
+        resolved_login_url = resolve_url(self.get_login_url())
+        # If the login url is the same scheme and net location then use the
+        # path as the "next" url.
+        login_scheme, login_netloc = urlparse(resolved_login_url)[:2]
+        current_scheme, current_netloc = urlparse(path)[:2]
+        if (
+            (not login_scheme or login_scheme == current_scheme) and
+            (not login_netloc or login_netloc == current_netloc)
+        ):
+            path = self.request.get_full_path()
+        return redirect_to_login(
+            path,
+            resolved_login_url,
+            self.get_redirect_field_name(),
+        )
+
+
+class LoginRequiredMixin(AccessMixin):
+    """Verify that the current user is authenticated."""
+    def dispatch(self, request, *args, **kwargs):
+        if not request.user.is_authenticated:
+            return self.handle_no_permission()
+        return super().dispatch(request, *args, **kwargs)
+
+
+class PermissionRequiredMixin(AccessMixin):
+    """Verify that the current user has all specified permissions."""
+    permission_required = None
+
+    def get_permission_required(self):
+        """
+        Override this method to override the permission_required attribute.
+        Must return an iterable.
+        """
+        if self.permission_required is None:
+            raise ImproperlyConfigured(
+                '{0} is missing the permission_required attribute. Define {0}.permission_required, or override '
+                '{0}.get_permission_required().'.format(self.__class__.__name__)
+            )
+        if isinstance(self.permission_required, str):
+            perms = (self.permission_required,)
+        else:
+            perms = self.permission_required
+        return perms
+
+    def has_permission(self):
+        """
+        Override this method to customize the way permissions are checked.
+        """
+        perms = self.get_permission_required()
+        return self.request.user.has_perms(perms)
+
+    def dispatch(self, request, *args, **kwargs):
+        if not self.has_permission():
+            return self.handle_no_permission()
+        return super().dispatch(request, *args, **kwargs)
+
+
+class UserPassesTestMixin(AccessMixin):
+    """
+    Deny a request with a permission error if the test_func() method returns
+    False.
+    """
+
+    def test_func(self):
+        raise NotImplementedError(
+            '{} is missing the implementation of the test_func() method.'.format(self.__class__.__name__)
+        )
+
+    def get_test_func(self):
+        """
+        Override this method to use a different test_func method.
+        """
+        return self.test_func
+
+    def dispatch(self, request, *args, **kwargs):
+        user_test_result = self.get_test_func()()
+        if not user_test_result:
+            return self.handle_no_permission()
+        return super().dispatch(request, *args, **kwargs)