Fixed #25142 -- Added PermissionRequiredMixin.has_permission() to allow customization.

            perms = self.permission_required

        return perms

    def dispatch(self, request, *args, **kwargs):

    def has_permission(self):

        """

        Override this method to customize the way permissions are checked.

        """

        perms = self.get_permission_required()

        if not request.user.has_perms(perms):

        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(PermissionRequiredMixin, self).dispatch(request, *args, **kwargs)

    :class:`~django.contrib.auth.mixins.AccessMixin` to customize the handling

    of unauthorized users.

    You may also override these methods:

    .. method:: get_permission_required()

        Returns an iterable of permission names used by the mixin. Defaults to

        the ``permission_required`` attribute, converted to a tuple if

        necessary.

    .. method:: has_permission()

        Returns a boolean denoting whether the current user has permission to

        execute the decorated view. By default, this returns the result of

        calling :meth:`~django.contrib.auth.models.User.has_perms()` with the

        list of permissions returned by :meth:`get_permission_required()`.

Redirecting unauthorized requests in class-based views

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