def METHOD_NAME(self, request: Request) -> HttpResponse:
    user = auth.get_pending_2fa_user(request)
    if user is None:
        return HttpResponseRedirect(auth.get_login_url())
    interfaces = Authenticator.objects.all_interfaces_for_user(user)
    # If for whatever reason we ended up here but the user has no 2FA
    # enabled, we just continue successfully.
    if not interfaces:
        return self.perform_signin(request, user)
    challenge = activation = None
    interface = self.negotiate_interface(request, interfaces)
    if request.method == "POST" and ratelimiter.is_limited(
        f"auth-2fa:user:{user.id}", limit=5, window=60
    ):
        # TODO: Maybe email the account owner or do something to notify someone
        # This would probably be good for them to know.
        return HttpResponse(
            "You have made too many 2FA attempts. Please try again later.",
            content_type="text/plain",
            status=429,
        )
    if request.method == "GET":
        try:
            activation = interface.activate(request)
            if activation is not None and activation.type == "challenge":
                challenge = activation.challenge
                if interface.type == U2fInterface.type:
                    activation.challenge = {}
                    activation.challenge["webAuthnAuthenticationData"] = b64encode(challenge)
        except SMSRateLimitExceeded as e:
            logger.warning(
                "login.2fa.sms.rate-limited-exceeded",
                extra={
                    "remote_ip": f"{e.remote_ip}",
                    "user_id": f"{e.user_id}",
                    "phone_number": f"{e.phone_number}",
                },
            )
            return HttpResponse(
                "You have made too many 2FA attempts. Please try again later.",
                content_type="text/plain",
                status=429,
            )
    elif "challenge" in request.POST:
        challenge = json.loads(request.POST["challenge"])
    form = TwoFactorForm()
    # If an OTP response was supplied, we try to make it pass.
    otp = request.POST.get("otp")
    if otp:
        used_interface = self.validate_otp(otp, interface, interfaces)
        if used_interface is not None:
            return self.perform_signin(request, user, used_interface)
        self.fail_signin(request, user, form)
    #  If a challenge and response exists, validate
    if challenge:
        response = request.POST.get("response")
        if response:
            response = json.loads(response)
            if interface.validate_response(request, challenge, response):
                return self.perform_signin(request, user, interface)
            self.fail_signin(request, user, form)
    return render_to_response(
        ["sentry/twofactor_%s.html" % interface.interface_id, "sentry/twofactor.html"],
        {
            "form": form,
            "interface": interface,
            "other_interfaces": self.get_other_interfaces(interface, interfaces),
            "activation": activation,
        },
        request,
        status=200,
    )