Repository: home-assistant/core
File: homeassistant/helpers/config_entry_oauth2_flow.py (Python)

Code before:
    async def async_resolve_external_data(self, external_data: Any) -> dict:
        """Resolve the authorization code to tokens."""
        request_data: dict = {
            "grant_type": "authorization_code",
            "code": external_data["code"],
            "redirect_uri": external_data["state"]["redirect_uri"],
        }
        request_data.update(self.extra_token_resolve_data)
        return await self._token_request(request_data)

    async def _async_refresh_token(self, token: dict) -> dict:
        """Refresh a token.

        Raises OAuth2RefreshTokenError on token refresh failure.
        """
        try:
            new_token = await self._token_request(
                {
                    "grant_type": "refresh_token",
                    "client_id": self.client_id,
                    "refresh_token": token["refresh_token"],
                }
            )
        except ClientResponseError as err:
            report_usage(
                "is using the `OAuth2 config entry helper` and this can now throw `OAuth2RefreshTokenError` exceptions. "
                "It can be a recoverable or non-recoverable error based on the "
                "HTTP status code. Please update your integration to handle "
                "`OAuth2RefreshTokenError` gracefully (see "
                "https://developers.home-assistant.io)",
                breaks_in_ha_version="2026.8",
                core_behavior=ReportBehavior.LOG,
                integration_domain=self._domain,
            )

            if err.status == HTTPStatus.TOO_MANY_REQUESTS or 500 <= err.status <= 599:
                # Recoverable error
                raise OAuth2RefreshTokenTransientError(
                    request_info=err.request_info,
                    history=err.history,
                    status=err.status,
                    message=err.message,
                    headers=err.headers,
                    domain=self._domain,
                ) from err
            if 400 <= err.status <= 499:
                # Non-recoverable error
                raise OAuth2RefreshTokenReauthError(
                    request_info=err.request_info,
                    history=err.history,
                    status=err.status,

Review comment (security):
```suggestion
                "is using the `OAuth2 config entry helper` "
                "without handling `OAuth2RefreshTokenError`. "
```

Code after:
        """Resolve the authorization code to tokens."""
        request_data: dict = {
            "grant_type": "authorization_code",
            "code": external_data["code"],
            "redirect_uri": external_data["state"]["redirect_uri"],
        }
        request_data.update(self.extra_token_resolve_data)
        return await self._token_request(request_data)

    async def _async_refresh_token(self, token: dict) -> dict:
        """Refresh a token."""

        new_token = await self._token_request(
            {
                "grant_type": "refresh_token",
                "client_id": self.client_id,
                "refresh_token": token["refresh_token"],
            }
        )

        return {**token, **new_token}

    async def _token_request(self, data: dict) -> dict:
        """Make a token request.

        Raises OAuth2TokenRequestError on token request failure.
        """
        session = async_get_clientsession(self.hass)

        data["client_id"] = self.client_id
        if self.client_secret:
            data["client_secret"] = self.client_secret

        _LOGGER.debug("Sending token request to %s", self.token_url)

        try:
            resp = await session.post(self.token_url, data=data)
            if resp.status >= 400:
                try:
                    error_response = await resp.json()
                except ClientError, JSONDecodeError:
                    error_response = {}
                error_code = error_response.get("error", "unknown")
                error_description = error_response.get(
                    "error_description", "unknown error"
                )
                _LOGGER.error(
                    "Token request for %s failed (%s): %s",
                    self.domain,
                    error_code,
                    error_description,