# -*- coding: utf-8 -*-

import json
from json.decoder import JSONDecodeError
import logging

import falcon


LOG = logging.getLogger(__name__)


def json_body(req: falcon.Request, *_) -> None:
    """Decode JSON request body and attach to request as `body`.

    :param req: The request to be processed
    :raises falcon.HTTPBadRequest: In the case of invalid JSON
    """
    body = req.bounded_stream.read().decode('utf-8')
    try:
        req.body = json.loads(body) if body else {}
    except JSONDecodeError as ex:
        raise falcon.HTTPBadRequest(
            code='BAD_JSON',
            description=str(ex))