from json import loads
from bottle import request


def read_keys_from_request(keys: None|dict = None):
    result = {}
    try:
        body = request.body.read()
        data = loads(body.decode('utf-8'))
    except:
        return result
    if keys:
        missing_keys = [key for key in keys if key not in data]
        if missing_keys:
            raise ValueError(f"Missing required keys: {', '.join(missing_keys)}")
        data = {key: data[key] for key in keys}
    return data