def transform_value()

in aws_lambda_powertools/utilities/parameters/base.py [0:0]

• 12 lines of code
• 5 McCabe index (conditional complexity)

def transform_value(value: str, transform: str, raise_on_transform_error: bool = True) -> Union[dict, bytes, None]:
    """
    Apply a transform to a value

    Parameters
    ---------
    value: str
        Parameter value to transform
    transform: str
        Type of transform, supported values are "json" and "binary"
    raise_on_transform_error: bool, optional
        Raises an exception if any transform fails, otherwise this will
        return a None value for each transform that failed

    Raises
    ------
    TransformParameterError:
        When the parameter value could not be transformed
    """

    try:
        if transform == TRANSFORM_METHOD_JSON:
            return json.loads(value)
        elif transform == TRANSFORM_METHOD_BINARY:
            return base64.b64decode(value)
        else:
            raise ValueError(f"Invalid transform type '{transform}'")

    except Exception as exc:
        if raise_on_transform_error:
            raise TransformParameterError(str(exc))
        return None