def _transform_replace_upper_and_lower_methods()

in src/jndi_deobfuscate/jndi_deobfuscate.py [0:0]

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

def _transform_replace_upper_and_lower_methods(input_string: str) -> str:
    """Given a string with Java lookup features using either upper() or lower() modifiers,
    deobfuscate the string by replacing those features with the appropriate text.
    """
    if input_string:
        result = re.search(SIMPLE_UPPER_LOWER_MODIFIER_REGEX_PATTERN, input_string)
        if result:

            full_variable = result.group(1)  # ${lower:TEXT_TO_LOWER}
            modifier = result.group(2)  # lower/upper
            text_to_modify = result.group(3)  # TEXT_TO_LOWER
            if modifier.lower() == "lower":
                modified_text = text_to_modify.lower()

            elif modifier.lower() == "upper":
                modified_text = text_to_modify.upper()
            else:
                logger.debug(
                    f"Upper/lower found unknown modifier: {modifier} in string {full_variable}"
                )

            output_string = input_string.replace(full_variable, modified_text)
            return output_string

        else:
            return input_string