Cloudflare obfuscated email decoder

decode_cf.py

def decode_cf_email(encoded: str) -> str:
    """Decode Cloudflare obfuscate email address.
    """
    def r(e: str, t: int):
        return int(e[t : t + 2], 16)

    def decode(n: str, offset: int)-> str:
        result = ""
        key = r(n, offset)
        for i in range(offset + 2, len(n), 2):
            char = r(n, i) ^ key
            result += chr(char)
        return result

    if encoded.startswith("/cdn-cgi/l/email-protection#"):
        encoded = encoded[len("/cdn-cgi/l/email-protection#") :]
        return decode(encoded, 0)
    else:
        raise ValueError("Invalid encoded email format")
        
#decode_cf_email("/cdn-cgi/l/email-protection#HEX_STR...")