decode.py

#!/usr/bin/env python3

# uv venv && source .venv/bin/activate
# uv pip install -U requests multidict phonenumbers

from urllib.parse import urlparse, parse_qs
import requests
import phonenumbers as pn
from multidict import MultiDict

import sys

REGION_CODE_TO_COUNTRY_CODE = MultiDict()
for code, countries in pn.COUNTRY_CODE_TO_REGION_CODE.items():
    for c in countries:
        REGION_CODE_TO_COUNTRY_CODE[c] = code


def get_country_code() -> int:
    r = requests.get("https://api.country.is")
    r.raise_for_status()

    region_code = r.json()["country"]

    return REGION_CODE_TO_COUNTRY_CODE[region_code]


if __name__ == "__main__":
    url = sys.argv[1].replace("&", "?")

    u = urlparse(url)

    print(f"Phone number: +{get_country_code()}{u.netloc}")
    print(f"Message: {parse_qs(u.query)['body'][0]}")