"""HTTP helper methods."""
from aiohttp import ClientSession

from jarvis_core.filters import url


async def get_size(link: str) -> int:
    """
    Get the url filesize.

    Args:
        link: URL to get

    Returns:
        Size in bytes

    Raises:
        Exception: On status code
        ValueError: On bad URL
    """
    if not url.match(link):
        raise ValueError("Invalid URL.")

    async with ClientSession() as session:
        resp = await session.get(link)
        resp.raise_for_status()
        return resp.content_length