src/Classes/Sanity.py

from telethon import TelegramClient
from aiohttp.web import Request


class Sanity:

    client: TelegramClient
    media = None
    chat_id: int
    file_id: int
    req: Request
    limit: int
    offset: int

    async def file_exists(self):
        try:
            self.media = await self.client.get_messages(
                entity=self.chat_id, ids=self.file_id
            )
            return self.media
        except Exception as e:
            pass

    def check_ranges(self):

        offset = self.req.http_range.start or 0

        limit = self.req.http_range.stop or self.media.file.size
        self.offset = offset
        self.limit = limit

        if (limit > self.media.file.size) or (offset < 0) or (limit < offset):

            return False
        else:

            return True