mirror of
https://github.com/Garmelon/PFERD.git
synced 2023-12-21 10:23:01 +01:00
67 lines
2.1 KiB
Python
67 lines
2.1 KiB
Python
"""Contains a downloader for ILIAS."""
|
|
|
|
from pathlib import Path
|
|
from typing import Any, Dict
|
|
|
|
import bs4
|
|
import requests
|
|
|
|
from ..organizer import Organizer
|
|
from ..tmp_dir import TmpDir
|
|
from ..utils import soupify, stream_to_path
|
|
from .authenticators import IliasAuthenticator
|
|
|
|
|
|
class ContentTypeException(Exception):
|
|
"""Thrown when the content type of the ilias element can not be handled."""
|
|
|
|
def __init__(self, message: str):
|
|
"""Create a new exception."""
|
|
super().__init__(message)
|
|
|
|
|
|
class IliasDownloader():
|
|
"""A downloader for ILIAS."""
|
|
|
|
def __init__(self, tmp_dir: TmpDir, organizer: Organizer, authenticator: IliasAuthenticator):
|
|
"""Create a new IliasDownloader."""
|
|
self._authenticator = authenticator
|
|
self._session = requests.Session()
|
|
self._tmp_dir = tmp_dir
|
|
self._organizer = organizer
|
|
|
|
def download(self, url: str, target_path: Path, params: Dict[str, Any]) -> None:
|
|
"""Download a file from ILIAS.
|
|
|
|
Retries authentication until eternity, if it could not fetch the file.
|
|
"""
|
|
tmp_file = self._tmp_dir.new_file()
|
|
|
|
while not self._try_download(url, tmp_file, params):
|
|
self._authenticator.authenticate(self._session)
|
|
|
|
self._organizer.accept_file(tmp_file, target_path)
|
|
|
|
def _try_download(self, url: str, target_path: Path, params: Dict[str, Any]) -> bool:
|
|
with self._session.get(url, params=params, stream=True) as r:
|
|
content_type = r.headers["content-type"]
|
|
|
|
if content_type.startswith("text/html"):
|
|
# Dangit, we're probably not logged in.
|
|
soup = soupify(r)
|
|
|
|
if self._is_logged_in(soup):
|
|
raise ContentTypeException(
|
|
"Attempting to download a web page, not a file"
|
|
)
|
|
|
|
return False
|
|
else:
|
|
# Yay, we got the file :)
|
|
stream_to_path(r, target_path)
|
|
return True
|
|
|
|
def _is_logged_in(self, soup: Any) -> bool:
|
|
userlog = soup.find("li", {"id": "userlog"})
|
|
return userlog is not None
|