mirror of
https://github.com/Garmelon/PFERD.git
synced 2023-12-21 10:23:01 +01:00
93 lines
2.5 KiB
Python
93 lines
2.5 KiB
Python
"""Contains a downloader for ILIAS."""
|
|
|
|
import datetime
|
|
from dataclasses import dataclass
|
|
from pathlib import Path
|
|
from typing import List
|
|
|
|
import bs4
|
|
import requests
|
|
|
|
from ..organizer import Organizer
|
|
from ..tmp_dir import TmpDir
|
|
from ..transform import Transformable
|
|
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."""
|
|
|
|
|
|
@dataclass
|
|
class IliasDownloadInfo(Transformable):
|
|
"""
|
|
This class describes a single file to be downloaded.
|
|
"""
|
|
|
|
url: str
|
|
modification_date: datetime.datetime
|
|
# parameters: Dict[str, Any] = field(default_factory=dict)
|
|
|
|
|
|
class IliasDownloader:
|
|
"""A downloader for ILIAS."""
|
|
|
|
def __init__(
|
|
self,
|
|
tmp_dir: TmpDir,
|
|
organizer: Organizer,
|
|
session: requests.Session,
|
|
authenticator: IliasAuthenticator,
|
|
):
|
|
"""
|
|
Create a new IliasDownloader.
|
|
"""
|
|
|
|
self._tmp_dir = tmp_dir
|
|
self._organizer = organizer
|
|
self._session = session
|
|
self._authenticator = authenticator
|
|
|
|
def download_all(self, infos: List[IliasDownloadInfo]) -> None:
|
|
"""
|
|
Download multiple files one after the other.
|
|
"""
|
|
|
|
for info in infos:
|
|
self.download(info)
|
|
|
|
def download(self, info: IliasDownloadInfo) -> None:
|
|
"""
|
|
Download a file from ILIAS.
|
|
|
|
Retries authentication until eternity if it could not fetch the file.
|
|
"""
|
|
|
|
tmp_file = self._tmp_dir.new_path()
|
|
|
|
while not self._try_download(info, tmp_file):
|
|
self._authenticator.authenticate(self._session)
|
|
|
|
self._organizer.accept_file(tmp_file, info.path)
|
|
|
|
def _try_download(self, info: IliasDownloadInfo, target: Path) -> bool:
|
|
with self._session.get(info.url, stream=True) as response:
|
|
content_type = response.headers["content-type"]
|
|
|
|
if content_type.startswith("text/html"):
|
|
# Dangit, we're probably not logged in.
|
|
if self._is_logged_in(soupify(response)):
|
|
raise ContentTypeException("Attempting to download a web page, not a file")
|
|
|
|
return False
|
|
|
|
# Yay, we got the file :)
|
|
stream_to_path(response, target)
|
|
return True
|
|
|
|
@staticmethod
|
|
def _is_logged_in(soup: bs4.BeautifulSoup) -> bool:
|
|
userlog = soup.find("li", {"id": "userlog"})
|
|
return userlog is not None
|