pferd/PFERD/ti.py
2019-07-26 10:06:01 +02:00

113 lines
3.4 KiB
Python

# Fakultät für Mathematik (FfM)
import getpass
import logging
import pathlib
import re
from urllib.parse import urljoin
import bs4
import requests
from .organizer import Organizer
from .utils import stream_to_path, PrettyLogger
__all__ = ["Ti"]
logger = logging.getLogger(__name__)
pretty = PrettyLogger(logger)
class Ti:
BASE_URL = "http://ti.ira.uka.de/"
FILE_RE = re.compile(r"^.+\.pdf$")
def __init__(self, base_path):
self.base_path = base_path
self._session = requests.Session()
self._credentials = None
def synchronize(self, urlpart, to_dir, transform=lambda x: x,
filter=lambda x: True):
pretty.starting_synchronizer(to_dir, "Ti", urlpart)
sync_path = pathlib.Path(self.base_path, to_dir)
orga = Organizer(self.base_path, sync_path)
orga.clean_temp_dir()
self._reset_credentials()
available = self._find_available(urlpart)
for name, address in sorted(available.items()):
path = pathlib.PurePath(name)
if filter(path):
self._crawl(urlpart + address, path, orga, transform)
else:
logger.info(f"Skipping {name}/")
orga.clean_sync_dir()
orga.clean_temp_dir()
self._reset_credentials()
def _find_available(self, urlpart):
url = self.BASE_URL + urlpart
r = self._session.get(url)
soup = bs4.BeautifulSoup(r.text, "html.parser")
available = {}
if soup.find(href="./Vorlesung/Vorlesung.php"):
logger.info("Found Folien/")
available["Folien"] = "/Vorlesung/"
if soup.find(href="./Uebungen/Uebungen.php"):
logger.info("Found Blätter/")
available["Blätter"] = "/Uebungen/"
if soup.find(href="./Tutorien/Tutorien.php"):
logger.info("Found Tutorien/")
available["Tutorien"] = "/Tutorien/"
return available
def _crawl(self, urlpart, path, orga, transform):
url = self.BASE_URL + urlpart
r = self._session.get(url)
soup = bs4.BeautifulSoup(r.text, "html.parser")
for filelink in soup.find_all("a", href=self.FILE_RE):
filepath = path / filelink["href"]
fileurl = urljoin(url, filelink["href"])
new_path = transform(filepath)
if new_path is None:
continue
logger.debug(f"Transformed from {filepath} to {new_path}")
temp_path = orga.temp_file()
self._download(fileurl, temp_path)
orga.add_file(temp_path, new_path)
def _get_credentials(self):
if self._credentials is None:
print("Please enter Ti credentials.")
username = getpass.getpass(prompt="Username: ")
password = getpass.getpass(prompt="Password: ")
self._credentials = (username, password)
return self._credentials
def _reset_credentials(self):
self._credentials = None
def _download(self, url, to_path):
while True:
username, password = self._get_credentials()
with self._session.get(url, stream=True, auth=(username, password)) as r:
if r.ok:
stream_to_path(r, to_path)
return
else:
print("Incorrect credentials.")
self._reset_credentials()