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