mirror of
https://github.com/Garmelon/PFERD.git
synced 2025-10-31 12:52:43 +01:00
270 lines
8.9 KiB
Python
270 lines
8.9 KiB
Python
"""
|
|
Contains an ILIAS crawler alongside helper functions.
|
|
"""
|
|
|
|
import datetime
|
|
import json
|
|
import logging
|
|
import re
|
|
from pathlib import Path
|
|
from typing import Any, Dict, List, Optional
|
|
from urllib.parse import (parse_qs, urlencode, urljoin, urlparse, urlsplit,
|
|
urlunsplit)
|
|
|
|
import bs4
|
|
|
|
from ..cookie_jar import CookieJar
|
|
from ..utils import soupify
|
|
from .authenticators import IliasAuthenticator
|
|
from .downloader import IliasDownloadInfo
|
|
|
|
LOGGER = logging.getLogger(__name__)
|
|
|
|
|
|
class IliasCrawler:
|
|
# pylint: disable=too-few-public-methods
|
|
"""
|
|
A crawler for ILIAS.
|
|
"""
|
|
|
|
def __init__(self, authenticator: IliasAuthenticator, base_url: str, course_id: str):
|
|
"""
|
|
Create a new ILIAS crawler.
|
|
"""
|
|
self._cookie_jar = CookieJar(Path("/tmp/test/cookies"))
|
|
self._cookie_jar.load_cookies()
|
|
|
|
self._base_url = base_url
|
|
self._course_id = course_id
|
|
self._session = self._cookie_jar.create_session()
|
|
self._authenticator = authenticator
|
|
|
|
def _abs_url_from_link(self, link_tag: bs4.Tag) -> str:
|
|
"""
|
|
Create an absolute url from an <a> tag.
|
|
"""
|
|
return urljoin(self._base_url, link_tag.get("href"))
|
|
|
|
@staticmethod
|
|
def _url_set_query_param(url: str, param: str, value: str) -> str:
|
|
scheme, netloc, path, query, fragment = urlsplit(url)
|
|
query_parameters = parse_qs(query)
|
|
query_parameters[param] = [value]
|
|
new_query_string = urlencode(query_parameters, doseq=True)
|
|
|
|
return urlunsplit((scheme, netloc, path, new_query_string, fragment))
|
|
|
|
def crawl(self) -> List[IliasDownloadInfo]:
|
|
"""
|
|
Starts the crawl process, yielding a list of elements to (potentially) download.
|
|
"""
|
|
root_url = self._url_set_query_param(
|
|
self._base_url + "/goto.php", "target", f"crs_{self._course_id}"
|
|
)
|
|
|
|
return self._crawl_folder(Path(""), root_url)
|
|
|
|
def _switch_on_crawled_type(
|
|
self,
|
|
path: Path,
|
|
link_element: bs4.Tag,
|
|
url: str
|
|
) -> List[IliasDownloadInfo]:
|
|
"""
|
|
Decides which sub crawler to use for a given top level element.
|
|
"""
|
|
parsed_url = urlparse(url)
|
|
LOGGER.debug("Parsed url: %r", parsed_url)
|
|
|
|
if "target=file_" in parsed_url.query:
|
|
return self._crawl_file(path, link_element, url)
|
|
|
|
# Skip forums
|
|
if "cmd=showThreads" in parsed_url.query:
|
|
LOGGER.debug("Skipping forum %r", url)
|
|
return []
|
|
|
|
if "ref_id=" in parsed_url.query:
|
|
LOGGER.debug("Processing folder-like...")
|
|
return self._switch_on_folder_like(path, link_element, url)
|
|
|
|
LOGGER.warning("Got unknown type, %r, %r, %r", path, link_element, url)
|
|
# TODO: Other types
|
|
raise Exception("Implement me!")
|
|
|
|
@staticmethod
|
|
def _crawl_file(path: Path, link_element: bs4.Tag, url: str) -> List[IliasDownloadInfo]:
|
|
"""
|
|
Crawls a file.
|
|
"""
|
|
properties_parent: bs4.Tag = link_element.findParent(
|
|
"div", {"class": lambda x: "il_ContainerListItem" in x}
|
|
).select_one(".il_ItemProperties")
|
|
file_type = properties_parent.select_one("span.il_ItemProperty").getText().strip()
|
|
|
|
modifcation_date = datetime.datetime.now()
|
|
all_properties_text = properties_parent.getText().strip()
|
|
print("Property text is", all_properties_text)
|
|
# todo demangle date from text above
|
|
|
|
name = link_element.getText()
|
|
full_path = Path(path, name + "." + file_type)
|
|
|
|
match_result = re.match(r".+target=file_(\d+).+", url)
|
|
|
|
if match_result is None:
|
|
LOGGER.warning("Could not download file %r", url)
|
|
return []
|
|
|
|
return [IliasDownloadInfo(full_path, url, modifcation_date)]
|
|
|
|
def _switch_on_folder_like(
|
|
self,
|
|
path: Path,
|
|
link_element: bs4.Tag,
|
|
url: str
|
|
) -> List[IliasDownloadInfo]:
|
|
found_parent: Optional[bs4.Tag] = None
|
|
|
|
for parent in link_element.parents:
|
|
if "ilContainerListItemOuter" in parent["class"]:
|
|
found_parent = parent
|
|
break
|
|
|
|
if found_parent is None:
|
|
LOGGER.warning("Could not find element icon for %r", url)
|
|
return []
|
|
|
|
img_tag: Optional[bs4.Tag] = found_parent.select_one("img.ilListItemIcon")
|
|
|
|
if img_tag is None:
|
|
LOGGER.warning("Could not find image tag for %r", url)
|
|
return []
|
|
|
|
if str(img_tag["src"]).endswith("frm.svg"):
|
|
LOGGER.debug("Skipping forum at %r", url)
|
|
return []
|
|
|
|
if "opencast" in str(img_tag["alt"]).lower():
|
|
LOGGER.debug("Found video site: %r", url)
|
|
return self._crawl_video_directory(path, url)
|
|
|
|
# Assume it is a folder
|
|
folder_name = link_element.getText()
|
|
folder_path = Path(path, folder_name)
|
|
return self._crawl_folder(folder_path, self._abs_url_from_link(link_element))
|
|
|
|
def _crawl_video_directory(self, path: Path, url: str) -> List[IliasDownloadInfo]:
|
|
initial_soup = self._get_page(url, {})
|
|
content_link: bs4.Tag = initial_soup.select_one("#tab_series a")
|
|
video_list_soup = self._get_page(
|
|
self._abs_url_from_link(content_link),
|
|
{"limit": 800, "cmd": "asyncGetTableGUI", "cmdMode": "asynch"}
|
|
)
|
|
|
|
video_links: List[bs4.Tag] = video_list_soup.findAll(
|
|
name="a", text=re.compile(r"\s*Abspielen\s*")
|
|
)
|
|
|
|
results: List[IliasDownloadInfo] = []
|
|
|
|
for link in video_links:
|
|
results += self._crawl_single_video(path, link)
|
|
|
|
return results
|
|
|
|
def _crawl_single_video(self, path: Path, link: bs4.Tag) -> List[IliasDownloadInfo]:
|
|
video_page_url = self._abs_url_from_link(link)
|
|
|
|
modification_string = link.parent.parent.parent.select_one(
|
|
"td.std:nth-child(6)"
|
|
).getText().strip()
|
|
modification_time = datetime.datetime.strptime(modification_string, "%d.%m.%Y - %H:%M")
|
|
|
|
title = link.parent.parent.parent.select_one(
|
|
"td.std:nth-child(3)"
|
|
).getText().strip()
|
|
|
|
video_page_soup = self._get_page(video_page_url, {})
|
|
regex: re.Pattern = re.compile(
|
|
r"({\"streams\"[\s\S]+?),\s*{\"paella_config_file", re.IGNORECASE
|
|
)
|
|
json_match = regex.search(str(video_page_soup))
|
|
|
|
if json_match is None:
|
|
LOGGER.warning("Could not find json stream info for %r", video_page_url)
|
|
return []
|
|
json_str = json_match.group(1)
|
|
|
|
json_object = json.loads(json_str)
|
|
video_url = json_object["streams"][0]["sources"]["mp4"][0]["src"]
|
|
|
|
return [IliasDownloadInfo(Path(path, title), video_url, modification_time)]
|
|
|
|
def _crawl_folder(self, path: Path, url: str) -> List[IliasDownloadInfo]:
|
|
soup = self._get_page(url, {})
|
|
|
|
result: List[IliasDownloadInfo] = []
|
|
|
|
links: List[bs4.Tag] = soup.select("a.il_ContainerItemTitle")
|
|
for link in links:
|
|
abs_url = self._abs_url_from_link(link)
|
|
result += self._switch_on_crawled_type(path, link, abs_url)
|
|
|
|
return result
|
|
|
|
def _get_page(self, url: str, params: Dict[str, Any]) -> bs4.BeautifulSoup:
|
|
"""
|
|
Fetches a page from ILIAS, authenticating when needed.
|
|
"""
|
|
LOGGER.debug("Fetching %r", url)
|
|
|
|
response = self._session.get(url, params=params)
|
|
content_type = response.headers["content-type"]
|
|
|
|
if not content_type.startswith("text/html"):
|
|
# TODO: Correct exception type
|
|
raise Exception(f"Invalid content type {content_type}")
|
|
|
|
soup = soupify(response)
|
|
|
|
if self._is_logged_in(soup):
|
|
return soup
|
|
|
|
LOGGER.info("Not authenticated, changing that...")
|
|
|
|
self._authenticator.authenticate(self._session)
|
|
|
|
self._cookie_jar.save_cookies("Authed")
|
|
|
|
return self._get_page(url, params)
|
|
|
|
@staticmethod
|
|
def _is_logged_in(soup: bs4.BeautifulSoup) -> bool:
|
|
userlog = soup.find("li", {"id": "userlog"})
|
|
if userlog is not None:
|
|
print("Found userlog")
|
|
return True
|
|
video_table = soup.find(
|
|
recursive=True,
|
|
name="table",
|
|
attrs={"id": lambda x: x is not None and x.startswith("tbl_xoct")}
|
|
)
|
|
if video_table is not None:
|
|
print("Found video")
|
|
return True
|
|
if soup.select_one("#playerContainer") is not None:
|
|
print("Found player")
|
|
return True
|
|
print("Ooops: ", soup)
|
|
return False
|
|
|
|
|
|
def run_as_test(ilias_url: str, course_id: int) -> List[IliasDownloadInfo]:
|
|
from ..organizer import Organizer
|
|
from .authenticators import KitShibbolethAuthenticator
|
|
organizer = Organizer(Path("/tmp/test/inner"))
|
|
|
|
crawler = IliasCrawler(KitShibbolethAuthenticator(), ilias_url, str(course_id))
|
|
return crawler.crawl()
|