Use shared ILIASCrawler

PFERD/cookie_jar.py

@@ -40,7 +40,7 @@ class CookieJar:
         except (FileNotFoundError, LoadError):
             LOGGER.warning(
                 "No valid cookie file found at %s, continuing with no cookies",
-                self._cookies.filename
+                self._cookies.filename,
             )
 
     def save_cookies(self, reason: Optional[str] = None) -> None:
@@ -69,6 +69,5 @@ class CookieJar:
     def create_async_client(self) -> httpx.AsyncClient:
         """Create a new async client using the cookie jar."""
         # TODO: timeout=None was the default behaviour of requests. An approprite value should probably be set
-        client = httpx.AsyncClient(timeout=None)
-        client.cookies = self.cookies
+        client = httpx.AsyncClient(timeout=None, cookies=self.cookies)
         return client

PFERD/diva.py

@@ -25,6 +25,7 @@ class DivaDownloadInfo(Transformable):
     """
     Information about a DIVA video
     """
+
     url: str
 
 
@@ -49,7 +50,9 @@ class DivaPlaylistCrawler:
     """
 
     _PLAYLIST_BASE_URL = "https://mediaservice.bibliothek.kit.edu/asset/detail/"
-    _COLLECTION_BASE_URL = "https://mediaservice.bibliothek.kit.edu/asset/collection.json"
+    _COLLECTION_BASE_URL = (
+        "https://mediaservice.bibliothek.kit.edu/asset/collection.json"
+    )
 
     def __init__(self, playlist_id: str):
         self._id = playlist_id
@@ -108,15 +111,16 @@ class DivaPlaylistCrawler:
             title = video["title"]
             collection_title = self._follow_path(["collection", "title"], video)
             url = self._follow_path(
-                ["resourceList", "derivateList", "mp4", "url"],
-                video
+                ["resourceList", "derivateList", "mp4", "url"], video
             )
 
             if url and collection_title and title:
                 path = Path(collection_title, title + ".mp4")
                 download_infos.append(DivaDownloadInfo(path, url))
             else:
-                PRETTY.warning(f"Incomplete video found: {title!r} {collection_title!r} {url!r}")
+                PRETTY.warning(
+                    f"Incomplete video found: {title!r} {collection_title!r} {url!r}"
+                )
 
         return download_infos
 
@@ -139,7 +143,9 @@ class DivaDownloader:
     A downloader for DIVA videos.
     """
 
-    def __init__(self, tmp_dir: TmpDir, organizer: Organizer, strategy: DivaDownloadStrategy):
+    def __init__(
+        self, tmp_dir: TmpDir, organizer: Organizer, strategy: DivaDownloadStrategy
+    ):
         self._tmp_dir = tmp_dir
         self._organizer = organizer
         self._strategy = strategy
@@ -166,4 +172,6 @@ class DivaDownloader:
                 stream_to_path(response, tmp_file, info.path.name)
                 self._organizer.accept_file(tmp_file, info.path)
             else:
-                PRETTY.warning(f"Could not download file, got response {response.status_code}")
+                PRETTY.warning(
+                    f"Could not download file, got response {response.status_code}"
+                )

PFERD/download_summary.py

@@ -42,13 +42,17 @@ class DownloadSummary:
         """
         return self._deleted_files.copy()
 
-    def merge(self, summary: 'DownloadSummary') -> None:
+    def merge(self, summary: "DownloadSummary") -> None:
         """
         Merges ourselves with the passed summary. Modifies this object, but not the passed one.
         """
         self._new_files = _mergeNoDuplicate(self._new_files, summary.new_files)
-        self._modified_files = _mergeNoDuplicate(self._modified_files, summary.modified_files)
-        self._deleted_files = _mergeNoDuplicate(self._deleted_files, summary.deleted_files)
+        self._modified_files = _mergeNoDuplicate(
+            self._modified_files, summary.modified_files
+        )
+        self._deleted_files = _mergeNoDuplicate(
+            self._deleted_files, summary.deleted_files
+        )
 
     def add_deleted_file(self, path: Path) -> None:
         """

PFERD/downloaders.py

@@ -65,4 +65,6 @@ class HttpDownloader:
                 self._organizer.accept_file(tmp_file, info.path)
             else:
                 # TODO use proper exception
-                raise Exception(f"Could not download file, got response {response.status_code}")
+                raise Exception(
+                    f"Could not download file, got response {response.status_code}"
+                )

PFERD/errors.py

@@ -19,13 +19,14 @@ class FatalException(Exception):
     """
 
 
-TFun = TypeVar('TFun', bound=Callable[..., Any])
+TFun = TypeVar("TFun", bound=Callable[..., Any])
 
 
 def swallow_and_print_errors(function: TFun) -> TFun:
     """
     Decorates a function, swallows all errors, logs them and returns none if one occurred.
     """
+
     def inner(*args: Any, **kwargs: Any) -> Any:
         # pylint: disable=broad-except
         try:
@@ -36,6 +37,7 @@ def swallow_and_print_errors(function: TFun) -> TFun:
         except Exception as error:
             Console().print_exception()
             return None
+
     return cast(TFun, inner)
 
 
@@ -43,6 +45,7 @@ def retry_on_io_exception(max_retries: int, message: str) -> Callable[[TFun], TF
     """
     Decorates a function and retries it on any exception until the max retries count is hit.
     """
+
     def retry(function: TFun) -> TFun:
         def inner(*args: Any, **kwargs: Any) -> Any:
             for i in range(0, max_retries):
@@ -52,6 +55,9 @@ def retry_on_io_exception(max_retries: int, message: str) -> Callable[[TFun], TF
                 except IOError as error:
                     PRETTY.warning(f"Error duing operation '{message}': {error}")
                     PRETTY.warning(
-                        f"Retrying operation '{message}'. Remaining retries: {max_retries - 1 - i}")
+                        f"Retrying operation '{message}'. Remaining retries: {max_retries - 1 - i}"
+                    )
+
         return cast(TFun, inner)
+
     return retry

PFERD/ilias/__init__.py

@@ -3,8 +3,18 @@ Synchronizing files from ILIAS instances (https://www.ilias.de/).
 """
 
 from .authenticators import IliasAuthenticator, KitShibbolethAuthenticator
-from .crawler import (IliasCrawler, IliasCrawlerEntry, IliasDirectoryFilter,
-                      IliasElementType)
-from .downloader import (IliasDownloader, IliasDownloadInfo,
-                         IliasDownloadStrategy, download_everything,
-                         download_modified_or_new)
+from .crawler import (
+    IliasCrawler,
+    IliasCrawlerEntry,
+    IliasDirectoryFilter,
+    IliasElementType,
+)
+from .downloader import (
+    IliasDownloader,
+    IliasDownloadInfo,
+    IliasDownloadStrategy,
+    download_everything,
+    download_modified_or_new,
+)
+
+from .syncronizer import IliasSycronizer, ResultContainer

PFERD/ilias/authenticators.py

@@ -84,7 +84,7 @@ class KitShibbolethAuthenticator(IliasAuthenticator):
                 "_eventId_proceed": "",
                 "j_username": self._auth.username,
                 "j_password": self._auth.password,
-                "csrf_token": csrf_token
+                "csrf_token": csrf_token,
             }
             soup = soupify(await client.post(url, data=data))
 
@@ -108,9 +108,7 @@ class KitShibbolethAuthenticator(IliasAuthenticator):
         await client.post(url, data=data)
 
     async def _authenticate_tfa(
-            self,
-            client: httpx.AsyncClient,
-            soup: bs4.BeautifulSoup
+        self, client: httpx.AsyncClient, soup: bs4.BeautifulSoup
     ) -> bs4.BeautifulSoup:
         # Searching the form here so that this fails before asking for
         # credentials rather than after asking.
@@ -121,10 +119,7 @@ class KitShibbolethAuthenticator(IliasAuthenticator):
         # https://idp.scc.kit.edu/idp/profile/SAML2/Redirect/SSO
         LOGGER.debug("Attempt to log in to Shibboleth with TFA token")
         url = "https://idp.scc.kit.edu" + action
-        data = {
-            "_eventId_proceed": "",
-            "j_tokenNumber": self._tfa_auth.get_token()
-        }
+        data = {"_eventId_proceed": "", "j_tokenNumber": self._tfa_auth.get_token()}
         return soupify(await client.post(url, data=data))
 
     @staticmethod

PFERD/ilias/crawler.py

@@ -2,20 +2,18 @@
 Contains an ILIAS crawler alongside helper functions.
 """
 
-from asyncio.queues import Queue
 import datetime
 import json
 import logging
 import re
 from enum import Enum
 from pathlib import Path
-from typing import Any, Callable, Awaitable, Dict, List, Optional, Union
-from urllib.parse import (parse_qs, urlencode, urljoin, urlparse, urlsplit,
-                          urlunsplit)
+from typing import Any, Callable, Awaitable, Dict, List, Optional, Union, Tuple
+from urllib.parse import parse_qs, urlencode, urljoin, urlparse, urlsplit, urlunsplit
 
+import asyncio
 import bs4
 import httpx
-import asyncio
 
 from ..errors import FatalException, retry_on_io_exception
 from ..logging import PrettyLogger
@@ -32,10 +30,23 @@ def _sanitize_path_name(name: str) -> str:
     return name.replace("/", "-").replace("\\", "-")
 
 
+class ResultContainer:
+    def __init__(self):
+        self._results = []
+
+    def add_result(self, result: IliasDownloadInfo):
+        self._results.append(result)
+
+    def get_results(self) -> List[IliasDownloadInfo]:
+        return self._results
+
+
 class IliasElementType(Enum):
     """
     The type of an ilias element.
     """
+
+    COURSE = "COURSE"
     REGULAR_FOLDER = "REGULAR_FOLDER"
     VIDEO_FOLDER = "VIDEO_FOLDER"
     EXERCISE_FOLDER = "EXERCISE_FOLDER"
@@ -55,6 +66,17 @@ class IliasElementType(Enum):
 IliasDirectoryFilter = Callable[[Path, IliasElementType], bool]
 
 
+class InvalidCourseError(FatalException):
+    """
+    A invalid Course ID was encountered
+    """
+
+    def __init__(course_id: str):
+        super(
+            f"Invalid course id {course_id}? I didn't find anything looking like a course!"
+        )
+
+
 class IliasCrawlerEntry:
     # pylint: disable=too-few-public-methods
     """
@@ -66,11 +88,10 @@ class IliasCrawlerEntry:
         path: Path,
         url: Union[str, Callable[[], Awaitable[Optional[str]]]],
         entry_type: IliasElementType,
-            modification_date: Optional[datetime.datetime]
+        modification_date: Optional[datetime.datetime],
     ):
         self.path = path
         if isinstance(url, str):
-            # TODO: Dirty hack, remove
             future = asyncio.Future()
             future.set_result(url)
             self.url: Callable[[], Awaitable[Optional[str]]] = lambda: future
@@ -84,7 +105,10 @@ class IliasCrawlerEntry:
         Converts this crawler entry to an IliasDownloadInfo, if possible.
         This method will only succeed for *File* types.
         """
-        if self.entry_type in [IliasElementType.REGULAR_FILE, IliasElementType.VIDEO_FILE]:
+        if self.entry_type in [
+            IliasElementType.REGULAR_FILE,
+            IliasElementType.VIDEO_FILE,
+        ]:
             return IliasDownloadInfo(self.path, self.url, self.modification_date)
         return None
 
@@ -102,12 +126,11 @@ class IliasCrawler:
         base_url: str,
         client: httpx.AsyncClient,
         authenticator: IliasAuthenticator,
-            dir_filter: IliasDirectoryFilter
+        dir_filter: IliasDirectoryFilter,
     ):
         """
         Create a new ILIAS crawler.
         """
-
         self._base_url = base_url
         self._client = client
         self._authenticator = authenticator
@@ -125,52 +148,31 @@ class IliasCrawler:
 
         return urlunsplit((scheme, netloc, path, new_query_string, fragment))
 
-    async def recursive_crawl_url(self, url: str) -> List[IliasDownloadInfo]:
+    async def recursive_crawl_url(self, url: str) -> IliasCrawlerEntry:
         """
-        Crawls a given url *and all reachable elements in it*.
+        Creates a crawl target for a given url *and all reachable elements in it*.
 
         Args:
             url {str} -- the *full* url to crawl
         """
-        start_entries: List[IliasCrawlerEntry] = await self._crawl_folder(Path(""), url)
-        return await self._iterate_entries_to_download_infos(start_entries)
 
-    async def crawl_course(self, course_id: str) -> List[IliasDownloadInfo]:
+        return IliasCrawlerEntry(Path(""), url, IliasElementType.REGULAR_FOLDER, None)
+
+    async def crawl_course(self, course_id: str) -> IliasCrawlerEntry:
         """
-        Starts the crawl process for a course, yielding a list of elements to (potentially)
+        Creates a crawl target for a course, yielding a list of elements to (potentially)
         download.
 
         Arguments:
             course_id {str} -- the course id
 
-        Raises:
-            FatalException: if an unrecoverable error occurs or the course id is not valid
         """
         # Start crawling at the given course
         root_url = self._url_set_query_param(
             self._base_url + "/goto.php", "target", f"crs_{course_id}"
         )
 
-        if not await self._is_course_id_valid(root_url, course_id):
-            raise FatalException(
-                "Invalid course id? I didn't find anything looking like a course!"
-            )
-
-        # And treat it as a folder
-        entries: List[IliasCrawlerEntry] = await self._crawl_folder(Path(""), root_url)
-        return await self._iterate_entries_to_download_infos(entries)
-
-    async def _is_course_id_valid(self, root_url: str, course_id: str) -> bool:
-        response: httpx.Response = await self._client.get(root_url)
-        # We were redirected ==> Non-existant ID
-        if course_id not in str(response.url):
-            return False
-
-        link_element: bs4.Tag = (await self._get_page(root_url, {})).find(id="current_perma_link")
-        if not link_element:
-            return False
-        # It wasn't a course but a category list, forum, etc.
-        return "crs_" in link_element.get("value")
+        return IliasCrawlerEntry(Path(""), root_url, IliasElementType.COURSE, None)
 
     async def find_course_name(self, course_id: str) -> Optional[str]:
         """
@@ -186,26 +188,28 @@ class IliasCrawler:
         """
         Returns the name of the element at the given URL, if it can find one.
         """
-        focus_element: bs4.Tag = await self._get_page(url, {}).find(id="il_mhead_t_focus")
+        focus_element: bs4.Tag = await self._get_page(url, {}).find(
+            id="il_mhead_t_focus"
+        )
         if not focus_element:
             return None
         return focus_element.text
 
-    async def crawl_personal_desktop(self) -> List[IliasDownloadInfo]:
+    async def crawl_personal_desktop(self) -> IliasCrawlerEntry:
         """
-        Crawls the ILIAS personal desktop (and every subelements that can be reached from there).
-
-        Raises:
-            FatalException: if an unrecoverable error occurs
+        Creates a crawl target for the ILIAS personal desktop (and every subelements that can be reached from there).
+        download.
         """
-        entries: List[IliasCrawlerEntry] = await self._crawl_folder(
-            Path(""), self._base_url + "?baseClass=ilPersonalDesktopGUI"
+        return IliasCrawlerEntry(
+            Path(""),
+            self._base_url + "?baseClass=ilPersonalDesktopGUI",
+            IliasElementType.REGULAR_FOLDER,
+            None,
         )
-        return await self._iterate_entries_to_download_infos(entries)
 
-    async def _crawl_worker(self, entries_to_process: asyncio.Queue, result: List[IliasDownloadInfo]):
+    async def _crawl_worker(self, entries_to_process: asyncio.Queue):
         while True:
-            entry = await entries_to_process.get()
+            (entry, results) = await entries_to_process.get()
 
             if entry.entry_type == IliasElementType.EXTERNAL_LINK:
                 PRETTY.not_searching(entry.path, "external link")
@@ -216,21 +220,25 @@ class IliasCrawler:
                 entries_to_process.task_done()
                 continue
 
-            if entry.entry_type.is_folder() and not self.dir_filter(entry.path, entry.entry_type):
+            if entry.entry_type.is_folder() and not self.dir_filter(
+                entry.path, entry.entry_type
+            ):
                 PRETTY.not_searching(entry.path, "user filter")
                 entries_to_process.task_done()
                 continue
 
             download_info = entry.to_download_info()
             if download_info is not None:
-                result.append(download_info)
+                results.add_result(download_info)
                 entries_to_process.task_done()
                 continue
 
             url = await entry.url()
 
             if url is None:
-                PRETTY.warning(f"Could not find url for {str(entry.path)!r}, skipping it")
+                PRETTY.warning(
+                    f"Could not find url for {str(entry.path)!r}, skipping it"
+                )
                 entries_to_process.task_done()
                 continue
 
@@ -238,37 +246,46 @@ class IliasCrawler:
 
             if entry.entry_type == IliasElementType.EXERCISE_FOLDER:
                 for task in await self._crawl_exercises(entry.path, url):
-                    entries_to_process.put_nowait(task)
+                    entries_to_process.put_nowait((task, results))
                 entries_to_process.task_done()
                 continue
             if entry.entry_type == IliasElementType.REGULAR_FOLDER:
                 for task in await self._crawl_folder(entry.path, url):
-                    entries_to_process.put_nowait(task)
+                    entries_to_process.put_nowait((task, results))
+                entries_to_process.task_done()
+                continue
+            if entry.entry_type == IliasElementType.COURSE:
+                for task in await self._crawl_folder(
+                    entry.path, url, url.split("crs_")[1]
+                ):
+                    entries_to_process.put_nowait((task, results))
                 entries_to_process.task_done()
                 continue
             if entry.entry_type == IliasElementType.VIDEO_FOLDER:
                 for task in await self._crawl_video_directory(entry.path, url):
-                    entries_to_process.put_nowait(task)
+                    entries_to_process.put_nowait((task, results))
                 entries_to_process.task_done()
                 continue
 
             PRETTY.warning(f"Unknown type: {entry.entry_type}!")
 
-
-    async def _iterate_entries_to_download_infos(
-            self,
-            entries: List[IliasCrawlerEntry]
-    ) -> List[IliasDownloadInfo]:
-        result: List[IliasDownloadInfo] = []
+    async def iterate_entries_to_download_infos(
+        self, entries: List[Tuple[IliasCrawlerEntry, ResultContainer]]
+    ):
         crawl_queue = asyncio.Queue()
+
+        # Setup authentication locks
+        self._auth_event = asyncio.Event()
+        self._auth_lock = asyncio.Lock()
+
         for entry in entries:
             crawl_queue.put_nowait(entry)
 
         workers = []
 
         # TODO: Find proper worker limit
-        for _ in range(10):
-            worker = asyncio.create_task(self._crawl_worker(crawl_queue, result))
+        for _ in range(20):
+            worker = asyncio.create_task(self._crawl_worker(crawl_queue))
             workers.append(worker)
 
         await crawl_queue.join()
@@ -278,13 +295,22 @@ class IliasCrawler:
 
         # Wait until all worker tasks are cancelled.
         await asyncio.gather(*workers, return_exceptions=True)
-        return result
 
-    async def _crawl_folder(self, folder_path: Path, url: str) -> List[IliasCrawlerEntry]:
+    async def _crawl_folder(
+        self, folder_path: Path, url: str, course: Optional[str] = None
+    ) -> List[IliasCrawlerEntry]:
         """
         Crawl all files in a folder-like element.
+
+        Raises a InvalidCourseError if the folder is a non existent course.
         """
-        soup = await self._get_page(url, {})
+        soup = await self._get_page(url, {}, check_course_id_valid=course)
+
+        if course is not None:
+            link_element: bs4.Tag = soup.find(id="current_perma_link")
+            # It wasn't a course but a category list, forum, etc.
+            if not link_element or "crs_" not in link_element.get("value"):
+                raise InvalidCourseError(course)
 
         if soup.find(id="headerimage"):
             element: bs4.Tag = soup.find(id="headerimage")
@@ -301,7 +327,9 @@ class IliasCrawler:
         links: List[bs4.Tag] = soup.select("a.il_ContainerItemTitle")
         for link in links:
             abs_url = self._abs_url_from_link(link)
-            element_path = Path(folder_path, _sanitize_path_name(link.getText().strip()))
+            element_path = Path(
+                folder_path, _sanitize_path_name(link.getText().strip())
+            )
             element_type = self._find_type_from_link(element_path, link, abs_url)
 
             if element_type == IliasElementType.REGULAR_FILE:
@@ -312,18 +340,24 @@ class IliasCrawler:
                 date_portion = demangle_date(date_portion_str)
 
                 if not date_portion:
-                    result += [IliasCrawlerEntry(element_path, abs_url, element_type, None)]
+                    result += [
+                        IliasCrawlerEntry(element_path, abs_url, element_type, None)
+                    ]
                     continue
 
                 rest_of_name = meeting_name
                 if rest_of_name.startswith(date_portion_str):
-                    rest_of_name = rest_of_name[len(date_portion_str):]
+                    rest_of_name = rest_of_name[len(date_portion_str) :]
 
-                new_name = datetime.datetime.strftime(date_portion, "%Y-%m-%d, %H:%M") \
+                new_name = (
+                    datetime.datetime.strftime(date_portion, "%Y-%m-%d, %H:%M")
                     + rest_of_name
+                )
                 new_path = Path(folder_path, _sanitize_path_name(new_name))
                 result += [
-                    IliasCrawlerEntry(new_path, abs_url, IliasElementType.REGULAR_FOLDER, None)
+                    IliasCrawlerEntry(
+                        new_path, abs_url, IliasElementType.REGULAR_FOLDER, None
+                    )
                 ]
             elif element_type is not None:
                 result += [IliasCrawlerEntry(element_path, abs_url, element_type, None)]
@@ -340,9 +374,7 @@ class IliasCrawler:
 
     @staticmethod
     def _find_type_from_link(
-            path: Path,
-            link_element: bs4.Tag,
-            url: str
+        path: Path, link_element: bs4.Tag, url: str
     ) -> Optional[IliasElementType]:
         """
         Decides which sub crawler to use for a given top level element.
@@ -370,7 +402,9 @@ class IliasCrawler:
         return None
 
     @staticmethod
-    def _find_type_from_folder_like(link_element: bs4.Tag, url: str) -> Optional[IliasElementType]:
+    def _find_type_from_folder_like(
+        link_element: bs4.Tag, url: str
+    ) -> Optional[IliasElementType]:
         """
         Try crawling something that looks like a folder.
         """
@@ -414,7 +448,9 @@ class IliasCrawler:
         return IliasElementType.REGULAR_FOLDER
 
     @staticmethod
-    def _crawl_file(path: Path, link_element: bs4.Tag, url: str) -> List[IliasCrawlerEntry]:
+    def _crawl_file(
+        path: Path, link_element: bs4.Tag, url: str
+    ) -> List[IliasCrawlerEntry]:
         """
         Crawls a file.
         """
@@ -425,14 +461,16 @@ class IliasCrawler:
             "div", {"class": lambda x: "il_ContainerListItem" in x}
         ).select_one(".il_ItemProperties")
         # The first one is always the filetype
-        file_type = properties_parent.select_one("span.il_ItemProperty").getText().strip()
+        file_type = (
+            properties_parent.select_one("span.il_ItemProperty").getText().strip()
+        )
 
         # The rest does not have a stable order. Grab the whole text and reg-ex the date
         # out of it
         all_properties_text = properties_parent.getText().strip()
         modification_date_match = re.search(
             r"(((\d+\. \w+ \d+)|(Gestern|Yesterday)|(Heute|Today)|(Morgen|Tomorrow)), \d+:\d+)",
-            all_properties_text
+            all_properties_text,
         )
         if modification_date_match is None:
             modification_date = None
@@ -446,10 +484,14 @@ class IliasCrawler:
         full_path = Path(path, name + "." + file_type)
 
         return [
-            IliasCrawlerEntry(full_path, url, IliasElementType.REGULAR_FILE, modification_date)
+            IliasCrawlerEntry(
+                full_path, url, IliasElementType.REGULAR_FILE, modification_date
+            )
         ]
 
-    async def _crawl_video_directory(self, video_dir_path: Path, url: str) -> List[IliasCrawlerEntry]:
+    async def _crawl_video_directory(
+        self, video_dir_path: Path, url: str
+    ) -> List[IliasCrawlerEntry]:
         """
         Crawl the video overview site.
         """
@@ -462,7 +504,7 @@ class IliasCrawler:
         # in a standalone html page
         video_list_soup = await self._get_page(
             self._abs_url_from_link(content_link),
-            {"limit": 800, "cmd": "asyncGetTableGUI", "cmdMode": "asynch"}
+            {"limit": 800, "cmd": "asyncGetTableGUI", "cmdMode": "asynch"},
         )
 
         # If we find a page selected, we probably need to respect pagination
@@ -483,7 +525,7 @@ class IliasCrawler:
         self,
         video_dir_path: Path,
         paged_video_list_soup: bs4.BeautifulSoup,
-            second_stage_url: str
+        second_stage_url: str,
     ) -> List[IliasCrawlerEntry]:
         LOGGER.info("Found paginated video page, trying 800 elements")
 
@@ -498,7 +540,9 @@ class IliasCrawler:
                 "Could not increase elements per page (table not found)."
                 " Some might not be crawled!"
             )
-            return self._crawl_video_directory_second_stage(video_dir_path, paged_video_list_soup)
+            return self._crawl_video_directory_second_stage(
+                video_dir_path, paged_video_list_soup
+            )
 
         match = re.match(r"tbl_xoct_(.+)", table_element.attrs["id"])
         if match is None:
@@ -506,12 +550,18 @@ class IliasCrawler:
                 "Could not increase elements per page (table id not found)."
                 " Some might not be crawled!"
             )
-            return self._crawl_video_directory_second_stage(video_dir_path, paged_video_list_soup)
+            return self._crawl_video_directory_second_stage(
+                video_dir_path, paged_video_list_soup
+            )
         table_id = match.group(1)
 
         extended_video_page = await self._get_page(
             second_stage_url,
-            {f"tbl_xoct_{table_id}_trows": 800, "cmd": "asyncGetTableGUI", "cmdMode": "asynch"}
+            {
+                f"tbl_xoct_{table_id}_trows": 800,
+                "cmd": "asyncGetTableGUI",
+                "cmdMode": "asynch",
+            },
         )
 
         if self._is_paginated_video_page(extended_video_page):
@@ -520,12 +570,12 @@ class IliasCrawler:
                 " I will miss elements."
             )
 
-        return self._crawl_video_directory_second_stage(video_dir_path, extended_video_page)
+        return self._crawl_video_directory_second_stage(
+            video_dir_path, extended_video_page
+        )
 
     def _crawl_video_directory_second_stage(
-            self,
-            video_dir_path: Path,
-            video_list_soup: bs4.BeautifulSoup
+        self, video_dir_path: Path, video_list_soup: bs4.BeautifulSoup
     ) -> List[IliasCrawlerEntry]:
         """
         Crawls the "second stage" video page. This page contains the actual video urls.
@@ -553,24 +603,27 @@ class IliasCrawler:
         return results
 
     def _crawl_single_video(
-            self,
-            parent_path: Path,
-            link: bs4.Tag,
-            direct_download: bool
+        self, parent_path: Path, link: bs4.Tag, direct_download: bool
     ) -> List[IliasCrawlerEntry]:
         """
         Crawl a single video based on its "Abspielen" link from the video listing.
         """
         # The link is part of a table with multiple columns, describing metadata.
         # 6th child (1 indexed) is the modification time string
-        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")
+        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()
+        title = (
+            link.parent.parent.parent.select_one("td.std:nth-child(3)")
+            .getText()
+            .strip()
+        )
         title += ".mp4"
 
         video_path: Path = Path(parent_path, _sanitize_path_name(title))
@@ -580,18 +633,27 @@ class IliasCrawler:
         # The video had a direct download button we can use instead
         if direct_download:
             LOGGER.debug("Using direct download for video %r", str(video_path))
-            return [IliasCrawlerEntry(
-                video_path, video_url, IliasElementType.VIDEO_FILE, modification_time
-            )]
+            return [
+                IliasCrawlerEntry(
+                    video_path,
+                    video_url,
+                    IliasElementType.VIDEO_FILE,
+                    modification_time,
+                )
+            ]
 
-        return [IliasCrawlerEntry(
+        return [
+            IliasCrawlerEntry(
                 video_path,
                 self._crawl_video_url_from_play_link(video_url),
                 IliasElementType.VIDEO_FILE,
-            modification_time
-        )]
+                modification_time,
+            )
+        ]
 
-    def _crawl_video_url_from_play_link(self, play_url: str) -> Callable[[], Awaitable[Optional[str]]]:
+    def _crawl_video_url_from_play_link(
+        self, play_url: str
+    ) -> Callable[[], Awaitable[Optional[str]]]:
         async def inner() -> Optional[str]:
             # Fetch the actual video page. This is a small wrapper page initializing a javscript
             # player. Sadly we can not execute that JS. The actual video stream url is nowhere
@@ -614,9 +676,12 @@ class IliasCrawler:
             # and fetch the video url!
             video_url = json_object["streams"][0]["sources"]["mp4"][0]["src"]
             return video_url
+
         return inner
 
-    async def _crawl_exercises(self, element_path: Path, url: str) -> List[IliasCrawlerEntry]:
+    async def _crawl_exercises(
+        self, element_path: Path, url: str
+    ) -> List[IliasCrawlerEntry]:
         """
         Crawl files offered for download in exercises.
         """
@@ -625,17 +690,21 @@ class IliasCrawler:
         results: List[IliasCrawlerEntry] = []
 
         # Each assignment is in an accordion container
-        assignment_containers: List[bs4.Tag] = soup.select(".il_VAccordionInnerContainer")
+        assignment_containers: List[bs4.Tag] = soup.select(
+            ".il_VAccordionInnerContainer"
+        )
 
         for container in assignment_containers:
             # Fetch the container name out of the header to use it in the path
-            container_name = container.select_one(".ilAssignmentHeader").getText().strip()
+            container_name = (
+                container.select_one(".ilAssignmentHeader").getText().strip()
+            )
             # Find all download links in the container (this will contain all the files)
             files: List[bs4.Tag] = container.findAll(
                 name="a",
                 # download links contain the given command class
                 attrs={"href": lambda x: x and "cmdClass=ilexsubmissiongui" in x},
-                text="Download"
+                text="Download",
             )
 
             LOGGER.debug("Found exercise container %r", container_name)
@@ -650,30 +719,47 @@ class IliasCrawler:
 
                 LOGGER.debug("Found file %r at %r", file_name, url)
 
-                results.append(IliasCrawlerEntry(
+                results.append(
+                    IliasCrawlerEntry(
                         Path(element_path, container_name, file_name),
                         url,
                         IliasElementType.REGULAR_FILE,
-                    None  # We do not have any timestamp
-                ))
+                        None,  # We do not have any timestamp
+                    )
+                )
 
         return results
 
     @retry_on_io_exception(3, "fetching webpage")
-    async def _get_page(self, url: str, params: Dict[str, Any],
-                  retry_count: int = 0) -> bs4.BeautifulSoup:
+    async def _get_page(
+        self,
+        url: str,
+        params: Dict[str, Any],
+        retry_count: int = 0,
+        check_course_id_valid: Optional[str] = None,
+    ) -> bs4.BeautifulSoup:
         """
         Fetches a page from ILIAS, authenticating when needed.
+
+        Raises a InvalidCourseError if the page is a non existent course.
         """
 
         if retry_count >= 4:
-            raise FatalException("Could not get a proper page after 4 tries. "
+            raise FatalException(
+                "Could not get a proper page after 4 tries. "
                 "Maybe your URL is wrong, authentication fails continuously, "
-                                 "your ILIAS connection is spotty or ILIAS is not well.")
+                "your ILIAS connection is spotty or ILIAS is not well."
+            )
 
         LOGGER.debug("Fetching %r", url)
 
         response = await self._client.get(url, params=params)
+
+        if check_course_id_valid is not None:
+            # We were redirected ==> Non-existant ID
+            if check_course_id_valid not in str(response.url):
+                raise InvalidCourseError(check_course_id_valid)
+
         content_type = response.headers["content-type"]
 
         if not content_type.startswith("text/html"):
@@ -687,11 +773,23 @@ class IliasCrawler:
         if self._is_logged_in(soup):
             return soup
 
+        if self._auth_lock.locked():
+            # Some other future is already logging in
+            await self._auth_event.wait()
+        else:
+            await self._auth_lock.acquire()
+            self._auth_event.clear()
             LOGGER.info("Not authenticated, changing that...")
-
             await self._authenticator.authenticate(self._client)
+            self._auth_event.set()
+            self._auth_lock.release()
 
-        return await self._get_page(url, params, retry_count + 1)
+        return await self._get_page(
+            url,
+            params,
+            check_course_id_valid=check_course_id_valid,
+            retry_count=retry_count + 1,
+        )
 
     @staticmethod
     def _is_logged_in(soup: bs4.BeautifulSoup) -> bool:
@@ -705,7 +803,7 @@ class IliasCrawler:
         video_table = soup.find(
             recursive=True,
             name="table",
-            attrs={"id": lambda x: x is not None and x.startswith("tbl_xoct")}
+            attrs={"id": lambda x: x is not None and x.startswith("tbl_xoct")},
         )
         if video_table is not None:
             LOGGER.debug("Auth: Found #tbl_xoct.+")

PFERD/ilias/date_demangler.py

@@ -25,15 +25,19 @@ def demangle_date(date: str) -> Optional[datetime.datetime]:
     saved = locale.setlocale(locale.LC_ALL)
     try:
         try:
-            locale.setlocale(locale.LC_ALL, 'de_DE.UTF-8')
+            locale.setlocale(locale.LC_ALL, "de_DE.UTF-8")
         except locale.Error:
             PRETTY.warning(
                 "Could not set language to german. Assuming you use english everywhere."
             )
 
         date = re.sub(r"\s+", " ", date)
-        date = re.sub("Gestern|Yesterday", _yesterday().strftime("%d. %b %Y"), date, re.I)
-        date = re.sub("Heute|Today", datetime.date.today().strftime("%d. %b %Y"), date, re.I)
+        date = re.sub(
+            "Gestern|Yesterday", _yesterday().strftime("%d. %b %Y"), date, re.I
+        )
+        date = re.sub(
+            "Heute|Today", datetime.date.today().strftime("%d. %b %Y"), date, re.I
+        )
         date = re.sub("Morgen|Tomorrow", _tomorrow().strftime("%d. %b %Y"), date, re.I)
         return datetime.datetime.strptime(date, "%d. %b %Y, %H:%M")
     except ValueError:

PFERD/ilias/downloader.py

@@ -7,9 +7,9 @@ import os
 from pathlib import Path, PurePath
 from typing import Callable, Awaitable, List, Optional, Union
 
+import asyncio
 import bs4
 import httpx
-import asyncio
 
 from ..errors import retry_on_io_exception
 from ..logging import PrettyLogger
@@ -36,7 +36,7 @@ class IliasDownloadInfo(Transformable):
         self,
         path: PurePath,
         url: Union[str, Callable[[], Awaitable[Optional[str]]]],
-            modifcation_date: Optional[datetime.datetime]
+        modifcation_date: Optional[datetime.datetime],
     ):
         super().__init__(path)
         if isinstance(url, str):
@@ -87,7 +87,7 @@ class IliasDownloader:
         client: httpx.Client,
         authenticator: IliasAuthenticator,
         strategy: IliasDownloadStrategy,
-            timeout: int = 5
+        timeout: int = 5,
     ):
         """
         Create a new IliasDownloader.
@@ -133,7 +133,9 @@ class IliasDownloader:
                 return True
 
         if not await download_impl():
-            PRETTY.error(f"Download of file {info.path} failed too often! Skipping it...")
+            PRETTY.error(
+                f"Download of file {info.path} failed too often! Skipping it..."
+            )
             return
 
         dst_path = self._organizer.accept_file(tmp_file, info.path)
@@ -142,8 +144,8 @@ class IliasDownloader:
                 dst_path,
                 times=(
                     math.ceil(info.modification_date.timestamp()),
-                    math.ceil(info.modification_date.timestamp())
-                )
+                    math.ceil(info.modification_date.timestamp()),
+                ),
             )
 
     async def _try_download(self, info: IliasDownloadInfo, target: Path) -> bool:
@@ -158,7 +160,9 @@ class IliasDownloader:
 
             if content_type.startswith("text/html") and not has_content_disposition:
                 if self._is_logged_in(soupify(response)):
-                    raise ContentTypeException("Attempting to download a web page, not a file")
+                    raise ContentTypeException(
+                        "Attempting to download a web page, not a file"
+                    )
 
                 return False
 

PFERD/ilias/syncronizer.py

@@ -0,0 +1,80 @@
+from typing import Callable, Awaitable, List, Optional
+
+from .authenticators import IliasAuthenticator
+from .crawler import (
+    IliasCrawler,
+    IliasDirectoryFilter,
+    IliasCrawlerEntry,
+    ResultContainer,
+)
+
+from ..utils import PathLike, to_path
+from ..cookie_jar import CookieJar
+
+
+class IliasSycronizer:
+    """
+    This class is used to manage a ILIAS Crawler
+    """
+
+    def __init__(
+        self,
+        base_url: str,
+        authenticator: IliasAuthenticator,
+        cookies: Optional[PathLike],
+        dir_filter: IliasDirectoryFilter,
+    ):
+        self._cookie_jar = CookieJar(to_path(cookies) if cookies else None)
+        self._cookie_jar.load_cookies()
+        self._authenticator = authenticator
+
+        self._client = self._cookie_jar.create_async_client()
+
+        self._crawler = IliasCrawler(
+            base_url, self._client, self._authenticator, dir_filter
+        )
+        self._targets = []
+
+    def add_target(
+        self,
+        crawl_function: Callable[[IliasCrawler], Awaitable[List[IliasCrawlerEntry]]],
+    ) -> ResultContainer:
+        """
+        Adds a crawl target and returns the ResultContainer, in which DownloadInfos will be saved
+
+        Arguments:
+            crawl_function {Callable[[IliasCrawler], Awaitable[List[IliasCrawlerEntry]]]} -- a callback which should return an awaitable list of IliasCrawlerEntrys
+        """
+        results = ResultContainer()
+        self._targets.append((crawl_function, results))
+        return results
+
+    def get_authenticator(self):
+        """
+        Returns the associated authenticator
+        """
+        return self._authenticator
+
+    def get_cookie_jar(self):
+        """
+        Returns the associated cookie jar
+        """
+        return self._cookie_jar
+
+    async def close_client(self):
+        """
+        Closes the async client
+        """
+        await self._client.aclose()
+
+    async def syncronize(self):
+        """
+        Syncronizes all registered targets
+        """
+        # Populate initial targets
+        entries = []
+        for (crawl_function, results) in self._targets:
+            entries.append((await crawl_function(self._crawler), results))
+
+        await self._crawler.iterate_entries_to_download_infos(entries)
+        self._cookie_jar.save_cookies()

PFERD/ipd.py

@@ -31,6 +31,7 @@ class IpdDownloadInfo(Transformable):
     """
     Information about an ipd entry.
     """
+
     url: str
     modification_date: Optional[datetime.datetime]
 
@@ -83,9 +84,16 @@ class IpdCrawler:
         items: List[IpdDownloadInfo] = []
 
         def is_relevant_url(x: str) -> bool:
-            return x.endswith(".pdf") or x.endswith(".c") or x.endswith(".java") or x.endswith(".zip")
+            return (
+                x.endswith(".pdf")
+                or x.endswith(".c")
+                or x.endswith(".java")
+                or x.endswith(".zip")
+            )
 
-        for link in page.findAll(name="a", attrs={"href": lambda x: x and is_relevant_url(x)}):
+        for link in page.findAll(
+            name="a", attrs={"href": lambda x: x and is_relevant_url(x)}
+        ):
             href: str = link.attrs.get("href")
             name = href.split("/")[-1]
 
@@ -94,15 +102,19 @@ class IpdCrawler:
                 enclosing_row: bs4.Tag = link.findParent(name="tr")
                 if enclosing_row:
                     date_text = enclosing_row.find(name="td").text
-                    modification_date = datetime.datetime.strptime(date_text, "%d.%m.%Y")
+                    modification_date = datetime.datetime.strptime(
+                        date_text, "%d.%m.%Y"
+                    )
             except ValueError:
                 modification_date = None
 
-            items.append(IpdDownloadInfo(
+            items.append(
+                IpdDownloadInfo(
                     Path(name),
                     url=self._abs_url_from_link(link),
-                modification_date=modification_date
-            ))
+                    modification_date=modification_date,
+                )
+            )
 
         return items
 
@@ -112,7 +124,9 @@ class IpdDownloader:
     A downloader for ipd files.
     """
 
-    def __init__(self, tmp_dir: TmpDir, organizer: Organizer, strategy: IpdDownloadStrategy):
+    def __init__(
+        self, tmp_dir: TmpDir, organizer: Organizer, strategy: IpdDownloadStrategy
+    ):
         self._tmp_dir = tmp_dir
         self._organizer = organizer
         self._strategy = strategy
@@ -144,11 +158,13 @@ class IpdDownloader:
                         dst_path,
                         times=(
                             math.ceil(info.modification_date.timestamp()),
-                            math.ceil(info.modification_date.timestamp())
-                        )
+                            math.ceil(info.modification_date.timestamp()),
+                        ),
                     )
 
             elif response.status_code == 403:
                 raise FatalException("Received 403. Are you not using the KIT VPN?")
             else:
-                PRETTY.warning(f"Could not download file, got response {response.status_code}")
+                PRETTY.warning(
+                    f"Could not download file, got response {response.status_code}"
+                )

PFERD/location.py

@@ -7,6 +7,7 @@ from pathlib import Path, PurePath
 
 class ResolveException(Exception):
     """An exception while resolving a file."""
+
     # TODO take care of this when doing exception handling
 
 

PFERD/logging.py

@@ -40,9 +40,9 @@ class RichLoggingHandler(logging.Handler):
 
     def __init__(self, level: int) -> None:
         super().__init__(level=level)
-        self.console = Console(theme=Theme({
-            "logging.level.warning": Style(color="yellow")
-        }))
+        self.console = Console(
+            theme=Theme({"logging.level.warning": Style(color="yellow")})
+        )
         self._log_render = LogRender(show_level=True, show_time=False, show_path=False)
 
     def emit(self, record: logging.LogRecord) -> None:
@@ -81,18 +81,14 @@ class PrettyLogger:
         """
         Print an error message indicating some operation fatally failed.
         """
-        self.logger.error(
-            f"[bold red]{message}[/bold red]"
-        )
+        self.logger.error(f"[bold red]{message}[/bold red]")
 
     def warning(self, message: str) -> None:
         """
         Print a warning message indicating some operation failed, but the error can be recovered
         or ignored.
         """
-        self.logger.warning(
-            f"[bold yellow]{message}[/bold yellow]"
-        )
+        self.logger.warning(f"[bold yellow]{message}[/bold yellow]")
 
     def modified_file(self, path: PathLike) -> None:
         """
@@ -108,18 +104,14 @@ class PrettyLogger:
         A new file has been downloaded.
         """
 
-        self.logger.info(
-            f"[bold green]Created {self._format_path(path)}.[/bold green]"
-        )
+        self.logger.info(f"[bold green]Created {self._format_path(path)}.[/bold green]")
 
     def deleted_file(self, path: PathLike) -> None:
         """
         A file has been deleted.
         """
 
-        self.logger.info(
-            f"[bold red]Deleted {self._format_path(path)}.[/bold red]"
-        )
+        self.logger.info(f"[bold red]Deleted {self._format_path(path)}.[/bold red]")
 
     def ignored_file(self, path: PathLike, reason: str) -> None:
         """
@@ -127,8 +119,7 @@ class PrettyLogger:
         """
 
         self.logger.info(
-            f"[dim]Ignored {self._format_path(path)} "
-            f"([/dim]{reason}[dim]).[/dim]"
+            f"[dim]Ignored {self._format_path(path)} " f"([/dim]{reason}[dim]).[/dim]"
         )
 
     def searching(self, path: PathLike) -> None:
@@ -177,8 +168,10 @@ class PrettyLogger:
 
         subject_str = f"{subject} " if subject else ""
         self.logger.info("")
-        self.logger.info((
+        self.logger.info(
+            (
                 f"[bold cyan]Synchronizing "
                 f"{subject_str}to {self._format_path(target_directory)} "
                 f"using the {synchronizer_name} synchronizer.[/bold cyan]"
-        ))
+            )
+        )

PFERD/organizer.py

@@ -29,6 +29,7 @@ class ConflictType(Enum):
     MARKED_FILE_OVERWRITTEN: A file is written for the second+ time in this run
     FILE_DELETED: The file was deleted
     """
+
     FILE_OVERWRITTEN = "overwritten"
     MARKED_FILE_OVERWRITTEN = "marked_file_overwritten"
     FILE_DELETED = "deleted"
@@ -56,7 +57,9 @@ class FileConflictResolution(Enum):
 FileConflictResolver = Callable[[PurePath, ConflictType], FileConflictResolution]
 
 
-def resolve_prompt_user(_path: PurePath, conflict: ConflictType) -> FileConflictResolution:
+def resolve_prompt_user(
+    _path: PurePath, conflict: ConflictType
+) -> FileConflictResolution:
     """
     Resolves conflicts by asking the user if a file was written twice or will be deleted.
     """
@@ -72,7 +75,9 @@ class FileAcceptException(Exception):
 class Organizer(Location):
     """A helper for managing downloaded files."""
 
-    def __init__(self, path: Path, conflict_resolver: FileConflictResolver = resolve_prompt_user):
+    def __init__(
+        self, path: Path, conflict_resolver: FileConflictResolver = resolve_prompt_user
+    ):
         """Create a new organizer for a given path."""
         super().__init__(path)
         self._known_files: Set[Path] = set()
@@ -98,7 +103,7 @@ class Organizer(Location):
         # your path...
         # See:
         # https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#maximum-path-length-limitation
-        if os.name == 'nt':
+        if os.name == "nt":
             src_absolute = Path("\\\\?\\" + str(src.resolve()))
             dst_absolute = Path("\\\\?\\" + str(self.resolve(dst)))
         else:
@@ -116,7 +121,9 @@ class Organizer(Location):
         if self._is_marked(dst):
             PRETTY.warning(f"File {str(dst_absolute)!r} was already written!")
             conflict = ConflictType.MARKED_FILE_OVERWRITTEN
-            if self._resolve_conflict("Overwrite file?", dst_absolute, conflict, default=False):
+            if self._resolve_conflict(
+                "Overwrite file?", dst_absolute, conflict, default=False
+            ):
                 PRETTY.ignored_file(dst_absolute, "file was written previously")
                 return None
 
@@ -201,7 +208,9 @@ class Organizer(Location):
     def _delete_file_if_confirmed(self, path: Path) -> None:
         prompt = f"Do you want to delete {path}"
 
-        if self._resolve_conflict(prompt, path, ConflictType.FILE_DELETED, default=False):
+        if self._resolve_conflict(
+            prompt, path, ConflictType.FILE_DELETED, default=False
+        ):
             self.download_summary.add_deleted_file(path)
             path.unlink()
         else:

PFERD/pferd.py

@@ -4,20 +4,35 @@ Convenience functions for using PFERD.
 
 import logging
 from pathlib import Path
-from typing import Callable, Awaitable, List, Optional, Union
+from typing import List, Optional, Union
 import asyncio
 
 from .authenticators import UserPassAuthenticator
-from .cookie_jar import CookieJar
-from .diva import (DivaDownloader, DivaDownloadStrategy, DivaPlaylistCrawler,
-                   diva_download_new)
+from .diva import (
+    DivaDownloader,
+    DivaDownloadStrategy,
+    DivaPlaylistCrawler,
+    diva_download_new,
+)
 from .download_summary import DownloadSummary
 from .errors import FatalException, swallow_and_print_errors
-from .ilias import (IliasAuthenticator, IliasCrawler, IliasDirectoryFilter,
-                    IliasDownloader, IliasDownloadInfo, IliasDownloadStrategy,
-                    KitShibbolethAuthenticator, download_modified_or_new)
-from .ipd import (IpdCrawler, IpdDownloader, IpdDownloadInfo,
-                  IpdDownloadStrategy, ipd_download_new_or_modified)
+from .ilias import (
+    IliasDirectoryFilter,
+    IliasDownloader,
+    IliasDownloadInfo,
+    IliasDownloadStrategy,
+    KitShibbolethAuthenticator,
+    download_modified_or_new,
+    IliasSycronizer,
+    ResultContainer,
+)
+from .ipd import (
+    IpdCrawler,
+    IpdDownloader,
+    IpdDownloadInfo,
+    IpdDownloadStrategy,
+    ipd_download_new_or_modified,
+)
 from .location import Location
 from .logging import PrettyLogger, enable_logging
 from .organizer import FileConflictResolver, Organizer, resolve_prompt_user
@@ -32,6 +47,36 @@ LOGGER = logging.getLogger(__name__)
 PRETTY = PrettyLogger(LOGGER)
 
 
+class IliasTarget:
+    """
+    Used to store associated options for a crawl target and hold the a reference to the results container
+    """
+
+    def __init__(
+        self,
+        results: ResultContainer,
+        target: PathLike,
+        transform: Transform = lambda x: x,
+        download_strategy: IliasDownloadStrategy = download_modified_or_new,
+        clean: bool = True,
+        timeout: int = 5,
+        file_conflict_resolver: FileConflictResolver = resolve_prompt_user,
+    ):
+        self.results = results
+        self.target = target
+        self.transform = transform
+        self.download_strategy = download_strategy
+        self.clean = clean
+        self.timeout = timeout
+        self.file_conflict_resolver = file_conflict_resolver
+
+    def get_results(self) -> List[IliasDownloadInfo]:
+        """
+        Returns the results of the associated crawl target
+        """
+        return self.results.get_results()
+
+
 class Pferd(Location):
     # pylint: disable=too-many-arguments
     """
@@ -40,16 +85,14 @@ class Pferd(Location):
     """
 
     def __init__(
-            self,
-            base_dir: Path,
-            tmp_dir: Path = Path(".tmp"),
-            test_run: bool = False
+        self, base_dir: Path, tmp_dir: Path = Path(".tmp"), test_run: bool = False
     ):
         super().__init__(Path(base_dir))
 
         self._download_summary = DownloadSummary()
         self._tmp_dir = TmpDir(self.resolve(tmp_dir))
         self._test_run = test_run
+        self._ilias_targets: List[IliasTarget] = []
 
     @staticmethod
     def enable_logging() -> None:
@@ -73,114 +116,169 @@ class Pferd(Location):
         inner_auth = UserPassAuthenticator("ILIAS - Pferd.py", username, password)
         return KitShibbolethAuthenticator(inner_auth)
 
-    async def _ilias(
-            self,
-            target: PathLike,
-            base_url: str,
-            crawl_function: Callable[[IliasCrawler], Awaitable[List[IliasDownloadInfo]]],
-            authenticator: IliasAuthenticator,
-            cookies: Optional[PathLike],
-            dir_filter: IliasDirectoryFilter,
-            transform: Transform,
-            download_strategy: IliasDownloadStrategy,
-            timeout: int,
-            clean: bool = True,
-            file_conflict_resolver: FileConflictResolver = resolve_prompt_user
-    ) -> Organizer:
-        # pylint: disable=too-many-locals
-        cookie_jar = CookieJar(to_path(cookies) if cookies else None)
-        client = cookie_jar.create_client()
-        async_client = cookie_jar.create_async_client()
-        tmp_dir = self._tmp_dir.new_subdir()
-        organizer = Organizer(self.resolve(to_path(target)), file_conflict_resolver)
-
-        crawler = IliasCrawler(base_url, async_client, authenticator, dir_filter)
-        downloader = IliasDownloader(tmp_dir, organizer, client,
-                                     authenticator, download_strategy, timeout)
-
-        cookie_jar.load_cookies()
-        info = await crawl_function(crawler)
-        cookie_jar.save_cookies()
-
-
-        transformed = apply_transform(transform, info)
-        if self._test_run:
-            self._print_transformables(transformed)
-            return organizer
-
-        await downloader.download_all(transformed)
-        cookie_jar.save_cookies()
-
-        if clean:
-            organizer.cleanup()
-
-        await async_client.aclose()
-        return organizer
-
     @swallow_and_print_errors
     def ilias_kit(
         self,
-            target: PathLike,
-            course_id: str,
         dir_filter: IliasDirectoryFilter = lambda x, y: True,
-            transform: Transform = lambda x: x,
         cookies: Optional[PathLike] = None,
         username: Optional[str] = None,
         password: Optional[str] = None,
-            download_strategy: IliasDownloadStrategy = download_modified_or_new,
-            clean: bool = True,
-            timeout: int = 5,
-            file_conflict_resolver: FileConflictResolver = resolve_prompt_user
-    ) -> Organizer:
+    ) -> IliasSycronizer:
         """
-        Synchronizes a folder with the ILIAS instance of the KIT.
-
-        Arguments:
-            target {Path} -- the target path to write the data to
-            course_id {str} -- the id of the main course page (found in the URL after ref_id
-                when opening the course homepage)
+        Create a ILIAS Sycronizer for the ILIAS instance of the KIT.
 
         Keyword Arguments:
             dir_filter {IliasDirectoryFilter} -- A filter for directories. Will be applied on the
                 crawler level, these directories and all of their content is skipped.
                 (default: {lambdax:True})
-            transform {Transform} -- A transformation function for the output paths. Return None
-                to ignore a file. (default: {lambdax:x})
             cookies {Optional[Path]} -- The path to store and load cookies from.
                 (default: {None})
             username {Optional[str]} -- The SCC username. If none is given, it will prompt
                 the user. (default: {None})
             password {Optional[str]} -- The SCC password. If none is given, it will prompt
                 the user. (default: {None})
+        """
+
+        # This authenticator only works with the KIT ilias instance.
+        authenticator = Pferd._get_authenticator(username=username, password=password)
+        return IliasSycronizer(
+            "https://ilias.studium.kit.edu/", authenticator, cookies, dir_filter
+        )
+        # TODO: Format crawler output
+        ##PRETTY.starting_synchronizer(target, "ILIAS", course_id)
+
+    def add_ilias_personal_desktop(
+        self,
+        ilias: IliasSycronizer,
+        target: PathLike,
+        transform: Transform = lambda x: x,
+        download_strategy: IliasDownloadStrategy = download_modified_or_new,
+        clean: bool = True,
+        timeout: int = 5,
+        file_conflict_resolver: FileConflictResolver = resolve_prompt_user,
+    ):
+        """
+        Add the ILIAS "personal desktop" as a crawl target.
+        Arguments:
+            ilias {IliasSycronizer} -- the ILIAS Instance
+            target {Path} -- the target path to write the data to
+        Keyword Arguments:
+            transform {Transform} -- A transformation function for the output paths. Return None
+                to ignore a file. (default: {lambdax:x})
             download_strategy {DownloadStrategy} -- A function to determine which files need to
                 be downloaded. Can save bandwidth and reduce the number of requests.
                 (default: {download_modified_or_new})
             clean {bool} -- Whether to clean up when the method finishes.
-            timeout {int} -- The download timeout for opencast videos.
+            timeout {int} -- The download timeout for opencast videos. Sadly needed due to a
+                requests bug.
             file_conflict_resolver {FileConflictResolver} -- A function specifying how to deal
                 with overwriting or deleting files. The default always asks the user.
         """
-        # This authenticator only works with the KIT ilias instance.
-        authenticator = Pferd._get_authenticator(username=username, password=password)
-        PRETTY.starting_synchronizer(target, "ILIAS", course_id)
+        results = ilias.add_target(
+            lambda crawler: crawler.crawl_personal_desktop(),
+        )
+        target = IliasTarget(
+            results,
+            target,
+            transform,
+            download_strategy,
+            clean,
+            timeout,
+            file_conflict_resolver,
+        )
+        self._ilias_targets.append(target)
 
-        organizer = asyncio.run(self._ilias(
-            target=target,
-            base_url="https://ilias.studium.kit.edu/",
-            crawl_function=lambda crawler: crawler.crawl_course(course_id),
-            authenticator=authenticator,
-            cookies=cookies,
-            dir_filter=dir_filter,
-            transform=transform,
-            download_strategy=download_strategy,
-            clean=clean,
-            timeout=timeout,
-            file_conflict_resolver=file_conflict_resolver
-        ))
+    def add_ilias_folder(
+        self,
+        ilias: IliasSycronizer,
+        target: PathLike,
+        course_id: str,
+        transform: Transform = lambda x: x,
+        download_strategy: IliasDownloadStrategy = download_modified_or_new,
+        clean: bool = True,
+        timeout: int = 5,
+        file_conflict_resolver: FileConflictResolver = resolve_prompt_user,
+    ):
+        """
+        Add a course to syncronize
+
+        Arguments:
+            ilias {IliasSycronizer} -- the ILIAS Instance
+            target {Path} -- the target path to write the data to
+            course_id {str} -- the id of the main course page (found in the URL after ref_id
+                when opening the course homepage)
+        Keyword Arguments:
+            transform {Transform} -- A transformation function for the output paths. Return None
+                to ignore a file. (default: {lambdax:x})
+            download_strategy {DownloadStrategy} -- A function to determine which files need to
+                be downloaded. Can save bandwidth and reduce the number of requests.
+                (default: {download_modified_or_new})
+            clean {bool} -- Whether to clean up when the method finishes.
+            timeout {int} -- The download timeout for opencast videos. Sadly needed due to a
+                requests bug.
+            file_conflict_resolver {FileConflictResolver} -- A function specifying how to deal
+                with overwriting or deleting files. The default always asks the user.
+        """
+
+        results = ilias.add_target(
+            lambda crawler: crawler.crawl_course(course_id),
+        )
+        target = IliasTarget(
+            results,
+            target,
+            transform,
+            download_strategy,
+            clean,
+            timeout,
+            file_conflict_resolver,
+        )
+        self._ilias_targets.append(target)
+
+    async def _syncronize_ilias(self, ilias: IliasSycronizer):
+        await ilias.syncronize()
+
+        cookie_jar = ilias.get_cookie_jar()
+        cookie_jar.save_cookies()
+        authenticator = ilias.get_authenticator()
+
+        client = cookie_jar.create_client()
+        for entry in self._ilias_targets:
+            tmp_dir = self._tmp_dir.new_subdir()
+            organizer = Organizer(
+                self.resolve(to_path(entry.target)), entry.file_conflict_resolver
+            )
+
+            downloader = IliasDownloader(
+                tmp_dir,
+                organizer,
+                client,
+                authenticator,
+                entry.download_strategy,
+                entry.timeout,
+            )
+
+            transformed = apply_transform(entry.transform, entry.get_results())
+            if self._test_run:
+                self._print_transformables(transformed)
+                return organizer
+
+            await downloader.download_all(transformed)
+
+            if entry.clean:
+                organizer.cleanup()
 
             self._download_summary.merge(organizer.download_summary)
 
-        return organizer
+        await ilias.close_client()
+
+    def syncronize_ilias(self, ilias: IliasSycronizer):
+        """
+        Syncronize a given ilias instance
+
+        Arguments:
+            ilias {IliasSycronizer} -- the ILIAS Instance
+        """
+        asyncio.run(self._syncronize_ilias(ilias))
 
     def print_summary(self) -> None:
         """
@@ -188,136 +286,6 @@ class Pferd(Location):
         """
         PRETTY.summary(self._download_summary)
 
-    @swallow_and_print_errors
-    def ilias_kit_personal_desktop(
-            self,
-            target: PathLike,
-            dir_filter: IliasDirectoryFilter = lambda x, y: True,
-            transform: Transform = lambda x: x,
-            cookies: Optional[PathLike] = None,
-            username: Optional[str] = None,
-            password: Optional[str] = None,
-            download_strategy: IliasDownloadStrategy = download_modified_or_new,
-            clean: bool = True,
-            timeout: int = 5,
-            file_conflict_resolver: FileConflictResolver = resolve_prompt_user
-    ) -> Organizer:
-        """
-        Synchronizes a folder with the ILIAS instance of the KIT. This method will crawl the ILIAS
-        "personal desktop" instead of a single course.
-
-        Arguments:
-            target {Path} -- the target path to write the data to
-
-        Keyword Arguments:
-            dir_filter {IliasDirectoryFilter} -- A filter for directories. Will be applied on the
-                crawler level, these directories and all of their content is skipped.
-                (default: {lambdax:True})
-            transform {Transform} -- A transformation function for the output paths. Return None
-                to ignore a file. (default: {lambdax:x})
-            cookies {Optional[Path]} -- The path to store and load cookies from.
-                (default: {None})
-            username {Optional[str]} -- The SCC username. If none is given, it will prompt
-                the user. (default: {None})
-            password {Optional[str]} -- The SCC password. If none is given, it will prompt
-                the user. (default: {None})
-            download_strategy {DownloadStrategy} -- A function to determine which files need to
-                be downloaded. Can save bandwidth and reduce the number of requests.
-                (default: {download_modified_or_new})
-            clean {bool} -- Whether to clean up when the method finishes.
-            timeout {int} -- The download timeout for opencast videos. 
-            file_conflict_resolver {FileConflictResolver} -- A function specifying how to deal
-                with overwriting or deleting files. The default always asks the user.
-        """
-        # This authenticator only works with the KIT ilias instance.
-        authenticator = Pferd._get_authenticator(username, password)
-        PRETTY.starting_synchronizer(target, "ILIAS", "Personal Desktop")
-
-        organizer = asyncio.run(self._ilias(
-            target=target,
-            base_url="https://ilias.studium.kit.edu/",
-            crawl_function=lambda crawler: crawler.crawl_personal_desktop(),
-            authenticator=authenticator,
-            cookies=cookies,
-            dir_filter=dir_filter,
-            transform=transform,
-            download_strategy=download_strategy,
-            clean=clean,
-            timeout=timeout,
-            file_conflict_resolver=file_conflict_resolver
-        ))
-
-        self._download_summary.merge(organizer.download_summary)
-
-        return organizer
-
-    @swallow_and_print_errors
-    def ilias_kit_folder(
-            self,
-            target: PathLike,
-            full_url: str,
-            dir_filter: IliasDirectoryFilter = lambda x, y: True,
-            transform: Transform = lambda x: x,
-            cookies: Optional[PathLike] = None,
-            username: Optional[str] = None,
-            password: Optional[str] = None,
-            download_strategy: IliasDownloadStrategy = download_modified_or_new,
-            clean: bool = True,
-            timeout: int = 5,
-            file_conflict_resolver: FileConflictResolver = resolve_prompt_user
-    ) -> Organizer:
-        """
-        Synchronizes a folder with a given folder on the ILIAS instance of the KIT.
-
-        Arguments:
-            target {Path}  -- the target path to write the data to
-            full_url {str} -- the full url of the folder/videos/course to crawl
-
-        Keyword Arguments:
-            dir_filter {IliasDirectoryFilter} -- A filter for directories. Will be applied on the
-                crawler level, these directories and all of their content is skipped.
-                (default: {lambdax:True})
-            transform {Transform} -- A transformation function for the output paths. Return None
-                to ignore a file. (default: {lambdax:x})
-            cookies {Optional[Path]} -- The path to store and load cookies from.
-                (default: {None})
-            username {Optional[str]} -- The SCC username. If none is given, it will prompt
-                the user. (default: {None})
-            password {Optional[str]} -- The SCC password. If none is given, it will prompt
-                the user. (default: {None})
-            download_strategy {DownloadStrategy} -- A function to determine which files need to
-                be downloaded. Can save bandwidth and reduce the number of requests.
-                (default: {download_modified_or_new})
-            clean {bool} -- Whether to clean up when the method finishes.
-            timeout {int} -- The download timeout for opencast videos.
-            file_conflict_resolver {FileConflictResolver} -- A function specifying how to deal
-                with overwriting or deleting files. The default always asks the user.
-        """
-        # This authenticator only works with the KIT ilias instance.
-        authenticator = Pferd._get_authenticator(username=username, password=password)
-        PRETTY.starting_synchronizer(target, "ILIAS", "An ILIAS element by url")
-
-        if not full_url.startswith("https://ilias.studium.kit.edu"):
-            raise FatalException("Not a valid KIT ILIAS URL")
-
-        organizer = asyncio.run(self._ilias(
-            target=target,
-            base_url="https://ilias.studium.kit.edu/",
-            crawl_function=lambda crawler: crawler.recursive_crawl_url(full_url),
-            authenticator=authenticator,
-            cookies=cookies,
-            dir_filter=dir_filter,
-            transform=transform,
-            download_strategy=download_strategy,
-            clean=clean,
-            timeout=timeout,
-            file_conflict_resolver=file_conflict_resolver
-        ))
-
-        self._download_summary.merge(organizer.download_summary)
-
-        return organizer
-
     @swallow_and_print_errors
     def ipd_kit(
         self,
@@ -326,7 +294,7 @@ class Pferd(Location):
         transform: Transform = lambda x: x,
         download_strategy: IpdDownloadStrategy = ipd_download_new_or_modified,
         clean: bool = True,
-            file_conflict_resolver: FileConflictResolver = resolve_prompt_user
+        file_conflict_resolver: FileConflictResolver = resolve_prompt_user,
     ) -> Organizer:
         """
         Synchronizes a folder with a DIVA playlist.
@@ -365,7 +333,9 @@ class Pferd(Location):
             self._print_transformables(transformed)
             return organizer
 
-        downloader = IpdDownloader(tmp_dir=tmp_dir, organizer=organizer, strategy=download_strategy)
+        downloader = IpdDownloader(
+            tmp_dir=tmp_dir, organizer=organizer, strategy=download_strategy
+        )
         downloader.download_all(transformed)
 
         if clean:
@@ -383,7 +353,7 @@ class Pferd(Location):
         transform: Transform = lambda x: x,
         download_strategy: DivaDownloadStrategy = diva_download_new,
         clean: bool = True,
-            file_conflict_resolver: FileConflictResolver = resolve_prompt_user
+        file_conflict_resolver: FileConflictResolver = resolve_prompt_user,
     ) -> Organizer:
         """
         Synchronizes a folder with a DIVA playlist.

PFERD/progress.py

@@ -8,9 +8,15 @@ from typing import Optional, Type
 
 import httpx
 from rich.console import Console
-from rich.progress import (BarColumn, DownloadColumn, Progress, TaskID,
-                           TextColumn, TimeRemainingColumn,
-                           TransferSpeedColumn)
+from rich.progress import (
+    BarColumn,
+    DownloadColumn,
+    Progress,
+    TaskID,
+    TextColumn,
+    TimeRemainingColumn,
+    TransferSpeedColumn,
+)
 
 _progress: Progress = Progress(
     TextColumn("[bold blue]{task.fields[name]}", justify="right"),
@@ -23,7 +29,7 @@ _progress: Progress = Progress(
     "•",
     TimeRemainingColumn(),
     console=Console(file=sys.stdout),
-    transient=True
+    transient=True,
 )
 
 
@@ -47,11 +53,12 @@ class ProgressSettings:
     """
     Settings you can pass to customize the progress bar.
     """
+
     name: str
     max_size: int
 
 
-def progress_for(settings: Optional[ProgressSettings]) -> 'ProgressContextManager':
+def progress_for(settings: Optional[ProgressSettings]) -> "ProgressContextManager":
     """
     Returns a context manager that displays progress
 
@@ -70,16 +77,14 @@ class ProgressContextManager:
         self._settings = settings
         self._task_id: Optional[TaskID] = None
 
-    def __enter__(self) -> 'ProgressContextManager':
+    def __enter__(self) -> "ProgressContextManager":
         """Context manager entry function."""
         if not self._settings:
             return self
 
         _progress.start()
         self._task_id = _progress.add_task(
-            self._settings.name,
-            total=self._settings.max_size,
-            name=self._settings.name
+            self._settings.name, total=self._settings.max_size, name=self._settings.name
         )
         return self
 

PFERD/tmp_dir.py

@@ -25,7 +25,7 @@ class TmpDir(Location):
         """Format the folder as a string."""
         return f"Folder at {self.path}"
 
-    def __enter__(self) -> 'TmpDir':
+    def __enter__(self) -> "TmpDir":
         """Context manager entry function."""
         return self
 
@@ -52,7 +52,7 @@ class TmpDir(Location):
 
         return self.resolve(Path(name))
 
-    def new_subdir(self, prefix: Optional[str] = None) -> 'TmpDir':
+    def new_subdir(self, prefix: Optional[str] = None) -> "TmpDir":
         """
         Create a new nested temporary folder and return it.
         """

PFERD/transform.py

@@ -45,11 +45,14 @@ def apply_transform(
             result.append(transformable)
     return result
 
+
 # Transform combinators
 
+
 def keep(path: PurePath) -> Optional[PurePath]:
     return path
 
+
 def attempt(*args: Transform) -> Transform:
     def inner(path: PurePath) -> Optional[PurePath]:
         for transform in args:
@@ -57,11 +60,14 @@ def attempt(*args: Transform) -> Transform:
             if result:
                 return result
         return None
+
     return inner
 
+
 def optionally(transform: Transform) -> Transform:
     return attempt(transform, lambda path: path)
 
+
 def do(*args: Transform) -> Transform:
     def inner(path: PurePath) -> Optional[PurePath]:
         current = path
@@ -72,43 +78,56 @@ def do(*args: Transform) -> Transform:
             else:
                 return None
         return current
+
     return inner
 
+
 def predicate(pred: Callable[[PurePath], bool]) -> Transform:
     def inner(path: PurePath) -> Optional[PurePath]:
         if pred(path):
             return path
         return None
+
     return inner
 
+
 def glob(pattern: str) -> Transform:
     return predicate(lambda path: path.match(pattern))
 
+
 def move_dir(source_dir: PathLike, target_dir: PathLike) -> Transform:
     source_path = to_path(source_dir)
     target_path = to_path(target_dir)
+
     def inner(path: PurePath) -> Optional[PurePath]:
         if source_path in path.parents:
             return target_path / path.relative_to(source_path)
         return None
+
     return inner
 
+
 def move(source: PathLike, target: PathLike) -> Transform:
     source_path = to_path(source)
     target_path = to_path(target)
+
     def inner(path: PurePath) -> Optional[PurePath]:
         if path == source_path:
             return target_path
         return None
+
     return inner
 
+
 def rename(source: str, target: str) -> Transform:
     def inner(path: PurePath) -> Optional[PurePath]:
         if path.name == source:
             return path.with_name(target)
         return None
+
     return inner
 
+
 def re_move(regex: Regex, target: str) -> Transform:
     def inner(path: PurePath) -> Optional[PurePath]:
         match = to_pattern(regex).fullmatch(str(path))
@@ -117,8 +136,10 @@ def re_move(regex: Regex, target: str) -> Transform:
             groups.extend(match.groups())
             return PurePath(target.format(*groups))
         return None
+
     return inner
 
+
 def re_rename(regex: Regex, target: str) -> Transform:
     def inner(path: PurePath) -> Optional[PurePath]:
         match = to_pattern(regex).fullmatch(path.name)
@@ -127,6 +148,7 @@ def re_rename(regex: Regex, target: str) -> Transform:
             groups.extend(match.groups())
             return path.with_name(target.format(*groups))
         return None
+
     return inner
 
 
@@ -136,7 +158,7 @@ def sanitize_windows_path(path: PurePath) -> PurePath:
     This method is a no-op on other operating systems.
     """
     # Escape windows illegal path characters
-    if os.name == 'nt':
+    if os.name == "nt":
         sanitized_parts = [re.sub(r'[<>:"/|?]', "_", x) for x in list(path.parts)]
         return PurePath(*sanitized_parts)
     return path

PFERD/utils.py

@@ -62,7 +62,7 @@ def stream_to_path(
     else:
         settings = None
 
-    with open(target, 'wb') as file_descriptor:
+    with open(target, "wb") as file_descriptor:
         with progress_for(settings) as progress:
             for chunk in response.iter_bytes():
                 file_descriptor.write(chunk)