Bump version to 3.3.0

And do not assume we are logged in...

CHANGELOG.md

@@ -22,6 +22,23 @@ ambiguous situations.
 
 ## Unreleased
 
+## 3.3.0 - 2022-01-09
+
+### Added
+- A KIT IPD crawler
+- Support for ILIAS cards
+- (Rudimentary) support for content pages
+- Support for multi-stream videos
+- Support for ILIAS 7
+
+### Removed
+- [Interpolation](https://docs.python.org/3/library/configparser.html#interpolation-of-values) in config file
+
+### Fixed
+- Crawling of recursive courses
+- Crawling files directly placed on the personal desktop
+- Ignore timestamps at the unix epoch as they crash on windows
+
 ## 3.2.0 - 2021-08-04
 
 ### Added

CONFIG.md

@@ -4,11 +4,11 @@ A config file consists of sections. A section begins with a `[section]` header,
 which is followed by a list of `key = value` pairs. Comments must be on their
 own line and start with `#`. Multiline values must be indented beyond their key.
 Boolean values can be `yes` or `no`. For more details and some examples on the
-format, see the [configparser documentation][1] ([basic interpolation][2] is
-enabled).
+format, see the [configparser documentation][1] ([interpolation][2] is
+disabled).
 
 [1]: <https://docs.python.org/3/library/configparser.html#supported-ini-file-structure> "Supported INI File Structure"
-[2]: <https://docs.python.org/3/library/configparser.html#configparser.BasicInterpolation> "BasicInterpolation"
+[2]: <https://docs.python.org/3/library/configparser.html#interpolation-of-values> "Interpolation of values"
 
 ## The `DEFAULT` section
 
@@ -53,7 +53,7 @@ common to all crawlers:
   crawler can still be executed manually using the `--crawler` or `-C` flags.
   (Default: `no`)
 - `output_dir`: The directory the crawler synchronizes files to. A crawler will
-  never place any files outside of this directory. (Default: the crawler's name)
+  never place any files outside this directory. (Default: the crawler's name)
 - `redownload`: When to download a file that is already present locally.
   (Default: `never-smart`)
     - `never`: If a file is present locally, it is not downloaded again.
@@ -136,6 +136,18 @@ crawler simulate a slower, network-based crawler.
   requests. (Default: `0.0`)
 - `download_speed`: Download speed (in bytes per second) to simulate. (Optional)
 
+### The `kit-ipd` crawler
+
+This crawler crawls a KIT-IPD page by url. The root page can be crawled from
+outside the KIT network so you will be informed about any new/deleted files,
+but downloading files requires you to be within. Adding a show delay between
+requests is likely a good idea.
+
+- `target`: URL to a KIT-IPD page
+- `link_regex`: A regex that is matched against the `href` part of links. If it
+  matches, the given link is downloaded as a file. This is used to extract
+  files from KIT-IPD pages. (Default: `^.*/[^/]*\.(?:pdf|zip|c|java)$`)
+
 ### The `kit-ilias-web` crawler
 
 This crawler crawls the KIT ILIAS instance.

LICENSE

@@ -1,4 +1,5 @@
-Copyright 2019-2020 Garmelon, I-Al-Istannen, danstooamerican, pavelzw, TheChristophe, Scriptim
+Copyright 2019-2021 Garmelon, I-Al-Istannen, danstooamerican, pavelzw,
+                    TheChristophe, Scriptim, thelukasprobst, Toorero
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in

PFERD/__main__.py

@@ -15,7 +15,7 @@ from .transformer import RuleParseError
 
 def load_config_parser(args: argparse.Namespace) -> configparser.ConfigParser:
     log.explain_topic("Loading config")
-    parser = configparser.ConfigParser()
+    parser = configparser.ConfigParser(interpolation=None)
 
     if args.command is None:
         log.explain("No CLI command specified, loading config from file")

PFERD/cli/__init__.py

@@ -9,4 +9,5 @@
 
 from . import command_local  # noqa: F401 imported but unused
 from . import command_kit_ilias_web  # noqa: F401 imported but unused
+from . import command_kit_ipd  # noqa: F401 imported but unused
 from .parser import PARSER, ParserLoadError, load_default_section  # noqa: F401 imported but unused

PFERD/cli/command_kit_ipd.py

@@ -0,0 +1,54 @@
+import argparse
+import configparser
+from pathlib import Path
+
+from ..logging import log
+from .parser import CRAWLER_PARSER, SUBPARSERS, load_crawler
+
+SUBPARSER = SUBPARSERS.add_parser(
+    "kit-ipd",
+    parents=[CRAWLER_PARSER],
+)
+
+GROUP = SUBPARSER.add_argument_group(
+    title="kit ipd crawler arguments",
+    description="arguments for the 'kit-ipd' crawler",
+)
+GROUP.add_argument(
+    "--link-regex",
+    type=str,
+    metavar="REGEX",
+    help="href-matching regex to identify downloadable files"
+)
+GROUP.add_argument(
+    "target",
+    type=str,
+    metavar="TARGET",
+    help="url to crawl"
+)
+GROUP.add_argument(
+    "output",
+    type=Path,
+    metavar="OUTPUT",
+    help="output directory"
+)
+
+
+def load(
+        args: argparse.Namespace,
+        parser: configparser.ConfigParser,
+) -> None:
+    log.explain("Creating config for command 'kit-ipd'")
+
+    parser["crawl:kit-ipd"] = {}
+    section = parser["crawl:kit-ipd"]
+    load_crawler(args, section)
+
+    section["type"] = "kit-ipd"
+    section["target"] = str(args.target)
+    section["output_dir"] = str(args.output)
+    if args.link_regex:
+        section["link_regex"] = str(args.link_regex)
+
+
+SUBPARSER.set_defaults(command=load)

PFERD/crawl/__init__.py

@@ -5,6 +5,7 @@ from ..auth import Authenticator
 from ..config import Config
 from .crawler import Crawler, CrawlError, CrawlerSection  # noqa: F401
 from .ilias import KitIliasWebCrawler, KitIliasWebCrawlerSection
+from .kit_ipd_crawler import KitIpdCrawler, KitIpdCrawlerSection
 from .local_crawler import LocalCrawler, LocalCrawlerSection
 
 CrawlerConstructor = Callable[[
@@ -19,4 +20,6 @@ CRAWLERS: Dict[str, CrawlerConstructor] = {
         LocalCrawler(n, LocalCrawlerSection(s), c),
     "kit-ilias-web": lambda n, s, c, a:
         KitIliasWebCrawler(n, KitIliasWebCrawlerSection(s), c, a),
+    "kit-ipd": lambda n, s, c, a:
+        KitIpdCrawler(n, KitIpdCrawlerSection(s), c),
 }

PFERD/crawl/crawler.py

@@ -47,10 +47,12 @@ def noncritical(f: Wrapped) -> Wrapped:
         try:
             f(*args, **kwargs)
         except (CrawlWarning, OutputDirError, MarkDuplicateError, MarkConflictError) as e:
+            crawler.report.add_warning(str(e))
             log.warn(str(e))
             crawler.error_free = False
-        except:  # noqa: E722 do not use bare 'except'
+        except Exception as e:
             crawler.error_free = False
+            crawler.report.add_error(str(e))
             raise
 
     return wrapper  # type: ignore
@@ -83,8 +85,10 @@ def anoncritical(f: AWrapped) -> AWrapped:
         except (CrawlWarning, OutputDirError, MarkDuplicateError, MarkConflictError) as e:
             log.warn(str(e))
             crawler.error_free = False
-        except:  # noqa: E722 do not use bare 'except'
+            crawler.report.add_warning(str(e))
+        except Exception as e:
             crawler.error_free = False
+            crawler.report.add_error(str(e))
             raise
 
         return None

PFERD/crawl/ilias/kit_ilias_html.py

@@ -39,7 +39,12 @@ class IliasPageElement:
     description: Optional[str] = None
 
     def id(self) -> str:
-        regexes = [r"eid=(?P<id>[0-9a-z\-]+)", r"file_(?P<id>\d+)", r"ref_id=(?P<id>\d+)"]
+        regexes = [
+            r"eid=(?P<id>[0-9a-z\-]+)",
+            r"file_(?P<id>\d+)",
+            r"ref_id=(?P<id>\d+)",
+            r"target=[a-z]+_(?P<id>\d+)"
+        ]
 
         for regex in regexes:
             if match := re.search(regex, self.url):
@@ -71,6 +76,12 @@ class IliasPage:
         if self._is_exercise_file():
             log.explain("Page is an exercise, searching for elements")
             return self._find_exercise_entries()
+        if self._is_personal_desktop():
+            log.explain("Page is the personal desktop, searching for elements")
+            return self._find_personal_desktop_entries()
+        if self._is_content_page():
+            log.explain("Page is a content page, searching for elements")
+            return self._find_copa_entries()
         log.explain("Page is a normal folder, searching for elements")
         return self._find_normal_entries()
 
@@ -115,13 +126,22 @@ class IliasPage:
 
         return False
 
+    def _is_personal_desktop(self) -> bool:
+        return self._soup.find("a", attrs={"href": lambda x: x and "block_type=pditems" in x})
+
+    def _is_content_page(self) -> bool:
+        link = self._soup.find(id="current_perma_link")
+        if not link:
+            return False
+        return "target=copa_" in link.get("value")
+
     def _player_to_video(self) -> List[IliasPageElement]:
         # 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
         # on the page, but defined in a JS object inside a script tag, passed to the player
         # library.
         # We do the impossible and RegEx the stream JSON object out of the page's HTML source
-        regex: re.Pattern[str] = re.compile(
+        regex = re.compile(
             r"({\"streams\"[\s\S]+?),\s*{\"paella_config_file", re.IGNORECASE
         )
         json_match = regex.search(str(self._soup))
@@ -133,10 +153,64 @@ class IliasPage:
 
         # parse it
         json_object = json.loads(json_str)
-        # and fetch the video url!
-        video_url = json_object["streams"][0]["sources"]["mp4"][0]["src"]
+        streams = [stream for stream in json_object["streams"]]
+
+        # and just fetch the lone video url!
+        if len(streams) == 1:
+            video_url = streams[0]["sources"]["mp4"][0]["src"]
             return [IliasPageElement(IliasElementType.VIDEO, video_url, self._source_name)]
 
+        log.explain(f"Found multiple videos for stream at {self._source_name}")
+        items = []
+        for stream in sorted(streams, key=lambda stream: stream["content"]):
+            full_name = f"{self._source_name.replace('.mp4', '')} ({stream['content']}).mp4"
+            video_url = stream["sources"]["mp4"][0]["src"]
+            items.append(IliasPageElement(IliasElementType.VIDEO, video_url, full_name))
+
+        return items
+
+    def _find_personal_desktop_entries(self) -> List[IliasPageElement]:
+        items: List[IliasPageElement] = []
+
+        titles: List[Tag] = self._soup.select(".il-item-title")
+        for title in titles:
+            link = title.find("a")
+            name = _sanitize_path_name(link.text.strip())
+            url = self._abs_url_from_link(link)
+
+            type = self._find_type_from_link(name, link, url)
+            if not type:
+                _unexpected_html_warning()
+                log.warn_contd(f"Could not extract type for {link}")
+                continue
+
+            log.explain(f"Found {name!r}")
+
+            if type == IliasElementType.FILE and "_download" not in url:
+                url = re.sub(r"(target=file_\d+)", r"\1_download", url)
+                log.explain("Rewired file URL to include download part")
+
+            items.append(IliasPageElement(type, url, name))
+
+        return items
+
+    def _find_copa_entries(self) -> List[IliasPageElement]:
+        items: List[IliasPageElement] = []
+        links: List[Tag] = self._soup.findAll(class_="ilc_flist_a_FileListItemLink")
+
+        for link in links:
+            url = self._abs_url_from_link(link)
+            name = _sanitize_path_name(link.getText().strip().replace("\t", ""))
+
+            if "file_id" not in url:
+                _unexpected_html_warning()
+                log.warn_contd(f"Found unknown content page item {name!r} with url {url!r}")
+                continue
+
+            items.append(IliasPageElement(IliasElementType.FILE, url, name))
+
+        return items
+
     def _find_video_entries(self) -> List[IliasPageElement]:
         # ILIAS has three stages for video pages
         # 1. The initial dummy page without any videos. This page contains the link to the listing
@@ -356,6 +430,8 @@ class IliasPage:
             log.explain(f"Found {element_name!r}")
             result.append(IliasPageElement(element_type, abs_url, element_name, description=description))
 
+        result += self._find_cards()
+
         return result
 
     def _find_upwards_folder_hierarchy(self, tag: Tag) -> List[str]:
@@ -383,7 +459,10 @@ class IliasPage:
                     continue
                 prev: Tag = parent.findPreviousSibling("div")
                 if "ilContainerBlockHeader" in prev.get("class"):
+                    if prev.find("h3"):
                         found_titles.append(prev.find("h3").getText().strip())
+                    else:
+                        found_titles.append(prev.find("h2").getText().strip())
 
             # And this for real accordions
             if "il_VAccordionContentDef" in parent.get("class"):
@@ -438,6 +517,90 @@ class IliasPage:
         log.explain(f"Found file {full_path!r}")
         return IliasPageElement(IliasElementType.FILE, url, full_path, modification_date)
 
+    def _find_cards(self) -> List[IliasPageElement]:
+        result: List[IliasPageElement] = []
+
+        card_titles: List[Tag] = self._soup.select(".card-title a")
+
+        for title in card_titles:
+            url = self._abs_url_from_link(title)
+            name = _sanitize_path_name(title.getText().strip())
+            type = self._find_type_from_card(title)
+
+            if not type:
+                _unexpected_html_warning()
+                log.warn_contd(f"Could not extract type for {title}")
+                continue
+
+            result.append(IliasPageElement(type, url, name))
+
+        card_button_tiles: List[Tag] = self._soup.select(".card-title button")
+
+        for button in card_button_tiles:
+            regex = re.compile(button["id"] + r".*window.open\(['\"](.+?)['\"]")
+            res = regex.search(str(self._soup))
+            if not res:
+                _unexpected_html_warning()
+                log.warn_contd(f"Could not find click handler target for {button}")
+                continue
+            url = self._abs_url_from_relative(res.group(1))
+            name = _sanitize_path_name(button.getText().strip())
+            type = self._find_type_from_card(button)
+            caption_parent = button.findParent(
+                "div",
+                attrs={"class": lambda x: x and "caption" in x},
+            )
+            description = caption_parent.find_next_sibling("div").getText().strip()
+
+            if not type:
+                _unexpected_html_warning()
+                log.warn_contd(f"Could not extract type for {button}")
+                continue
+
+            result.append(IliasPageElement(type, url, name, description=description))
+
+        return result
+
+    def _find_type_from_card(self, card_title: Tag) -> Optional[IliasElementType]:
+        def is_card_root(element: Tag) -> bool:
+            return "il-card" in element["class"] and "thumbnail" in element["class"]
+
+        card_root: Optional[Tag] = None
+
+        # We look for the card root
+        for parent in card_title.parents:
+            if is_card_root(parent):
+                card_root = parent
+                break
+
+        if card_root is None:
+            _unexpected_html_warning()
+            log.warn_contd(f"Tried to figure out element type, but did not find an icon for {card_title}")
+            return None
+
+        icon: Tag = card_root.select_one(".il-card-repository-head .icon")
+
+        if "opencast" in icon["class"]:
+            return IliasElementType.VIDEO_FOLDER_MAYBE_PAGINATED
+        if "exc" in icon["class"]:
+            return IliasElementType.EXERCISE
+        if "webr" in icon["class"]:
+            return IliasElementType.LINK
+        if "book" in icon["class"]:
+            return IliasElementType.BOOKING
+        if "frm" in icon["class"]:
+            return IliasElementType.FORUM
+        if "sess" in icon["class"]:
+            return IliasElementType.MEETING
+        if "tst" in icon["class"]:
+            return IliasElementType.TEST
+        if "fold" in icon["class"]:
+            return IliasElementType.FOLDER
+
+        _unexpected_html_warning()
+        log.warn_contd(f"Could not extract type from {icon} for card title {card_title}")
+        return None
+
     @staticmethod
     def _find_type_from_link(
             element_name: str,
@@ -453,9 +616,30 @@ class IliasPage:
         if "target=file_" in parsed_url.query:
             return IliasElementType.FILE
 
+        if "target=grp_" in parsed_url.query:
+            return IliasElementType.FOLDER
+
+        if "target=crs_" in parsed_url.query:
+            return IliasElementType.FOLDER
+
+        if "baseClass=ilExerciseHandlerGUI" in parsed_url.query:
+            return IliasElementType.EXERCISE
+
+        if "baseClass=ilLinkResourceHandlerGUI" in parsed_url.query and "calldirectlink" in parsed_url.query:
+            return IliasElementType.LINK
+
+        if "cmd=showThreads" in parsed_url.query or "target=frm_" in parsed_url.query:
+            return IliasElementType.FORUM
+
+        if "cmdClass=ilobjtestgui" in parsed_url.query:
+            return IliasElementType.TEST
+
+        # Booking and Meeting can not be detected based on the link. They do have a ref_id though, so
+        # try to guess it from the image.
+
         # Everything with a ref_id can *probably* be opened to reveal nested things
         # video groups, directories, exercises, etc
-        if "ref_id=" in parsed_url.query:
+        if "ref_id=" in parsed_url.query or "goto.php" in parsed_url.path:
             return IliasPage._find_type_from_folder_like(link_element, url)
 
         _unexpected_html_warning()
@@ -476,7 +660,7 @@ class IliasPage:
         # We look for the outer div of our inner link, to find information around it
         # (mostly the icon)
         for parent in link_element.parents:
-            if "ilContainerListItemOuter" in parent["class"]:
+            if "ilContainerListItemOuter" in parent["class"] or "il-std-item" in parent["class"]:
                 found_parent = parent
                 break
 
@@ -488,6 +672,9 @@ class IliasPage:
         # Find the small descriptive icon to figure out the type
         img_tag: Optional[Tag] = found_parent.select_one("img.ilListItemIcon")
 
+        if img_tag is None:
+            img_tag = found_parent.select_one("img.icon")
+
         if img_tag is None:
             _unexpected_html_warning()
             log.warn_contd(f"Tried to figure out element type, but did not find an image for {url}")
@@ -538,7 +725,13 @@ class IliasPage:
         """
         Create an absolute url from an <a> tag.
         """
-        return urljoin(self._page_url, link_tag.get("href"))
+        return self._abs_url_from_relative(link_tag.get("href"))
+
+    def _abs_url_from_relative(self, relative_url: str) -> str:
+        """
+        Create an absolute url from a relative URL.
+        """
+        return urljoin(self._page_url, relative_url)
 
 
 def _unexpected_html_warning() -> None:

PFERD/crawl/ilias/kit_ilias_web_crawler.py

@@ -1,7 +1,7 @@
 import asyncio
 import re
 from pathlib import PurePath
-from typing import Any, Awaitable, Callable, Dict, List, Optional, Set, TypeVar, Union
+from typing import Any, Awaitable, Callable, Dict, List, Optional, Set, TypeVar, Union, cast
 
 import aiohttp
 from aiohttp import hdrs
@@ -84,7 +84,7 @@ _VIDEO_ELEMENTS: Set[IliasElementType] = set([
 AWrapped = TypeVar("AWrapped", bound=Callable[..., Awaitable[Optional[Any]]])
 
 
-def _iorepeat(attempts: int, name: str) -> Callable[[AWrapped], AWrapped]:
+def _iorepeat(attempts: int, name: str, failure_is_error: bool = False) -> Callable[[AWrapped], AWrapped]:
     def decorator(f: AWrapped) -> AWrapped:
         async def wrapper(*args: Any, **kwargs: Any) -> Optional[Any]:
             last_exception: Optional[BaseException] = None
@@ -105,6 +105,9 @@ def _iorepeat(attempts: int, name: str) -> Callable[[AWrapped], AWrapped]:
 
             if last_exception:
                 message = f"Error in I/O Operation: {last_exception}"
+                if failure_is_error:
+                    raise CrawlError(message) from last_exception
+                else:
                     raise CrawlWarning(message) from last_exception
             raise CrawlError("Impossible return in ilias _iorepeat")
 
@@ -179,6 +182,7 @@ instance's greatest bottleneck.
         self._link_file_redirect_delay = section.link_redirect_delay()
         self._links = section.links()
         self._videos = section.videos()
+        self._visited_urls: Set[str] = set()
 
     async def _run(self) -> None:
         if isinstance(self._target, int):
@@ -200,7 +204,9 @@ instance's greatest bottleneck.
         await self._crawl_url(root_url, expected_id=course_id)
 
     async def _crawl_desktop(self) -> None:
-        await self._crawl_url(self._base_url)
+        appendix = r"ILIAS\PersonalDesktop\PDMainBarProvider|mm_pd_sel_items"
+        appendix = appendix.encode("ASCII").hex()
+        await self._crawl_url(self._base_url + "/gs_content.php?item=" + appendix)
 
     async def _crawl_url(self, url: str, expected_id: Optional[int] = None) -> None:
         maybe_cl = await self.crawl(PurePath("."))
@@ -251,6 +257,7 @@ instance's greatest bottleneck.
             return None
         return self._crawl_ilias_page(url, parent, maybe_cl)
 
+    @anoncritical
     async def _crawl_ilias_page(
         self,
         url: str,
@@ -292,15 +299,23 @@ instance's greatest bottleneck.
         # And execute them
         await self.gather(tasks)
 
+    # These decorators only apply *to this method* and *NOT* to the returned
+    # awaitables!
+    # This method does not await the handlers but returns them instead.
+    # This ensures one level is handled at a time and name deduplication
+    # works correctly.
     @anoncritical
-    # Shouldn't happen but we also really don't want to let I/O errors bubble up to anoncritical.
-    # If that happens we will be terminated as anoncritical doesn't tream them as non-critical.
-    @_wrap_io_in_warning("handling ilias element")
     async def _handle_ilias_element(
         self,
         parent_path: PurePath,
         element: IliasPageElement,
     ) -> Optional[Awaitable[None]]:
+        if element.url in self._visited_urls:
+            raise CrawlWarning(
+                f"Found second path to element {element.name!r} at {element.url!r}. Aborting subpath"
+            )
+        self._visited_urls.add(element.url)
+
         element_path = PurePath(parent_path, element.name)
 
         if element.type in _VIDEO_ELEMENTS:
@@ -363,6 +378,7 @@ instance's greatest bottleneck.
 
         return self._download_link(element, link_template_maybe, maybe_dl)
 
+    @anoncritical
     @_iorepeat(3, "resolving link")
     async def _download_link(self, element: IliasPageElement, link_template: str, dl: DownloadToken) -> None:
         async with dl as (bar, sink):
@@ -409,6 +425,7 @@ instance's greatest bottleneck.
 
         return self._download_booking(element, link_template_maybe, maybe_dl)
 
+    @anoncritical
     @_iorepeat(3, "resolving booking")
     async def _download_booking(
         self,
@@ -439,22 +456,103 @@ instance's greatest bottleneck.
         element: IliasPageElement,
         element_path: PurePath,
     ) -> Optional[Awaitable[None]]:
-        # Videos will NOT be redownloaded - their content doesn't really change and they are chunky
-        maybe_dl = await self.download(element_path, mtime=element.mtime, redownload=Redownload.NEVER)
-        if not maybe_dl:
+        # Copy old mapping as it is likely still relevant
+        if self.prev_report:
+            self.report.add_custom_value(
+                str(element_path),
+                self.prev_report.get_custom_value(str(element_path))
+            )
+
+        # A video might contain other videos, so let's "crawl" the video first
+        # to ensure rate limits apply. This must be a download as *this token*
+        # is re-used if the video consists of a single stream. In that case the
+        # file name is used and *not* the stream name the ilias html parser reported
+        # to ensure backwards compatibility.
+        maybe_dl = await self.download(element_path, mtime=element.mtime, redownload=Redownload.ALWAYS)
+
+        # If we do not want to crawl it (user filter) or we have every file
+        # from the cached mapping already, we can ignore this and bail
+        if not maybe_dl or self._all_videos_locally_present(element_path):
+            # Mark all existing cideos as known so they do not get deleted
+            # during dleanup. We "downloaded" them, just without actually making
+            # a network request as we assumed they did not change.
+            for video in self._previous_contained_videos(element_path):
+                await self.download(video)
+
             return None
 
-        return self._download_video(element, maybe_dl)
+        return self._download_video(element_path, element, maybe_dl)
 
+    def _previous_contained_videos(self, video_path: PurePath) -> List[PurePath]:
+        if not self.prev_report:
+            return []
+        custom_value = self.prev_report.get_custom_value(str(video_path))
+        if not custom_value:
+            return []
+        names = cast(List[str], custom_value)
+        folder = video_path.parent
+        return [PurePath(folder, name) for name in names]
+
+    def _all_videos_locally_present(self, video_path: PurePath) -> bool:
+        if contained_videos := self._previous_contained_videos(video_path):
+            log.explain_topic(f"Checking local cache for video {video_path.name}")
+            all_found_locally = True
+            for video in contained_videos:
+                transformed_path = self._transformer.transform(video)
+                if transformed_path:
+                    exists_locally = self._output_dir.resolve(transformed_path).exists()
+                    all_found_locally = all_found_locally and exists_locally
+            if all_found_locally:
+                log.explain("Found all videos locally, skipping enumeration request")
+                return True
+            log.explain("Missing at least one video, continuing with requests!")
+        return False
+
+    @anoncritical
     @_iorepeat(3, "downloading video")
-    async def _download_video(self, element: IliasPageElement, dl: DownloadToken) -> None:
+    async def _download_video(
+        self,
+        original_path: PurePath,
+        element: IliasPageElement,
+        dl: DownloadToken
+    ) -> None:
+        stream_elements: List[IliasPageElement] = []
         async with dl as (bar, sink):
             page = IliasPage(await self._get_page(element.url), element.url, element)
-            real_element = page.get_child_elements()[0]
+            stream_elements = page.get_child_elements()
 
-            log.explain(f"Streaming video from real url {real_element.url}")
+            if len(stream_elements) > 1:
+                log.explain(f"Found multiple video streams for {element.name}")
+            else:
+                log.explain(f"Using single video mode for {element.name}")
+                stream_element = stream_elements[0]
 
-            await self._stream_from_url(real_element.url, sink, bar, is_video=True)
+                transformed_path = self._transformer.transform(original_path)
+                if not transformed_path:
+                    raise CrawlError(f"Download returned a path but transform did not for {original_path}")
+
+                # We do not have a local cache yet
+                if self._output_dir.resolve(transformed_path).exists():
+                    log.explain(f"Video for {element.name} existed locally")
+                else:
+                    await self._stream_from_url(stream_element.url, sink, bar, is_video=True)
+                self.report.add_custom_value(str(original_path), [original_path.name])
+                return
+
+        contained_video_paths: List[str] = []
+
+        for stream_element in stream_elements:
+            video_path = original_path.parent / stream_element.name
+            contained_video_paths.append(str(video_path))
+
+            maybe_dl = await self.download(video_path, mtime=element.mtime, redownload=Redownload.NEVER)
+            if not maybe_dl:
+                continue
+            async with maybe_dl as (bar, sink):
+                log.explain(f"Streaming video from real url {stream_element.url}")
+                await self._stream_from_url(stream_element.url, sink, bar, is_video=True)
+
+        self.report.add_custom_value(str(original_path), contained_video_paths)
 
     async def _handle_file(
         self,
@@ -466,6 +564,7 @@ instance's greatest bottleneck.
             return None
         return self._download_file(element, maybe_dl)
 
+    @anoncritical
     @_iorepeat(3, "downloading file")
     async def _download_file(self, element: IliasPageElement, dl: DownloadToken) -> None:
         assert dl  # The function is only reached when dl is not None
@@ -521,16 +620,23 @@ instance's greatest bottleneck.
 
     # We repeat this as the login method in shibboleth doesn't handle I/O errors.
     # Shibboleth is quite reliable as well, the repeat is likely not critical here.
-    @_iorepeat(3, "Login")
+    @_iorepeat(3, "Login", failure_is_error=True)
     async def _authenticate(self) -> None:
         await self._shibboleth_login.login(self.session)
 
     @staticmethod
     def _is_logged_in(soup: BeautifulSoup) -> bool:
         # Normal ILIAS pages
-        userlog = soup.find("li", {"id": "userlog"})
-        if userlog is not None:
+        mainbar: Optional[Tag] = soup.find(class_="il-maincontrols-metabar")
+        if mainbar is not None:
+            login_button = mainbar.find("button", attrs={"data-action": lambda x: x and "login.php" in x})
+            shib_login = soup.find(id="button_shib_login")
+            return not login_button and not shib_login
+
+        # Personal Desktop
+        if soup.find("a", attrs={"href": lambda x: x and "block_type=pditems" in x}):
             return True
+
         # Video listing embeds do not have complete ILIAS html. Try to match them by
         # their video listing table
         video_table = soup.find(

PFERD/crawl/kit_ipd_crawler.py

@@ -0,0 +1,164 @@
+import os
+import re
+from dataclasses import dataclass
+from pathlib import PurePath
+from typing import Awaitable, List, Optional, Pattern, Set, Union
+from urllib.parse import urljoin
+
+from bs4 import BeautifulSoup, Tag
+
+from ..config import Config
+from ..logging import ProgressBar, log
+from ..output_dir import FileSink
+from ..utils import soupify
+from .crawler import CrawlError
+from .http_crawler import HttpCrawler, HttpCrawlerSection
+
+
+class KitIpdCrawlerSection(HttpCrawlerSection):
+    def target(self) -> str:
+        target = self.s.get("target")
+        if not target:
+            self.missing_value("target")
+
+        if not target.startswith("https://"):
+            self.invalid_value("target", target, "Should be a URL")
+
+        return target
+
+    def link_regex(self) -> Pattern[str]:
+        regex = self.s.get("link_regex", r"^.*/[^/]*\.(?:pdf|zip|c|java)$")
+        return re.compile(regex)
+
+
+@dataclass(unsafe_hash=True)
+class KitIpdFile:
+    name: str
+    url: str
+
+
+@dataclass
+class KitIpdFolder:
+    name: str
+    files: List[KitIpdFile]
+
+    def explain(self) -> None:
+        log.explain_topic(f"Folder {self.name!r}")
+        for file in self.files:
+            log.explain(f"File {file.name!r}")
+
+    def __hash__(self) -> int:
+        return self.name.__hash__()
+
+
+class KitIpdCrawler(HttpCrawler):
+
+    def __init__(
+            self,
+            name: str,
+            section: KitIpdCrawlerSection,
+            config: Config,
+    ):
+        super().__init__(name, section, config)
+        self._url = section.target()
+        self._file_regex = section.link_regex()
+
+    async def _run(self) -> None:
+        maybe_cl = await self.crawl(PurePath("."))
+        if not maybe_cl:
+            return
+
+        tasks: List[Awaitable[None]] = []
+
+        async with maybe_cl:
+            for item in await self._fetch_items():
+                if isinstance(item, KitIpdFolder):
+                    tasks.append(self._crawl_folder(item))
+                else:
+                    # Orphan files are placed in the root folder
+                    tasks.append(self._download_file(PurePath("."), item))
+
+        await self.gather(tasks)
+
+    async def _crawl_folder(self, folder: KitIpdFolder) -> None:
+        path = PurePath(folder.name)
+        if not await self.crawl(path):
+            return
+
+        tasks = [self._download_file(path, file) for file in folder.files]
+
+        await self.gather(tasks)
+
+    async def _download_file(self, parent: PurePath, file: KitIpdFile) -> None:
+        element_path = parent / file.name
+        maybe_dl = await self.download(element_path)
+        if not maybe_dl:
+            return
+
+        async with maybe_dl as (bar, sink):
+            await self._stream_from_url(file.url, sink, bar)
+
+    async def _fetch_items(self) -> Set[Union[KitIpdFile, KitIpdFolder]]:
+        page = await self.get_page()
+        elements: List[Tag] = self._find_file_links(page)
+        items: Set[Union[KitIpdFile, KitIpdFolder]] = set()
+
+        for element in elements:
+            folder_label = self._find_folder_label(element)
+            if folder_label:
+                folder = self._extract_folder(folder_label)
+                if folder not in items:
+                    items.add(folder)
+                    folder.explain()
+            else:
+                file = self._extract_file(element)
+                items.add(file)
+                log.explain_topic(f"Orphan file {file.name!r}")
+                log.explain("Attributing it to root folder")
+
+        return items
+
+    def _extract_folder(self, folder_tag: Tag) -> KitIpdFolder:
+        files: List[KitIpdFile] = []
+        name = folder_tag.getText().strip()
+
+        container: Tag = folder_tag.findNextSibling(name="table")
+        for link in self._find_file_links(container):
+            files.append(self._extract_file(link))
+
+        return KitIpdFolder(name, files)
+
+    @staticmethod
+    def _find_folder_label(file_link: Tag) -> Optional[Tag]:
+        enclosing_table: Tag = file_link.findParent(name="table")
+        if enclosing_table is None:
+            return None
+        return enclosing_table.findPreviousSibling(name=re.compile("^h[1-6]$"))
+
+    def _extract_file(self, link: Tag) -> KitIpdFile:
+        url = self._abs_url_from_link(link)
+        name = os.path.basename(url)
+        return KitIpdFile(name, url)
+
+    def _find_file_links(self, tag: Union[Tag, BeautifulSoup]) -> List[Tag]:
+        return tag.findAll(name="a", attrs={"href": self._file_regex})
+
+    def _abs_url_from_link(self, link_tag: Tag) -> str:
+        return urljoin(self._url, link_tag.get("href"))
+
+    async def _stream_from_url(self, url: str, sink: FileSink, bar: ProgressBar) -> None:
+        async with self.session.get(url, allow_redirects=False) as resp:
+            if resp.status == 403:
+                raise CrawlError("Received a 403. Are you within the KIT network/VPN?")
+            if resp.content_length:
+                bar.set_total(resp.content_length)
+
+            async for data in resp.content.iter_chunked(1024):
+                sink.file.write(data)
+                bar.advance(len(data))
+
+            sink.done()
+
+    async def get_page(self) -> BeautifulSoup:
+        async with self.session.get(self._url) as request:
+            return soupify(await request.read())

PFERD/logging.py

@@ -5,7 +5,7 @@ from contextlib import asynccontextmanager, contextmanager
 # TODO In Python 3.9 and above, ContextManager is deprecated
 from typing import AsyncIterator, ContextManager, Iterator, List, Optional
 
-from rich.console import Console, RenderGroup
+from rich.console import Console, Group
 from rich.live import Live
 from rich.markup import escape
 from rich.panel import Panel
@@ -68,7 +68,7 @@ class Log:
         if self._download_progress.task_ids:
             elements.append(self._download_progress)
 
-        group = RenderGroup(*elements)  # type: ignore
+        group = Group(*elements)  # type: ignore
         self._live.update(group)
 
     @contextmanager

PFERD/output_dir.py

@@ -231,7 +231,10 @@ class OutputDirectory:
         stat = local_path.stat()
 
         remote_newer = None
-        if mtime := heuristics.mtime:
+
+        # Python on Windows crashes when faced with timestamps around the unix epoch
+        if heuristics.mtime and (os.name != "nt" or heuristics.mtime.year > 1970):
+            mtime = heuristics.mtime
             remote_newer = mtime.timestamp() > stat.st_mtime
             if remote_newer:
                 log.explain("Remote file seems to be newer")

PFERD/pferd.py

@@ -182,5 +182,13 @@ class Pferd:
                 something_changed = True
                 log.report(f"  [bold bright_magenta]Not deleted[/] {fmt_path(path)}")
 
+            for warning in crawler.report.encountered_warnings:
+                something_changed = True
+                log.report(f"  [bold bright_red]Warning[/] {warning}")
+
+            for error in crawler.report.encountered_errors:
+                something_changed = True
+                log.report(f"  [bold bright_red]Error[/] {error}")
+
             if not something_changed:
                 log.report("  Nothing changed")

PFERD/report.py

@@ -1,6 +1,6 @@
 import json
 from pathlib import Path, PurePath
-from typing import Any, Dict, List, Set
+from typing import Any, Dict, List, Optional, Set
 
 
 class ReportLoadError(Exception):
@@ -68,6 +68,13 @@ class Report:
         # Files that should have been deleted by the cleanup but weren't
         self.not_deleted_files: Set[PurePath] = set()
 
+        # Custom crawler-specific data
+        self.custom: Dict[str, Any] = dict()
+
+        # Encountered errors and warnings
+        self.encountered_warnings: List[str] = []
+        self.encountered_errors: List[str] = []
+
     @staticmethod
     def _get_list_of_strs(data: Dict[str, Any], key: str) -> List[str]:
         result: Any = data.get(key, [])
@@ -81,6 +88,15 @@ class Report:
 
         return result
 
+    @staticmethod
+    def _get_str_dictionary(data: Dict[str, Any], key: str) -> Dict[str, Any]:
+        result: Dict[str, Any] = data.get(key, {})
+
+        if not isinstance(result, dict):
+            raise ReportLoadError(f"Incorrect format: {key!r} is not a dictionary")
+
+        return result
+
     @classmethod
     def load(cls, path: Path) -> "Report":
         """
@@ -108,6 +124,9 @@ class Report:
             self.delete_file(PurePath(elem))
         for elem in self._get_list_of_strs(data, "not_deleted"):
             self.not_delete_file(PurePath(elem))
+        self.custom = self._get_str_dictionary(data, "custom")
+        self.encountered_errors = self._get_list_of_strs(data, "encountered_errors")
+        self.encountered_warnings = self._get_list_of_strs(data, "encountered_warnings")
 
         return self
 
@@ -124,6 +143,9 @@ class Report:
             "changed": [str(path) for path in sorted(self.changed_files)],
             "deleted": [str(path) for path in sorted(self.deleted_files)],
             "not_deleted": [str(path) for path in sorted(self.not_deleted_files)],
+            "custom": self.custom,
+            "encountered_warnings": self.encountered_warnings,
+            "encountered_errors": self.encountered_errors,
         }
 
         with open(path, "w") as f:
@@ -190,3 +212,27 @@ class Report:
         """
 
         self.not_deleted_files.add(path)
+
+    def add_custom_value(self, key: str, value: Any) -> None:
+        """
+        Adds a custom value under the passed key, overwriting any existing
+        """
+        self.custom[key] = value
+
+    def get_custom_value(self, key: str) -> Optional[Any]:
+        """
+        Retrieves a custom value for the given key.
+        """
+        return self.custom.get(key)
+
+    def add_error(self, error: str) -> None:
+        """
+        Adds an error to this report's error list.
+        """
+        self.encountered_errors.append(error)
+
+    def add_warning(self, warning: str) -> None:
+        """
+        Adds a warning to this report's warning list.
+        """
+        self.encountered_warnings.append(warning)

PFERD/version.py

@@ -1,2 +1,2 @@
 NAME = "PFERD"
-VERSION = "3.2.0"
+VERSION = "3.3.0"

setup.cfg

@@ -6,11 +6,11 @@ version = attr: PFERD.version.VERSION
 packages = find:
 python_requires = >=3.8
 install_requires =
-  aiohttp>=3.7.4.post0
-  beautifulsoup4>=4.9.3
-  rich>=10.1.0
-  keyring>=23.0.1
-  certifi>=2020.12.5
+  aiohttp>=3.8.1
+  beautifulsoup4>=4.10.0
+  rich>=11.0.0
+  keyring>=23.5.0
+  certifi>=2021.10.8
 
 [options.entry_points]
 console_scripts =