Check for new versions at startup

This downloads all forum posts when needed and saves each thread in its
own html file, named after the thread title.

.github/workflows/build-and-release.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python: ["3.8"]
+        python: ["3.9"]
     steps:
 
       - uses: actions/checkout@v2

CHANGELOG.md

@@ -22,6 +22,83 @@ ambiguous situations.
 
 ## Unreleased
 
+### Fixed
+- Forum crawling crashing when parsing empty (= 0 messages) threads
+- Forum crawling crashing when a forum has no threads at all
+
+## 3.4.1 - 2022-08-17
+
+### Added
+- Download of page descriptions
+- Forum download support
+- `pass` authenticator
+
+### Changed
+- Add `cpp` extension to default `link_regex` of IPD crawler
+- Mention hrefs in IPD crawler's `--explain` output for users of `link_regex` option
+- Simplify default IPD crawler `link_regex`
+
+### Fixed
+- IPD crawler crashes on some sites
+- Meeting name normalization for yesterday, today and tomorrow
+- Crawling of meeting file previews
+- Login with new login button html layout
+- Descriptions for courses are now placed in the correct subfolder when
+  downloading the whole desktop
+
+## 3.4.0 - 2022-05-01
+
+### Added
+- Message when Shibboleth entitlements need to be manually reviewed
+- Links to unofficial packages and repology in the readme
+
+### Changed
+- Increase minimum supported Python version to 3.9
+- Support video listings with more columns
+- Use UTF-8 when reading/writing the config file
+
+### Fixed
+- Crash during authentication when the Shibboleth session is still valid
+
+## 3.3.1 - 2022-01-15
+
+### Fixed
+- ILIAS login
+- Local video cache if `windows_paths` is enabled
+
+## 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
+- `--skip` command line option
+- Support for ILIAS booking objects
+
+### Changed
+- Using multiple path segments on left side of `-name->` now results in an
+  error. This was already forbidden by the documentation but silently accepted
+  by PFERD.
+- More consistent path printing in some `--explain` messages
+
+### Fixed
+- Nondeterministic name deduplication due to ILIAS reordering elements
+- More exceptions are handled properly
+
 ## 3.1.0 - 2021-06-13
 
 If your config file doesn't do weird things with transforms, it should continue

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
+format, see the [configparser documentation][1] ([interpolation][2] is
-enabled).
+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
 
@@ -36,7 +36,7 @@ Sections whose names start with `crawl:` are used to configure crawlers. The
 rest of the section name specifies the name of the crawler.
 
 A crawler synchronizes a remote resource to a local directory. There are
-different types of crawlers for different kinds of resources, e. g. ILIAS
+different types of crawlers for different kinds of resources, e.g. ILIAS
 courses or lecture websites.
 
 Each crawl section represents an instance of a specific type of crawler. The
@@ -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|cpp|java)$`)
+
 ### The `kit-ilias-web` crawler
 
 This crawler crawls the KIT ILIAS instance.
@@ -211,6 +223,23 @@ is stored in the keyring.
 - `keyring_name`: The service name PFERD uses for storing credentials. (Default:
   `PFERD`)
 
+### The `pass` authenticator
+
+This authenticator queries the [`pass` password manager][3] for a username and
+password. It tries to be mostly compatible with [browserpass][4] and
+[passff][5], so see those links for an overview of the format. If PFERD fails
+to load your password, you can use the `--explain` flag to see why.
+
+- `passname`: The name of the password to use (Required)
+- `username_prefixes`: A comma-separated list of username line prefixes
+  (Default: `login,username,user`)
+- `password_prefixes`: A comma-separated list of password line prefixes
+  (Default: `password,pass,secret`)
+
+[3]: <https://www.passwordstore.org/> "Pass: The Standard Unix Password Manager"
+[4]: <https://github.com/browserpass/browserpass-extension#organizing-password-store> "Organizing password store"
+[5]: <https://github.com/passff/passff#multi-line-format> "Multi-line format"
+
 ### The `tfa` authenticator
 
 This authenticator prompts the user on the console for a two-factor
@@ -304,12 +333,12 @@ is a regular expression and `TARGET` an f-string based template. If a path
 matches `SOURCE`, the output path is created using `TARGET` as template.
 `SOURCE` is automatically anchored.
 
-`TARGET` uses Python's [format string syntax][3]. The *n*-th capturing group can
+`TARGET` uses Python's [format string syntax][6]. The *n*-th capturing group can
-be referred to as `{g<n>}` (e. g. `{g3}`). `{g0}` refers to the original path.
+be referred to as `{g<n>}` (e.g. `{g3}`). `{g0}` refers to the original path.
 If capturing group *n*'s contents are a valid integer, the integer value is
-available as `{i<n>}` (e. g. `{i3}`). If capturing group *n*'s contents are a
+available as `{i<n>}` (e.g. `{i3}`). If capturing group *n*'s contents are a
-valid float, the float value is available as `{f<n>}` (e. g. `{f3}`). If a
+valid float, the float value is available as `{f<n>}` (e.g. `{f3}`). If a
-capturing group is not present (e. g. when matching the string `cd` with the
+capturing group is not present (e.g. when matching the string `cd` with the
 regex `(ab)?cd`), the corresponding variables are not defined.
 
 Python's format string syntax has rich options for formatting its arguments. For
@@ -325,7 +354,7 @@ Example: `f(oo+)/be?ar -re-> B{g1.upper()}H/fear`
 - Converts `fooooo/bear` into `BOOOOOH/fear`
 - Converts `foo/bar/baz` into `BOOH/fear/baz`
 
-[3]: <https://docs.python.org/3/library/string.html#format-string-syntax> "Format String Syntax"
+[6]: <https://docs.python.org/3/library/string.html#format-string-syntax> "Format String Syntax"
 
 ### The `-name-re->` arrow
 

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

@@ -5,6 +5,8 @@ import os
 import sys
 from pathlib import Path
 
+from PFERD.update import check_for_updates
+
 from .auth import AuthLoadError
 from .cli import PARSER, ParserLoadError, load_default_section
 from .config import Config, ConfigDumpError, ConfigLoadError, ConfigOptionError
@@ -15,7 +17,7 @@ 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")
@@ -116,7 +118,7 @@ def main() -> None:
         sys.exit()
 
     try:
-        pferd = Pferd(config, args.crawler)
+        pferd = Pferd(config, args.crawler, args.skip)
     except PferdLoadError as e:
         log.unlock()
         log.error(str(e))
@@ -134,6 +136,11 @@ def main() -> None:
             loop.run_until_complete(asyncio.sleep(1))
             loop.close()
         else:
+            log.explain_topic("Checking for updates")
+            if not args.skip_update_check:
+                asyncio.run(check_for_updates())
+            else:
+                log.explain("Update check skipped due to configuration option")
             asyncio.run(pferd.run(args.debug_transforms))
     except (ConfigOptionError, AuthLoadError) as e:
         log.unlock()
@@ -159,3 +166,7 @@ def main() -> None:
         sys.exit(1)
     else:
         pferd.print_report()
+
+
+if __name__ == "__main__":
+    main()

PFERD/auth/__init__.py

@@ -5,6 +5,7 @@ from ..config import Config
 from .authenticator import Authenticator, AuthError, AuthLoadError, AuthSection  # noqa: F401
 from .credential_file import CredentialFileAuthenticator, CredentialFileAuthSection
 from .keyring import KeyringAuthenticator, KeyringAuthSection
+from .pass_ import PassAuthenticator, PassAuthSection
 from .simple import SimpleAuthenticator, SimpleAuthSection
 from .tfa import TfaAuthenticator
 
@@ -19,6 +20,8 @@ AUTHENTICATORS: Dict[str, AuthConstructor] = {
         CredentialFileAuthenticator(n, CredentialFileAuthSection(s), c),
     "keyring": lambda n, s, c:
         KeyringAuthenticator(n, KeyringAuthSection(s)),
+    "pass": lambda n, s, c:
+        PassAuthenticator(n, PassAuthSection(s)),
     "simple": lambda n, s, c:
         SimpleAuthenticator(n, SimpleAuthSection(s)),
     "tfa": lambda n, s, c:

PFERD/auth/credential_file.py

@@ -20,8 +20,10 @@ class CredentialFileAuthenticator(Authenticator):
 
         path = config.default_section.working_dir() / section.path()
         try:
-            with open(path) as f:
+            with open(path, encoding="utf-8") as f:
                 lines = list(f)
+        except UnicodeDecodeError:
+            raise AuthLoadError(f"Credential file at {fmt_real_path(path)} is not encoded using UTF-8")
         except OSError as e:
             raise AuthLoadError(f"No credential file at {fmt_real_path(path)}") from e
 

PFERD/auth/pass_.py

@@ -0,0 +1,98 @@
+import re
+import subprocess
+from typing import List, Tuple
+
+from ..logging import log
+from .authenticator import Authenticator, AuthError, AuthSection
+
+
+class PassAuthSection(AuthSection):
+    def passname(self) -> str:
+        if (value := self.s.get("passname")) is None:
+            self.missing_value("passname")
+        return value
+
+    def username_prefixes(self) -> List[str]:
+        value = self.s.get("username_prefixes", "login,username,user")
+        return [prefix.lower() for prefix in value.split(",")]
+
+    def password_prefixes(self) -> List[str]:
+        value = self.s.get("password_prefixes", "password,pass,secret")
+        return [prefix.lower() for prefix in value.split(",")]
+
+
+class PassAuthenticator(Authenticator):
+    PREFIXED_LINE_RE = r"([a-zA-Z]+):\s?(.*)"  # to be used with fullmatch
+
+    def __init__(self, name: str, section: PassAuthSection) -> None:
+        super().__init__(name)
+
+        self._passname = section.passname()
+        self._username_prefixes = section.username_prefixes()
+        self._password_prefixes = section.password_prefixes()
+
+    async def credentials(self) -> Tuple[str, str]:
+        log.explain_topic("Obtaining credentials from pass")
+
+        try:
+            log.explain(f"Calling 'pass show {self._passname}'")
+            result = subprocess.check_output(["pass", "show", self._passname], text=True)
+        except subprocess.CalledProcessError as e:
+            raise AuthError(f"Failed to get password info from {self._passname}: {e}")
+
+        prefixed = {}
+        unprefixed = []
+        for line in result.strip().splitlines():
+            if match := re.fullmatch(self.PREFIXED_LINE_RE, line):
+                prefix = match.group(1).lower()
+                value = match.group(2)
+                log.explain(f"Found prefixed line {line!r} with prefix {prefix!r}, value {value!r}")
+                if prefix in prefixed:
+                    raise AuthError(f"Prefix {prefix} specified multiple times")
+                prefixed[prefix] = value
+            else:
+                log.explain(f"Found unprefixed line {line!r}")
+                unprefixed.append(line)
+
+        username = None
+        for prefix in self._username_prefixes:
+            log.explain(f"Looking for username at prefix {prefix!r}")
+            if prefix in prefixed:
+                username = prefixed[prefix]
+                log.explain(f"Found username {username!r}")
+                break
+
+        password = None
+        for prefix in self._password_prefixes:
+            log.explain(f"Looking for password at prefix {prefix!r}")
+            if prefix in prefixed:
+                password = prefixed[prefix]
+                log.explain(f"Found password {password!r}")
+                break
+
+        if password is None and username is None:
+            log.explain("No username and password found so far")
+            log.explain("Using first unprefixed line as password")
+            log.explain("Using second unprefixed line as username")
+        elif password is None:
+            log.explain("No password found so far")
+            log.explain("Using first unprefixed line as password")
+        elif username is None:
+            log.explain("No username found so far")
+            log.explain("Using first unprefixed line as username")
+
+        if password is None:
+            if not unprefixed:
+                log.explain("Not enough unprefixed lines left")
+                raise AuthError("Password could not be determined")
+            password = unprefixed.pop(0)
+            log.explain(f"Found password {password!r}")
+
+        if username is None:
+            if not unprefixed:
+                log.explain("Not enough unprefixed lines left")
+                raise AuthError("Username could not be determined")
+            username = unprefixed.pop(0)
+            log.explain(f"Found username {username!r}")
+
+        return username, password

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_ilias_web.py

@@ -62,6 +62,11 @@ GROUP.add_argument(
     action=BooleanOptionalAction,
     help="crawl and download videos"
 )
+GROUP.add_argument(
+    "--forums",
+    action=BooleanOptionalAction,
+    help="crawl and download forum posts"
+)
 GROUP.add_argument(
     "--http-timeout", "-t",
     type=float,
@@ -90,6 +95,8 @@ def load(
         section["link_redirect_delay"] = str(args.link_redirect_delay)
     if args.videos is not None:
         section["videos"] = "yes" if args.videos else "no"
+    if args.forums is not None:
+        section["forums"] = "yes" if args.forums else "no"
     if args.http_timeout is not None:
         section["http_timeout"] = str(args.http_timeout)
 

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/cli/parser.py

@@ -151,6 +151,11 @@ PARSER.add_argument(
     action="version",
     version=f"{NAME} {VERSION} (https://github.com/Garmelon/PFERD)",
 )
+PARSER.add_argument(
+    "--skip-update-check",
+    action="store_true",
+    help="disable automatic update checks at startup"
+)
 PARSER.add_argument(
     "--config", "-c",
     type=Path,
@@ -181,6 +186,14 @@ PARSER.add_argument(
     help="only execute a single crawler."
     " Can be specified multiple times to execute multiple crawlers"
 )
+PARSER.add_argument(
+    "--skip", "-S",
+    action="append",
+    type=str,
+    metavar="NAME",
+    help="don't execute this particular crawler."
+    " Can be specified multiple times to skip multiple crawlers"
+)
 PARSER.add_argument(
     "--working-dir",
     type=Path,

PFERD/config.py

@@ -120,7 +120,7 @@ class Config:
         # Using config.read_file instead of config.read because config.read
         # would just ignore a missing file and carry on.
         try:
-            with open(path) as f:
+            with open(path, encoding="utf-8") as f:
                 parser.read_file(f, source=str(path))
         except FileNotFoundError:
             raise ConfigLoadError(path, "File does not exist")
@@ -128,6 +128,8 @@ class Config:
             raise ConfigLoadError(path, "That's a directory, not a file")
         except PermissionError:
             raise ConfigLoadError(path, "Insufficient permissions")
+        except UnicodeDecodeError:
+            raise ConfigLoadError(path, "File is not encoded using UTF-8")
 
     def dump(self, path: Optional[Path] = None) -> None:
         """
@@ -154,12 +156,12 @@ class Config:
             try:
                 # x = open for exclusive creation, failing if the file already
                 # exists
-                with open(path, "x") as f:
+                with open(path, "x", encoding="utf-8") as f:
                     self._parser.write(f)
             except FileExistsError:
                 print("That file already exists.")
                 if asyncio.run(prompt_yes_no("Overwrite it?", default=False)):
-                    with open(path, "w") as f:
+                    with open(path, "w", encoding="utf-8") as f:
                         self._parser.write(f)
                 else:
                     raise ConfigDumpError(path, "File already exists")

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

@@ -1,9 +1,10 @@
 import asyncio
 import os
 from abc import ABC, abstractmethod
+from collections.abc import Awaitable, Coroutine
 from datetime import datetime
 from pathlib import Path, PurePath
-from typing import Any, Awaitable, Callable, Dict, List, Optional, Sequence, Set, Tuple, TypeVar
+from typing import Any, Callable, Dict, List, Optional, Sequence, Set, Tuple, TypeVar
 
 from ..auth import Authenticator
 from ..config import Config, Section
@@ -47,16 +48,18 @@ 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
 
 
-AWrapped = TypeVar("AWrapped", bound=Callable[..., Awaitable[None]])
+AWrapped = TypeVar("AWrapped", bound=Callable[..., Coroutine[Any, Any, Optional[Any]]])
 
 
 def anoncritical(f: AWrapped) -> AWrapped:
@@ -72,21 +75,25 @@ def anoncritical(f: AWrapped) -> AWrapped:
     Warning: Must only be applied to member functions of the Crawler class!
     """
 
-    async def wrapper(*args: Any, **kwargs: Any) -> None:
+    async def wrapper(*args: Any, **kwargs: Any) -> Optional[Any]:
         if not (args and isinstance(args[0], Crawler)):
             raise RuntimeError("@anoncritical must only applied to Crawler methods")
 
         crawler = args[0]
 
         try:
-            await f(*args, **kwargs)
+            return await f(*args, **kwargs)
         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
+
     return wrapper  # type: ignore
 
 
@@ -318,6 +325,7 @@ class Crawler(ABC):
             log.explain("Warnings or errors occurred during this run")
             log.explain("Answer: No")
 
+    @anoncritical
     async def run(self) -> None:
         """
         Start the crawling process. Call this function if you want to use a

PFERD/crawl/http_crawler.py

@@ -108,7 +108,7 @@ class HttpCrawler(Crawler):
 
     def _load_cookies_from_file(self, path: Path) -> None:
         jar: Any = http.cookies.SimpleCookie()
-        with open(path) as f:
+        with open(path, encoding="utf-8") as f:
             for i, line in enumerate(f):
                 # Names of headers are case insensitive
                 if line[:11].lower() == "set-cookie:":
@@ -121,7 +121,7 @@ class HttpCrawler(Crawler):
         jar: Any = http.cookies.SimpleCookie()
         for morsel in self._cookie_jar:
             jar[morsel.key] = morsel
-        with open(path, "w") as f:
+        with open(path, "w", encoding="utf-8") as f:
             f.write(jar.output(sep="\n"))
             f.write("\n")  # A trailing newline is just common courtesy
 

PFERD/crawl/ilias/ilias_html_cleaner.py

@@ -0,0 +1,91 @@
+from bs4 import BeautifulSoup, Comment, Tag
+
+_STYLE_TAG_CONTENT = """
+    .ilc_text_block_Information {
+      background-color: #f5f7fa;
+    }
+    div.ilc_text_block_Standard {
+      margin-bottom: 10px;
+      margin-top: 10px;
+    }
+    span.ilc_text_inline_Strong {
+      font-weight: bold;
+    }
+
+    .accordion-head {
+      background-color: #f5f7fa;
+      padding: 0.5rem 0;
+    }
+
+    h3 {
+      margin-top: 0.5rem;
+      margin-bottom: 1rem;
+    }
+
+    br.visible-break {
+      margin-bottom: 1rem;
+    }
+
+    article {
+      margin: 0.5rem 0;
+    }
+
+    body {
+      padding: 1em;
+      grid-template-columns: 1fr min(60rem, 90%) 1fr;
+      line-height: 1.2;
+    }
+"""
+
+_ARTICLE_WORTHY_CLASSES = [
+    "ilc_text_block_Information",
+    "ilc_section_Attention",
+    "ilc_section_Link",
+]
+
+
+def insert_base_markup(soup: BeautifulSoup) -> BeautifulSoup:
+    head = soup.new_tag("head")
+    soup.insert(0, head)
+
+    simplecss_link: Tag = soup.new_tag("link")
+    # <link rel="stylesheet" href="https://cdn.simplecss.org/simple.css">
+    simplecss_link["rel"] = "stylesheet"
+    simplecss_link["href"] = "https://cdn.simplecss.org/simple.css"
+    head.append(simplecss_link)
+
+    # Basic style tags for compat
+    style: Tag = soup.new_tag("style")
+    style.append(_STYLE_TAG_CONTENT)
+    head.append(style)
+
+    return soup
+
+
+def clean(soup: BeautifulSoup) -> BeautifulSoup:
+    for block in soup.find_all(class_=lambda x: x in _ARTICLE_WORTHY_CLASSES):
+        block.name = "article"
+
+    for block in soup.find_all("h3"):
+        block.name = "div"
+
+    for block in soup.find_all("h1"):
+        block.name = "h3"
+
+    for block in soup.find_all(class_="ilc_va_ihcap_VAccordIHeadCap"):
+        block.name = "h3"
+        block["class"] += ["accordion-head"]
+
+    for dummy in soup.select(".ilc_text_block_Standard.ilc_Paragraph"):
+        children = list(dummy.children)
+        if not children:
+            dummy.decompose()
+        if len(children) > 1:
+            continue
+        if type(children[0]) == Comment:
+            dummy.decompose()
+
+    for hrule_imposter in soup.find_all(class_="ilc_section_Separator"):
+        hrule_imposter.insert(0, soup.new_tag("hr"))
+
+    return soup

PFERD/crawl/ilias/kit_ilias_html.py

@@ -3,7 +3,7 @@ import re
 from dataclasses import dataclass
 from datetime import date, datetime, timedelta
 from enum import Enum
-from typing import List, Optional, Union
+from typing import Dict, List, Optional, Union
 from urllib.parse import urljoin, urlparse
 
 from bs4 import BeautifulSoup, Tag
@@ -22,6 +22,7 @@ class IliasElementType(Enum):
     FOLDER = "folder"
     FORUM = "forum"
     LINK = "link"
+    BOOKING = "booking"
     MEETING = "meeting"
     VIDEO = "video"
     VIDEO_PLAYER = "video_player"
@@ -37,6 +38,37 @@ class IliasPageElement:
     mtime: Optional[datetime] = None
     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+)",
+            r"target=[a-z]+_(?P<id>\d+)"
+        ]
+
+        for regex in regexes:
+            if match := re.search(regex, self.url):
+                return match.groupdict()["id"]
+
+        # Fall back to URL
+        log.warn(f"Didn't find identity for {self.name} - {self.url}. Please report this.")
+        return self.url
+
+
+@dataclass
+class IliasDownloadForumData:
+    url: str
+    form_data: Dict[str, Union[str, List[str]]]
+    empty: bool
+
+
+@dataclass
+class IliasForumThread:
+    title: str
+    title_tag: Tag
+    content_tag: Tag
+    mtime: Optional[datetime]
+
 
 class IliasPage:
 
@@ -59,16 +91,81 @@ 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()
 
+    def get_description(self) -> Optional[BeautifulSoup]:
+        def is_interesting_class(name: str) -> bool:
+            return name in ["ilCOPageSection", "ilc_Paragraph", "ilc_va_ihcap_VAccordIHeadCap"]
+
+        paragraphs: List[Tag] = self._soup.findAll(class_=is_interesting_class)
+        if not paragraphs:
+            return None
+
+        # Extract bits and pieces into a string and parse it again.
+        # This ensures we don't miss anything and weird structures are resolved
+        # somewhat gracefully.
+        raw_html = ""
+        for p in paragraphs:
+            if p.find_parent(class_=is_interesting_class):
+                continue
+
+            # Ignore special listings (like folder groupings)
+            if "ilc_section_Special" in p["class"]:
+                continue
+
+            raw_html += str(p) + "\n"
+        raw_html = f"<body>\n{raw_html}\n</body>"
+
+        return BeautifulSoup(raw_html, "html.parser")
+
+    def get_download_forum_data(self) -> Optional[IliasDownloadForumData]:
+        form = self._soup.find("form", attrs={"action": lambda x: x and "fallbackCmd=showThreads" in x})
+        if not form:
+            return None
+        post_url = self._abs_url_from_relative(form["action"])
+
+        thread_ids = [f["value"] for f in form.find_all(attrs={"name": "thread_ids[]"})]
+
+        form_data: Dict[str, Union[str, List[ſtr]]] = {
+            "thread_ids[]": thread_ids,
+            "selected_cmd2": "html",
+            "select_cmd2": "Ausführen",
+            "selected_cmd": "",
+        }
+
+        return IliasDownloadForumData(url=post_url, form_data=form_data, empty=len(thread_ids) == 0)
+
     def get_next_stage_element(self) -> Optional[IliasPageElement]:
+        if self._is_forum_page():
+            if "trows=800" in self._page_url:
+                return None
+            log.explain("Requesting *all* forum threads")
+            return self._get_show_max_forum_entries_per_page_url()
         if self._is_ilias_opencast_embedding():
+            log.explain("Unwrapping opencast embedding")
             return self.get_child_elements()[0]
         if self._page_type == IliasElementType.VIDEO_FOLDER_MAYBE_PAGINATED:
+            log.explain("Unwrapping video pagination")
             return self._find_video_entries_paginated()[0]
+        if self._contains_collapsed_future_meetings():
+            log.explain("Requesting *all* future meetings")
+            return self._uncollapse_future_meetings_url()
         return None
 
+    def _is_forum_page(self) -> bool:
+        read_more_btn = self._soup.find(
+            "button",
+            attrs={"onclick": lambda x: x and "cmdClass=ilobjforumgui&cmd=markAllRead" in x}
+        )
+        return read_more_btn is not None
+
     def _is_video_player(self) -> bool:
         return "paella_config_file" in str(self._soup)
 
@@ -103,13 +200,32 @@ 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 _contains_collapsed_future_meetings(self) -> bool:
+        return self._uncollapse_future_meetings_url() is not None
+
+    def _uncollapse_future_meetings_url(self) -> Optional[IliasPageElement]:
+        element = self._soup.find("a", attrs={"href": lambda x: x and "crs_next_sess=1" in x})
+        if not element:
+            return None
+        link = self._abs_url_from_link(element)
+        return IliasPageElement(IliasElementType.FOLDER, link, "show all meetings")
+
     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))
@@ -121,9 +237,76 @@ class IliasPage:
 
         # parse it
         json_object = json.loads(json_str)
-        # and fetch the video url!
+        streams = [stream for stream in json_object["streams"]]
-        video_url = json_object["streams"][0]["sources"]["mp4"][0]["src"]
+
-        return [IliasPageElement(IliasElementType.VIDEO, video_url, self._source_name)]
+        # 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 _get_show_max_forum_entries_per_page_url(self) -> Optional[IliasPageElement]:
+        correct_link = self._soup.find(
+            "a",
+            attrs={"href": lambda x: x and "trows=800" in x and "cmd=showThreads" in x}
+        )
+
+        if not correct_link:
+            return None
+
+        link = self._abs_url_from_link(correct_link)
+
+        return IliasPageElement(IliasElementType.FORUM, link, "show all forum threads")
+
+    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
@@ -194,11 +377,22 @@ class IliasPage:
 
     def _listed_video_to_element(self, link: Tag) -> IliasPageElement:
         # The link is part of a table with multiple columns, describing metadata.
-        # 6th child (1 indexed) is the modification time string
+        # 6th or 7th child (1 indexed) is the modification time string. Try to find it
-        modification_string = link.parent.parent.parent.select_one(
+        # by parsing backwards from the end and finding something that looks like a date
-            "td.std:nth-child(6)"
+        modification_time = None
-        ).getText().strip()
+        row: Tag = link.parent.parent.parent
-        modification_time = datetime.strptime(modification_string, "%d.%m.%Y - %H:%M")
+        column_count = len(row.select("td.std"))
+        for index in range(column_count, 0, -1):
+            modification_string = link.parent.parent.parent.select_one(
+                f"td.std:nth-child({index})"
+            ).getText().strip()
+            if re.search(r"\d+\.\d+.\d+ - \d+:\d+", modification_string):
+                modification_time = datetime.strptime(modification_string, "%d.%m.%Y - %H:%M")
+                break
+
+        if modification_time is None:
+            log.warn(f"Could not determine upload time for {link}")
+            modification_time = datetime.now()
 
         title = link.parent.parent.parent.select_one("td.std:nth-child(3)").getText().strip()
         title += ".mp4"
@@ -331,6 +525,12 @@ class IliasPage:
             element_type = self._find_type_from_link(element_name, link, abs_url)
             description = self._find_link_description(link)
 
+            # The last meeting on every page is expanded by default.
+            # Its content is then shown inline *and* in the meeting page itself.
+            # We should skip the inline content.
+            if element_type != IliasElementType.MEETING and self._is_in_expanded_meeting(link):
+                continue
+
             if not element_type:
                 continue
             if element_type == IliasElementType.MEETING:
@@ -344,8 +544,30 @@ 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 _is_in_expanded_meeting(self, tag: Tag) -> bool:
+        """
+        Returns whether a file is part of an expanded meeting.
+        Has false positives for meetings themselves as their title is also "in the expanded meeting content".
+        It is in the same general div and this whole thing is guesswork.
+        Therefore, you should check for meetings before passing them in this function.
+        """
+        parents: List[Tag] = list(tag.parents)
+        for parent in parents:
+            if not parent.get("class"):
+                continue
+
+            # We should not crawl files under meetings
+            if "ilContainerListItemContentCB" in parent.get("class"):
+                link: Tag = parent.parent.find("a")
+                type = IliasPage._find_type_from_folder_like(link, self._page_url)
+                return type == IliasElementType.MEETING
+
+        return False
+
     def _find_upwards_folder_hierarchy(self, tag: Tag) -> List[str]:
         """
         Interprets accordions and expandable blocks as virtual folders and returns them
@@ -371,7 +593,10 @@ class IliasPage:
                     continue
                 prev: Tag = parent.findPreviousSibling("div")
                 if "ilContainerBlockHeader" in prev.get("class"):
-                    found_titles.append(prev.find("h3").getText().strip())
+                    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"):
@@ -426,6 +651,90 @@ 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,
@@ -441,9 +750,30 @@ 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()
@@ -464,7 +794,7 @@ 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
 
@@ -476,6 +806,13 @@ 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 and found_parent.find("a", attrs={"href": lambda x: x and "crs_next_sess=" in x}):
+            log.explain("Found session expansion button, skipping it as it has no content")
+            return None
+
         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}")
@@ -490,6 +827,9 @@ class IliasPage:
         if str(img_tag["src"]).endswith("icon_webr.svg"):
             return IliasElementType.LINK
 
+        if str(img_tag["src"]).endswith("icon_book.svg"):
+            return IliasElementType.BOOKING
+
         if str(img_tag["src"]).endswith("frm.svg"):
             return IliasElementType.FORUM
 
@@ -507,23 +847,38 @@ class IliasPage:
         Normalizes meeting names, which have a relative time as their first part,
         to their date in ISO format.
         """
-        date_portion_str = meeting_name.split(" - ")[0]
+
+        # This checks whether we can reach a `:` without passing a `-`
+        if re.search(r"^[^-]+: ", meeting_name):
+            # Meeting name only contains date: "05. Jan 2000:"
+            split_delimiter = ":"
+        else:
+            # Meeting name contains date and start/end times: "05. Jan 2000, 16:00 - 17:30:"
+            split_delimiter = ", "
+
+        # We have a meeting day without time
+        date_portion_str = meeting_name.split(split_delimiter)[0]
         date_portion = demangle_date(date_portion_str)
 
+        # We failed to parse the date, bail out
         if not date_portion:
             return meeting_name
 
-        rest_of_name = meeting_name
+        # Replace the first section with the absolute date
-        if rest_of_name.startswith(date_portion_str):
+        rest_of_name = split_delimiter.join(meeting_name.split(split_delimiter)[1:])
-            rest_of_name = rest_of_name[len(date_portion_str):]
+        return datetime.strftime(date_portion, "%Y-%m-%d") + split_delimiter + rest_of_name
-
-        return datetime.strftime(date_portion, "%Y-%m-%d, %H:%M") + rest_of_name
 
     def _abs_url_from_link(self, link_tag: Tag) -> str:
         """
         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:
@@ -536,35 +891,47 @@ english_months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
 
 def demangle_date(date_str: str, fail_silently: bool = False) -> Optional[datetime]:
     """
-    Demangle a given date in one of the following formats:
+    Demangle a given date in one of the following formats (hour/minute part is optional):
     "Gestern, HH:MM"
     "Heute, HH:MM"
     "Morgen, HH:MM"
     "dd. mon yyyy, HH:MM
     """
     try:
+        # Normalize whitespace because users
         date_str = re.sub(r"\s+", " ", date_str)
+
         date_str = re.sub("Gestern|Yesterday", _format_date_english(_yesterday()), date_str, re.I)
         date_str = re.sub("Heute|Today", _format_date_english(date.today()), date_str, re.I)
         date_str = re.sub("Morgen|Tomorrow",  _format_date_english(_tomorrow()), date_str, re.I)
+        date_str = date_str.strip()
         for german, english in zip(german_months, english_months):
             date_str = date_str.replace(german, english)
             # Remove trailing dots for abbreviations, e.g. "20. Apr. 2020" -> "20. Apr 2020"
             date_str = date_str.replace(english + ".", english)
 
-        # We now have a nice english String in the format: "dd. mmm yyyy, hh:mm"
+        # We now have a nice english String in the format: "dd. mmm yyyy, hh:mm" or "dd. mmm yyyy"
-        day_part, time_part = date_str.split(",")
+
+        # Check if we have a time as well
+        if ", " in date_str:
+            day_part, time_part = date_str.split(",")
+        else:
+            day_part = date_str.split(",")[0]
+            time_part = None
+
         day_str, month_str, year_str = day_part.split(" ")
 
         day = int(day_str.strip().replace(".", ""))
         month = english_months.index(month_str.strip()) + 1
         year = int(year_str.strip())
 
-        hour_str, minute_str = time_part.split(":")
+        if time_part:
-        hour = int(hour_str)
+            hour_str, minute_str = time_part.split(":")
-        minute = int(minute_str)
+            hour = int(hour_str)
+            minute = int(minute_str)
+            return datetime(year, month, day, hour, minute)
 
-        return datetime(year, month, day, hour, minute)
+        return datetime(year, month, day)
     except Exception:
         if not fail_silently:
             log.warn(f"Date parsing failed for {date_str!r}")
@@ -586,3 +953,45 @@ def _tomorrow() -> date:
 
 def _sanitize_path_name(name: str) -> str:
     return name.replace("/", "-").replace("\\", "-").strip()
+
+
+def parse_ilias_forum_export(forum_export: BeautifulSoup) -> List[IliasForumThread]:
+    elements = []
+    for p in forum_export.select("body > p"):
+        title_tag = p
+        content_tag = p.find_next_sibling("ul")
+
+        if not content_tag:
+            # ILIAS allows users to delete the initial post while keeping the thread open
+            # This produces empty threads without *any* content.
+            # I am not sure why you would want this, but ILIAS makes it easy to do.
+            continue
+
+        title = p.find("b").text
+        if ":" in title:
+            title = title[title.find(":") + 1:]
+        title = title.strip()
+        mtime = _guess_timestamp_from_forum_post_content(content_tag)
+        elements.append(IliasForumThread(title, title_tag, content_tag, mtime))
+
+    return elements
+
+
+def _guess_timestamp_from_forum_post_content(content: Tag) -> Optional[datetime]:
+    posts: Optional[Tag] = content.select(".ilFrmPostHeader > span.small")
+    if not posts:
+        return None
+
+    newest_date: Optional[datetime] = None
+
+    for post in posts:
+        text = post.text.strip()
+        text = text[text.rfind("|") + 1:]
+        date = demangle_date(text, fail_silently=True)
+        if not date:
+            continue
+
+        if not newest_date or newest_date < date:
+            newest_date = date
+
+    return newest_date

PFERD/crawl/ilias/kit_ilias_web_crawler.py

@@ -1,9 +1,11 @@
 import asyncio
 import re
+from collections.abc import Awaitable, Coroutine
 from pathlib import PurePath
-from typing import Any, Awaitable, Callable, Dict, List, Optional, Set, TypeVar, Union
+from typing import Any, Callable, Dict, List, Optional, Set, Union, cast
 
 import aiohttp
+import yarl
 from aiohttp import hdrs
 from bs4 import BeautifulSoup, Tag
 
@@ -12,13 +14,21 @@ from ...config import Config
 from ...logging import ProgressBar, log
 from ...output_dir import FileSink, Redownload
 from ...utils import fmt_path, soupify, url_set_query_param
-from ..crawler import CrawlError, CrawlWarning, anoncritical
+from ..crawler import AWrapped, CrawlError, CrawlToken, CrawlWarning, DownloadToken, anoncritical
 from ..http_crawler import HttpCrawler, HttpCrawlerSection
 from .file_templates import Links
-from .kit_ilias_html import IliasElementType, IliasPage, IliasPageElement
+from .ilias_html_cleaner import clean, insert_base_markup
+from .kit_ilias_html import (IliasElementType, IliasForumThread, IliasPage, IliasPageElement,
+                             _sanitize_path_name, parse_ilias_forum_export)
 
 TargetType = Union[str, int]
 
+_ILIAS_URL = "https://ilias.studium.kit.edu"
+
+
+class KitShibbolethBackgroundLoginSuccessful():
+    pass
+
 
 class KitIliasWebCrawlerSection(HttpCrawlerSection):
     def target(self) -> TargetType:
@@ -32,7 +42,7 @@ class KitIliasWebCrawlerSection(HttpCrawlerSection):
         if target == "desktop":
             # Full personal desktop
             return target
-        if target.startswith("https://ilias.studium.kit.edu"):
+        if target.startswith(_ILIAS_URL):
             # ILIAS URL
             return target
 
@@ -64,6 +74,9 @@ class KitIliasWebCrawlerSection(HttpCrawlerSection):
     def videos(self) -> bool:
         return self.s.getboolean("videos", fallback=False)
 
+    def forums(self) -> bool:
+        return self.s.getboolean("forums", fallback=False)
+
 
 _DIRECTORY_PAGES: Set[IliasElementType] = set([
     IliasElementType.EXERCISE,
@@ -81,17 +94,14 @@ _VIDEO_ELEMENTS: Set[IliasElementType] = set([
     IliasElementType.VIDEO_FOLDER_MAYBE_PAGINATED,
 ])
 
-AWrapped = TypeVar("AWrapped", bound=Callable[..., Awaitable[None]])
 
-
+def _iorepeat(attempts: int, name: str, failure_is_error: bool = False) -> Callable[[AWrapped], AWrapped]:
-def _iorepeat(attempts: int, name: str) -> Callable[[AWrapped], AWrapped]:
     def decorator(f: AWrapped) -> AWrapped:
-        async def wrapper(*args: Any, **kwargs: Any) -> None:
+        async def wrapper(*args: Any, **kwargs: Any) -> Optional[Any]:
             last_exception: Optional[BaseException] = None
             for round in range(attempts):
                 try:
-                    await f(*args, **kwargs)
+                    return await f(*args, **kwargs)
-                    return
                 except aiohttp.ContentTypeError:  # invalid content type
                     raise CrawlWarning("ILIAS returned an invalid content type")
                 except aiohttp.TooManyRedirects:
@@ -106,7 +116,10 @@ def _iorepeat(attempts: int, name: str) -> Callable[[AWrapped], AWrapped]:
 
             if last_exception:
                 message = f"Error in I/O Operation: {last_exception}"
-                raise CrawlWarning(message) from 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")
 
         return wrapper  # type: ignore
@@ -174,12 +187,14 @@ instance's greatest bottleneck.
             section.tfa_auth(authenticators),
         )
 
-        self._base_url = "https://ilias.studium.kit.edu"
+        self._base_url = _ILIAS_URL
 
         self._target = section.target()
         self._link_file_redirect_delay = section.link_redirect_delay()
         self._links = section.links()
         self._videos = section.videos()
+        self._forums = section.forums()
+        self._visited_urls: Set[str] = set()
 
     async def _run(self) -> None:
         if isinstance(self._target, int):
@@ -201,7 +216,9 @@ 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("."))
@@ -210,38 +227,75 @@ instance's greatest bottleneck.
         cl = maybe_cl  # Not mypy's fault, but explained here: https://github.com/python/mypy/issues/2608
 
         elements: List[IliasPageElement] = []
+        # A list as variable redefinitions are not propagated to outer scopes
+        description: List[BeautifulSoup] = []
 
         @_iorepeat(3, "crawling url")
         async def gather_elements() -> None:
             elements.clear()
             async with cl:
-                soup = await self._get_page(url)
+                next_stage_url: Optional[str] = url
-
+                current_parent = None
-                if expected_id is not None:
-                    perma_link_element: Tag = soup.find(id="current_perma_link")
-                    if not perma_link_element or "crs_" not in perma_link_element.get("value"):
-                        raise CrawlError("Invalid course id? Didn't find anything looking like a course")
 
                 # Duplicated code, but the root page is special - we want to avoid fetching it twice!
-                log.explain_topic("Parsing root HTML page")
+                while next_stage_url:
-                log.explain(f"URL: {url}")
+                    soup = await self._get_page(next_stage_url)
-                page = IliasPage(soup, url, None)
+
+                    if current_parent is None and expected_id is not None:
+                        perma_link_element: Tag = soup.find(id="current_perma_link")
+                        if not perma_link_element or "crs_" not in perma_link_element.get("value"):
+                            raise CrawlError("Invalid course id? Didn't find anything looking like a course")
+
+                    log.explain_topic(f"Parsing HTML page for {fmt_path(cl.path)}")
+                    log.explain(f"URL: {next_stage_url}")
+                    page = IliasPage(soup, next_stage_url, current_parent)
+                    if next_element := page.get_next_stage_element():
+                        current_parent = next_element
+                        next_stage_url = next_element.url
+                    else:
+                        next_stage_url = None
+
                 elements.extend(page.get_child_elements())
+                if description_string := page.get_description():
+                    description.append(description_string)
 
         # Fill up our task list with the found elements
         await gather_elements()
-        tasks = [self._handle_ilias_element(PurePath("."), element) for element in elements]
+
+        if description:
+            await self._download_description(PurePath("."), description[0])
+
+        elements.sort(key=lambda e: e.id())
+
+        tasks: List[Awaitable[None]] = []
+        for element in elements:
+            if handle := await self._handle_ilias_element(PurePath("."), element):
+                tasks.append(asyncio.create_task(handle))
 
         # And execute them
         await self.gather(tasks)
 
-    async def _handle_ilias_page(self, url: str, parent: IliasPageElement, path: PurePath) -> None:
+    async def _handle_ilias_page(
+        self,
+        url: str,
+        parent: IliasPageElement,
+        path: PurePath,
+    ) -> Optional[Coroutine[Any, Any, None]]:
         maybe_cl = await self.crawl(path)
         if not maybe_cl:
-            return
+            return None
-        cl = maybe_cl  # Not mypy's fault, but explained here: https://github.com/python/mypy/issues/2608
+        return self._crawl_ilias_page(url, parent, maybe_cl)
 
+    @anoncritical
+    async def _crawl_ilias_page(
+        self,
+        url: str,
+        parent: IliasPageElement,
+        cl: CrawlToken,
+    ) -> None:
         elements: List[IliasPageElement] = []
+        # A list as variable redefinitions are not propagated to outer scopes
+        description: List[BeautifulSoup] = []
 
         @_iorepeat(3, "crawling folder")
         async def gather_elements() -> None:
@@ -252,7 +306,7 @@ instance's greatest bottleneck.
 
                 while next_stage_url:
                     soup = await self._get_page(next_stage_url)
-                    log.explain_topic(f"Parsing HTML page for {fmt_path(path)}")
+                    log.explain_topic(f"Parsing HTML page for {fmt_path(cl.path)}")
                     log.explain(f"URL: {next_stage_url}")
                     page = IliasPage(soup, next_stage_url, current_parent)
                     if next_element := page.get_next_stage_element():
@@ -262,55 +316,91 @@ instance's greatest bottleneck.
                         next_stage_url = None
 
                 elements.extend(page.get_child_elements())
+                if description_string := page.get_description():
+                    description.append(description_string)
 
         # Fill up our task list with the found elements
         await gather_elements()
-        tasks = [self._handle_ilias_element(cl.path, element) for element in elements]
+
+        if description:
+            await self._download_description(cl.path, description[0])
+
+        elements.sort(key=lambda e: e.id())
+
+        tasks: List[Awaitable[None]] = []
+        for element in elements:
+            if handle := await self._handle_ilias_element(cl.path, element):
+                tasks.append(asyncio.create_task(handle))
 
         # 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.
+    async def _handle_ilias_element(
-    # If that happens we will be terminated as anoncritical doesn't tream them as non-critical.
+        self,
-    @_wrap_io_in_warning("handling ilias element")
+        parent_path: PurePath,
-    async def _handle_ilias_element(self, parent_path: PurePath, element: IliasPageElement) -> None:
+        element: IliasPageElement,
+    ) -> Optional[Coroutine[Any, Any, 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:
-            log.explain_topic(f"Decision: Crawl video element {fmt_path(element_path)}")
             if not self._videos:
-                log.explain("Video crawling is disabled")
+                log.status(
-                log.explain("Answer: no")
+                    "[bold bright_black]",
-                return
+                    "Ignored",
-            else:
+                    fmt_path(element_path),
-                log.explain("Video crawling is enabled")
+                    "[bright_black](enable with option 'videos')"
-                log.explain("Answer: yes")
+                )
+                return None
 
         if element.type == IliasElementType.FILE:
-            await self._download_file(element, element_path)
+            return await self._handle_file(element, element_path)
         elif element.type == IliasElementType.FORUM:
-            log.explain_topic(f"Decision: Crawl {fmt_path(element_path)}")
+            if not self._forums:
-            log.explain("Forums are not supported")
+                log.status(
-            log.explain("Answer: No")
+                    "[bold bright_black]",
+                    "Ignored",
+                    fmt_path(element_path),
+                    "[bright_black](enable with option 'forums')"
+                )
+                return None
+            return await self._handle_forum(element, element_path)
         elif element.type == IliasElementType.TEST:
             log.explain_topic(f"Decision: Crawl {fmt_path(element_path)}")
             log.explain("Tests contain no relevant files")
             log.explain("Answer: No")
+            return None
         elif element.type == IliasElementType.LINK:
-            await self._download_link(element, element_path)
+            return await self._handle_link(element, element_path)
+        elif element.type == IliasElementType.BOOKING:
+            return await self._handle_booking(element, element_path)
         elif element.type == IliasElementType.VIDEO:
-            await self._download_file(element, element_path)
+            return await self._handle_file(element, element_path)
         elif element.type == IliasElementType.VIDEO_PLAYER:
-            await self._download_video(element, element_path)
+            return await self._handle_video(element, element_path)
         elif element.type in _DIRECTORY_PAGES:
-            await self._handle_ilias_page(element.url, element, element_path)
+            return await self._handle_ilias_page(element.url, element, element_path)
         else:
             # This will retry it a few times, failing everytime. It doesn't make any network
             # requests, so that's fine.
             raise CrawlWarning(f"Unknown element type: {element.type!r}")
 
-    async def _download_link(self, element: IliasPageElement, element_path: PurePath) -> None:
+    async def _handle_link(
+        self,
+        element: IliasPageElement,
+        element_path: PurePath,
+    ) -> Optional[Coroutine[Any, Any, None]]:
         log.explain_topic(f"Decision: Crawl Link {fmt_path(element_path)}")
         log.explain(f"Links type is {self._links}")
 
@@ -318,32 +408,87 @@ instance's greatest bottleneck.
         link_extension = self._links.extension()
         if not link_template_maybe or not link_extension:
             log.explain("Answer: No")
-            return
+            return None
         else:
             log.explain("Answer: Yes")
-        link_template = link_template_maybe
         element_path = element_path.with_name(element_path.name + link_extension)
 
         maybe_dl = await self.download(element_path, mtime=element.mtime)
         if not maybe_dl:
+            return None
+
+        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):
+            export_url = element.url.replace("cmd=calldirectlink", "cmd=exportHTML")
+            real_url = await self._resolve_link_target(export_url)
+            self._write_link_content(link_template, real_url, element.name, element.description, sink)
+
+    def _write_link_content(
+        self,
+        link_template: str,
+        url: str,
+        name: str,
+        description: Optional[str],
+        sink: FileSink,
+    ) -> None:
+        content = link_template
+        content = content.replace("{{link}}", url)
+        content = content.replace("{{name}}", name)
+        content = content.replace("{{description}}", str(description))
+        content = content.replace("{{redirect_delay}}", str(self._link_file_redirect_delay))
+        sink.file.write(content.encode("utf-8"))
+        sink.done()
+
+    async def _handle_booking(
+        self,
+        element: IliasPageElement,
+        element_path: PurePath,
+    ) -> Optional[Coroutine[Any, Any, None]]:
+        log.explain_topic(f"Decision: Crawl Booking Link {fmt_path(element_path)}")
+        log.explain(f"Links type is {self._links}")
+
+        link_template_maybe = self._links.template()
+        link_extension = self._links.extension()
+        if not link_template_maybe or not link_extension:
+            log.explain("Answer: No")
+            return None
+        else:
+            log.explain("Answer: Yes")
+        element_path = element_path.with_name(element_path.name + link_extension)
+
+        maybe_dl = await self.download(element_path, mtime=element.mtime)
+        if not maybe_dl:
+            return None
+
+        return self._download_booking(element, link_template_maybe, maybe_dl)
+
+    @anoncritical
+    @_iorepeat(1, "downloading description")
+    async def _download_description(self, parent_path: PurePath, description: BeautifulSoup) -> None:
+        path = parent_path / "Description.html"
+        dl = await self.download(path, redownload=Redownload.ALWAYS)
+        if not dl:
             return
-        dl = maybe_dl  # Not mypy's fault, but explained here: https://github.com/python/mypy/issues/2608
 
-        @_iorepeat(3, "resolving link")
+        async with dl as (bar, sink):
-        async def impl() -> None:
+            description = clean(insert_base_markup(description))
-            async with dl as (bar, sink):
+            sink.file.write(description.prettify().encode("utf-8"))
-                export_url = element.url.replace("cmd=calldirectlink", "cmd=exportHTML")
+            sink.done()
-                real_url = await self._resolve_link_target(export_url)
 
-                content = link_template
+    @anoncritical
-                content = content.replace("{{link}}", real_url)
+    @_iorepeat(3, "resolving booking")
-                content = content.replace("{{name}}", element.name)
+    async def _download_booking(
-                content = content.replace("{{description}}", str(element.description))
+        self,
-                content = content.replace("{{redirect_delay}}", str(self._link_file_redirect_delay))
+        element: IliasPageElement,
-                sink.file.write(content.encode("utf-8"))
+        link_template: str,
-                sink.done()
+        dl: DownloadToken,
-
+    ) -> None:
-        await impl()
+        async with dl as (bar, sink):
+            self._write_link_content(link_template, element.url, element.name, element.description, sink)
 
     async def _resolve_link_target(self, export_url: str) -> str:
         async with self.session.get(export_url, allow_redirects=False) as resp:
@@ -351,7 +496,7 @@ instance's greatest bottleneck.
             if hdrs.LOCATION not in resp.headers:
                 return soupify(await resp.read()).select_one("a").get("href").strip()
 
-        self._authenticate()
+        await self._authenticate()
 
         async with self.session.get(export_url, allow_redirects=False) as resp:
             # No redirect means we were authenticated
@@ -360,39 +505,130 @@ instance's greatest bottleneck.
 
         raise CrawlError("resolve_link_target failed even after authenticating")
 
-    async def _download_video(self, element: IliasPageElement, element_path: PurePath) -> None:
+    async def _handle_video(
-        # Videos will NOT be redownloaded - their content doesn't really change and they are chunky
+        self,
-        maybe_dl = await self.download(element_path, mtime=element.mtime, redownload=Redownload.NEVER)
+        element: IliasPageElement,
-        if not maybe_dl:
+        element_path: PurePath,
-            return
+    ) -> Optional[Coroutine[Any, Any, None]]:
-        dl = maybe_dl  # Not mypy's fault, but explained here: https://github.com/python/mypy/issues/2608
+        # 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))
+            )
 
-        @_iorepeat(3, "downloading video")
+        # A video might contain other videos, so let's "crawl" the video first
-        async def impl() -> None:
+        # to ensure rate limits apply. This must be a download as *this token*
-            assert dl  # The function is only reached when dl is not None
+        # is re-used if the video consists of a single stream. In that case the
-            async with dl as (bar, sink):
+        # file name is used and *not* the stream name the ilias html parser reported
-                page = IliasPage(await self._get_page(element.url), element.url, element)
+        # to ensure backwards compatibility.
-                real_element = page.get_child_elements()[0]
+        maybe_dl = await self.download(element_path, mtime=element.mtime, redownload=Redownload.ALWAYS)
 
-                log.explain(f"Streaming video from real url {real_element.url}")
+        # 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)
 
-                await self._stream_from_url(real_element.url, sink, bar, is_video=True)
+            return None
 
-        await impl()
+        return self._download_video(element_path, element, maybe_dl)
 
-    async def _download_file(self, element: IliasPageElement, element_path: PurePath) -> None:
+    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._to_local_video_path(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
+
+    def _to_local_video_path(self, path: PurePath) -> Optional[PurePath]:
+        if transformed := self._transformer.transform(path):
+            return self._deduplicator.fixup_path(transformed)
+        return None
+
+    @anoncritical
+    @_iorepeat(3, "downloading video")
+    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)
+            stream_elements = page.get_child_elements()
+
+            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]
+
+                transformed_path = self._to_local_video_path(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,
+        element: IliasPageElement,
+        element_path: PurePath,
+    ) -> Optional[Coroutine[Any, Any, None]]:
         maybe_dl = await self.download(element_path, mtime=element.mtime)
         if not maybe_dl:
-            return
+            return None
-        dl = maybe_dl  # Not mypy's fault, but explained here: https://github.com/python/mypy/issues/2608
+        return self._download_file(element, maybe_dl)
 
-        @_iorepeat(3, "downloading file")
+    @anoncritical
-        async def impl() -> None:
+    @_iorepeat(3, "downloading file")
-            assert dl  # The function is only reached when dl is not None
+    async def _download_file(self, element: IliasPageElement, dl: DownloadToken) -> None:
-            async with dl as (bar, sink):
+        assert dl  # The function is only reached when dl is not None
-                await self._stream_from_url(element.url, sink, bar, is_video=False)
+        async with dl as (bar, sink):
-
+            await self._stream_from_url(element.url, sink, bar, is_video=False)
-        await impl()
 
     async def _stream_from_url(self, url: str, sink: FileSink, bar: ProgressBar, is_video: bool) -> None:
         async def try_stream() -> bool:
@@ -424,6 +660,72 @@ instance's greatest bottleneck.
         if not await try_stream():
             raise CrawlError("File streaming failed after authenticate()")
 
+    async def _handle_forum(
+        self,
+        element: IliasPageElement,
+        element_path: PurePath,
+    ) -> Optional[Coroutine[Any, Any, None]]:
+        maybe_cl = await self.crawl(element_path)
+        if not maybe_cl:
+            return None
+        return self._crawl_forum(element, maybe_cl)
+
+    @_iorepeat(3, "crawling forum")
+    @anoncritical
+    async def _crawl_forum(self, element: IliasPageElement, cl: CrawlToken) -> None:
+        elements: List[IliasForumThread] = []
+
+        async with cl:
+            next_stage_url = element.url
+            while next_stage_url:
+                log.explain_topic(f"Parsing HTML page for {fmt_path(cl.path)}")
+                log.explain(f"URL: {next_stage_url}")
+
+                soup = await self._get_page(next_stage_url)
+                page = IliasPage(soup, next_stage_url, None)
+
+                if next := page.get_next_stage_element():
+                    next_stage_url = next.url
+                else:
+                    break
+
+            download_data = page.get_download_forum_data()
+            if not download_data:
+                raise CrawlWarning("Failed to extract forum data")
+            if download_data.empty:
+                log.explain("Forum had no threads")
+                elements = []
+                return
+            html = await self._post_authenticated(download_data.url, download_data.form_data)
+            elements = parse_ilias_forum_export(soupify(html))
+
+        elements.sort(key=lambda elem: elem.title)
+
+        tasks: List[Awaitable[None]] = []
+        for elem in elements:
+            tasks.append(asyncio.create_task(self._download_forum_thread(cl.path, elem)))
+
+        # And execute them
+        await self.gather(tasks)
+
+    @anoncritical
+    @_iorepeat(3, "saving forum thread")
+    async def _download_forum_thread(
+        self,
+        parent_path: PurePath,
+        element: IliasForumThread,
+    ) -> None:
+        path = parent_path / (_sanitize_path_name(element.title) + ".html")
+        maybe_dl = await self.download(path, mtime=element.mtime)
+        if not maybe_dl:
+            return
+
+        async with maybe_dl as (bar, sink):
+            content = element.title_tag.prettify()
+            content += element.content_tag.prettify()
+            sink.file.write(content.encode("utf-8"))
+            sink.done()
+
     async def _get_page(self, url: str) -> BeautifulSoup:
         auth_id = await self._current_auth_id()
         async with self.session.get(url) as request:
@@ -441,18 +743,49 @@ instance's greatest bottleneck.
                 return soup
         raise CrawlError("get_page failed even after authenticating")
 
+    async def _post_authenticated(
+        self,
+        url: str,
+        data: dict[str, Union[str, List[str]]]
+    ) -> BeautifulSoup:
+        auth_id = await self._current_auth_id()
+
+        form_data = aiohttp.FormData()
+        for key, val in data.items():
+            form_data.add_field(key, val)
+
+        async with self.session.post(url, data=form_data(), allow_redirects=False) as request:
+            if request.status == 200:
+                return await request.read()
+
+        # We weren't authenticated, so try to do that
+        await self.authenticate(auth_id)
+
+        # Retry once after authenticating. If this fails, we will die.
+        async with self.session.post(url, data=data, allow_redirects=False) as request:
+            if request.status == 200:
+                return await request.read()
+        raise CrawlError("post_authenticated failed even after authenticating")
+
     # 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
+    @ staticmethod
     def _is_logged_in(soup: BeautifulSoup) -> bool:
         # Normal ILIAS pages
-        userlog = soup.find("li", {"id": "userlog"})
+        mainbar: Optional[Tag] = soup.find(class_="il-maincontrols-metabar")
-        if userlog is not None:
+        if mainbar is not None:
+            login_button = mainbar.find(attrs={"href": 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(
@@ -490,14 +823,17 @@ class KitShibbolethLogin:
 
         # Equivalent: Click on "Mit KIT-Account anmelden" button in
         # https://ilias.studium.kit.edu/login.php
-        url = "https://ilias.studium.kit.edu/Shibboleth.sso/Login"
+        url = f"{_ILIAS_URL}/shib_login.php"
         data = {
             "sendLogin": "1",
             "idp_selection": "https://idp.scc.kit.edu/idp/shibboleth",
-            "target": "/shib_login.php",
+            "il_target": "",
-            "home_organization_selection": "Mit KIT-Account anmelden",
+            "home_organization_selection": "Weiter",
         }
-        soup: BeautifulSoup = await _post(sess, url, data)
+        soup: Union[BeautifulSoup, KitShibbolethBackgroundLoginSuccessful] = await _shib_post(sess, url, data)
+
+        if isinstance(soup, KitShibbolethBackgroundLoginSuccessful):
+            return
 
         # Attempt to login using credentials, if necessary
         while not self._login_successful(soup):
@@ -520,6 +856,12 @@ class KitShibbolethLogin:
             }
             soup = await _post(sess, url, data)
 
+            if soup.find(id="attributeRelease"):
+                raise CrawlError(
+                    "ILIAS Shibboleth entitlements changed! "
+                    "Please log in once in your browser and review them"
+                )
+
             if self._tfa_required(soup):
                 soup = await self._authenticate_tfa(sess, soup)
 
@@ -530,7 +872,7 @@ class KitShibbolethLogin:
         # (or clicking "Continue" if you have JS disabled)
         relay_state = soup.find("input", {"name": "RelayState"})
         saml_response = soup.find("input", {"name": "SAMLResponse"})
-        url = "https://ilias.studium.kit.edu/Shibboleth.sso/SAML2/POST"
+        url = f"{_ILIAS_URL}/Shibboleth.sso/SAML2/POST"
         data = {  # using the info obtained in the while loop above
             "RelayState": relay_state["value"],
             "SAMLResponse": saml_response["value"],
@@ -577,3 +919,51 @@ class KitShibbolethLogin:
 async def _post(session: aiohttp.ClientSession, url: str, data: Any) -> BeautifulSoup:
     async with session.post(url, data=data) as response:
         return soupify(await response.read())
+
+
+async def _shib_post(
+    session: aiohttp.ClientSession,
+    url: str,
+    data: Any
+) -> Union[BeautifulSoup, KitShibbolethBackgroundLoginSuccessful]:
+    """
+    aiohttp unescapes '/' and ':' in URL query parameters which is not RFC compliant and rejected
+    by Shibboleth. Thanks a lot. So now we unroll the requests manually, parse location headers and
+    build encoded URL objects ourselves... Who thought mangling location header was a good idea??
+    """
+    log.explain_topic("Shib login POST")
+    async with session.post(url, data=data, allow_redirects=False) as response:
+        location = response.headers.get("location")
+        log.explain(f"Got location {location!r}")
+        if not location:
+            raise CrawlWarning(f"Login failed (1), no location header present at {url}")
+        correct_url = yarl.URL(location, encoded=True)
+        log.explain(f"Corrected location to {correct_url!r}")
+
+        if str(correct_url).startswith(_ILIAS_URL):
+            log.explain("ILIAS recognized our shib token and logged us in in the background, returning")
+            return KitShibbolethBackgroundLoginSuccessful()
+
+        async with session.get(correct_url, allow_redirects=False) as response:
+            location = response.headers.get("location")
+            log.explain(f"Redirected to {location!r} with status {response.status}")
+            # If shib still still has a valid session, it will directly respond to the request
+            if location is None:
+                log.explain("Shib recognized us, returning its response directly")
+                return soupify(await response.read())
+
+            as_yarl = yarl.URL(response.url)
+            # Probably not needed anymore, but might catch a few weird situations with a nicer message
+            if not location or not as_yarl.host:
+                raise CrawlWarning(f"Login failed (2), no location header present at {correct_url}")
+
+            correct_url = yarl.URL.build(
+                scheme=as_yarl.scheme,
+                host=as_yarl.host,
+                path=location,
+                encoded=True
+            )
+            log.explain(f"Corrected location to {correct_url!r}")
+
+            async with session.get(correct_url, allow_redirects=False) as response:
+                return soupify(await response.read())

PFERD/crawl/kit_ipd_crawler.py

@@ -0,0 +1,170 @@
+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|cpp|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} (href={file.url!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} (href={file.url!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:
+            # The web page for Algorithmen für Routenplanung contains some
+            # weird comments that beautifulsoup doesn't parse correctly. This
+            # hack enables those pages to be crawled, and should hopefully not
+            # cause issues on other pages.
+            content = (await request.read()).decode("utf-8")
+            content = re.sub(r"<!--.*?-->", "", content)
+            return soupify(content.encode("utf-8"))

PFERD/deduplicator.py

@@ -56,6 +56,12 @@ class Deduplicator:
             log.explain(f"Changed path to {fmt_path(new_path)} for windows compatibility")
         return new_path
 
+    def fixup_path(self, path: PurePath) -> PurePath:
+        """Fixes up the path for windows, if enabled. Returns the path unchanged otherwise."""
+        if self._windows_paths:
+            return self._fixup_for_windows(path)
+        return path
+
     def mark(self, path: PurePath) -> PurePath:
         if self._windows_paths:
             path = self._fixup_for_windows(path)

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)
         self._live.update(group)
 
     @contextmanager
@@ -197,7 +197,7 @@ directly or as a GitHub issue: https://github.com/Garmelon/PFERD/issues/new
         if self.output_explain:
             self.print(f"  {escape(text)}")
 
-    def status(self, style: str, action: str, text: str) -> None:
+    def status(self, style: str, action: str, text: str, suffix: str = "") -> None:
         """
         Print a status update while crawling. Allows markup in the "style"
         argument which will be applied to the "action" string.
@@ -205,7 +205,7 @@ directly or as a GitHub issue: https://github.com/Garmelon/PFERD/issues/new
 
         if self.output_status:
             action = escape(f"{action:<{self.STATUS_WIDTH}}")
-            self.print(f"{style}{action}[/] {escape(text)}")
+            self.print(f"{style}{action}[/] {escape(text)} {suffix}")
 
     def report(self, text: str) -> None:
         """

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")
@@ -500,7 +503,7 @@ class OutputDirectory:
         try:
             self._prev_report = Report.load(self._report_path)
             log.explain("Loaded report successfully")
-        except (OSError, json.JSONDecodeError, ReportLoadError) as e:
+        except (OSError, UnicodeDecodeError, json.JSONDecodeError, ReportLoadError) as e:
             log.explain("Failed to load report")
             log.explain(str(e))
 

PFERD/pferd.py

@@ -15,13 +15,13 @@ class PferdLoadError(Exception):
 
 
 class Pferd:
-    def __init__(self, config: Config, cli_crawlers: Optional[List[str]]):
+    def __init__(self, config: Config, cli_crawlers: Optional[List[str]], cli_skips: Optional[List[str]]):
         """
         May throw PferdLoadError.
         """
 
         self._config = config
-        self._crawlers_to_run = self._find_crawlers_to_run(config, cli_crawlers)
+        self._crawlers_to_run = self._find_crawlers_to_run(config, cli_crawlers, cli_skips)
 
         self._authenticators: Dict[str, Authenticator] = {}
         self._crawlers: Dict[str, Crawler] = {}
@@ -65,16 +65,30 @@ class Pferd:
 
         return crawlers_to_run
 
-    def _find_crawlers_to_run(self, config: Config, cli_crawlers: Optional[List[str]]) -> List[str]:
+    def _find_crawlers_to_run(
+            self,
+            config: Config,
+            cli_crawlers: Optional[List[str]],
+            cli_skips: Optional[List[str]],
+    ) -> List[str]:
         log.explain_topic("Deciding which crawlers to run")
 
+        crawlers: List[str]
         if cli_crawlers is None:
             log.explain("No crawlers specified on CLI")
             log.explain("Running crawlers specified in config")
-            return self._find_config_crawlers(config)
+            crawlers = self._find_config_crawlers(config)
         else:
             log.explain("Crawlers specified on CLI")
-            return self._find_cli_crawlers(config, cli_crawlers)
+            crawlers = self._find_cli_crawlers(config, cli_crawlers)
+
+        skips = {f"crawl:{name}" for name in cli_skips} if cli_skips else set()
+        for crawler in crawlers:
+            if crawler in skips:
+                log.explain(f"Skipping crawler {crawler!r}")
+        crawlers = [crawler for crawler in crawlers if crawler not in skips]
+
+        return crawlers
 
     def _load_authenticators(self) -> None:
         for name, section in self._config.auth_sections():
@@ -168,5 +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, [])
@@ -81,13 +88,22 @@ 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":
         """
-        May raise OSError, JsonDecodeError, ReportLoadError.
+        May raise OSError, UnicodeDecodeError, JsonDecodeError, ReportLoadError.
         """
 
-        with open(path) as f:
+        with open(path, encoding="utf-8") as f:
             data = json.load(f)
 
         if not isinstance(data, dict):
@@ -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
 
@@ -124,9 +143,12 @@ 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:
+        with open(path, "w", encoding="utf-8") as f:
             json.dump(data, f, indent=2, sort_keys=True)
             f.write("\n")  # json.dump doesn't do this
 
@@ -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/transformer.py

@@ -41,9 +41,11 @@ TransformResult = Optional[Union[Transformed, Ignored]]
 @dataclass
 class Rule:
     left: str
+    left_index: int
     name: str
     head: ArrowHead
     right: RightSide
+    right_index: int
 
     def right_result(self, path: PurePath) -> Union[str, Transformed, Ignored]:
         if isinstance(self.right, str):
@@ -345,6 +347,7 @@ def parse_eol(line: Line) -> None:
 
 def parse_rule(line: Line) -> Rule:
     parse_zero_or_more_spaces(line)
+    left_index = line.index
     left = parse_left(line)
 
     parse_one_or_more_spaces(line)
@@ -354,19 +357,19 @@ def parse_rule(line: Line) -> Rule:
     line.expect("-")
     head = parse_arrow_head(line)
 
-    index = line.index
+    right_index = line.index
     right: RightSide
     try:
         parse_zero_or_more_spaces(line)
         parse_eol(line)
         right = Empty()
     except RuleParseError:
-        line.index = index
+        line.index = right_index
         parse_one_or_more_spaces(line)
         right = parse_right(line)
         parse_eol(line)
 
-    return Rule(left, name, head, right)
+    return Rule(left, left_index, name, head, right, right_index)
 
 
 def parse_transformation(line: Line) -> Transformation:
@@ -377,6 +380,9 @@ def parse_transformation(line: Line) -> Transformation:
     elif rule.name == "exact":
         return ExactTf(rule)
     elif rule.name == "name":
+        if len(PurePath(rule.left).parts) > 1:
+            line.index = rule.left_index
+            raise RuleParseError(line, "Expected name, not multiple segments")
         return RenamingPartsTf(ExactTf(rule))
     elif rule.name == "re":
         return RenamingParentsTf(ExactReTf(rule))

PFERD/update.py

@@ -0,0 +1,53 @@
+from dataclasses import dataclass
+import ssl
+from typing import Optional
+import aiohttp
+import certifi
+
+from .version import NAME, VERSION
+from .logging import log
+
+
+@dataclass
+class PferdUpdate:
+    release_url: str
+    version: str
+
+
+def _build_session() -> aiohttp.ClientSession:
+    return aiohttp.ClientSession(
+        headers={"User-Agent": f"{NAME}/{VERSION}"},
+        connector=aiohttp.TCPConnector(ssl=ssl.create_default_context(cafile=certifi.where())),
+        timeout=aiohttp.ClientTimeout(
+            total=15 * 60,
+            connect=10,
+            sock_connect=10,
+            sock_read=10,
+        )
+    )
+
+
+async def check_for_updates() -> None:
+    if new_version := await get_newer_version():
+        log.warn(
+            f"{NAME} version out of date. "
+            + f"You are running version {VERSION!r} but {new_version.version!r} was found on GitHub."
+        )
+        log.warn_contd(f"You can download it on GitHub: {new_version.release_url}")
+    else:
+        log.explain("No update found")
+
+
+async def get_newer_version() -> Optional[PferdUpdate]:
+    async with _build_session() as session:
+        async with session.get(
+            "https://api.github.com/repos/Garmelon/Pferd/releases/latest",
+            headers={"Accept": "application/vnd.github+json"}
+        ) as response:
+            release_information = await response.json()
+            tag_name: str = release_information["tag_name"]
+            tag_name = tag_name.removeprefix("v")
+            if VERSION == tag_name:
+                return None
+
+            return PferdUpdate(release_url=release_information["html_url"], version=tag_name)

PFERD/version.py

@@ -1,2 +1,2 @@
 NAME = "PFERD"
-VERSION = "3.1.0"
+VERSION = "3.4.1"

README.md

@@ -17,7 +17,7 @@ Binaries for Linux, Windows and Mac can be downloaded directly from the
 
 ### With pip
 
-Ensure you have at least Python 3.8 installed. Run the following command to
+Ensure you have at least Python 3.9 installed. Run the following command to
 install PFERD or upgrade it to the latest version:
 
 ```
@@ -26,6 +26,14 @@ $ pip install --upgrade git+https://github.com/Garmelon/PFERD@latest
 
 The use of [venv](https://docs.python.org/3/library/venv.html) is recommended.
 
+### With package managers
+
+Unofficial packages are available for:
+- [AUR](https://aur.archlinux.org/packages/pferd)
+- [nixpkgs](https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/misc/pferd/default.nix)
+
+See also PFERD's [repology page](https://repology.org/project/pferd/versions).
+
 ## Basic usage
 
 PFERD can be run directly from the command line with no config file. Run `pferd

setup.cfg

@@ -4,13 +4,13 @@ version = attr: PFERD.version.VERSION
 
 [options]
 packages = find:
-python_requires = >=3.8
+python_requires = >=3.9
 install_requires =
-  aiohttp>=3.7.4.post0
+  aiohttp>=3.8.1
-  beautifulsoup4>=4.9.3
+  beautifulsoup4>=4.10.0
-  rich>=10.1.0
+  rich>=11.0.0
-  keyring>=23.0.1
+  keyring>=23.5.0
-  certifi>=2020.12.5
+  certifi>=2021.10.8
 
 [options.entry_points]
 console_scripts =