pferd/PFERD/pferd.py
2020-05-12 14:41:13 +02:00

256 lines
10 KiB
Python

"""
Convenience functions for using PFERD.
"""
import logging
from pathlib import Path
from typing import Callable, List, Optional, Union
from .cookie_jar import CookieJar
from .diva import (DivaDownloader, DivaDownloadStrategy, DivaPlaylistCrawler,
diva_download_new)
from .errors import FatalException, swallow_and_print_errors
from .ilias import (IliasAuthenticator, IliasCrawler, IliasDirectoryFilter,
IliasDownloader, IliasDownloadInfo, IliasDownloadStrategy,
KitShibbolethAuthenticator, download_modified_or_new)
from .location import Location
from .logging import PrettyLogger
from .organizer import Organizer
from .tmp_dir import TmpDir
from .transform import TF, Transform, apply_transform
from .utils import PathLike, to_path
# TODO save known-good cookies as soon as possible
LOGGER = logging.getLogger(__name__)
PRETTY = PrettyLogger(LOGGER)
class Pferd(Location):
# pylint: disable=too-many-arguments
"""
The main entrypoint in your Pferd usage: This class combines a number of
useful shortcuts for running synchronizers in a single interface.
"""
def __init__(
self,
base_dir: Path,
tmp_dir: Path = Path(".tmp"),
test_run: bool = False
):
super().__init__(Path(base_dir))
self._tmp_dir = TmpDir(self.resolve(tmp_dir))
self._test_run = test_run
@staticmethod
def _print_transformables(transformables: List[TF]) -> None:
LOGGER.info("")
LOGGER.info("Results of the test run:")
for transformable in transformables:
LOGGER.info(transformable.path)
def _ilias(
self,
target: PathLike,
base_url: str,
crawl_function: Callable[[IliasCrawler], List[IliasDownloadInfo]],
authenticator: IliasAuthenticator,
cookies: Optional[PathLike],
dir_filter: IliasDirectoryFilter,
transform: Transform,
download_strategy: IliasDownloadStrategy,
clean: bool = True
) -> Organizer:
# pylint: disable=too-many-locals
cookie_jar = CookieJar(to_path(cookies) if cookies else None)
session = cookie_jar.create_session()
tmp_dir = self._tmp_dir.new_subdir()
organizer = Organizer(self.resolve(to_path(target)))
crawler = IliasCrawler(base_url, session, authenticator, dir_filter)
downloader = IliasDownloader(tmp_dir, organizer, session, authenticator, download_strategy)
cookie_jar.load_cookies()
info = crawl_function(crawler)
cookie_jar.save_cookies()
transformed = apply_transform(transform, info)
if self._test_run:
self._print_transformables(transformed)
return organizer
downloader.download_all(transformed)
cookie_jar.save_cookies()
if clean:
organizer.cleanup()
return organizer
@swallow_and_print_errors
def ilias_kit(
self,
target: PathLike,
course_id: str,
dir_filter: IliasDirectoryFilter = lambda x, y: True,
transform: Transform = lambda x: x,
cookies: Optional[PathLike] = None,
username: Optional[str] = None,
password: Optional[str] = None,
download_strategy: IliasDownloadStrategy = download_modified_or_new,
clean: bool = True,
) -> Organizer:
"""
Synchronizes a folder with the ILIAS instance of the KIT.
Arguments:
target {Path} -- the target path to write the data to
course_id {str} -- the id of the main course page (found in the URL after ref_id
when opening the course homepage)
Keyword Arguments:
dir_filter {IliasDirectoryFilter} -- A filter for directories. Will be applied on the
crawler level, these directories and all of their content is skipped.
(default: {lambdax:True})
transform {Transform} -- A transformation function for the output paths. Return None
to ignore a file. (default: {lambdax:x})
cookies {Optional[Path]} -- The path to store and load cookies from.
(default: {None})
username {Optional[str]} -- The SCC username. If none is given, it will prompt
the user. (default: {None})
password {Optional[str]} -- The SCC password. If none is given, it will prompt
the user. (default: {None})
download_strategy {DownloadStrategy} -- A function to determine which files need to
be downloaded. Can save bandwidth and reduce the number of requests.
(default: {download_modified_or_new})
clean {bool} -- Whether to clean up when the method finishes.
"""
# This authenticator only works with the KIT ilias instance.
authenticator = KitShibbolethAuthenticator(username=username, password=password)
PRETTY.starting_synchronizer(target, "ILIAS", course_id)
return self._ilias(
target=target,
base_url="https://ilias.studium.kit.edu/",
crawl_function=lambda crawler: crawler.crawl_course(course_id),
authenticator=authenticator,
cookies=cookies,
dir_filter=dir_filter,
transform=transform,
download_strategy=download_strategy,
clean=clean,
)
@swallow_and_print_errors
def ilias_kit_personal_desktop(
self,
target: PathLike,
dir_filter: IliasDirectoryFilter = lambda x, y: True,
transform: Transform = lambda x: x,
cookies: Optional[PathLike] = None,
username: Optional[str] = None,
password: Optional[str] = None,
download_strategy: IliasDownloadStrategy = download_modified_or_new,
clean: bool = True,
) -> Organizer:
"""
Synchronizes a folder with the ILIAS instance of the KIT. This method will crawl the ILIAS
"personal desktop" instead of a single course.
Arguments:
target {Path} -- the target path to write the data to
Keyword Arguments:
dir_filter {IliasDirectoryFilter} -- A filter for directories. Will be applied on the
crawler level, these directories and all of their content is skipped.
(default: {lambdax:True})
transform {Transform} -- A transformation function for the output paths. Return None
to ignore a file. (default: {lambdax:x})
cookies {Optional[Path]} -- The path to store and load cookies from.
(default: {None})
username {Optional[str]} -- The SCC username. If none is given, it will prompt
the user. (default: {None})
password {Optional[str]} -- The SCC password. If none is given, it will prompt
the user. (default: {None})
download_strategy {DownloadStrategy} -- A function to determine which files need to
be downloaded. Can save bandwidth and reduce the number of requests.
(default: {download_modified_or_new})
clean {bool} -- Whether to clean up when the method finishes.
"""
# This authenticator only works with the KIT ilias instance.
authenticator = KitShibbolethAuthenticator(username=username, password=password)
PRETTY.starting_synchronizer(target, "ILIAS", "Personal Desktop")
return self._ilias(
target=target,
base_url="https://ilias.studium.kit.edu/",
crawl_function=lambda crawler: crawler.crawl_personal_desktop(),
authenticator=authenticator,
cookies=cookies,
dir_filter=dir_filter,
transform=transform,
download_strategy=download_strategy,
clean=clean,
)
@swallow_and_print_errors
def diva_kit(
self,
target: Union[PathLike, Organizer],
playlist_location: str,
transform: Transform = lambda x: x,
download_strategy: DivaDownloadStrategy = diva_download_new,
clean: bool = True
) -> Organizer:
"""
Synchronizes a folder with a DIVA playlist.
Arguments:
organizer {Organizer} -- The organizer to use.
playlist_location {str} -- the playlist id or the playlist URL
in the format 'https://mediaservice.bibliothek.kit.edu/#/details/DIVA-2019-271'
Keyword Arguments:
transform {Transform} -- A transformation function for the output paths. Return None
to ignore a file. (default: {lambdax:x})
download_strategy {DivaDownloadStrategy} -- A function to determine which files need to
be downloaded. Can save bandwidth and reduce the number of requests.
(default: {diva_download_new})
clean {bool} -- Whether to clean up when the method finishes.
"""
tmp_dir = self._tmp_dir.new_subdir()
if playlist_location.startswith("http"):
playlist_id = DivaPlaylistCrawler.fetch_id(playlist_link=playlist_location)
else:
playlist_id = playlist_location
if target is None:
PRETTY.starting_synchronizer("None", "DIVA", playlist_id)
raise FatalException("Got 'None' as target directory, aborting")
if isinstance(target, Organizer):
organizer = target
else:
organizer = Organizer(self.resolve(to_path(target)))
PRETTY.starting_synchronizer(organizer.path, "DIVA", playlist_id)
crawler = DivaPlaylistCrawler(playlist_id)
downloader = DivaDownloader(tmp_dir, organizer, download_strategy)
info = crawler.crawl()
transformed = apply_transform(transform, info)
if self._test_run:
self._print_transformables(transformed)
return organizer
downloader.download_all(transformed)
if clean:
organizer.cleanup()
return organizer