Add support for TGI website

PFERD/__init__.py

@@ -3,6 +3,7 @@ import logging
 from .ffm import *
 from .ilias import *
 from .norbert import *
+from .tgi import *
 from .ti import *
 from .utils import *
 
@@ -11,6 +12,7 @@ __all__ = ["STYLE", "FORMAT", "DATE_FORMAT", "FORMATTER", "enable_logging"]
 __all__ += ffm.__all__
 __all__ += ilias.__all__
 __all__ += norbert.__all__
+__all__ += tgi.__all__
 __all__ += ti.__all__
 __all__ += utils.__all__
 

PFERD/tgi.py

@@ -0,0 +1,75 @@
+# TGI Lecture slides
+
+import logging
+import pathlib
+import re
+import zipfile
+
+import bs4
+import requests
+
+from .organizer import Organizer
+from .utils import rename, stream_to_path, PrettyLogger
+
+__all__ = ["TGI"]
+logger = logging.getLogger(__name__)
+pretty = PrettyLogger(logger)
+
+class TGI:
+    CRAWL_URL = "https://i11www.iti.kit.edu/teaching/winter2019/tgi/index"
+    BASE_URL = "https://i11www.iti.kit.edu"
+    LINK_RE = re.compile(r"^/_media/teaching/.*?/(tgi-\d+-\d+-)([^/]*\.pdf)$")
+
+    def __init__(self, base_path):
+        self.base_path = base_path
+
+        self._session = requests.Session()
+
+    def synchronize(self, to_dir, transform=lambda x: x):
+        pretty.starting_synchronizer(to_dir, "TGI")
+
+        sync_path = pathlib.Path(self.base_path, to_dir)
+        orga = Organizer(self.base_path, sync_path)
+
+        orga.clean_temp_dir()
+
+        files = self._crawl()
+        self._download(orga, files, transform)
+
+        orga.clean_sync_dir()
+        orga.clean_temp_dir()
+
+    def _crawl(self):
+        url = self.CRAWL_URL
+        r = self._session.get(url)
+
+        text = r.text
+        soup = bs4.BeautifulSoup(text, "html.parser")
+
+        files = []
+
+        for found in soup.find_all("a", href=self.LINK_RE):
+            url = found["href"]
+            full_url = self.BASE_URL + url
+
+            filename = re.search(self.LINK_RE, url).group(2)
+            path = pathlib.PurePath(filename)
+
+            logger.debug(f"Found file {filename} at {full_url}")
+            files.append((path, full_url))
+
+        return files
+
+    def _download(self, orga, files, transform):
+        for path, url in sorted(files):
+            logger.debug(f"Downloading {path}")
+
+            new_path = transform(path)
+            if new_path is not None:
+                temp_file = orga.temp_file()
+                self._download_file(url, temp_file)
+                orga.add_file(temp_file, new_path)
+
+    def _download_file(self, url, to_path):
+        with self._session.get(url, stream=True) as r:
+            stream_to_path(r, to_path)