[virtualbox] Add automation (#438)

Using https://www.virtualbox.org/wiki/Download_Old_Builds.

src/common/dates.py

@@ -25,6 +25,7 @@ def parse_month_year_date(text: str, formats: list[str] = frozenset([
     "%B %Y",  # January 2020
     "%b %Y",  # Jan 2020
     "%Y-%m",  # 2020-01
+    "%Y/%m",  # 2020/01
     "%m-%Y",  # 01-2020
     "%m/%Y",  # 01/2020
 ])) -> datetime:

src/virtualbox.py

@@ -0,0 +1,35 @@
+import logging
+import re
+
+from bs4 import BeautifulSoup
+from common import dates, http, releasedata
+
+"""Fetches releases from VirtualBox download page."""
+
+RELEASE_REGEX = re.compile(r"^VirtualBox (?P<value>\d+\.\d+)$")
+EOL_REGEX = re.compile(r"^\(no longer supported, support ended (?P<value>\d{4}/\d{2})\)$")
+
+with releasedata.ProductData("virtualbox") as product_data:
+    response = http.fetch_url("https://www.virtualbox.org/wiki/Download_Old_Builds")
+    soup = BeautifulSoup(response.text, features="html5lib")
+
+    for li in soup.select_one("#DownloadVirtualBoxOldBuilds + ul").find_all("li"):
+        li_text = li.find("a").text.strip()
+
+        release_match = RELEASE_REGEX.match(li_text)
+        if not release_match:
+            logging.info(f"Skipping '{li_text}': does not match {RELEASE_REGEX}")
+            continue
+
+        release_name = release_match.group("value")
+        release = product_data.get_release(release_name)
+
+        eol_text = li.find("em").text.lower().strip()
+        eol_match = EOL_REGEX.match(eol_text)
+        if not eol_match:
+            logging.info(f"Ignoring '{eol_text}': does not match {EOL_REGEX}")
+            continue
+
+        eol_date_str = eol_match.group("value")
+        eol_date = dates.parse_month_year_date(eol_date_str)
+        release.set_eol(eol_date)