[confluence] Refactor script (#218)

Make the script more readable, mostly by:

- using the endoflife.Product class,
- a little bit of renaming and documentation.

src/confluence.py

@@ -2,27 +2,19 @@ from requests_html import HTMLSession
 from common import dates
 from common import endoflife
 
-"""Fetch Confluence versions with their dates from the Atlassian Website.
+"""Fetches Confluence versions from www.atlassian.com.
 
-This script is using requests-html (https://requests-html.kennethreitz.org/)
-because the page needs JavaScript to render correctly.
-"""
+Note that requests_html is used because JavaScript is needed to render the page."""
 
-PRODUCT = 'confluence'
-URL = 'https://www.atlassian.com/software/confluence/download-archives'
-
-print(f"::group::{PRODUCT}")
-session = HTMLSession()
-r = session.get(URL)
+product = endoflife.Product("confluence")
+print(f"::group::{product.name}")
+r = HTMLSession().get("https://www.atlassian.com/software/confluence/download-archives")
 r.html.render(sleep=1, scrolldown=3)
 
-versions = {}
 for version_block in r.html.find('.versions-list'):
     version = version_block.find('a.product-versions', first=True).attrs['data-version']
     date_text = version_block.find('.release-date', first=True).text
-    date = dates.parse_date(date_text).strftime('%Y-%m-%d')
-    print(f"{version}: {date}")
-    versions[version] = date
+    product.declare_version(version, dates.parse_date(date_text))
 
-endoflife.write_releases(PRODUCT, versions)
+product.write()
 print("::endgroup::")