Capture username in Medium RSS schema

[razbenya]

Summary

The Medium RSS schema currently captures fullname, image, and latest_activity_at, but leaves username empty. The username is sitting right in the channel's <link> element — adding a named-capture group for it.

Reproducer (before)

python3 -c "
from socid_extractor import extract
import urllib.request, ssl
ctx = ssl.create_default_context(); ctx.check_hostname = False; ctx.verify_mode = ssl.CERT_NONE
req = urllib.request.Request('https://medium.com/feed/@blue', headers={'User-Agent': 'Mozilla/5.0'})
body = urllib.request.urlopen(req, context=ctx).read().decode()
print(extract(body))
"
# -> {'fullname': 'Medium Staff', 'image': '...', 'latest_activity_at': '...'}  (no username)

After this patch, the same call also returns 'username': 'blue'.

Why this matters

Useful for --parse flows against a Medium URL where the username has to be discovered from the page content rather than supplied as input. The older Medium HTML schema (still present in the file, for completeness) already exposed medium_username — this restores parity for the RSS path.

Test

import re
body = open('medium_feed.xml').read()  # any user's RSS feed
m = re.search(<new regex>, body, re.MULTILINE)
assert m.groupdict() == {'fullname': '…', 'username': '…', 'image': 'https://…', 'latest_activity_at': '…'}

[soxoj]

Thanks 👍