Add last.fm backend importer - interim check in

[amCap1712]

No description provided.

[pep8speaks]

Hello @amCap1712! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file listenbrainz/db/external_service_oauth.py:

Line 12:131: E501 line too long (138 > 130 characters)

• In the file listenbrainz/listens_importer/lastfm.py:

Line 76:5: E303 too many blank lines (2)
Line 100:5: E303 too many blank lines (2)

Comment last updated at 2024-10-25 14:58:35 UTC

[amCap1712]

@MonkeyDo need your help to add a way for users to link their last.fm account with ListenBrainz. The last.fm username is required and the time they want to start their import from is optional. The data should be posted in a JSON body like {"external_user_id": "amCap1712", "latest_listened_at": "2024-10-24T10:10:53.519338"} to https://(beta.|test.)listenbrainz.org/settings/music-services/lastfm/connect/

[MonkeyDo]

Making latest_listened_at optional

Suggested change

	try:
	latest_listened_at = datetime.fromisoformat(data["latest_listened_at"])
	except (ValueError, TypeError):
	raise APIBadRequest(f"Value of latest_listened_at '{data['latest_listened_at']} is invalid.")
	latest_listened_at = None
	if data["latest_listened_at"] is not None:
	try:
	latest_listened_at = datetime.fromisoformat(data["latest_listened_at"])
	except (ValueError, TypeError):
	raise APIBadRequest(f"Value of latest_listened_at '{data['latest_listened_at']} is invalid.")

[MonkeyDo]

Let me know if that does the trick