I just created this simple and dirty plugin as my practice.
Mainly it's for the users that use Traditional Chinese.
It will try to download the metadata from
books.com.tw.
Since I'm still not able to handle the issue with cover image, it could not support to download the cover image for now.
Touched fields:
Title, Authors, Identities, Publisher, Published Date, Language, Comments, Rating
Source code has been placed at
here