title_body: Calibre for metadata scraping
upvoted_answer: Yes, a calibre plugin could do that. Does one?  Not that I know of!
  
  You could look at the Extract ISBN plugin (http://www.mobileread.com/forums/showthread.php?t=126727) for an example of pulling data out of the ePub, and any of the metadata search plugins for how to then use the information you've found in a web search.