epub output parsing errors

[blogbourri]

Data

• Shiori version: ghcr.io/go-shiori/shiori:latest
• Database Engine: mysql
• Operating system: synology
• CLI/Web interface/Web Extension: web interface

Describe the bug / actual behavior

Epub files currently output are malformed. This caused the following error on calibre-web, which was resolved when I removed the malformed epubs from my library:

janeczku/calibre-web#2834

Note from the error message:

lxml.etree.XMLSyntaxError: Namespace prefix dc on title is not defined, line 4, column 14

Checking the epubs with epubcheck returns three errors:

ERROR(RSC-005): ./books/Bo/databases/eBookIt/temp_uploads/1690815957.epub/OEBPS/content.opf(-1,-1): Error while parsing file: The prefix "dc" for element "dc:title" is not bound.

ERROR(OPF-001): ./books/Bo/databases/eBookIt/temp_uploads/1690815957.epub/OEBPS/content.opf(-1,-1): There was an error when parsing the EPUB version: Version not found.

ERROR(PKG-007): ./books/Bo/databases/eBookIt/temp_uploads/1690815957.epub/mimetype(-1,-1): Mimetype file should only contain the string "application/epub+zip" and should not be compressed.

Therefore, it seems to be the title element specifically that is causing the issue here, but there shouldn't be the other errors either.

Expected behavior

Epubs should be valid against W3C standards and compatible with standard epub software.

To Reproduce

Steps to reproduce the behavior:

1. Validate epub from shiori here or with epubcheck: https://www.ebookit.com/tools/bp/Bo/eBookIt/epub-validator

[fmartingr]

Thanks for raising awareness of this. Ebooks is a very recent feature and we are currently working on it.

Leaving this here as well, which would make easy to make tests for this:

https://www.w3.org/publishing/epubcheck/

[Monirzadeh]

@blogbourri Thanks for report, we work on this can you please give me a link example?
Or confirm if this file work fine in your device? (image too)
book.zip

[blogbourri]

@blogbourri Thanks for report, we work on this can you please give me a link example? Or confirm if this file work fine in your device? (image too) book.zip

just tested your epub and yes it does work :)

if you still want an example that breaks it, you can try this one:

https://bookmark.colorbash.art/bookmark/25/content