[Feat] Adds support for multiple chapters.

[pilotMike]

Adds support for multiple chapters. The previous version ignored any leading chapter numbers in the uri of {chapterId}/images/{image}. It now accounts for that and is working in a locally run user interface for an epub that was broken. I didn't check in the unit test over the GetBookPage method since it requires a specific file.

I can provide a link to the specific epub that wasn't working - it's 50MB though.

References: #3800

Added

• Multi-chapter support that can show up in merged epubs. Chapter URIs were previously ignoring everything except the last end of an image or stylesheet uri, which could result in multiple matches and fail. It now works.

Changed

• BookService in getting image keys and stylesheet keys. The page variable is now getting passed down and included in the key uri logic.
• BookController to also use chapter number in generating a key

Fixed

• Fixed: Fixed a bug (Fixes #issue 3800)

Not included unit test

// Test included as example. I can provide a link to the file for further testing.
    /// <summary>
    /// Scenario: a manga volume that was created by stitching together the chapters in Calibre has 2 cover files:
    /// * cover.jpg
    /// * 1/cover.jpeg
    /// * 1/images/00001.jpg
    ///
    /// With the image file determined as cover.jpeg (note the 'e').
    /// As a result, it was not found with single or default
    /// </summary>
    [Theory]
    [MemberData(nameof(ChapterLists))]
    public async Task ShouldParseSecondPageComicStitchedTogetherInCalibre(int page)
    {
        var bookPath = Path.Combine("Data", "The Color of the End - Haruo Iwamune.epub");

        var page2 = await _bookService.GetBookPage(page, 0,  bookPath, "");
    }

    public static IEnumerable<object[]> ChapterLists() => Enumerable.Range(0, 9).Select(i => new object[] { i });

Previous Result:

Current Result:

Screen.Recording.2025-05-13.at.11.36.39.AM.mov

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[pilotMike]

@majora2007 tagging in case this is something that you'd want to incorporate :)

[majora2007]

User sent file: The Color of the End - Haruo Iwamune.epub for testing this issue

[majora2007]

@pilotMike I was trying to find the file you sent me. Can you resend it to me so I can try to understand what this is trying to fix?

[pilotMike]

@majora2007 Here is a burn after reading bin link to the file. Let me know if I need to resend another https://paste.michaeldileo.org/?6bc3d13ab21fd428#-Dy61zGXfnk4ocHYCEe5vMYoDRk6vpkfmaPTfX3gbUWC3

[majora2007]

Thanks

[majora2007]

I looked at the epub and it's not valid. It is essentially an epub with multiple folders within, each folder being a self contained epub. That's not part of the standard and seems to just be hacked together.

How did you come across this book? Are you creating it to keep multiple chapters into a series (you would probably be better off taking each folder and just zipping into a chapter.epub)

[pilotMike]

Its been a while since I did it, but iirc, each chapter was available individually of the manga and the "book" you'd buy had a certain number of chapters. I downloaded each chapter of the book and imported it into Calibre to combine/merge into a single epub. This file was how calibre did the output. For what it's worth, other e-reader software is able to open this file, such as the e-reader on OSX (and calibre of course).