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Add in-browser EPUB reader (no JavaScript)

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- internal/library/reader.go: new Chapter type and Service.ReadChapter/
  ChapterAsset. Parses the EPUB spine, extracts and sanitizes each
  chapter's <body> HTML using golang.org/x/net/html:
  - strips <script>, <style>, <link>, <iframe>, <object>, <embed>,
    <form>, <meta>, <base>, <audio>, <video>, <noscript> and any
    on*-event-handler attributes
  - rewrites relative <img>/xlink:href asset references to
    /read/{id}/asset/{path}
  - rewrites internal chapter links to /read/{id}/{spineIndex},
    neutralizes javascript: hrefs, leaves external links untouched
  - refactored CoverBytes to share the new findEPUBPath helper
- internal/web/handlers.go: GET /read/{id}/{idx} renders a chapter page
  with prev/next navigation; GET /read/{id}/asset/{path...} serves
  embedded chapter assets (images) with a size cap, mirroring the
  existing cover-image guard
- views/pages.templ: new ReaderPage component (renders sanitized HTML
  via templ.Raw); BookPage gets an "Im Browser lesen" button next to
  the existing download button; templ regenerated
- static/styles.css: reader typography/layout, prev/next nav styling
- go.mod/go.sum: golang.org/x/net/html promoted to a direct dependency
- README: documents the new in-browser reader feature

Verified end-to-end with a hand-built test EPUB (spine ordering,
metadata, script/style stripping, event-handler stripping, chapter
link rewriting, image asset rewriting, javascript: neutralization,
external link passthrough, out-of-range chapter handling, and
path-traversal guard on chapter assets); test file removed afterwards
per repo convention (no test suite checked in yet).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
arnef
2026-08-15 16:17:16 +02:00
co-authored by Copilot
parent be3dfaeb47
commit 2399d8a5a6
9 changed files with 727 additions and 48 deletions
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go.mod
+7 -4
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@@ -2,7 +2,13 @@ module github.com/arnef/ebooks
go 1.25.0
require github.com/a-h/templ v0.3.1020
require (
github.com/a-h/templ v0.3.1020
golang.org/x/crypto v0.55.0
golang.org/x/net v0.58.0
golang.org/x/term v0.45.0
modernc.org/sqlite v1.56.0
)
require (
github.com/dustin/go-humanize v1.0.1 // indirect
@@ -10,11 +16,8 @@ require (
github.com/mattn/go-isatty v0.0.24 // indirect
github.com/ncruces/go-strftime v1.0.0 // indirect
github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
golang.org/x/crypto v0.54.0 // indirect
golang.org/x/sys v0.47.0 // indirect
golang.org/x/term v0.45.0 // indirect
modernc.org/libc v1.74.4 // indirect
modernc.org/mathutil v1.7.1 // indirect
modernc.org/memory v1.11.0 // indirect
modernc.org/sqlite v1.56.0 // indirect
)