Add in-browser EPUB reader (no JavaScript)

- 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>
2026-08-15 16:17:16 +02:00
parent be3dfaeb47
commit 2399d8a5a6
9 changed files with 727 additions and 48 deletions
@@ -6,6 +6,7 @@ Minimalistische eBook-Bibliothek für den Tolino-Webbrowser.
 - Listet EPUB-Dateien aus `books/`
 - Detailseite pro Buch
 - Im Browser lesen (serverseitig gerenderte Kapitel, kein JavaScript nötig)
 - Download-Link pro Buch (für Tolino)
 - Schlichtes, kontrastreiches UI ohne JavaScript-Abhängigkeit
 - Login-Pflicht (Session-Cookie, 30 Tage)
@@ -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
 )
@@ -4,25 +4,57 @@ github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkp
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/pprof v0.0.0-20260802141513-ef3492d7dac3 h1:LMLX+LgTNWpfvCBdFebv6EsYotImrt/Ppc5cXIriCSo=
 github.com/google/pprof v0.0.0-20260802141513-ef3492d7dac3/go.mod h1:jl5iWTm0/hd5PjEYEOuwAJ57L/CibdZfrqZ5XA5GrCk=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
 github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/mattn/go-isatty v0.0.24 h1:tGZZoVgT/KiqK1c8ocVLeDS8BSWMRd47J3Lbz7vsReI=
 github.com/mattn/go-isatty v0.0.24/go.mod h1:nMCL3Zebbrt45jsMDgnfIwz6ydEQApk5oEI3HqDio6A=
 github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
 github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
-golang.org/x/crypto v0.54.0 h1:YLIA59K4fiNzHzjnZt2tUJQjQtUWfWbeHBqKtk3eScw=
+golang.org/x/crypto v0.55.0 h1:+KWHjbgOaAQ66dh/YlkZKHlz9ZUlq61AFirAR9ntP8M=
-golang.org/x/crypto v0.54.0/go.mod h1:KWL8ny2AZdGR2cWmzeHrp2azQPGogOv+HeQaVEXC2dk=
+golang.org/x/crypto v0.55.0/go.mod h1:uq0V9dE/fzQuJtbnL+2EhWOE63vo164FY8xqEnV9xis=
 golang.org/x/mod v0.37.0 h1:vF1DjpVEshcIqoEaauuHebaLk1O1forxjxBaVn884JQ=
 golang.org/x/mod v0.37.0/go.mod h1:m8S8VeM9r4dzDwjrKO0a1sZP3YjeMamRRlD+fmR2Q/0=
 golang.org/x/net v0.58.0 h1:ynWG7rqYi4ccpTEuPZ2QGWHktVEM9DMCj9yzDE0Q7To=
 golang.org/x/net v0.58.0/go.mod h1:YwCddHnFlT7eLQqVprV19OnhLGtc5xOKgE0RyqgfWAU=
 golang.org/x/sync v0.21.0 h1:HLII4xRRTtCRkxYp4HNFF0Js/Og6q2i++KXbg0gHCwM=
 golang.org/x/sync v0.21.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
 golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/term v0.45.0 h1:NwWyBmoJCbfTHpxrWoZ9C6/VxOf7ic219I8xZZFdrf0=
 golang.org/x/term v0.45.0/go.mod h1:9aqxs0blBcrm/n0L9QW0aRVD+ktan8ssZromtqJC43w=
 golang.org/x/tools v0.47.0 h1:7Kn5x/d1svx/PzryTsqeoZN4TZwqeH5pGWjefhLi/1Q=
 golang.org/x/tools v0.47.0/go.mod h1:dFHnyTvFWY212G+h7ZY4Vsp/K3U4/7W9TyVaAul8uCA=
 modernc.org/cc/v4 v4.29.1 h1:MKgdCV3WykTSPqpVrnxdEDS0HEd2FHpKZDzxzU5LyeI=
 modernc.org/cc/v4 v4.29.1/go.mod h1:OnovgIhbbMXMu1aISnJ0wvVD1KnW+cAUJkIrAWh+kVI=
 modernc.org/ccgo/v4 v4.34.6 h1:sBgfIwyN0TQ9C5hwIeuqyeAKyMWnbvj2fvpF4L11uzU=
 modernc.org/ccgo/v4 v4.34.6/go.mod h1:SZ8YcN9NG7XVsQYdm6jYBvi8PQP1qi+kqB6OhjqI3Fk=
 modernc.org/fileutil v1.4.0 h1:j6ZzNTftVS054gi281TyLjHPp6CPHr2KCxEXjEbD6SM=
 modernc.org/fileutil v1.4.0/go.mod h1:EqdKFDxiByqxLk8ozOxObDSfcVOv/54xDs/DUHdvCUU=
 modernc.org/gc/v2 v2.6.5 h1:nyqdV8q46KvTpZlsw66kWqwXRHdjIlJOhG6kxiV/9xI=
 modernc.org/gc/v2 v2.6.5/go.mod h1:YgIahr1ypgfe7chRuJi2gD7DBQiKSLMPgBQe9oIiito=
 modernc.org/gc/v3 v3.1.4 h1:2g65LGVSmFQrXeITAw97x7hCRvZFcyE1uDP+7Vng7JI=
 modernc.org/gc/v3 v3.1.4/go.mod h1:HFK/6AGESC7Ex+EZJhJ2Gni6cTaYpSMmU/cT9RmlfYY=
 modernc.org/goabi0 v0.2.0 h1:HvEowk7LxcPd0eq6mVOAEMai46V+i7Jrj13t4AzuNks=
 modernc.org/goabi0 v0.2.0/go.mod h1:CEFRnnJhKvWT1c1JTI3Avm+tgOWbkOu5oPA8eH8LnMI=
 modernc.org/libc v1.74.4 h1:fX1Omw4o2/1C2iRkkIsrQTasJQldLhRmuPreXLoWs9k=
 modernc.org/libc v1.74.4/go.mod h1:eeQAS9W3sZeKYMFubydxJpII9ybHWshk+7or7bLG9co=
 modernc.org/mathutil v1.7.1 h1:GCZVGXdaN8gTqB1Mf/usp1Y/hSqgI2vAGGP4jZMCxOU=
 modernc.org/mathutil v1.7.1/go.mod h1:4p5IwJITfppl0G4sUEDtCr4DthTaT47/N3aT6MhfgJg=
 modernc.org/memory v1.11.0 h1:o4QC8aMQzmcwCK3t3Ux/ZHmwFPzE6hf2Y5LbkRs+hbI=
 modernc.org/memory v1.11.0/go.mod h1:/JP4VbVC+K5sU2wZi9bHoq2MAkCnrt2r98UGeSK7Mjw=
 modernc.org/opt v0.2.0 h1:tGyef5ApycA7FSEOMraay9SaTk5zmbx7Tu+cJs4QKZg=
 modernc.org/opt v0.2.0/go.mod h1:03fq9lsNfvkYSfxrfUhZCWPk1lm4cq4N+Bh//bEtgns=
 modernc.org/sortutil v1.2.1 h1:+xyoGf15mM3NMlPDnFqrteY07klSFxLElE2PVuWIJ7w=
 modernc.org/sortutil v1.2.1/go.mod h1:7ZI3a3REbai7gzCLcotuw9AC4VZVpYMjDzETGsSMqJE=
 modernc.org/sqlite v1.56.0 h1:/D8e2RfFqoy/Zc6PuC76U28zFwmI/sYx1Kjm4yEn9e0=
 modernc.org/sqlite v1.56.0/go.mod h1:yCJ2cmAaIkHQ25oXWrF8H4O1lIfPYPR26yCEDj2P3pQ=
 modernc.org/strutil v1.2.1 h1:UneZBkQA+DX2Rp35KcM69cSsNES9ly8mQWD71HKlOA0=
 modernc.org/strutil v1.2.1/go.mod h1:EHkiggD70koQxjVdSBM3JKM7k6L0FbGE5eymy9i3B9A=
 modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
 modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
@@ -102,29 +102,11 @@ func (s *Service) CoverBytes(id string) ([]byte, string, error) {
 		return nil, "", nil
 	}
-	entries, err := os.ReadDir(s.booksDir)
+	fullPath, err := s.findEPUBPath(id)
-	if err != nil {
+	if err != nil || fullPath == "" {
 		if os.IsNotExist(err) {
 			return nil, "", nil
 		}
 		return nil, "", err
 	}
-
+	return readEPUBCover(fullPath)
 	for _, e := range entries {
 		if e.IsDir() {
 			continue
 		}
 		ext := strings.ToLower(filepath.Ext(e.Name()))
 		if ext != ".epub" {
 			continue
 		}
 		if stableID(e.Name()) != id {
 			continue
 		}
 		return readEPUBCover(filepath.Join(s.booksDir, e.Name()))
 	}
 	return nil, "", nil
 }
 func stableID(input string) string {
@@ -161,6 +143,11 @@ type packageXML struct {
 			Properties string `xml:"properties,attr"`
 		} `xml:"item"`
 	} `xml:"manifest"`
 	Spine struct {
 		Itemrefs []struct {
 			IDref string `xml:"idref,attr"`
 		} `xml:"itemref"`
 	} `xml:"spine"`
 }
 func readEPUBMetadata(filePath string) (epubMetadata, error) {
@@ -0,0 +1,369 @@
 package library
 import (
 	"archive/zip"
 	"bytes"
 	"errors"
 	"fmt"
 	"io"
 	"net/url"
 	"os"
 	"path"
 	"path/filepath"
 	"strings"
 	"golang.org/x/net/html"
 	"golang.org/x/net/html/atom"
 )
 // ErrChapterNotFound is returned by ReadChapter when the requested chapter
 // index is out of range for the book's spine.
 var ErrChapterNotFound = errors.New("chapter not found")
 // maxChapterBytes/maxAssetBytes cap how much we read from a zip entry to
 // avoid decompression-bomb style abuse, mirroring the cover image limit.
 const (
 	maxChapterBytes = 5 << 20  // 5 MiB
 	maxAssetBytes   = 15 << 20 // 15 MiB (images/fonts referenced by a chapter)
 )
 // Chapter is a sanitized, ready-to-render view of one EPUB spine entry for
 // the in-browser reader. HTML is safe to render unescaped (templ.Raw) -
 // scripts, event handlers and stylesheet/style tags have been stripped and
 // internal links/images rewritten to point at reader routes.
 type Chapter struct {
 	Index     int
 	Total     int
 	Title     string
 	HTML      string
 	HasPrev   bool
 	HasNext   bool
 	PrevIndex int
 	NextIndex int
 }
 // ReadChapter renders the sanitized body HTML of the spine item at index for
 // in-browser reading. It returns ErrChapterNotFound if index is out of range.
 func (s *Service) ReadChapter(id string, index int) (*Chapter, error) {
 	fullPath, err := s.findEPUBPath(id)
 	if err != nil {
 		return nil, err
 	}
 	if fullPath == "" {
 		return nil, ErrChapterNotFound
 	}
 	r, rootPath, pkg, err := openEPUBPackage(fullPath)
 	if err != nil {
 		return nil, err
 	}
 	defer r.Close()
 	spine := epubSpine(rootPath, pkg)
 	if len(spine) == 0 {
 		return nil, fmt.Errorf("epub has no readable chapters")
 	}
 	if index < 0 || index >= len(spine) {
 		return nil, ErrChapterNotFound
 	}
 	data, err := readZipFileLimited(r.File, spine[index], maxChapterBytes)
 	if err != nil {
 		return nil, err
 	}
 	title, body, err := parseChapterDocument(data)
 	if err != nil {
 		return nil, err
 	}
 	spineIndex := make(map[string]int, len(spine))
 	for i, p := range spine {
 		spineIndex[p] = i
 	}
 	assetBase := path.Dir(spine[index])
 	sanitizeBody(body, id, assetBase, spineIndex)
 	var buf bytes.Buffer
 	for c := body.FirstChild; c != nil; c = c.NextSibling {
 		if err := html.Render(&buf, c); err != nil {
 			return nil, err
 		}
 	}
 	ch := &Chapter{
 		Index: index,
 		Total: len(spine),
 		Title: title,
 		HTML:  buf.String(),
 	}
 	if index > 0 {
 		ch.HasPrev = true
 		ch.PrevIndex = index - 1
 	}
 	if index < len(spine)-1 {
 		ch.HasNext = true
 		ch.NextIndex = index + 1
 	}
 	return ch, nil
 }
 // ChapterAsset returns the raw bytes and content type of a file embedded in
 // the given book's EPUB (e.g. an image referenced by a chapter). assetPath
 // must already be a zip-internal path (see cleanEPUBPath). Returns
 // (nil, "", nil) if the book or the asset doesn't exist.
 func (s *Service) ChapterAsset(id, assetPath string) ([]byte, string, error) {
 	fullPath, err := s.findEPUBPath(id)
 	if err != nil || fullPath == "" {
 		return nil, "", err
 	}
 	cleanPath := path.Clean(assetPath)
 	if cleanPath == "." || cleanPath == ".." || strings.HasPrefix(cleanPath, "../") || strings.HasPrefix(cleanPath, "/") {
 		return nil, "", fmt.Errorf("invalid asset path")
 	}
 	r, err := zip.OpenReader(fullPath)
 	if err != nil {
 		return nil, "", err
 	}
 	defer r.Close()
 	data, err := readZipFileLimited(r.File, cleanPath, maxAssetBytes)
 	if err != nil {
 		if errors.Is(err, os.ErrNotExist) {
 			return nil, "", nil
 		}
 		return nil, "", err
 	}
 	return data, detectContentType(data, cleanPath), nil
 }
 // findEPUBPath locates the on-disk path of the book with the given id.
 func (s *Service) findEPUBPath(id string) (string, error) {
 	entries, err := os.ReadDir(s.booksDir)
 	if err != nil {
 		if os.IsNotExist(err) {
 			return "", nil
 		}
 		return "", err
 	}
 	for _, e := range entries {
 		if e.IsDir() {
 			continue
 		}
 		if strings.ToLower(filepath.Ext(e.Name())) != ".epub" {
 			continue
 		}
 		if stableID(e.Name()) != id {
 			continue
 		}
 		return filepath.Join(s.booksDir, e.Name()), nil
 	}
 	return "", nil
 }
 // epubSpine returns the cleaned, zip-internal paths of the book's content
 // documents in reading order.
 func epubSpine(rootPath string, pkg packageXML) []string {
 	manifestByID := make(map[string]string, len(pkg.Manifest.Items))
 	for _, it := range pkg.Manifest.Items {
 		manifestByID[it.ID] = it.Href
 	}
 	spine := make([]string, 0, len(pkg.Spine.Itemrefs))
 	for _, ref := range pkg.Spine.Itemrefs {
 		href, ok := manifestByID[ref.IDref]
 		if !ok {
 			continue
 		}
 		cleaned := cleanEPUBPath(rootPath, href)
 		if cleaned == "" {
 			continue
 		}
 		spine = append(spine, cleaned)
 	}
 	return spine
 }
 // readZipFileLimited reads a zip entry fully, refusing to read more than
 // maxBytes to avoid decompression-bomb style abuse.
 func readZipFileLimited(files []*zip.File, name string, maxBytes int64) ([]byte, error) {
 	cleanName := path.Clean(name)
 	for _, f := range files {
 		if path.Clean(f.Name) != cleanName {
 			continue
 		}
 		if int64(f.UncompressedSize64) > maxBytes {
 			return nil, fmt.Errorf("file too large: %s", name)
 		}
 		rc, err := f.Open()
 		if err != nil {
 			return nil, err
 		}
 		defer rc.Close()
 		data, err := io.ReadAll(io.LimitReader(rc, maxBytes+1))
 		if err != nil {
 			return nil, err
 		}
 		if int64(len(data)) > maxBytes {
 			return nil, fmt.Errorf("file too large: %s", name)
 		}
 		return data, nil
 	}
 	return nil, os.ErrNotExist
 }
 // parseChapterDocument parses an XHTML/HTML content document and returns its
 // <title> text (if any) and its <body> node.
 func parseChapterDocument(data []byte) (string, *html.Node, error) {
 	doc, err := html.Parse(bytes.NewReader(data))
 	if err != nil {
 		return "", nil, err
 	}
 	var title string
 	var body *html.Node
 	var walk func(*html.Node)
 	walk = func(n *html.Node) {
 		if n.Type == html.ElementNode {
 			switch n.DataAtom {
 			case atom.Title:
 				if n.FirstChild != nil && n.FirstChild.Type == html.TextNode {
 					title = strings.TrimSpace(n.FirstChild.Data)
 				}
 			case atom.Body:
 				body = n
 			}
 		}
 		for c := n.FirstChild; c != nil; c = c.NextSibling {
 			walk(c)
 		}
 	}
 	walk(doc)
 	if body == nil {
 		return title, nil, fmt.Errorf("chapter document has no <body>")
 	}
 	return title, body, nil
 }
 // blockedChapterTags are stripped entirely (with their subtree) from chapter
 // content: scripts/forms for security, styles/links/meta/base because the
 // reader uses its own site-wide stylesheet, and audio/video/iframe/object
 // because their sources aren't served by the reader.
 var blockedChapterTags = map[string]bool{
 	"script": true, "iframe": true, "object": true, "embed": true,
 	"form": true, "meta": true, "base": true, "link": true, "style": true,
 	"applet": true, "audio": true, "video": true, "noscript": true,
 }
 // sanitizeBody strips dangerous/unsupported elements and attributes from a
 // chapter's body content in place, and rewrites relative image sources and
 // internal chapter links so they resolve against the reader's routes.
 func sanitizeBody(body *html.Node, bookID, assetBase string, spineIndex map[string]int) {
 	for c := body.FirstChild; c != nil; {
 		next := c.NextSibling
 		sanitizeNode(c, bookID, assetBase, spineIndex)
 		c = next
 	}
 }
 func sanitizeNode(n *html.Node, bookID, assetBase string, spineIndex map[string]int) {
 	if n.Type == html.ElementNode && blockedChapterTags[strings.ToLower(n.Data)] {
 		if n.Parent != nil {
 			n.Parent.RemoveChild(n)
 		}
 		return
 	}
 	if n.Type == html.ElementNode {
 		attrs := n.Attr[:0]
 		for _, a := range n.Attr {
 			key := strings.ToLower(a.Key)
 			if strings.HasPrefix(key, "on") {
 				continue // strip inline event handlers (onclick, onload, ...)
 			}
 			switch key {
 			case "src":
 				a.Val = rewriteAssetRef(a.Val, bookID, assetBase)
 			case "href":
 				if strings.EqualFold(n.Data, "a") {
 					a.Val = rewriteLinkHref(a.Val, bookID, assetBase, spineIndex)
 				} else {
 					// e.g. SVG <image xlink:href="...">
 					a.Val = rewriteAssetRef(a.Val, bookID, assetBase)
 				}
 			}
 			attrs = append(attrs, a)
 		}
 		n.Attr = attrs
 	}
 	for c := n.FirstChild; c != nil; {
 		next := c.NextSibling
 		sanitizeNode(c, bookID, assetBase, spineIndex)
 		c = next
 	}
 }
 func rewriteAssetRef(raw, bookID, assetBase string) string {
 	raw = strings.TrimSpace(raw)
 	if raw == "" {
 		return raw
 	}
 	lower := strings.ToLower(raw)
 	if strings.HasPrefix(lower, "javascript:") {
 		return ""
 	}
 	if strings.HasPrefix(raw, "data:") || strings.Contains(raw, "://") || strings.HasPrefix(raw, "//") {
 		return raw
 	}
 	cleaned := cleanEPUBPath(assetBase, raw)
 	if cleaned == "" {
 		return ""
 	}
 	return "/read/" + bookID + "/asset/" + encodeAssetPath(cleaned)
 }
 func rewriteLinkHref(raw, bookID, assetBase string, spineIndex map[string]int) string {
 	raw = strings.TrimSpace(raw)
 	if raw == "" {
 		return raw
 	}
 	lower := strings.ToLower(raw)
 	if strings.HasPrefix(lower, "javascript:") {
 		return "#"
 	}
 	if strings.HasPrefix(raw, "#") {
 		return raw // same-page anchor
 	}
 	if strings.Contains(raw, "://") || strings.HasPrefix(raw, "//") || strings.HasPrefix(lower, "mailto:") {
 		return raw // external link
 	}
 	target, fragment := raw, ""
 	if i := strings.IndexByte(raw, '#'); i >= 0 {
 		target, fragment = raw[:i], raw[i:]
 	}
 	if target == "" {
 		return raw
 	}
 	cleaned := cleanEPUBPath(assetBase, target)
 	if cleaned == "" {
 		return "#"
 	}
 	if idx, ok := spineIndex[cleaned]; ok {
 		return fmt.Sprintf("/read/%s/%d%s", bookID, idx, fragment)
 	}
 	return "#" // unresolved internal reference (e.g. footnote in a non-spine doc)
 }
 func encodeAssetPath(p string) string {
 	segments := strings.Split(p, "/")
 	for i, seg := range segments {
 		segments[i] = url.PathEscape(seg)
 	}
 	return strings.Join(segments, "/")
 }
@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
 	"github.com/a-h/templ"
@@ -41,6 +42,8 @@ func (h *Handler) RegisterRoutes(mux *http.ServeMux) {
 	mux.HandleFunc("GET /book/{id}", h.requireAuth(h.bookDetails))
 	mux.HandleFunc("GET /download/{id}", h.requireAuth(h.downloadBook))
 	mux.HandleFunc("GET /cover/{id}", h.requireAuth(h.bookCover))
 	mux.HandleFunc("GET /read/{id}/asset/{path...}", h.requireAuth(h.readAsset))
 	mux.HandleFunc("GET /read/{id}/{idx}", h.requireAuth(h.readChapter))
 	// Uploader and above
 	mux.HandleFunc("GET /upload", h.requireRole(users.RoleUploader, h.uploadPage))
@@ -131,6 +134,69 @@ func (h *Handler) bookCover(w http.ResponseWriter, r *http.Request) {
 	_, _ = w.Write(data)
 }
 func (h *Handler) readChapter(w http.ResponseWriter, r *http.Request) {
 	id := r.PathValue("id")
 	if id == "" {
 		http.NotFound(w, r)
 		return
 	}
 	idx, err := strconv.Atoi(r.PathValue("idx"))
 	if err != nil || idx < 0 {
 		http.NotFound(w, r)
 		return
 	}
 	book, err := h.lib.FindBook(id)
 	if err != nil {
 		http.Error(w, "failed to load book", http.StatusInternalServerError)
 		return
 	}
 	if book == nil {
 		http.NotFound(w, r)
 		return
 	}
 	chapter, err := h.lib.ReadChapter(id, idx)
 	if err != nil {
 		if errors.Is(err, library.ErrChapterNotFound) {
 			http.NotFound(w, r)
 			return
 		}
 		log.Printf("read chapter: %v", err)
 		http.Error(w, "Kapitel konnte nicht geladen werden", http.StatusInternalServerError)
 		return
 	}
 	render(w, r.Context(), views.ReaderPage(*book, *chapter))
 }
 func (h *Handler) readAsset(w http.ResponseWriter, r *http.Request) {
 	id := r.PathValue("id")
 	assetPath := r.PathValue("path")
 	if id == "" || assetPath == "" {
 		http.NotFound(w, r)
 		return
 	}
 	data, contentType, err := h.lib.ChapterAsset(id, assetPath)
 	if err != nil {
 		log.Printf("read asset: %v", err)
 		http.Error(w, "Datei konnte nicht geladen werden", http.StatusInternalServerError)
 		return
 	}
 	if len(data) == 0 {
 		http.NotFound(w, r)
 		return
 	}
 	if contentType == "" {
 		contentType = "application/octet-stream"
 	}
 	w.Header().Set("Content-Type", contentType)
 	w.Header().Set("Cache-Control", "public, max-age=3600")
 	_, _ = w.Write(data)
 }
 func render(w http.ResponseWriter, ctx context.Context, c templ.Component) {
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
 	if err := c.Render(ctx, w); err != nil && !errors.Is(err, context.Canceled) {
@@ -203,6 +203,54 @@ h2 {
  color: inherit;
 }
 .btn + .btn {
  margin-left: 0.5rem;
 }
 .reader {
  display: block;
 }
 .reader-progress {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
 }
 .reader-chapter-title {
  margin-top: 0;
 }
 .reader-content {
  line-height: 1.6;
  overflow-wrap: break-word;
 }
 .reader-content img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0.5rem auto;
 }
 .reader-content p {
  margin: 0 0 1rem;
 }
 .reader-nav {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 1.5rem;
 }
 .reader-nav .btn + .btn {
  margin-left: 0;
 }
 .reader-nav-next {
  margin-left: auto;
 }
 .btn {
  display: inline-flex;
  align-items: center;
@@ -1,6 +1,7 @@
 package views
 import (
  "fmt"
  "strings"
  "github.com/arnef/ebooks/internal/library"
 )
@@ -145,12 +146,37 @@ templ BookPage(book library.Book) {
            <dd>{ book.Format }</dd>
          </div>
        </dl>
-        <p><a class="btn" href={ "/download/" + book.ID }>Auf Tolino herunterladen</a></p>
+        <p>
          <a class="btn" href={ "/read/" + book.ID + "/0" }>Im Browser lesen</a>
          <a class="btn" href={ "/download/" + book.ID }>Auf Tolino herunterladen</a>
        </p>
      </div>
    </article>
  }
 }
 templ ReaderPage(book library.Book, chapter library.Chapter) {
  @Layout(book.Title, "/book/" + book.ID) {
    <article class="reader">
      <p class="reader-progress">{ fmt.Sprintf("Kapitel %d von %d", chapter.Index+1, chapter.Total) }</p>
      if chapter.Title != "" {
        <h2 class="reader-chapter-title">{ chapter.Title }</h2>
      }
      <div class="reader-content">
        @templ.Raw(chapter.HTML)
      </div>
      <nav class="reader-nav">
        if chapter.HasPrev {
          <a class="btn reader-nav-prev" href={ fmt.Sprintf("/read/%s/%d", book.ID, chapter.PrevIndex) }>← Zurück</a>
        }
        if chapter.HasNext {
          <a class="btn reader-nav-next" href={ fmt.Sprintf("/read/%s/%d", book.ID, chapter.NextIndex) }>Weiter →</a>
        }
      </nav>
    </article>
  }
 }
 func coverClass(detail bool) string {
  if detail {
    return "book-cover book-cover-detail"
@@ -9,6 +9,7 @@ import "github.com/a-h/templ"
 import templruntime "github.com/a-h/templ/runtime"
 import (
 	"fmt"
 	"github.com/arnef/ebooks/internal/library"
 	"strings"
 )
@@ -41,7 +42,7 @@ func Layout(title string, backHref string) templ.Component {
 		var templ_7745c5c3_Var2 string
 		templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.JoinStringErrs(title)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 14, Col: 18}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 15, Col: 18}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var2))
 		if templ_7745c5c3_Err != nil {
@@ -59,7 +60,7 @@ func Layout(title string, backHref string) templ.Component {
 			var templ_7745c5c3_Var3 templ.SafeURL
 			templ_7745c5c3_Var3, templ_7745c5c3_Err = templ.JoinURLErrs(backHref)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 21, Col: 48}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 22, Col: 48}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var3))
 			if templ_7745c5c3_Err != nil {
@@ -114,7 +115,7 @@ func LoginLayout(title string) templ.Component {
 		var templ_7745c5c3_Var5 string
 		templ_7745c5c3_Var5, templ_7745c5c3_Err = templ.JoinStringErrs(title)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 42, Col: 18}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 43, Col: 18}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var5))
 		if templ_7745c5c3_Err != nil {
@@ -181,7 +182,7 @@ func LoginPage(errMsg string) templ.Component {
 				var templ_7745c5c3_Var8 string
 				templ_7745c5c3_Var8, templ_7745c5c3_Err = templ.JoinStringErrs(errMsg)
 				if templ_7745c5c3_Err != nil {
-					return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 58, Col: 33}
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 59, Col: 33}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var8))
 				if templ_7745c5c3_Err != nil {
@@ -251,7 +252,7 @@ func UploadPage(errMsg string) templ.Component {
 				var templ_7745c5c3_Var11 string
 				templ_7745c5c3_Var11, templ_7745c5c3_Err = templ.JoinStringErrs(errMsg)
 				if templ_7745c5c3_Err != nil {
-					return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 77, Col: 31}
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 78, Col: 31}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var11))
 				if templ_7745c5c3_Err != nil {
@@ -323,7 +324,7 @@ func BookCover(book library.Book, detail bool) templ.Component {
 			var templ_7745c5c3_Var15 string
 			templ_7745c5c3_Var15, templ_7745c5c3_Err = templ.ResolveAttributeValue("/cover/" + book.ID)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 89, Col: 63}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 90, Col: 63}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var15)
 			if templ_7745c5c3_Err != nil {
@@ -336,7 +337,7 @@ func BookCover(book library.Book, detail bool) templ.Component {
 			var templ_7745c5c3_Var16 string
 			templ_7745c5c3_Var16, templ_7745c5c3_Err = templ.ResolveAttributeValue("Cover von " + book.Title)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 89, Col: 97}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 90, Col: 97}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var16)
 			if templ_7745c5c3_Err != nil {
@@ -372,7 +373,7 @@ func BookCover(book library.Book, detail bool) templ.Component {
 			var templ_7745c5c3_Var19 string
 			templ_7745c5c3_Var19, templ_7745c5c3_Err = templ.JoinStringErrs(strings.ToUpper(book.Format))
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 92, Col: 42}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 93, Col: 42}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var19))
 			if templ_7745c5c3_Err != nil {
@@ -452,7 +453,7 @@ func IndexPage(books []library.Book, canUpload bool) templ.Component {
 					var templ_7745c5c3_Var22 templ.SafeURL
 					templ_7745c5c3_Var22, templ_7745c5c3_Err = templ.JoinURLErrs("/book/" + b.ID)
 					if templ_7745c5c3_Err != nil {
-						return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 112, Col: 55}
+						return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 113, Col: 55}
 					}
 					_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var22))
 					if templ_7745c5c3_Err != nil {
@@ -473,7 +474,7 @@ func IndexPage(books []library.Book, canUpload bool) templ.Component {
 					var templ_7745c5c3_Var23 string
 					templ_7745c5c3_Var23, templ_7745c5c3_Err = templ.ResolveAttributeValue(b.Title)
 					if templ_7745c5c3_Err != nil {
-						return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 117, Col: 58}
+						return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 118, Col: 58}
 					}
 					_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var23)
 					if templ_7745c5c3_Err != nil {
@@ -486,7 +487,7 @@ func IndexPage(books []library.Book, canUpload bool) templ.Component {
 					var templ_7745c5c3_Var24 string
 					templ_7745c5c3_Var24, templ_7745c5c3_Err = templ.JoinStringErrs(truncateTitle(b.Title, 60))
 					if templ_7745c5c3_Err != nil {
-						return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 117, Col: 89}
+						return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 118, Col: 89}
 					}
 					_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var24))
 					if templ_7745c5c3_Err != nil {
@@ -499,7 +500,7 @@ func IndexPage(books []library.Book, canUpload bool) templ.Component {
 					var templ_7745c5c3_Var25 string
 					templ_7745c5c3_Var25, templ_7745c5c3_Err = templ.JoinStringErrs(truncateTitle(b.Author, 40))
 					if templ_7745c5c3_Err != nil {
-						return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 118, Col: 71}
+						return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 119, Col: 71}
 					}
 					_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var25))
 					if templ_7745c5c3_Err != nil {
@@ -512,7 +513,7 @@ func IndexPage(books []library.Book, canUpload bool) templ.Component {
 					var templ_7745c5c3_Var26 string
 					templ_7745c5c3_Var26, templ_7745c5c3_Err = templ.JoinStringErrs(b.Format)
 					if templ_7745c5c3_Err != nil {
-						return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 119, Col: 47}
+						return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 120, Col: 47}
 					}
 					_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var26))
 					if templ_7745c5c3_Err != nil {
@@ -586,7 +587,7 @@ func BookPage(book library.Book) templ.Component {
 			var templ_7745c5c3_Var29 string
 			templ_7745c5c3_Var29, templ_7745c5c3_Err = templ.JoinStringErrs(book.Title)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 136, Col: 24}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 137, Col: 24}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var29))
 			if templ_7745c5c3_Err != nil {
@@ -599,7 +600,7 @@ func BookPage(book library.Book) templ.Component {
 			var templ_7745c5c3_Var30 string
 			templ_7745c5c3_Var30, templ_7745c5c3_Err = templ.JoinStringErrs(book.Author)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 137, Col: 51}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 138, Col: 51}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var30))
 			if templ_7745c5c3_Err != nil {
@@ -612,7 +613,7 @@ func BookPage(book library.Book) templ.Component {
 			var templ_7745c5c3_Var31 string
 			templ_7745c5c3_Var31, templ_7745c5c3_Err = templ.JoinStringErrs(book.Filename)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 141, Col: 31}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 142, Col: 31}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var31))
 			if templ_7745c5c3_Err != nil {
@@ -625,7 +626,7 @@ func BookPage(book library.Book) templ.Component {
 			var templ_7745c5c3_Var32 string
 			templ_7745c5c3_Var32, templ_7745c5c3_Err = templ.JoinStringErrs(book.Format)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 145, Col: 29}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 146, Col: 29}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var32))
 			if templ_7745c5c3_Err != nil {
@@ -636,15 +637,28 @@ func BookPage(book library.Book) templ.Component {
 				return templ_7745c5c3_Err
 			}
 			var templ_7745c5c3_Var33 templ.SafeURL
-			templ_7745c5c3_Var33, templ_7745c5c3_Err = templ.JoinURLErrs("/download/" + book.ID)
+			templ_7745c5c3_Var33, templ_7745c5c3_Err = templ.JoinURLErrs("/read/" + book.ID + "/0")
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 148, Col: 55}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 150, Col: 57}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var33))
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
-			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 44, "\">Auf Tolino herunterladen</a></p></div></article>")
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 44, "\">Im Browser lesen</a> <a class=\"btn\" href=\"")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
 			var templ_7745c5c3_Var34 templ.SafeURL
 			templ_7745c5c3_Var34, templ_7745c5c3_Err = templ.JoinURLErrs("/download/" + book.ID)
 			if templ_7745c5c3_Err != nil {
 				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 151, Col: 54}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var34))
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
 			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 45, "\">Auf Tolino herunterladen</a></p></div></article>")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
@@ -658,6 +672,139 @@ func BookPage(book library.Book) templ.Component {
 	})
 }
 func ReaderPage(book library.Book, chapter library.Chapter) templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
 			return templ_7745c5c3_CtxErr
 		}
 		templ_7745c5c3_Buffer, templ_7745c5c3_IsBuffer := templruntime.GetBuffer(templ_7745c5c3_W)
 		if !templ_7745c5c3_IsBuffer {
 			defer func() {
 				templ_7745c5c3_BufErr := templruntime.ReleaseBuffer(templ_7745c5c3_Buffer)
 				if templ_7745c5c3_Err == nil {
 					templ_7745c5c3_Err = templ_7745c5c3_BufErr
 				}
 			}()
 		}
 		ctx = templ.InitializeContext(ctx)
 		templ_7745c5c3_Var35 := templ.GetChildren(ctx)
 		if templ_7745c5c3_Var35 == nil {
 			templ_7745c5c3_Var35 = templ.NopComponent
 		}
 		ctx = templ.ClearChildren(ctx)
 		templ_7745c5c3_Var36 := templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 			templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 			templ_7745c5c3_Buffer, templ_7745c5c3_IsBuffer := templruntime.GetBuffer(templ_7745c5c3_W)
 			if !templ_7745c5c3_IsBuffer {
 				defer func() {
 					templ_7745c5c3_BufErr := templruntime.ReleaseBuffer(templ_7745c5c3_Buffer)
 					if templ_7745c5c3_Err == nil {
 						templ_7745c5c3_Err = templ_7745c5c3_BufErr
 					}
 				}()
 			}
 			ctx = templ.InitializeContext(ctx)
 			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 46, "<article class=\"reader\"><p class=\"reader-progress\">")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
 			var templ_7745c5c3_Var37 string
 			templ_7745c5c3_Var37, templ_7745c5c3_Err = templ.JoinStringErrs(fmt.Sprintf("Kapitel %d von %d", chapter.Index+1, chapter.Total))
 			if templ_7745c5c3_Err != nil {
 				return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 161, Col: 99}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var37))
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
 			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 47, "</p>")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
 			if chapter.Title != "" {
 				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 48, "<h2 class=\"reader-chapter-title\">")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
 				var templ_7745c5c3_Var38 string
 				templ_7745c5c3_Var38, templ_7745c5c3_Err = templ.JoinStringErrs(chapter.Title)
 				if templ_7745c5c3_Err != nil {
 					return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 163, Col: 56}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var38))
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
 				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 49, "</h2>")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
 			}
 			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 50, "<div class=\"reader-content\">")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
 			templ_7745c5c3_Err = templ.Raw(chapter.HTML).Render(ctx, templ_7745c5c3_Buffer)
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
 			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 51, "</div><nav class=\"reader-nav\">")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
 			if chapter.HasPrev {
 				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 52, "<a class=\"btn reader-nav-prev\" href=\"")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
 				var templ_7745c5c3_Var39 templ.SafeURL
 				templ_7745c5c3_Var39, templ_7745c5c3_Err = templ.JoinURLErrs(fmt.Sprintf("/read/%s/%d", book.ID, chapter.PrevIndex))
 				if templ_7745c5c3_Err != nil {
 					return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 170, Col: 102}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var39))
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
 				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 53, "\">← Zurück</a> ")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
 			}
 			if chapter.HasNext {
 				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 54, "<a class=\"btn reader-nav-next\" href=\"")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
 				var templ_7745c5c3_Var40 templ.SafeURL
 				templ_7745c5c3_Var40, templ_7745c5c3_Err = templ.JoinURLErrs(fmt.Sprintf("/read/%s/%d", book.ID, chapter.NextIndex))
 				if templ_7745c5c3_Err != nil {
 					return templ.Error{Err: templ_7745c5c3_Err, FileName: `views/pages.templ`, Line: 173, Col: 102}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var40))
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
 				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 55, "\">Weiter →</a>")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
 			}
 			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 56, "</nav></article>")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
 			return nil
 		})
 		templ_7745c5c3_Err = Layout(book.Title, "/book/"+book.ID).Render(templ.WithChildren(ctx, templ_7745c5c3_Var36), templ_7745c5c3_Buffer)
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
 		return nil
 	})
 }
 func coverClass(detail bool) string {
 	if detail {
 		return "book-cover book-cover-detail"