generated from dellevin/template
1163 lines
47 KiB
JavaScript
1163 lines
47 KiB
JavaScript
import * as CFI from './epubcfi.js'
|
|
|
|
const NS = {
|
|
CONTAINER: 'urn:oasis:names:tc:opendocument:xmlns:container',
|
|
XHTML: 'http://www.w3.org/1999/xhtml',
|
|
OPF: 'http://www.idpf.org/2007/opf',
|
|
EPUB: 'http://www.idpf.org/2007/ops',
|
|
DC: 'http://purl.org/dc/elements/1.1/',
|
|
DCTERMS: 'http://purl.org/dc/terms/',
|
|
ENC: 'http://www.w3.org/2001/04/xmlenc#',
|
|
NCX: 'http://www.daisy.org/z3986/2005/ncx/',
|
|
XLINK: 'http://www.w3.org/1999/xlink',
|
|
SMIL: 'http://www.w3.org/ns/SMIL',
|
|
}
|
|
|
|
const MIME = {
|
|
XML: 'application/xml',
|
|
NCX: 'application/x-dtbncx+xml',
|
|
XHTML: 'application/xhtml+xml',
|
|
HTML: 'text/html',
|
|
CSS: 'text/css',
|
|
SVG: 'image/svg+xml',
|
|
JS: /\/(x-)?(javascript|ecmascript)/,
|
|
}
|
|
|
|
// convert to camel case
|
|
const camel = x => x.toLowerCase().replace(/[-:](.)/g, (_, g) => g.toUpperCase())
|
|
|
|
// strip and collapse ASCII whitespace
|
|
// https://infra.spec.whatwg.org/#strip-and-collapse-ascii-whitespace
|
|
const normalizeWhitespace = str => str ? str
|
|
.replace(/[\t\n\f\r ]+/g, ' ')
|
|
.replace(/^[\t\n\f\r ]+/, '')
|
|
.replace(/[\t\n\f\r ]+$/, '') : ''
|
|
|
|
const filterAttribute = (attr, value, isList) => isList
|
|
? el => el.getAttribute(attr)?.split(/\s/)?.includes(value)
|
|
: typeof value === 'function'
|
|
? el => value(el.getAttribute(attr))
|
|
: el => el.getAttribute(attr) === value
|
|
|
|
const getAttributes = (...xs) => el =>
|
|
el ? Object.fromEntries(xs.map(x => [camel(x), el.getAttribute(x)])) : null
|
|
|
|
const getElementText = el => normalizeWhitespace(el?.textContent)
|
|
|
|
const childGetter = (doc, ns) => {
|
|
// ignore the namespace if it doesn't appear in document at all
|
|
const useNS = doc.lookupNamespaceURI(null) === ns || doc.lookupPrefix(ns)
|
|
const f = useNS
|
|
? (el, name) => el => el.namespaceURI === ns && el.localName === name
|
|
: (el, name) => el => el.localName === name
|
|
return {
|
|
$: (el, name) => [...el.children].find(f(el, name)),
|
|
$$: (el, name) => [...el.children].filter(f(el, name)),
|
|
$$$: useNS
|
|
? (el, name) => [...el.getElementsByTagNameNS(ns, name)]
|
|
: (el, name) => [...el.getElementsByTagName(name)],
|
|
}
|
|
}
|
|
|
|
const resolveURL = (url, relativeTo) => {
|
|
try {
|
|
// some tools (e.g., calibre) percent-encode punctuation we expect to be raw
|
|
url = url.replace(/%2c/gi, ',').replace(/%3a/gi, ':')
|
|
if (relativeTo.includes(':') && !relativeTo.startsWith('OEBPS'))
|
|
return new URL(url, relativeTo)
|
|
// the base needs to be a valid URL, so set a base URL and then remove it
|
|
const root = 'https://invalid.invalid/'
|
|
const obj = new URL(url, root + relativeTo)
|
|
obj.search = ''
|
|
return decodeURI(obj.href.replace(root, ''))
|
|
} catch (e) {
|
|
console.warn(e)
|
|
return url
|
|
}
|
|
}
|
|
|
|
const isExternal = uri => /^(?!blob)\w+:/i.test(uri)
|
|
|
|
// like `path.relative()` in Node.js
|
|
const pathRelative = (from, to) => {
|
|
if (!from) return to
|
|
const as = from.replace(/\/$/, '').split('/')
|
|
const bs = to.replace(/\/$/, '').split('/')
|
|
const i = (as.length > bs.length ? as : bs).findIndex((_, i) => as[i] !== bs[i])
|
|
return i < 0 ? '' : Array(as.length - i).fill('..').concat(bs.slice(i)).join('/')
|
|
}
|
|
|
|
const pathDirname = str => str.slice(0, str.lastIndexOf('/') + 1)
|
|
|
|
// replace asynchronously and sequentially
|
|
// same techinque as https://stackoverflow.com/a/48032528
|
|
const replaceSeries = async (str, regex, f) => {
|
|
const matches = []
|
|
str.replace(regex, (...args) => (matches.push(args), null))
|
|
const results = []
|
|
for (const args of matches) results.push(await f(...args))
|
|
return str.replace(regex, () => results.shift())
|
|
}
|
|
|
|
const regexEscape = str => str.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&')
|
|
|
|
const LANGS = { attrs: ['dir', 'xml:lang'] }
|
|
const ALTS = { name: 'alternate-script', many: true, ...LANGS, props: ['file-as'] }
|
|
const CONTRIB = {
|
|
many: true, ...LANGS,
|
|
props: [{ name: 'role', many: true, attrs: ['scheme'] }, 'file-as', ALTS],
|
|
setLegacyAttrs: (obj, el) => {
|
|
if (!obj.role?.length) {
|
|
const value = el.getAttributeNS(NS.OPF, 'role')
|
|
if (value) obj.role = [{ value }]
|
|
}
|
|
obj.fileAs ??= el.getAttributeNS(NS.OPF, 'file-as')
|
|
},
|
|
}
|
|
const METADATA = [
|
|
{
|
|
name: 'title', many: true, ...LANGS,
|
|
props: ['title-type', 'display-seq', 'file-as', ALTS],
|
|
},
|
|
{
|
|
name: 'identifier', many: true,
|
|
props: [{ name: 'identifier-type', attrs: ['scheme'] }],
|
|
setLegacyAttrs: (obj, el) => {
|
|
if (!obj.identifierType) {
|
|
const value = el.getAttributeNS(NS.OPF, 'scheme')
|
|
if (value) obj.identifierType = { value }
|
|
}
|
|
},
|
|
},
|
|
{ name: 'language', many: true },
|
|
{ name: 'creator', ...CONTRIB },
|
|
{ name: 'contributor', ...CONTRIB },
|
|
{ name: 'publisher', ...LANGS, props: ['file-as', ALTS] },
|
|
{ name: 'description', ...LANGS, props: [ALTS] },
|
|
{ name: 'rights', ...LANGS, props: [ALTS] },
|
|
{ name: 'date' },
|
|
{ name: 'dcterms:modified', type: 'meta' },
|
|
{
|
|
name: 'subject', many: true, ...LANGS, props: ['term', 'authority', ALTS],
|
|
setLegacyAttrs: (obj, el) => {
|
|
obj.term ??= el.getAttributeNS(NS.OPF, 'term')
|
|
obj.authority ??= el.getAttributeNS(NS.OPF, 'authority')
|
|
},
|
|
},
|
|
{ name: 'source', many: true },
|
|
{
|
|
name: 'belongs-to-collection', type: 'meta', many: true, ...LANGS,
|
|
props: [
|
|
'collection-type', 'group-position', 'dcterms:identifier', 'file-as',
|
|
ALTS, { name: 'belongs-to-collection', recursive: true },
|
|
],
|
|
},
|
|
]
|
|
|
|
const getMetadata = opf => {
|
|
const { $, $$ } = childGetter(opf, NS.OPF)
|
|
const $metadata = $(opf.documentElement, 'metadata')
|
|
const els = Array.from($metadata.children)
|
|
const getValue = (obj, el) => {
|
|
if (!el) return null
|
|
const { props = [], attrs = [] } = obj
|
|
const value = getElementText(el)
|
|
if (!props.length && !attrs.length) return value
|
|
const id = el.getAttribute('id')
|
|
const refines = id ? els.filter(filterAttribute('refines', '#' + id)) : []
|
|
const result = Object.fromEntries([['value', value]]
|
|
.concat(props.map(prop => {
|
|
const { many, recursive } = prop
|
|
const name = typeof prop === 'string' ? prop : prop.name
|
|
const filter = filterAttribute('property', name)
|
|
const subobj = recursive ? obj : prop
|
|
return [camel(name), many
|
|
? refines.filter(filter).map(el => getValue(subobj, el))
|
|
: getValue(subobj, refines.find(filter))]
|
|
}))
|
|
.concat(attrs.map(attr => [camel(attr), el.getAttribute(attr)])))
|
|
obj.setLegacyAttrs?.(result, el)
|
|
return result
|
|
}
|
|
const arr = els.filter(filterAttribute('refines', null))
|
|
const metadata = Object.fromEntries(METADATA.map(obj => {
|
|
const { type, name, many } = obj
|
|
const filter = type === 'meta'
|
|
? el => el.namespaceURI === NS.OPF && el.getAttribute('property') === name
|
|
: el => el.namespaceURI === NS.DC && el.localName === name
|
|
return [camel(name), many ? arr.filter(filter).map(el => getValue(obj, el))
|
|
: getValue(obj, arr.find(filter))]
|
|
}))
|
|
|
|
const $$meta = $$($metadata, 'meta')
|
|
const getMetasByPrefix = prefix => $$meta
|
|
.filter(filterAttribute('property', x => x?.startsWith(prefix)))
|
|
.map(el => [el.getAttribute('property').replace(prefix, ''), el])
|
|
|
|
const rendition = Object.fromEntries(getMetasByPrefix('rendition:')
|
|
.map(([k, el]) => [k, getElementText(el)]))
|
|
|
|
const media = { narrator: [], duration: {} }
|
|
for (const [k, el] of getMetasByPrefix('media:')) {
|
|
const v = getElementText(el)
|
|
if (k === 'duration') media.duration[
|
|
el.getAttribute('refines')?.split('#')?.[1] ?? ''] = parseClock(v)
|
|
else if (k === 'active-class') media.activeClass = v
|
|
else if (k === 'narrator') media.narrator.push(v)
|
|
else if (k === 'playback-active-class') media.playbackActiveClass = v
|
|
}
|
|
return { metadata, rendition, media }
|
|
}
|
|
|
|
const parseNav = (doc, resolve = f => f) => {
|
|
const { $, $$, $$$ } = childGetter(doc, NS.XHTML)
|
|
const resolveHref = href => href ? decodeURI(resolve(href)) : null
|
|
const parseLI = getType => $li => {
|
|
const $a = $($li, 'a') ?? $($li, 'span')
|
|
const $ol = $($li, 'ol')
|
|
const href = resolveHref($a?.getAttribute('href'))
|
|
const label = getElementText($a) || $a?.getAttribute('title')
|
|
// TODO: get and concat alt/title texts in content
|
|
const result = { label, href, subitems: parseOL($ol) }
|
|
if (getType) result.type = $a?.getAttributeNS(NS.EPUB, 'type')?.split(/\s/)
|
|
return result
|
|
}
|
|
const parseOL = ($ol, getType) => $ol ? $$($ol, 'li').map(parseLI(getType)) : null
|
|
const parseNav = ($nav, getType) => parseOL($($nav, 'ol'), getType)
|
|
|
|
const $$nav = $$$(doc, 'nav')
|
|
let toc = null, pageList = null, landmarks = null, others = []
|
|
for (const $nav of $$nav) {
|
|
const type = $nav.getAttributeNS(NS.EPUB, 'type')?.split(/\s/) ?? []
|
|
if (type.includes('toc')) toc ??= parseNav($nav)
|
|
else if (type.includes('page-list')) pageList ??= parseNav($nav)
|
|
else if (type.includes('landmarks')) landmarks ??= parseNav($nav, true)
|
|
else others.push({
|
|
label: getElementText($nav.firstElementChild), type,
|
|
list: parseNav($nav),
|
|
})
|
|
}
|
|
return { toc, pageList, landmarks, others }
|
|
}
|
|
|
|
const parseNCX = (doc, resolve = f => f) => {
|
|
const { $, $$ } = childGetter(doc, NS.NCX)
|
|
const resolveHref = href => href ? decodeURI(resolve(href)) : null
|
|
const parseItem = el => {
|
|
const $label = $(el, 'navLabel')
|
|
const $content = $(el, 'content')
|
|
const label = getElementText($label)
|
|
const href = resolveHref($content.getAttribute('src'))
|
|
if (el.localName === 'navPoint') {
|
|
const els = $$(el, 'navPoint')
|
|
return { label, href, subitems: els.length ? els.map(parseItem) : null }
|
|
}
|
|
return { label, href }
|
|
}
|
|
const parseList = (el, itemName) => $$(el, itemName).map(parseItem)
|
|
const getSingle = (container, itemName) => {
|
|
const $container = $(doc.documentElement, container)
|
|
return $container ? parseList($container, itemName) : null
|
|
}
|
|
return {
|
|
toc: getSingle('navMap', 'navPoint'),
|
|
pageList: getSingle('pageList', 'pageTarget'),
|
|
others: $$(doc.documentElement, 'navList').map(el => ({
|
|
label: getElementText($(el, 'navLabel')),
|
|
list: parseList(el, 'navTarget'),
|
|
})),
|
|
}
|
|
}
|
|
|
|
const parseClock = str => {
|
|
if (!str) return
|
|
const parts = str.split(':').map(x => parseFloat(x))
|
|
if (parts.length === 3) {
|
|
const [h, m, s] = parts
|
|
return h * 60 * 60 + m * 60 + s
|
|
}
|
|
if (parts.length === 2) {
|
|
const [m, s] = parts
|
|
return m * 60 + s
|
|
}
|
|
const [x, unit] = str.split(/(?=[^\d.])/)
|
|
const n = parseFloat(x)
|
|
const f = unit === 'h' ? 60 * 60
|
|
: unit === 'min' ? 60
|
|
: unit === 'ms' ? .001
|
|
: 1
|
|
return n * f
|
|
}
|
|
|
|
class MediaOverlay extends EventTarget {
|
|
#entries
|
|
#lastMediaOverlayItem
|
|
#sectionIndex
|
|
#audioIndex
|
|
#itemIndex
|
|
#audio
|
|
#volume = 1
|
|
#rate = 1
|
|
constructor(book, loadXML) {
|
|
super()
|
|
this.book = book
|
|
this.loadXML = loadXML
|
|
}
|
|
async #loadSMIL(item) {
|
|
if (this.#lastMediaOverlayItem === item) return
|
|
const doc = await this.loadXML(item.href)
|
|
const resolve = href => href ? resolveURL(href, item.href) : null
|
|
const { $, $$$ } = childGetter(doc, NS.SMIL)
|
|
this.#audioIndex = -1
|
|
this.#itemIndex = -1
|
|
this.#entries = $$$(doc, 'par').reduce((arr, $par) => {
|
|
const text = resolve($($par, 'text')?.getAttribute('src'))
|
|
const $audio = $($par, 'audio')
|
|
if (!text || !$audio) return arr
|
|
const src = resolve($audio.getAttribute('src'))
|
|
const begin = parseClock($audio.getAttribute('clipBegin'))
|
|
const end = parseClock($audio.getAttribute('clipEnd'))
|
|
const last = arr.at(-1)
|
|
if (last?.src === src) last.items.push({ text, begin, end })
|
|
else arr.push({ src, items: [{ text, begin, end }] })
|
|
return arr
|
|
}, [])
|
|
this.#lastMediaOverlayItem = item
|
|
}
|
|
get #activeAudio() {
|
|
return this.#entries[this.#audioIndex]
|
|
}
|
|
get #activeItem() {
|
|
return this.#activeAudio?.items?.[this.#itemIndex]
|
|
}
|
|
#error(e) {
|
|
console.error(e)
|
|
this.dispatchEvent(new CustomEvent('error', { detail: e }))
|
|
}
|
|
#highlight() {
|
|
this.dispatchEvent(new CustomEvent('highlight', { detail: this.#activeItem }))
|
|
}
|
|
#unhighlight() {
|
|
this.dispatchEvent(new CustomEvent('unhighlight', { detail: this.#activeItem }))
|
|
}
|
|
async #play(audioIndex, itemIndex) {
|
|
if (this.#audio) {
|
|
this.#audio.pause()
|
|
URL.revokeObjectURL(this.#audio.src)
|
|
this.#audio = null
|
|
}
|
|
this.#audioIndex = audioIndex
|
|
this.#itemIndex = itemIndex
|
|
const src = this.#activeAudio?.src
|
|
if (!src || !this.#activeItem) return this.start(this.#sectionIndex + 1)
|
|
|
|
const url = URL.createObjectURL(await this.book.loadBlob(src))
|
|
const audio = new Audio(url)
|
|
this.#audio = audio
|
|
audio.addEventListener('timeupdate', () => {
|
|
if (audio.paused) return
|
|
const t = audio.currentTime
|
|
const { items } = this.#activeAudio
|
|
if (t > this.#activeItem?.end) {
|
|
this.#unhighlight()
|
|
if (this.#itemIndex === items.length - 1) {
|
|
this.#play(this.#audioIndex + 1, 0).catch(e => this.#error(e))
|
|
return
|
|
}
|
|
}
|
|
const oldIndex = this.#itemIndex
|
|
while (items[this.#itemIndex + 1]?.begin <= t) this.#itemIndex++
|
|
if (this.#itemIndex !== oldIndex) this.#highlight()
|
|
})
|
|
audio.addEventListener('error', () =>
|
|
this.#error(new Error(`Failed to load ${src}`)))
|
|
audio.addEventListener('playing', () => this.#highlight())
|
|
audio.addEventListener('pause', () => this.#unhighlight())
|
|
audio.addEventListener('ended', () => {
|
|
this.#unhighlight()
|
|
URL.revokeObjectURL(url)
|
|
this.#audio = null
|
|
this.#play(audioIndex + 1, 0).catch(e => this.#error(e))
|
|
})
|
|
audio.addEventListener('canplaythrough', () => {
|
|
audio.currentTime = this.#activeItem.begin ?? 0
|
|
audio.volume = this.#volume
|
|
audio.playbackRate = this.#rate
|
|
audio.play().catch(e => this.#error(e))
|
|
})
|
|
}
|
|
async start(sectionIndex, filter = () => true) {
|
|
this.#audio?.pause()
|
|
const section = this.book.sections[sectionIndex]
|
|
const href = section?.id
|
|
if (!href) return
|
|
|
|
const { mediaOverlay } = section
|
|
if (!mediaOverlay) return this.start(sectionIndex + 1)
|
|
this.#sectionIndex = sectionIndex
|
|
await this.#loadSMIL(mediaOverlay)
|
|
|
|
for (let i = 0; i < this.#entries.length; i++) {
|
|
const { items } = this.#entries[i]
|
|
for (let j = 0; j < items.length; j++) {
|
|
if (items[j].text.split('#')[0] === href && filter(items[j], j, items))
|
|
return this.#play(i, j).catch(e => this.#error(e))
|
|
}
|
|
}
|
|
}
|
|
pause() {
|
|
this.#audio?.pause()
|
|
}
|
|
resume() {
|
|
this.#audio?.play().catch(e => this.#error(e))
|
|
}
|
|
prev() {
|
|
if (this.#itemIndex > 0) this.#play(this.#audioIndex, this.#itemIndex - 1)
|
|
else if (this.#audioIndex > 0) this.#play(this.#audioIndex - 1,
|
|
this.#entries[this.#audioIndex - 1].items.length - 1)
|
|
else if (this.#sectionIndex > 0)
|
|
this.start(this.#sectionIndex - 1, (_, i, items) => i === items.length - 1)
|
|
}
|
|
next() {
|
|
this.#play(this.#audioIndex, this.#itemIndex + 1)
|
|
}
|
|
setVolume(volume) {
|
|
this.#volume = volume
|
|
if (this.#audio) this.#audio.volume = volume
|
|
}
|
|
setRate(rate) {
|
|
this.#rate = rate
|
|
if (this.#audio) this.#audio.playbackRate = rate
|
|
}
|
|
}
|
|
|
|
const isUUID = /([0-9a-f]{8})-([0-9a-f]{4})-([0-9a-f]{4})-([0-9a-f]{4})-([0-9a-f]{12})/
|
|
|
|
const getUUID = opf => {
|
|
for (const el of opf.getElementsByTagNameNS(NS.DC, 'identifier')) {
|
|
const [id] = getElementText(el).split(':').slice(-1)
|
|
if (isUUID.test(id)) return id
|
|
}
|
|
return ''
|
|
}
|
|
|
|
const getIdentifier = opf => getElementText(
|
|
opf.getElementById(opf.documentElement.getAttribute('unique-identifier'))
|
|
?? opf.getElementsByTagNameNS(NS.DC, 'identifier')[0])
|
|
|
|
// https://www.w3.org/publishing/epub32/epub-ocf.html#sec-resource-obfuscation
|
|
const deobfuscate = async (key, length, blob) => {
|
|
const array = new Uint8Array(await blob.slice(0, length).arrayBuffer())
|
|
length = Math.min(length, array.length)
|
|
for (var i = 0; i < length; i++) array[i] = array[i] ^ key[i % key.length]
|
|
return new Blob([array, blob.slice(length)], { type: blob.type })
|
|
}
|
|
|
|
const WebCryptoSHA1 = async str => {
|
|
const data = new TextEncoder().encode(str)
|
|
const buffer = await globalThis.crypto.subtle.digest('SHA-1', data)
|
|
return new Uint8Array(buffer)
|
|
}
|
|
|
|
const deobfuscators = (sha1 = WebCryptoSHA1) => ({
|
|
'http://www.idpf.org/2008/embedding': {
|
|
key: opf => sha1(getIdentifier(opf)
|
|
// eslint-disable-next-line no-control-regex
|
|
.replaceAll(/[\u0020\u0009\u000d\u000a]/g, '')),
|
|
decode: (key, blob) => deobfuscate(key, 1040, blob),
|
|
},
|
|
'http://ns.adobe.com/pdf/enc#RC': {
|
|
key: opf => {
|
|
const uuid = getUUID(opf).replaceAll('-', '')
|
|
return Uint8Array.from({ length: 16 }, (_, i) =>
|
|
parseInt(uuid.slice(i * 2, i * 2 + 2), 16))
|
|
},
|
|
decode: (key, blob) => deobfuscate(key, 1024, blob),
|
|
},
|
|
})
|
|
|
|
class Encryption {
|
|
#uris = new Map()
|
|
#decoders = new Map()
|
|
#algorithms
|
|
constructor(algorithms) {
|
|
this.#algorithms = algorithms
|
|
}
|
|
async init(encryption, opf) {
|
|
if (!encryption) return
|
|
const data = Array.from(
|
|
encryption.getElementsByTagNameNS(NS.ENC, 'EncryptedData'), el => ({
|
|
algorithm: el.getElementsByTagNameNS(NS.ENC, 'EncryptionMethod')[0]
|
|
?.getAttribute('Algorithm'),
|
|
uri: el.getElementsByTagNameNS(NS.ENC, 'CipherReference')[0]
|
|
?.getAttribute('URI'),
|
|
}))
|
|
for (const { algorithm, uri } of data) {
|
|
if (!this.#decoders.has(algorithm)) {
|
|
const algo = this.#algorithms[algorithm]
|
|
if (!algo) {
|
|
console.warn('Unknown encryption algorithm')
|
|
continue
|
|
}
|
|
const key = await algo.key(opf)
|
|
this.#decoders.set(algorithm, blob => algo.decode(key, blob))
|
|
}
|
|
this.#uris.set(uri, algorithm)
|
|
}
|
|
}
|
|
getDecoder(uri) {
|
|
return this.#decoders.get(this.#uris.get(uri)) ?? (x => x)
|
|
}
|
|
}
|
|
|
|
class Resources {
|
|
constructor({ opf, resolveHref }) {
|
|
this.opf = opf
|
|
const { $, $$, $$$ } = childGetter(opf, NS.OPF)
|
|
|
|
const $manifest = $(opf.documentElement, 'manifest')
|
|
const $spine = $(opf.documentElement, 'spine')
|
|
const $$itemref = $$($spine, 'itemref')
|
|
|
|
this.manifest = $$($manifest, 'item')
|
|
.map(getAttributes('href', 'id', 'media-type', 'properties', 'media-overlay'))
|
|
.map(item => {
|
|
item.href = resolveHref(item.href)
|
|
item.properties = item.properties?.split(/\s/)
|
|
return item
|
|
})
|
|
this.spine = $$itemref
|
|
.map(getAttributes('idref', 'id', 'linear', 'properties'))
|
|
.map(item => (item.properties = item.properties?.split(/\s/), item))
|
|
this.pageProgressionDirection = $spine
|
|
.getAttribute('page-progression-direction')
|
|
|
|
this.navPath = this.getItemByProperty('nav')?.href
|
|
this.ncxPath = (this.getItemByID($spine.getAttribute('toc'))
|
|
?? this.manifest.find(item => item.mediaType === MIME.NCX))?.href
|
|
|
|
const $guide = $(opf.documentElement, 'guide')
|
|
if ($guide) this.guide = $$($guide, 'reference')
|
|
.map(getAttributes('type', 'title', 'href'))
|
|
.map(({ type, title, href }) => ({
|
|
label: title,
|
|
type: type.split(/\s/),
|
|
href: resolveHref(href),
|
|
}))
|
|
|
|
// Try to find cover image, store XHTML cover page separately
|
|
const coverCandidate = this.getItemByProperty('cover-image')
|
|
// EPUB 2 compat
|
|
?? this.getItemByID($$$(opf, 'meta')
|
|
.find(filterAttribute('name', 'cover'))
|
|
?.getAttribute('content'))
|
|
// Guide reference
|
|
?? this.getItemByHref(this.guide
|
|
?.find(ref => ref.type.includes('cover'))?.href)
|
|
// Common cover ID patterns (case-insensitive)
|
|
?? this.manifest.find(item =>
|
|
['cover', 'cover-image', 'coverimage'].includes(item.id?.toLowerCase())
|
|
&& item.mediaType?.startsWith('image/'))
|
|
// Cover in href (check multiple common patterns)
|
|
?? this.manifest.find(item => {
|
|
const href = item.href?.toLowerCase()
|
|
return href && item.mediaType?.startsWith('image/')
|
|
&& (href.includes('/cover.') || href.includes('/cover_')
|
|
|| href.endsWith('cover.jpg') || href.endsWith('cover.png')
|
|
|| href.endsWith('cover.jpeg') || href.endsWith('cover.gif'))
|
|
})
|
|
// Titlepage image (often contains cover)
|
|
?? this.manifest.find(item =>
|
|
item.id?.toLowerCase().includes('titlepage')
|
|
&& item.mediaType?.startsWith('image/'))
|
|
// Last resort: first image in manifest
|
|
?? this.manifest.find(item => item.mediaType?.startsWith('image/'))
|
|
|
|
// If cover is XHTML/HTML, store it separately for later parsing
|
|
if (coverCandidate?.mediaType?.includes('html')) {
|
|
this.coverPage = coverCandidate
|
|
this.cover = null
|
|
} else {
|
|
this.cover = coverCandidate
|
|
this.coverPage = null
|
|
}
|
|
|
|
this.cfis = CFI.fromElements($$itemref)
|
|
}
|
|
getItemByID(id) {
|
|
return this.manifest.find(item => item.id === id)
|
|
}
|
|
getItemByHref(href) {
|
|
return this.manifest.find(item => item.href === href)
|
|
}
|
|
getItemByProperty(prop) {
|
|
return this.manifest.find(item => item.properties?.includes(prop))
|
|
}
|
|
resolveCFI(cfi) {
|
|
const parts = CFI.parse(cfi)
|
|
const top = (parts.parent ?? parts).shift()
|
|
let $itemref = CFI.toElement(this.opf, top)
|
|
// make sure it's an idref; if not, try again without the ID assertion
|
|
// mainly because Epub.js used to generate wrong ID assertions
|
|
// https://github.com/futurepress/epub.js/issues/1236
|
|
if ($itemref && $itemref.nodeName !== 'idref') {
|
|
// top.at(-1).id = null
|
|
top[top.length - 1].id = null
|
|
$itemref = CFI.toElement(this.opf, top)
|
|
}
|
|
const idref = $itemref?.getAttribute('idref')
|
|
const index = this.spine.findIndex(item => item.idref === idref)
|
|
const anchor = doc => CFI.toRange(doc, parts)
|
|
return { index, anchor }
|
|
}
|
|
}
|
|
|
|
class Loader {
|
|
#cache = new Map()
|
|
#children = new Map()
|
|
#refCount = new Map()
|
|
eventTarget = new EventTarget()
|
|
allowScript = false
|
|
constructor({ loadText, loadBlob, resources }) {
|
|
this.loadText = loadText
|
|
this.loadBlob = loadBlob
|
|
this.manifest = resources.manifest
|
|
this.assets = resources.manifest
|
|
|
|
var urlParams = new URLSearchParams(window.location.search)
|
|
this.allowScript = JSON.parse(urlParams.get('style')).allowScript
|
|
|
|
// needed only when replacing in (X)HTML w/o parsing (see below)
|
|
//.filter(({ mediaType }) => ![MIME.XHTML, MIME.HTML].includes(mediaType))
|
|
}
|
|
async createURL(href, data, type, parent) {
|
|
if (!data) return ''
|
|
const detail = { name: href, data, type }
|
|
this.eventTarget.dispatchEvent(new CustomEvent('data', { detail }))
|
|
const resolvedData = await detail.data
|
|
const resolvedType = detail.type ?? type
|
|
const blob = resolvedData instanceof Blob
|
|
? resolvedData
|
|
: new Blob([resolvedData], { type: resolvedType })
|
|
detail.type = blob.type || resolvedType
|
|
detail.data = blob
|
|
const url = URL.createObjectURL(blob)
|
|
this.#cache.set(href, url)
|
|
this.#refCount.set(href, 1)
|
|
if (parent) {
|
|
const childList = this.#children.get(parent)
|
|
if (childList) childList.push(href)
|
|
else this.#children.set(parent, [href])
|
|
}
|
|
return url
|
|
}
|
|
ref(href, parent) {
|
|
const childList = this.#children.get(parent)
|
|
if (!childList?.includes(href)) {
|
|
this.#refCount.set(href, this.#refCount.get(href) + 1)
|
|
//console.log(`referencing ${href}, now ${this.#refCount.get(href)}`)
|
|
if (childList) childList.push(href)
|
|
else this.#children.set(parent, [href])
|
|
}
|
|
return this.#cache.get(href)
|
|
}
|
|
unref(href) {
|
|
if (!this.#refCount.has(href)) return
|
|
const count = this.#refCount.get(href) - 1
|
|
//console.log(`unreferencing ${href}, now ${count}`)
|
|
if (count < 1) {
|
|
//console.log(`unloading ${href}`)
|
|
URL.revokeObjectURL(this.#cache.get(href))
|
|
this.#cache.delete(href)
|
|
this.#refCount.delete(href)
|
|
// unref children
|
|
const childList = this.#children.get(href)
|
|
if (childList) while (childList.length) this.unref(childList.pop())
|
|
this.#children.delete(href)
|
|
} else this.#refCount.set(href, count)
|
|
}
|
|
// load manifest item, recursively loading all resources as needed
|
|
async loadItem(item, parents = []) {
|
|
if (!item) return null
|
|
const { href } = item
|
|
let mediaType = item.mediaType
|
|
let isScript = MIME.JS.test(mediaType)
|
|
let allow = !(isScript && !this.allowScript)
|
|
const detail = { name: href, type: mediaType, isScript, allow }
|
|
this.eventTarget.dispatchEvent(new CustomEvent('load', { detail }))
|
|
mediaType = detail.type ?? mediaType
|
|
isScript = detail.isScript ?? MIME.JS.test(mediaType)
|
|
allow = detail.allow ?? allow
|
|
if (!allow) return null
|
|
|
|
const parent = parents[parents.length - 1]
|
|
if (this.#cache.has(href)) return this.ref(href, parent)
|
|
|
|
const targetItem = mediaType === item.mediaType ? item : { ...item, mediaType }
|
|
const shouldReplace =
|
|
(isScript || [MIME.XHTML, MIME.HTML, MIME.CSS, MIME.SVG].includes(mediaType))
|
|
// prevent circular references
|
|
&& parents.every(p => p !== href)
|
|
if (shouldReplace) return this.loadReplaced(targetItem, parents)
|
|
const dataSource = detail.data ?? Promise.resolve().then(() => this.loadBlob(href))
|
|
return this.createURL(href, dataSource, mediaType, parent)
|
|
}
|
|
async loadHref(href, base, parents = []) {
|
|
if (isExternal(href)) return href
|
|
const path = resolveURL(href, base)
|
|
const item = this.manifest.find(item => item.href === path)
|
|
if (!item) {
|
|
// Fallback for non-standard EPUBs with missing manifest entries
|
|
// Try to load the resource directly if it exists
|
|
const parent = parents[parents.length - 1]
|
|
if (this.#cache.has(path)) return this.ref(path, parent)
|
|
try {
|
|
const blob = await this.loadBlob(path)
|
|
if (blob) {
|
|
// Infer media type from file extension
|
|
const ext = path.split('.').pop()?.toLowerCase()
|
|
const mediaType = ext === 'jpg' || ext === 'jpeg' ? 'image/jpeg'
|
|
: ext === 'png' ? 'image/png'
|
|
: ext === 'gif' ? 'image/gif'
|
|
: ext === 'svg' ? 'image/svg+xml'
|
|
: ext === 'webp' ? 'image/webp'
|
|
: ext === 'css' ? 'text/css'
|
|
: 'application/octet-stream'
|
|
return this.createURL(path, blob, mediaType, parent)
|
|
}
|
|
} catch (e) {
|
|
console.warn(`Failed to load resource not in manifest: ${path}`, e)
|
|
}
|
|
return href
|
|
}
|
|
return this.loadItem(item, parents.concat(base))
|
|
}
|
|
async loadReplaced(item, parents = []) {
|
|
const { href, mediaType } = item
|
|
// const parent = parents.at(-1)
|
|
const parent = parents[parents.length - 1]
|
|
const str = await this.loadText(href)
|
|
if (!str) return null
|
|
|
|
// note that one can also just use `replaceString` for everything:
|
|
// ```
|
|
// const replaced = await this.replaceString(str, href, parents)
|
|
// return this.createURL(href, replaced, mediaType, parent)
|
|
// ```
|
|
// which is basically what Epub.js does, which is simpler, but will
|
|
// break things like iframes (because you don't want to replace links)
|
|
// or text that just happen to be paths
|
|
|
|
// parse and replace in HTML
|
|
if ([MIME.XHTML, MIME.HTML, MIME.SVG].includes(mediaType)) {
|
|
let doc = new DOMParser().parseFromString(str, mediaType)
|
|
// change to HTML if it's not valid XHTML
|
|
if (mediaType === MIME.XHTML && (doc.querySelector('parsererror')
|
|
|| !doc.documentElement?.namespaceURI)) {
|
|
console.warn(doc.querySelector('parsererror')?.innerText ?? 'Invalid XHTML')
|
|
item.mediaType = MIME.HTML
|
|
doc = new DOMParser().parseFromString(str, item.mediaType)
|
|
}
|
|
// replace hrefs in XML processing instructions
|
|
// this is mainly for SVGs that use xml-stylesheet
|
|
if ([MIME.XHTML, MIME.SVG].includes(item.mediaType)) {
|
|
let child = doc.firstChild
|
|
while (child instanceof ProcessingInstruction) {
|
|
if (child.data) {
|
|
const replacedData = await replaceSeries(child.data,
|
|
/(?:^|\s*)(href\s*=\s*['"])([^'"]*)(['"])/i,
|
|
(_, p1, p2, p3) => this.loadHref(p2, href, parents)
|
|
.then(p2 => `${p1}${p2}${p3}`))
|
|
child.replaceWith(doc.createProcessingInstruction(
|
|
child.target, replacedData))
|
|
}
|
|
child = child.nextSibling
|
|
}
|
|
}
|
|
// replace hrefs (excluding anchors)
|
|
// TODO: srcset?
|
|
const replace = async (el, attr) => el.setAttribute(attr,
|
|
await this.loadHref(el.getAttribute(attr), href, parents))
|
|
for (const el of doc.querySelectorAll('link[href]')) await replace(el, 'href')
|
|
for (const el of doc.querySelectorAll('[src]')) await replace(el, 'src')
|
|
for (const el of doc.querySelectorAll('[poster]')) await replace(el, 'poster')
|
|
for (const el of doc.querySelectorAll('object[data]')) await replace(el, 'data')
|
|
for (const el of doc.querySelectorAll('[*|href]:not([href])'))
|
|
el.setAttributeNS(NS.XLINK, 'href', await this.loadHref(
|
|
el.getAttributeNS(NS.XLINK, 'href'), href, parents))
|
|
// replace inline styles
|
|
for (const el of doc.querySelectorAll('style'))
|
|
if (el.textContent) el.textContent =
|
|
await this.replaceCSS(el.textContent, href, parents)
|
|
for (const el of doc.querySelectorAll('[style]'))
|
|
el.setAttribute('style',
|
|
await this.replaceCSS(el.getAttribute('style'), href, parents))
|
|
// TODO: replace inline scripts? probably not worth the trouble
|
|
const result = new XMLSerializer().serializeToString(doc)
|
|
return this.createURL(href, result, item.mediaType, parent)
|
|
}
|
|
|
|
const result = mediaType === MIME.CSS
|
|
? await this.replaceCSS(str, href, parents)
|
|
: await this.replaceString(str, href, parents)
|
|
return this.createURL(href, result, mediaType, parent)
|
|
}
|
|
async replaceCSS(str, href, parents = []) {
|
|
const replacedUrls = await replaceSeries(str,
|
|
/url\(\s*["']?([^'"\n]*?)\s*["']?\s*\)/gi,
|
|
(_, url) => this.loadHref(url, href, parents)
|
|
.then(url => `url("${url}")`))
|
|
// apart from `url()`, strings can be used for `@import` (but why?!)
|
|
const replacedImports = await replaceSeries(replacedUrls,
|
|
/@import\s*["']([^"'\n]*?)["']/gi,
|
|
(_, url) => this.loadHref(url, href, parents)
|
|
.then(url => `@import "${url}"`))
|
|
const w = window?.innerWidth ?? 800
|
|
const h = window?.innerHeight ?? 600
|
|
return replacedImports
|
|
// unprefix as most of the props are (only) supported unprefixed
|
|
.replace(/([{\s;])-epub-/gi, '$1')
|
|
// replace vw and vh as they cause problems with layout
|
|
.replace(/(\d*\.?\d+)vw/gi, (_, d) => parseFloat(d) * w / 100 + 'px')
|
|
.replace(/(\d*\.?\d+)vh/gi, (_, d) => parseFloat(d) * h / 100 + 'px')
|
|
|
|
// This cause a bug on Safari, element with box-shadow inside a column
|
|
// get incorrectly clipped. So for now, we just remove it.
|
|
// // `page-break-*` unsupported in columns; replace with `column-break-*`
|
|
// .replace(/page-break-(after|before|inside)\s*:/gi, (_, x) =>
|
|
// `-webkit-column-break-${x}:`)
|
|
// .replace(/break-(after|before|inside)\s*:\s*(avoid-)?page/gi, (_, x, y) =>
|
|
// `break-${x}: ${y ?? ''}column`)
|
|
// Replace font-size keyword values with pixel values so they can be calculated
|
|
.replace(/font-size\s*:\s*(xx-small|x-small|small|medium|large|x-large|xx-large|xxx-large|smaller|larger)\s*([;!])/gi, (match, keyword, ending) => {
|
|
const keywordMap = {
|
|
'xx-small': '9px',
|
|
'x-small': '10px',
|
|
'small': '13px',
|
|
'medium': '16px',
|
|
'large': '18px',
|
|
'x-large': '24px',
|
|
'xx-large': '32px',
|
|
'xxx-large': '48px',
|
|
'smaller': '13px', // approximate relative value
|
|
'larger': '18px' // approximate relative value
|
|
}
|
|
return `font-size: ${keywordMap[keyword.toLowerCase()]}${ending}`
|
|
})
|
|
// If px is used as the unit of font-size, it should be converted to em and the
|
|
// number should be divided by 16
|
|
.replace(/(\d*\.?\d+)px/gi, (_, d) => `${parseFloat(d) / 16}em`)
|
|
}
|
|
// find & replace all possible relative paths for all assets without parsing
|
|
replaceString(str, href, parents = []) {
|
|
const assetMap = new Map()
|
|
const urls = this.assets.map(asset => {
|
|
// do not replace references to the file itself
|
|
if (asset.href === href) return
|
|
// href was decoded and resolved when parsing the manifest
|
|
const relative = pathRelative(pathDirname(href), asset.href)
|
|
const relativeEnc = encodeURI(relative)
|
|
const rootRelative = '/' + asset.href
|
|
const rootRelativeEnc = encodeURI(rootRelative)
|
|
const set = new Set([relative, relativeEnc, rootRelative, rootRelativeEnc])
|
|
for (const url of set) assetMap.set(url, asset)
|
|
return Array.from(set)
|
|
}).flat().filter(x => x)
|
|
if (!urls.length) return str
|
|
const regex = new RegExp(urls.map(regexEscape).join('|'), 'g')
|
|
return replaceSeries(str, regex, async match =>
|
|
this.loadItem(assetMap.get(match.replace(/^\//, '')),
|
|
parents.concat(href)))
|
|
}
|
|
unloadItem(item) {
|
|
this.unref(item?.href)
|
|
}
|
|
destroy() {
|
|
for (const url of this.#cache.values()) URL.revokeObjectURL(url)
|
|
}
|
|
}
|
|
|
|
const getHTMLFragment = (doc, id) => doc.getElementById(id)
|
|
?? doc.querySelector(`[name="${CSS.escape(id)}"]`)
|
|
|
|
const getPageSpread = properties => {
|
|
for (const p of properties) {
|
|
if (p === 'page-spread-left' || p === 'rendition:page-spread-left')
|
|
return 'left'
|
|
if (p === 'page-spread-right' || p === 'rendition:page-spread-right')
|
|
return 'right'
|
|
if (p === 'rendition:page-spread-center') return 'center'
|
|
}
|
|
}
|
|
|
|
const getDisplayOptions = doc => {
|
|
if (!doc) return null
|
|
return {
|
|
fixedLayout: getElementText(doc.querySelector('option[name="fixed-layout"]')),
|
|
openToSpread: getElementText(doc.querySelector('option[name="open-to-spread"]')),
|
|
}
|
|
}
|
|
|
|
export class EPUB {
|
|
parser = new DOMParser()
|
|
#loader
|
|
#encryption
|
|
constructor({ loadText, loadBlob, getSize, sha1 }) {
|
|
this.loadText = loadText
|
|
this.loadBlob = loadBlob
|
|
this.getSize = getSize
|
|
this.#encryption = new Encryption(deobfuscators(sha1))
|
|
}
|
|
async #loadXML(uri) {
|
|
const str = await this.loadText(uri)
|
|
if (!str) return null
|
|
const doc = this.parser.parseFromString(str, MIME.XML)
|
|
if (doc.querySelector('parsererror'))
|
|
throw new Error(`XML parsing error: ${uri}
|
|
${doc.querySelector('parsererror').innerText}`)
|
|
return doc
|
|
}
|
|
async init() {
|
|
const $container = await this.#loadXML('META-INF/container.xml')
|
|
if (!$container) throw new Error('Failed to load container file')
|
|
|
|
const opfs = Array.from(
|
|
$container.getElementsByTagNameNS(NS.CONTAINER, 'rootfile'),
|
|
getAttributes('full-path', 'media-type'))
|
|
.filter(file => file.mediaType === 'application/oebps-package+xml')
|
|
|
|
if (!opfs.length) throw new Error('No package document defined in container')
|
|
const opfPath = opfs[0].fullPath
|
|
const opf = await this.#loadXML(opfPath)
|
|
if (!opf) throw new Error('Failed to load package document')
|
|
|
|
const $encryption = await this.#loadXML('META-INF/encryption.xml')
|
|
await this.#encryption.init($encryption, opf)
|
|
|
|
this.resources = new Resources({
|
|
opf,
|
|
resolveHref: url => resolveURL(url, opfPath),
|
|
})
|
|
this.#loader = new Loader({
|
|
loadText: this.loadText,
|
|
loadBlob: uri => Promise.resolve(this.loadBlob(uri))
|
|
.then(this.#encryption.getDecoder(uri)),
|
|
resources: this.resources,
|
|
})
|
|
this.transformTarget = this.#loader.eventTarget
|
|
this.sections = this.resources.spine.map((spineItem, index) => {
|
|
const { idref, linear, properties = [] } = spineItem
|
|
const item = this.resources.getItemByID(idref)
|
|
if (!item) {
|
|
console.warn(`Could not find item with ID "${idref}" in manifest`)
|
|
return null
|
|
}
|
|
return {
|
|
id: item.href,
|
|
load: () => this.#loader.loadItem(item),
|
|
unload: () => this.#loader.unloadItem(item),
|
|
createDocument: () => this.loadDocument(item),
|
|
size: this.getSize(item.href),
|
|
cfi: this.resources.cfis[index],
|
|
linear,
|
|
pageSpread: getPageSpread(properties),
|
|
resolveHref: href => resolveURL(href, item.href),
|
|
mediaOverlay: item.mediaOverlay
|
|
? this.resources.getItemByID(item.mediaOverlay) : null,
|
|
}
|
|
}).filter(s => s)
|
|
|
|
const { navPath, ncxPath } = this.resources
|
|
if (navPath) try {
|
|
const resolve = url => resolveURL(url, navPath)
|
|
const nav = parseNav(await this.#loadXML(navPath), resolve)
|
|
this.toc = nav.toc
|
|
this.pageList = nav.pageList
|
|
this.landmarks = nav.landmarks
|
|
} catch (e) {
|
|
console.warn(e)
|
|
}
|
|
if (!this.toc && ncxPath) try {
|
|
const resolve = url => resolveURL(url, ncxPath)
|
|
const ncx = parseNCX(await this.#loadXML(ncxPath), resolve)
|
|
this.toc = ncx.toc
|
|
this.pageList = ncx.pageList
|
|
} catch (e) {
|
|
console.warn(e)
|
|
}
|
|
this.landmarks ??= this.resources.guide
|
|
|
|
const { metadata, rendition, media } = getMetadata(opf)
|
|
this.rendition = rendition
|
|
this.media = media
|
|
this.dir = this.resources.pageProgressionDirection
|
|
const displayOptions = getDisplayOptions(
|
|
await this.#loadXML('META-INF/com.apple.ibooks.display-options.xml')
|
|
?? await this.#loadXML('META-INF/com.kobobooks.display-options.xml'))
|
|
if (displayOptions) {
|
|
if (displayOptions.fixedLayout === 'true')
|
|
this.rendition.layout ??= 'pre-paginated'
|
|
if (displayOptions.openToSpread === 'false') this.sections
|
|
.find(section => section.linear !== 'no').pageSpread ??=
|
|
this.dir === 'rtl' ? 'left' : 'right'
|
|
}
|
|
|
|
this.parsedMetadata = metadata // for debugging or advanced use cases
|
|
const title = metadata?.title?.[0]
|
|
this.metadata = {
|
|
title: title?.value,
|
|
subtitle: metadata?.title?.find(x => x.titleType === 'subtitle')?.value,
|
|
sortAs: title?.fileAs,
|
|
language: metadata?.language,
|
|
identifier: getIdentifier(opf),
|
|
description: metadata?.description?.value,
|
|
publisher: metadata?.publisher?.value,
|
|
published: metadata?.date,
|
|
modified: metadata?.dctermsModified,
|
|
subject: metadata?.subject
|
|
?.filter(({ value, term }) => value || term)
|
|
?.map(({ value, term, authority }) =>
|
|
({ name: value, code: term, scheme: authority })),
|
|
rights: metadata?.rights?.value,
|
|
}
|
|
const relators = {
|
|
art: 'artist',
|
|
aut: 'author',
|
|
bkp: 'producer',
|
|
clr: 'colorist',
|
|
edt: 'editor',
|
|
ill: 'illustrator',
|
|
nrt: 'narrator',
|
|
trl: 'translator',
|
|
pbl: 'publisher',
|
|
}
|
|
const mapContributor = defaultKey => obj => {
|
|
const keys = [...new Set(obj.role?.map(({ value, scheme }) =>
|
|
(!scheme || scheme === 'marc:relators' ? relators[value] : null)
|
|
?? defaultKey))]
|
|
const value = { name: obj.value, sortAs: obj.fileAs }
|
|
return [keys?.length ? keys : [defaultKey], value]
|
|
}
|
|
metadata?.creator?.map(mapContributor('author'))
|
|
?.concat(metadata?.contributor?.map?.(mapContributor('contributor')))
|
|
?.forEach(([keys, value]) => keys.forEach(key => {
|
|
if (this.metadata[key]) this.metadata[key].push(value)
|
|
else this.metadata[key] = [value]
|
|
}))
|
|
|
|
return this
|
|
}
|
|
async loadDocument(item) {
|
|
const str = await this.loadText(item.href)
|
|
return this.parser.parseFromString(str, item.mediaType)
|
|
}
|
|
getMediaOverlay() {
|
|
return new MediaOverlay(this, this.#loadXML.bind(this))
|
|
}
|
|
resolveCFI(cfi) {
|
|
return this.resources.resolveCFI(cfi)
|
|
}
|
|
resolveHref(href) {
|
|
const [path, hash] = href.split('#')
|
|
const item = this.resources.getItemByHref(decodeURI(path))
|
|
if (!item) return null
|
|
const index = this.resources.spine.findIndex(({ idref }) => idref === item.id)
|
|
const anchor = hash ? doc => getHTMLFragment(doc, hash) : () => 0
|
|
return { index, anchor }
|
|
}
|
|
splitTOCHref(href) {
|
|
return href?.split('#') ?? []
|
|
}
|
|
getTOCFragment(doc, id) {
|
|
return doc.getElementById(id)
|
|
?? doc.querySelector(`[name="${CSS.escape(id)}"]`)
|
|
}
|
|
isExternal(uri) {
|
|
return isExternal(uri)
|
|
}
|
|
async getCover() {
|
|
const cover = this.resources?.cover
|
|
if (cover?.href) {
|
|
return new Blob([await this.loadBlob(cover.href)], { type: cover.mediaType })
|
|
}
|
|
|
|
// If cover is an XHTML/HTML page, try to extract image from it
|
|
const coverPage = this.resources?.coverPage
|
|
if (coverPage?.href) {
|
|
try {
|
|
const text = await this.loadText(coverPage.href)
|
|
const parser = new DOMParser()
|
|
const doc = parser.parseFromString(text, 'application/xhtml+xml')
|
|
|
|
// Try to find image in various ways
|
|
// 1. Look for <img> tags
|
|
const img = doc.querySelector('img')
|
|
if (img) {
|
|
const src = img.getAttribute('src')
|
|
if (src) {
|
|
const imgHref = resolveURL(src, coverPage.href)
|
|
const imgItem = this.resources.getItemByHref(imgHref)
|
|
if (imgItem) {
|
|
return new Blob([await this.loadBlob(imgItem.href)], { type: imgItem.mediaType })
|
|
}
|
|
}
|
|
}
|
|
|
|
// 2. Look for <image> tags in SVG
|
|
const svgImage = doc.querySelector('image')
|
|
if (svgImage) {
|
|
const href = svgImage.getAttribute('href') || svgImage.getAttributeNS('http://www.w3.org/1999/xlink', 'href')
|
|
if (href) {
|
|
const imgHref = resolveURL(href, coverPage.href)
|
|
const imgItem = this.resources.getItemByHref(imgHref)
|
|
if (imgItem) {
|
|
return new Blob([await this.loadBlob(imgItem.href)], { type: imgItem.mediaType })
|
|
}
|
|
}
|
|
}
|
|
} catch (e) {
|
|
console.warn('Failed to extract cover from XHTML page:', e)
|
|
}
|
|
}
|
|
|
|
// Last resort: try common cover file locations outside manifest
|
|
// This handles cases like Apple Books' iTunesArtwork
|
|
const fallbackPaths = [
|
|
'iTunesArtwork', // Apple Books cover (JPEG without extension)
|
|
'cover.jpg',
|
|
'cover.jpeg',
|
|
'cover.png',
|
|
'cover.gif',
|
|
]
|
|
|
|
for (const path of fallbackPaths) {
|
|
try {
|
|
const blob = await this.loadBlob(path)
|
|
if (blob && blob.size > 0) {
|
|
// Try to detect media type from content
|
|
const type = path === 'iTunesArtwork' ? 'image/jpeg'
|
|
: path.endsWith('.png') ? 'image/png'
|
|
: path.endsWith('.gif') ? 'image/gif'
|
|
: 'image/jpeg'
|
|
return new Blob([blob], { type })
|
|
}
|
|
} catch (e) {
|
|
// File doesn't exist, continue to next fallback
|
|
}
|
|
}
|
|
|
|
return null
|
|
}
|
|
async getCalibreBookmarks() {
|
|
const txt = await this.loadText('META-INF/calibre_bookmarks.txt')
|
|
const magic = 'encoding=json+base64:'
|
|
if (txt?.startsWith(magic)) {
|
|
const json = atob(txt.slice(magic.length))
|
|
return JSON.parse(json)
|
|
}
|
|
}
|
|
destroy() {
|
|
this.#loader?.destroy()
|
|
}
|
|
}
|