mirror of
https://github.com/john-okeefe/foliate-js.git
synced 2026-09-09 03:19:14 -04:00
john-okeefe
6b39eb3e27
No functional changes. Normalizes epub.js to match the formatting style used throughout the rest of the codebase (2-space indentation, ASI semicolons, double-quoted strings, trailing commas in multiline).
1245 lines
41 KiB
JavaScript
1245 lines
41 KiB
JavaScript
import * as CFI from "./epubcfi.js";
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const NS = {
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CONTAINER: "urn:oasis:names:tc:opendocument:xmlns:container",
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XHTML: "http://www.w3.org/1999/xhtml",
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OPF: "http://www.idpf.org/2007/opf",
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EPUB: "http://www.idpf.org/2007/ops",
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DC: "http://purl.org/dc/elements/1.1/",
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DCTERMS: "http://purl.org/dc/terms/",
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ENC: "http://www.w3.org/2001/04/xmlenc#",
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NCX: "http://www.daisy.org/z3986/2005/ncx/",
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XLINK: "http://www.w3.org/1999/xlink",
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SMIL: "http://www.w3.org/ns/SMIL",
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};
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const MIME = {
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XML: "application/xml",
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NCX: "application/x-dtbncx+xml",
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XHTML: "application/xhtml+xml",
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HTML: "text/html",
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CSS: "text/css",
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SVG: "image/svg+xml",
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JS: /\/(x-)?(javascript|ecmascript)/,
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};
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// https://www.w3.org/TR/epub-33/#sec-reserved-prefixes
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const PREFIX = {
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a11y: "http://www.idpf.org/epub/vocab/package/a11y/#",
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dcterms: "http://purl.org/dc/terms/",
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marc: "http://id.loc.gov/vocabulary/",
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media: "http://www.idpf.org/epub/vocab/overlays/#",
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onix: "http://www.editeur.org/ONIX/book/codelists/current.html#",
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rendition: "http://www.idpf.org/vocab/rendition/#",
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schema: "http://schema.org/",
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xsd: "http://www.w3.org/2001/XMLSchema#",
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msv: "http://www.idpf.org/epub/vocab/structure/magazine/#",
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prism:
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"http://www.prismstandard.org/specifications/3.0/PRISM_CV_Spec_3.0.htm#",
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};
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const RELATORS = {
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art: "artist",
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aut: "author",
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clr: "colorist",
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edt: "editor",
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ill: "illustrator",
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nrt: "narrator",
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trl: "translator",
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pbl: "publisher",
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};
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const ONIX5 = {
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"02": "isbn",
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"06": "doi",
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15: "isbn",
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26: "doi",
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34: "issn",
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};
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// convert to camel case
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const camel = (x) =>
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x.toLowerCase().replace(/[-:](.)/g, (_, g) => g.toUpperCase());
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// strip and collapse ASCII whitespace
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// https://infra.spec.whatwg.org/#strip-and-collapse-ascii-whitespace
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const normalizeWhitespace = (str) =>
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str
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? str
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.replace(/[\t\n\f\r ]+/g, " ")
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.replace(/^[\t\n\f\r ]+/, "")
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.replace(/[\t\n\f\r ]+$/, "")
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: "";
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const filterAttribute = (attr, value, isList) =>
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isList
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? (el) => el.getAttribute(attr)?.split(/\s/)?.includes(value)
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: typeof value === "function"
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? (el) => value(el.getAttribute(attr))
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: (el) => el.getAttribute(attr) === value;
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const getAttributes =
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(...xs) =>
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(el) =>
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el
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? Object.fromEntries(xs.map((x) => [camel(x), el.getAttribute(x)]))
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: null;
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const getElementText = (el) => normalizeWhitespace(el?.textContent);
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const childGetter = (doc, ns) => {
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// ignore the namespace if it doesn't appear in document at all
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const useNS = doc.lookupNamespaceURI(null) === ns || doc.lookupPrefix(ns);
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const f = useNS
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? (el, name) => (el) => el.namespaceURI === ns && el.localName === name
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: (el, name) => (el) => el.localName === name;
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return {
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$: (el, name) => [...el.children].find(f(el, name)),
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$$: (el, name) => [...el.children].filter(f(el, name)),
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$$$: useNS
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? (el, name) => [...el.getElementsByTagNameNS(ns, name)]
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: (el, name) => [...el.getElementsByTagName(name)],
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};
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};
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const resolveURL = (url, relativeTo) => {
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try {
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if (relativeTo.includes(":")) return new URL(url, relativeTo);
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// the base needs to be a valid URL, so set a base URL and then remove it
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const root = "https://invalid.invalid/";
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const obj = new URL(url, root + relativeTo);
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obj.search = "";
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return decodeURI(obj.href.replace(root, ""));
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} catch (e) {
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console.warn(e);
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return url;
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}
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};
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const isExternal = (uri) => /^(?!blob)\w+:/i.test(uri);
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// like `path.relative()` in Node.js
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const pathRelative = (from, to) => {
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if (!from) return to;
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const as = from.replace(/\/$/, "").split("/");
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const bs = to.replace(/\/$/, "").split("/");
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const i = (as.length > bs.length ? as : bs).findIndex(
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(_, i) => as[i] !== bs[i],
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);
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return i < 0
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? ""
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: Array(as.length - i)
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.fill("..")
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.concat(bs.slice(i))
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.join("/");
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};
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const pathDirname = (str) => str.slice(0, str.lastIndexOf("/") + 1);
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// replace asynchronously and sequentially
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// same technique as https://stackoverflow.com/a/48032528
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const replaceSeries = async (str, regex, f) => {
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const matches = [];
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str.replace(regex, (...args) => (matches.push(args), null));
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const results = [];
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for (const args of matches) results.push(await f(...args));
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return str.replace(regex, () => results.shift());
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};
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const regexEscape = (str) => str.replace(/[-/\\^$*+?.()|[\]{}]/g, "\\$&");
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const tidy = (obj) => {
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for (const [key, val] of Object.entries(obj))
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if (val == null) delete obj[key];
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else if (Array.isArray(val)) {
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obj[key] = val
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.filter((x) => x)
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.map((x) => (typeof x === "object" && !Array.isArray(x) ? tidy(x) : x));
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if (!obj[key].length) delete obj[key];
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else if (obj[key].length === 1) obj[key] = obj[key][0];
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} else if (typeof val === "object") {
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obj[key] = tidy(val);
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if (!Object.keys(val).length) delete obj[key];
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}
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const keys = Object.keys(obj);
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if (keys.length === 1 && keys[0] === "name") return obj[keys[0]];
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return obj;
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};
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// https://www.w3.org/TR/epub/#sec-prefix-attr
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const getPrefixes = (doc) => {
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const map = new Map(Object.entries(PREFIX));
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const value =
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doc.documentElement.getAttributeNS(NS.EPUB, "prefix") ||
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doc.documentElement.getAttribute("prefix");
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if (value)
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for (const [, prefix, url] of value.matchAll(/(.+): +(.+)[ \t\r\n]*/g))
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map.set(prefix, url);
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return map;
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};
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// https://www.w3.org/TR/epub-rs/#sec-property-values
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// but ignoring the case where the prefix is omitted
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const getPropertyURL = (value, prefixes) => {
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if (!value) return null;
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const [a, b] = value.split(":");
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const prefix = b ? a : null;
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const reference = b ? b : a;
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const baseURL = prefixes.get(prefix);
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return baseURL ? baseURL + reference : null;
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};
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const getMetadata = (opf) => {
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const { $ } = childGetter(opf, NS.OPF);
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const $metadata = $(opf.documentElement, "metadata");
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// first pass: convert to JS objects
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const els = Object.groupBy($metadata.children, (el) =>
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el.namespaceURI === NS.DC
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? "dc"
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: el.namespaceURI === NS.OPF && el.localName === "meta"
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? el.hasAttribute("name")
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? "legacyMeta"
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: "meta"
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: "",
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);
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const baseLang =
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$metadata.getAttribute("xml:lang") ??
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opf.documentElement.getAttribute("xml:lang") ??
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"und";
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const prefixes = getPrefixes(opf);
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const parse = (el) => {
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const property = el.getAttribute("property");
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const scheme = el.getAttribute("scheme");
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return {
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property: getPropertyURL(property, prefixes) ?? property,
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scheme: getPropertyURL(scheme, prefixes) ?? scheme,
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lang: el.getAttribute("xml:lang"),
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value: getElementText(el),
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props: getProperties(el),
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// `opf:` attributes from EPUB 2 & EPUB 3.1 (removed in EPUB 3.2)
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attrs: Object.fromEntries(
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Array.from(el.attributes)
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.filter((attr) => attr.namespaceURI === NS.OPF)
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.map((attr) => [attr.localName, attr.value]),
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),
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};
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};
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const refines = Map.groupBy(els.meta ?? [], (el) =>
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el.getAttribute("refines"),
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);
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const getProperties = (el) => {
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const els = refines.get(el ? "#" + el.getAttribute("id") : null);
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if (!els) return null;
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return Object.groupBy(els.map(parse), (x) => x.property);
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};
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const dc = Object.fromEntries(
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Object.entries(Object.groupBy(els.dc, (el) => el.localName)).map(
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([name, els]) => [name, els.map(parse)],
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),
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);
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const properties = getProperties() ?? {};
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const legacyMeta = Object.fromEntries(
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els.legacyMeta?.map((el) => [
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el.getAttribute("name"),
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el.getAttribute("content"),
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]) ?? [],
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);
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// second pass: map to webpub
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const one = (x) => x?.[0]?.value;
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const prop = (x, p) => one(x?.props?.[p]);
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const makeLanguageMap = (x) => {
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if (!x) return null;
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const alts = x.props?.["alternate-script"] ?? [];
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const altRep = x.attrs["alt-rep"];
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if (!alts.length && (!x.lang || x.lang === baseLang) && !altRep)
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return x.value;
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const map = { [x.lang ?? baseLang]: x.value };
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if (altRep) map[x.attrs["alt-rep-lang"]] = altRep;
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for (const y of alts) map[y.lang] ??= y.value;
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return map;
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};
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const makeContributor = (x) =>
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x
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? {
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name: makeLanguageMap(x),
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sortAs:
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makeLanguageMap(x.props?.["file-as"]?.[0]) ?? x.attrs["file-as"],
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role: x.props?.role
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?.filter((x) => x.scheme === PREFIX.marc + "relators")
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?.map((x) => x.value) ?? [x.attrs.role],
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code: prop(x, "term") ?? x.attrs.term,
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scheme: prop(x, "authority") ?? x.attrs.authority,
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}
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: null;
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const makeCollection = (x) => ({
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name: makeLanguageMap(x),
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// NOTE: webpub requires number but EPUB allows values like "2.2.1"
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position: one(x.props?.["group-position"]),
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});
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const makeAltIdentifier = (x) => {
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const { value } = x;
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if (/^urn:/i.test(value)) return value;
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if (/^doi:/i.test(value)) return `urn:${value}`;
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const type = x.props?.["identifier-type"];
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if (!type) {
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const scheme = x.attrs.scheme;
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if (!scheme) return value;
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// https://idpf.github.io/epub-registries/identifiers/
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// but no "jdcn", which isn't a registered URN namespace
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if (/^(doi|isbn|uuid)$/i.test(scheme)) return `urn:${scheme}:${value}`;
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// NOTE: webpub requires scheme to be a URI; EPUB allows anything
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return { scheme, value };
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}
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if (type.scheme === PREFIX.onix + "codelist5") {
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const nid = ONIX5[type.value];
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if (nid) return `urn:${nid}:${value}`;
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}
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return value;
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};
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const belongsTo = Object.groupBy(
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properties["belongs-to-collection"] ?? [],
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(x) => (prop(x, "collection-type") === "series" ? "series" : "collection"),
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);
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const mainTitle =
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dc.title?.find((x) => prop(x, "title-type") === "main") ?? dc.title?.[0];
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const metadata = {
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identifier: getIdentifier(opf),
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title: makeLanguageMap(mainTitle),
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sortAs:
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makeLanguageMap(mainTitle?.props?.["file-as"]?.[0]) ??
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mainTitle?.attrs?.["file-as"] ??
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legacyMeta?.["calibre:title_sort"],
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subtitle: dc.title?.find((x) => prop(x, "title-type") === "subtitle")
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?.value,
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language: dc.language?.map((x) => x.value),
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description: one(dc.description),
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publisher: dc.publisher?.map(makeContributor),
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published:
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dc.date?.find((x) => x.attrs.event === "publication")?.value ??
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one(dc.date),
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modified:
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one(properties[PREFIX.dcterms + "modified"]) ??
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dc.date?.find((x) => x.attrs.event === "modification")?.value,
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subject: dc.subject?.map(makeContributor),
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belongsTo: {
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collection: belongsTo.collection?.map(makeCollection),
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series:
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(belongsTo.series?.map(makeCollection) ??
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legacyMeta?.["calibre:series"])
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? {
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name: legacyMeta?.["calibre:series"],
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position: parseFloat(legacyMeta?.["calibre:series_index"]),
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}
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: null,
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},
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altIdentifier: dc.identifier?.map(makeAltIdentifier),
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source: dc.source?.map(makeAltIdentifier), // NOTE: not in webpub schema
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rights: one(dc.rights), // NOTE: not in webpub schema
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pageBreakSource: one(properties["pageBreakSource"]), // NOTE: not in webpub schema
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};
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const remapContributor = (defaultKey) => (x) => {
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const keys = new Set(x.role?.map((role) => RELATORS[role] ?? defaultKey));
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return [keys.size ? keys : [defaultKey], x];
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};
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for (const [keys, val] of [].concat(
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dc.creator?.map(makeContributor)?.map(remapContributor("author")) ?? [],
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dc.contributor
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?.map(makeContributor)
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?.map(remapContributor("contributor")) ?? [],
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))
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for (const key of keys)
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if (metadata[key]) metadata[key].push(val);
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else metadata[key] = [val];
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tidy(metadata);
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if (metadata.altIdentifier === metadata.identifier)
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delete metadata.altIdentifier;
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const rendition = {};
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const media = {};
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for (const [key, val] of Object.entries(properties)) {
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if (key.startsWith(PREFIX.rendition))
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rendition[camel(key.replace(PREFIX.rendition, ""))] = one(val);
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else if (key.startsWith(PREFIX.media))
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media[camel(key.replace(PREFIX.media, ""))] = one(val);
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}
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if (media.duration) media.duration = parseClock(media.duration);
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return { metadata, rendition, media };
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};
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const parseNav = (doc, resolve = (f) => f) => {
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const { $, $$, $$$ } = childGetter(doc, NS.XHTML);
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const resolveHref = (href) => (href ? decodeURI(resolve(href)) : null);
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const parseLI = (getType) => ($li) => {
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const $a = $($li, "a") ?? $($li, "span");
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const $ol = $($li, "ol");
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const href = resolveHref($a?.getAttribute("href"));
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const label = getElementText($a) || $a?.getAttribute("title");
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// TODO: get and concat alt/title texts in content
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const result = { label, href, subitems: parseOL($ol) };
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if (getType) result.type = $a?.getAttributeNS(NS.EPUB, "type")?.split(/\s/);
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return result;
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};
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const parseOL = ($ol, getType) =>
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$ol ? $$($ol, "li").map(parseLI(getType)) : null;
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const parseNav = ($nav, getType) => parseOL($($nav, "ol"), getType);
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const $$nav = $$$(doc, "nav");
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let toc = null,
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pageList = null,
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landmarks = null,
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others = [];
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for (const $nav of $$nav) {
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const type = $nav.getAttributeNS(NS.EPUB, "type")?.split(/\s/) ?? [];
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if (type.includes("toc")) toc ??= parseNav($nav);
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else if (type.includes("page-list")) pageList ??= parseNav($nav);
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else if (type.includes("landmarks")) landmarks ??= parseNav($nav, true);
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else
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others.push({
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label: getElementText($nav.firstElementChild),
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type,
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list: parseNav($nav),
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});
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}
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return { toc, pageList, landmarks, others };
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};
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const parseNCX = (doc, resolve = (f) => f) => {
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const { $, $$ } = childGetter(doc, NS.NCX);
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const resolveHref = (href) => (href ? decodeURI(resolve(href)) : null);
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const parseItem = (el) => {
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const $label = $(el, "navLabel");
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const $content = $(el, "content");
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const label = getElementText($label);
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const href = resolveHref($content.getAttribute("src"));
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if (el.localName === "navPoint") {
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const els = $$(el, "navPoint");
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return { label, href, subitems: els.length ? els.map(parseItem) : null };
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}
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return { label, href };
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};
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const parseList = (el, itemName) => $$(el, itemName).map(parseItem);
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const getSingle = (container, itemName) => {
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const $container = $(doc.documentElement, container);
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return $container ? parseList($container, itemName) : null;
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};
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return {
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toc: getSingle("navMap", "navPoint"),
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pageList: getSingle("pageList", "pageTarget"),
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others: $$(doc.documentElement, "navList").map((el) => ({
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label: getElementText($(el, "navLabel")),
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list: parseList(el, "navTarget"),
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})),
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};
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};
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const parseClock = (str) => {
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if (!str) return;
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const parts = str.split(":").map((x) => parseFloat(x));
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if (parts.length === 3) {
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const [h, m, s] = parts;
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return h * 60 * 60 + m * 60 + s;
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}
|
|
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" ? 0.001 : 1;
|
|
return n * f;
|
|
};
|
|
|
|
class MediaOverlay extends EventTarget {
|
|
#entries;
|
|
#lastMediaOverlayItem;
|
|
#sectionIndex;
|
|
#audioIndex;
|
|
#itemIndex;
|
|
#audio;
|
|
#volume = 1;
|
|
#rate = 1;
|
|
#state;
|
|
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) {
|
|
this.#stop();
|
|
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.volume = this.#volume;
|
|
audio.playbackRate = this.#rate;
|
|
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("ended", () => {
|
|
this.#unhighlight();
|
|
URL.revokeObjectURL(url);
|
|
this.#audio = null;
|
|
this.#play(audioIndex + 1, 0).catch((e) => this.#error(e));
|
|
});
|
|
if (this.#state === "paused") {
|
|
this.#highlight();
|
|
audio.currentTime = this.#activeItem.begin ?? 0;
|
|
} else
|
|
audio.addEventListener(
|
|
"canplaythrough",
|
|
() => {
|
|
// for some reason need to seek in `canplaythrough`
|
|
// or it won't play when skipping in WebKit
|
|
audio.currentTime = this.#activeItem.begin ?? 0;
|
|
this.#state = "playing";
|
|
audio.play().catch((e) => this.#error(e));
|
|
},
|
|
{ once: true },
|
|
);
|
|
}
|
|
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.#state = "paused";
|
|
this.#audio?.pause();
|
|
}
|
|
resume() {
|
|
this.#state = "playing";
|
|
this.#audio?.play().catch((e) => this.#error(e));
|
|
}
|
|
#stop() {
|
|
if (this.#audio) {
|
|
this.#audio.pause();
|
|
URL.revokeObjectURL(this.#audio.src);
|
|
this.#audio = null;
|
|
this.#unhighlight();
|
|
}
|
|
}
|
|
stop() {
|
|
this.#state = "stopped";
|
|
this.#stop();
|
|
}
|
|
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 = $$($manifest, "item")
|
|
.map(
|
|
getAttributes(
|
|
"href",
|
|
"id",
|
|
"media-type",
|
|
"properties",
|
|
"media-overlay",
|
|
),
|
|
)
|
|
.map((item) => {
|
|
item.href = resolveHref(item.href);
|
|
item.properties = item.properties?.split(/\s/);
|
|
return item;
|
|
});
|
|
this.manifestById = new Map(this.manifest.map((item) => [item.id, item]));
|
|
this.spine = $$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 = $$($guide, "reference")
|
|
.map(getAttributes("type", "title", "href"))
|
|
.map(({ type, title, href }) => ({
|
|
label: title,
|
|
type: type.split(/\s/),
|
|
href: resolveHref(href),
|
|
}));
|
|
|
|
this.cover =
|
|
this.getItemByProperty("cover-image") ??
|
|
// EPUB 2 compat
|
|
this.getItemByID(
|
|
$$$(opf, "meta")
|
|
.find(filterAttribute("name", "cover"))
|
|
?.getAttribute("content"),
|
|
) ??
|
|
this.getItemByHref(
|
|
this.guide?.find((ref) => ref.type.includes("cover"))?.href,
|
|
);
|
|
|
|
this.cfis = CFI.fromElements($$itemref);
|
|
}
|
|
getItemByID(id) {
|
|
return this.manifestById.get(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;
|
|
$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();
|
|
constructor({ loadText, loadBlob, resources }) {
|
|
this.loadText = loadText;
|
|
this.loadBlob = loadBlob;
|
|
this.manifest = resources.manifest;
|
|
this.assets = resources.manifest;
|
|
// 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 = { data, type };
|
|
Object.defineProperty(detail, "name", { value: href }); // readonly
|
|
const event = new CustomEvent("data", { detail });
|
|
this.eventTarget.dispatchEvent(event);
|
|
const newData = await event.detail.data;
|
|
const newType = await event.detail.type;
|
|
const url = URL.createObjectURL(new Blob([newData], { type: newType }));
|
|
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);
|
|
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;
|
|
if (count < 1) {
|
|
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, mediaType } = item;
|
|
|
|
const isScript = MIME.JS.test(item.mediaType);
|
|
const detail = { type: mediaType, isScript, allow: true };
|
|
const event = new CustomEvent("load", { detail });
|
|
this.eventTarget.dispatchEvent(event);
|
|
const allow = await event.detail.allow;
|
|
if (!allow) return null;
|
|
|
|
const parent = parents.at(-1);
|
|
if (this.#cache.has(href)) return this.ref(href, parent);
|
|
|
|
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(item, parents);
|
|
// NOTE: this can be replaced with `Promise.try()`
|
|
const tryLoadBlob = Promise.resolve().then(() => this.loadBlob(href));
|
|
return this.createURL(href, tryLoadBlob, 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) return href;
|
|
return this.loadItem(item, parents.concat(base));
|
|
}
|
|
async loadReplaced(item, parents = []) {
|
|
const { href, mediaType } = item;
|
|
const parent = parents.at(-1);
|
|
let str = "";
|
|
try {
|
|
str = await this.loadText(href);
|
|
} catch (e) {
|
|
return this.createURL(href, Promise.reject(e), mediaType, parent);
|
|
}
|
|
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)
|
|
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,
|
|
),
|
|
);
|
|
for (const el of doc.querySelectorAll("[srcset]"))
|
|
el.setAttribute(
|
|
"srcset",
|
|
await replaceSeries(
|
|
el.getAttribute("srcset"),
|
|
/(\s*)(.+?)\s*((?:\s[\d.]+[wx])+\s*(?:,|$)|,\s+|$)/g,
|
|
(_, p1, p2, p3) =>
|
|
this.loadHref(p2, href, parents).then((p2) => `${p1}${p2}${p3}`),
|
|
),
|
|
);
|
|
// 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("${url}")`),
|
|
);
|
|
// apart from `url()`, strings can be used for `@import` (but why?!)
|
|
return replaceSeries(
|
|
replacedUrls,
|
|
/@import\s*["']([^"'\n]*?)["']/gi,
|
|
(_, url) =>
|
|
this.loadHref(url, href, parents).then((url) => `@import "${url}"`),
|
|
);
|
|
}
|
|
// 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.metadata = metadata;
|
|
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";
|
|
}
|
|
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;
|
|
return cover?.href
|
|
? new Blob([await this.loadBlob(cover.href)], { type: cover.mediaType })
|
|
: 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();
|
|
}
|
|
}
|