762 lines
24 KiB
JavaScript
762 lines
24 KiB
JavaScript
var XML2JS = require("xml2js").Parser;
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var util = require('util');
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var EventEmitter = require('events').EventEmitter;
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try {
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// zipfile is an optional dependency:
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var ZipFile = require("zipfile").ZipFile;
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} catch (err) {
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// Mock zipfile using pure-JS adm-zip:
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var AdmZip = require('adm-zip');
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var ZipFile = function(filename) {
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this.admZip = new AdmZip(filename);
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this.names = this.admZip.getEntries().map(function(zipEntry) {
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return zipEntry.entryName;
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});
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this.count = this.names.length;
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};
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ZipFile.prototype.readFile = function(name, cb) {
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this.admZip.readFileAsync(this.admZip.getEntry(name), function(buffer, error) {
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// `error` is bogus right now, so let's just drop it.
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// see https://github.com/cthackers/adm-zip/pull/88
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return cb(null, buffer);
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});
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};
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}
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//TODO: Cache parsed data
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/**
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* new EPub(fname[, imageroot][, linkroot])
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* - fname (String): filename for the ebook
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* - imageroot (String): URL prefix for images
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* - linkroot (String): URL prefix for links
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*
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* Creates an Event Emitter type object for parsing epub files
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*
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* var epub = new EPub("book.epub");
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* epub.on("end", function () {
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* console.log(epub.spine);
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* });
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* epub.on("error", function (error) { ... });
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* epub.parse();
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*
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* Image and link URL format is:
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*
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* imageroot + img_id + img_zip_path
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*
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* So an image "logo.jpg" which resides in "OPT/" in the zip archive
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* and is listed in the manifest with id "logo_img" will have the
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* following url (providing that imageroot is "/images/"):
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*
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* /images/logo_img/OPT/logo.jpg
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**/
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function EPub(fname, imageroot, linkroot) {
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EventEmitter.call(this);
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this.filename = fname;
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this.imageroot = (imageroot || "/images/").trim();
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this.linkroot = (linkroot || "/links/").trim();
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if (this.imageroot.substr(-1) != "/") {
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this.imageroot += "/";
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}
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if (this.linkroot.substr(-1) != "/") {
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this.linkroot += "/";
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}
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}
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util.inherits(EPub, EventEmitter);
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/**
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* EPub#parse() -> undefined
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*
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* Starts the parser, needs to be called by the script
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**/
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EPub.prototype.parse = function () {
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this.containerFile = false;
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this.mimeFile = false;
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this.rootFile = false;
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this.metadata = {};
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this.manifest = {};
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this.spine = {toc: false, contents: []};
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this.flow = [];
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this.toc = [];
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this.open();
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};
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/**
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* EPub#open() -> undefined
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*
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* Opens the epub file with Zip unpacker, retrieves file listing
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* and runs mime type check
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**/
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EPub.prototype.open = function () {
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try {
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this.zip = new ZipFile(this.filename);
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} catch (E) {
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this.emit("error", new Error("Invalid/missing file"));
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return;
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}
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if (!this.zip.names || !this.zip.names.length) {
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this.emit("error", new Error("No files in archive"));
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return;
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}
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this.checkMimeType();
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};
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/**
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* EPub#checkMimeType() -> undefined
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*
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* Checks if there's a file called "mimetype" and that it's contents
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* are "application/epub+zip". On success runs root file check.
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**/
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EPub.prototype.checkMimeType = function () {
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var i, len;
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for (i = 0, len = this.zip.names.length; i < len; i++) {
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if (this.zip.names[i].toLowerCase() == "mimetype") {
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this.mimeFile = this.zip.names[i];
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break;
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}
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}
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if (!this.mimeFile) {
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this.emit("error", new Error("No mimetype file in archive"));
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return;
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}
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this.zip.readFile(this.mimeFile, (function (err, data) {
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if (err) {
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this.emit("error", new Error("Reading archive failed"));
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return;
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}
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var txt = data.toString("utf-8").toLowerCase().trim();
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if (txt != "application/epub+zip") {
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this.emit("error", new Error("Unsupported mime type"));
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return;
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}
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this.getRootFiles();
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}).bind(this));
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};
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/**
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* EPub#getRootFiles() -> undefined
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*
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* Looks for a "meta-inf/container.xml" file and searches for a
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* rootfile element with mime type "application/oebps-package+xml".
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* On success calls the rootfile parser
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**/
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EPub.prototype.getRootFiles = function () {
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var i, len;
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for (i = 0, len = this.zip.names.length; i < len; i++) {
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if (this.zip.names[i].toLowerCase() == "meta-inf/container.xml") {
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this.containerFile = this.zip.names[i];
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break;
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}
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}
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if (!this.containerFile) {
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this.emit("error", new Error("No container file in archive"));
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return;
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}
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this.zip.readFile(this.containerFile, (function (err, data) {
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if (err) {
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this.emit("error", new Error("Reading archive failed"));
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return;
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}
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var xml = data.toString("utf-8").toLowerCase().trim(),
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xmlparser = new XML2JS();
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xmlparser.on("end", (function (result) {
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if (!result.rootfiles || !result.rootfiles.rootfile) {
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this.emit("error", new Error("No rootfiles found"));
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return;
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}
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var rootfile = result.rootfiles.rootfile,
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filename = false, i, len;
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if (Array.isArray(rootfile)) {
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for (i = 0, len = rootfile.length; i < len; i++) {
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if (rootfile[i]["@"]["media-type"] &&
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rootfile[i]["@"]["media-type"] == "application/oebps-package+xml" &&
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rootfile[i]["@"]["full-path"]) {
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filename = rootfile[i]["@"]["full-path"].toLowerCase().trim();
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break;
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}
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}
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} else if (rootfile["@"]) {
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if (rootfile["@"]["media-type"] != "application/oebps-package+xml" || !rootfile["@"]["full-path"]) {
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this.emit("error", new Error("Rootfile in unknown format"));
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return;
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}
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filename = rootfile["@"]["full-path"].toLowerCase().trim();
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}
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if (!filename) {
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this.emit("error", new Error("Empty rootfile"));
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return;
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}
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for (i = 0, len = this.zip.names.length; i < len; i++) {
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if (this.zip.names[i].toLowerCase() == filename) {
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this.rootFile = this.zip.names[i];
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break;
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}
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}
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if (!this.rootFile) {
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this.emit("error", new Error("Rootfile not found from archive"));
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return;
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}
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this.handleRootFile();
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}).bind(this));
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xmlparser.on("error", (function (err) {
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this.emit("error", new Error("Parsing container XML failed"));
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return;
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}).bind(this));
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xmlparser.parseString(xml);
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}).bind(this));
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};
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/**
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* EPub#handleRootFile() -> undefined
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*
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* Parses the rootfile XML and calls rootfile parser
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**/
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EPub.prototype.handleRootFile = function () {
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this.zip.readFile(this.rootFile, (function (err, data) {
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if (err) {
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this.emit("error", new Error("Reading archive failed"));
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return;
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}
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var xml = data.toString("utf-8"),
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xmlparser = new XML2JS();
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xmlparser.on("end", this.parseRootFile.bind(this));
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xmlparser.on("error", (function (err) {
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this.emit("error", new Error("Parsing container XML failed"));
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return;
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}).bind(this));
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xmlparser.parseString(xml);
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}).bind(this));
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};
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/**
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* EPub#parseRootFile() -> undefined
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*
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* Parses elements "metadata," "manifest," "spine" and TOC.
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* Emits "end" if no TOC
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**/
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EPub.prototype.parseRootFile = function (rootfile) {
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this.version = rootfile['@'].version || '2.0';
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var i, len, keys, keyparts, key;
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keys = Object.keys(rootfile);
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for (i = 0, len = keys.length; i < len; i++) {
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keyparts = keys[i].split(":");
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key = (keyparts.pop() || "").toLowerCase().trim();
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switch (key) {
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case "metadata":
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this.parseMetadata(rootfile[keys[i]]);
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break;
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case "manifest":
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this.parseManifest(rootfile[keys[i]]);
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break;
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case "spine":
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this.parseSpine(rootfile[keys[i]]);
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break;
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case "guide":
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//this.parseGuide(rootfile[keys[i]]);
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break;
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}
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}
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if (this.spine.toc) {
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this.parseTOC();
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} else {
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this.emit("end");
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}
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};
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/**
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* EPub#parseMetadata() -> undefined
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*
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* Parses "metadata" block (book metadata, title, author etc.)
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**/
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EPub.prototype.parseMetadata = function (metadata) {
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var i, j, len, keys, keyparts, key;
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keys = Object.keys(metadata);
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for (i = 0, len = keys.length; i < len; i++) {
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keyparts = keys[i].split(":");
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key = (keyparts.pop() || "").toLowerCase().trim();
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switch (key) {
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case "publisher":
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if (Array.isArray(metadata[keys[i]])) {
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this.metadata.publisher = String(metadata[keys[i]][0] && metadata[keys[i]][0]["#"] || metadata[keys[i]][0] || "").trim();
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} else {
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this.metadata.publisher = String(metadata[keys[i]]["#"] || metadata[keys[i]] || "").trim();
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}
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break;
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case "language":
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if (Array.isArray(metadata[keys[i]])) {
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this.metadata.language = String(metadata[keys[i]][0] && metadata[keys[i]][0]["#"] || metadata[keys[i]][0] || "").toLowerCase().trim();
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} else {
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this.metadata.language = String(metadata[keys[i]]["#"] || metadata[keys[i]] || "").toLowerCase().trim();
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}
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break;
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case "title":
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if (Array.isArray(metadata[keys[i]])) {
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this.metadata.title = String(metadata[keys[i]][0] && metadata[keys[i]][0]["#"] || metadata[keys[i]][0] || "").trim();
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} else {
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this.metadata.title = String(metadata[keys[i]]["#"] || metadata[keys[i]] || "").trim();
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}
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break;
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case "subject":
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if (Array.isArray(metadata[keys[i]])) {
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this.metadata.subject = String(metadata[keys[i]][0] && metadata[keys[i]][0]["#"] || metadata[keys[i]][0] || "").trim();
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} else {
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this.metadata.subject = String(metadata[keys[i]]["#"] || metadata[keys[i]] || "").trim();
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}
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break;
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case "description":
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if (Array.isArray(metadata[keys[i]])) {
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this.metadata.description = String(metadata[keys[i]][0] && metadata[keys[i]][0]["#"] || metadata[keys[i]][0] || "").trim();
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} else {
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this.metadata.description = String(metadata[keys[i]]["#"] || metadata[keys[i]] || "").trim();
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}
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break;
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case "creator":
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if (Array.isArray(metadata[keys[i]])) {
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this.metadata.creator = String(metadata[keys[i]][0] && metadata[keys[i]][0]["#"] || metadata[keys[i]][0] || "").trim();
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this.metadata.creatorFileAs = String(metadata[keys[i]][0] && metadata[keys[i]][0]['@'] && metadata[keys[i]][0]['@']["opf:file-as"] || this.metadata.creator).trim();
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} else {
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this.metadata.creator = String(metadata[keys[i]]["#"] || metadata[keys[i]] || "").trim();
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this.metadata.creatorFileAs = String(metadata[keys[i]]['@'] && metadata[keys[i]]['@']["opf:file-as"] || this.metadata.creator).trim();
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}
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break;
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case "date":
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if (Array.isArray(metadata[keys[i]])) {
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this.metadata.date = String(metadata[keys[i]][0] && metadata[keys[i]][0]["#"] || metadata[keys[i]][0] || "").trim();
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} else {
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this.metadata.date = String(metadata[keys[i]]["#"] || metadata[keys[i]] || "").trim();
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}
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break;
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case "identifier":
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if (metadata[keys[i]]["@"] && metadata[keys[i]]["@"]["opf:scheme"] == "ISBN") {
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this.metadata.ISBN = String(metadata[keys[i]]["#"] || "").trim();
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} else if (metadata[keys[i]]["@"] && metadata[keys[i]]["@"].id && metadata[keys[i]]["@"].id.match(/uuid/i)) {
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this.metadata.UUID = String(metadata[keys[i]]["#"] || "").replace('urn:uuid:', '').toUpperCase().trim();
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} else if (Array.isArray(metadata[keys[i]])) {
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for (j = 0; j < metadata[keys[i]].length; j++) {
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if (metadata[keys[i]][j]["@"]) {
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if (metadata[keys[i]][j]["@"]["opf:scheme"] == "ISBN") {
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this.metadata.ISBN = String(metadata[keys[i]][j]["#"] || "").trim();
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} else if (metadata[keys[i]][j]["@"].id && metadata[keys[i]][j]["@"].id.match(/uuid/i)) {
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this.metadata.UUID = String(metadata[keys[i]][j]["#"] || "").replace('urn:uuid:', '').toUpperCase().trim();
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}
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}
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}
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}
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break;
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}
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}
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var metas = metadata['meta'] || {};
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Object.keys(metas).forEach(function(key) {
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var meta = metas[key];
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if (meta['@'] && meta['@'].name) {
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var name = meta['@'].name;
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this.metadata[name] = meta['@'].content;
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}
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if (meta['#'] && meta['@'].property) {
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this.metadata[meta['@'].property] = meta['#'];
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}
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}, this);
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};
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/**
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* EPub#parseManifest() -> undefined
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*
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* Parses "manifest" block (all items included, html files, images, styles)
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**/
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EPub.prototype.parseManifest = function (manifest) {
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var i, len, path = this.rootFile.split("/"), element, path_str;
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path.pop();
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path_str = path.join("/");
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if (manifest.item) {
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for (i = 0, len = manifest.item.length; i < len; i++) {
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if (manifest.item[i]['@']) {
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element = manifest.item[i]['@'];
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if (element.href && element.href.substr(0, path_str.length) != path_str) {
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element.href = path.concat([element.href]).join("/");
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}
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this.manifest[manifest.item[i]['@'].id] = element;
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}
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}
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}
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};
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/**
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* EPub#parseSpine() -> undefined
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*
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* Parses "spine" block (all html elements that are shown to the reader)
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**/
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EPub.prototype.parseSpine = function (spine) {
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var i, len, path = this.rootFile.split("/"), element;
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path.pop();
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if (spine['@'] && spine['@'].toc) {
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this.spine.toc = this.manifest[spine['@'].toc] || false;
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}
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if (spine.itemref) {
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if(!Array.isArray(spine.itemref)){
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spine.itemref = [spine.itemref];
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}
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for (i = 0, len = spine.itemref.length; i < len; i++) {
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if (spine.itemref[i]['@']) {
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if (element = this.manifest[spine.itemref[i]['@'].idref]) {
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this.spine.contents.push(element);
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}
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}
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}
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}
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this.flow = this.spine.contents;
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};
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/**
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* EPub#parseTOC() -> undefined
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*
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* Parses ncx file for table of contents (title, html file)
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**/
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EPub.prototype.parseTOC = function () {
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var i, len, path = this.spine.toc.href.split("/"), id_list = {}, keys;
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path.pop();
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keys = Object.keys(this.manifest);
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for (i = 0, len = keys.length; i < len; i++) {
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id_list[this.manifest[keys[i]].href] = keys[i];
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}
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this.zip.readFile(this.spine.toc.href, (function (err, data) {
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if (err) {
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this.emit("error", new Error("Reading archive failed"));
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return;
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}
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var xml = data.toString("utf-8"),
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xmlparser = new XML2JS();
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xmlparser.on("end", (function (result) {
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if (result.navMap && result.navMap.navPoint) {
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this.toc = this.walkNavMap(result.navMap.navPoint, path, id_list);
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}
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this.emit("end");
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}).bind(this));
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xmlparser.on("error", (function (err) {
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this.emit("error", new Error("Parsing container XML failed"));
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return;
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}).bind(this));
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xmlparser.parseString(xml);
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}).bind(this));
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};
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/**
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* EPub#walkNavMap(branch, path, id_list,[, level]) -> Array
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* - branch (Array | Object): NCX NavPoint object
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* - path (Array): Base path
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* - id_list (Object): map of file paths and id values
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* - level (Number): deepness
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*
|
||
* Walks the NavMap object through all levels and finds elements
|
||
* for TOC
|
||
**/
|
||
EPub.prototype.walkNavMap = function (branch, path, id_list, level) {
|
||
level = level || 0;
|
||
|
||
// don't go too far
|
||
if (level > 7) {
|
||
return [];
|
||
}
|
||
|
||
var output = [];
|
||
|
||
if (!Array.isArray(branch)) {
|
||
branch = [branch];
|
||
}
|
||
|
||
for (var i = 0; i < branch.length; i++) {
|
||
if (branch[i].navLabel) {
|
||
|
||
var title = '';
|
||
if (branch[i].navLabel && typeof branch[i].navLabel.text == 'string') {
|
||
title = branch[i].navLabel.text.trim();
|
||
}
|
||
var order = Number(branch[i]["@"] && branch[i]["@"].playOrder || 0);
|
||
if (isNaN(order)) {
|
||
order = 0;
|
||
}
|
||
var href = '';
|
||
if (branch[i].content && branch[i].content["@"] && typeof branch[i].content["@"].src == 'string') {
|
||
href = branch[i].content["@"].src.trim();
|
||
}
|
||
|
||
var element = {
|
||
level: level,
|
||
order: order,
|
||
title: title
|
||
};
|
||
|
||
if (href) {
|
||
href = path.concat([href]).join("/");
|
||
element.href = href;
|
||
|
||
if (id_list[element.href]) {
|
||
// link existing object
|
||
element = this.manifest[id_list[element.href]];
|
||
element.title = title;
|
||
element.order = order;
|
||
element.level = level;
|
||
} else {
|
||
// use new one
|
||
element.href = href;
|
||
element.id = (branch[i]["@"] && branch[i]["@"].id || "").trim();
|
||
}
|
||
|
||
output.push(element);
|
||
}
|
||
}
|
||
if (branch[i].navPoint) {
|
||
output = output.concat(this.walkNavMap(branch[i].navPoint, path, id_list, level + 1));
|
||
}
|
||
}
|
||
return output;
|
||
};
|
||
|
||
/**
|
||
* EPub#getChapter(id, callback) -> undefined
|
||
* - id (String): Manifest id value for a chapter
|
||
* - callback (Function): callback function
|
||
*
|
||
* Finds a chapter text for an id. Replaces image and link URL's, removes
|
||
* <head> etc. elements. Return only chapters with mime type application/xhtml+xml
|
||
**/
|
||
EPub.prototype.getChapter = function (id, callback) {
|
||
this.getChapterRaw(id, (function (err, str) {
|
||
if (err) {
|
||
callback(err);
|
||
return;
|
||
}
|
||
|
||
var i, len, path = this.rootFile.split("/"), keys = Object.keys(this.manifest);
|
||
path.pop();
|
||
|
||
// remove linebreaks (no multi line matches in JS regex!)
|
||
str = str.replace(/\r?\n/g, "\u0000");
|
||
|
||
// keep only <body> contents
|
||
str.replace(/<body[^>]*?>(.*)<\/body[^>]*?>/i, function (o, d) {
|
||
str = d.trim();
|
||
});
|
||
|
||
// remove <script> blocks if any
|
||
str = str.replace(/<script[^>]*?>(.*?)<\/script[^>]*?>/ig, function (o, s) {
|
||
return "";
|
||
});
|
||
|
||
// remove <style> blocks if any
|
||
str = str.replace(/<style[^>]*?>(.*?)<\/style[^>]*?>/ig, function (o, s) {
|
||
return "";
|
||
});
|
||
|
||
// remove onEvent handlers
|
||
str = str.replace(/(\s)(on\w+)(\s*=\s*["']?[^"'\s>]*?["'\s>])/g, function (o, a, b, c) {
|
||
return a + "skip-" + b + c;
|
||
});
|
||
|
||
// replace images
|
||
str = str.replace(/(\ssrc\s*=\s*["']?)([^"'\s>]*?)(["'\s>])/g, (function (o, a, b, c) {
|
||
var img = path.concat([b]).join("/").trim(),
|
||
element;
|
||
|
||
for (i = 0, len = keys.length; i < len; i++) {
|
||
if (this.manifest[keys[i]].href == img) {
|
||
element = this.manifest[keys[i]];
|
||
break;
|
||
}
|
||
}
|
||
|
||
// include only images from manifest
|
||
if (element) {
|
||
return a + this.imageroot + element.id + "/" + img + c;
|
||
} else {
|
||
return "";
|
||
}
|
||
|
||
}).bind(this));
|
||
|
||
// replace links
|
||
str = str.replace(/(\shref\s*=\s*["']?)([^"'\s>]*?)(["'\s>])/g, (function (o, a, b, c) {
|
||
var linkparts = b && b.split("#"),
|
||
link = path.concat([(linkparts.shift() || "")]).join("/").trim(),
|
||
element;
|
||
|
||
for (i = 0, len = keys.length; i < len; i++) {
|
||
if (this.manifest[keys[i]].href.split("#")[0] == link) {
|
||
element = this.manifest[keys[i]];
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (linkparts.length) {
|
||
link += "#" + linkparts.join("#");
|
||
}
|
||
|
||
// include only images from manifest
|
||
if (element) {
|
||
return a + this.linkroot + element.id + "/" + link + c;
|
||
} else {
|
||
return a + b + c;
|
||
}
|
||
|
||
}).bind(this));
|
||
|
||
// bring back linebreaks
|
||
str = str.replace(/\u0000/g, "\n").trim();
|
||
|
||
callback(null, str);
|
||
}).bind(this));
|
||
};
|
||
|
||
|
||
/**
|
||
* EPub#getChapterRaw(id, callback) -> undefined
|
||
* - id (String): Manifest id value for a chapter
|
||
* - callback (Function): callback function
|
||
*
|
||
* Returns the raw chapter text for an id.
|
||
**/
|
||
EPub.prototype.getChapterRaw = function (id, callback) {
|
||
if (this.manifest[id]) {
|
||
|
||
if (!(this.manifest[id]['media-type'] == "application/xhtml+xml" || this.manifest[id]['media-type'] == "image/svg+xml")) {
|
||
return callback(new Error("Invalid mime type for chapter"));
|
||
}
|
||
|
||
this.zip.readFile(this.manifest[id].href, (function (err, data) {
|
||
if (err) {
|
||
callback(new Error("Reading archive failed"));
|
||
return;
|
||
}
|
||
|
||
var str = data.toString("utf-8");
|
||
|
||
callback(null, str);
|
||
|
||
}).bind(this));
|
||
} else {
|
||
callback(new Error("File not found"));
|
||
}
|
||
};
|
||
|
||
|
||
/**
|
||
* EPub#getImage(id, callback) -> undefined
|
||
* - id (String): Manifest id value for an image
|
||
* - callback (Function): callback function
|
||
*
|
||
* Finds an image for an id. Returns the image as Buffer. Callback gets
|
||
* an error object, image buffer and image content-type.
|
||
* Return only images with mime type image
|
||
**/
|
||
EPub.prototype.getImage = function (id, callback) {
|
||
if (this.manifest[id]) {
|
||
|
||
if ((this.manifest[id]['media-type'] || "").toLowerCase().trim().substr(0, 6) != "image/") {
|
||
return callback(new Error("Invalid mime type for image"));
|
||
}
|
||
|
||
this.getFile(id, callback);
|
||
} else {
|
||
callback(new Error("File not found"));
|
||
}
|
||
};
|
||
|
||
|
||
/**
|
||
* EPub#getFile(id, callback) -> undefined
|
||
* - id (String): Manifest id value for a file
|
||
* - callback (Function): callback function
|
||
*
|
||
* Finds a file for an id. Returns the file as Buffer. Callback gets
|
||
* an error object, file contents buffer and file content-type.
|
||
**/
|
||
EPub.prototype.getFile = function (id, callback) {
|
||
if (this.manifest[id]) {
|
||
|
||
this.zip.readFile(this.manifest[id].href, (function (err, data) {
|
||
if (err) {
|
||
callback(new Error("Reading archive failed"));
|
||
return;
|
||
}
|
||
|
||
callback(null, data, this.manifest[id]['media-type']);
|
||
}).bind(this));
|
||
} else {
|
||
callback(new Error("File not found"));
|
||
}
|
||
};
|
||
|
||
|
||
EPub.prototype.readFile = function(filename, options, callback_) {
|
||
var callback = arguments[arguments.length - 1];
|
||
|
||
if (util.isFunction(options) || !options) {
|
||
this.zip.readFile(filename, callback);
|
||
} else if (util.isString(options)) {
|
||
// options is an encoding
|
||
this.zip.readFile(filename, function(err, data) {
|
||
if (err) {
|
||
callback(new Error('Reading archive failed'));
|
||
return;
|
||
}
|
||
callback(null, data.toString(options));
|
||
});
|
||
} else {
|
||
throw new TypeError('Bad arguments');
|
||
}
|
||
};
|
||
|
||
|
||
// Expose to the world
|
||
module.exports = EPub; |