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42 lines
2.1 KiB
42 lines
2.1 KiB
// Source code for the downloader.
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import('https://cdnjs.cloudflare.com/ajax/libs/jszip/3.1.5/jszip.min.js').then(async () => {
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alert('This is the McGraw-Hill Education Textbook Downloader. Click OK to start downloading the files.');
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const IMPORT_URL = (await (await fetch('https://player-api.mheducation.com/lti', { credentials: 'include' })).json()).custom_epub_url;
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const epub = new JSZip();
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const metaInf = epub.folder('META-INF');
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metaInf.file('container.xml', await (await fetch(IMPORT_URL + 'META-INF/container.xml', { credentials: 'include' })).text());
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const epubData = epub.folder('OPS');
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const opfString = await (await fetch(IMPORT_URL + 'OPS/content.opf', { credentials: 'include' })).text();
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epubData.file('content.opf', opfString);
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const opf = new DOMParser().parseFromString(opfString, 'application/xml');
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for (let item of opf.querySelector('manifest').children) {
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const href = item.getAttribute('href');
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try {
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const data = await (await fetch(`${IMPORT_URL}OPS/${href}`, { credentials: 'include' })).arrayBuffer();
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epubData.file(href, data);
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console.log('Finished downloading', href);
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} catch(e) {
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throw `Failed to download ${href}: ${e}`;
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}
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}
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alert('Finished downloading data! Click OK to start compression.');
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window.__savedTextbook = epub;
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let highestPercent = 0;
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const data = await epub.generateInternalStream({ type: 'blob' }).accumulate(({ percent }) => {
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const intPercent = Math.floor(percent);
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if (intPercent > highestPercent) {
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console.log(intPercent+'% complete');
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highestPercent = intPercent
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}
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});
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alert('Finished compressing textbook! Click OK to start download.');
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window.__savedTextbookEpub = data;
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const url = URL.createObjectURL(data);
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const tmpLink = document.createElement('a');
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tmpLink.href = url;
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const possibleTitle = opf.querySelector('metadata title');
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const titleString = possibleTitle ? possibleTitle.innerHTML : 'textbook';
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tmpLink.download = titleString + '.epub';
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tmpLink.click();
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URL.revokeObjectURL(url);
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}).catch(err => alert('Textbook download failed because an error occurred: '+err)); |