Download PDF from read.nlc.cn

nlc-getbook.js

async function downloadBook(aid, bid) {
  const [title, myreader, kime, fime] = await getBookKey(aid, bid)

  const r = await fetch(`http://read.nlc.cn/menhu/OutOpenBook/getReader?aid=${aid}&bid=${bid}&kime=${kime}&fime=${fime}`, { method: "POST", headers: { myreader: myreader }})
  const d = await r.arrayBuffer()
  saveByteArray(title + ".pdf", d)
}

async function getBookKey(aid, bid) {
	const r = await fetch(`http://read.nlc.cn/OutOpenBook/OpenObjectBook?aid=${aid}&bid=${bid}`)
	const d = await r.text()
	const title = /var title = \'(.+?)\'/.exec(d)[1]
	const myreader = /tokenKey=\"(\w+)\"/.exec(d)[1]
	const kime = /timeKey=\"(\w+)\"/.exec(d)[1]
	const fime = /timeFlag=\"(\w+)\"/.exec(d)[1]
	return [title, myreader, kime, fime]
}

// https://stackoverflow.com/a/37340749/5488616
function saveByteArray(reportName, byte) {
    var blob = new Blob([byte], {type: "application/pdf"});
    var link = document.createElement('a');
    link.href = window.URL.createObjectURL(blob);
    var fileName = reportName;
    link.download = fileName;
    link.click();
};


downloadBook("403", "8179.0")

// To be executed at http://read.nlc.cn/ in the browser console