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nelsonfrick.mjs
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nelsonfrick.mjs
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/*
https://github.com/dxataclub/nelsonfrick
*/
import readline from 'node:readline';
import fs from 'node:fs';
import path from 'path';
import { mkdir } from "node:fs/promises";
const rl = readline.createInterface(process.stdin, process.stdout);
let csrfToken;
let jar;
let guid;
let products;
let target;
const reControlChars = /[\u0000-\u001F\u0080-\u009F]/g;
const reRepeatedReservedCharacters = /([<>:"/\\|?*\u0000-\u001F]){2,}/g;
const reRelativePath = /^\.+(\\|\/)|^\.+$/;
const reTrailingPeriods = /\.+$/;
const MAX_FILENAME_LENGTH = 100;
const filenameReservedRegex = /[<>:"/\\|?*\u0000-\u001F]/g;;
const windowsReservedNameRegex = /^(con|prn|aux|nul|com\d|lpt\d)$/i;
const headers = {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36",
"Accept": "*/*",
"Origin": "https://www.mynelson.com",
"Referer": "https://www.mynelson.com/",
"Sec-Ch-Ua": `"Not A(Brand";v="99", "Google Chrome";v="121", "Chromium";v="121"`,
"Accept-Language": "en-US,en;q=0.9"
}
function setJar(req) {
const raw = req.headers.getSetCookie();
jar = raw.map((entry) => {
const parts = entry.split(';');
const cookiePart = parts[0];
return cookiePart;
}).join(';');
}
function question(query, psw) {
return new Promise(res => {
rl.stdoutMuted = psw;
rl.query = query;
rl.question(query, ans => {
res(ans);
rl.stdoutMuted = !psw;
if (psw)
console.log();
});
});
}
function progress(total, name) {
const progressBarLength = 15;
let progress = 0;
function updateProgressBar() {
const percentage = (progress / total) * 100;
const progressBar = '='.repeat(Math.round((percentage / 100) * progressBarLength));
const spaces = ' '.repeat(progressBarLength - progressBar.length);
process.stdout.clearLine();
process.stdout.cursorTo(0);
process.stdout.write(`[${progressBar}${spaces}] ${percentage.toFixed(2)}% ${name}`);
}
function incrementProgress() {
if (progress < total) {
progress++;
updateProgressBar();
} else {
completeProgressBar();
}
}
function completeProgressBar() {
process.stdout.clearLine();
process.stdout.cursorTo(0);
}
return {
update: updateProgressBar,
increment: incrementProgress,
complete: completeProgressBar,
};
}
async function authorize() {
let username = await question('email: ');
let password = await question('password: ', true);
const seq1 = await fetch("https://www.mynelson.com/api/auth/csrf", {
headers: {
'Cookie': jar,
...headers
}
});
if (!seq1.ok)
throw new Error("Login failed due to a response from Nelson.")
if (!jar)
setJar(seq1);
csrfToken = (await seq1.json()).csrfToken;
const login = await fetch("https://www.mynelson.com/api/auth/callback/nedces?", {
method: "POST",
headers: {
'Cookie': jar,
...headers
},
body: new URLSearchParams({
'redirect': true,
username,
password,
csrfToken,
'callbackUrl': "https://www.mynelson.com/",
'json': true
})
});
if (!login.ok)
throw new Error(login.status === 401 ? "Nelson refused credentials." : "Login failed due to a response from Nelson, try again?")
setJar(login);
}
function getContents(resources) {
const targets = []
for (let r in resources) {
const resr = resources[r];
if (resr.icon_display === 'link')
continue;
targets.push(resr);
}
return [targets];
}
function filenamify(string, options = {}) {
if (typeof string !== 'string') {
throw new TypeError('Expected a string');
}
const replacement = options.replacement === undefined ? '!' : options.replacement;
if (filenameReservedRegex.test(replacement) && reControlChars.test(replacement)) {
throw new Error('Replacement string cannot contain reserved filename characters');
}
if (replacement.length > 0) {
string = string.replace(reRepeatedReservedCharacters, '$1');
}
string = string.normalize('NFD');
string = string.replace(reRelativePath, replacement);
string = string.replace(filenameReservedRegex, replacement);
string = string.replace(reControlChars, replacement);
string = string.replace(reTrailingPeriods, '');
if (replacement.length > 0) {
const startedWithDot = string[0] === '.';
// We removed the whole filename
if (!startedWithDot && string[0] === '.') {
string = replacement + string;
}
// We removed the whole extension
if (string[string.length - 1] === '.') {
string += replacement;
}
}
string = windowsReservedNameRegex.test(string) ? string + replacement : string;
const allowedLength = typeof options.maxLength === 'number' ? options.maxLength : MAX_FILENAME_LENGTH;
if (string.length > allowedLength) {
const extensionIndex = string.lastIndexOf('.');
if (extensionIndex === -1) {
string = string.slice(0, allowedLength);
} else {
const filename = string.slice(0, extensionIndex);
const extension = string.slice(extensionIndex);
string = filename.slice(0, Math.max(1, allowedLength - extension.length)) + extension;
}
}
return string;
}
async function downloadProd(targetId) {
const isbn13 = products[targetId].isbn;
const prodReq = await fetch('https://www.mynelson.com/api/getproduct', {
method: "POST",
headers: {
...headers,
"Cookie": jar,
"Content-Type": "text/plain;charset=UTF-8"
},
body: JSON.stringify({ guid, isbn13 })
});
const product = await prodReq.json();
const diskLocation = product.reply.diskLocation
const resources = product.resources;
const downloads = products[targetId].title
const server = `https://www.mynelson.com/resources/${diskLocation}/${isbn13}/student/`
const [targets] = getContents(resources);
const progressbr = progress(targets.length, products[targetId].title)
if (!fs.existsSync(downloads))
await mkdir(downloads);
for (let r in targets) {
const resr = targets[r];
const res = await fetch(`${server}${resr.file_path}`, {
headers: {
...headers,
"Cookie": jar
}
});
const pdf = await res.arrayBuffer();
const destination = path.resolve(`./${downloads}`, filenamify(`${resr.title}.pdf`));
console.log((destination));
fs.writeFileSync(destination, Buffer.from(pdf));
progressbr.increment();
}
}
rl._writeToOutput = function _writeToOutput(stringToWrite) {
if (rl.stdoutMuted)
rl.output.write("\x1B[2K\x1B[200D"+rl.query+"["+((rl.line.length%2==1)?"=-":"-=")+"]");
else
rl.output.write(stringToWrite);
};
try {
const prelight = await fetch("https://www.mynelson.com/api/auth/providers", {headers});
if (!prelight.ok)
throw new Error(await prelight.text());
}
catch (er) {
console.error('Nelson server not available, try again?');
process.exit(1);
}
console.log("Authenticate with mynelson.com")
while (true) {
try {
await authorize();
break;
}
catch (e) {
console.error(e.message);
}
}
try {
const sessReq = await fetch('https://www.mynelson.com/api/auth/session', {
headers: {
...headers,
"Cookie": jar
}
});
guid = (await sessReq.json()).user.guid;
const prodsReq = await fetch('https://www.mynelson.com/api/getcustomerproducts', {
method: "POST",
headers: {
...headers,
"Cookie": jar,
"Content-Type": "text/plain;charset=UTF-8"
},
body: JSON.stringify({ guid })
});
products = await prodsReq.json();
if (Object.keys(products).length < 1) {
console.log("No avilable products.");
process.exit();
}
}
catch (er) {
console.log("Problem occured while reading Nelson.")
process.exit(1);
}
console.log("\nAvailable products to pirate:")
let i = 0;
for (let p in products) {
i++;
console.log(`${i}. ${products[p].title} (ISBN: ${products[p].isbn})`)
}
i++;
console.log(`${i}. All products\n`)
while (true) {
target = parseInt(await question(`Select product (1-${i}): `));
if (target <= i && 0 < target) {
target = Object.keys(products)[target - 1]
rl.close();
break;
}
console.log('??')
}
try {
if (!target) {
for (let p in products) {
await downloadProd(p);
console.log();
}
}
else {
await downloadProd(target);
}
}
catch (er) {
console.log(er)
console.log("Problem occured while downloading product data.");
process.exit(1);
}