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index.js
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index.js
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#!/usr/bin/env node
const yargs = require("yargs");
const args = [yargs
.option("course", {
describe: "The course ID found in the URL",
number: true,
alias: "c"
})
.option("account", {
describe: "The <username>:<password> to your account (omit to be prompted)",
string: true,
alias: "a"
})
.option("browser", {
describe: "The path to the Chromium/Firefox browser executable",
string: true,
alias: "b",
})
.option("concurrency", {
describe: "How many concurrent downloads can occur",
number: true,
alias: "x",
default: 3
})
.option("flatten", {
describe: "Whether to flatten the videos to one folder: <output>\\<courseName>",
boolean: true,
alias: "f",
default: false
})
.option("headful", {
describe: "Show the Chromium browser that's making calls (to verify you're a human, for example)",
boolean: true,
alias: "H",
default: false
})
.option("output", {
describe: "The output folder to download the videos to",
string: true,
alias: "o",
default: process.cwd(),
defaultDescription: "$pwd"
})
.help("help")
.alias("help", "h")
.demandOption(["course"])
.wrap(yargs.terminalWidth())
.argv][0]; // wrap in array to collapse in the IDE
// Setup
const {log, nullOrUndefined, cookieSplit, getBrowserExecutable, tryRequire} = require("./util");
log("Setting up requires");
const {write, writeAt, color, moveTo} = require("./util");
const path = require("path");
const fs = require("fs");
const fsp = require("fs/promises");
const stream = require("stream");
const streamp = require("stream/promises");
const puppeteer = tryRequire("puppeteer", "puppeteer-core");
const prompt = require("inquirer").createPromptModule();
(async () => {
const plimit = (await import("p-limit")).default;
// Args
log("Collecting args");
const courseId = args.course;
const output = path.normalize(args.output ?? process.cwd());
const flatten = args.flatten;
const concurrency = args.concurrency;
const headful = args.headful;
const browserPath = getBrowserExecutable(args.browser);
// Final consts
log("Setting up consts");
const vidExtension = "mp4";
const host = `https://ondemand-player.sans.org/${courseId}`;
const videoHost = (modId, vidId) => `https://olt-content.sans.org/${modId}/video/${(vidId + 1).padStart(3, "0")}-720.${vidExtension}`;
const graphHost = "https://ondemand.sans.org/api/graphql";
const videoStateEnum = {
NOT_STARTED: {
id: 0,
char: "-",
color: "brightBlack",
},
STARTED: {
id: 1,
char: "o",
color: "blue",
},
FINISHED: {
id: 2,
char: "^",
color: "green",
},
FAILED: {
id: 3,
char: "x",
color: "red",
},
SKIPPING: {
id: 4,
char: "-",
color: "yellow",
}
};
let videoHeaders;
let graphHeaders;
let patchedMain = {};
patchedMain.promise = new Promise((resolve, _reject) => {patchedMain.resolver = resolve;});
let videoHeadSaved = {};
videoHeadSaved.promise = new Promise((resolve, _reject) => {videoHeadSaved.resolver = resolve;});
let graphHeadSaved = {};
graphHeadSaved.promise = new Promise((resolve, _reject) => {graphHeadSaved.resolver = resolve;});
// Run
log("Starting browser");
const browser = await puppeteer.launch({
executablePath: getBrowserExecutable(browserPath),
args: ["--enable-features=NetworkService"],
headless: headful === true ? false : "new",
defaultViewport: {height: 1080, width: 1080, isMobile: false},
slowMo: 25,
devtools: false,
});
const page = (await browser.pages())[0];
page.setDefaultTimeout(120 * 1000);
page.setCacheEnabled(false);
log(`Going to: ${host}`);
await page.goto(host, {waitUntil: "networkidle0"});
if((await page.$("#username")) !== null) {
log("Detected login page");
let accountData = args.account?.split(":");
accountData = [...(accountData ?? []), undefined, undefined].slice(0, 2);
let account = {
username: accountData[0] || (await prompt({name: "user", type: "input", message: "Username: "})).user,
password: accountData[1] || (await prompt({name: "pass", type: "password", message: "Password: "})).pass
}
await page.type("#username", account.username);
await page.type("#password", account.password);
delete account.username; // don't keep account in cache
delete account.password; // don't keep account in cache
delete account; // don't keep account in cache
log("Submitting");
await page.click('[type="submit"]');
}
// Setting up main.js patch
const client = await page.target().createCDPSession();
await client.send("Network.enable");
await client.send("Network.setBypassServiceWorker", {bypass: true});
await page.setRequestInterception(true);
page.on("request", async (req) => {
if(/main\..{8}.js/g.test(req.url())) {
let realScript = await page.evaluate(async (url) => (await fetch(url)).text(), req.url());
req.respond({
status: 200,
body: await patchMain(realScript),
contentType: "text/javascript"
});
patchedMain.resolver();
} else if(req.url().includes(".webm") && req.headers().cookie.includes("CloudFront")) {
videoHeaders = req.headers();
videoHeadSaved.resolver();
} else if(req.url().includes("/api/graphq") && !!req.headers()["x-access-token"]) {
graphHeaders = req.headers();
graphHeadSaved.resolver();
}
if(!req.isInterceptResolutionHandled()) req.continue();
});
log(`Going back to: ${host}`);
await page.goto(host, {waitUntil: "networkidle2"}); // we goto again because sans lags heaps
await page.waitForSelector("#course_outline");
let courseName = ""; // ""
let sectionNames = []; // [""...]
let moduleNames = []; // [[""...]...]
let moduleIds = []; // [[""...]...]
let cookieMap = []; // [[[{}]...]...]
log("Getting course name");
courseName = await page.$eval("#course_title .ondemand-course-number__text", e => e.innerText);
if(!flatten) await mkdir(makePath(flatten, output, courseName));
await patchedMain.promise;
log("Collecting sections and modules");
let sections = await page.evaluate(() => {
console.log(globalThis.sansSections);
return globalThis.sansSections;
});
sections.shift();
for(let s = 0; s < sections.length; s++) {
sectionNames[s] = sections[s].name;
moduleNames[s] = sections[s].modules.map(m => m.name)
moduleIds[s] = sections[s].modules.map(m => m.id);
cookieMap[s] = new Array(sections[s].modules.length);
}
await graphHeadSaved.promise;
for(let s = 0; s < sectionNames.length; s++) {
log(` Section ${s + 1}`);
await mkdir(makePath(flatten, output, courseName, [s, sectionNames[s]]));
for(let m = 0; m < moduleNames[s].length; m++) {
log(` Module ${m + 1}`);
await mkdir(makePath(flatten, output, courseName, [s, sectionNames[s]], [m, moduleNames[s][m]]));
let slides = await graphQuery(graphHost, moduleIds[s][m], graphHeaders, vidExtension);
cookieMap[s][m] = Object.fromEntries(slides.data.module.cookies.map((e) => [e.key, e.value]));
let videoNames = slides.data.module.slides.map((s) => s.name);
let videoStates = new Array(videoNames.length).fill(videoStateEnum.NOT_STARTED);
let failures = [];
write(" " + color(videoStateEnum.NOT_STARTED.color) + videoStates.map(() => videoStateEnum.NOT_STARTED.char).join(""));
moveTo(0);
const limit = plimit(concurrency);
let downloads = (videoNames.map(async (name, v) => limit(async () => {
// Download the video I guess...
videoStates[v] = videoStateEnum.STARTED;
writeAt(v + 4, color(videoStates[v].color) + videoStates[v].char); // + 4 because of the spaces
moveTo(0);
let dest = buildPath(flatten, [output, courseName, sectionNames, moduleNames[s], videoNames], s, m, v) + `.${vidExtension}`;
let url = videoHost(moduleIds[s][m], v);
try {
let e = await downloadVideo(url, dest, videoHeaders, cookieMap[s][m]).catch(e => e);
if(e instanceof Error) throw e;
if(e === "finished") videoStates[v] = videoStateEnum.FINISHED;
else if(e === "skipped") videoStates[v] = videoStateEnum.SKIPPING;
} catch(e) {
failures.push([name, e.message]);
videoStates[v] = videoStateEnum.FAILED;
}
writeAt(v + 4, color(videoStates[v].color) + videoStates[v].char); // + 4 because of the spaces
moveTo(0);
})));
await Promise.all(downloads)
write("\r\n");
write(color("red"));
for(let failure of failures) {
log(` ${failure.join(": ")}`);
}
write(color("green"));
let success = 0;
let failed = 0;
let skipped = 0;
for(let state of videoStates) {
if(state === videoStateEnum.FINISHED) success++;
if(state === videoStateEnum.FAILED) failed++;
if(state === videoStateEnum.SKIPPING) skipped++;
}
log(` ${success}/${videoStates.length} successfully downloaded` + (skipped > 0 ? `, ${skipped} skipped` : "") + (failed > 0 ? `, ${failed} failed` : ""))
write(color("reset"));
}
}
console.log("Done!");
await browser.close();
})();
async function downloadVideo(url, dest, headers, cookieMap) {
const abortController = new AbortController();
const abortSignal = abortController.signal;
let cookies = Object.fromEntries(headers.cookie.split("; ").map(c => cookieSplit(c)))
cookies = Object.assign(cookies, cookieMap);
cookies = Object.entries(cookies).map(c => c.join("=")).join("; ")
delete headers["range"];
headers.cookie = cookies;
const f = await fetch(url, {
headers,
"body": null,
"method": "GET",
signal: abortSignal
});
if(!f.ok) throw new Error(`fetch returned ${f.status} - ${f.statusText}`);
try {
let savedLength = fs.statSync(dest)?.size;
if(parseInt(f.headers.get("content-length")) == savedLength) {
abortController.abort();
return "skipped";
} else await fsp.unlink(dest);
} catch(e) {
if(e.code !== "ENOENT") throw e;
}
const fileStream = fs.createWriteStream(dest);
await streamp.finished(stream.Readable.fromWeb(f.body).pipe(fileStream));
return "finished";
}
async function graphQuery(url, modId, headers, vidExtension) {
const f = await fetch(url, {
headers,
body: `{"operationName":"ModuleQuery","variables":{"moduleId":"${modId}","quality":"HD","mp4":${vidExtension === "mp4"}},"query":"query ModuleQuery($moduleId: String!, $quality: String!, $mp4: Boolean!) { module(moduleId: $moduleId) { id baseUrl cookies { key value } slides { name id videoPath(quality: $quality, mp4: $mp4) } } } "}`,
method: "POST"
});
if(!f.ok) throw new Error(`fetch returned ${f.status} - ${f.statusText}`);
return await f.json();
}
async function patchMain(scriptData) {
const regexes = {
modules: /if\("CONTENT"\s*!==\s*(\w+)\.type\)\s*return null/gs,
sections: /(\w+)\s*?=\s*?.\.sections[;,\s]/gs, // In my sample it terminates on a semicolon, but we want to catch other types of terminators.
};
const replaces = {
modules: "globalThis.sansModules = globalThis.sansModules ?? {}; globalThis.sansModules[$1.id] = $1;$0",
sections: "$0;globalThis.sansSections = $1;",
};
scriptData.replace(regexes.modules, replaces.modules);
scriptData.replace(regexes.sections, replaces.sections);
return scriptData;
}
async function mkdir(dir, options = {recursive: true}) {
try {
await fsp.mkdir(dir, options);
} catch(e) {
if(e.code !== "EEXIST") throw e;
}
}
/** @type {Map<{secId, modId, vidId}, String>} */
const pathMems = new Map();
const illegalPathChars = /[\\\/\<\>:"\|\?\*\x00-\x1F]/gi;
function makePath(flatten, output, courseName, [secId, section] = [null, null], [modId, module] = [null, null], [vidId, video] = [null, null]) {
const pathMemKey = {secId, modId, vidId};
if(pathMems.has(pathMemKey)) return pathMems.get(pathMemKey);
let p = output;
if(section) section = section.replace(illegalPathChars, "");
if(module) module = module.replace(illegalPathChars, "");
if(video) video = video.replaceAll(":", "-").replace(illegalPathChars, "");
// We have to pyramid, so we don't accidentally null something and then make a weird dir structure
if(courseName ?? false) {
p = path.join(p, courseName);
if(!nullOrUndefined(secId) && !nullOrUndefined(section)) {
secId++; // we ++ here because we're passing in raw values from the code!
if(flatten) p = path.normalize(`${p} - ${secId}`);
else p = path.join(p, `${secId}. ${section}`);
if(!nullOrUndefined(modId) && !nullOrUndefined(module)) {
modId++;
if(flatten) p = path.normalize(`${p} - ${modId}`);
else p = path.join(p, `${modId}. ${module}`);
if(!nullOrUndefined(vidId) && !nullOrUndefined(video)) {
vidId++;
if(flatten) p = path.normalize(`${p} - ${vidId} - ${video}`);
else p = path.join(p, `${vidId}. ${video}`);
}
}
}
}
pathMems.set(pathMemKey, p);
return p;
}
function buildPath(flatten, [output, courseName, secNames, modNames, vidNames], secId, modId, vidId) {
return makePath(flatten, output, courseName, [secId, secNames?.[secId]], [modId, modNames?.[modId]], [vidId, vidNames?.[vidId]]);
}