Init.

README.md

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+# YouTube PoToken Generator
+
+## Introduction
+
+This program outputs the mysterious pair `{ visitorData, poToken }`, with the help of `js-dom`.
+
+## How it works
+
+Only one network request is made to get a fresh copy of `visitorData`.
+
+Then `poToken` is generated with pre-downloaded scripts from YouTube and some magic provided in `lib/inject.js`
+
+No real browser is required to install.
+
+## How to use
+
+```bash
+yarn add youtube-po-token-generator
+# Or
+npm install youtube-po-token-generator
+```
+
+See `examples` for simple usages.
+
+```javascript
+const { generate } = require('youtube-po-token-generator')
+
+generate().then(console.log, console.error)
+// => { visitorData: '...', poToken: '...' }
+```
+
+Require `lib/task` directly if you have already prepared your `visitorData`.
+
+```javascript
+const { createTask } = require('youtube-po-token-generator/lib/task')
+
+const visitorData = '...'
+
+createTask(visitorData).then(task => task.start).then(console.log, console.error)
+// => { poToken: '...' }
+```
+
+## Related works
+
+This project is inspired by https://github.com/iv-org/youtube-trusted-session-generator .
+
+## More
+
+Debugging the source code from YouTube was a pain.
+
+* Pausing at key parts of the `poToken` generation may lead to misleading branches.
+
+* Modification on the injected code from `botguardData.program` may lead to invalid tokens.
+
+* Improper userAgent would lead to valid or invalid poToken being generated randomly, like a lottery.

examples/multi-thread.js

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+const { parentPort, Worker, isMainThread } = require('worker_threads')
+const { createTask } = require('../lib/task')
+const { formatError } = require('../lib/utils')
+const { fetchVisitorData } = require('../lib/workflow')
+const os = require('os')
+
+if (isMainThread) {
+  const generate = async () => {
+    const visitorData = await fetchVisitorData()
+
+    return new Promise((res, rej) => {
+      try {
+        const workers = Array(Math.max(1, os.cpus().length - 1)).fill(0).map(() => new Worker(__filename))
+
+        workers.forEach((worker, i) => {
+          worker.on('message', ({ result, data }) => {
+            if (result === 'success') {
+              console.log(`Worker ${i} finished the race.`)
+              workers.forEach(worker => {
+                worker.postMessage({ action: 'stop' })
+              })
+              res(data)
+            }
+          })
+
+          worker.on('error', (err) => {
+            console.error(`Worker ${i} encountered an error ${formatError(err)}`)
+          })
+
+          worker.on('exit', (code) => {
+            console.error(`Worker ${i} exited (${code})`)
+          })
+
+          console.log(`Starting worker ${i}...`)
+          worker.postMessage({ action: 'start', data: { visitorData } })
+        })
+      } catch (err) {
+        rej(err)
+      }
+    })
+  }
+
+  module.exports = { generate }
+} else {
+  let flagStop = false
+  let visitorData = undefined
+  let stop
+
+  const start = async () => {
+    try {
+      if (!visitorData) {
+        throw new Error('visitorData is absent')
+      }
+      const task = await createTask(visitorData)
+      stop = task.stop
+      const { poToken } = await task.start()
+      return { result: 'success', data: { visitorData, poToken } }
+    } catch (err) {
+      return { result: 'failure', data: { reason: formatError(err) } }
+    }
+  }
+
+  parentPort.on('message', async ({ action, data }) => {
+    if (action === 'start') {
+      visitorData = data.visitorData
+      const message = await start()
+      if (flagStop) {
+        return
+      }
+      parentPort.postMessage(message)
+    }
+    if (action === 'stop') {
+      flagStop = true
+      stop?.()
+      process.exit(0)
+    }
+  })
+}

examples/one-shot.js

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+const { generate } = require('../index')
+const { formatError } = require('../lib/utils')
+
+generate().then(console.log, err => console.log(formatError(err)))

index.js

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+const { createTask } = require('./lib/task')
+const { fetchVisitorData } = require('./lib/workflow')
+
+const generate = async () => {
+  const visitorData = await fetchVisitorData()
+  const task = await createTask(visitorData)
+  const { poToken } = await task.start()
+  return { visitorData, poToken }
+}
+
+module.exports = { generate }

lib/consts.js

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+const url = 'https://www.youtube.com/embed/dQw4w9WgXcQ'
+const userAgent = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko)'
+const headers = {
+  'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7',
+  'accept-language': 'en-US;q=0.9',
+  'user-agent': userAgent,
+}
+
+module.exports = { url, headers, userAgent }

lib/inject.js

@@ -0,0 +1,26 @@
+const bOa$ = bOa
+bOa = (...args) => {
+  const ret = bOa$(...args)
+  if (ret.length > 80) {
+    window.onPoToken(ret)
+  }
+  return ret
+}
+ytcfg.set({
+  'INNERTUBE_CONTEXT': {
+    ...ytcfg.get('INNERTUBE_CONTEXT'),
+    client: {
+      ...ytcfg.get('INNERTUBE_CONTEXT').client,
+      visitorData: window.visitorData,
+    },
+  },
+  'VISITOR_DATA': window.visitorData,
+  'IDENTITY_MEMENTO': {
+    'visitor_data': window.visitorData,
+  },
+})
+g.C_.create(
+  document.getElementById('player'),
+  { args: {}, attrs: {}, loaded: true },
+  ytcfg.get('WEB_PLAYER_CONTEXT_CONFIGS')['WEB_PLAYER_CONTEXT_CONFIG_ID_EMBEDDED_PLAYER'],
+)

lib/task.js

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+const fs = require('fs/promises')
+const { JSDOM, VirtualConsole } = require('jsdom')
+const { url, userAgent } = require('./consts')
+
+const createTask = async (visitorData) => {
+  const domContent = await fs.readFile('vendor/index.html', 'utf-8')
+  const baseContent = await fs.readFile(`vendor/base.js`, 'utf-8')
+  const baseAppendContent = await fs.readFile(`lib/inject.js`, 'utf-8')
+  let destroy = undefined
+  return {
+    stop: () => destroy?.(),
+    start: async () => {
+      while (true) {
+        const { poToken } = await new Promise(async (res, rej) => {
+          const { window } = new JSDOM(domContent, {
+            url,
+            pretendToBeVisual: true,
+            runScripts: 'dangerously',
+            virtualConsole: new VirtualConsole(),
+          })
+          Object.defineProperty(window.navigator, 'userAgent', { value: userAgent, writable: false })
+          window.visitorData = visitorData
+          window.onPoToken = (poToken) => {
+            res({ poToken })
+          }
+          window.eval(baseContent.replace(/}\s*\)\(_yt_player\);\s*$/, (matched) => `;${baseAppendContent};${matched}`))
+          destroy = () => {
+            window.close()
+            rej(new Error('Window is closed'))
+          }
+        }).finally(() => destroy())
+        if (poToken.length === 160) {
+          return { poToken }
+        }
+      }
+    },
+  }
+}
+
+module.exports = { createTask }

lib/utils.js

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+const https = require('https')
+const { headers, url } = require('./consts')
+
+const download = (url) => new Promise((resolve, reject) => {
+  https.get(url, { headers }, (res) => {
+    let data = ''
+
+    res.on('data', (chunk) => {
+      data += chunk
+    })
+
+    res.on('end', () => {
+      resolve(data)
+    })
+  }).on('error', (err) => {
+    reject(err)
+  })
+})
+
+const formatError = (err) => err.message || err.toString()
+
+module.exports = { download, formatError }

lib/workflow.js

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+const { download } = require('./utils')
+const { url } = require('./consts')
+
+const fetchVisitorData = async () => {
+  const data = await download(url)
+  const matched = data.match(/"visitorData":"([^"]+)/)
+  if (matched) {
+    return matched[1]
+  } else {
+    throw new Error(`Failed to find visitorData`)
+  }
+}
+
+module.exports = { fetchVisitorData }

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "youtube-po-token-generator",
+  "version": "0.1.0",
+  "author": "Yunzhe <yunzhe@zju.edu.cn>",
+  "description": "It generates a valid poToken with visitorData fetched from YouTube.",
+  "keywords": [
+    "youtube",
+    "session",
+    "poToken",
+    "visitorData",
+    "po_token",
+    "visitor_data",
+    "invidious"
+  ],
+  "repository": "https://github.com/YunzheZJU/youtube-po-token-generator.git",
+  "main": "index.js",
+  "license": "MIT",
+  "dependencies": {
+    "jsdom": "^24.1.1"
+  },
+  "engines": {
+    "node": ">=18.0"
+  }
+}

vendor/README.md

@@ -0,0 +1,2 @@
+* `index.html` was downloaded from https://www.youtube.com/embed/dQw4w9WgXcQ . Inspect its content for generating timestamp and region.
+* `base.js` was downloaded from https://www.youtube.com/s/player/d2e656ee/player_ias.vflset/en_US/base.js . `d2e656ee` should be the version number for its content.

yarn.lock

@@ -0,0 +1,283 @@
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+rrweb-cssom@^0.6.0:
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/rrweb-cssom/-/rrweb-cssom-0.6.0.tgz#ed298055b97cbddcdeb278f904857629dec5e0e1"
+  integrity sha512-APM0Gt1KoXBz0iIkkdB/kfvGOwC4UuJFeG/c+yV7wSc7q96cG/kJ0HiYCnzivD9SB53cLV1MlHFNfOuPaadYSw==
+
+rrweb-cssom@^0.7.1:
+  version "0.7.1"
+  resolved "https://registry.yarnpkg.com/rrweb-cssom/-/rrweb-cssom-0.7.1.tgz#c73451a484b86dd7cfb1e0b2898df4b703183e4b"
+  integrity sha512-TrEMa7JGdVm0UThDJSx7ddw5nVm3UJS9o9CCIZ72B1vSyEZoziDqBYP3XIoi/12lKrJR8rE3jeFHMok2F/Mnsg==
+
+"safer-buffer@>= 2.1.2 < 3.0.0":
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
+  integrity sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==
+
+saxes@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/saxes/-/saxes-6.0.0.tgz#fe5b4a4768df4f14a201b1ba6a65c1f3d9988cc5"
+  integrity sha512-xAg7SOnEhrm5zI3puOOKyy1OMcMlIJZYNJY7xLBwSze0UjhPLnWfj2GF2EpT0jmzaJKIWKHLsaSSajf35bcYnA==
+  dependencies:
+    xmlchars "^2.2.0"
+
+symbol-tree@^3.2.4:
+  version "3.2.4"
+  resolved "https://registry.yarnpkg.com/symbol-tree/-/symbol-tree-3.2.4.tgz#430637d248ba77e078883951fb9aa0eed7c63fa2"
+  integrity sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==
+
+tough-cookie@^4.1.4:
+  version "4.1.4"
+  resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-4.1.4.tgz#945f1461b45b5a8c76821c33ea49c3ac192c1b36"
+  integrity sha512-Loo5UUvLD9ScZ6jh8beX1T6sO1w2/MpCRpEP7V280GKMVUQ0Jzar2U3UJPsrdbziLEMMhu3Ujnq//rhiFuIeag==
+  dependencies:
+    psl "^1.1.33"
+    punycode "^2.1.1"
+    universalify "^0.2.0"
+    url-parse "^1.5.3"
+
+tr46@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/tr46/-/tr46-5.0.0.tgz#3b46d583613ec7283020d79019f1335723801cec"
+  integrity sha512-tk2G5R2KRwBd+ZN0zaEXpmzdKyOYksXwywulIX95MBODjSzMIuQnQ3m8JxgbhnL1LeVo7lqQKsYa1O3Htl7K5g==
+  dependencies:
+    punycode "^2.3.1"
+
+universalify@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/universalify/-/universalify-0.2.0.tgz#6451760566fa857534745ab1dde952d1b1761be0"
+  integrity sha512-CJ1QgKmNg3CwvAv/kOFmtnEN05f0D/cn9QntgNOQlQF9dgvVTHj3t+8JPdjqawCHk7V/KA+fbUqzZ9XWhcqPUg==
+
+url-parse@^1.5.3:
+  version "1.5.10"
+  resolved "https://registry.yarnpkg.com/url-parse/-/url-parse-1.5.10.tgz#9d3c2f736c1d75dd3bd2be507dcc111f1e2ea9c1"
+  integrity sha512-WypcfiRhfeUP9vvF0j6rw0J3hrWrw6iZv3+22h6iRMJ/8z1Tj6XfLP4DsUix5MhMPnXpiHDoKyoZ/bdCkwBCiQ==
+  dependencies:
+    querystringify "^2.1.1"
+    requires-port "^1.0.0"
+
+w3c-xmlserializer@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz#f925ba26855158594d907313cedd1476c5967f6c"
+  integrity sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==
+  dependencies:
+    xml-name-validator "^5.0.0"
+
+webidl-conversions@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/webidl-conversions/-/webidl-conversions-7.0.0.tgz#256b4e1882be7debbf01d05f0aa2039778ea080a"
+  integrity sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==
+
+whatwg-encoding@^3.1.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/whatwg-encoding/-/whatwg-encoding-3.1.1.tgz#d0f4ef769905d426e1688f3e34381a99b60b76e5"
+  integrity sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==
+  dependencies:
+    iconv-lite "0.6.3"
+
+whatwg-mimetype@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz#bc1bf94a985dc50388d54a9258ac405c3ca2fc0a"
+  integrity sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==
+
+whatwg-url@^14.0.0:
+  version "14.0.0"
+  resolved "https://registry.yarnpkg.com/whatwg-url/-/whatwg-url-14.0.0.tgz#00baaa7fd198744910c4b1ef68378f2200e4ceb6"
+  integrity sha512-1lfMEm2IEr7RIV+f4lUNPOqfFL+pO+Xw3fJSqmjX9AbXcXcYOkCe1P6+9VBZB6n94af16NfZf+sSk0JCBZC9aw==
+  dependencies:
+    tr46 "^5.0.0"
+    webidl-conversions "^7.0.0"
+
+ws@^8.18.0:
+  version "8.18.0"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-8.18.0.tgz#0d7505a6eafe2b0e712d232b42279f53bc289bbc"
+  integrity sha512-8VbfWfHLbbwu3+N6OKsOMpBdT4kXPDDB9cJk2bJ6mh9ucxdlnNvH1e+roYkKmN9Nxw2yjz7VzeO9oOz2zJ04Pw==
+
+xml-name-validator@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/xml-name-validator/-/xml-name-validator-5.0.0.tgz#82be9b957f7afdacf961e5980f1bf227c0bf7673"
+  integrity sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==
+
+xmlchars@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/xmlchars/-/xmlchars-2.2.0.tgz#060fe1bcb7f9c76fe2a17db86a9bc3ab894210cb"
+  integrity sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==