NewPipe/app/src/main/assets/po_token.html at 21df24abfdd2d518445820ae6139ddd2a67f5672 · Stypox/NewPipe · GitHub

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<!DOCTYPE html>
<html lang="en"><head><title></title><script>
class BotGuardClient {
  constructor(options) {
    this.userInteractionElement = options.userInteractionElement;
    this.vm = options.globalObj[options.globalName];
    this.program = options.program;
    this.vmFunctions = {};
    this.syncSnapshotFunction = null;
  }

  /**
   * Factory method to create and load a BotGuardClient instance.
   * @param options - Configuration options for the BotGuardClient.
   * @returns A promise that resolves to a loaded BotGuardClient instance.
   */
  static async create(options) {
    return await new BotGuardClient(options).load();
  }

  async load() {
    if (!this.vm)
      throw new Error('[BotGuardClient]: VM not found in the global object');

    if (!this.vm.a)
      throw new Error('[BotGuardClient]: Could not load program');

    const vmFunctionsCallback = (
      asyncSnapshotFunction,
      shutdownFunction,
      passEventFunction,
      checkCameraFunction
    ) => {
      this.vmFunctions = {
        asyncSnapshotFunction: asyncSnapshotFunction,
        shutdownFunction: shutdownFunction,
        passEventFunction: passEventFunction,
        checkCameraFunction: checkCameraFunction
      };
    };

    try {
      this.syncSnapshotFunction = await this.vm.a(this.program, vmFunctionsCallback, true, this.userInteractionElement, () => {/** no-op */ }, [ [], [] ])[0];
    } catch (error) {
      throw new Error(`[BotGuardClient]: Failed to load program (${error.message})`);
    }

    // an asynchronous function runs in the background and it will eventually call
    // `vmFunctionsCallback`, however we need to manually tell JavaScript to pass
    // control to the things running in the background by interrupting this async
    // function in any way, e.g. with a delay of 1ms. The loop is most probably not
    // needed but is there just because.
    for (let i = 0; i < 10000 && !this.vmFunctions.asyncSnapshotFunction; ++i) {
      await new Promise(f => setTimeout(f, 1))
    }

    return this;
  }

  /**
   * Takes a snapshot asynchronously.
   * @returns The snapshot result.
   * @example
   * ```ts
   * const result = await botguard.snapshot({
   *   contentBinding: {
   *     c: "a=6&a2=10&b=SZWDwKVIuixOp7Y4euGTgwckbJA&c=1729143849&d=1&t=7200&c1a=1&c6a=1&c6b=1&hh=HrMb5mRWTyxGJphDr0nW2Oxonh0_wl2BDqWuLHyeKLo",
   *     e: "ENGAGEMENT_TYPE_VIDEO_LIKE",
   *     encryptedVideoId: "P-vC09ZJcnM"
   *    }
   * });
   *
   * console.log(result);
   * ```
   */
  async snapshot(args) {
    return new Promise((resolve, reject) => {
      if (!this.vmFunctions.asyncSnapshotFunction)
        return reject(new Error('[BotGuardClient]: Async snapshot function not found'));

      this.vmFunctions.asyncSnapshotFunction((response) => resolve(response), [
        args.contentBinding,
        args.signedTimestamp,
        args.webPoSignalOutput,
        args.skipPrivacyBuffer
      ]);
    });
  }
}
/**
 * Parses the challenge data from the provided response data.
 */
function parseChallengeData(rawData) {
  let challengeData = [];

  if (rawData.length > 1 && typeof rawData[1] === 'string') {
    const descrambled = descramble(rawData[1]);
    challengeData = JSON.parse(descrambled || '[]');
  } else if (rawData.length && typeof rawData[0] === 'object') {
    challengeData = rawData[0];
  }

  const [ messageId, wrappedScript, wrappedUrl, interpreterHash, program, globalName, , clientExperimentsStateBlob ] = challengeData;

  const privateDoNotAccessOrElseSafeScriptWrappedValue = Array.isArray(wrappedScript) ? wrappedScript.find((value) => value && typeof value === 'string') : null;
  const privateDoNotAccessOrElseTrustedResourceUrlWrappedValue = Array.isArray(wrappedUrl) ? wrappedUrl.find((value) => value && typeof value === 'string') : null;

  return {
    messageId,
    interpreterJavascript: {
      privateDoNotAccessOrElseSafeScriptWrappedValue,
      privateDoNotAccessOrElseTrustedResourceUrlWrappedValue
    },
    interpreterHash,
    program,
    globalName,
    clientExperimentsStateBlob
  };
}

/**
 * Descrambles the given challenge data.
 */
function descramble(scrambledChallenge) {
  const buffer = base64ToU8(scrambledChallenge);
  if (buffer.length)
    return new TextDecoder().decode(buffer.map((b) => b + 97));
}

const base64urlCharRegex = /[-_.]/g;

const base64urlToBase64Map = {
  '-': '+',
  _: '/',
  '.': '='
};

function base64ToU8(base64) {
  let base64Mod;

  if (base64urlCharRegex.test(base64)) {
    base64Mod = base64.replace(base64urlCharRegex, function (match) {
      return base64urlToBase64Map[match];
    });
  } else {
    base64Mod = base64;
  }

  base64Mod = atob(base64Mod);

  return new Uint8Array(
    [ ...base64Mod ].map(
      (char) => char.charCodeAt(0)
    )
  );
}

function u8ToBase64(u8, base64url = false) {
  const result = btoa(String.fromCharCode(...u8));

  if (base64url) {
    return result
      .replace(/\+/g, '-')
      .replace(/\//g, '_');
  }

  return result;
}

async function runBotGuard(rawChallengeData) {
  const challengeData = parseChallengeData(rawChallengeData)
  const interpreterJavascript = challengeData.interpreterJavascript.privateDoNotAccessOrElseSafeScriptWrappedValue;

  if (interpreterJavascript) {
    new Function(interpreterJavascript)();
  } else throw new Error('Could not load VM');

  const botguard = await BotGuardClient.create({
    globalName: challengeData.globalName,
    globalObj: this,
    program: challengeData.program
  });

  const webPoSignalOutput = [];
  const botguardResponse = await botguard.snapshot({ webPoSignalOutput });
  return { webPoSignalOutput, botguardResponse }
}

async function obtainPoToken(webPoSignalOutput, integrityTokenResponse, identifier) {
  const integrityToken = integrityTokenResponse[0];
  const getMinter = webPoSignalOutput[0];

  if (!getMinter)
    throw new Error('PMD:Undefined');

  const mintCallback = await getMinter(base64ToU8(integrityToken));

  if (!(mintCallback instanceof Function))
    throw new Error('APF:Failed');

  const result = await mintCallback(new TextEncoder().encode(identifier));

  if (!result)
    throw new Error('YNJ:Undefined');

  if (!(result instanceof Uint8Array))
    throw new Error('ODM:Invalid');

  return u8ToBase64(result, true);
}
</script></head><body></body></html>