Initial commit

crunchys.js

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+const { join, basename } = require('node:path');
+const { createWriteStream } = require('node:fs');
+const { readdir, readFile, rm } = require('node:fs/promises');
+const { execSync } = require('node:child_process');
+const { Readable } = require('node:stream');
+
+const downloadLatestApk = async () => {
+  const source = 'https://www.apk20.com/apk/com.crunchyroll.crunchyroid/download/';
+  const page = await fetch(source);
+  const html = await page.text();
+  const url = html.split('<link rel="canonical" href="')[1]?.split('"')[0];
+  const id = url.split('/').reverse().at(0);
+  const downloadUrl = `https://srv01.apk20.com/com.crunchyroll.crunchyroid.${id}.xapk`;
+  const fileName = basename(downloadUrl);
+  const response = await fetch(downloadUrl);
+  if (response.ok && response.body) {
+    const filePath = join(process.cwd(), fileName);
+    const writer = createWriteStream(filePath);
+    Readable.fromWeb(response.body).pipe(writer);
+    await new Promise((resolve) => writer.on('finish', resolve));
+  }
+  return join(process.cwd(), fileName);
+};
+
+const decompileApk = (apkPath) => {
+  try {
+    execSync(`jadx ${apkPath}`, { stdio: 'inherit' });
+  } catch (error) {
+    console.error(error);
+  }
+  return apkPath.replace('.xapk', '');
+};
+
+const findConfigurationImpl = async (sourcesDir) => {
+  const entries = await readdir(sourcesDir, { withFileTypes: true });
+  for (const entry of entries) {
+    if (!entry.isDirectory()) continue;
+    const moduleDir = join(sourcesDir, entry.name);
+    const moduleEntries = await readdir(moduleDir, { withFileTypes: true });
+    for (const moduleFile of moduleEntries) {
+      if (moduleFile.isDirectory()) continue;
+      const moduleFilePath = join(moduleDir, moduleFile.name);
+      const moduleContents = await readFile(moduleFilePath, 'utf8');
+      if (moduleContents.includes(' ConfigurationImpl.kt')) {
+        return moduleContents;
+      }
+    }
+  }
+};
+
+const parseSecrets = (contents) => {
+  const lines = contents.split('\n');
+  const startIndex = lines.findIndex((line) => line.includes('https://sso.crunchyroll.com'));
+  const endIndex = lines.findIndex((line) => line.includes('CR-AndroidMobile-SSAI-Prod'));
+  const results = lines
+    .slice(startIndex, endIndex)
+    .map((line) => line.replaceAll(';', ''))
+    .map((line) => line.replaceAll('"', ''))
+    .map((line) => line.split('= ')[1])
+    .map((line) => line.trim());
+  const [, , id, secret] = results;
+  const encoded = Buffer.from(`${id}:${secret}`).toString('base64');
+  const header = `Basic ${encoded}`;
+  return { id, secret, encoded, header };
+};
+
+export const extractSecrets = async ({ cleanup = true } = {}) => {
+  console.log('Downloading latest APK...');
+  const apkPath = await downloadLatestApk();
+
+  console.log('Decompiling APK...');
+  const decompiledDir = decompileApk(apkPath);
+
+  console.log('Searching for secrets...');
+  const sourcesDir = join(decompiledDir, 'sources');
+  const configurationImpl = await findConfigurationImpl(sourcesDir);
+
+  console.log('Parsing secrets...');
+  const { id, secret, encoded, header } = parseSecrets(configurationImpl);
+
+  console.log(`Cleaning up files...`);
+  if (cleanup) await rm(apkPath, { recursive: true, force: true });
+  if (cleanup) await rm(decompiledDir, { recursive: true, force: true });
+
+  console.log(`ID: ${id}`);
+  console.log(`Secret: ${secret}`);
+  console.log(`Encoded ID with secret: ${encoded}`);
+
+  return { id, secret, encoded, header };
+};