CorePatch detector

CorePatchDetector.kt

package io.github.a13e300.demo.maho

import android.app.PendingIntent
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.content.pm.PackageInstaller
import android.content.pm.PackageInstaller.EXTRA_STATUS
import android.content.pm.PackageInstaller.STATUS_PENDING_USER_ACTION
import io.github.a13e300.demo.BuildConfig
import java.util.UUID
import java.util.concurrent.CountDownLatch
import java.util.concurrent.TimeUnit
import java.util.zip.ZipEntry
import java.util.zip.ZipFile
import java.util.zip.ZipOutputStream

// code decompiled from momo-v4.4.1 (class: Bi)
// momo: https://t.me/magiskalpha/529
// https://t.me/real5ec1cff/32
// true meaning abnormal
fun detectCorePatch(context: Context): Boolean {
    val session: PackageInstaller.Session
    val uuid = UUID.randomUUID().toString()
    var result = false
    val broadcast = PendingIntent.getBroadcast(
        context,
        0,
        Intent(uuid).setPackage(BuildConfig.APPLICATION_ID),
        PendingIntent.FLAG_MUTABLE
    )
    val countDownLatch = CountDownLatch(1)
    val receiver: BroadcastReceiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context, intent: Intent) {
            val extras = intent.extras ?: return
            result = extras.getInt(EXTRA_STATUS) == STATUS_PENDING_USER_ACTION
            countDownLatch.countDown()
        }
    }
    context.registerReceiver(receiver, IntentFilter(uuid))
    val packageInstaller = context.packageManager.packageInstaller
    try {
        session = packageInstaller.openSession(
            packageInstaller.createSession(
                PackageInstaller.SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL)
            )
        )
    } catch (t: SecurityException) {
        return true
    }
    ZipOutputStream(session.openWrite("package", 0L, -1L)).use { zipOutputStream ->
        zipOutputStream.putNextEntry(ZipEntry("AndroidManifest.xml"))
        ZipFile(context.packageCodePath).use { zipFile ->
            zipFile.getInputStream(zipFile.getEntry("AndroidManifest.xml"))
                .use { it.copyTo(zipOutputStream) }
        }
        zipOutputStream.finish()
    }
    session.commit(broadcast.intentSender)
    countDownLatch.await(4L, TimeUnit.SECONDS)
    context.unregisterReceiver(receiver)
    session.abandon()
    session.close()
    return result
}