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package org.koitharu.kotatsu.core.os
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import android.annotation.SuppressLint
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import android.content.Context
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import android.content.pm.PackageManager
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import dagger.hilt.android.qualifiers.ApplicationContext
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import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
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import org.koitharu.kotatsu.parsers.util.byte2HexFormatted
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import java.io.ByteArrayInputStream
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import java.io.InputStream
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import java.security.MessageDigest
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import java.security.cert.CertificateFactory
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import java.security.cert.X509Certificate
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import javax.inject.Inject
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import javax.inject.Singleton
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@Singleton
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class AppValidator @Inject constructor(
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@ApplicationContext private val context: Context,
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) {
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val isOriginalApp by lazy {
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getCertificateSHA1Fingerprint() == CERT_SHA1
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}
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@Suppress("DEPRECATION")
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@SuppressLint("PackageManagerGetSignatures")
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private fun getCertificateSHA1Fingerprint(): String? = runCatching {
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val packageInfo = context.packageManager.getPackageInfo(context.packageName, PackageManager.GET_SIGNATURES)
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val signatures = requireNotNull(packageInfo?.signatures)
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val cert: ByteArray = signatures.first().toByteArray()
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val input: InputStream = ByteArrayInputStream(cert)
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val cf = CertificateFactory.getInstance("X509")
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val c = cf.generateCertificate(input) as X509Certificate
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val md: MessageDigest = MessageDigest.getInstance("SHA1")
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val publicKey: ByteArray = md.digest(c.encoded)
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return publicKey.byte2HexFormatted()
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}.onFailure { error ->
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error.printStackTraceDebug()
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}.getOrNull()
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private companion object {
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private const val CERT_SHA1 = "2C:19:C7:E8:07:61:2B:8E:94:51:1B:FD:72:67:07:64:5D:C2:58:AE"
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}
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}
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