120 lines
3.9 KiB
Kotlin
120 lines
3.9 KiB
Kotlin
/*
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* SPDX-FileCopyrightText: 2014, microG Project Team
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* SPDX-License-Identifier: Apache-2.0
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*/
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package org.microg.nlp.service
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import android.annotation.SuppressLint
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import android.content.ComponentName
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import android.content.Context
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import android.content.Intent
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import android.content.ServiceConnection
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import android.content.pm.PackageInfo
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import android.content.pm.PackageManager
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import android.os.IBinder
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import android.util.Log
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import kotlinx.coroutines.CoroutineScope
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import java.security.MessageDigest
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import java.security.NoSuchAlgorithmException
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fun <T> Array<out T>?.isNotNullOrEmpty(): Boolean {
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return this != null && this.isNotEmpty()
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}
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abstract class AbstractBackendHelper(private val TAG: String, private val context: Context, protected val coroutineScope: CoroutineScope, val serviceIntent: Intent, val signatureDigest: String?) : ServiceConnection {
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private var bound: Boolean = false
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protected abstract suspend fun close()
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protected abstract fun hasBackend(): Boolean
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override fun onServiceConnected(name: ComponentName, service: IBinder) {
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bound = true
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Log.d(TAG, "Bound to: $name")
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}
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override fun onServiceDisconnected(name: ComponentName) {
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bound = false
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Log.d(TAG, "Unbound from: $name")
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}
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suspend fun unbind() {
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if (bound) {
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if (hasBackend()) {
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try {
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close()
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} catch (e: Exception) {
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Log.w(TAG, e)
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}
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}
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try {
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Log.d(TAG, "Unbinding from: $serviceIntent")
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context.unbindService(this)
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} catch (e: Exception) {
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Log.w(TAG, e)
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}
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bound = false
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}
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}
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fun bind() {
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if (!bound) {
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Log.d(TAG, "Binding to: $serviceIntent sig: $signatureDigest")
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if (serviceIntent.getPackage() == null) {
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Log.w(TAG, "Intent is not properly resolved, can't verify signature. Aborting.")
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return
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}
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val computedDigest = firstSignatureDigest(context, serviceIntent.getPackage(), if (signatureDigest?.length == 40) "SHA-1" else "SHA-256")
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if (signatureDigest != null && signatureDigest != computedDigest) {
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Log.w(TAG, "Target signature does not match selected package ($signatureDigest != $computedDigest). Aborting.")
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return
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}
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try {
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context.bindService(serviceIntent, this, Context.BIND_AUTO_CREATE)
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} catch (e: Exception) {
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Log.w(TAG, e)
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}
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}
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}
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companion object {
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@Suppress("DEPRECATION")
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@SuppressLint("PackageManagerGetSignatures")
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fun firstSignatureDigest(context: Context, packageName: String?, algorithm: String): String? {
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val packageManager = context.packageManager
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val info: PackageInfo?
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try {
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info = packageManager.getPackageInfo(packageName!!, PackageManager.GET_SIGNATURES)
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} catch (e: PackageManager.NameNotFoundException) {
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return null
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}
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if (info?.signatures.isNotNullOrEmpty()) {
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for (sig in info.signatures) {
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digest(sig.toByteArray(), algorithm)?.let { return it }
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}
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}
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return null
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}
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private fun digest(bytes: ByteArray, algorithm: String): String? {
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try {
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val md = MessageDigest.getInstance(algorithm)
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val digest = md.digest(bytes)
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val sb = StringBuilder(2 * digest.size)
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for (b in digest) {
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sb.append(String.format("%02x", b))
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}
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return sb.toString()
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} catch (e: NoSuchAlgorithmException) {
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return null
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}
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}
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}
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}
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