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/*
* Copyright © 2014-2021 The Android Password Store Authors. All Rights Reserved.
* SPDX-License-Identifier: GPL-3.0-only
*/
package dev.msfjarvis.aps.ui.sshkeygen
import android.content.SharedPreferences
import android.os.Bundle
import android.security.keystore.UserNotAuthenticatedException
import android.view.MenuItem
import android.view.View
import android.view.inputmethod.InputMethodManager
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.edit
import androidx.core.content.getSystemService
import androidx.lifecycle.lifecycleScope
import com.github.michaelbull.result.fold
import com.github.michaelbull.result.runCatching
import com.google.android.material.dialog.MaterialAlertDialogBuilder
import dagger.hilt.android.AndroidEntryPoint
import dev.msfjarvis.aps.R
import dev.msfjarvis.aps.databinding.ActivitySshKeygenBinding
import dev.msfjarvis.aps.injection.prefs.GitPreferences
import dev.msfjarvis.aps.util.auth.BiometricAuthenticator
import dev.msfjarvis.aps.util.auth.BiometricAuthenticator.Result
import dev.msfjarvis.aps.util.extensions.keyguardManager
import dev.msfjarvis.aps.util.extensions.viewBinding
import dev.msfjarvis.aps.util.git.sshj.SshKey
import javax.inject.Inject
import kotlin.coroutines.resume
import kotlin.coroutines.suspendCoroutine
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
private enum class KeyGenType(val generateKey: suspend (requireAuthentication: Boolean) -> Unit) {
Rsa({ requireAuthentication ->
SshKey.generateKeystoreNativeKey(SshKey.Algorithm.Rsa, requireAuthentication)
}),
Ecdsa({ requireAuthentication ->
SshKey.generateKeystoreNativeKey(SshKey.Algorithm.Ecdsa, requireAuthentication)
}),
Ed25519({ requireAuthentication ->
SshKey.generateKeystoreWrappedEd25519Key(requireAuthentication)
}),
}
@AndroidEntryPoint
class SshKeyGenActivity : AppCompatActivity() {
private var keyGenType = KeyGenType.Ecdsa
private val binding by viewBinding(ActivitySshKeygenBinding::inflate)
@GitPreferences @Inject lateinit var gitPrefs: SharedPreferences
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(binding.root)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
with(binding) {
generate.setOnClickListener {
if (SshKey.exists) {
MaterialAlertDialogBuilder(this@SshKeyGenActivity).run {
setTitle(R.string.ssh_keygen_existing_title)
setMessage(R.string.ssh_keygen_existing_message)
setPositiveButton(R.string.ssh_keygen_existing_replace) { _, _ ->
lifecycleScope.launch { generate() }
}
setNegativeButton(R.string.ssh_keygen_existing_keep) { _, _ ->
setResult(RESULT_CANCELED)
finish()
}
show()
}
} else {
lifecycleScope.launch { generate() }
}
}
keyTypeGroup.check(R.id.key_type_ecdsa)
keyTypeExplanation.setText(R.string.ssh_keygen_explanation_ecdsa)
keyTypeGroup.addOnButtonCheckedListener { _, checkedId, isChecked ->
if (isChecked) {
keyGenType =
when (checkedId) {
R.id.key_type_ed25519 -> KeyGenType.Ed25519
R.id.key_type_ecdsa -> KeyGenType.Ecdsa
R.id.key_type_rsa -> KeyGenType.Rsa
else -> throw IllegalStateException("Impossible key type selection")
}
keyTypeExplanation.setText(
when (keyGenType) {
KeyGenType.Ed25519 -> R.string.ssh_keygen_explanation_ed25519
KeyGenType.Ecdsa -> R.string.ssh_keygen_explanation_ecdsa
KeyGenType.Rsa -> R.string.ssh_keygen_explanation_rsa
}
)
}
}
keyRequireAuthentication.isEnabled = keyguardManager.isDeviceSecure
keyRequireAuthentication.isChecked = keyRequireAuthentication.isEnabled
}
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
android.R.id.home -> {
onBackPressed()
true
}
else -> super.onOptionsItemSelected(item)
}
}
private suspend fun generate() {
binding.generate.apply {
text = getString(R.string.ssh_key_gen_generating_progress)
isEnabled = false
}
binding.generate.text = getString(R.string.ssh_key_gen_generating_progress)
val result = runCatching {
withContext(Dispatchers.IO) {
val requireAuthentication = binding.keyRequireAuthentication.isChecked
if (requireAuthentication) {
val result =
withContext(Dispatchers.Main) {
suspendCoroutine<Result> { cont ->
BiometricAuthenticator.authenticate(
this@SshKeyGenActivity,
R.string.biometric_prompt_title_ssh_keygen
) { result ->
// Do not cancel on failed attempts as these are handled by the
// authenticator UI.
if (result !is Result.Retry) cont.resume(result)
}
}
}
if (result !is Result.Success)
throw UserNotAuthenticatedException(getString(R.string.biometric_auth_generic_failure))
}
keyGenType.generateKey(requireAuthentication)
}
}
gitPrefs.edit { remove("ssh_key_local_passphrase") }
binding.generate.apply {
text = getString(R.string.ssh_keygen_generate)
isEnabled = true
}
result.fold(
success = { ShowSshKeyFragment().show(supportFragmentManager, "public_key") },
failure = { e ->
e.printStackTrace()
MaterialAlertDialogBuilder(this)
.setTitle(getString(R.string.error_generate_ssh_key))
.setMessage(getString(R.string.ssh_key_error_dialog_text) + e.message)
.setPositiveButton(getString(R.string.dialog_ok)) { _, _ ->
setResult(RESULT_OK)
finish()
}
.show()
},
)
hideKeyboard()
}
private fun hideKeyboard() {
val imm = getSystemService<InputMethodManager>() ?: return
var view = currentFocus
if (view == null) {
view = View(this)
}
imm.hideSoftInputFromWindow(view.windowToken, 0)
}
}
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