Add Biometric authentication for GUI Authentication Key

android/BOINC/app/build.gradle

@@ -437,6 +437,7 @@ dependencies {
     implementation AndroidX.recyclerView
     implementation AndroidX.swipeRefreshLayout
     implementation AndroidX.viewPager2
+    implementation("androidx.biometric:biometric:1.1.0")
 
     implementation 'javax.annotation:javax.annotation-api:_'
     implementation 'com.github.bumptech.glide:glide:_'

android/BOINC/app/src/main/java/edu/berkeley/boinc/SettingsFragment.kt

@@ -18,12 +18,26 @@
  */
 package edu.berkeley.boinc
 
+import android.content.Intent
 import android.content.SharedPreferences
 import android.os.Bundle
+import android.provider.Settings
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.EditText
 import android.widget.Toast
+import androidx.appcompat.app.AlertDialog
+import androidx.biometric.BiometricManager
+import androidx.biometric.BiometricManager.Authenticators.BIOMETRIC_STRONG
+import androidx.biometric.BiometricManager.Authenticators.BIOMETRIC_WEAK
+import androidx.biometric.BiometricManager.Authenticators.DEVICE_CREDENTIAL
+import androidx.biometric.BiometricPrompt
+import androidx.core.content.ContextCompat
 import androidx.core.content.edit
 import androidx.preference.CheckBoxPreference
 import androidx.preference.EditTextPreference
+import androidx.preference.Preference
 import androidx.preference.PreferenceCategory
 import androidx.preference.PreferenceFragmentCompat
 import androidx.preference.PreferenceManager
@@ -33,6 +47,7 @@
 import edu.berkeley.boinc.utils.Logging
 import edu.berkeley.boinc.utils.setAppTheme
 import java.io.File
+import java.util.concurrent.Executor
 import java.util.concurrent.ThreadLocalRandom
 import kotlin.streams.asSequence
 
@@ -43,7 +58,9 @@
     private val charPool : List<Char> = ('a'..'z') + ('A'..'Z') + ('0'..'9')
     private val passwordLength = 32
     private var authKey = ""
-
+    private lateinit var biometricPrompt: BiometricPrompt
+    private lateinit var authenticationPopupView: View
+    private lateinit var authenticationPopupEditText: EditText
 
     override fun onResume() {
         super.onResume()
@@ -96,13 +113,81 @@
             usedCpuCores?.max = hostInfo.noOfCPUs
         }
 
-        val preference = findPreference<EditTextPreference>("authenticationKey")!!
-        preference.setSummaryProvider {
+        authenticationPopupView = LayoutInflater.from(context).inflate(R.layout.authenticationkey_preference_dialog, null)
+        authenticationPopupEditText = authenticationPopupView.findViewById(R.id.authentication_key_input)
+
+        val preference = findPreference<Preference>("authenticationKey")!!
+
+        val executor: Executor = ContextCompat.getMainExecutor(requireContext())
+
+        biometricPrompt = BiometricPrompt(this, executor, object : BiometricPrompt.AuthenticationCallback() {
+            override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
+                super.onAuthenticationSucceeded(result)
+                preference.isEnabled = true
+                authenticationPopup(sharedPreferences)
+            }
+
+            override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
+                super.onAuthenticationError(errorCode, errString)
+                Toast.makeText(context, "Authentication Error", Toast.LENGTH_SHORT).show()
+            }
+        })
+
+        preference.summaryProvider = Preference.SummaryProvider<Preference> {
             getString(R.string.prefs_remote_boinc_relaunched) + '\n' +
-            setAsterisks(authKey.length)
+                    setAsterisks(authKey.length)
+        }
+
+        val biometricManager = BiometricManager.from(this.requireContext())
+
+        preference.setOnPreferenceClickListener {
+            when (biometricManager.canAuthenticate(BIOMETRIC_STRONG or BIOMETRIC_WEAK or DEVICE_CREDENTIAL)) {
+                BiometricManager.BIOMETRIC_SUCCESS -> {
+                    val promptInfo = BiometricPrompt.PromptInfo.Builder()
+                        .setTitle("Authenticate")
+                        .setSubtitle("Use biometric authentication to reveal or edit the authentication key.")
+                        .setAllowedAuthenticators(DEVICE_CREDENTIAL or BIOMETRIC_WEAK or BIOMETRIC_STRONG)
+                        .build()
+                    biometricPrompt.authenticate(promptInfo)
+                }
+                BiometricManager.BIOMETRIC_ERROR_NONE_ENROLLED -> {
+                    val enrollIntent = Intent(Settings.ACTION_BIOMETRIC_ENROLL).apply {
+                        putExtra(Settings.EXTRA_BIOMETRIC_AUTHENTICATORS_ALLOWED,
+                            BIOMETRIC_WEAK or DEVICE_CREDENTIAL)
+                    }
+                    startActivityForResult(enrollIntent, 0)
+                }
+                else -> authenticationPopup(sharedPreferences)
+            }
+            true
         }
     }
 
+    private fun authenticationPopup(sharedPreferences: SharedPreferences) {
+        val builder = AlertDialog.Builder(requireContext())
+
+        if (authenticationPopupView.parent != null) {
+            (authenticationPopupView.parent as ViewGroup).removeView(authenticationPopupView)
+        }
+
+        builder.setView(authenticationPopupView)
+
+        val currentAuthKey = sharedPreferences.getString("authenticationKey", "")!!
+        authenticationPopupEditText.setText(currentAuthKey)
+
+
+        builder.setPositiveButton("OK") { _, _ ->
+            val enteredText = authenticationPopupEditText.text.toString()
+            sharedPreferences.edit { putString("authenticationKey", enteredText) }
+        }
+
+        builder.setNegativeButton("Cancel") { dialog, _ ->
+            dialog.dismiss()
+        }
+
+        builder.create().show()
+    }
+
     override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences, key: String) {
         when (key) {
             // General
@@ -204,7 +289,6 @@
                 val currentAuthKey = sharedPreferences.getString(key, "")!!
                 if (currentAuthKey.isEmpty()) {
                     sharedPreferences.edit { putString(key, authKey) }
-                    findPreference<EditTextPreference>(key)?.text = authKey
                     Toast.makeText(activity, R.string.prefs_remote_empty_password, Toast.LENGTH_SHORT).show()
                 } else {
                     authKey = currentAuthKey
@@ -216,7 +300,7 @@
             "remoteEnable" -> {
                 val isRemote = sharedPreferences.getBoolean(key, false)
                 BOINCActivity.monitor!!.isRemote = isRemote
-                findPreference<EditTextPreference>("authenticationKey")?.isVisible = isRemote
+                findPreference<Preference>("authenticationKey")?.isVisible = isRemote
                 quitClient()
             }
 
@@ -267,7 +351,7 @@
         findPreference<PreferenceCategory>("debug")?.isVisible = showAdvanced
         findPreference<PreferenceCategory>("remote")?.isVisible = showAdvanced
         val isRemote = findPreference<CheckBoxPreference>("remoteEnable")?.isChecked
-        findPreference<EditTextPreference>("authenticationKey")?.isVisible = showAdvanced && isRemote == true
+        findPreference<Preference>("authenticationKey")?.isVisible = showAdvanced && isRemote == true
     }
 
     private fun writeClientPrefs(prefs: GlobalPreferences) {

android/BOINC/app/src/main/res/layout/authenticationkey_preference_dialog.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+    <TextView
+            style="@style/BackgroundDayNight"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:textAppearance="?android:attr/textAppearanceLarge"
+            android:textStyle="bold"
+            android:singleLine="true"
+            android:padding="20dp"
+            android:layout_marginBottom="20dp"
+            android:text="@string/prefs_remote_authentication_key"/>
+
+    <EditText
+            android:id="@+id/authentication_key_input"
+            android:inputType="text"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:layout_margin="5dp"
+            android:minHeight="50dp"
+            android:hint="@string/prefs_remote_authentication_key_input_hint"
+            android:minWidth="200dp"/>
+
+</LinearLayout>

android/BOINC/app/src/main/res/values-en/strings.xml

@@ -162,6 +162,7 @@
     <string name="prefs_other_store_at_least_x_days_of_work_header">Work unit buffer (days)</string>
     <string name="prefs_other_store_up_to_an_additional_x_days_of_work_header">Additional work unit buffer (days)</string>
     <string name="prefs_remote_authentication_key">GUI authentication key</string>
+    <string name="prefs_remote_authentication_key_input_hint">Authentication Key</string>
     <string name="prefs_remote_empty_password">Password update failed: value cannot be empty</string>
     <string name="prefs_remote_boinc_relaunched">The BOINC client will be relaunched after password change.</string>
     <string name="prefs_client_log_flags_header">BOINC client log flags</string>

android/BOINC/app/src/main/res/values/strings.xml

@@ -162,6 +162,7 @@
     <string name="prefs_other_store_at_least_x_days_of_work_header">Work unit buffer (days)</string>
     <string name="prefs_other_store_up_to_an_additional_x_days_of_work_header">Additional work unit buffer (days)</string>
     <string name="prefs_remote_authentication_key">GUI authentication key</string>
+    <string name="prefs_remote_authentication_key_input_hint">Authentication Key</string>
     <string name="prefs_remote_empty_password">Password update failed: value cannot be empty</string>
     <string name="prefs_remote_boinc_relaunched">The BOINC client will be relaunched after password change.</string>
     <string name="prefs_client_log_flags_header">BOINC client log flags</string>

android/BOINC/app/src/main/res/xml/root_preferences.xml

@@ -272,7 +272,7 @@
                 app:summary="@string/prefs_remote_summary"
                 app:title="@string/prefs_remote_header" />
 
-        <EditTextPreference
+        <Preference
                 app:iconSpaceReserved="false"
                 app:key="authenticationKey"
                 app:title="@string/prefs_remote_authentication_key"