feat: biometric authentication in passcode activity

build.gradle

@@ -43,6 +43,7 @@ ext {
     lifecycleExtensionsVersion = '2.2.0'
     activity_version = '1.5.0'
     fragment_version = '1.5.0'
+    biometric = '1.1.0'
 
     // App dependencies
     supportLibraryVersion = '28.0.0'

mifospay/build.gradle

@@ -74,6 +74,8 @@ dependencies {
     implementation("androidx.lifecycle:lifecycle-runtime-compose:$lifecycle_version")
     implementation "androidx.compose.material:material-icons-extended:$compose_version"
 
+    // Biometric Authentication
+    implementation "androidx.biometric:biometric:$rootProject.biometric"
 
     // ViewModel
     implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"

mifospay/src/main/java/org/mifos/mobilewallet/mifospay/passcode/ui/PassCodeActivity.kt

@@ -3,9 +3,12 @@ package org.mifos.mobilewallet.mifospay.passcode.ui
 import android.content.Intent
 import android.net.Uri
 import android.os.Bundle
+import android.provider.Settings
 import androidx.appcompat.app.AlertDialog
 import android.view.View
 import android.widget.Toast
+import androidx.appcompat.widget.AppCompatButton
+import butterknife.BindView
 import butterknife.ButterKnife
 import com.mifos.mobile.passcode.MifosPassCodeActivity
 import com.mifos.mobile.passcode.utils.EncryptionUtil
@@ -19,6 +22,8 @@ import org.mifos.mobilewallet.mifospay.passcode.PassCodeContract
 import org.mifos.mobilewallet.mifospay.passcode.PassCodeContract.PassCodeView
 import org.mifos.mobilewallet.mifospay.passcode.presenter.PassCodePresenter
 import org.mifos.mobilewallet.mifospay.receipt.ui.ReceiptActivity
+import org.mifos.mobilewallet.mifospay.utils.BiometricAuthentication
+import org.mifos.mobilewallet.mifospay.utils.BiometricCapability
 import org.mifos.mobilewallet.mifospay.utils.Constants
 import javax.inject.Inject
 
@@ -36,9 +41,16 @@ class PassCodeActivity : MifosPassCodeActivity(), PassCodeView {
     private var currPass: String? = ""
     private var updatePassword = false
     private var isInitialScreen = false
+
+    @JvmField
+    @BindView(R.id.btn_save)
+    var btnSave: AppCompatButton? = null
+
+    private var biometricAuthentication: BiometricAuthentication? = null
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-
+        biometricAuthentication = BiometricAuthentication(this)
         // can't call getActivityComponent b/c PassCodeActivity class does not extend BaseActivity
 
         isInitialScreen = intent.getBooleanExtra(
@@ -50,6 +62,20 @@ class PassCodeActivity : MifosPassCodeActivity(), PassCodeView {
             updatePassword = intent.getBooleanExtra(Constants.UPDATE_PASSCODE, false)
         }
         ButterKnife.bind(this)
+        if (btnSave?.text?.equals(getString(R.string.use_touch_id)) == true) {
+            biometricAuthentication?.authenticateWithBiometrics()
+        }
+        if (biometricAuthentication?.getBiometricCapabilities() == BiometricCapability.HAS_BIOMETRIC_AUTH) {
+            if (btnSave?.visibility == View.GONE) {
+                btnSave?.visibility = View.VISIBLE
+                btnSave?.text = getString(R.string.use_touch_id)
+                btnSave?.setOnClickListener {
+                    biometricAuthentication?.authenticateWithBiometrics()
+                }
+            }
+        } else if (biometricAuthentication?.getBiometricCapabilities() == BiometricCapability.NOT_SUPPORTED) {
+            startActivity(Intent(Settings.ACTION_SECURITY_SETTINGS))
+        }
         deepLinkURI = intent.getStringExtra("uri")
     }
 
@@ -115,6 +141,13 @@ class PassCodeActivity : MifosPassCodeActivity(), PassCodeView {
         finish()
     }
 
+    override fun onResume() {
+        if (btnSave?.text?.equals(getString(R.string.use_touch_id)) == true) {
+            biometricAuthentication?.authenticateWithBiometrics()
+        }
+        super.onResume()
+    }
+
     override fun onBackPressed() {
         super.onBackPressed()
         saveCurrentPasscode()

mifospay/src/main/java/org/mifos/mobilewallet/mifospay/utils/BiometricAuthentication.kt

@@ -0,0 +1,78 @@
+package org.mifos.mobilewallet.mifospay.utils
+
+import android.content.Intent
+import android.os.Build
+import android.provider.Settings
+import android.provider.Settings.EXTRA_BIOMETRIC_AUTHENTICATORS_ALLOWED
+import androidx.activity.result.ActivityResultLauncher
+import androidx.biometric.BiometricManager
+import androidx.biometric.BiometricPrompt
+import androidx.core.content.ContextCompat
+import androidx.fragment.app.FragmentActivity
+import org.mifos.mobilewallet.mifospay.R
+import org.mifos.mobilewallet.mifospay.home.ui.MainActivity
+
+open class BiometricAuthentication(
+    val context: FragmentActivity,
+) {
+    private val executor = ContextCompat.getMainExecutor(context)
+    private val callback = object : BiometricPrompt.AuthenticationCallback() {
+
+        override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
+            super.onAuthenticationSucceeded(result)
+            val intent = Intent(context, MainActivity::class.java)
+            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
+            context.startActivity(intent)
+            context.finish()
+        }
+    }
+
+    private val biometricPrompt = BiometricPrompt(context, executor, callback)
+
+    fun launchBiometricEnrollment(resultLauncher: ActivityResultLauncher<Intent>) {
+        val intent: Intent = when {
+            Build.VERSION.SDK_INT >= Build.VERSION_CODES.R -> {
+                Intent(Settings.ACTION_BIOMETRIC_ENROLL).putExtra(
+                    EXTRA_BIOMETRIC_AUTHENTICATORS_ALLOWED,
+                    BiometricManager.Authenticators.BIOMETRIC_STRONG or BiometricManager.Authenticators.BIOMETRIC_WEAK,
+                )
+            }
+
+            Build.VERSION.SDK_INT >= Build.VERSION_CODES.P -> {
+                Intent(Settings.ACTION_FINGERPRINT_ENROLL)
+            }
+
+            else -> {
+                Intent(Settings.ACTION_SECURITY_SETTINGS)
+            }
+        }
+        resultLauncher.launch(intent)
+    }
+
+    fun getBiometricCapabilities(): BiometricCapability {
+        val biometricManager = BiometricManager.from(context)
+        return when (biometricManager.canAuthenticate(BiometricManager.Authenticators.BIOMETRIC_WEAK or BiometricManager.Authenticators.DEVICE_CREDENTIAL)) {
+            BiometricManager.BIOMETRIC_SUCCESS -> {
+                BiometricCapability.HAS_BIOMETRIC_AUTH
+            }
+
+            BiometricManager.BIOMETRIC_ERROR_NONE_ENROLLED -> {
+                BiometricCapability.NOT_ENROLLED
+            }
+
+            else -> {
+                BiometricCapability.NOT_SUPPORTED
+            }
+        }
+    }
+
+    fun authenticateWithBiometrics() {
+        val promptInfo = BiometricPrompt.PromptInfo.Builder().apply {
+            setTitle(context.getString(R.string.sign_in_fingerprint))
+            setDescription(context.getString(R.string.scan_your_fingerprint))
+            setAllowedAuthenticators(BiometricManager.Authenticators.BIOMETRIC_WEAK or BiometricManager.Authenticators.DEVICE_CREDENTIAL)
+        }.build()
+
+        biometricPrompt.authenticate(promptInfo)
+    }
+}

mifospay/src/main/java/org/mifos/mobilewallet/mifospay/utils/BiometricCapability.kt

@@ -0,0 +1,5 @@
+package org.mifos.mobilewallet.mifospay.utils
+
+enum class BiometricCapability {
+    HAS_BIOMETRIC_AUTH, NOT_ENROLLED, NOT_SUPPORTED
+}

mifospay/src/main/res/values/strings.xml

@@ -312,6 +312,9 @@
     <string name="pay">Pay</string>
     <string name="welcome_back">Welcome back!</string>
     <string name="sign_up">Sign up.</string>
+    <string name="sign_in_fingerprint">Sign in using fingerprint</string>
+    <string name="scan_your_fingerprint">Scan your fingerprint</string>
+    <string name="use_touch_id">Use Touch Id</string>
 
 
 </resources>