Prompt to save PIN to device password manager.

Fixes an issue where the system auto-fill could overwrite the Signal backup key saved to the device password manager with the Signal PIN. The PIN confirmation screen now explicitly uses `CredentialManager` to save the `Signal PIN` under a separate username from the `Signal Backups` key, allowing both credentials to be stored and auto-filled correctly.

- Add `com.google.android.libraries.identity.googleid` dependency so `CredentialManager` works on Android < 14.
- Prompt to save Signal PIN to credential manager after PIN is created/edited.

app/src/main/java/org/thoughtcrime/securesms/lock/v2/ConfirmSvrPinFragment.kt

@@ -8,6 +8,9 @@ import androidx.core.content.ContextCompat
 import androidx.core.view.ViewCompat
 import androidx.lifecycle.ViewModelProvider
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 import org.thoughtcrime.securesms.R
 import org.thoughtcrime.securesms.dependencies.AppDependencies
 import org.thoughtcrime.securesms.lock.v2.ConfirmSvrPinViewModel.SaveAnimation
@@ -15,6 +18,7 @@ import org.thoughtcrime.securesms.megaphone.Megaphones
 import org.thoughtcrime.securesms.registration.util.RegistrationUtil
 import org.thoughtcrime.securesms.storage.StorageSyncHelper
 import org.thoughtcrime.securesms.util.SpanUtil
+import org.thoughtcrime.securesms.util.storage.AndroidCredentialRepository
 
 internal class ConfirmSvrPinFragment : BaseSvrPinFragment<ConfirmSvrPinViewModel>() {
 
@@ -25,6 +29,8 @@ internal class ConfirmSvrPinFragment : BaseSvrPinFragment<ConfirmSvrPinViewModel
     } else {
       initializeViewStatesForPinCreate()
     }
+
+    ViewCompat.setImportantForAutofill(input, View.IMPORTANT_FOR_AUTOFILL_YES)
     ViewCompat.setAutofillHints(input, HintConstants.AUTOFILL_HINT_NEW_PASSWORD)
   }
 
@@ -64,6 +70,7 @@ internal class ConfirmSvrPinFragment : BaseSvrPinFragment<ConfirmSvrPinViewModel
         label.setText(R.string.ConfirmKbsPinFragment__creating_pin)
         input.isEnabled = false
       }
+
       ConfirmSvrPinViewModel.LabelState.RE_ENTER_PIN -> label.setText(R.string.ConfirmKbsPinFragment__re_enter_your_pin)
       ConfirmSvrPinViewModel.LabelState.PIN_DOES_NOT_MATCH -> {
         label.text = SpanUtil.color(
@@ -85,7 +92,9 @@ internal class ConfirmSvrPinFragment : BaseSvrPinFragment<ConfirmSvrPinViewModel
         closeNavGraphBranch()
         RegistrationUtil.maybeMarkRegistrationComplete()
         StorageSyncHelper.scheduleSyncForDataChange()
+        showSavePinToPasswordManagerPrompt()
       }
+
       SaveAnimation.FAILURE -> {
         confirm.cancelSpinning()
         RegistrationUtil.maybeMarkRegistrationComplete()
@@ -118,4 +127,14 @@ internal class ConfirmSvrPinFragment : BaseSvrPinFragment<ConfirmSvrPinViewModel
   private fun markMegaphoneSeenIfNecessary() {
     AppDependencies.megaphoneRepository.markSeen(Megaphones.Event.PINS_FOR_ALL)
   }
+
+  private fun showSavePinToPasswordManagerPrompt() {
+    CoroutineScope(Dispatchers.Main).launch {
+      AndroidCredentialRepository.saveCredential(
+        activityContext = requireActivity(),
+        username = getString(R.string.ConfirmKbsPinFragment__pin_password_manager_id),
+        password = input.text.toString()
+      )
+    }
+  }
 }

app/src/main/java/org/thoughtcrime/securesms/lock/v2/CreateSvrPinFragment.kt

@@ -4,9 +4,7 @@ import android.view.animation.Animation
 import android.view.animation.TranslateAnimation
 import android.widget.EditText
 import androidx.annotation.PluralsRes
-import androidx.autofill.HintConstants
 import androidx.core.content.ContextCompat
-import androidx.core.view.ViewCompat
 import androidx.lifecycle.ViewModelProvider
 import androidx.navigation.Navigation.findNavController
 import org.thoughtcrime.securesms.R
@@ -19,16 +17,15 @@ class CreateSvrPinFragment : BaseSvrPinFragment<CreateSvrPinViewModel?>() {
   override fun initializeViewStates() {
     val args = CreateSvrPinFragmentArgs.fromBundle(requireArguments())
     if (args.isPinChange) {
-      initializeViewStatesForPinChange(args.isForgotPin)
+      initializeViewStatesForPinChange()
     } else {
       initializeViewStatesForPinCreate()
     }
     label.text = getPinLengthRestrictionText(R.plurals.CreateKbsPinFragment__pin_must_be_at_least_digits)
     confirm.isEnabled = false
-    ViewCompat.setAutofillHints(input, HintConstants.AUTOFILL_HINT_NEW_PASSWORD)
   }
 
-  private fun initializeViewStatesForPinChange(isForgotPin: Boolean) {
+  private fun initializeViewStatesForPinChange() {
     title.setText(R.string.CreateKbsPinFragment__create_a_new_pin)
     description.setText(R.string.CreateKbsPinFragment__you_can_choose_a_new_pin_as_long_as_this_device_is_registered)
     description.setLearnMoreVisible(true)