[PM-9409] Complete FIDO 2 assertion with appropriate response (#3615)

app/src/main/java/com/x8bit/bitwarden/data/autofill/fido2/model/Fido2CredentialAssertionResult.kt

@@ -0,0 +1,22 @@
+package com.x8bit.bitwarden.data.autofill.fido2.model
+
+/**
+ * Represents possible outcomes of a FIDO 2 credential assertion request.
+ */
+sealed class Fido2CredentialAssertionResult {
+
+    /**
+     * Indicates the assertion request completed and [responseJson] was successfully generated.
+     */
+    data class Success(val responseJson: String) : Fido2CredentialAssertionResult()
+
+    /**
+     * Indicates there was an error and the assertion was not successful.
+     */
+    data object Error : Fido2CredentialAssertionResult()
+
+    /**
+     * Indicates assertion was cancelled by the user.
+     */
+    data object Cancelled : Fido2CredentialAssertionResult()
+}

app/src/main/java/com/x8bit/bitwarden/ui/autofill/fido2/manager/Fido2CompletionManager.kt

@@ -1,5 +1,6 @@
 package com.x8bit.bitwarden.ui.autofill.fido2.manager
 
+import com.x8bit.bitwarden.data.autofill.fido2.model.Fido2CredentialAssertionResult
 import com.x8bit.bitwarden.data.autofill.fido2.model.Fido2RegisterCredentialResult
 
 /**
@@ -11,4 +12,9 @@ interface Fido2CompletionManager {
      * Completes the FIDO 2 registration process with the provided [result].
      */
     fun completeFido2Registration(result: Fido2RegisterCredentialResult)
+
+    /**
+     * Complete the FIDO 2 credential assertion process with the provided [result].
+     */
+    fun completeFido2Assertion(result: Fido2CredentialAssertionResult)
 }

app/src/main/java/com/x8bit/bitwarden/ui/autofill/fido2/manager/Fido2CompletionManagerImpl.kt

@@ -5,21 +5,25 @@ import android.content.Intent
 import android.os.Build
 import androidx.annotation.RequiresApi
 import androidx.credentials.CreatePublicKeyCredentialResponse
+import androidx.credentials.GetCredentialResponse
+import androidx.credentials.PublicKeyCredential
 import androidx.credentials.exceptions.CreateCredentialCancellationException
 import androidx.credentials.exceptions.CreateCredentialUnknownException
+import androidx.credentials.exceptions.GetCredentialCancellationException
+import androidx.credentials.exceptions.GetCredentialUnknownException
 import androidx.credentials.provider.PendingIntentHandler
+import com.x8bit.bitwarden.data.autofill.fido2.model.Fido2CredentialAssertionResult
 import com.x8bit.bitwarden.data.autofill.fido2.model.Fido2RegisterCredentialResult
-import com.x8bit.bitwarden.data.platform.annotation.OmitFromCoverage
 
 /**
- * Primary implementation of [Fido2CompletionManager].
+ * Primary implementation of [Fido2CompletionManager] when the build version is
+ * UPSIDE_DOWN_CAKE (34) or above.
  */
-@OmitFromCoverage
+@RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
 class Fido2CompletionManagerImpl(
     private val activity: Activity,
 ) : Fido2CompletionManager {
 
-    @RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
     override fun completeFido2Registration(result: Fido2RegisterCredentialResult) {
         activity.also {
             val intent = Intent()
@@ -54,4 +58,39 @@ class Fido2CompletionManagerImpl(
             it.finish()
         }
     }
+
+    override fun completeFido2Assertion(result: Fido2CredentialAssertionResult) {
+        activity.also {
+            val intent = Intent()
+            when (result) {
+                Fido2CredentialAssertionResult.Cancelled -> {
+                    PendingIntentHandler
+                        .setGetCredentialException(
+                            intent = intent,
+                            exception = GetCredentialCancellationException(),
+                        )
+                }
+
+                Fido2CredentialAssertionResult.Error -> {
+                    PendingIntentHandler
+                        .setGetCredentialException(
+                            intent = intent,
+                            exception = GetCredentialUnknownException(),
+                        )
+                }
+
+                is Fido2CredentialAssertionResult.Success -> {
+                    PendingIntentHandler
+                        .setGetCredentialResponse(
+                            intent = intent,
+                            response = GetCredentialResponse(
+                                credential = PublicKeyCredential(result.responseJson),
+                            ),
+                        )
+                }
+            }
+            it.setResult(Activity.RESULT_OK, intent)
+            it.finish()
+        }
+    }
 }

app/src/main/java/com/x8bit/bitwarden/ui/autofill/fido2/manager/Fido2CompletionManagerUnsupportedApiImpl.kt

@@ -0,0 +1,14 @@
+package com.x8bit.bitwarden.ui.autofill.fido2.manager
+
+import com.x8bit.bitwarden.data.autofill.fido2.model.Fido2CredentialAssertionResult
+import com.x8bit.bitwarden.data.autofill.fido2.model.Fido2RegisterCredentialResult
+
+/**
+ * A no-op implementation of [Fido2CompletionManagerImpl] provided when the build version is below
+ * UPSIDE_DOWN_CAKE (34). These versions do not support [androidx.credentials.CredentialProvider].
+ */
+object Fido2CompletionManagerUnsupportedApiImpl : Fido2CompletionManager {
+    override fun completeFido2Registration(result: Fido2RegisterCredentialResult) = Unit
+
+    override fun completeFido2Assertion(result: Fido2CredentialAssertionResult) = Unit
+}

app/src/main/java/com/x8bit/bitwarden/ui/platform/composition/LocalManagerProvider.kt

@@ -3,6 +3,7 @@
 package com.x8bit.bitwarden.ui.platform.composition
 
 import android.app.Activity
+import android.os.Build
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocal
 import androidx.compose.runtime.CompositionLocalProvider
@@ -10,8 +11,10 @@ import androidx.compose.runtime.ProvidableCompositionLocal
 import androidx.compose.runtime.compositionLocalOf
 import androidx.compose.ui.platform.LocalContext
 import com.x8bit.bitwarden.data.platform.annotation.OmitFromCoverage
+import com.x8bit.bitwarden.data.platform.util.isBuildVersionBelow
 import com.x8bit.bitwarden.ui.autofill.fido2.manager.Fido2CompletionManager
 import com.x8bit.bitwarden.ui.autofill.fido2.manager.Fido2CompletionManagerImpl
+import com.x8bit.bitwarden.ui.autofill.fido2.manager.Fido2CompletionManagerUnsupportedApiImpl
 import com.x8bit.bitwarden.ui.platform.manager.biometrics.BiometricsManager
 import com.x8bit.bitwarden.ui.platform.manager.biometrics.BiometricsManagerImpl
 import com.x8bit.bitwarden.ui.platform.manager.exit.ExitManager
@@ -29,13 +32,19 @@ import com.x8bit.bitwarden.ui.platform.manager.permissions.PermissionsManagerImp
 @Composable
 fun LocalManagerProvider(content: @Composable () -> Unit) {
     val activity = LocalContext.current as Activity
+    val fido2CompletionManager =
+        if (isBuildVersionBelow(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)) {
+            Fido2CompletionManagerUnsupportedApiImpl
+        } else {
+            Fido2CompletionManagerImpl(activity)
+        }
     CompositionLocalProvider(
         LocalPermissionsManager provides PermissionsManagerImpl(activity),
         LocalIntentManager provides IntentManagerImpl(activity),
         LocalExitManager provides ExitManagerImpl(activity),
         LocalBiometricsManager provides BiometricsManagerImpl(activity),
         LocalNfcManager provides NfcManagerImpl(activity),
-        LocalFido2CompletionManager provides Fido2CompletionManagerImpl(activity),
+        LocalFido2CompletionManager provides fido2CompletionManager,
     ) {
         content()
     }