[PM-22399] Send 2FA email when view appears (#5498)

Co-authored-by: Patrick Honkonen <1883101+SaintPatrck@users.noreply.github.com>

app/src/main/kotlin/com/x8bit/bitwarden/ui/auth/feature/twofactorlogin/TwoFactorLoginViewModel.kt

@@ -122,6 +122,13 @@ class TwoFactorLoginViewModel @Inject constructor(
             .map { TwoFactorLoginAction.Internal.ReceiveWebAuthResult(webAuthResult = it) }
             .onEach(::sendAction)
             .launchIn(viewModelScope)
+
+        viewModelScope.launch {
+            // If the auth method is email and it is not to verify the device, call resendEmail.
+            if (state.authMethod == TwoFactorAuthMethod.EMAIL && !state.isNewDeviceVerification) {
+                sendAction(TwoFactorLoginAction.Internal.SendVerificationCodeEmail)
+            }
+        }
     }
 
     override fun handleAction(action: TwoFactorLoginAction) {
@@ -159,6 +166,10 @@ class TwoFactorLoginViewModel @Inject constructor(
             is TwoFactorLoginAction.Internal.ReceiveResendEmailResult -> {
                 handleReceiveResendEmailResult(action)
             }
+
+            TwoFactorLoginAction.Internal.SendVerificationCodeEmail -> {
+                handleSendVerificationCodeEmail()
+            }
         }
     }
 
@@ -476,6 +487,20 @@ class TwoFactorLoginViewModel @Inject constructor(
      * Resend the verification code email.
      */
     private fun handleResendEmailClick() {
+        sendVerificationCodeEmail(isUserInitiated = true)
+    }
+
+    /**
+     * send the verification code email without user interaction.
+     */
+    private fun handleSendVerificationCodeEmail() {
+        sendVerificationCodeEmail(isUserInitiated = false)
+    }
+
+    /**
+     * Send the verification code email.
+     */
+    private fun sendVerificationCodeEmail(isUserInitiated: Boolean) {
         // Ensure that the user is in fact verifying with email.
         if (state.authMethod != TwoFactorAuthMethod.EMAIL) {
             return
@@ -500,7 +525,7 @@ class TwoFactorLoginViewModel @Inject constructor(
             sendAction(
                 TwoFactorLoginAction.Internal.ReceiveResendEmailResult(
                     resendEmailResult = result,
-                    isUserInitiated = true,
+                    isUserInitiated = isUserInitiated,
                 ),
             )
         }
@@ -821,5 +846,10 @@ sealed class TwoFactorLoginAction {
         data class ReceiveWebAuthResult(
             val webAuthResult: WebAuthResult,
         ) : Internal()
+
+        /**
+         * Indicates that the verification code email should be sent.
+         */
+        data object SendVerificationCodeEmail : Internal()
     }
 }

app/src/test/kotlin/com/x8bit/bitwarden/ui/auth/feature/twofactorlogin/TwoFactorLoginViewModelTest.kt

@@ -97,6 +97,64 @@ class TwoFactorLoginViewModelTest : BaseViewModelTest() {
         }
     }
 
+    @Test
+    fun `init with email auth method and not new device verification should call resendEmail`() {
+        val initialState = DEFAULT_STATE.copy(
+            authMethod = TwoFactorAuthMethod.EMAIL,
+            isNewDeviceVerification = false,
+        )
+        coEvery { authRepository.resendVerificationCodeEmail() } returns ResendEmailResult.Success
+
+        createViewModel(state = initialState)
+
+        coVerify(exactly = 1) {
+            authRepository.resendVerificationCodeEmail()
+        }
+    }
+
+    @Test
+    fun `init with email auth method and new device verification should not call resendEmail`() {
+        val initialState = DEFAULT_STATE.copy(
+            authMethod = TwoFactorAuthMethod.EMAIL,
+            isNewDeviceVerification = true,
+        )
+        coEvery { authRepository.resendVerificationCodeEmail() } returns ResendEmailResult.Success
+
+        createViewModel(state = initialState)
+
+        coVerify(exactly = 0) {
+            authRepository.resendVerificationCodeEmail()
+        }
+    }
+
+    @Test
+    @Suppress("MaxLineLength")
+    fun `init with non-email auth method and not new device verification should not call resendEmail`() {
+        val initialState = DEFAULT_STATE.copy(
+            authMethod = TwoFactorAuthMethod.AUTHENTICATOR_APP,
+            isNewDeviceVerification = false,
+        )
+        coEvery { authRepository.resendVerificationCodeEmail() } returns ResendEmailResult.Success
+
+        createViewModel(state = initialState)
+
+        coVerify(exactly = 0) {
+            authRepository.resendVerificationCodeEmail()
+        }
+    }
+
+    @Test
+    @Suppress("MaxLineLength")
+    fun `init with non-email auth method and new device verification should not call resendEmail`() {
+        val initialState = DEFAULT_STATE.copy(
+            authMethod = TwoFactorAuthMethod.AUTHENTICATOR_APP,
+            isNewDeviceVerification = true,
+        )
+        createViewModel(state = initialState)
+
+        coVerify(exactly = 0) { authRepository.resendVerificationCodeEmail() }
+    }
+
     @Test
     fun `yubiKeyResultFlow update should populate the input field and attempt login`() {
         val initialState = DEFAULT_STATE.copy(authMethod = TwoFactorAuthMethod.YUBI_KEY)
@@ -899,6 +957,27 @@ class TwoFactorLoginViewModelTest : BaseViewModelTest() {
         )
     }
 
+    @Test
+    @Suppress("MaxLineLength")
+    fun `sendVerificationCodeEmail with isUserInitiated false should not show loading and snackbar on success`() =
+        runTest {
+            coEvery { authRepository.resendVerificationCodeEmail() } returns ResendEmailResult.Success
+            val viewModel = createViewModel()
+            // Simulate initial email send (not user initiated)
+            viewModel.trySendAction(
+                TwoFactorLoginAction.Internal.ReceiveResendEmailResult(
+                    ResendEmailResult.Success,
+                    isUserInitiated = false,
+                ),
+            )
+            viewModel.stateEventFlow(backgroundScope) { stateFlow, eventFlow ->
+                // No loading dialog
+                assertEquals(DEFAULT_STATE, stateFlow.awaitItem())
+                // No snackbar
+                eventFlow.expectNoEvents()
+            }
+        }
+
     @Test
     fun `ResendEmailClick returns success should emit ShowSnackbar`() = runTest {
         coEvery {