Merge changes from topic "autoconfirm" into udc-qpr-dev

* changes: Show auth failure animation for PIN bouncer Add support for auto-confirmed PINs
2023-06-19 12:43:51 +00:00
parent 77f154f470 3a68635d8a
commit e0abf2628f
11 changed files with 651 additions and 125 deletions
--- a/packages/SystemUI/compose/features/src/com/android/systemui/bouncer/ui/composable/PinBouncer.kt
+++ b/packages/SystemUI/compose/features/src/com/android/systemui/bouncer/ui/composable/PinBouncer.kt
@@ -21,11 +21,14 @@ package com.android.systemui.bouncer.ui.composable
 import android.view.HapticFeedbackConstants
 import androidx.compose.animation.ExperimentalAnimationApi
 import androidx.compose.animation.animateColorAsState
+import androidx.compose.animation.core.Animatable
 import androidx.compose.animation.core.AnimationSpec
+import androidx.compose.animation.core.AnimationVector1D
 import androidx.compose.animation.core.MutableTransitionState
 import androidx.compose.animation.core.Transition
 import androidx.compose.animation.core.animateDp
 import androidx.compose.animation.core.animateDpAsState
+import androidx.compose.animation.core.animateFloatAsState
 import androidx.compose.animation.core.keyframes
 import androidx.compose.animation.core.snap
 import androidx.compose.animation.core.tween
@@ -58,6 +61,7 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.drawBehind
 import androidx.compose.ui.geometry.CornerRadius
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.layout.Layout
 import androidx.compose.ui.platform.LocalView
@@ -67,6 +71,7 @@ import androidx.compose.ui.unit.dp
 import com.android.compose.animation.Easings
 import com.android.compose.grid.VerticalGrid
 import com.android.systemui.R
+import com.android.systemui.bouncer.ui.viewmodel.ActionButtonAppearance
 import com.android.systemui.bouncer.ui.viewmodel.EnteredKey
 import com.android.systemui.bouncer.ui.viewmodel.PinBouncerViewModel
 import com.android.systemui.common.shared.model.ContentDescription
@@ -76,6 +81,7 @@ import com.android.systemui.compose.modifiers.thenIf
 import kotlin.time.Duration.Companion.milliseconds
 import kotlin.time.DurationUnit
 import kotlinx.coroutines.async
+import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch

@@ -87,78 +93,13 @@ internal fun PinBouncer(
    // Report that the UI is shown to let the view-model run some logic.
    LaunchedEffect(Unit) { viewModel.onShown() }

-    val isInputEnabled: Boolean by viewModel.isInputEnabled.collectAsState()
-    val animateFailure: Boolean by viewModel.animateFailure.collectAsState()
-
-    // Show the failure animation if the user entered the wrong input.
-    LaunchedEffect(animateFailure) {
-        if (animateFailure) {
-            showFailureAnimation()
-            viewModel.onFailureAnimationShown()
-        }
-    }
-
    Column(
        horizontalAlignment = Alignment.CenterHorizontally,
        modifier = modifier,
    ) {
        PinInputDisplay(viewModel)
-
        Spacer(Modifier.height(100.dp))
-
-        VerticalGrid(
-            columns = 3,
-            verticalSpacing = 12.dp,
-            horizontalSpacing = 20.dp,
-        ) {
-            repeat(9) { index ->
-                val digit = index + 1
-                PinButton(
-                    onClicked = { viewModel.onPinButtonClicked(digit) },
-                    isEnabled = isInputEnabled,
-                ) { contentColor ->
-                    PinDigit(digit, contentColor)
-                }
-            }
-
-            PinButton(
-                onClicked = { viewModel.onBackspaceButtonClicked() },
-                onLongPressed = { viewModel.onBackspaceButtonLongPressed() },
-                isEnabled = isInputEnabled,
-                isIconButton = true,
-            ) { contentColor ->
-                PinIcon(
-                    Icon.Resource(
-                        res = R.drawable.ic_backspace_24dp,
-                        contentDescription =
-                            ContentDescription.Resource(R.string.keyboardview_keycode_delete),
-                    ),
-                    contentColor,
-                )
-            }
-
-            PinButton(
-                onClicked = { viewModel.onPinButtonClicked(0) },
-                isEnabled = isInputEnabled,
-            ) { contentColor ->
-                PinDigit(0, contentColor)
-            }
-
-            PinButton(
-                onClicked = { viewModel.onAuthenticateButtonClicked() },
-                isEnabled = isInputEnabled,
-                isIconButton = true,
-            ) { contentColor ->
-                PinIcon(
-                    Icon.Resource(
-                        res = R.drawable.ic_keyboard_tab_36dp,
-                        contentDescription =
-                            ContentDescription.Resource(R.string.keyboardview_keycode_enter),
-                    ),
-                    contentColor,
-                )
-            }
-        }
+        PinPad(viewModel)
    }
 }

@@ -305,38 +246,153 @@ private fun ObscuredInputEntry(transition: Transition<EntryVisibility>) {
 }

@Composable
-private fun PinDigit(
+private fun PinPad(viewModel: PinBouncerViewModel) {
+    val isInputEnabled: Boolean by viewModel.isInputEnabled.collectAsState()
+    val backspaceButtonAppearance by viewModel.backspaceButtonAppearance.collectAsState()
+    val confirmButtonAppearance by viewModel.confirmButtonAppearance.collectAsState()
+    val animateFailure: Boolean by viewModel.animateFailure.collectAsState()
+
+    val buttonScaleAnimatables = remember { List(12) { Animatable(1f) } }
+    LaunchedEffect(animateFailure) {
+        // Show the failure animation if the user entered the wrong input.
+        if (animateFailure) {
+            showFailureAnimation(buttonScaleAnimatables)
+            viewModel.onFailureAnimationShown()
+        }
+    }
+
+    VerticalGrid(
+        columns = 3,
+        verticalSpacing = 12.dp,
+        horizontalSpacing = 20.dp,
+    ) {
+        repeat(9) { index ->
+            DigitButton(
+                index + 1,
+                isInputEnabled,
+                viewModel::onPinButtonClicked,
+                buttonScaleAnimatables[index]::value,
+            )
+        }
+
+        ActionButton(
+            icon =
+                Icon.Resource(
+                    res = R.drawable.ic_backspace_24dp,
+                    contentDescription =
+                        ContentDescription.Resource(R.string.keyboardview_keycode_delete),
+                ),
+            isInputEnabled = isInputEnabled,
+            onClicked = viewModel::onBackspaceButtonClicked,
+            onLongPressed = viewModel::onBackspaceButtonLongPressed,
+            appearance = backspaceButtonAppearance,
+            scaling = buttonScaleAnimatables[9]::value,
+        )
+
+        DigitButton(
+            0,
+            isInputEnabled,
+            viewModel::onPinButtonClicked,
+            buttonScaleAnimatables[10]::value,
+        )
+
+        ActionButton(
+            icon =
+                Icon.Resource(
+                    res = R.drawable.ic_keyboard_tab_36dp,
+                    contentDescription =
+                        ContentDescription.Resource(R.string.keyboardview_keycode_enter),
+                ),
+            isInputEnabled = isInputEnabled,
+            onClicked = viewModel::onAuthenticateButtonClicked,
+            appearance = confirmButtonAppearance,
+            scaling = buttonScaleAnimatables[11]::value,
+        )
+    }
+}
+
+@Composable
+private fun DigitButton(
    digit: Int,
-    contentColor: Color,
+    isInputEnabled: Boolean,
+    onClicked: (Int) -> Unit,
+    scaling: () -> Float,
 ) {
-    // TODO(b/281878426): once "color: () -> Color" (added to BasicText in aosp/2568972) makes it
-    //  into Text, use that here, to animate more efficiently.
-    Text(
-        text = digit.toString(),
-        style = MaterialTheme.typography.headlineLarge,
-        color = contentColor,
-    )
+    PinPadButton(
+        onClicked = { onClicked(digit) },
+        isEnabled = isInputEnabled,
+        backgroundColor = MaterialTheme.colorScheme.surfaceVariant,
+        foregroundColor = MaterialTheme.colorScheme.onSurfaceVariant,
+        modifier =
+            Modifier.graphicsLayer {
+                val scale = scaling()
+                scaleX = scale
+                scaleY = scale
+            }
+    ) { contentColor ->
+        // TODO(b/281878426): once "color: () -> Color" (added to BasicText in aosp/2568972) makes
+        // it into Text, use that here, to animate more efficiently.
+        Text(
+            text = digit.toString(),
+            style = MaterialTheme.typography.headlineLarge,
+            color = contentColor(),
+        )
+    }
 }

@Composable
-private fun PinIcon(
+private fun ActionButton(
    icon: Icon,
-    contentColor: Color,
+    isInputEnabled: Boolean,
+    onClicked: () -> Unit,
+    onLongPressed: (() -> Unit)? = null,
+    appearance: ActionButtonAppearance,
+    scaling: () -> Float,
 ) {
-    Icon(
-        icon = icon,
-        tint = contentColor,
-    )
+    val isHidden = appearance == ActionButtonAppearance.Hidden
+    val hiddenAlpha by animateFloatAsState(if (isHidden) 0f else 1f, label = "Action button alpha")
+
+    val foregroundColor =
+        when (appearance) {
+            ActionButtonAppearance.Shown -> MaterialTheme.colorScheme.onSecondaryContainer
+            else -> MaterialTheme.colorScheme.onSurface
+        }
+    val backgroundColor =
+        when (appearance) {
+            ActionButtonAppearance.Shown -> MaterialTheme.colorScheme.secondaryContainer
+            else -> MaterialTheme.colorScheme.surface
+        }
+
+    PinPadButton(
+        onClicked = onClicked,
+        onLongPressed = onLongPressed,
+        isEnabled = isInputEnabled && !isHidden,
+        backgroundColor = backgroundColor,
+        foregroundColor = foregroundColor,
+        modifier =
+            Modifier.graphicsLayer {
+                alpha = hiddenAlpha
+                val scale = scaling()
+                scaleX = scale
+                scaleY = scale
+            }
+    ) { contentColor ->
+        Icon(
+            icon = icon,
+            tint = contentColor(),
+        )
+    }
 }

@Composable
-private fun PinButton(
+private fun PinPadButton(
    onClicked: () -> Unit,
    isEnabled: Boolean,
+    backgroundColor: Color,
+    foregroundColor: Color,
    modifier: Modifier = Modifier,
    onLongPressed: (() -> Unit)? = null,
-    isIconButton: Boolean = false,
-    content: @Composable (contentColor: Color) -> Unit,
+    content: @Composable (contentColor: () -> Color) -> Unit,
 ) {
    var isPressed: Boolean by remember { mutableStateOf(false) }

@@ -370,18 +426,16 @@ private fun PinButton(
        animateColorAsState(
            when {
                isPressed -> MaterialTheme.colorScheme.primary
-                isIconButton -> MaterialTheme.colorScheme.secondaryContainer
-                else -> MaterialTheme.colorScheme.surfaceVariant
+                else -> backgroundColor
            },
            label = "Pin button container color",
            animationSpec = colorAnimationSpec
        )
-    val contentColor: Color by
+    val contentColor =
        animateColorAsState(
            when {
                isPressed -> MaterialTheme.colorScheme.onPrimary
-                isIconButton -> MaterialTheme.colorScheme.onSecondaryContainer
-                else -> MaterialTheme.colorScheme.onSurfaceVariant
+                else -> foregroundColor
            },
            label = "Pin button container color",
            animationSpec = colorAnimationSpec
@@ -420,17 +474,46 @@ private fun PinButton(
                    }
                },
    ) {
-        content(contentColor)
+        content(contentColor::value)
    }
 }

-private fun showFailureAnimation() {
-    // TODO(b/282730134): implement.
+private suspend fun showFailureAnimation(
+    buttonScaleAnimatables: List<Animatable<Float, AnimationVector1D>>
+) {
+    coroutineScope {
+        buttonScaleAnimatables.forEachIndexed { index, animatable ->
+            launch {
+                animatable.animateTo(
+                    targetValue = pinButtonErrorShrinkFactor,
+                    animationSpec =
+                        tween(
+                            durationMillis = pinButtonErrorShrinkMs,
+                            delayMillis = index * pinButtonErrorStaggerDelayMs,
+                            easing = Easings.Linear,
+                        ),
+                )
+
+                animatable.animateTo(
+                    targetValue = 1f,
+                    animationSpec =
+                        tween(
+                            durationMillis = pinButtonErrorRevertMs,
+                            easing = Easings.Legacy,
+                        ),
+                )
+            }
+        }
+    }
 }

 private val entryShapeSize = 16.dp

 private val pinButtonSize = 84.dp
+private val pinButtonErrorShrinkFactor = 67.dp / pinButtonSize
+private const val pinButtonErrorShrinkMs = 50
+private const val pinButtonErrorStaggerDelayMs = 33
+private const val pinButtonErrorRevertMs = 617

 // Pin button motion spec: http://shortn/_9TTIG6SoEa
 private val pinButtonPressedDuration = 100.milliseconds
--- a/packages/SystemUI/src/com/android/systemui/authentication/data/repository/AuthenticationRepository.kt
+++ b/packages/SystemUI/src/com/android/systemui/authentication/data/repository/AuthenticationRepository.kt
@@ -77,7 +77,9 @@ class AuthenticationRepositoryImpl @Inject constructor() : AuthenticationReposit
    override val isUnlocked: StateFlow<Boolean> = _isUnlocked.asStateFlow()

    private val _authenticationMethod =
-        MutableStateFlow<AuthenticationMethodModel>(AuthenticationMethodModel.Pin(1234))
+        MutableStateFlow<AuthenticationMethodModel>(
+            AuthenticationMethodModel.Pin(listOf(1, 2, 3, 4), autoConfirm = false)
+        )
    override val authenticationMethod: StateFlow<AuthenticationMethodModel> =
        _authenticationMethod.asStateFlow()

--- a/packages/SystemUI/src/com/android/systemui/authentication/domain/interactor/AuthenticationInteractor.kt
+++ b/packages/SystemUI/src/com/android/systemui/authentication/domain/interactor/AuthenticationInteractor.kt
@@ -122,14 +122,36 @@ constructor(
    /**
     * Attempts to authenticate the user and unlock the device.
     *
+     * If [tryAutoConfirm] is `true`, authentication is attempted if and only if the auth method
+     * supports auto-confirming, and the input's length is at least the code's length. Otherwise,
+     * `null` is returned.
+     *
     * @param input The input from the user to try to authenticate with. This can be a list of
     *   different things, based on the current authentication method.
-     * @return `true` if the authentication succeeded and the device is now unlocked; `false`
-     *   otherwise.
+     * @param tryAutoConfirm `true` if called while the user inputs the code, without an explicit
+     *   request to validate.
+     * @return `true` if the authentication succeeded and the device is now unlocked; `false` when
+     *   authentication failed, `null` if the check was not performed.
     */
-    fun authenticate(input: List<Any>): Boolean {
+    fun authenticate(input: List<Any>, tryAutoConfirm: Boolean = false): Boolean? {
+        val authMethod = this.authenticationMethod.value
+        if (tryAutoConfirm) {
+            if ((authMethod as? AuthenticationMethodModel.Pin)?.autoConfirm != true) {
+                // Do not attempt to authenticate unless the PIN lock is set to auto-confirm.
+                return null
+            }
+
+            if (input.size < authMethod.code.size) {
+                // Do not attempt to authenticate if the PIN has not yet the required amount of
+                // digits. This intentionally only skip for shorter PINs; if the PIN is longer, the
+                // layer above might have throttled this check, and the PIN should be rejected via
+                // the auth code below.
+                return null
+            }
+        }
+
        val isSuccessful =
-            when (val authMethod = this.authenticationMethod.value) {
+            when (authMethod) {
                is AuthenticationMethodModel.Pin -> input.asCode() == authMethod.code
                is AuthenticationMethodModel.Password -> input.asPassword() == authMethod.password
                is AuthenticationMethodModel.Pattern -> input.asPattern() == authMethod.coordinates
@@ -180,21 +202,17 @@ constructor(
         * Returns a PIN code from the given list. It's assumed the given list elements are all
         * [Int] in the range [0-9].
         */
-        private fun List<Any>.asCode(): Long? {
+        private fun List<Any>.asCode(): List<Int>? {
            if (isEmpty() || size > DevicePolicyManager.MAX_PASSWORD_LENGTH) {
                return null
            }

-            var code = 0L
-            map {
-                    require(it is Int && it in 0..9) {
-                        "Pin is required to be Int in range [0..9], but got $it"
-                    }
-                    it
+            return map {
+                require(it is Int && it in 0..9) {
+                    "Pin is required to be Int in range [0..9], but got $it"
                }
-                .forEach { integer -> code = code * 10 + integer }
-
-            return code
+                it
+            }
        }

        /**
--- a/packages/SystemUI/src/com/android/systemui/authentication/shared/model/AuthenticationMethodModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/authentication/shared/model/AuthenticationMethodModel.kt
@@ -16,6 +16,8 @@

 package com.android.systemui.authentication.shared.model

+import androidx.annotation.VisibleForTesting
+
 /** Enumerates all known authentication methods. */
 sealed class AuthenticationMethodModel(
    /**
@@ -38,7 +40,16 @@ sealed class AuthenticationMethodModel(
     * In practice, a pin is restricted to 16 decimal digits , see
     * [android.app.admin.DevicePolicyManager.MAX_PASSWORD_LENGTH]
     */
-    data class Pin(val code: Long) : AuthenticationMethodModel(isSecure = true)
+    data class Pin(val code: List<Int>, val autoConfirm: Boolean) :
+        AuthenticationMethodModel(isSecure = true) {
+
+        /** Convenience constructor for tests only. */
+        @VisibleForTesting
+        constructor(
+            code: Long,
+            autoConfirm: Boolean = false
+        ) : this(code.toString(10).map { it - '0' }, autoConfirm) {}
+    }

    data class Password(val password: String) : AuthenticationMethodModel(isSecure = true)

--- a/packages/SystemUI/src/com/android/systemui/bouncer/domain/interactor/BouncerInteractor.kt
+++ b/packages/SystemUI/src/com/android/systemui/bouncer/domain/interactor/BouncerInteractor.kt
@@ -149,19 +149,28 @@ constructor(
     * If the input is correct, the device will be unlocked and the lock screen and bouncer will be
     * dismissed and hidden.
     *
+     * If [tryAutoConfirm] is `true`, authentication is attempted if and only if the auth method
+     * supports auto-confirming, and the input's length is at least the code's length. Otherwise,
+     * `null` is returned.
+     *
     * @param input The input from the user to try to authenticate with. This can be a list of
     *   different things, based on the current authentication method.
-     * @return `true` if the authentication succeeded and the device is now unlocked; `false`
-     *   otherwise.
+     * @param tryAutoConfirm `true` if called while the user inputs the code, without an explicit
+     *   request to validate.
+     * @return `true` if the authentication succeeded and the device is now unlocked; `false` when
+     *   authentication failed, `null` if the check was not performed.
     */
    fun authenticate(
        input: List<Any>,
-    ): Boolean {
+        tryAutoConfirm: Boolean = false,
+    ): Boolean? {
        if (repository.throttling.value != null) {
            return false
        }

-        val isAuthenticated = authenticationInteractor.authenticate(input)
+        val isAuthenticated =
+            authenticationInteractor.authenticate(input, tryAutoConfirm) ?: return null
+
        val failedAttempts = authenticationInteractor.failedAuthenticationAttempts.value
        when {
            isAuthenticated -> {
--- a/packages/SystemUI/src/com/android/systemui/bouncer/ui/viewmodel/PasswordBouncerViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/bouncer/ui/viewmodel/PasswordBouncerViewModel.kt
@@ -50,7 +50,7 @@ class PasswordBouncerViewModel(

    /** Notifies that the user has pressed the key for attempting to authenticate the password. */
    fun onAuthenticateKeyPressed() {
-        if (!interactor.authenticate(password.value.toCharArray().toList())) {
+        if (interactor.authenticate(password.value.toCharArray().toList()) != true) {
            showFailureAnimation()
        }

--- a/packages/SystemUI/src/com/android/systemui/bouncer/ui/viewmodel/PatternBouncerViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/bouncer/ui/viewmodel/PatternBouncerViewModel.kt
@@ -153,9 +153,8 @@ class PatternBouncerViewModel(

    /** Notifies that the user has ended the drag gesture across the dot grid. */
    fun onDragEnd() {
-        val isSuccessfullyAuthenticated =
-            interactor.authenticate(_selectedDots.value.map { it.toCoordinate() })
-        if (!isSuccessfullyAuthenticated) {
+        val pattern = _selectedDots.value.map { it.toCoordinate() }
+        if (interactor.authenticate(pattern) != true) {
            showFailureAnimation()
        }

--- a/packages/SystemUI/src/com/android/systemui/bouncer/ui/viewmodel/PinBouncerViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/bouncer/ui/viewmodel/PinBouncerViewModel.kt
@@ -16,14 +16,19 @@

 package com.android.systemui.bouncer.ui.viewmodel

+import com.android.systemui.authentication.shared.model.AuthenticationMethodModel
 import com.android.systemui.bouncer.domain.interactor.BouncerInteractor
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.stateIn

 /** Holds UI state and handles user input for the PIN code bouncer UI. */
 class PinBouncerViewModel(
-    private val applicationScope: CoroutineScope,
+    applicationScope: CoroutineScope,
    private val interactor: BouncerInteractor,
    isInputEnabled: StateFlow<Boolean>,
 ) :
@@ -34,6 +39,42 @@ class PinBouncerViewModel(
    private val mutablePinEntries = MutableStateFlow<List<EnteredKey>>(emptyList())
    val pinEntries: StateFlow<List<EnteredKey>> = mutablePinEntries

+    /** The length of the hinted PIN, or null if pin length hint should not be shown. */
+    val hintedPinLength: StateFlow<Int?> =
+        interactor.authenticationMethod
+            .map { authMethod -> computeHintedPinLength(authMethod) }
+            .stateIn(
+                scope = applicationScope,
+                started = SharingStarted.Eagerly,
+                initialValue = computeHintedPinLength(interactor.authenticationMethod.value),
+            )
+
+    /** Appearance of the backspace button. */
+    val backspaceButtonAppearance: StateFlow<ActionButtonAppearance> =
+        combine(interactor.authenticationMethod, mutablePinEntries) { authMethod, enteredPin ->
+                computeBackspaceButtonAppearance(authMethod, enteredPin)
+            }
+            .stateIn(
+                scope = applicationScope,
+                started = SharingStarted.Eagerly,
+                initialValue =
+                    computeBackspaceButtonAppearance(
+                        interactor.authenticationMethod.value,
+                        mutablePinEntries.value
+                    ),
+            )
+
+    /** Appearance of the confirm button. */
+    val confirmButtonAppearance: StateFlow<ActionButtonAppearance> =
+        interactor.authenticationMethod
+            .map { authMethod -> computeConfirmButtonAppearance(authMethod) }
+            .stateIn(
+                scope = applicationScope,
+                started = SharingStarted.Eagerly,
+                initialValue =
+                    computeConfirmButtonAppearance(interactor.authenticationMethod.value),
+            )
+
    /** Notifies that the UI has been shown to the user. */
    fun onShown() {
        interactor.resetMessage()
@@ -46,6 +87,8 @@ class PinBouncerViewModel(
        }

        mutablePinEntries.value += EnteredKey(input)
+
+        tryAuthenticate(useAutoConfirm = true)
    }

    /** Notifies that the user clicked the backspace button. */
@@ -63,14 +106,72 @@ class PinBouncerViewModel(

    /** Notifies that the user clicked the "enter" button. */
    fun onAuthenticateButtonClicked() {
-        if (!interactor.authenticate(mutablePinEntries.value.map { it.input })) {
+        tryAuthenticate(useAutoConfirm = false)
+    }
+
+    private fun tryAuthenticate(useAutoConfirm: Boolean) {
+        val pinCode = mutablePinEntries.value.map { it.input }
+        val isSuccess = interactor.authenticate(pinCode, useAutoConfirm) ?: return
+
+        if (!isSuccess) {
            showFailureAnimation()
        }

        mutablePinEntries.value = emptyList()
    }
+
+    private fun isAutoConfirmEnabled(authMethodModel: AuthenticationMethodModel): Boolean {
+        return (authMethodModel as? AuthenticationMethodModel.Pin)?.autoConfirm == true
+    }
+
+    private fun autoConfirmPinLength(authMethodModel: AuthenticationMethodModel): Int? {
+        if (!isAutoConfirmEnabled(authMethodModel)) return null
+
+        return (authMethodModel as? AuthenticationMethodModel.Pin)?.code?.size
+    }
+
+    private fun computeHintedPinLength(authMethodModel: AuthenticationMethodModel): Int? {
+        // Hinting is enabled for 6-digit codes only
+        return autoConfirmPinLength(authMethodModel).takeIf { it == HINTING_PASSCODE_LENGTH }
+    }
+
+    private fun computeBackspaceButtonAppearance(
+        authMethodModel: AuthenticationMethodModel,
+        enteredPin: List<EnteredKey>
+    ): ActionButtonAppearance {
+        val isAutoConfirmEnabled = isAutoConfirmEnabled(authMethodModel)
+        val isEmpty = enteredPin.isEmpty()
+
+        return when {
+            isAutoConfirmEnabled && isEmpty -> ActionButtonAppearance.Hidden
+            isAutoConfirmEnabled -> ActionButtonAppearance.Subtle
+            else -> ActionButtonAppearance.Shown
+        }
+    }
+    private fun computeConfirmButtonAppearance(
+        authMethodModel: AuthenticationMethodModel
+    ): ActionButtonAppearance {
+        return if (isAutoConfirmEnabled(authMethodModel)) {
+            ActionButtonAppearance.Hidden
+        } else {
+            ActionButtonAppearance.Shown
+        }
+    }
 }

+/** Appearance of pin-pad action buttons. */
+enum class ActionButtonAppearance {
+    /** Button must not be shown. */
+    Hidden,
+    /** Button is shown, but with no background to make it less prominent. */
+    Subtle,
+    /** Button is shown. */
+    Shown,
+}
+
+/** Auto-confirm passcodes of exactly 6 digits show a length hint, see http://shortn/_IXlmSNbDh6 */
+private const val HINTING_PASSCODE_LENGTH = 6
+
 private var nextSequenceNumber = 1

 /**
--- a/packages/SystemUI/tests/src/com/android/systemui/authentication/domain/interactor/AuthenticationInteractorTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/authentication/domain/interactor/AuthenticationInteractorTest.kt
@@ -336,6 +336,110 @@ class AuthenticationInteractorTest : SysuiTestCase() {
            assertThat(failedAttemptCount).isEqualTo(1)
        }

+    @Test
+    fun tryAutoConfirm_withAutoConfirmPinAndEmptyInput_returnsNullAndHasNoEffect() =
+        testScope.runTest {
+            val failedAttemptCount by collectLastValue(underTest.failedAuthenticationAttempts)
+            val isUnlocked by collectLastValue(underTest.isUnlocked)
+            underTest.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = true)
+            )
+            assertThat(isUnlocked).isFalse()
+
+            assertThat(underTest.authenticate(listOf(), tryAutoConfirm = true)).isNull()
+            assertThat(isUnlocked).isFalse()
+            assertThat(failedAttemptCount).isEqualTo(0)
+        }
+
+    @Test
+    fun tryAutoConfirm_withAutoConfirmPinAndShorterPin_returnsNullAndHasNoEffect() =
+        testScope.runTest {
+            val failedAttemptCount by collectLastValue(underTest.failedAuthenticationAttempts)
+            val isUnlocked by collectLastValue(underTest.isUnlocked)
+            underTest.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = true)
+            )
+            assertThat(isUnlocked).isFalse()
+
+            assertThat(underTest.authenticate(listOf(1, 2, 3), tryAutoConfirm = true)).isNull()
+            assertThat(isUnlocked).isFalse()
+            assertThat(failedAttemptCount).isEqualTo(0)
+        }
+
+    @Test
+    fun tryAutoConfirm_withAutoConfirmWrongPinCorrectLength_returnsFalseAndDoesNotUnlockDevice() =
+        testScope.runTest {
+            val failedAttemptCount by collectLastValue(underTest.failedAuthenticationAttempts)
+            val isUnlocked by collectLastValue(underTest.isUnlocked)
+            underTest.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = true)
+            )
+            assertThat(isUnlocked).isFalse()
+
+            assertThat(underTest.authenticate(listOf(1, 2, 4, 4), tryAutoConfirm = true)).isFalse()
+            assertThat(isUnlocked).isFalse()
+            assertThat(failedAttemptCount).isEqualTo(1)
+        }
+
+    @Test
+    fun tryAutoConfirm_withAutoConfirmLongerPin_returnsFalseAndDoesNotUnlockDevice() =
+        testScope.runTest {
+            val failedAttemptCount by collectLastValue(underTest.failedAuthenticationAttempts)
+            val isUnlocked by collectLastValue(underTest.isUnlocked)
+            underTest.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = true)
+            )
+            assertThat(isUnlocked).isFalse()
+
+            assertThat(underTest.authenticate(listOf(1, 2, 3, 4, 5), tryAutoConfirm = true))
+                .isFalse()
+            assertThat(isUnlocked).isFalse()
+            assertThat(failedAttemptCount).isEqualTo(1)
+        }
+
+    @Test
+    fun tryAutoConfirm_withAutoConfirmCorrectPin_returnsTrueAndUnlocksDevice() =
+        testScope.runTest {
+            val failedAttemptCount by collectLastValue(underTest.failedAuthenticationAttempts)
+            val isUnlocked by collectLastValue(underTest.isUnlocked)
+            underTest.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = true)
+            )
+            assertThat(isUnlocked).isFalse()
+
+            assertThat(underTest.authenticate(listOf(1, 2, 4, 4), tryAutoConfirm = true)).isFalse()
+            assertThat(isUnlocked).isFalse()
+            assertThat(failedAttemptCount).isEqualTo(1)
+        }
+
+    @Test
+    fun tryAutoConfirm_withoutAutoConfirmButCorrectPin_returnsNullAndHasNoEffects() =
+        testScope.runTest {
+            val failedAttemptCount by collectLastValue(underTest.failedAuthenticationAttempts)
+            val isUnlocked by collectLastValue(underTest.isUnlocked)
+            underTest.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = false)
+            )
+            assertThat(isUnlocked).isFalse()
+
+            assertThat(underTest.authenticate(listOf(1, 2, 3, 4), tryAutoConfirm = true)).isNull()
+            assertThat(isUnlocked).isFalse()
+            assertThat(failedAttemptCount).isEqualTo(0)
+        }
+
+    @Test
+    fun tryAutoConfirm_withoutCorrectPassword_returnsNullAndHasNoEffects() =
+        testScope.runTest {
+            val failedAttemptCount by collectLastValue(underTest.failedAuthenticationAttempts)
+            val isUnlocked by collectLastValue(underTest.isUnlocked)
+            underTest.setAuthenticationMethod(AuthenticationMethodModel.Password("password"))
+            assertThat(isUnlocked).isFalse()
+
+            assertThat(underTest.authenticate("password".toList(), tryAutoConfirm = true)).isNull()
+            assertThat(isUnlocked).isFalse()
+            assertThat(failedAttemptCount).isEqualTo(0)
+        }
+
    @Test
    fun unlocksDevice_whenAuthMethodBecomesNone() =
        testScope.runTest {
--- a/packages/SystemUI/tests/src/com/android/systemui/bouncer/domain/interactor/BouncerInteractorTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/bouncer/domain/interactor/BouncerInteractorTest.kt
@@ -94,6 +94,61 @@ class BouncerInteractorTest : SysuiTestCase() {
            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Gone))
        }

+    @Test
+    fun pinAuthMethod_tryAutoConfirm_withAutoConfirmPin() =
+        testScope.runTest {
+            val currentScene by collectLastValue(sceneInteractor.currentScene("container1"))
+            val message by collectLastValue(underTest.message)
+
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = true)
+            )
+            authenticationInteractor.lockDevice()
+            underTest.showOrUnlockDevice("container1")
+            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Bouncer))
+            assertThat(message).isEqualTo(MESSAGE_ENTER_YOUR_PIN)
+            underTest.clearMessage()
+
+            // Incomplete input.
+            assertThat(underTest.authenticate(listOf(1, 2), tryAutoConfirm = true)).isNull()
+            assertThat(message).isEmpty()
+            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Bouncer))
+
+            // Wrong 4-digit pin
+            assertThat(underTest.authenticate(listOf(1, 2, 3, 5), tryAutoConfirm = true)).isFalse()
+            assertThat(message).isEqualTo(MESSAGE_WRONG_PIN)
+            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Bouncer))
+
+            // Correct input.
+            assertThat(underTest.authenticate(listOf(1, 2, 3, 4), tryAutoConfirm = true)).isTrue()
+            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Gone))
+        }
+
+    @Test
+    fun pinAuthMethod_tryAutoConfirm_withoutAutoConfirmPin() =
+        testScope.runTest {
+            val currentScene by collectLastValue(sceneInteractor.currentScene("container1"))
+            val message by collectLastValue(underTest.message)
+
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = false)
+            )
+            authenticationInteractor.lockDevice()
+            underTest.showOrUnlockDevice("container1")
+            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Bouncer))
+            underTest.clearMessage()
+
+            // Incomplete input.
+            assertThat(underTest.authenticate(listOf(1, 2), tryAutoConfirm = true)).isNull()
+            assertThat(message).isEmpty()
+            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Bouncer))
+
+            // Correct input.
+            assertThat(underTest.authenticate(listOf(1, 2, 3, 4), tryAutoConfirm = true)).isNull()
+            assertThat(message).isEmpty()
+            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Bouncer))
+        }
+
    @Test
    fun passwordAuthMethod() =
        testScope.runTest {
--- a/packages/SystemUI/tests/src/com/android/systemui/bouncer/ui/viewmodel/PinBouncerViewModelTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/bouncer/ui/viewmodel/PinBouncerViewModelTest.kt
@@ -25,7 +25,6 @@ import com.android.systemui.coroutines.collectLastValue
 import com.android.systemui.scene.SceneTestUtils
 import com.android.systemui.scene.shared.model.SceneKey
 import com.android.systemui.scene.shared.model.SceneModel
-import com.google.common.truth.Correspondence
 import com.google.common.truth.Truth.assertThat
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -286,15 +285,160 @@ class PinBouncerViewModelTest : SysuiTestCase() {
            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Gone))
        }

+    @Test
+    fun onAutoConfirm_whenCorrect() =
+        testScope.runTest {
+            val isUnlocked by collectLastValue(authenticationInteractor.isUnlocked)
+            val currentScene by collectLastValue(sceneInteractor.currentScene(CONTAINER_NAME))
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = true)
+            )
+            authenticationInteractor.lockDevice()
+            sceneInteractor.setCurrentScene(CONTAINER_NAME, SceneModel(SceneKey.Bouncer))
+            assertThat(isUnlocked).isFalse()
+            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Bouncer))
+            underTest.onShown()
+            underTest.onPinButtonClicked(1)
+            underTest.onPinButtonClicked(2)
+            underTest.onPinButtonClicked(3)
+            underTest.onPinButtonClicked(4)
+
+            assertThat(isUnlocked).isTrue()
+            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Gone))
+        }
+
+    @Test
+    fun onAutoConfirm_whenWrong() =
+        testScope.runTest {
+            val isUnlocked by collectLastValue(authenticationInteractor.isUnlocked)
+            val currentScene by collectLastValue(sceneInteractor.currentScene(CONTAINER_NAME))
+            val message by collectLastValue(bouncerViewModel.message)
+            val entries by collectLastValue(underTest.pinEntries)
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = true)
+            )
+            authenticationInteractor.lockDevice()
+            sceneInteractor.setCurrentScene(CONTAINER_NAME, SceneModel(SceneKey.Bouncer))
+            assertThat(isUnlocked).isFalse()
+            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Bouncer))
+            underTest.onShown()
+            underTest.onPinButtonClicked(1)
+            underTest.onPinButtonClicked(2)
+            underTest.onPinButtonClicked(3)
+            underTest.onPinButtonClicked(5) // PIN is now wrong!
+
+            assertThat(entries).hasSize(0)
+            assertThat(message?.text).isEqualTo(WRONG_PIN)
+            assertThat(isUnlocked).isFalse()
+            assertThat(currentScene).isEqualTo(SceneModel(SceneKey.Bouncer))
+        }
+
+    @Test
+    fun backspaceButtonAppearance_withoutAutoConfirm_alwaysShown() =
+        testScope.runTest {
+            val backspaceButtonAppearance by collectLastValue(underTest.backspaceButtonAppearance)
+
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = false)
+            )
+
+            assertThat(backspaceButtonAppearance).isEqualTo(ActionButtonAppearance.Shown)
+        }
+
+    @Test
+    fun backspaceButtonAppearance_withAutoConfirmButNoInput_isHidden() =
+        testScope.runTest {
+            val backspaceButtonAppearance by collectLastValue(underTest.backspaceButtonAppearance)
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = true)
+            )
+
+            assertThat(backspaceButtonAppearance).isEqualTo(ActionButtonAppearance.Hidden)
+        }
+
+    @Test
+    fun backspaceButtonAppearance_withAutoConfirmAndInput_isShownQuiet() =
+        testScope.runTest {
+            val backspaceButtonAppearance by collectLastValue(underTest.backspaceButtonAppearance)
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = true)
+            )
+
+            underTest.onPinButtonClicked(1)
+
+            assertThat(backspaceButtonAppearance).isEqualTo(ActionButtonAppearance.Subtle)
+        }
+
+    @Test
+    fun confirmButtonAppearance_withoutAutoConfirm_alwaysShown() =
+        testScope.runTest {
+            val confirmButtonAppearance by collectLastValue(underTest.confirmButtonAppearance)
+
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = false)
+            )
+
+            assertThat(confirmButtonAppearance).isEqualTo(ActionButtonAppearance.Shown)
+        }
+
+    @Test
+    fun confirmButtonAppearance_withAutoConfirm_isHidden() =
+        testScope.runTest {
+            val confirmButtonAppearance by collectLastValue(underTest.confirmButtonAppearance)
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = true)
+            )
+
+            assertThat(confirmButtonAppearance).isEqualTo(ActionButtonAppearance.Hidden)
+        }
+
+    @Test
+    fun hintedPinLength_withoutAutoConfirm_isNull() =
+        testScope.runTest {
+            val hintedPinLength by collectLastValue(underTest.hintedPinLength)
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234, autoConfirm = false)
+            )
+
+            assertThat(hintedPinLength).isNull()
+        }
+
+    @Test
+    fun hintedPinLength_withAutoConfirmPinLessThanSixDigits_isNull() =
+        testScope.runTest {
+            val hintedPinLength by collectLastValue(underTest.hintedPinLength)
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(12345, autoConfirm = true)
+            )
+
+            assertThat(hintedPinLength).isNull()
+        }
+
+    @Test
+    fun hintedPinLength_withAutoConfirmPinExactlySixDigits_isSix() =
+        testScope.runTest {
+            val hintedPinLength by collectLastValue(underTest.hintedPinLength)
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(123456, autoConfirm = true)
+            )
+
+            assertThat(hintedPinLength).isEqualTo(6)
+        }
+
+    @Test
+    fun hintedPinLength_withAutoConfirmPinMoreThanSixDigits_isNull() =
+        testScope.runTest {
+            val hintedPinLength by collectLastValue(underTest.hintedPinLength)
+            authenticationInteractor.setAuthenticationMethod(
+                AuthenticationMethodModel.Pin(1234567, autoConfirm = true)
+            )
+
+            assertThat(hintedPinLength).isNull()
+        }
+
    companion object {
        private const val CONTAINER_NAME = "container1"
        private const val ENTER_YOUR_PIN = "Enter your pin"
        private const val WRONG_PIN = "Wrong pin"
-
-        val KEY_CODE =
-            Correspondence.transforming<EnteredKey, Int>(
-                { it?.input },
-                "has a eventId of",
-            )
    }
 }