On device lockdown, always show the keyguard

Manual test steps:
1. Enable app pinning and disable "Ask for PIN before unpinning" setting
2. Pin an app (ie: Settings)
3. Lockdown from the power menu
Observe: user is brought to the keyguard, primary auth is required
to enter the device. After entering credential, the device is still in
app pinning mode.

Test: atest KeyguardViewMediatorTest
Test: manual steps outlined above
Bug: 218495634
Change-Id: I9a7c5e1acadabd4484e58573331f98dba895f2a2
Merged-In: I9a7c5e1acadabd4484e58573331f98dba895f2a2

packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java

@@ -726,6 +726,13 @@ public class KeyguardViewMediator implements CoreStartable, Dumpable,
                 }
             }
         }
+
+        @Override
+        public void onStrongAuthStateChanged(int userId) {
+            if (mLockPatternUtils.isUserInLockdown(KeyguardUpdateMonitor.getCurrentUser())) {
+                doKeyguardLocked(null);
+            }
+        }
     };
 
     ViewMediatorCallback mViewMediatorCallback = new ViewMediatorCallback() {
@@ -1949,8 +1956,9 @@ public class KeyguardViewMediator implements CoreStartable, Dumpable,
      * Enable the keyguard if the settings are appropriate.
      */
     private void doKeyguardLocked(Bundle options) {
-        // if another app is disabling us, don't show
+        // if another app is disabling us, don't show unless we're in lockdown mode
-        if (!mExternallyEnabled) {
+        if (!mExternallyEnabled
+                && !mLockPatternUtils.isUserInLockdown(KeyguardUpdateMonitor.getCurrentUser())) {
             if (DEBUG) Log.d(TAG, "doKeyguard: not showing because externally disabled");
 
             mNeedToReshowWhenReenabled = true;

packages/SystemUI/tests/src/com/android/systemui/keyguard/KeyguardViewMediatorTest.java

@@ -58,6 +58,7 @@ import com.android.internal.widget.LockPatternUtils;
 import com.android.keyguard.KeyguardDisplayManager;
 import com.android.keyguard.KeyguardSecurityView;
 import com.android.keyguard.KeyguardUpdateMonitor;
+import com.android.keyguard.KeyguardUpdateMonitorCallback;
 import com.android.keyguard.mediator.ScreenOnCoordinator;
 import com.android.systemui.DejankUtils;
 import com.android.systemui.SysuiTestCase;
@@ -98,6 +99,8 @@ import com.android.systemui.util.time.FakeSystemClock;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Captor;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
@@ -141,6 +144,8 @@ public class KeyguardViewMediatorTest extends SysuiTestCase {
     private @Mock AuthController mAuthController;
     private @Mock ShadeExpansionStateManager mShadeExpansionStateManager;
     private @Mock ShadeWindowLogger mShadeWindowLogger;
+    private @Captor ArgumentCaptor<KeyguardUpdateMonitorCallback>
+            mKeyguardUpdateMonitorCallbackCaptor;
     private DeviceConfigProxy mDeviceConfig = new DeviceConfigProxyFake();
     private FakeExecutor mUiBgExecutor = new FakeExecutor(new FakeSystemClock());
 
@@ -178,6 +183,24 @@ public class KeyguardViewMediatorTest extends SysuiTestCase {
         createAndStartViewMediator();
     }
 
+    @Test
+    public void onLockdown_showKeyguard_evenIfKeyguardIsNotEnabledExternally() {
+        // GIVEN keyguard is not enabled and isn't showing
+        mViewMediator.onSystemReady();
+        mViewMediator.setKeyguardEnabled(false);
+        TestableLooper.get(this).processAllMessages();
+        captureKeyguardUpdateMonitorCallback();
+        assertFalse(mViewMediator.isShowingAndNotOccluded());
+
+        // WHEN lockdown occurs
+        when(mLockPatternUtils.isUserInLockdown(anyInt())).thenReturn(true);
+        mKeyguardUpdateMonitorCallbackCaptor.getValue().onStrongAuthStateChanged(0);
+
+        // THEN keyguard is shown
+        TestableLooper.get(this).processAllMessages();
+        assertTrue(mViewMediator.isShowingAndNotOccluded());
+    }
+
     @Test
     public void testOnGoingToSleep_UpdatesKeyguardGoingAway() {
         mViewMediator.onStartedGoingToSleep(OFF_BECAUSE_OF_USER);
@@ -602,4 +625,8 @@ public class KeyguardViewMediatorTest extends SysuiTestCase {
 
         mViewMediator.registerCentralSurfaces(mCentralSurfaces, null, null, null, null, null);
     }
+
+    private void captureKeyguardUpdateMonitorCallback() {
+        verify(mUpdateMonitor).registerCallback(mKeyguardUpdateMonitorCallbackCaptor.capture());
+    }
 }