Updated: always show the keyguard on device lockdown

Additionally, don't hide keyguard when it's disabled if the user has locked
down the device.

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
    4. Observe: user is brought to the keyguard, primary auth is
       required to enter the device.
       => After entering correct credential, the device is still in
          app pinning mode.
       => After entering an incorrect credential, the keyguard remains
          showing and the user can attempt again up to the limit

Bug: 300463732
Bug: 218495634
Test: atest KeyguardViewMediatorTest
Test: manual
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:faaf58d3b910c388b0a7c51dc370a7ae18e7cec2)
Merged-In: I70fdae80f717712b3dfc9df54b9649959b4bb8f0
Change-Id: I70fdae80f717712b3dfc9df54b9649959b4bb8f0

1 files changed, 14 insertions, 2 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java b/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java
index 60137804a066..6365171bc578 100644
--- a/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java
@@ -702,6 +702,13 @@ public class KeyguardViewMediator extends CoreStartable implements Dumpable,
                 }
             }
         }
+
+        @Override
+        public void onStrongAuthStateChanged(int userId) {
+            if (mLockPatternUtils.isUserInLockdown(KeyguardUpdateMonitor.getCurrentUser())) {
+                doKeyguardLocked(null);
+            }
+        }
     };
 
     ViewMediatorCallback mViewMediatorCallback = new ViewMediatorCallback() {
@@ -1550,6 +1557,10 @@ public class KeyguardViewMediator extends CoreStartable implements Dumpable,
             mExternallyEnabled = enabled;
 
             if (!enabled && mShowing) {
+                if (mLockPatternUtils.isUserInLockdown(KeyguardUpdateMonitor.getCurrentUser())) {
+                    Log.d(TAG, "keyguardEnabled(false) overridden by user lockdown");
+                    return;
+                }
                 if (mExitSecureCallback != null) {
                     if (DEBUG) Log.d(TAG, "in process of verifyUnlock request, ignoring");
                     // we're in the process of handling a request to verify the user
@@ -1775,8 +1786,9 @@ public class KeyguardViewMediator extends CoreStartable implements Dumpable,
             return;
         }
 
-        // if another app is disabling us, don't show
-        if (!mExternallyEnabled) {
+        // if another app is disabling us, don't show unless we're in lockdown mode
+        if (!mExternallyEnabled
+                && !mLockPatternUtils.isUserInLockdown(KeyguardUpdateMonitor.getCurrentUser())) {
             if (DEBUG) Log.d(TAG, "doKeyguard: not showing because externally disabled");
 
             mNeedToReshowWhenReenabled = true;