Require proper permission for togglePanel()/handleSystemKey()

In S, we're preventing apps from closing notification shade unless they
fall into certain exemptions. The methods togglePanel() and
handleSystemKey() weren't properly protected, so fixing that.

These methods were @hide, only available in the AIDL and their only
usages were inside the system

Introducing @TestApis to be able to verify this in CTS.

Bug: 192946152
Test: atest -d CtsAppTestCases:android.app.cts.StatusBarManagerTest
Test: atest -d CtsLegacyNotification30TestCases:android.app.notification.legacy30.cts.StatusBarManagerApi30Test
Test: 1. adb shell input keyevent KEYCODE_SYSTEM_NAVIGATION_DOWN
      2. Verify status bar expands
      3. adb shell input keyevent KEYCODE_SYSTEM_NAVIGATION_UP
      4. Verify status bar collapses

Change-Id: I925e3570c8d275a1159e4b6912e4628c9528cb61

core/api/test-current.txt

@@ -333,8 +333,10 @@ package android.app {
     method public void clickNotification(@Nullable String, int, int, boolean);
     method @RequiresPermission(android.Manifest.permission.STATUS_BAR) public void collapsePanels();
     method public void expandNotificationsPanel();
+    method @RequiresPermission(android.Manifest.permission.STATUS_BAR) public void handleSystemKey(int);
     method public void sendNotificationFeedback(@Nullable String, @Nullable android.os.Bundle);
     method @RequiresPermission(android.Manifest.permission.STATUS_BAR) public void setExpansionDisabledForSimNetworkLock(boolean);
+    method @RequiresPermission(android.Manifest.permission.STATUS_BAR) public void togglePanel();
   }
 
   public final class SyncNotedAppOp implements android.os.Parcelable {

core/java/android/app/StatusBarManager.java

@@ -351,6 +351,42 @@ public class StatusBarManager {
         }
     }
 
+    /**
+     * Toggles the notification panel.
+     *
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.STATUS_BAR)
+    @TestApi
+    public void togglePanel() {
+        try {
+            final IStatusBarService svc = getService();
+            if (svc != null) {
+                svc.togglePanel();
+            }
+        } catch (RemoteException ex) {
+            throw ex.rethrowFromSystemServer();
+        }
+    }
+
+    /**
+     * Sends system keys to the status bar.
+     *
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.STATUS_BAR)
+    @TestApi
+    public void handleSystemKey(int key) {
+        try {
+            final IStatusBarService svc = getService();
+            if (svc != null) {
+                svc.handleSystemKey(key);
+            }
+        } catch (RemoteException ex) {
+            throw ex.rethrowFromSystemServer();
+        }
+    }
+
     /**
      * Expand the settings panel.
      *

services/core/java/com/android/server/statusbar/StatusBarManagerService.java

@@ -671,20 +671,8 @@ public class StatusBarManagerService extends IStatusBarService.Stub implements D
 
     @Override
     public void collapsePanels() {
-        int uid = Binder.getCallingUid();
-        int pid = Binder.getCallingPid();
-        if (CompatChanges.isChangeEnabled(LOCK_DOWN_COLLAPSE_STATUS_BAR, uid)) {
-            enforceStatusBar();
-        } else {
-            if (mContext.checkPermission(Manifest.permission.STATUS_BAR, pid, uid)
-                    != PackageManager.PERMISSION_GRANTED) {
-                enforceExpandStatusBar();
-                if (!mActivityTaskManager.canCloseSystemDialogs(pid, uid)) {
-                    Slog.e(TAG, "Permission Denial: Method collapsePanels() requires permission "
-                            + Manifest.permission.STATUS_BAR + ", ignoring call.");
-                    return;
-                }
-            }
+        if (!checkCanCollapseStatusBar("collapsePanels")) {
+            return;
         }
 
         if (mBar != null) {
@@ -697,7 +685,9 @@ public class StatusBarManagerService extends IStatusBarService.Stub implements D
 
     @Override
     public void togglePanel() {
-        enforceExpandStatusBar();
+        if (!checkCanCollapseStatusBar("togglePanel")) {
+            return;
+        }
 
         if (isDisable2FlagSet(DISABLE2_NOTIFICATION_SHADE)) {
             return;
@@ -758,7 +748,9 @@ public class StatusBarManagerService extends IStatusBarService.Stub implements D
 
     @Override
     public void handleSystemKey(int key) throws RemoteException {
-        enforceExpandStatusBar();
+        if (!checkCanCollapseStatusBar("handleSystemKey")) {
+            return;
+        }
 
         if (mBar != null) {
             try {
@@ -1201,6 +1193,29 @@ public class StatusBarManagerService extends IStatusBarService.Stub implements D
                 "StatusBarManagerService");
     }
 
+    /**
+     *  For targetSdk S+ we require STATUS_BAR. For targetSdk < S, we only require EXPAND_STATUS_BAR
+     *  but also require that it falls into one of the allowed use-cases to lock down abuse vector.
+     */
+    private boolean checkCanCollapseStatusBar(String method) {
+        int uid = Binder.getCallingUid();
+        int pid = Binder.getCallingUid();
+        if (CompatChanges.isChangeEnabled(LOCK_DOWN_COLLAPSE_STATUS_BAR, uid)) {
+            enforceStatusBar();
+        } else {
+            if (mContext.checkPermission(Manifest.permission.STATUS_BAR, pid, uid)
+                    != PackageManager.PERMISSION_GRANTED) {
+                enforceExpandStatusBar();
+                if (!mActivityTaskManager.canCloseSystemDialogs(pid, uid)) {
+                    Slog.e(TAG, "Permission Denial: Method " + method + "() requires permission "
+                            + Manifest.permission.STATUS_BAR + ", ignoring call.");
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
     // ================================================================================
     // Callbacks from the status bar service.
     // ================================================================================