Block setting wallpapers from managed profiles.

Silently fail when a managed profile app tries to change the
wallpaper and return default values for getters in that case.
This is implemented through a new AppOp that is controlled by
a new user restriction that will be set during provisioning.

Bug: 18725052
Change-Id: I1601852617e738be86560f054daf3435dd9f5a9f

1 files changed, 44 insertions, 10 deletions

diff --git a/core/java/android/app/WallpaperManager.java b/core/java/android/app/WallpaperManager.java
index badb606..22e79b6 100644
--- a/core/java/android/app/WallpaperManager.java
+++ b/core/java/android/app/WallpaperManager.java
@@ -64,7 +64,10 @@ import java.util.List;
  * Provides access to the system wallpaper. With WallpaperManager, you can
  * get the current wallpaper, get the desired dimensions for the wallpaper, set
  * the wallpaper, and more. Get an instance of WallpaperManager with
- * {@link #getInstance(android.content.Context) getInstance()}. 
+ * {@link #getInstance(android.content.Context) getInstance()}.
+ *
+ * <p> An app can check whether wallpapers are supported for the current user, by calling
+ * {@link #isWallpaperSupported()}.
  */
 public class WallpaperManager {
     private static String TAG = "WallpaperManager";
@@ -249,6 +252,15 @@ public class WallpaperManager {
 
         public Bitmap peekWallpaperBitmap(Context context, boolean returnDefault) {
             synchronized (this) {
+                if (mService != null) {
+                    try {
+                        if (!mService.isWallpaperSupported(context.getOpPackageName())) {
+                            return null;
+                        }
+                    } catch (RemoteException e) {
+                        // Ignore
+                    }
+                }
                 if (mWallpaper != null) {
                     return mWallpaper;
                 }
@@ -618,7 +630,9 @@ public class WallpaperManager {
      * wallpaper will require reloading it again from disk.
      */
     public void forgetLoadedWallpaper() {
-        sGlobals.forgetLoadedWallpaper();
+        if (isWallpaperSupported()) {
+            sGlobals.forgetLoadedWallpaper();
+        }
     }
 
     /**
@@ -717,7 +731,7 @@ public class WallpaperManager {
             Resources resources = mContext.getResources();
             /* Set the wallpaper to the default values */
             ParcelFileDescriptor fd = sGlobals.mService.setWallpaper(
-                    "res:" + resources.getResourceName(resid));
+                    "res:" + resources.getResourceName(resid), mContext.getOpPackageName());
             if (fd != null) {
                 FileOutputStream fos = null;
                 try {
@@ -753,7 +767,8 @@ public class WallpaperManager {
             return;
         }
         try {
-            ParcelFileDescriptor fd = sGlobals.mService.setWallpaper(null);
+            ParcelFileDescriptor fd = sGlobals.mService.setWallpaper(null,
+                    mContext.getOpPackageName());
             if (fd == null) {
                 return;
             }
@@ -792,7 +807,8 @@ public class WallpaperManager {
             return;
         }
         try {
-            ParcelFileDescriptor fd = sGlobals.mService.setWallpaper(null);
+            ParcelFileDescriptor fd = sGlobals.mService.setWallpaper(null,
+                    mContext.getOpPackageName());
             if (fd == null) {
                 return;
             }
@@ -945,7 +961,8 @@ public class WallpaperManager {
             if (sGlobals.mService == null) {
                 Log.w(TAG, "WallpaperService not running");
             } else {
-                sGlobals.mService.setDimensionHints(minimumWidth, minimumHeight);
+                sGlobals.mService.setDimensionHints(minimumWidth, minimumHeight,
+                        mContext.getOpPackageName());
             }
         } catch (RemoteException e) {
             // Ignore
@@ -966,7 +983,7 @@ public class WallpaperManager {
             if (sGlobals.mService == null) {
                 Log.w(TAG, "WallpaperService not running");
             } else {
-                sGlobals.mService.setDisplayPadding(padding);
+                sGlobals.mService.setDisplayPadding(padding, mContext.getOpPackageName());
             }
         } catch (RemoteException e) {
             // Ignore
@@ -1006,7 +1023,7 @@ public class WallpaperManager {
             return;
         }
         try {
-            sGlobals.mService.clearWallpaper();
+            sGlobals.mService.clearWallpaper(mContext.getOpPackageName());
         } catch (RemoteException e) {
             // Ignore
         }
@@ -1027,7 +1044,7 @@ public class WallpaperManager {
             return false;
         }
         try {
-            sGlobals.mService.setWallpaperComponent(name);
+            sGlobals.mService.setWallpaperComponentChecked(name, mContext.getOpPackageName());
             return true;
         } catch (RemoteException e) {
             // Ignore
@@ -1096,7 +1113,24 @@ public class WallpaperManager {
             // Ignore.
         }
     }
-    
+
+    /**
+     * Returns whether wallpapers are supported for the calling user. If this function returns
+     * false, any attempts to changing the wallpaper will have no effect.
+     */
+    public boolean isWallpaperSupported() {
+        if (sGlobals.mService == null) {
+            Log.w(TAG, "WallpaperService not running");
+        } else {
+            try {
+                return sGlobals.mService.isWallpaperSupported(mContext.getOpPackageName());
+            } catch (RemoteException e) {
+                // Ignore
+            }
+        }
+        return false;
+    }
+
     /**
      * Clear the offsets previously associated with this window through
      * {@link #setWallpaperOffsets(IBinder, float, float)}.  This reverts