Port location blacklist code to MR1.

I had to re-do this change for MR1 because LocationManagerService changed
so much. Here is the original change description:

Add package-name-prefix blacklist for location updates.

The Settings.Secure value locationPackagePrefixBlacklist and
locationPackagePrefixWhitelist contains comma seperated package-name
prefixes.

Location & geo-fence updates are silently dropped if the receiving
package name has a prefix on the blacklist. Status updates are
not affected. All other API's work as before.

A content observer is used so run-time updates to the blacklist
apply immediately. There is both a blacklist and a whitelist.
The blacklist applies first, and then exemptions are allowed
from the whitelist. In other words, if your package name prefix
matches both the black AND white list, then it is allowed.

Bug: 6986553
Change-Id: I1e151e08bd7143e47db005bc3fe9795076398df7

Author: Nick Pelly

location/java/android/location/ILocationManager.aidl

@@ -45,7 +45,7 @@ interface ILocationManager
             in PendingIntent intent, String packageName);
     void removeGeofence(in Geofence fence, in PendingIntent intent, String packageName);
 
-    Location getLastLocation(in LocationRequest request);
+    Location getLastLocation(in LocationRequest request, String packageName);
 
     boolean addGpsStatusListener(IGpsStatusListener listener);
     void removeGpsStatusListener(IGpsStatusListener listener);

location/java/android/location/LocationManager.java

@@ -1174,8 +1174,10 @@ public boolean isProviderEnabled(String provider) {
      * @throws SecurityException if no suitable permission is present
      */
     public Location getLastLocation() {
+        String packageName = mContext.getPackageName();
+
         try {
-            return mService.getLastLocation(null);
+            return mService.getLastLocation(null, packageName);
         } catch (RemoteException e) {
             Log.e(TAG, "RemoteException", e);
             return null;
@@ -1204,12 +1206,12 @@ public Location getLastLocation() {
     @Deprecated
     public Location getLastKnownLocation(String provider) {
         checkProvider(provider);
-
+        String packageName = mContext.getPackageName();
         LocationRequest request = LocationRequest.createFromDeprecatedProvider(
                 provider, 0, 0, true);
 
         try {
-            return mService.getLastLocation(request);
+            return mService.getLastLocation(request, packageName);
         } catch (RemoteException e) {
             Log.e(TAG, "RemoteException", e);
             return null;

services/java/com/android/server/LocationManagerService.java

@@ -63,6 +63,7 @@
 import com.android.server.location.GeocoderProxy;
 import com.android.server.location.GeofenceManager;
 import com.android.server.location.GpsLocationProvider;
+import com.android.server.location.LocationBlacklist;
 import com.android.server.location.LocationFudger;
 import com.android.server.location.LocationProviderInterface;
 import com.android.server.location.LocationProviderProxy;
@@ -132,8 +133,8 @@ public class LocationManagerService extends ILocationManager.Stub implements Obs
     private IGpsStatusProvider mGpsStatusProvider;
     private INetInitiatedListener mNetInitiatedListener;
     private LocationWorkerHandler mLocationHandler;
-    // track the passive provider for some special cases
-    private PassiveProvider mPassiveProvider;
+    private PassiveProvider mPassiveProvider;  // track passive provider for special cases
+    private LocationBlacklist mBlacklist;
 
     // --- fields below are protected by mWakeLock ---
     private int mPendingBroadcasts;
@@ -208,7 +209,9 @@ private void init() {
         synchronized (mLock) {
             loadProvidersLocked();
         }
-        mGeofenceManager = new GeofenceManager(mContext);
+        mBlacklist = new LocationBlacklist(mContext, mLocationHandler);
+        mBlacklist.init();
+        mGeofenceManager = new GeofenceManager(mContext, mBlacklist);
         mLocationFudger = new LocationFudger();
 
         // Register for Network (Wifi or Mobile) updates
@@ -1063,10 +1066,17 @@ private void removeUpdatesLocked(Receiver receiver) {
     }
 
     @Override
-    public Location getLastLocation(LocationRequest request) {
+    public Location getLastLocation(LocationRequest request, String packageName) {
         if (D) Log.d(TAG, "getLastLocation: " + request);
         if (request == null) request = DEFAULT_LOCATION_REQUEST;
         String perm = checkPermissionAndRequest(request);
+        checkPackageName(packageName);
+
+        if (mBlacklist.isBlacklisted(packageName)) {
+            if (D) Log.d(TAG, "not returning last loc for blacklisted app: " +
+                    packageName);
+            return null;
+        }
 
         synchronized (mLock) {
             // Figure out the provider. Either its explicitly request (deprecated API's),
@@ -1325,6 +1335,13 @@ private void handleLocationChangedLocked(Location location, boolean passive) {
         for (UpdateRecord r : records) {
             Receiver receiver = r.mReceiver;
             boolean receiverDead = false;
+
+            if (mBlacklist.isBlacklisted(receiver.mPackageName)) {
+                if (D) Log.d(TAG, "skipping loc update for blacklisted app: " +
+                        receiver.mPackageName);
+                continue;
+            }
+
             if (ACCESS_FINE_LOCATION.equals(receiver.mPermission)) {
                 location = lastLocation;  // use fine location
             } else {
@@ -1716,8 +1733,9 @@ protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
                 for (String i : mDisabledProviders) {
                     pw.println("    " + i);
                 }
-
             }
+            pw.append("  ");
+            mBlacklist.dump(pw);
             if (mMockProviders.size() > 0) {
                 pw.println("  Mock Providers:");
                 for (Map.Entry<String, MockProvider> i : mMockProviders.entrySet()) {

services/java/com/android/server/location/GeofenceManager.java

@@ -34,9 +34,13 @@
 import android.os.Looper;
 import android.os.PowerManager;
 import android.os.SystemClock;
+import android.util.Log;
+
+import com.android.server.LocationManagerService;
 
 public class GeofenceManager implements LocationListener, PendingIntent.OnFinished {
     private static final String TAG = "GeofenceManager";
+    private static final boolean D = LocationManagerService.D;
 
     /**
      * Assume a maximum land speed, as a heuristic to throttle location updates.
@@ -49,19 +53,21 @@ public class GeofenceManager implements LocationListener, PendingIntent.OnFinish
     private final LocationManager mLocationManager;
     private final PowerManager.WakeLock mWakeLock;
     private final Looper mLooper;  // looper thread to take location updates on
+    private final LocationBlacklist mBlacklist;
 
     private Object mLock = new Object();
 
     // access to members below is synchronized on mLock
     private Location mLastLocation;
     private List<GeofenceState> mFences = new LinkedList<GeofenceState>();
 
-    public GeofenceManager(Context context) {
+    public GeofenceManager(Context context, LocationBlacklist blacklist) {
         mContext = context;
         mLocationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
         PowerManager powerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
         mWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
         mLooper = Looper.myLooper();
+        mBlacklist = blacklist;
 
         LocationRequest request = new LocationRequest()
                 .setQuality(LocationRequest.POWER_NONE)
@@ -145,6 +151,12 @@ private void processLocation(Location location) {
             removeExpiredFencesLocked();
 
             for (GeofenceState state : mFences) {
+                if (mBlacklist.isBlacklisted(state.mPackageName)) {
+                    if (D) Log.d(TAG, "skipping geofence processing for blacklisted app: " +
+                            state.mPackageName);
+                    continue;
+                }
+
                 int event = state.processLocation(location);
                 if ((event & GeofenceState.FLAG_ENTER) != 0) {
                     enterIntents.add(state.mIntent);

services/java/com/android/server/location/LocationBlacklist.java

@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+package com.android.server.location;
+
+import android.content.Context;
+import android.database.ContentObserver;
+import android.os.Handler;
+import android.provider.Settings;
+import android.util.Log;
+import android.util.Slog;
+
+import com.android.server.LocationManagerService;
+
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.Arrays;
+
+/**
+ * Allows applications to be blacklisted from location updates at run-time.
+ *
+ * This is a silent blacklist. Applications can still call Location Manager
+ * API's, but they just won't receive any locations.
+ */
+public final class LocationBlacklist extends ContentObserver {
+    private static final String TAG = "LocationBlacklist";
+    private static final boolean D = LocationManagerService.D;
+    private static final String BLACKLIST_CONFIG_NAME = "locationPackagePrefixBlacklist";
+    private static final String WHITELIST_CONFIG_NAME = "locationPackagePrefixWhitelist";
+
+    private final Context mContext;
+    private final Object mLock = new Object();
+
+    // all fields below synchronized on mLock
+    private String[] mWhitelist = new String[0];
+    private String[] mBlacklist = new String[0];
+    
+    public LocationBlacklist(Context context, Handler handler) {
+        super(handler);
+        mContext = context;
+    }
+
+    public void init() {
+        mContext.getContentResolver().registerContentObserver(Settings.Secure.getUriFor(
+                BLACKLIST_CONFIG_NAME), false, this);
+//        mContext.getContentResolver().registerContentObserver(Settings.Secure.getUriFor(
+//                WHITELIST_CONFIG_NAME), false, this);
+        reloadBlacklist();
+    }
+
+    private void reloadBlacklist() {
+        String blacklist[] = getStringArray(BLACKLIST_CONFIG_NAME);
+        String whitelist[] = getStringArray(WHITELIST_CONFIG_NAME);
+        synchronized (mLock) {
+            mWhitelist = whitelist;
+            Slog.i(TAG, "whitelist: " + Arrays.toString(mWhitelist));
+            mBlacklist = blacklist;
+            Slog.i(TAG, "blacklist: " + Arrays.toString(mBlacklist));
+        }
+    }
+
+    /**
+     * Return true if in blacklist
+     * (package name matches blacklist, and does not match whitelist)
+     */
+    public boolean isBlacklisted(String packageName) {
+        synchronized (mLock) {
+            for (String black : mBlacklist) {
+                if (packageName.startsWith(black)) {
+                    if (inWhitelist(packageName)) {
+                        continue;
+                    } else {
+                        if (D) Log.d(TAG, "dropping location (blacklisted): "
+                                + packageName + " matches " + black);
+                        return true;
+                    }
+                }
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Return true if any of packages are in whitelist
+     */
+    private boolean inWhitelist(String pkg) {
+        synchronized (mLock) {
+            for (String white : mWhitelist) {
+                if (pkg.startsWith(white)) return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public void onChange(boolean selfChange) {
+        reloadBlacklist();
+    }
+
+    private String[] getStringArray(String key) {
+        String flatString = Settings.Secure.getString(mContext.getContentResolver(), key);
+        if (flatString == null) {
+            return new String[0];
+        }
+        String[] splitStrings = flatString.split(",");
+        ArrayList<String> result = new ArrayList<String>();
+        for (String pkg : splitStrings) {
+            pkg = pkg.trim();
+            if (pkg.isEmpty()) {
+                continue;
+            }
+            result.add(pkg);
+        }
+        return result.toArray(new String[result.size()]);
+    }
+
+    public void dump(PrintWriter pw) {
+        pw.println("mWhitelist=" + Arrays.toString(mWhitelist) + " mBlacklist=" +
+                Arrays.toString(mBlacklist));
+    }
+}