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/*
* 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.os.UserHandle;
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];
private int mCurrentUserId = UserHandle.USER_OWNER;
public LocationBlacklist(Context context, Handler handler) {
super(handler);
mContext = context;
}
public void init() {
mContext.getContentResolver().registerContentObserver(Settings.Secure.getUriFor(
BLACKLIST_CONFIG_NAME), false, this, UserHandle.USER_ALL);
// mContext.getContentResolver().registerContentObserver(Settings.Secure.getUriFor(
// WHITELIST_CONFIG_NAME), false, this, UserHandle.USER_ALL);
reloadBlacklist();
}
private void reloadBlacklistLocked() {
mWhitelist = getStringArrayLocked(WHITELIST_CONFIG_NAME);
if (D) Slog.d(TAG, "whitelist: " + Arrays.toString(mWhitelist));
mBlacklist = getStringArrayLocked(BLACKLIST_CONFIG_NAME);
if (D) Slog.d(TAG, "blacklist: " + Arrays.toString(mBlacklist));
}
private void reloadBlacklist() {
synchronized (mLock) {
reloadBlacklistLocked();
}
}
/**
* 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();
}
public void switchUser(int userId) {
synchronized(mLock) {
mCurrentUserId = userId;
reloadBlacklistLocked();
}
}
private String[] getStringArrayLocked(String key) {
String flatString;
synchronized(mLock) {
flatString = Settings.Secure.getStringForUser(mContext.getContentResolver(), key,
mCurrentUserId);
}
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));
}
}
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