/*
* Copyright (C) 2014 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.systemui.statusbar.policy;
import android.app.ActivityManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiConfiguration.KeyMgmt;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiManager.ActionListener;
import android.os.UserHandle;
import android.os.UserManager;
import android.provider.Settings;
import android.text.TextUtils;
import android.util.ArrayMap;
import android.util.ArraySet;
import android.util.Log;
import com.android.systemui.R;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
// TODO: Unify this logic with platform settings (see WifiSettings and AccessPoint). There is a
// fair amount of complexity here in statuses and logic beyond just connected/disconnected.
public class AccessPointControllerImpl implements NetworkController.AccessPointController {
private static final String TAG = "AccessPointController";
private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
// This string extra specifies a network to open the connect dialog on, so the user can enter
// network credentials. This is used by quick settings for secured networks.
private static final String EXTRA_START_CONNECT_SSID = "wifi_start_connect_ssid";
private static final int[] ICONS = {
R.drawable.ic_qs_wifi_0,
R.drawable.ic_qs_wifi_full_1,
R.drawable.ic_qs_wifi_full_2,
R.drawable.ic_qs_wifi_full_3,
R.drawable.ic_qs_wifi_full_4,
};
private final Context mContext;
private final ArrayList<AccessPointCallback> mCallbacks = new ArrayList<AccessPointCallback>();
private final WifiManager mWifiManager;
private final UserManager mUserManager;
private final Receiver mReceiver = new Receiver();
private NetworkControllerImpl mNetworkController;
private boolean mScanning;
private int mCurrentUser;
public AccessPointControllerImpl(Context context) {
mContext = context;
mWifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
mUserManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
mCurrentUser = ActivityManager.getCurrentUser();
}
void setNetworkController(NetworkControllerImpl networkController) {
mNetworkController = networkController;
}
public boolean canConfigWifi() {
return !mUserManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_WIFI,
new UserHandle(mCurrentUser));
}
public void onUserSwitched(int newUserId) {
mCurrentUser = newUserId;
}
@Override
public void addAccessPointCallback(AccessPointCallback callback) {
if (callback == null || mCallbacks.contains(callback)) return;
if (DEBUG) Log.d(TAG, "addCallback " + callback);
mCallbacks.add(callback);
mReceiver.setListening(!mCallbacks.isEmpty());
}
@Override
public void removeAccessPointCallback(AccessPointCallback callback) {
if (callback == null) return;
if (DEBUG) Log.d(TAG, "removeCallback " + callback);
mCallbacks.remove(callback);
mReceiver.setListening(!mCallbacks.isEmpty());
}
@Override
public void scanForAccessPoints() {
if (mScanning) return;
if (DEBUG) Log.d(TAG, "scan!");
mScanning = mWifiManager.startScan();
// Grab current networks immediately while we wait for scan.
updateAccessPoints();
}
public boolean connect(AccessPoint ap) {
if (ap == null) return false;
if (DEBUG) Log.d(TAG, "connect networkId=" + ap.networkId);
if (ap.networkId < 0) {
// Unknown network, need to add it.
if (ap.hasSecurity) {
Intent intent = new Intent(Settings.ACTION_WIFI_SETTINGS);
intent.putExtra(EXTRA_START_CONNECT_SSID, ap.ssid);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
fireSettingsIntentCallback(intent);
return true;
} else {
WifiConfiguration config = new WifiConfiguration();
config.SSID = "\"" + ap.ssid + "\"";
config.allowedKeyManagement.set(KeyMgmt.NONE);
mWifiManager.connect(config, mConnectListener);
}
} else {
mWifiManager.connect(ap.networkId, mConnectListener);
}
return false;
}
private void fireSettingsIntentCallback(Intent intent) {
for (AccessPointCallback callback : mCallbacks) {
callback.onSettingsActivityTriggered(intent);
}
}
private void fireAcccessPointsCallback(AccessPoint[] aps) {
for (AccessPointCallback callback : mCallbacks) {
callback.onAccessPointsChanged(aps);
}
}
private static String trimDoubleQuotes(String v) {
return v != null && v.length() >= 2 && v.charAt(0) == '\"'
&& v.charAt(v.length() - 1) == '\"' ? v.substring(1, v.length() - 1) : v;
}
private int getConnectedNetworkId(WifiInfo wifiInfo) {
return wifiInfo != null ? wifiInfo.getNetworkId() : AccessPoint.NO_NETWORK;
}
private ArrayMap<String, WifiConfiguration> getConfiguredNetworksBySsid() {
final List<WifiConfiguration> configs = mWifiManager.getConfiguredNetworks();
if (configs == null || configs.size() == 0) return ArrayMap.EMPTY;
final ArrayMap<String, WifiConfiguration> rt = new ArrayMap<String, WifiConfiguration>();
for (WifiConfiguration config : configs) {
rt.put(trimDoubleQuotes(config.SSID), config);
}
return rt;
}
private void updateAccessPoints() {
final WifiInfo wifiInfo = mWifiManager.getConnectionInfo();
final int connectedNetworkId = getConnectedNetworkId(wifiInfo);
if (DEBUG) Log.d(TAG, "connectedNetworkId: " + connectedNetworkId);
final List<ScanResult> scanResults = mWifiManager.getScanResults();
final ArrayMap<String, WifiConfiguration> configured = getConfiguredNetworksBySsid();
if (DEBUG) Log.d(TAG, "scanResults: " + scanResults);
final List<AccessPoint> aps = new ArrayList<AccessPoint>(scanResults.size());
final ArraySet<String> ssids = new ArraySet<String>();
for (ScanResult scanResult : scanResults) {
if (scanResult == null) {
continue;
}
final String ssid = scanResult.SSID;
if (TextUtils.isEmpty(ssid) || ssids.contains(ssid)) continue;
ssids.add(ssid);
final WifiConfiguration config = configured.get(ssid);
final int level = WifiManager.calculateSignalLevel(scanResult.level, ICONS.length);
final AccessPoint ap = new AccessPoint();
ap.isConfigured = config != null;
ap.networkId = config != null ? config.networkId : AccessPoint.NO_NETWORK;
ap.ssid = ssid;
// Connected if either:
// -The network ID in the active WifiInfo matches this network's ID.
// -The network is ephemeral (no configuration) but the SSID matches.
ap.isConnected = (ap.networkId != AccessPoint.NO_NETWORK
&& ap.networkId == connectedNetworkId) ||
(ap.networkId == WifiConfiguration.INVALID_NETWORK_ID && wifiInfo != null &&
ap.ssid.equals(trimDoubleQuotes(wifiInfo.getSSID())));
if (ap.isConnected && mNetworkController != null) {
// Ensure we have the connected network's RSSI.
ap.level = mNetworkController.getConnectedWifiLevel();
} else {
ap.level = level;
}
ap.iconId = ICONS[ap.level];
// Based on Settings AccessPoint#getSecurity, keep up to date
// with better methods of determining no security or not.
ap.hasSecurity = scanResult.capabilities.contains("WEP")
|| scanResult.capabilities.contains("PSK")
|| scanResult.capabilities.contains("EAP");
aps.add(ap);
}
Collections.sort(aps, mByStrength);
fireAcccessPointsCallback(aps.toArray(new AccessPoint[aps.size()]));
}
private final ActionListener mConnectListener = new ActionListener() {
@Override
public void onSuccess() {
if (DEBUG) Log.d(TAG, "connect success");
}
@Override
public void onFailure(int reason) {
if (DEBUG) Log.d(TAG, "connect failure reason=" + reason);
}
};
private final Comparator<AccessPoint> mByStrength = new Comparator<AccessPoint> () {
@Override
public int compare(AccessPoint lhs, AccessPoint rhs) {
return -Integer.compare(score(lhs), score(rhs));
}
private int score(AccessPoint ap) {
return ap.level + (ap.isConnected ? 20 : 0) + (ap.isConfigured ? 10 : 0);
}
};
private final class Receiver extends BroadcastReceiver {
private boolean mRegistered;
public void setListening(boolean listening) {
if (listening && !mRegistered) {
if (DEBUG) Log.d(TAG, "Registering receiver");
final IntentFilter filter = new IntentFilter();
filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
filter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
filter.addAction(WifiManager.NETWORK_IDS_CHANGED_ACTION);
filter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
filter.addAction(WifiManager.CONFIGURED_NETWORKS_CHANGED_ACTION);
filter.addAction(WifiManager.LINK_CONFIGURATION_CHANGED_ACTION);
filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
filter.addAction(WifiManager.RSSI_CHANGED_ACTION);
mContext.registerReceiver(this, filter);
mRegistered = true;
} else if (!listening && mRegistered) {
if (DEBUG) Log.d(TAG, "Unregistering receiver");
mContext.unregisterReceiver(this);
mRegistered = false;
}
}
@Override
public void onReceive(Context context, Intent intent) {
if (DEBUG) Log.d(TAG, "onReceive " + intent.getAction());
if (WifiManager.SCAN_RESULTS_AVAILABLE_ACTION.equals(intent.getAction())) {
updateAccessPoints();
mScanning = false;
}
}
}
}