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      1 /*
      2  * Copyright 2015, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.server.telecom;
     18 
     19 import android.content.Context;
     20 import android.net.ConnectivityManager;
     21 import android.net.NetworkInfo;
     22 import android.os.Handler;
     23 import android.telecom.CallState;
     24 import android.telecom.PhoneAccountHandle;
     25 import android.telephony.TelephonyManager;
     26 import android.telephony.PhoneStateListener;
     27 import android.telephony.ServiceState;
     28 
     29 import java.util.Collection;
     30 import java.util.Objects;
     31 
     32 /**
     33  * Registers a timeout for a call and disconnects the call when the timeout expires.
     34  */
     35 final class CreateConnectionTimeout extends PhoneStateListener implements Runnable {
     36     private final Context mContext;
     37     private final PhoneAccountRegistrar mPhoneAccountRegistrar;
     38     private final ConnectionServiceWrapper mConnectionService;
     39     private final Call mCall;
     40     private final Handler mHandler = new Handler();
     41     private boolean mIsRegistered;
     42     private boolean mIsCallTimedOut;
     43 
     44     CreateConnectionTimeout(Context context, PhoneAccountRegistrar phoneAccountRegistrar,
     45             ConnectionServiceWrapper service, Call call) {
     46         mContext = context;
     47         mPhoneAccountRegistrar = phoneAccountRegistrar;
     48         mConnectionService = service;
     49         mCall = call;
     50     }
     51 
     52     boolean isTimeoutNeededForCall(Collection<PhoneAccountHandle> accounts,
     53             PhoneAccountHandle currentAccount) {
     54         // Non-emergency calls timeout automatically at the radio layer. No need for a timeout here.
     55         if (!TelephonyUtil.shouldProcessAsEmergency(mContext, mCall.getHandle())) {
     56             return false;
     57         }
     58 
     59         // If there's no connection manager to fallback on then there's no point in having a
     60         // timeout.
     61         PhoneAccountHandle connectionManager = mPhoneAccountRegistrar.getSimCallManager();
     62         if (!accounts.contains(connectionManager)) {
     63             return false;
     64         }
     65 
     66         // No need to add a timeout if the current attempt is over the connection manager.
     67         if (Objects.equals(connectionManager, currentAccount)) {
     68             return false;
     69         }
     70 
     71         // To reduce the number of scenarios where a timeout is needed, only use a timeout if
     72         // we're connected to Wi-Fi. This ensures that the fallback connection manager has an
     73         // alternate route to place the call. TODO: remove this condition or allow connection
     74         // managers to specify transports. See http://b/19199181.
     75         if (!isConnectedToWifi()) {
     76             return false;
     77         }
     78 
     79         Log.d(this, "isTimeoutNeededForCall, returning true");
     80         return true;
     81     }
     82 
     83     void registerTimeout() {
     84         Log.d(this, "registerTimeout");
     85         mIsRegistered = true;
     86         // First find out the cellular service state. Based on the state we decide whether a timeout
     87         // will actually be enforced and if so how long it should be.
     88         TelephonyManager telephonyManager =
     89             (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);
     90         telephonyManager.listen(this, PhoneStateListener.LISTEN_SERVICE_STATE);
     91         telephonyManager.listen(this, 0);
     92     }
     93 
     94     void unregisterTimeout() {
     95         Log.d(this, "unregisterTimeout");
     96         mIsRegistered = false;
     97         mHandler.removeCallbacksAndMessages(null);
     98     }
     99 
    100     boolean isCallTimedOut() {
    101         return mIsCallTimedOut;
    102     }
    103 
    104     @Override
    105     public void onServiceStateChanged(ServiceState serviceState) {
    106         long timeoutLengthMillis = getTimeoutLengthMillis(serviceState);
    107         if (!mIsRegistered) {
    108             Log.d(this, "onServiceStateChanged, timeout no longer registered, skipping");
    109         } else if (timeoutLengthMillis  <= 0) {
    110             Log.d(this, "onServiceStateChanged, timeout set to %d, skipping", timeoutLengthMillis);
    111         } else if (serviceState.getState() == ServiceState.STATE_IN_SERVICE) {
    112             // If cellular service is available then don't bother with a timeout.
    113             Log.d(this, "onServiceStateChanged, cellular service available, skipping");
    114         } else {
    115             mHandler.postDelayed(this, timeoutLengthMillis);
    116         }
    117     }
    118 
    119     @Override
    120     public void run() {
    121         if (mIsRegistered && isCallBeingPlaced(mCall)) {
    122             Log.d(this, "run, call timed out, calling disconnect");
    123             mIsCallTimedOut = true;
    124             mConnectionService.disconnect(mCall);
    125         }
    126     }
    127 
    128     static boolean isCallBeingPlaced(Call call) {
    129         int state = call.getState();
    130         return state == CallState.NEW
    131             || state == CallState.CONNECTING
    132             || state == CallState.DIALING;
    133     }
    134 
    135     private long getTimeoutLengthMillis(ServiceState serviceState) {
    136         // If the radio is off then use a longer timeout. This gives us more time to power on the
    137         // radio.
    138         if (serviceState.getState() == ServiceState.STATE_POWER_OFF) {
    139             return Timeouts.getEmergencyCallTimeoutRadioOffMillis(
    140                     mContext.getContentResolver());
    141         } else {
    142             return Timeouts.getEmergencyCallTimeoutMillis(mContext.getContentResolver());
    143         }
    144     }
    145 
    146     private boolean isConnectedToWifi() {
    147         ConnectivityManager cm = (ConnectivityManager) mContext.getSystemService(
    148             Context.CONNECTIVITY_SERVICE);
    149         if (cm != null) {
    150           NetworkInfo ni = cm.getActiveNetworkInfo();
    151           return ni != null && ni.isConnected() && ni.getType() == ConnectivityManager.TYPE_WIFI;
    152         }
    153         return false;
    154     }
    155 }
    156