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      1 /*
      2  * Copyright (C) 2013 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.app.Activity;
     20 import android.content.ComponentName;
     21 import android.content.Context;
     22 import android.content.Intent;
     23 import android.net.Uri;
     24 import android.os.Bundle;
     25 import android.os.UserHandle;
     26 import android.os.UserManager;
     27 import android.telecom.PhoneAccount;
     28 import android.telecom.PhoneAccountHandle;
     29 import android.telecom.TelecomManager;
     30 import android.telephony.DisconnectCause;
     31 import android.telephony.PhoneNumberUtils;
     32 import android.text.TextUtils;
     33 import android.widget.Toast;
     34 
     35 // TODO: Needed for move to system service: import com.android.internal.R;
     36 
     37 /**
     38  * Activity that handles system CALL actions and forwards them to {@link CallReceiver}.
     39  * Handles all three CALL action types: CALL, CALL_PRIVILEGED, and CALL_EMERGENCY.
     40  *
     41  * Pre-L, the only way apps were were allowed to make outgoing emergency calls was the
     42  * ACTION_CALL_PRIVILEGED action (which requires the system only CALL_PRIVILEGED permission).
     43  *
     44  * In L, any app that has the CALL_PRIVILEGED permission can continue to make outgoing emergency
     45  * calls via ACTION_CALL_PRIVILEGED.
     46  *
     47  * In addition, the default dialer (identified via
     48  * {@link android.telecom.TelecomManager#getDefaultPhoneApp()} will also be granted the ability to
     49  * make emergency outgoing calls using the CALL action. In order to do this, it must call
     50  * startActivityForResult on the CALL intent to allow its package name to be passed to
     51  * {@link CallActivity}. Calling startActivity will continue to work on all non-emergency numbers
     52  * just like it did pre-L.
     53  */
     54 public class CallActivity extends Activity {
     55 
     56     @Override
     57     protected void onCreate(Bundle bundle) {
     58         super.onCreate(bundle);
     59 
     60         // TODO: Figure out if there is something to restore from bundle.
     61         // See OutgoingCallBroadcaster in services/Telephony for more.
     62 
     63         processIntent(getIntent());
     64 
     65         // This activity does not have associated UI, so close.
     66         finish();
     67         Log.d(this, "onCreate: end");
     68     }
     69 
     70     /**
     71      * Processes intents sent to the activity.
     72      *
     73      * @param intent The intent.
     74      */
     75     private void processIntent(Intent intent) {
     76         // Ensure call intents are not processed on devices that are not capable of calling.
     77         if (!isVoiceCapable()) {
     78             return;
     79         }
     80 
     81         verifyCallAction(intent);
     82         String action = intent.getAction();
     83 
     84         if (Intent.ACTION_CALL.equals(action) ||
     85                 Intent.ACTION_CALL_PRIVILEGED.equals(action) ||
     86                 Intent.ACTION_CALL_EMERGENCY.equals(action)) {
     87             processOutgoingCallIntent(intent);
     88         } else if (TelecomManager.ACTION_INCOMING_CALL.equals(action)) {
     89             processIncomingCallIntent(intent);
     90         }
     91     }
     92 
     93     private void verifyCallAction(Intent intent) {
     94         if (CallActivity.class.getName().equals(intent.getComponent().getClassName())) {
     95             // If we were launched directly from the CallActivity, not one of its more privileged
     96             // aliases, then make sure that only the non-privileged actions are allowed.
     97             if (!Intent.ACTION_CALL.equals(intent.getAction())) {
     98                 Log.w(this, "Attempt to deliver non-CALL action; forcing to CALL");
     99                 intent.setAction(Intent.ACTION_CALL);
    100             }
    101         }
    102     }
    103 
    104     private void processOutgoingCallIntent(Intent intent) {
    105         Uri handle = intent.getData();
    106         String scheme = handle.getScheme();
    107         String uriString = handle.getSchemeSpecificPart();
    108 
    109         if (!PhoneAccount.SCHEME_VOICEMAIL.equals(scheme)) {
    110             handle = Uri.fromParts(PhoneNumberUtils.isUriNumber(uriString) ?
    111                     PhoneAccount.SCHEME_SIP : PhoneAccount.SCHEME_TEL, uriString, null);
    112         }
    113 
    114         UserManager userManager = (UserManager) getSystemService(Context.USER_SERVICE);
    115         if (userManager.hasUserRestriction(UserManager.DISALLOW_OUTGOING_CALLS)
    116                 && !TelephonyUtil.shouldProcessAsEmergency(this, handle)) {
    117             // Only emergency calls are allowed for users with the DISALLOW_OUTGOING_CALLS
    118             // restriction.
    119             Toast.makeText(this, getResources().getString(R.string.outgoing_call_not_allowed),
    120                     Toast.LENGTH_SHORT).show();
    121             Log.d(this, "Rejecting non-emergency phone call due to DISALLOW_OUTGOING_CALLS "
    122                     + "restriction");
    123             return;
    124         }
    125 
    126         intent.putExtra(CallReceiver.KEY_IS_DEFAULT_DIALER, isDefaultDialer());
    127 
    128         if (UserHandle.myUserId() == UserHandle.USER_OWNER) {
    129             CallReceiver.processOutgoingCallIntent(getApplicationContext(), intent);
    130         } else {
    131             sendBroadcastToReceiver(intent, false /* isIncoming */);
    132         }
    133     }
    134 
    135     private void processIncomingCallIntent(Intent intent) {
    136         if (UserHandle.myUserId() == UserHandle.USER_OWNER) {
    137             CallReceiver.processIncomingCallIntent(intent);
    138         } else {
    139             sendBroadcastToReceiver(intent, true /* isIncoming */);
    140         }
    141     }
    142 
    143     private boolean isDefaultDialer() {
    144         final String packageName = getCallingPackage();
    145         if (TextUtils.isEmpty(packageName)) {
    146             return false;
    147         }
    148 
    149         final TelecomManager telecomManager =
    150                 (TelecomManager) getSystemService(Context.TELECOM_SERVICE);
    151         final ComponentName defaultPhoneApp = telecomManager.getDefaultPhoneApp();
    152         return (defaultPhoneApp != null
    153                 && TextUtils.equals(defaultPhoneApp.getPackageName(), packageName));
    154     }
    155 
    156     /**
    157      * Returns whether the device is voice-capable (e.g. a phone vs a tablet).
    158      *
    159      * @return {@code True} if the device is voice-capable.
    160      */
    161     private boolean isVoiceCapable() {
    162         return getApplicationContext().getResources().getBoolean(
    163                 com.android.internal.R.bool.config_voice_capable);
    164     }
    165 
    166     /**
    167      * Trampolines the intent to the broadcast receiver that runs only as the primary user.
    168      */
    169     private boolean sendBroadcastToReceiver(Intent intent, boolean incoming) {
    170         intent.putExtra(CallReceiver.KEY_IS_INCOMING_CALL, incoming);
    171         intent.setFlags(Intent.FLAG_RECEIVER_FOREGROUND);
    172         intent.setClass(this, CallReceiver.class);
    173         Log.d(this, "Sending broadcast as user to CallReceiver- isIncoming: %s", incoming);
    174         sendBroadcastAsUser(intent, UserHandle.OWNER);
    175         return true;
    176     }
    177 }
    178