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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
onCreate(Bundle bundle)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      */
processIntent(Intent intent)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 
verifyCallAction(Intent intent)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 
processOutgoingCallIntent(Intent intent)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 
processIncomingCallIntent(Intent intent)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 
isDefaultDialer()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      */
isVoiceCapable()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      */
sendBroadcastToReceiver(Intent intent, boolean incoming)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