1 /*
2  * Copyright (C) 2017 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.wifi;
18 
19 import android.app.Notification;
20 import android.app.PendingIntent;
21 import android.content.Intent;
22 import android.graphics.drawable.Icon;
23 import android.net.wifi.WifiConfiguration;
24 import android.net.wifi.WifiContext;
25 import android.net.wifi.WifiSsid;
26 import android.provider.Settings;
27 
28 import androidx.annotation.NonNull;
29 
30 import com.android.internal.annotations.VisibleForTesting;
31 import com.android.internal.messages.nano.SystemMessageProto.SystemMessage;
32 
33 /**
34  * Responsible for notifying user for wrong password errors.
35  */
36 public class WrongPasswordNotifier {
37     private static final String TAG = "WrongPasswordNotifier";
38     // Number of milliseconds to wait before automatically dismiss the notification.
39     private static final long CANCEL_TIMEOUT_MILLISECONDS = 5 * 60 * 1000;
40 
41     // Unique ID associated with the notification.
42     @VisibleForTesting
43     public static final int NOTIFICATION_ID = SystemMessage.NOTE_WIFI_WRONG_PASSWORD;
44 
45     // Flag indicating if a wrong password error is detected for the current connection.
46     private boolean mWrongPasswordDetected;
47 
48     private final WifiContext mContext;
49     private final WifiNotificationManager mNotificationManager;
50     private final FrameworkFacade mFrameworkFacade;
51 
WrongPasswordNotifier(WifiContext context, FrameworkFacade frameworkFacade, WifiNotificationManager wifiNotificationManager)52     public WrongPasswordNotifier(WifiContext context, FrameworkFacade frameworkFacade,
53             WifiNotificationManager wifiNotificationManager) {
54         mContext = context;
55         mFrameworkFacade = frameworkFacade;
56         mNotificationManager = wifiNotificationManager;
57     }
58 
59     /**
60      * Invoked when a wrong password error for a Wi-Fi network is detected.
61      *
62      * @param wifiConfiguration the network
63      */
onWrongPasswordError(@onNull WifiConfiguration wifiConfiguration)64     public void onWrongPasswordError(@NonNull WifiConfiguration wifiConfiguration) {
65         showNotification(wifiConfiguration);
66         mWrongPasswordDetected = true;
67     }
68 
69     /**
70      * Invoked when attempting a new Wi-Fi network connection.
71      */
onNewConnectionAttempt()72     public void onNewConnectionAttempt() {
73         if (mWrongPasswordDetected) {
74             dismissNotification();
75             mWrongPasswordDetected = false;
76         }
77     }
78 
79     /**
80      * Display wrong password notification for a given Wi-Fi network (specified by its SSID).
81      *
82      * @param wifiConfiguration the network
83      */
showNotification(@onNull WifiConfiguration wifiConfiguration)84     private void showNotification(@NonNull WifiConfiguration wifiConfiguration) {
85         CharSequence utf8Ssid = WifiSsid.fromString(wifiConfiguration.SSID).getUtf8Text();
86         if (utf8Ssid == null) {
87             // TODO(qal): Non-utf-8 SSIDs are currently not supported in Settings, and the intent
88             //            action will fail to open the password dialog for the correct network. In
89             //            addition, it is unclear which charset is appropriate for the non-utf-8
90             //            SSID. We may need to re-evaluate if we should support displaying non-utf-8
91             //            SSIDs from the framework or not. For now, fallback to the raw
92             //            WifiConfiguration.SSID so the user still gets a notification.
93             utf8Ssid = wifiConfiguration.SSID;
94         }
95         String settingsPackage = mFrameworkFacade.getSettingsPackageName(mContext);
96         if (settingsPackage == null) return;
97         Intent intent = new Intent(Settings.ACTION_WIFI_SETTINGS)
98                 .setPackage(settingsPackage)
99                 .putExtra("wifi_start_connect_ssid", utf8Ssid.toString());
100         intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
101         CharSequence title = mContext.getString(
102                 com.android.wifi.resources.R.string.wifi_available_title_failed_to_connect);
103         Notification.Builder builder = mFrameworkFacade.makeNotificationBuilder(mContext,
104                 WifiService.NOTIFICATION_NETWORK_ALERTS)
105                 .setAutoCancel(true)
106                 .setTimeoutAfter(CANCEL_TIMEOUT_MILLISECONDS)
107                 // TODO(zqiu): consider creating a new icon.
108                 .setSmallIcon(Icon.createWithResource(mContext.getWifiOverlayApkPkgName(),
109                         com.android.wifi.resources.R.drawable.stat_notify_wifi_in_range))
110                 .setContentTitle(title)
111                 .setContentText(utf8Ssid)
112                 .setContentIntent(mFrameworkFacade.getActivity(
113                         mContext, 0, intent,
114                         PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE))
115                 .setColor(mContext.getResources().getColor(
116                         android.R.color.system_notification_accent_color));
117         mNotificationManager.notify(NOTIFICATION_ID, builder.build());
118     }
119 
120     /**
121      * Dismiss the notification that was generated by {@link #showNotification}. The notification
122      * might have already been dismissed, either by user or timeout. We'll attempt to dismiss it
123      * regardless if it is been dismissed or not, to reduce code complexity.
124      */
dismissNotification()125     private void dismissNotification() {
126         // Notification might have already been dismissed, either by user or timeout. It is
127         // still okay to cancel it if already dismissed.
128         mNotificationManager.cancel(NOTIFICATION_ID);
129     }
130 }
131