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/*
* Copyright (C) 2011 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.cellbroadcastreceiver;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.UserManager;
import android.preference.PreferenceManager;
import android.provider.Telephony;
import android.telephony.ServiceState;
import android.telephony.cdma.CdmaSmsCbProgramData;
import android.util.Log;
import com.android.internal.telephony.IccCardConstants;
import com.android.internal.telephony.TelephonyIntents;
import com.android.internal.telephony.cdma.sms.SmsEnvelope;
public class CellBroadcastReceiver extends BroadcastReceiver {
private static final String TAG = "CellBroadcastReceiver";
static final boolean DBG = false; // STOPSHIP: change to false before ship
private static int mServiceState = -1;
public static final String CELLBROADCAST_START_CONFIG_ACTION =
"android.cellbroadcastreceiver.START_CONFIG";
// Key to access the stored reminder interval default value
private static final String CURRENT_INTERVAL_DEFAULT = "current_interval_default";
@Override
public void onReceive(Context context, Intent intent) {
onReceiveWithPrivilege(context, intent, false);
}
protected void onReceiveWithPrivilege(Context context, Intent intent, boolean privileged) {
if (DBG) log("onReceive " + intent);
String action = intent.getAction();
if (TelephonyIntents.ACTION_SERVICE_STATE_CHANGED.equals(action)) {
if (DBG) log("Intent: " + action);
ServiceState serviceState = ServiceState.newFromBundle(intent.getExtras());
if (serviceState != null) {
int newState = serviceState.getState();
if (newState != mServiceState) {
Log.d(TAG, "Service state changed! " + newState + " Full: " + serviceState +
" Current state=" + mServiceState);
mServiceState = newState;
if (((newState == ServiceState.STATE_IN_SERVICE) ||
(newState == ServiceState.STATE_EMERGENCY_ONLY)) &&
(UserManager.get(context).isSystemUser())) {
startConfigService(context.getApplicationContext());
}
}
}
} else if (TelephonyIntents.ACTION_DEFAULT_SMS_SUBSCRIPTION_CHANGED.equals(action) ||
CELLBROADCAST_START_CONFIG_ACTION.equals(action)) {
// Todo: Add the service state check once the new get service state API is done.
// Do not rely on mServiceState as it gets reset to -1 time to time because
// the process of CellBroadcastReceiver gets killed every time once the job is done.
if (UserManager.get(context).isSystemUser()) {
startConfigService(context.getApplicationContext());
}
else {
Log.e(TAG, "Not system user. Ignored the intent " + action);
}
} else if (Telephony.Sms.Intents.SMS_EMERGENCY_CB_RECEIVED_ACTION.equals(action) ||
Telephony.Sms.Intents.SMS_CB_RECEIVED_ACTION.equals(action)) {
// If 'privileged' is false, it means that the intent was delivered to the base
// no-permissions receiver class. If we get an SMS_CB_RECEIVED message that way, it
// means someone has tried to spoof the message by delivering it outside the normal
// permission-checked route, so we just ignore it.
if (privileged) {
intent.setClass(context, CellBroadcastAlertService.class);
context.startService(intent);
} else {
loge("ignoring unprivileged action received " + action);
}
} else if (Telephony.Sms.Intents.SMS_SERVICE_CATEGORY_PROGRAM_DATA_RECEIVED_ACTION
.equals(action)) {
if (privileged) {
CdmaSmsCbProgramData[] programDataList = (CdmaSmsCbProgramData[])
intent.getParcelableArrayExtra("program_data_list");
if (programDataList != null) {
handleCdmaSmsCbProgramData(context, programDataList);
} else {
loge("SCPD intent received with no program_data_list");
}
} else {
loge("ignoring unprivileged action received " + action);
}
} else if (TelephonyIntents.ACTION_SIM_STATE_CHANGED.equals(action)) {
String simState = intent.getStringExtra(IccCardConstants.INTENT_KEY_ICC_STATE);
// Whenever sim is loaded, we need to adjust the emergency alert
// reminder interval list because it might change since different
// countries/carriers might have different interval settings.
if (simState.equals(IccCardConstants.INTENT_VALUE_ICC_LOADED)) {
adjustReminderInterval(context.getApplicationContext());
}
} else {
Log.w(TAG, "onReceive() unexpected action " + action);
}
}
private void adjustReminderInterval(Context context) {
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
String currentIntervalDefault = sp.getString(CURRENT_INTERVAL_DEFAULT, "0");
// If interval default changes, reset the interval to the new default value.
String newIntervalDefault = context.getResources().getString(
R.string.alert_reminder_interval_default_value);
if (!newIntervalDefault.equals(currentIntervalDefault)) {
Log.d(TAG, "Default interval changed from " + currentIntervalDefault + " to " +
newIntervalDefault);
Editor editor = sp.edit();
// Reset the value to default.
editor.putString(
CellBroadcastSettings.KEY_ALERT_REMINDER_INTERVAL, newIntervalDefault);
// Save the new default value.
editor.putString(CURRENT_INTERVAL_DEFAULT, newIntervalDefault);
editor.commit();
} else {
if (DBG) Log.d(TAG, "Default interval " + currentIntervalDefault + " did not change.");
}
}
/**
* Handle Service Category Program Data message.
* TODO: Send Service Category Program Results response message to sender
*
* @param context
* @param programDataList
*/
private void handleCdmaSmsCbProgramData(Context context,
CdmaSmsCbProgramData[] programDataList) {
for (CdmaSmsCbProgramData programData : programDataList) {
switch (programData.getOperation()) {
case CdmaSmsCbProgramData.OPERATION_ADD_CATEGORY:
tryCdmaSetCategory(context, programData.getCategory(), true);
break;
case CdmaSmsCbProgramData.OPERATION_DELETE_CATEGORY:
tryCdmaSetCategory(context, programData.getCategory(), false);
break;
case CdmaSmsCbProgramData.OPERATION_CLEAR_CATEGORIES:
tryCdmaSetCategory(context,
SmsEnvelope.SERVICE_CATEGORY_CMAS_EXTREME_THREAT, false);
tryCdmaSetCategory(context,
SmsEnvelope.SERVICE_CATEGORY_CMAS_SEVERE_THREAT, false);
tryCdmaSetCategory(context,
SmsEnvelope.SERVICE_CATEGORY_CMAS_CHILD_ABDUCTION_EMERGENCY, false);
tryCdmaSetCategory(context,
SmsEnvelope.SERVICE_CATEGORY_CMAS_TEST_MESSAGE, false);
break;
default:
loge("Ignoring unknown SCPD operation " + programData.getOperation());
}
}
}
private void tryCdmaSetCategory(Context context, int category, boolean enable) {
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
switch (category) {
case SmsEnvelope.SERVICE_CATEGORY_CMAS_EXTREME_THREAT:
sharedPrefs.edit().putBoolean(
CellBroadcastSettings.KEY_ENABLE_CMAS_EXTREME_THREAT_ALERTS, enable)
.apply();
break;
case SmsEnvelope.SERVICE_CATEGORY_CMAS_SEVERE_THREAT:
sharedPrefs.edit().putBoolean(
CellBroadcastSettings.KEY_ENABLE_CMAS_SEVERE_THREAT_ALERTS, enable)
.apply();
break;
case SmsEnvelope.SERVICE_CATEGORY_CMAS_CHILD_ABDUCTION_EMERGENCY:
sharedPrefs.edit().putBoolean(
CellBroadcastSettings.KEY_ENABLE_CMAS_AMBER_ALERTS, enable).apply();
break;
case SmsEnvelope.SERVICE_CATEGORY_CMAS_TEST_MESSAGE:
sharedPrefs.edit().putBoolean(
CellBroadcastSettings.KEY_ENABLE_CMAS_TEST_ALERTS, enable).apply();
break;
default:
Log.w(TAG, "Ignoring SCPD command to " + (enable ? "enable" : "disable")
+ " alerts in category " + category);
}
}
/**
* Tell {@link CellBroadcastConfigService} to enable the CB channels.
* @param context the broadcast receiver context
*/
static void startConfigService(Context context) {
Intent serviceIntent = new Intent(CellBroadcastConfigService.ACTION_ENABLE_CHANNELS,
null, context, CellBroadcastConfigService.class);
Log.d(TAG, "Start Cell Broadcast configuration.");
context.startService(serviceIntent);
}
private static void log(String msg) {
Log.d(TAG, msg);
}
private static void loge(String msg) {
Log.e(TAG, msg);
}
}
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