com/android/internal/telephony/CellBroadcastHandler.java

/*
 * Copyright (C) 2013 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.internal.telephony;

import static android.provider.Settings.Secure.CMAS_ADDITIONAL_BROADCAST_PKG;

import android.Manifest;
import android.app.Activity;
import android.app.AppOpsManager;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Message;
import android.os.UserHandle;
import android.provider.Settings;
import android.provider.Telephony;
import android.telephony.SmsCbMessage;
import android.telephony.SubscriptionManager;
import android.util.LocalLog;

import com.android.internal.telephony.metrics.TelephonyMetrics;

import java.io.FileDescriptor;
import java.io.PrintWriter;

/**
 * Dispatch new Cell Broadcasts to receivers. Acquires a private wakelock until the broadcast
 * completes and our result receiver is called.
 */
public class CellBroadcastHandler extends WakeLockStateMachine {

    private final LocalLog mLocalLog = new LocalLog(100);

    private static final String EXTRA_MESSAGE = "message";

    private CellBroadcastHandler(Context context, Phone phone) {
        this("CellBroadcastHandler", context, phone);
    }

    protected CellBroadcastHandler(String debugTag, Context context, Phone phone) {
        super(debugTag, context, phone);
    }

    /**
     * Create a new CellBroadcastHandler.
     * @param context the context to use for dispatching Intents
     * @return the new handler
     */
    public static CellBroadcastHandler makeCellBroadcastHandler(Context context, Phone phone) {
        CellBroadcastHandler handler = new CellBroadcastHandler(context, phone);
        handler.start();
        return handler;
    }

    /**
     * Handle Cell Broadcast messages from {@code CdmaInboundSmsHandler}.
     * 3GPP-format Cell Broadcast messages sent from radio are handled in the subclass.
     *
     * @param message the message to process
     * @return true if an ordered broadcast was sent; false on failure
     */
    @Override
    protected boolean handleSmsMessage(Message message) {
        if (message.obj instanceof SmsCbMessage) {
            handleBroadcastSms((SmsCbMessage) message.obj);
            return true;
        } else {
            loge("handleMessage got object of type: " + message.obj.getClass().getName());
            return false;
        }
    }

    /**
     * Dispatch a Cell Broadcast message to listeners.
     * @param message the Cell Broadcast to broadcast
     */
    protected void handleBroadcastSms(SmsCbMessage message) {
        String receiverPermission;
        int appOp;

        // Log Cellbroadcast msg received event
        TelephonyMetrics metrics = TelephonyMetrics.getInstance();
        metrics.writeNewCBSms(mPhone.getPhoneId(), message.getMessageFormat(),
                message.getMessagePriority(), message.isCmasMessage(), message.isEtwsMessage(),
                message.getServiceCategory(), message.getSerialNumber(),
                System.currentTimeMillis());

        String msg;
        Intent intent;
        if (message.isEmergencyMessage()) {
            msg = "Dispatching emergency SMS CB, SmsCbMessage is: " + message;
            log(msg);
            mLocalLog.log(msg);
            intent = new Intent(Telephony.Sms.Intents.SMS_EMERGENCY_CB_RECEIVED_ACTION);
            //Emergency alerts need to be delivered with high priority
            intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
            receiverPermission = Manifest.permission.RECEIVE_EMERGENCY_BROADCAST;
            appOp = AppOpsManager.OP_RECEIVE_EMERGECY_SMS;

            intent.putExtra(EXTRA_MESSAGE, message);
            SubscriptionManager.putPhoneIdAndSubIdExtra(intent, mPhone.getPhoneId());

            if (Build.IS_DEBUGGABLE) {
                // Send additional broadcast intent to the specified package. This is only for sl4a
                // automation tests.
                final String additionalPackage = Settings.Secure.getString(
                        mContext.getContentResolver(), CMAS_ADDITIONAL_BROADCAST_PKG);
                if (additionalPackage != null) {
                    Intent additionalIntent = new Intent(intent);
                    additionalIntent.setPackage(additionalPackage);
                    mContext.sendOrderedBroadcastAsUser(additionalIntent, UserHandle.ALL,
                            receiverPermission, appOp, null, getHandler(), Activity.RESULT_OK,
                            null, null);
                }
            }

            String[] pkgs = mContext.getResources().getStringArray(
                    com.android.internal.R.array.config_defaultCellBroadcastReceiverPkgs);
            mReceiverCount.addAndGet(pkgs.length);
            for (String pkg : pkgs) {
                // Explicitly send the intent to all the configured cell broadcast receivers.
                intent.setPackage(pkg);
                mContext.sendOrderedBroadcastAsUser(intent, UserHandle.ALL, receiverPermission,
                        appOp, mReceiver, getHandler(), Activity.RESULT_OK, null, null);
            }
        } else {
            msg = "Dispatching SMS CB, SmsCbMessage is: " + message;
            log(msg);
            mLocalLog.log(msg);
            intent = new Intent(Telephony.Sms.Intents.SMS_CB_RECEIVED_ACTION);
            // Send implicit intent since there are various 3rd party carrier apps listen to
            // this intent.
            intent.addFlags(Intent.FLAG_RECEIVER_INCLUDE_BACKGROUND);
            receiverPermission = Manifest.permission.RECEIVE_SMS;
            appOp = AppOpsManager.OP_RECEIVE_SMS;

            intent.putExtra(EXTRA_MESSAGE, message);
            SubscriptionManager.putPhoneIdAndSubIdExtra(intent, mPhone.getPhoneId());

            mReceiverCount.incrementAndGet();
            mContext.sendOrderedBroadcastAsUser(intent, UserHandle.ALL, receiverPermission, appOp,
                    mReceiver, getHandler(), Activity.RESULT_OK, null, null);
        }
    }

    @Override
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        pw.println("CellBroadcastHandler:");
        mLocalLog.dump(fd, pw, args);
        pw.flush();
    }
}