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      1 /*
      2  * Copyright (C) 2015 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 package com.android.voicemail.impl.sms;
     17 
     18 import android.app.PendingIntent;
     19 import android.content.Context;
     20 import android.support.annotation.Nullable;
     21 import android.telecom.PhoneAccountHandle;
     22 import android.text.TextUtils;
     23 import com.android.voicemail.impl.OmtpConstants;
     24 
     25 /** A implementation of the OmtpMessageSender using the standard OMTP sms protocol. */
     26 public class OmtpStandardMessageSender extends OmtpMessageSender {
     27   private final String clientType;
     28   private final String protocolVersion;
     29   private final String clientPrefix;
     30 
     31   /**
     32    * Creates a new instance of OmtpStandardMessageSender.
     33    *
     34    * @param applicationPort If set to a value > 0 then a binary sms is sent to this port number.
     35    *     Otherwise, a standard text SMS is sent.
     36    * @param destinationNumber Destination number to be used.
     37    * @param clientType The "ct" field to be set in the MO message. This is the value used by the VVM
     38    *     server to identify the client. Certain VVM servers require a specific agreed value for this
     39    *     field.
     40    * @param protocolVersion OMTP protocol version.
     41    * @param clientPrefix The client prefix requested to be used by the server in its MT messages.
     42    */
     43   public OmtpStandardMessageSender(
     44       Context context,
     45       PhoneAccountHandle phoneAccountHandle,
     46       short applicationPort,
     47       String destinationNumber,
     48       String clientType,
     49       String protocolVersion,
     50       String clientPrefix) {
     51     super(context, phoneAccountHandle, applicationPort, destinationNumber);
     52     this.clientType = clientType;
     53     this.protocolVersion = protocolVersion;
     54     this.clientPrefix = clientPrefix;
     55   }
     56 
     57   // Activate message:
     58   // V1.1: Activate:pv=<value>;ct=<value>
     59   // V1.2: Activate:pv=<value>;ct=<value>;pt=<value>;<Clientprefix>
     60   // V1.3: Activate:pv=<value>;ct=<value>;pt=<value>;<Clientprefix>
     61   @Override
     62   public void requestVvmActivation(@Nullable PendingIntent sentIntent) {
     63     StringBuilder sb = new StringBuilder().append(OmtpConstants.ACTIVATE_REQUEST);
     64 
     65     appendProtocolVersionAndClientType(sb);
     66     if (TextUtils.equals(protocolVersion, OmtpConstants.PROTOCOL_VERSION1_2)
     67         || TextUtils.equals(protocolVersion, OmtpConstants.PROTOCOL_VERSION1_3)) {
     68       appendApplicationPort(sb);
     69       appendClientPrefix(sb);
     70     }
     71 
     72     sendSms(sb.toString(), sentIntent);
     73   }
     74 
     75   // Deactivate message:
     76   // V1.1: Deactivate:pv=<value>;ct=<string>
     77   // V1.2: Deactivate:pv=<value>;ct=<string>
     78   // V1.3: Deactivate:pv=<value>;ct=<string>
     79   @Override
     80   public void requestVvmDeactivation(@Nullable PendingIntent sentIntent) {
     81     StringBuilder sb = new StringBuilder().append(OmtpConstants.DEACTIVATE_REQUEST);
     82     appendProtocolVersionAndClientType(sb);
     83 
     84     sendSms(sb.toString(), sentIntent);
     85   }
     86 
     87   // Status message:
     88   // V1.1: STATUS
     89   // V1.2: STATUS
     90   // V1.3: STATUS:pv=<value>;ct=<value>;pt=<value>;<Clientprefix>
     91   @Override
     92   public void requestVvmStatus(@Nullable PendingIntent sentIntent) {
     93     StringBuilder sb = new StringBuilder().append(OmtpConstants.STATUS_REQUEST);
     94 
     95     if (TextUtils.equals(protocolVersion, OmtpConstants.PROTOCOL_VERSION1_3)) {
     96       appendProtocolVersionAndClientType(sb);
     97       appendApplicationPort(sb);
     98       appendClientPrefix(sb);
     99     }
    100 
    101     sendSms(sb.toString(), sentIntent);
    102   }
    103 
    104   private void appendProtocolVersionAndClientType(StringBuilder sb) {
    105     sb.append(OmtpConstants.SMS_PREFIX_SEPARATOR);
    106     appendField(sb, OmtpConstants.PROTOCOL_VERSION, protocolVersion);
    107     sb.append(OmtpConstants.SMS_FIELD_SEPARATOR);
    108     appendField(sb, OmtpConstants.CLIENT_TYPE, clientType);
    109   }
    110 
    111   private void appendApplicationPort(StringBuilder sb) {
    112     sb.append(OmtpConstants.SMS_FIELD_SEPARATOR);
    113     appendField(sb, OmtpConstants.APPLICATION_PORT, applicationPort);
    114   }
    115 
    116   private void appendClientPrefix(StringBuilder sb) {
    117     sb.append(OmtpConstants.SMS_FIELD_SEPARATOR);
    118     sb.append(clientPrefix);
    119   }
    120 }
    121