1/*
2 * Copyright (C) 2008 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
17package com.android.internal.telephony;
18
19import android.app.Activity;
20import android.app.AppOpsManager;
21import android.content.BroadcastReceiver;
22import android.content.ComponentName;
23import android.content.Context;
24import android.content.Intent;
25import android.content.ServiceConnection;
26import android.os.IBinder;
27import android.os.RemoteException;
28import android.provider.Telephony.Sms.Intents;
29import android.telephony.Rlog;
30
31import com.android.internal.telephony.uicc.IccUtils;
32
33/**
34 * WAP push handler class.
35 *
36 * @hide
37 */
38public class WapPushOverSms implements ServiceConnection {
39    private static final String TAG = "WAP PUSH";
40    private static final boolean DBG = true;
41
42    private final Context mContext;
43
44    /** Assigned from ServiceConnection callback on main threaad. */
45    private volatile IWapPushManager mWapPushManager;
46
47    @Override
48    public void onServiceConnected(ComponentName name, IBinder service) {
49        mWapPushManager = IWapPushManager.Stub.asInterface(service);
50        if (DBG) Rlog.v(TAG, "wappush manager connected to " + hashCode());
51    }
52
53    @Override
54    public void onServiceDisconnected(ComponentName name) {
55        mWapPushManager = null;
56        if (DBG) Rlog.v(TAG, "wappush manager disconnected.");
57    }
58
59    public WapPushOverSms(Context context) {
60        mContext = context;
61        Intent intent = new Intent(IWapPushManager.class.getName());
62        ComponentName comp = intent.resolveSystemService(context.getPackageManager(), 0);
63        intent.setComponent(comp);
64        if (comp == null || !context.bindService(intent, this, Context.BIND_AUTO_CREATE)) {
65            Rlog.e(TAG, "bindService() for wappush manager failed");
66        } else {
67            if (DBG) Rlog.v(TAG, "bindService() for wappush manager succeeded");
68        }
69    }
70
71    void dispose() {
72        if (mWapPushManager != null) {
73            if (DBG) Rlog.v(TAG, "dispose: unbind wappush manager");
74            mContext.unbindService(this);
75        } else {
76            Rlog.e(TAG, "dispose: not bound to a wappush manager");
77        }
78    }
79
80    /**
81     * Dispatches inbound messages that are in the WAP PDU format. See
82     * wap-230-wsp-20010705-a section 8 for details on the WAP PDU format.
83     *
84     * @param pdu The WAP PDU, made up of one or more SMS PDUs
85     * @return a result code from {@link android.provider.Telephony.Sms.Intents}, or
86     *         {@link Activity#RESULT_OK} if the message has been broadcast
87     *         to applications
88     */
89    public int dispatchWapPdu(byte[] pdu, BroadcastReceiver receiver, InboundSmsHandler handler) {
90
91        if (DBG) Rlog.d(TAG, "Rx: " + IccUtils.bytesToHexString(pdu));
92
93        int index = 0;
94        int transactionId = pdu[index++] & 0xFF;
95        int pduType = pdu[index++] & 0xFF;
96
97        if ((pduType != WspTypeDecoder.PDU_TYPE_PUSH) &&
98                (pduType != WspTypeDecoder.PDU_TYPE_CONFIRMED_PUSH)) {
99            index = mContext.getResources().getInteger(
100                    com.android.internal.R.integer.config_valid_wappush_index);
101            if(index != -1) {
102                transactionId = pdu[index++] & 0xff;
103                pduType = pdu[index++] & 0xff;
104                if (DBG)
105                    Rlog.d(TAG, "index = " + index + " PDU Type = " + pduType +
106                            " transactionID = " + transactionId);
107
108                // recheck wap push pduType
109                if ((pduType != WspTypeDecoder.PDU_TYPE_PUSH)
110                        && (pduType != WspTypeDecoder.PDU_TYPE_CONFIRMED_PUSH)) {
111                    if (DBG) Rlog.w(TAG, "Received non-PUSH WAP PDU. Type = " + pduType);
112                    return Intents.RESULT_SMS_HANDLED;
113                }
114            } else {
115                if (DBG) Rlog.w(TAG, "Received non-PUSH WAP PDU. Type = " + pduType);
116                return Intents.RESULT_SMS_HANDLED;
117            }
118        }
119
120        WspTypeDecoder pduDecoder = new WspTypeDecoder(pdu);
121
122        /**
123         * Parse HeaderLen(unsigned integer).
124         * From wap-230-wsp-20010705-a section 8.1.2
125         * The maximum size of a uintvar is 32 bits.
126         * So it will be encoded in no more than 5 octets.
127         */
128        if (pduDecoder.decodeUintvarInteger(index) == false) {
129            if (DBG) Rlog.w(TAG, "Received PDU. Header Length error.");
130            return Intents.RESULT_SMS_GENERIC_ERROR;
131        }
132        int headerLength = (int) pduDecoder.getValue32();
133        index += pduDecoder.getDecodedDataLength();
134
135        int headerStartIndex = index;
136
137        /**
138         * Parse Content-Type.
139         * From wap-230-wsp-20010705-a section 8.4.2.24
140         *
141         * Content-type-value = Constrained-media | Content-general-form
142         * Content-general-form = Value-length Media-type
143         * Media-type = (Well-known-media | Extension-Media) *(Parameter)
144         * Value-length = Short-length | (Length-quote Length)
145         * Short-length = <Any octet 0-30>   (octet <= WAP_PDU_SHORT_LENGTH_MAX)
146         * Length-quote = <Octet 31>         (WAP_PDU_LENGTH_QUOTE)
147         * Length = Uintvar-integer
148         */
149        if (pduDecoder.decodeContentType(index) == false) {
150            if (DBG) Rlog.w(TAG, "Received PDU. Header Content-Type error.");
151            return Intents.RESULT_SMS_GENERIC_ERROR;
152        }
153
154        String mimeType = pduDecoder.getValueString();
155        long binaryContentType = pduDecoder.getValue32();
156        index += pduDecoder.getDecodedDataLength();
157
158        byte[] header = new byte[headerLength];
159        System.arraycopy(pdu, headerStartIndex, header, 0, header.length);
160
161        byte[] intentData;
162
163        if (mimeType != null && mimeType.equals(WspTypeDecoder.CONTENT_TYPE_B_PUSH_CO)) {
164            intentData = pdu;
165        } else {
166            int dataIndex = headerStartIndex + headerLength;
167            intentData = new byte[pdu.length - dataIndex];
168            System.arraycopy(pdu, dataIndex, intentData, 0, intentData.length);
169        }
170
171        /**
172         * Seek for application ID field in WSP header.
173         * If application ID is found, WapPushManager substitute the message
174         * processing. Since WapPushManager is optional module, if WapPushManager
175         * is not found, legacy message processing will be continued.
176         */
177        if (pduDecoder.seekXWapApplicationId(index, index + headerLength - 1)) {
178            index = (int) pduDecoder.getValue32();
179            pduDecoder.decodeXWapApplicationId(index);
180            String wapAppId = pduDecoder.getValueString();
181            if (wapAppId == null) {
182                wapAppId = Integer.toString((int) pduDecoder.getValue32());
183            }
184
185            String contentType = ((mimeType == null) ?
186                                  Long.toString(binaryContentType) : mimeType);
187            if (DBG) Rlog.v(TAG, "appid found: " + wapAppId + ":" + contentType);
188
189            try {
190                boolean processFurther = true;
191                IWapPushManager wapPushMan = mWapPushManager;
192
193                if (wapPushMan == null) {
194                    if (DBG) Rlog.w(TAG, "wap push manager not found!");
195                } else {
196                    Intent intent = new Intent();
197                    intent.putExtra("transactionId", transactionId);
198                    intent.putExtra("pduType", pduType);
199                    intent.putExtra("header", header);
200                    intent.putExtra("data", intentData);
201                    intent.putExtra("contentTypeParameters",
202                            pduDecoder.getContentParameters());
203
204                    int procRet = wapPushMan.processMessage(wapAppId, contentType, intent);
205                    if (DBG) Rlog.v(TAG, "procRet:" + procRet);
206                    if ((procRet & WapPushManagerParams.MESSAGE_HANDLED) > 0
207                        && (procRet & WapPushManagerParams.FURTHER_PROCESSING) == 0) {
208                        processFurther = false;
209                    }
210                }
211                if (!processFurther) {
212                    return Intents.RESULT_SMS_HANDLED;
213                }
214            } catch (RemoteException e) {
215                if (DBG) Rlog.w(TAG, "remote func failed...");
216            }
217        }
218        if (DBG) Rlog.v(TAG, "fall back to existing handler");
219
220        if (mimeType == null) {
221            if (DBG) Rlog.w(TAG, "Header Content-Type error.");
222            return Intents.RESULT_SMS_GENERIC_ERROR;
223        }
224
225        String permission;
226        int appOp;
227
228        if (mimeType.equals(WspTypeDecoder.CONTENT_TYPE_B_MMS)) {
229            permission = android.Manifest.permission.RECEIVE_MMS;
230            appOp = AppOpsManager.OP_RECEIVE_MMS;
231        } else {
232            permission = android.Manifest.permission.RECEIVE_WAP_PUSH;
233            appOp = AppOpsManager.OP_RECEIVE_WAP_PUSH;
234        }
235
236        Intent intent = new Intent(Intents.WAP_PUSH_DELIVER_ACTION);
237        intent.setType(mimeType);
238        intent.putExtra("transactionId", transactionId);
239        intent.putExtra("pduType", pduType);
240        intent.putExtra("header", header);
241        intent.putExtra("data", intentData);
242        intent.putExtra("contentTypeParameters", pduDecoder.getContentParameters());
243
244        // Direct the intent to only the default MMS app. If we can't find a default MMS app
245        // then sent it to all broadcast receivers.
246        ComponentName componentName = SmsApplication.getDefaultMmsApplication(mContext, true);
247        if (componentName != null) {
248            // Deliver MMS message only to this receiver
249            intent.setComponent(componentName);
250            if (DBG) Rlog.v(TAG, "Delivering MMS to: " + componentName.getPackageName() +
251                  " " + componentName.getClassName());
252        }
253
254        handler.dispatchIntent(intent, permission, appOp, receiver);
255        return Activity.RESULT_OK;
256    }
257}
258