1/*
2 * Copyright (C) 2007-2008 Esmertec AG.
3 * Copyright (C) 2007-2008 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18package com.android.mms.transaction;
19
20import static android.provider.Telephony.Sms.Intents.WAP_PUSH_RECEIVED_ACTION;
21import static com.google.android.mms.pdu.PduHeaders.MESSAGE_TYPE_DELIVERY_IND;
22import static com.google.android.mms.pdu.PduHeaders.MESSAGE_TYPE_NOTIFICATION_IND;
23import static com.google.android.mms.pdu.PduHeaders.MESSAGE_TYPE_READ_ORIG_IND;
24
25import com.android.mms.MmsConfig;
26import com.google.android.mms.ContentType;
27import com.google.android.mms.MmsException;
28import com.google.android.mms.pdu.DeliveryInd;
29import com.google.android.mms.pdu.GenericPdu;
30import com.google.android.mms.pdu.NotificationInd;
31import com.google.android.mms.pdu.PduHeaders;
32import com.google.android.mms.pdu.PduParser;
33import com.google.android.mms.pdu.PduPersister;
34import com.google.android.mms.pdu.ReadOrigInd;
35import android.database.sqlite.SqliteWrapper;
36
37import android.content.BroadcastReceiver;
38import android.content.ContentResolver;
39import android.content.ContentValues;
40import android.content.Context;
41import android.content.Intent;
42import android.database.Cursor;
43import android.database.DatabaseUtils;
44import android.net.Uri;
45import android.os.AsyncTask;
46import android.os.PowerManager;
47import android.provider.Telephony.Mms;
48import android.provider.Telephony.Mms.Inbox;
49import android.util.Log;
50
51/**
52 * Receives Intent.WAP_PUSH_RECEIVED_ACTION intents and starts the
53 * TransactionService by passing the push-data to it.
54 */
55public class PushReceiver extends BroadcastReceiver {
56    private static final String TAG = "PushReceiver";
57    private static final boolean DEBUG = false;
58    private static final boolean LOCAL_LOGV = false;
59
60    private class ReceivePushTask extends AsyncTask<Intent,Void,Void> {
61        private Context mContext;
62        public ReceivePushTask(Context context) {
63            mContext = context;
64        }
65
66        @Override
67        protected Void doInBackground(Intent... intents) {
68            Intent intent = intents[0];
69
70            // Get raw PDU push-data from the message and parse it
71            byte[] pushData = intent.getByteArrayExtra("data");
72            PduParser parser = new PduParser(pushData);
73            GenericPdu pdu = parser.parse();
74
75            if (null == pdu) {
76                Log.e(TAG, "Invalid PUSH data");
77                return null;
78            }
79
80            PduPersister p = PduPersister.getPduPersister(mContext);
81            ContentResolver cr = mContext.getContentResolver();
82            int type = pdu.getMessageType();
83            long threadId = -1;
84
85            try {
86                switch (type) {
87                    case MESSAGE_TYPE_DELIVERY_IND:
88                    case MESSAGE_TYPE_READ_ORIG_IND: {
89                        threadId = findThreadId(mContext, pdu, type);
90                        if (threadId == -1) {
91                            // The associated SendReq isn't found, therefore skip
92                            // processing this PDU.
93                            break;
94                        }
95
96                        Uri uri = p.persist(pdu, Inbox.CONTENT_URI);
97                        // Update thread ID for ReadOrigInd & DeliveryInd.
98                        ContentValues values = new ContentValues(1);
99                        values.put(Mms.THREAD_ID, threadId);
100                        SqliteWrapper.update(mContext, cr, uri, values, null, null);
101                        break;
102                    }
103                    case MESSAGE_TYPE_NOTIFICATION_IND: {
104                        NotificationInd nInd = (NotificationInd) pdu;
105
106                        if (MmsConfig.getTransIdEnabled()) {
107                            byte [] contentLocation = nInd.getContentLocation();
108                            if ('=' == contentLocation[contentLocation.length - 1]) {
109                                byte [] transactionId = nInd.getTransactionId();
110                                byte [] contentLocationWithId = new byte [contentLocation.length
111                                                                          + transactionId.length];
112                                System.arraycopy(contentLocation, 0, contentLocationWithId,
113                                        0, contentLocation.length);
114                                System.arraycopy(transactionId, 0, contentLocationWithId,
115                                        contentLocation.length, transactionId.length);
116                                nInd.setContentLocation(contentLocationWithId);
117                            }
118                        }
119
120                        if (!isDuplicateNotification(mContext, nInd)) {
121                            Uri uri = p.persist(pdu, Inbox.CONTENT_URI);
122                            // Start service to finish the notification transaction.
123                            Intent svc = new Intent(mContext, TransactionService.class);
124                            svc.putExtra(TransactionBundle.URI, uri.toString());
125                            svc.putExtra(TransactionBundle.TRANSACTION_TYPE,
126                                    Transaction.NOTIFICATION_TRANSACTION);
127                            mContext.startService(svc);
128                        } else if (LOCAL_LOGV) {
129                            Log.v(TAG, "Skip downloading duplicate message: "
130                                    + new String(nInd.getContentLocation()));
131                        }
132                        break;
133                    }
134                    default:
135                        Log.e(TAG, "Received unrecognized PDU.");
136                }
137            } catch (MmsException e) {
138                Log.e(TAG, "Failed to save the data from PUSH: type=" + type, e);
139            } catch (RuntimeException e) {
140                Log.e(TAG, "Unexpected RuntimeException.", e);
141            }
142
143            if (LOCAL_LOGV) {
144                Log.v(TAG, "PUSH Intent processed.");
145            }
146
147            return null;
148        }
149    }
150
151    @Override
152    public void onReceive(Context context, Intent intent) {
153        if (intent.getAction().equals(WAP_PUSH_RECEIVED_ACTION)
154                && ContentType.MMS_MESSAGE.equals(intent.getType())) {
155            if (LOCAL_LOGV) {
156                Log.v(TAG, "Received PUSH Intent: " + intent);
157            }
158
159            // Hold a wake lock for 5 seconds, enough to give any
160            // services we start time to take their own wake locks.
161            PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
162            PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
163                                            "MMS PushReceiver");
164            wl.acquire(5000);
165            new ReceivePushTask(context).execute(intent);
166        }
167    }
168
169    private static long findThreadId(Context context, GenericPdu pdu, int type) {
170        String messageId;
171
172        if (type == MESSAGE_TYPE_DELIVERY_IND) {
173            messageId = new String(((DeliveryInd) pdu).getMessageId());
174        } else {
175            messageId = new String(((ReadOrigInd) pdu).getMessageId());
176        }
177
178        StringBuilder sb = new StringBuilder('(');
179        sb.append(Mms.MESSAGE_ID);
180        sb.append('=');
181        sb.append(DatabaseUtils.sqlEscapeString(messageId));
182        sb.append(" AND ");
183        sb.append(Mms.MESSAGE_TYPE);
184        sb.append('=');
185        sb.append(PduHeaders.MESSAGE_TYPE_SEND_REQ);
186        // TODO ContentResolver.query() appends closing ')' to the selection argument
187        // sb.append(')');
188
189        Cursor cursor = SqliteWrapper.query(context, context.getContentResolver(),
190                            Mms.CONTENT_URI, new String[] { Mms.THREAD_ID },
191                            sb.toString(), null, null);
192        if (cursor != null) {
193            try {
194                if ((cursor.getCount() == 1) && cursor.moveToFirst()) {
195                    return cursor.getLong(0);
196                }
197            } finally {
198                cursor.close();
199            }
200        }
201
202        return -1;
203    }
204
205    private static boolean isDuplicateNotification(
206            Context context, NotificationInd nInd) {
207        byte[] rawLocation = nInd.getContentLocation();
208        if (rawLocation != null) {
209            String location = new String(rawLocation);
210            String selection = Mms.CONTENT_LOCATION + " = ?";
211            String[] selectionArgs = new String[] { location };
212            Cursor cursor = SqliteWrapper.query(
213                    context, context.getContentResolver(),
214                    Mms.CONTENT_URI, new String[] { Mms._ID },
215                    selection, selectionArgs, null);
216            if (cursor != null) {
217                try {
218                    if (cursor.getCount() > 0) {
219                        // We already received the same notification before.
220                        return true;
221                    }
222                } finally {
223                    cursor.close();
224                }
225            }
226        }
227        return false;
228    }
229}
230