1/*
2 * Copyright (C) 2014 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.nfc.beam;
18
19import android.app.Service;
20import android.bluetooth.BluetoothAdapter;
21import android.content.BroadcastReceiver;
22import android.content.Context;
23import android.content.Intent;
24import android.content.IntentFilter;
25import android.os.Handler;
26import android.os.IBinder;
27import android.os.Message;
28import android.os.Messenger;
29import android.os.RemoteException;
30import android.util.Log;
31
32public class BeamSendService extends Service implements BeamTransferManager.Callback {
33    private static String TAG = "BeamSendService";
34    private static boolean DBG = true;
35
36    public static String EXTRA_BEAM_TRANSFER_RECORD
37            = "com.android.nfc.beam.EXTRA_BEAM_TRANSFER_RECORD";
38    public static final String EXTRA_BEAM_COMPLETE_CALLBACK
39            = "com.android.nfc.beam.TRANSFER_COMPLETE_CALLBACK";
40
41    private BeamTransferManager mTransferManager;
42    private BeamStatusReceiver mBeamStatusReceiver;
43    private boolean mBluetoothEnabledByNfc;
44    private Messenger mCompleteCallback;
45    private int mStartId;
46
47    private final BluetoothAdapter mBluetoothAdapter;
48    private final BroadcastReceiver mBluetoothStateReceiver = new BroadcastReceiver() {
49        @Override
50        public void onReceive(Context context, Intent intent) {
51            String action = intent.getAction();
52            if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
53                handleBluetoothStateChanged(intent);
54            }
55        }
56    };
57
58    public BeamSendService() {
59        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
60    }
61
62    @Override
63    public void onCreate() {
64        super.onCreate();
65
66        // register BT state receiver
67        IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
68        registerReceiver(mBluetoothStateReceiver, filter);
69    }
70
71    @Override
72    public void onDestroy() {
73        super.onDestroy();
74
75        if (mBeamStatusReceiver != null) {
76            unregisterReceiver(mBeamStatusReceiver);
77        }
78        unregisterReceiver(mBluetoothStateReceiver);
79    }
80
81    @Override
82    public int onStartCommand(Intent intent, int flags, int startId) {
83        mStartId = startId;
84
85        BeamTransferRecord transferRecord;
86        if (intent == null ||
87                (transferRecord = intent.getParcelableExtra(EXTRA_BEAM_TRANSFER_RECORD)) == null) {
88            if (DBG) Log.e(TAG, "No transfer record provided. Stopping.");
89            stopSelf(startId);
90            return START_NOT_STICKY;
91        }
92
93        mCompleteCallback = intent.getParcelableExtra(EXTRA_BEAM_COMPLETE_CALLBACK);
94
95        if (doTransfer(transferRecord)) {
96            if (DBG) Log.i(TAG, "Starting outgoing Beam transfer");
97            return START_STICKY;
98        } else {
99            invokeCompleteCallback(false);
100            stopSelf(startId);
101            return START_NOT_STICKY;
102        }
103    }
104
105    boolean doTransfer(BeamTransferRecord transferRecord) {
106        if (createBeamTransferManager(transferRecord)) {
107            // register Beam status receiver
108            mBeamStatusReceiver = new BeamStatusReceiver(this, mTransferManager);
109            registerReceiver(mBeamStatusReceiver, mBeamStatusReceiver.getIntentFilter(),
110                    BeamStatusReceiver.BEAM_STATUS_PERMISSION, new Handler());
111
112            if (transferRecord.dataLinkType == BeamTransferRecord.DATA_LINK_TYPE_BLUETOOTH) {
113                if (mBluetoothAdapter.isEnabled()) {
114                    // Start the transfer
115                    mTransferManager.start();
116                } else {
117                    if (!mBluetoothAdapter.enableNoAutoConnect()) {
118                        Log.e(TAG, "Error enabling Bluetooth.");
119                        mTransferManager = null;
120                        return false;
121                    }
122                    mBluetoothEnabledByNfc = true;
123                    if (DBG) Log.d(TAG, "Queueing out transfer "
124                            + Integer.toString(transferRecord.id));
125                }
126            }
127            return true;
128        }
129
130        return false;
131    }
132
133    boolean createBeamTransferManager(BeamTransferRecord transferRecord) {
134        if (mTransferManager != null) {
135            return false;
136        }
137
138        if (transferRecord.dataLinkType != BeamTransferRecord.DATA_LINK_TYPE_BLUETOOTH) {
139            // only support BT
140            return false;
141        }
142
143        mTransferManager = new BeamTransferManager(this, this, transferRecord, false);
144        mTransferManager.updateNotification();
145        return true;
146    }
147
148    private void handleBluetoothStateChanged(Intent intent) {
149        int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,
150                BluetoothAdapter.ERROR);
151        if (state == BluetoothAdapter.STATE_ON) {
152            if (mTransferManager != null &&
153                    mTransferManager.mDataLinkType == BeamTransferRecord.DATA_LINK_TYPE_BLUETOOTH) {
154                mTransferManager.start();
155            }
156        } else if (state == BluetoothAdapter.STATE_OFF) {
157            mBluetoothEnabledByNfc = false;
158        }
159    }
160
161    private void invokeCompleteCallback(boolean success) {
162        if (mCompleteCallback != null) {
163            try {
164                Message msg = Message.obtain(null, BeamManager.MSG_BEAM_COMPLETE);
165                msg.arg1 = success ? 1 : 0;
166                mCompleteCallback.send(msg);
167            } catch (RemoteException e) {
168                Log.e(TAG, "failed to invoke Beam complete callback", e);
169            }
170        }
171    }
172
173    @Override
174    public void onTransferComplete(BeamTransferManager transfer, boolean success) {
175        // Play success sound
176        if (!success) {
177            if (DBG) Log.d(TAG, "Transfer failed, final state: " +
178                    Integer.toString(transfer.mState));
179        }
180
181        if (mBluetoothEnabledByNfc) {
182            mBluetoothEnabledByNfc = false;
183            mBluetoothAdapter.disable();
184        }
185
186        invokeCompleteCallback(success);
187        stopSelf(mStartId);
188    }
189
190    @Override
191    public IBinder onBind(Intent intent) {
192        return null;
193    }
194}
195