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/*
* Copyright (C) 2010 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.nfc.ndefpush;
import com.android.nfc.DeviceHost.LlcpServerSocket;
import com.android.nfc.DeviceHost.LlcpSocket;
import com.android.nfc.LlcpException;
import com.android.nfc.NfcService;
import android.nfc.FormatException;
import android.nfc.NdefMessage;
import android.nfc.NfcAdapter;
import android.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/**
* A simple server that accepts NDEF messages pushed to it over an LLCP connection. Those messages
* are typically set on the client side by using {@link NfcAdapter#enableForegroundNdefPush}.
*/
public class NdefPushServer {
private static final String TAG = "NdefPushServer";
private static final boolean DBG = true;
private static final int MIU = 248;
int mSap;
static final String SERVICE_NAME = "com.android.npp";
NfcService mService = NfcService.getInstance();
final Callback mCallback;
/** Protected by 'this', null when stopped, non-null when running */
ServerThread mServerThread = null;
public interface Callback {
void onMessageReceived(NdefMessage msg);
}
public NdefPushServer(final int sap, Callback callback) {
mSap = sap;
mCallback = callback;
}
/** Connection class, used to handle incoming connections */
private class ConnectionThread extends Thread {
private LlcpSocket mSock;
ConnectionThread(LlcpSocket sock) {
super(TAG);
mSock = sock;
}
@Override
public void run() {
if (DBG) Log.d(TAG, "starting connection thread");
try {
ByteArrayOutputStream buffer = new ByteArrayOutputStream(1024);
byte[] partial = new byte[1024];
int size;
boolean connectionBroken = false;
// Get raw data from remote server
while(!connectionBroken) {
try {
size = mSock.receive(partial);
if (DBG) Log.d(TAG, "read " + size + " bytes");
if (size < 0) {
connectionBroken = true;
break;
} else {
buffer.write(partial, 0, size);
}
} catch (IOException e) {
// Connection broken
connectionBroken = true;
if (DBG) Log.d(TAG, "connection broken by IOException", e);
}
}
// Build NDEF message set from the stream
NdefPushProtocol msg = new NdefPushProtocol(buffer.toByteArray());
if (DBG) Log.d(TAG, "got message " + msg.toString());
// Send the intent for the fake tag
mCallback.onMessageReceived(msg.getImmediate());
} catch (FormatException e) {
Log.e(TAG, "badly formatted NDEF message, ignoring", e);
} finally {
try {
if (DBG) Log.d(TAG, "about to close");
mSock.close();
} catch (IOException e) {
// ignore
}
}
if (DBG) Log.d(TAG, "finished connection thread");
}
}
/** Server class, used to listen for incoming connection request */
class ServerThread extends Thread {
// Variables below synchronized on NdefPushServer.this
boolean mRunning = true;
LlcpServerSocket mServerSocket;
@Override
public void run() {
boolean threadRunning;
synchronized (NdefPushServer.this) {
threadRunning = mRunning;
}
while (threadRunning) {
if (DBG) Log.d(TAG, "about create LLCP service socket");
try {
synchronized (NdefPushServer.this) {
mServerSocket = mService.createLlcpServerSocket(mSap, SERVICE_NAME,
MIU, 1, 1024);
}
if (mServerSocket == null) {
if (DBG) Log.d(TAG, "failed to create LLCP service socket");
return;
}
if (DBG) Log.d(TAG, "created LLCP service socket");
synchronized (NdefPushServer.this) {
threadRunning = mRunning;
}
while (threadRunning) {
LlcpServerSocket serverSocket;
synchronized (NdefPushServer.this) {
serverSocket = mServerSocket;
}
if (serverSocket == null) return;
if (DBG) Log.d(TAG, "about to accept");
LlcpSocket communicationSocket = serverSocket.accept();
if (DBG) Log.d(TAG, "accept returned " + communicationSocket);
if (communicationSocket != null) {
new ConnectionThread(communicationSocket).start();
}
synchronized (NdefPushServer.this) {
threadRunning = mRunning;
}
}
if (DBG) Log.d(TAG, "stop running");
} catch (LlcpException e) {
Log.e(TAG, "llcp error", e);
} catch (IOException e) {
Log.e(TAG, "IO error", e);
} finally {
synchronized (NdefPushServer.this) {
if (mServerSocket != null) {
if (DBG) Log.d(TAG, "about to close");
try {
mServerSocket.close();
} catch (IOException e) {
// ignore
}
mServerSocket = null;
}
}
}
synchronized (NdefPushServer.this) {
threadRunning = mRunning;
}
}
}
public void shutdown() {
synchronized (NdefPushServer.this) {
mRunning = false;
if (mServerSocket != null) {
try {
mServerSocket.close();
} catch (IOException e) {
// ignore
}
mServerSocket = null;
}
}
}
}
public void start() {
synchronized (this) {
if (DBG) Log.d(TAG, "start, thread = " + mServerThread);
if (mServerThread == null) {
if (DBG) Log.d(TAG, "starting new server thread");
mServerThread = new ServerThread();
mServerThread.start();
}
}
}
public void stop() {
synchronized (this) {
if (DBG) Log.d(TAG, "stop, thread = " + mServerThread);
if (mServerThread != null) {
if (DBG) Log.d(TAG, "shuting down server thread");
mServerThread.shutdown();
mServerThread = null;
}
}
}
}
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