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package eu.siacs.conversations.xmpp.jingle;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import android.util.Base64;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.DownloadableFile;
import eu.siacs.conversations.utils.CryptoHelper;
import eu.siacs.conversations.xml.Element;
import eu.siacs.conversations.xmpp.OnIqPacketReceived;
import eu.siacs.conversations.xmpp.stanzas.IqPacket;
public class JingleInbandTransport extends JingleTransport {
private Account account;
private String counterpart;
private int blockSize;
private int bufferSize;
private int seq = 0;
private String sessionId;
private boolean established = false;
private DownloadableFile file;
private InputStream fileInputStream = null;
private OutputStream fileOutputStream;
private long remainingSize;
private MessageDigest digest;
private OnFileTransmissionStatusChanged onFileTransmissionStatusChanged;
private OnIqPacketReceived onAckReceived = new OnIqPacketReceived() {
@Override
public void onIqPacketReceived(Account account, IqPacket packet) {
if (packet.getType() == IqPacket.TYPE_RESULT) {
sendNextBlock();
}
}
};
public JingleInbandTransport(Account account, String counterpart,
String sid, int blocksize) {
this.account = account;
this.counterpart = counterpart;
this.blockSize = blocksize;
this.bufferSize = blocksize / 4;
this.sessionId = sid;
}
public void connect(final OnTransportConnected callback) {
IqPacket iq = new IqPacket(IqPacket.TYPE_SET);
iq.setTo(this.counterpart);
Element open = iq.addChild("open", "http://jabber.org/protocol/ibb");
open.setAttribute("sid", this.sessionId);
open.setAttribute("stanza", "iq");
open.setAttribute("block-size", Integer.toString(this.blockSize));
this.account.getXmppConnection().sendIqPacket(iq,
new OnIqPacketReceived() {
@Override
public void onIqPacketReceived(Account account,
IqPacket packet) {
if (packet.getType() == IqPacket.TYPE_ERROR) {
callback.failed();
} else {
callback.established();
}
}
});
}
@Override
public void receive(DownloadableFile file,
OnFileTransmissionStatusChanged callback) {
this.onFileTransmissionStatusChanged = callback;
this.file = file;
try {
this.digest = MessageDigest.getInstance("SHA-1");
digest.reset();
file.getParentFile().mkdirs();
file.createNewFile();
this.fileOutputStream = file.createOutputStream();
if (this.fileOutputStream == null) {
callback.onFileTransferAborted();
return;
}
this.remainingSize = file.getExpectedSize();
} catch (NoSuchAlgorithmException e) {
callback.onFileTransferAborted();
} catch (IOException e) {
callback.onFileTransferAborted();
}
}
@Override
public void send(DownloadableFile file,
OnFileTransmissionStatusChanged callback) {
this.onFileTransmissionStatusChanged = callback;
this.file = file;
try {
this.digest = MessageDigest.getInstance("SHA-1");
this.digest.reset();
fileInputStream = this.file.createInputStream();
if (fileInputStream == null) {
callback.onFileTransferAborted();
return;
}
this.sendNextBlock();
} catch (NoSuchAlgorithmException e) {
callback.onFileTransferAborted();
}
}
private void sendNextBlock() {
byte[] buffer = new byte[this.bufferSize];
try {
int count = fileInputStream.read(buffer);
if (count == -1) {
file.setSha1Sum(CryptoHelper.bytesToHex(digest.digest()));
fileInputStream.close();
this.onFileTransmissionStatusChanged.onFileTransmitted(file);
} else {
this.digest.update(buffer);
String base64 = Base64.encodeToString(buffer, Base64.NO_WRAP);
IqPacket iq = new IqPacket(IqPacket.TYPE_SET);
iq.setTo(this.counterpart);
Element data = iq.addChild("data",
"http://jabber.org/protocol/ibb");
data.setAttribute("seq", Integer.toString(this.seq));
data.setAttribute("block-size",
Integer.toString(this.blockSize));
data.setAttribute("sid", this.sessionId);
data.setContent(base64);
this.account.getXmppConnection().sendIqPacket(iq,
this.onAckReceived);
this.seq++;
}
} catch (IOException e) {
this.onFileTransmissionStatusChanged.onFileTransferAborted();
}
}
private void receiveNextBlock(String data) {
try {
byte[] buffer = Base64.decode(data, Base64.NO_WRAP);
if (this.remainingSize < buffer.length) {
buffer = Arrays
.copyOfRange(buffer, 0, (int) this.remainingSize);
}
this.remainingSize -= buffer.length;
this.fileOutputStream.write(buffer);
this.digest.update(buffer);
if (this.remainingSize <= 0) {
file.setSha1Sum(CryptoHelper.bytesToHex(digest.digest()));
fileOutputStream.flush();
fileOutputStream.close();
this.onFileTransmissionStatusChanged.onFileTransmitted(file);
}
} catch (IOException e) {
this.onFileTransmissionStatusChanged.onFileTransferAborted();
}
}
public void deliverPayload(IqPacket packet, Element payload) {
if (payload.getName().equals("open")) {
if (!established) {
established = true;
this.account.getXmppConnection().sendIqPacket(
packet.generateRespone(IqPacket.TYPE_RESULT), null);
} else {
this.account.getXmppConnection().sendIqPacket(
packet.generateRespone(IqPacket.TYPE_ERROR), null);
}
} else if (payload.getName().equals("data")) {
this.receiveNextBlock(payload.getContent());
this.account.getXmppConnection().sendIqPacket(
packet.generateRespone(IqPacket.TYPE_RESULT), null);
} else {
// TODO some sort of exception
}
}
}
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