/**
*
* Copyright 2003-2006 Jive Software.
*
* All rights reserved. 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 org.jivesoftware.smackx.filetransfer;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.packet.XMPPError;
import java.io.*;
/**
* Handles the sending of a file to another user. File transfer's in jabber have
* several steps and there are several methods in this class that handle these
* steps differently.
*
* @author Alexander Wenckus
*
*/
public class OutgoingFileTransfer extends FileTransfer {
private static int RESPONSE_TIMEOUT = 60 * 1000;
private NegotiationProgress callback;
/**
* Returns the time in milliseconds after which the file transfer
* negotiation process will timeout if the other user has not responded.
*
* @return Returns the time in milliseconds after which the file transfer
* negotiation process will timeout if the remote user has not
* responded.
*/
public static int getResponseTimeout() {
return RESPONSE_TIMEOUT;
}
/**
* Sets the time in milliseconds after which the file transfer negotiation
* process will timeout if the other user has not responded.
*
* @param responseTimeout
* The timeout time in milliseconds.
*/
public static void setResponseTimeout(int responseTimeout) {
RESPONSE_TIMEOUT = responseTimeout;
}
private OutputStream outputStream;
private String initiator;
private Thread transferThread;
protected OutgoingFileTransfer(String initiator, String target,
String streamID, FileTransferNegotiator transferNegotiator) {
super(target, streamID, transferNegotiator);
this.initiator = initiator;
}
protected void setOutputStream(OutputStream stream) {
if (outputStream == null) {
this.outputStream = stream;
}
}
/**
* Returns the output stream connected to the peer to transfer the file. It
* is only available after it has been successfully negotiated by the
* {@link StreamNegotiator}.
*
* @return Returns the output stream connected to the peer to transfer the
* file.
*/
protected OutputStream getOutputStream() {
if (getStatus().equals(FileTransfer.Status.negotiated)) {
return outputStream;
} else {
return null;
}
}
/**
* This method handles the negotiation of the file transfer and the stream,
* it only returns the created stream after the negotiation has been completed.
*
* @param fileName
* The name of the file that will be transmitted. It is
* preferable for this name to have an extension as it will be
* used to determine the type of file it is.
* @param fileSize
* The size in bytes of the file that will be transmitted.
* @param description
* A description of the file that will be transmitted.
* @return The OutputStream that is connected to the peer to transmit the
* file.
* @throws XMPPException
* Thrown if an error occurs during the file transfer
* negotiation process.
*/
public synchronized OutputStream sendFile(String fileName, long fileSize,
String description) throws XMPPException {
if (isDone() || outputStream != null) {
throw new IllegalStateException(
"The negotation process has already"
+ " been attempted on this file transfer");
}
try {
setFileInfo(fileName, fileSize);
this.outputStream = negotiateStream(fileName, fileSize, description);
} catch (XMPPException e) {
handleXMPPException(e);
throw e;
}
return outputStream;
}
/**
* This methods handles the transfer and stream negotiation process. It
* returns immediately and its progress will be updated through the
* {@link NegotiationProgress} callback.
*
* @param fileName
* The name of the file that will be transmitted. It is
* preferable for this name to have an extension as it will be
* used to determine the type of file it is.
* @param fileSize
* The size in bytes of the file that will be transmitted.
* @param description
* A description of the file that will be transmitted.
* @param progress
* A callback to monitor the progress of the file transfer
* negotiation process and to retrieve the OutputStream when it
* is complete.
*/
public synchronized void sendFile(final String fileName,
final long fileSize, final String description,
final NegotiationProgress progress)
{
if(progress == null) {
throw new IllegalArgumentException("Callback progress cannot be null.");
}
checkTransferThread();
if (isDone() || outputStream != null) {
throw new IllegalStateException(
"The negotation process has already"
+ " been attempted for this file transfer");
}
setFileInfo(fileName, fileSize);
this.callback = progress;
transferThread = new Thread(new Runnable() {
public void run() {
try {
OutgoingFileTransfer.this.outputStream = negotiateStream(
fileName, fileSize, description);
progress.outputStreamEstablished(OutgoingFileTransfer.this.outputStream);
}
catch (XMPPException e) {
handleXMPPException(e);
}
}
}, "File Transfer Negotiation " + streamID);
transferThread.start();
}
private void checkTransferThread() {
if (transferThread != null && transferThread.isAlive() || isDone()) {
throw new IllegalStateException(
"File transfer in progress or has already completed.");
}
}
/**
* This method handles the stream negotiation process and transmits the file
* to the remote user. It returns immediately and the progress of the file
* transfer can be monitored through several methods:
*
*
* - {@link FileTransfer#getStatus()}
*
- {@link FileTransfer#getProgress()}
*
- {@link FileTransfer#isDone()}
*
*
* @param file the file to transfer to the remote entity.
* @param description a description for the file to transfer.
* @throws XMPPException
* If there is an error during the negotiation process or the
* sending of the file.
*/
public synchronized void sendFile(final File file, final String description)
throws XMPPException {
checkTransferThread();
if (file == null || !file.exists() || !file.canRead()) {
throw new IllegalArgumentException("Could not read file");
} else {
setFileInfo(file.getAbsolutePath(), file.getName(), file.length());
}
transferThread = new Thread(new Runnable() {
public void run() {
try {
outputStream = negotiateStream(file.getName(), file
.length(), description);
} catch (XMPPException e) {
handleXMPPException(e);
return;
}
if (outputStream == null) {
return;
}
if (!updateStatus(Status.negotiated, Status.in_progress)) {
return;
}
InputStream inputStream = null;
try {
inputStream = new FileInputStream(file);
writeToStream(inputStream, outputStream);
} catch (FileNotFoundException e) {
setStatus(FileTransfer.Status.error);
setError(Error.bad_file);
setException(e);
} catch (XMPPException e) {
setStatus(FileTransfer.Status.error);
setException(e);
} finally {
try {
if (inputStream != null) {
inputStream.close();
}
outputStream.flush();
outputStream.close();
} catch (IOException e) {
/* Do Nothing */
}
}
updateStatus(Status.in_progress, FileTransfer.Status.complete);
}
}, "File Transfer " + streamID);
transferThread.start();
}
/**
* This method handles the stream negotiation process and transmits the file
* to the remote user. It returns immediately and the progress of the file
* transfer can be monitored through several methods:
*
*
* - {@link FileTransfer#getStatus()}
*
- {@link FileTransfer#getProgress()}
*
- {@link FileTransfer#isDone()}
*
*
* @param in the stream to transfer to the remote entity.
* @param fileName the name of the file that is transferred
* @param fileSize the size of the file that is transferred
* @param description a description for the file to transfer.
*/
public synchronized void sendStream(final InputStream in, final String fileName, final long fileSize, final String description){
checkTransferThread();
setFileInfo(fileName, fileSize);
transferThread = new Thread(new Runnable() {
public void run() {
//Create packet filter
try {
outputStream = negotiateStream(fileName, fileSize, description);
} catch (XMPPException e) {
handleXMPPException(e);
return;
}
if (outputStream == null) {
return;
}
if (!updateStatus(Status.negotiated, Status.in_progress)) {
return;
}
try {
writeToStream(in, outputStream);
} catch (XMPPException e) {
setStatus(FileTransfer.Status.error);
setException(e);
} finally {
try {
if (in != null) {
in.close();
}
outputStream.flush();
outputStream.close();
} catch (IOException e) {
/* Do Nothing */
}
}
updateStatus(Status.in_progress, FileTransfer.Status.complete);
}
}, "File Transfer " + streamID);
transferThread.start();
}
private void handleXMPPException(XMPPException e) {
XMPPError error = e.getXMPPError();
if (error != null) {
int code = error.getCode();
if (code == 403) {
setStatus(Status.refused);
return;
}
else if (code == 400) {
setStatus(Status.error);
setError(Error.not_acceptable);
}
else {
setStatus(FileTransfer.Status.error);
}
}
setException(e);
}
/**
* Returns the amount of bytes that have been sent for the file transfer. Or
* -1 if the file transfer has not started.
*
* Note: This method is only useful when the {@link #sendFile(File, String)}
* method is called, as it is the only method that actually transmits the
* file.
*
* @return Returns the amount of bytes that have been sent for the file
* transfer. Or -1 if the file transfer has not started.
*/
public long getBytesSent() {
return amountWritten;
}
private OutputStream negotiateStream(String fileName, long fileSize,
String description) throws XMPPException {
// Negotiate the file transfer profile
if (!updateStatus(Status.initial, Status.negotiating_transfer)) {
throw new XMPPException("Illegal state change");
}
StreamNegotiator streamNegotiator = negotiator.negotiateOutgoingTransfer(
getPeer(), streamID, fileName, fileSize, description,
RESPONSE_TIMEOUT);
if (streamNegotiator == null) {
setStatus(Status.error);
setError(Error.no_response);
return null;
}
// Negotiate the stream
if (!updateStatus(Status.negotiating_transfer, Status.negotiating_stream)) {
throw new XMPPException("Illegal state change");
}
outputStream = streamNegotiator.createOutgoingStream(streamID,
initiator, getPeer());
if (!updateStatus(Status.negotiating_stream, Status.negotiated)) {
throw new XMPPException("Illegal state change");
}
return outputStream;
}
public void cancel() {
setStatus(Status.cancelled);
}
@Override
protected boolean updateStatus(Status oldStatus, Status newStatus) {
boolean isUpdated = super.updateStatus(oldStatus, newStatus);
if(callback != null && isUpdated) {
callback.statusUpdated(oldStatus, newStatus);
}
return isUpdated;
}
@Override
protected void setStatus(Status status) {
Status oldStatus = getStatus();
super.setStatus(status);
if(callback != null) {
callback.statusUpdated(oldStatus, status);
}
}
@Override
protected void setException(Exception exception) {
super.setException(exception);
if(callback != null) {
callback.errorEstablishingStream(exception);
}
}
/**
* A callback class to retrieve the status of an outgoing transfer
* negotiation process.
*
* @author Alexander Wenckus
*
*/
public interface NegotiationProgress {
/**
* Called when the status changes
*
* @param oldStatus the previous status of the file transfer.
* @param newStatus the new status of the file transfer.
*/
void statusUpdated(Status oldStatus, Status newStatus);
/**
* Once the negotiation process is completed the output stream can be
* retrieved.
*
* @param stream the established stream which can be used to transfer the file to the remote
* entity
*/
void outputStreamEstablished(OutputStream stream);
/**
* Called when an exception occurs during the negotiation progress.
*
* @param e the exception that occurred.
*/
void errorEstablishingStream(Exception e);
}
}