org.apache.activemq.transport.stomp.StompWireFormat Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of activemq-osgi Show documentation
Show all versions of activemq-osgi Show documentation
Puts together an ActiveMQ OSGi bundle
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.activemq.transport.stomp;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.util.HashMap;
import java.util.Map;
import org.apache.activemq.util.ByteArrayInputStream;
import org.apache.activemq.util.ByteArrayOutputStream;
import org.apache.activemq.util.ByteSequence;
import org.apache.activemq.wireformat.WireFormat;
/**
* Implements marshalling and unmarsalling the Stomp protocol.
*/
public class StompWireFormat implements WireFormat {
private static final byte[] NO_DATA = new byte[] {};
private static final byte[] END_OF_FRAME = new byte[] {0, '\n'};
private static final int MAX_COMMAND_LENGTH = 1024;
private static final int MAX_HEADER_LENGTH = 1024 * 10;
private static final int MAX_HEADERS = 1000;
private static final int MAX_DATA_LENGTH = 1024 * 1024 * 100;
private int version = 1;
private int maxDataLength = MAX_DATA_LENGTH;
private String stompVersion = Stomp.DEFAULT_VERSION;
@Override
public ByteSequence marshal(Object command) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
marshal(command, dos);
dos.close();
return baos.toByteSequence();
}
@Override
public Object unmarshal(ByteSequence packet) throws IOException {
ByteArrayInputStream stream = new ByteArrayInputStream(packet);
DataInputStream dis = new DataInputStream(stream);
return unmarshal(dis);
}
@Override
public void marshal(Object command, DataOutput os) throws IOException {
StompFrame stomp = (org.apache.activemq.transport.stomp.StompFrame)command;
if (stomp.getAction().equals(Stomp.Commands.KEEPALIVE)) {
os.write(Stomp.BREAK);
return;
}
StringBuilder buffer = new StringBuilder();
buffer.append(stomp.getAction());
buffer.append(Stomp.NEWLINE);
// Output the headers.
for (Map.Entry entry : stomp.getHeaders().entrySet()) {
buffer.append(entry.getKey());
buffer.append(Stomp.Headers.SEPERATOR);
buffer.append(encodeHeader(entry.getValue()));
buffer.append(Stomp.NEWLINE);
}
// Add a newline to seperate the headers from the content.
buffer.append(Stomp.NEWLINE);
os.write(buffer.toString().getBytes("UTF-8"));
os.write(stomp.getContent());
os.write(END_OF_FRAME);
}
@Override
public Object unmarshal(DataInput in) throws IOException {
try {
// parse action
String action = parseAction(in);
// Parse the headers
HashMap headers = parseHeaders(in);
// Read in the data part.
byte[] data = NO_DATA;
String contentLength = headers.get(Stomp.Headers.CONTENT_LENGTH);
if ((action.equals(Stomp.Commands.SEND) || action.equals(Stomp.Responses.MESSAGE)) && contentLength != null) {
// Bless the client, he's telling us how much data to read in.
int length = parseContentLength(contentLength);
data = new byte[length];
in.readFully(data);
if (in.readByte() != 0) {
throw new ProtocolException(Stomp.Headers.CONTENT_LENGTH + " bytes were read and " + "there was no trailing null byte", true);
}
} else {
// We don't know how much to read.. data ends when we hit a 0
byte b;
ByteArrayOutputStream baos = null;
while ((b = in.readByte()) != 0) {
if (baos == null) {
baos = new ByteArrayOutputStream();
} else if (baos.size() > getMaxDataLength()) {
throw new ProtocolException("The maximum data length was exceeded", true);
}
baos.write(b);
}
if (baos != null) {
baos.close();
data = baos.toByteArray();
}
}
return new StompFrame(action, headers, data);
} catch (ProtocolException e) {
return new StompFrameError(e);
}
}
private String readLine(DataInput in, int maxLength, String errorMessage) throws IOException {
ByteSequence sequence = readHeaderLine(in, maxLength, errorMessage);
return new String(sequence.getData(), sequence.getOffset(), sequence.getLength(), "UTF-8").trim();
}
private ByteSequence readHeaderLine(DataInput in, int maxLength, String errorMessage) throws IOException {
byte b;
ByteArrayOutputStream baos = new ByteArrayOutputStream(maxLength);
while ((b = in.readByte()) != '\n') {
if (baos.size() > maxLength) {
baos.close();
throw new ProtocolException(errorMessage, true);
}
baos.write(b);
}
baos.close();
ByteSequence line = baos.toByteSequence();
if (stompVersion.equals(Stomp.V1_0) || stompVersion.equals(Stomp.V1_2)) {
int lineLength = line.getLength();
if (lineLength > 0 && line.data[lineLength-1] == '\r') {
line.setLength(lineLength-1);
}
}
return line;
}
protected String parseAction(DataInput in) throws IOException {
String action = null;
// skip white space to next real action line
while (true) {
action = readLine(in, MAX_COMMAND_LENGTH, "The maximum command length was exceeded");
if (action == null) {
throw new IOException("connection was closed");
} else {
action = action.trim();
if (action.length() > 0) {
break;
}
}
}
return action;
}
protected HashMap parseHeaders(DataInput in) throws IOException {
HashMap headers = new HashMap(25);
while (true) {
ByteSequence line = readHeaderLine(in, MAX_HEADER_LENGTH, "The maximum header length was exceeded");
if (line != null && line.length > 1) {
if (headers.size() > MAX_HEADERS) {
throw new ProtocolException("The maximum number of headers was exceeded", true);
}
try {
ByteArrayInputStream headerLine = new ByteArrayInputStream(line);
ByteArrayOutputStream stream = new ByteArrayOutputStream(line.length);
// First complete the name
int result = -1;
while ((result = headerLine.read()) != -1) {
if (result != ':') {
stream.write(result);
} else {
break;
}
}
ByteSequence nameSeq = stream.toByteSequence();
String name = new String(nameSeq.getData(), nameSeq.getOffset(), nameSeq.getLength(), "UTF-8");
String value = decodeHeader(headerLine);
if (stompVersion.equals(Stomp.V1_0)) {
value = value.trim();
}
if (!headers.containsKey(name)) {
headers.put(name, value);
}
stream.close();
} catch (Exception e) {
throw new ProtocolException("Unable to parser header line [" + line + "]", true);
}
} else {
break;
}
}
return headers;
}
protected int parseContentLength(String contentLength) throws ProtocolException {
int length;
try {
length = Integer.parseInt(contentLength.trim());
} catch (NumberFormatException e) {
throw new ProtocolException("Specified content-length is not a valid integer", true);
}
if (length > getMaxDataLength()) {
throw new ProtocolException("The maximum data length was exceeded", true);
}
return length;
}
private String encodeHeader(String header) throws IOException {
String result = header;
if (!stompVersion.equals(Stomp.V1_0)) {
byte[] utf8buf = header.getBytes("UTF-8");
ByteArrayOutputStream stream = new ByteArrayOutputStream(utf8buf.length);
for(byte val : utf8buf) {
switch(val) {
case Stomp.ESCAPE:
stream.write(Stomp.ESCAPE_ESCAPE_SEQ);
break;
case Stomp.BREAK:
stream.write(Stomp.NEWLINE_ESCAPE_SEQ);
break;
case Stomp.COLON:
stream.write(Stomp.COLON_ESCAPE_SEQ);
break;
default:
stream.write(val);
}
}
result = new String(stream.toByteArray(), "UTF-8");
stream.close();
}
return result;
}
private String decodeHeader(InputStream header) throws IOException {
ByteArrayOutputStream decoded = new ByteArrayOutputStream();
PushbackInputStream stream = new PushbackInputStream(header);
int value = -1;
while( (value = stream.read()) != -1) {
if (value == 92) {
int next = stream.read();
if (next != -1) {
switch(next) {
case 110:
decoded.write(Stomp.BREAK);
break;
case 99:
decoded.write(Stomp.COLON);
break;
case 92:
decoded.write(Stomp.ESCAPE);
break;
default:
stream.unread(next);
decoded.write(value);
}
} else {
decoded.write(value);
}
} else {
decoded.write(value);
}
}
decoded.close();
return new String(decoded.toByteArray(), "UTF-8");
}
@Override
public int getVersion() {
return version;
}
@Override
public void setVersion(int version) {
this.version = version;
}
public String getStompVersion() {
return stompVersion;
}
public void setStompVersion(String stompVersion) {
this.stompVersion = stompVersion;
}
public void setMaxDataLength(int maxDataLength) {
this.maxDataLength = maxDataLength;
}
public int getMaxDataLength() {
return maxDataLength;
}
}