/*
* 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.artemis.core.protocol.stomp;
import java.util.HashMap;
import java.util.Map;
import org.apache.activemq.artemis.api.core.ActiveMQBuffer;
import static org.apache.activemq.artemis.core.protocol.stomp.ActiveMQStompProtocolMessageBundle.BUNDLE;
public class StompDecoder {
public static final boolean TRIM_LEADING_HEADER_VALUE_WHITESPACE = true;
public static final String COMMAND_ABORT = Stomp.Commands.ABORT;
public static final int COMMAND_ABORT_LENGTH = COMMAND_ABORT.length();
public static final String COMMAND_ACK = Stomp.Commands.ACK;
public static final int COMMAND_ACK_LENGTH = COMMAND_ACK.length();
public static final String COMMAND_NACK = Stomp.Commands.NACK;
public static final int COMMAND_NACK_LENGTH = COMMAND_NACK.length();
public static final String COMMAND_BEGIN = Stomp.Commands.BEGIN;
public static final int COMMAND_BEGIN_LENGTH = COMMAND_BEGIN.length();
public static final String COMMAND_COMMIT = Stomp.Commands.COMMIT;
public static final int COMMAND_COMMIT_LENGTH = COMMAND_COMMIT.length();
public static final String COMMAND_CONNECT = Stomp.Commands.CONNECT;
public static final int COMMAND_CONNECT_LENGTH = COMMAND_CONNECT.length();
public static final String COMMAND_DISCONNECT = Stomp.Commands.DISCONNECT;
public static final int COMMAND_DISCONNECT_LENGTH = COMMAND_DISCONNECT.length();
public static final String COMMAND_SEND = Stomp.Commands.SEND;
public static final int COMMAND_SEND_LENGTH = COMMAND_SEND.length();
public static final String COMMAND_STOMP = Stomp.Commands.STOMP;
public static final int COMMAND_STOMP_LENGTH = COMMAND_STOMP.length();
public static final String COMMAND_SUBSCRIBE = Stomp.Commands.SUBSCRIBE;
public static final int COMMAND_SUBSCRIBE_LENGTH = COMMAND_SUBSCRIBE.length();
public static final String COMMAND_UNSUBSCRIBE = Stomp.Commands.UNSUBSCRIBE;
public static final int COMMAND_UNSUBSCRIBE_LENGTH = COMMAND_UNSUBSCRIBE.length();
/**
* * added by meddy, 27 april 2011, handle header parser for reply to websocket protocol ***
*/
public static final String COMMAND_CONNECTED = Stomp.Responses.CONNECTED;
public static final int COMMAND_CONNECTED_LENGTH = COMMAND_CONNECTED.length();
public static final String COMMAND_MESSAGE = Stomp.Responses.MESSAGE;
public static final int COMMAND_MESSAGE_LENGTH = COMMAND_MESSAGE.length();
public static final String COMMAND_ERROR = Stomp.Responses.ERROR;
public static final int COMMAND_ERROR_LENGTH = COMMAND_ERROR.length();
public static final String COMMAND_RECEIPT = Stomp.Responses.RECEIPT;
public static final int COMMAND_RECEIPT_LENGTH = COMMAND_RECEIPT.length();
/**
* * end ***
*/
public static final byte A = (byte) 'A';
public static final byte B = (byte) 'B';
public static final byte C = (byte) 'C';
public static final byte c = (byte) 'c';
public static final byte D = (byte) 'D';
public static final byte E = (byte) 'E';
public static final byte T = (byte) 'T';
public static final byte M = (byte) 'M';
public static final byte S = (byte) 'S';
public static final byte R = (byte) 'R';
public static final byte U = (byte) 'U';
public static final byte N = (byte) 'N';
public static final byte LN = (byte) 'n';
public static final byte RT = (byte) 'r';
public static final byte HEADER_SEPARATOR = (byte) ':';
public static final byte NEW_LINE = (byte) '\n';
public static final byte CR = (byte) '\r';
public static final byte SPACE = (byte) ' ';
public static final byte TAB = (byte) '\t';
public byte[] workingBuffer = new byte[1024];
public int pos;
public int data;
public String command;
public Map<String, String> headers;
private int headerBytesCopyStart;
public boolean readingHeaders;
public boolean headerValueWhitespace;
public boolean inHeaderName;
public String headerName;
public boolean whiteSpaceOnly;
public int contentLength;
public String contentType;
public int bodyStart;
//max len of EOL (default is 1 for '\n')
protected int eolLen = 1;
protected final VersionedStompFrameHandler handler;
public StompDecoder(VersionedStompFrameHandler handler) {
this.handler = handler;
}
public boolean hasBytes() {
return data > pos;
}
/*
* Stomp format is a command on the first line
* followed by a set of headers NAME:VALUE
* followed by an empty line
* followed by an optional message body
* terminated with a null character
*
* Note: This is the decoder for 1.0 stomp frames. However to support for stomp 1.1
* and 1.2, it is also responsible for giving out a proper exception when it detects
* unsupported EOLs ("\r\n" valid for 1.2 only). The StompConnection will switch
* to proper version decoders on catching such exceptions.
*/
public synchronized StompFrame decode(final ActiveMQBuffer buffer) throws ActiveMQStompException {
int readable = buffer.readableBytes();
if (data + readable >= workingBuffer.length) {
resizeWorking(data + readable);
}
buffer.readBytes(workingBuffer, data, readable);
data += readable;
if (command == null) {
if (!parseCommand()) {
return null;
}
}
//if command is not null, should it automatically be in
//reading headers mode? think of get rid of readingHeaders flag
if (readingHeaders) {
if (!parseHeaders()) {
return null;
}
}
// Now the body
StompFrame ret = parseBody();
return ret;
}
protected StompFrame parseBody() throws ActiveMQStompException {
byte[] content = null;
if (contentLength != -1) {
if (pos + contentLength + 1 > data) {
// Need more bytes
} else {
content = new byte[contentLength];
System.arraycopy(workingBuffer, pos, content, 0, contentLength);
pos += contentLength + 1;
}
} else {
// Need to scan for terminating NUL
if (bodyStart == -1) {
bodyStart = pos;
}
while (pos < data) {
if (workingBuffer[pos++] == 0) {
content = new byte[pos - bodyStart - 1];
System.arraycopy(workingBuffer, bodyStart, content, 0, content.length);
break;
}
}
}
if (content != null) {
if (data > pos) {
if (workingBuffer[pos] == NEW_LINE)
pos++;
if (data > pos)
// More data still in the buffer from the next packet
System.arraycopy(workingBuffer, pos, workingBuffer, 0, data - pos);
}
data = data - pos;
// reset
StompFrame ret = handler.createStompFrame(command);
ret.headers = headers;
ret.setByteBody(content);
init();
return ret;
} else {
return null;
}
}
protected boolean parseHeaders() throws ActiveMQStompException {
if (headerBytesCopyStart == -1) {
headerBytesCopyStart = pos;
}
// Now the headers
outer:
while (true) {
byte b = workingBuffer[pos++];
switch (b) {
case HEADER_SEPARATOR: {
if (inHeaderName) {
headerName = new String(workingBuffer, headerBytesCopyStart, pos - headerBytesCopyStart - 1);
inHeaderName = false;
headerBytesCopyStart = pos;
headerValueWhitespace = true;
}
whiteSpaceOnly = false;
break;
}
case NEW_LINE: {
if (whiteSpaceOnly) {
// Headers are terminated by a blank line
readingHeaders = false;
break outer;
}
String headerValue = new String(workingBuffer, headerBytesCopyStart, pos - headerBytesCopyStart - 1);
headers.put(headerName, headerValue);
if (headerName.equals(Stomp.Headers.CONTENT_LENGTH)) {
contentLength = Integer.parseInt(headerValue);
}
whiteSpaceOnly = true;
headerBytesCopyStart = pos;
inHeaderName = true;
headerValueWhitespace = false;
break;
}
case SPACE: {
}
case TAB: {
if (TRIM_LEADING_HEADER_VALUE_WHITESPACE && headerValueWhitespace) {
// trim off leading whitespace from header values.
// The STOMP spec examples seem to imply that whitespace should be trimmed although it is not
// explicit in the spec
// ActiveMQ Artemis + StompConnect also seem to trim whitespace from header values.
// Trimming is problematic though if the user has set a header with a value which deliberately
// has
// leading whitespace since
// this will be removed
headerBytesCopyStart++;
}
break;
}
default: {
whiteSpaceOnly = false;
headerValueWhitespace = false;
}
}
if (pos == data) {
// Run out of data
return false;
}
}
return true;
}
protected boolean parseCommand() throws ActiveMQStompException {
int offset = 0;
boolean nextChar = false;
// Some badly behaved STOMP clients add a \n *after* the terminating NUL char at the end of the
// STOMP frame this can manifest as an extra \n at the beginning when the
// next STOMP frame is read - we need to deal with this.
// Besides, Stomp 1.2 allows for extra EOLs after NULL (i.e.
// either "[\r]\n"s or "\n"s)
while (offset < data) {
if (workingBuffer[offset] == NEW_LINE) {
nextChar = false;
} else if (workingBuffer[offset] == CR) {
if (nextChar)
throw BUNDLE.invalidTwoCRs().setHandler(handler);
nextChar = true;
} else {
break;
}
offset++;
}
if (nextChar) {
throw BUNDLE.badCRs().setHandler(handler);
}
if (data < 4 + offset) {
// Need at least four bytes to identify the command
// - up to 3 bytes for the command name + potentially another byte for a leading \n
return false;
}
byte b = workingBuffer[offset];
switch (b) {
case A: {
if (workingBuffer[offset + 1] == B) {
if (!tryIncrement(offset + COMMAND_ABORT_LENGTH + 1)) {
return false;
}
// ABORT
command = COMMAND_ABORT;
} else {
if (!tryIncrement(offset + COMMAND_ACK_LENGTH + 1)) {
return false;
}
// ACK
command = COMMAND_ACK;
}
break;
}
case B: {
if (!tryIncrement(offset + COMMAND_BEGIN_LENGTH + 1)) {
return false;
}
// BEGIN
command = COMMAND_BEGIN;
break;
}
case C: {
if (workingBuffer[offset + 2] == M) {
if (!tryIncrement(offset + COMMAND_COMMIT_LENGTH + 1)) {
return false;
}
// COMMIT
command = COMMAND_COMMIT;
} else if (workingBuffer[offset + 7] == E) {
if (!tryIncrement(offset + COMMAND_CONNECTED_LENGTH + 1)) {
return false;
}
// CONNECTED
command = COMMAND_CONNECTED;
} else {
if (!tryIncrement(offset + COMMAND_CONNECT_LENGTH + 1)) {
return false;
}
// CONNECT
command = COMMAND_CONNECT;
}
break;
}
case D: {
if (!tryIncrement(offset + COMMAND_DISCONNECT_LENGTH + 1)) {
return false;
}
// DISCONNECT
command = COMMAND_DISCONNECT;
break;
}
case R: {
if (!tryIncrement(offset + COMMAND_RECEIPT_LENGTH + 1)) {
return false;
}
// RECEIPT
command = COMMAND_RECEIPT;
break;
}
/**** added by meddy, 27 april 2011, handle header parser for reply to websocket protocol ****/
case E: {
if (!tryIncrement(offset + COMMAND_ERROR_LENGTH + 1)) {
return false;
}
// ERROR
command = COMMAND_ERROR;
break;
}
case M: {
if (!tryIncrement(offset + COMMAND_MESSAGE_LENGTH + 1)) {
return false;
}
// MESSAGE
command = COMMAND_MESSAGE;
break;
}
/**** end ****/
case S: {
if (workingBuffer[offset + 1] == E) {
if (!tryIncrement(offset + COMMAND_SEND_LENGTH + 1)) {
return false;
}
// SEND
command = COMMAND_SEND;
} else if (workingBuffer[offset + 1] == T) {
if (!tryIncrement(offset + COMMAND_STOMP_LENGTH + 1)) {
return false;
}
// STOMP
command = COMMAND_STOMP;
} else {
if (!tryIncrement(offset + COMMAND_SUBSCRIBE_LENGTH + 1)) {
return false;
}
// SUBSCRIBE
command = COMMAND_SUBSCRIBE;
}
break;
}
case U: {
if (!tryIncrement(offset + COMMAND_UNSUBSCRIBE_LENGTH + 1)) {
return false;
}
// UNSUBSCRIBE
command = COMMAND_UNSUBSCRIBE;
break;
}
default: {
throwInvalid();
}
}
// Sanity check
if (workingBuffer[pos - 1] != NEW_LINE) {
//give a signal to try other versions
ActiveMQStompException error = BUNDLE.notValidNewLine(workingBuffer[pos - 1]).setHandler(handler);
error.setCode(ActiveMQStompException.INVALID_EOL_V10);
error.setBody(BUNDLE.unexpectedNewLine(workingBuffer[pos - 1]));
throw error;
}
return true;
}
public void throwInvalid() throws ActiveMQStompException {
ActiveMQStompException error = BUNDLE.invalidCommand(this.dumpByteArray(workingBuffer)).setHandler(handler);
error.setCode(ActiveMQStompException.INVALID_COMMAND);
error.setBody(BUNDLE.invalidFrame(this.dumpByteArray(workingBuffer)));
throw error;
}
public void init() {
pos = 0;
command = null;
headers = new HashMap<>();
this.headerBytesCopyStart = -1;
readingHeaders = true;
inHeaderName = true;
headerValueWhitespace = false;
headerName = null;
whiteSpaceOnly = true;
contentLength = -1;
contentType = null;
bodyStart = -1;
}
public void resizeWorking(final int newSize) {
byte[] oldBuffer = workingBuffer;
workingBuffer = new byte[newSize];
System.arraycopy(oldBuffer, 0, workingBuffer, 0, oldBuffer.length);
}
public boolean tryIncrement(final int length) {
if (pos + length >= data) {
return false;
} else {
pos += length;
return true;
}
}
private String dumpByteArray(final byte[] bytes) {
StringBuilder str = new StringBuilder();
for (int i = 0; i < data; i++) {
char b = (char) bytes[i];
if (b < 33 || b > 136) {
//Unreadable characters
str.append(bytes[i]);
} else {
str.append(b);
}
if (i != bytes.length - 1) {
str.append(",");
}
}
return str.toString();
}
/**
* This should be overridden by subclasses.
*/
public void init(StompDecoder decoder) {
}
}