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/*
* Copyright (c) 2001-2007 Sun Microsystems, Inc. All rights reserved.
*
* The Sun Project JXTA(TM) Software License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by Sun Microsystems, Inc. for JXTA(TM) technology."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
* not be used to endorse or promote products derived from this software
* without prior written permission. For written permission, please contact
* Project JXTA at http://www.jxta.org.
*
* 5. Products derived from this software may not be called "JXTA", nor may
* "JXTA" appear in their name, without prior written permission of Sun.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SUN
* MICROSYSTEMS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* JXTA is a registered trademark of Sun Microsystems, Inc. in the United
* States and other countries.
*
* Please see the license information page at :
* for instructions on use of
* the license in source files.
*
* ====================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of Project JXTA. For more information on Project JXTA, please see
* http://www.jxta.org.
*
* This license is based on the BSD license adopted by the Apache Foundation.
*/
package net.jxta.impl.endpoint.msgframing;
import java.util.logging.Level;
import net.jxta.logging.Logging;
import java.util.logging.Logger;
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.OutputStream;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.text.MessageFormat;
import java.util.ListIterator;
import net.jxta.document.MimeMediaType;
/**
* Header Package for Messages. Analogous to HTTP Headers.
*/
public class MessagePackageHeader {
/**
* Logger
*/
private final static transient Logger LOG = Logger.getLogger(MessagePackageHeader.class.getName());
/**
* Standard header name for content-length
*/
private final static String CONTENT_LENGTH = "content-length";
/**
* Standard header name for content-type
*/
private final static String CONTENT_TYPE = "content-type";
/**
* The maximum size of Header data buffers we will emit.
*/
private final static int MAX_HEADER_LEN = 1024;
/**
* Used for storing individual header elements.
*/
public static class Header {
final String name;
final byte[] value;
public Header(String name, byte[] value) {
this.name = name;
assert value.length <= 65535;
this.value = value;
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return MessageFormat.format("{0} := {1}", name, value);
}
public String getName() {
return name;
}
public byte[] getValue() {
return value;
}
public String getValueString() {
try {
return new String(value, "UTF-8");
} catch (UnsupportedEncodingException never) {
// utf-8 is a required encoding.
throw new Error("UTF-8 encoding support missing!");
}
}
}
/**
* The individual header elements in the order they were read.
*/
private final List headers = new ArrayList();
/**
* Creates a new instance of MessagePackageHeader. Used for outgoing messages.
*/
public MessagePackageHeader() {}
/**
* Creates a new instance of MessagePackageHeader. Used for incoming messages.
*
* @param in The stream from which the headers will be read.
* @throws java.io.IOException if an io error occurs.
*/
public MessagePackageHeader(InputStream in) throws IOException {
boolean sawEmpty = false;
boolean sawLength = false;
boolean sawType = false;
DataInput di = new DataInputStream(in);
// todo 20021014 [email protected] A framing signature would help here.
do {
byte headerNameLength = di.readByte();
if (0 == headerNameLength) {
sawEmpty = true;
} else {
byte[] headerNameBytes = new byte[headerNameLength];
di.readFully(headerNameBytes);
String headerNameString = new String(headerNameBytes, "UTF-8");
if (headerNameString.equalsIgnoreCase(CONTENT_LENGTH)) {
if (sawLength) {
throw new IOException("Duplicate content-length header");
}
sawLength = true;
}
if (headerNameString.equalsIgnoreCase(CONTENT_TYPE)) {
if (sawType) {
throw new IOException("Duplicate content-type header");
}
sawType = true;
}
int headerValueLength = di.readUnsignedShort();
byte[] headerValueBytes = new byte[headerValueLength];
di.readFully(headerValueBytes);
headers.add(new Header(headerNameString, headerValueBytes));
}
} while (!sawEmpty);
if (!sawLength) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("Content Length header was missing");
}
throw new IOException("Content Length header was missing");
}
if (!sawType) {
if (Logging.SHOW_WARNING && LOG.isLoggable(Level.WARNING)) {
LOG.warning("Content Type header was missing");
}
throw new IOException("Content Type header was missing");
}
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
StringBuilder result = new StringBuilder();
result.append('[');
Iterator eachHeader = getHeaders();
while (eachHeader.hasNext()) {
Header aHeader = eachHeader.next();
result.append(" {");
result.append(aHeader);
result.append('}');
if (eachHeader.hasNext()) {
result.append(',');
}
}
result.append(']');
return result.toString();
}
/**
* Returns number of header elements otherwise -1
*
* @param buffer the byte buffer
* @return number of header elements
*/
private int getHeaderCount(ByteBuffer buffer) {
int pos = buffer.position();
int limit = buffer.limit();
int headerCount = 0;
boolean sawZero = false;
while (pos < limit) {
// get header name length
int len = buffer.get(pos) & 0xFF;
pos += 1;
if (0 == len) {
sawZero = true;
break;
}
// advance past name
pos += len;
if ((pos + 2) >= limit) {
// not enough data
break;
}
// get value length
len = buffer.getShort(pos) & 0xFFFF;
pos += 2;
// advance past value
pos += len;
headerCount++;
}
return sawZero ? headerCount : -1;
}
/**
* Reads a Header from a ByteBuffer
*
* @param buffer the input buffer
* @return {@code true} If the header block was completely read.
* @throws IOException if an io error is encountered
*/
public boolean readHeader(ByteBuffer buffer) throws IOException {
if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine(MessageFormat.format("Parsing Package Header from byte buffer :{0}", buffer.toString()));
}
int count = getHeaderCount(buffer);
if (count < 0) {
return false;
}
for (int i = 1; i <= count; i++) {
byte headerNameLength = buffer.get();
byte[] headerNameBytes = new byte[headerNameLength];
buffer.get(headerNameBytes);
String headerNameString = new String(headerNameBytes, "UTF-8");
int headerValueLength = buffer.getShort() & 0x0FFFF; // unsigned
byte[] headerValueBytes = new byte[headerValueLength];
buffer.get(headerValueBytes);
if (Logging.SHOW_FINER && LOG.isLoggable(Level.FINER)) {
LOG.finer(MessageFormat.format("Adding Name {0}: {1}", headerNameString, headerValueBytes));
}
headers.add(new Header(headerNameString, headerValueBytes));
}
// get the end-of-pkg
buffer.get();
if (Logging.SHOW_FINER && LOG.isLoggable(Level.FINER)) {
LOG.finer(MessageFormat.format("Parsed {0} header elements, buffer stats :{1}", count, buffer.toString()));
}
return true;
}
/**
* Add a header.
*
* @param name The header name. The UTF-8 encoded representation of this
* name may not be longer than 255 bytes.
* @param value The value for the header. May not exceed 65535 bytes in
* length.
*/
public void addHeader(String name, byte[] value) {
if (name.length() > 255) {
throw new IllegalArgumentException("name may not exceed 255 bytes in length.");
}
if (value.length > 65535) {
throw new IllegalArgumentException("value may not exceed 65535 bytes in length.");
}
if (Logging.SHOW_FINER && LOG.isLoggable(Level.FINER)) {
LOG.finer("Add header :" + name + "(" + name.length() + ") with " + value.length + " bytes of value");
}
headers.add(new Header(name, value));
}
/**
* Add a header.
*
* @param name The header name. The UTF-8 encoded representation of this
* name may not be longer than 255 bytes.
* @param value The value for the header. May not exceed 65535 bytes in
* length.
*/
public void addHeader(String name, String value) {
if (Logging.SHOW_FINER && LOG.isLoggable(Level.FINER)) {
LOG.finer("Add header :" + name + "(" + name.length() + ") with " + value.length() + " chars of value");
}
try {
addHeader(name, value.getBytes("UTF-8"));
} catch (UnsupportedEncodingException never) {
// utf-8 is a required encoding.
throw new IllegalStateException("UTF-8 encoding support missing!");
}
}
/**
* Replace a header. Replaces all existing headers with the same name.
*
* @param name The header name. The UTF-8 encoded representation of this
* name may not be longer than 255 bytes.
* @param value The value for the header. May not exceed 65535 bytes in
* length.
*/
public void replaceHeader(String name, byte[] value) {
if (name.length() > 255) {
throw new IllegalArgumentException("name may not exceed 255 bytes in length.");
}
if (value.length > 65535) {
throw new IllegalArgumentException("value may not exceed 65535 bytes in length.");
}
if (Logging.SHOW_FINER && LOG.isLoggable(Level.FINER)) {
LOG.finer("Replace header :" + name + "(" + name.length() + ") with " + value.length + " bytes of value");
}
Header newHeader = new Header(name, value);
ListIterator eachHeader = getHeaders();
boolean replaced = false;
while (eachHeader.hasNext()) {
Header aHeader = eachHeader.next();
if (aHeader.getName().equalsIgnoreCase(name)) {
eachHeader.set(newHeader);
replaced = true;
}
}
if(!replaced) {
headers.add(newHeader);
}
}
/**
* Replace a header. Replaces all existing headers with the same name
*
* @param name The header name. The UTF-8 encoded representation of this
* name may not be longer than 255 bytes.
* @param value The value for the header. May not exceed 65535 bytes in
* length.
*/
public void replaceHeader(String name, String value) {
if (Logging.SHOW_FINER && LOG.isLoggable(Level.FINER)) {
LOG.finer("Replace header :" + name + "(" + name.length() + ") with " + value.length() + " chars of value");
}
try {
replaceHeader(name, value.getBytes("UTF-8"));
} catch (UnsupportedEncodingException never) {
// utf-8 is a required encoding.
throw new IllegalStateException("UTF-8 encoding support missing!");
}
}
/**
* Gets all of the headers. This iterator provides access to the live
* data of this instance. Modifying the headers using {@code add()},
* {@code set()}, {@code remove()} is permitted.
*
* @return all of the headers
*/
public ListIterator getHeaders() {
return headers.listIterator();
}
/**
* Gets all of the headers matching the specified name
*
* @param name the name of the header we are seeking.
*/
public Iterator getHeader(String name) {
List matchingHeaders = new ArrayList();
for (Header aHeader : headers) {
if (name.equals(aHeader.getName())) {
matchingHeaders.add(aHeader);
}
}
return matchingHeaders.iterator();
}
/**
* Write this group of header elements to a stream.
*
* @param out the stream to send the headers to.
* @throws java.io.IOException if an io error occurs
*/
public void sendToStream(OutputStream out) throws IOException {
Iterator eachHeader = getHeaders();
DataOutput dos = new DataOutputStream(out);
// todo 20021014 [email protected] A framing signature would help here
while (eachHeader.hasNext()) {
Header aHeader = eachHeader.next();
byte[] nameBytes = aHeader.getName().getBytes("UTF-8");
byte[] value = aHeader.getValue();
assert nameBytes.length <= 255;
assert value.length <= 65535;
dos.write(nameBytes.length);
dos.write(nameBytes);
dos.writeShort(value.length);
dos.write(value);
}
// write empty header
dos.write(0);
}
/**
* Return a ByteBuffer representing this group of header elements.
*
* @return ByteBuffer representing this Header
*/
public ByteBuffer getByteBuffer() {
// note: according to the spec this may exceed MAX_HEADER_LEN,
// but since there are practically only 3 header elements used
// it's safe to assume this implemention detail.
ByteBuffer buffer = ByteBuffer.allocate(MAX_HEADER_LEN);
for (Header header : headers) {
byte[] name;
try {
name = header.getName().getBytes("UTF-8");
} catch (UnsupportedEncodingException never) {
throw new Error("Required UTF-8 encoding not available.");
}
byte[] value = header.getValue();
assert name.length <= 255;
assert value.length <= 65535;
buffer.put((byte) name.length);
buffer.put(name);
buffer.putShort((short) value.length);
buffer.put(value);
}
// write empty header
buffer.put((byte) 0);
buffer.flip();
return buffer;
}
/**
* Convenience method setting the "{@code content-length}" header.
*
* @param length length of the message.
*/
public void setContentLengthHeader(long length) {
byte[] lengthAsBytes = new byte[8];
for (int eachByte = 0; eachByte < 8; eachByte++) {
lengthAsBytes[eachByte] = (byte) (length >> ((7 - eachByte) * 8L));
}
replaceHeader(CONTENT_LENGTH, lengthAsBytes);
}
/**
* Convenience method for getting the "{@code content-length}" header.
*
* @return length from the header or -1 if there was no
* {@code content-length} header element.
*/
public long getContentLengthHeader() {
Iterator it = getHeader(CONTENT_LENGTH);
if (!it.hasNext()) {
return -1L;
}
Header header = it.next();
byte[] lengthAsBytes = header.getValue();
long lengthAsLong = 0L;
for (int eachByte = 0; eachByte < 8; eachByte++) {
lengthAsLong |= ((long) (lengthAsBytes[eachByte] & 0xff)) << ((7 - eachByte) * 8L);
}
return lengthAsLong;
}
/**
* Convenience method for setting the "{@code content-type}" header.
*
* @param type type of the message.
*/
public void setContentTypeHeader(MimeMediaType type) {
replaceHeader(CONTENT_TYPE, type.toString());
}
/**
* Convenience method for getting the "{@code content-type}" header.
*
* @return type from the header or "{@code application/octet-stream}" if
* there was no {@code content-type} header.
*/
public MimeMediaType getContentTypeHeader() {
Iterator it = getHeader(CONTENT_TYPE);
if (!it.hasNext()) {
// return the generic type. Better than returning "null".
return MimeMediaType.AOS;
}
Header header = it.next();
return MimeMediaType.valueOf(header.getValueString());
}
}
