/*
* 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.coyote.http11;
import java.io.IOException;
import java.io.OutputStream;
import java.security.AccessController;
import java.security.PrivilegedAction;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.CharChunk;
import org.apache.tomcat.util.buf.MessageBytes;
import org.apache.tomcat.util.http.HttpMessages;
import org.apache.tomcat.util.http.MimeHeaders;
import org.apache.tomcat.util.res.StringManager;
import org.apache.coyote.ActionCode;
import org.apache.coyote.OutputBuffer;
import org.apache.coyote.Response;
import org.apache.coyote.http11.filters.GzipOutputFilter;
/**
* Output buffer.
*
* @author <a href="mailto:remm@apache.org">Remy Maucherat</a>
*/
public class InternalOutputBuffer
implements OutputBuffer, ByteChunk.ByteOutputChannel {
// -------------------------------------------------------------- Constants
// ----------------------------------------------------------- Constructors
/**
* Default constructor.
*/
public InternalOutputBuffer(Response response) {
this(response, Constants.DEFAULT_HTTP_HEADER_BUFFER_SIZE);
}
/**
* Alternate constructor.
*/
public InternalOutputBuffer(Response response, int headerBufferSize) {
this.response = response;
headers = response.getMimeHeaders();
buf = new byte[headerBufferSize];
outputStreamOutputBuffer = new OutputStreamOutputBuffer();
filterLibrary = new OutputFilter[0];
activeFilters = new OutputFilter[0];
lastActiveFilter = -1;
socketBuffer = new ByteChunk();
socketBuffer.setByteOutputChannel(this);
committed = false;
finished = false;
}
// -------------------------------------------------------------- Variables
/**
* The string manager for this package.
*/
protected static StringManager sm =
StringManager.getManager(Constants.Package);
/**
* Logger.
*/
private static final org.apache.juli.logging.Log log
= org.apache.juli.logging.LogFactory.getLog(InternalOutputBuffer.class);
// ----------------------------------------------------- Instance Variables
/**
* Associated Coyote response.
*/
protected Response response;
/**
* Headers of the associated request.
*/
protected MimeHeaders headers;
/**
* Committed flag.
*/
protected boolean committed;
/**
* Finished flag.
*/
protected boolean finished;
/**
* The buffer used for header composition.
*/
protected byte[] buf;
/**
* Position in the buffer.
*/
protected int pos;
/**
* Underlying output stream.
*/
protected OutputStream outputStream;
/**
* Underlying output buffer.
*/
protected OutputBuffer outputStreamOutputBuffer;
/**
* Filter library.
* Note: Filter[0] is always the "chunked" filter.
*/
protected OutputFilter[] filterLibrary;
/**
* Active filter (which is actually the top of the pipeline).
*/
protected OutputFilter[] activeFilters;
/**
* Index of the last active filter.
*/
protected int lastActiveFilter;
/**
* Socket buffer.
*/
protected ByteChunk socketBuffer;
/**
* Socket buffer (extra buffering to reduce number of packets sent).
*/
protected boolean useSocketBuffer = false;
// ------------------------------------------------------------- Properties
/**
* Set the underlying socket output stream.
*/
public void setOutputStream(OutputStream outputStream) {
// FIXME: Check for null ?
this.outputStream = outputStream;
}
/**
* Get the underlying socket output stream.
*/
public OutputStream getOutputStream() {
return outputStream;
}
/**
* Set the socket buffer size.
*/
public void setSocketBuffer(int socketBufferSize) {
if (socketBufferSize > 500) {
useSocketBuffer = true;
socketBuffer.allocate(socketBufferSize, socketBufferSize);
} else {
useSocketBuffer = false;
}
}
/**
* Add an output filter to the filter library.
*/
public void addFilter(OutputFilter filter) {
OutputFilter[] newFilterLibrary =
new OutputFilter[filterLibrary.length + 1];
for (int i = 0; i < filterLibrary.length; i++) {
newFilterLibrary[i] = filterLibrary[i];
}
newFilterLibrary[filterLibrary.length] = filter;
filterLibrary = newFilterLibrary;
activeFilters = new OutputFilter[filterLibrary.length];
}
/**
* Get filters.
*/
public OutputFilter[] getFilters() {
return filterLibrary;
}
/**
* Clear filters.
*/
public void clearFilters() {
filterLibrary = new OutputFilter[0];
lastActiveFilter = -1;
}
/**
* Add an output filter to the filter library.
*/
public void addActiveFilter(OutputFilter filter) {
if (lastActiveFilter == -1) {
filter.setBuffer(outputStreamOutputBuffer);
} else {
for (int i = 0; i <= lastActiveFilter; i++) {
if (activeFilters[i] == filter)
return;
}
filter.setBuffer(activeFilters[lastActiveFilter]);
}
activeFilters[++lastActiveFilter] = filter;
filter.setResponse(response);
}
// --------------------------------------------------------- Public Methods
/**
* Flush the response.
*
* @throws IOException an undelying I/O error occured
*/
public void flush()
throws IOException {
if (!committed) {
// Send the connector a request for commit. The connector should
// then validate the headers, send them (using sendHeader) and
// set the filters accordingly.
response.action(ActionCode.ACTION_COMMIT, null);
}
// go through the filters and if there is gzip filter
// invoke it to flush
for (int i = 0; i <= lastActiveFilter; i++) {
if (activeFilters[i] instanceof GzipOutputFilter) {
if (log.isDebugEnabled()) {
log.debug("Flushing the gzip filter at position " + i +
" of the filter chain...");
}
((GzipOutputFilter) activeFilters[i]).flush();
break;
}
}
// Flush the current buffer
if (useSocketBuffer) {
socketBuffer.flushBuffer();
}
}
/**
* Reset current response.
*
* @throws IllegalStateException if the response has already been committed
*/
public void reset() {
if (committed)
throw new IllegalStateException(/*FIXME:Put an error message*/);
// Recycle Request object
response.recycle();
}
/**
* Recycle the output buffer. This should be called when closing the
* connection.
*/
public void recycle() {
// Recycle Request object
response.recycle();
socketBuffer.recycle();
outputStream = null;
pos = 0;
lastActiveFilter = -1;
committed = false;
finished = false;
}
/**
* End processing of current HTTP request.
* Note: All bytes of the current request should have been already
* consumed. This method only resets all the pointers so that we are ready
* to parse the next HTTP request.
*/
public void nextRequest() {
// Recycle Request object
response.recycle();
socketBuffer.recycle();
// Recycle filters
for (int i = 0; i <= lastActiveFilter; i++) {
activeFilters[i].recycle();
}
// Reset pointers
pos = 0;
lastActiveFilter = -1;
committed = false;
finished = false;
}
/**
* End request.
*
* @throws IOException an undelying I/O error occured
*/
public void endRequest()
throws IOException {
if (!committed) {
// Send the connector a request for commit. The connector should
// then validate the headers, send them (using sendHeader) and
// set the filters accordingly.
response.action(ActionCode.ACTION_COMMIT, null);
}
if (finished)
return;
if (lastActiveFilter != -1)
activeFilters[lastActiveFilter].end();
if (useSocketBuffer) {
socketBuffer.flushBuffer();
}
finished = true;
}
// ------------------------------------------------ HTTP/1.1 Output Methods
/**
* Send an acknoledgement.
*/
public void sendAck()
throws IOException {
if (!committed)
outputStream.write(Constants.ACK_BYTES);
}
/**
* Send the response status line.
*/
public void sendStatus() {
// Write protocol name
write(Constants.HTTP_11_BYTES);
buf[pos++] = Constants.SP;
// Write status code
int status = response.getStatus();
switch (status) {
case 200:
write(Constants._200_BYTES);
break;
case 400:
write(Constants._400_BYTES);
break;
case 404:
write(Constants._404_BYTES);
break;
default:
write(status);
}
buf[pos++] = Constants.SP;
// Write message
String message = null;
if (org.apache.coyote.Constants.USE_CUSTOM_STATUS_MSG_IN_HEADER &&
HttpMessages.isSafeInHttpHeader(response.getMessage())) {
message = response.getMessage();
}
if (message == null) {
write(HttpMessages.getMessage(status));
} else {
write(message);
}
// End the response status line
if (org.apache.coyote.Constants.IS_SECURITY_ENABLED){
AccessController.doPrivileged(
new PrivilegedAction(){
public Object run(){
buf[pos++] = Constants.CR;
buf[pos++] = Constants.LF;
return null;
}
}
);
} else {
buf[pos++] = Constants.CR;
buf[pos++] = Constants.LF;
}
}
private String getMessage(final int message){
if (org.apache.coyote.Constants.IS_SECURITY_ENABLED){
return (String)AccessController.doPrivileged(
new PrivilegedAction(){
public Object run(){
return HttpMessages.getMessage(message);
}
}
);
} else {
return HttpMessages.getMessage(message);
}
}
/**
* Send a header.
*
* @param name Header name
* @param value Header value
*/
public void sendHeader(MessageBytes name, MessageBytes value) {
write(name);
buf[pos++] = Constants.COLON;
buf[pos++] = Constants.SP;
write(value);
buf[pos++] = Constants.CR;
buf[pos++] = Constants.LF;
}
/**
* Send a header.
*
* @param name Header name
* @param value Header value
*/
public void sendHeader(ByteChunk name, ByteChunk value) {
write(name);
buf[pos++] = Constants.COLON;
buf[pos++] = Constants.SP;
write(value);
buf[pos++] = Constants.CR;
buf[pos++] = Constants.LF;
}
/**
* Send a header.
*
* @param name Header name
* @param value Header value
*/
public void sendHeader(String name, String value) {
write(name);
buf[pos++] = Constants.COLON;
buf[pos++] = Constants.SP;
write(value);
buf[pos++] = Constants.CR;
buf[pos++] = Constants.LF;
}
/**
* End the header block.
*/
public void endHeaders() {
buf[pos++] = Constants.CR;
buf[pos++] = Constants.LF;
}
// --------------------------------------------------- OutputBuffer Methods
/**
* Write the contents of a byte chunk.
*
* @param chunk byte chunk
* @return number of bytes written
* @throws IOException an undelying I/O error occured
*/
public int doWrite(ByteChunk chunk, Response res)
throws IOException {
if (!committed) {
// Send the connector a request for commit. The connector should
// then validate the headers, send them (using sendHeaders) and
// set the filters accordingly.
response.action(ActionCode.ACTION_COMMIT, null);
}
if (lastActiveFilter == -1)
return outputStreamOutputBuffer.doWrite(chunk, res);
else
return activeFilters[lastActiveFilter].doWrite(chunk, res);
}
// ------------------------------------------------------ Protected Methods
/**
* Commit the response.
*
* @throws IOException an undelying I/O error occured
*/
protected void commit()
throws IOException {
// The response is now committed
committed = true;
response.setCommitted(true);
if (pos > 0) {
// Sending the response header buffer
if (useSocketBuffer) {
socketBuffer.append(buf, 0, pos);
} else {
outputStream.write(buf, 0, pos);
}
}
}
/**
* This method will write the contents of the specyfied message bytes
* buffer to the output stream, without filtering. This method is meant to
* be used to write the response header.
*
* @param mb data to be written
*/
protected void write(MessageBytes mb) {
if (mb.getType() == MessageBytes.T_BYTES) {
ByteChunk bc = mb.getByteChunk();
write(bc);
} else if (mb.getType() == MessageBytes.T_CHARS) {
CharChunk cc = mb.getCharChunk();
write(cc);
} else {
write(mb.toString());
}
}
/**
* This method will write the contents of the specyfied message bytes
* buffer to the output stream, without filtering. This method is meant to
* be used to write the response header.
*
* @param bc data to be written
*/
protected void write(ByteChunk bc) {
// Writing the byte chunk to the output buffer
int length = bc.getLength();
System.arraycopy(bc.getBytes(), bc.getStart(), buf, pos, length);
pos = pos + length;
}
/**
* This method will write the contents of the specyfied char
* buffer to the output stream, without filtering. This method is meant to
* be used to write the response header.
*
* @param cc data to be written
*/
protected void write(CharChunk cc) {
int start = cc.getStart();
int end = cc.getEnd();
char[] cbuf = cc.getBuffer();
for (int i = start; i < end; i++) {
char c = cbuf[i];
// Note: This is clearly incorrect for many strings,
// but is the only consistent approach within the current
// servlet framework. It must suffice until servlet output
// streams properly encode their output.
if (((c <= 31) && (c != 9)) || c == 127 || c > 255) {
c = ' ';
}
buf[pos++] = (byte) c;
}
}
/**
* This method will write the contents of the specyfied byte
* buffer to the output stream, without filtering. This method is meant to
* be used to write the response header.
*
* @param b data to be written
*/
public void write(byte[] b) {
// Writing the byte chunk to the output buffer
System.arraycopy(b, 0, buf, pos, b.length);
pos = pos + b.length;
}
/**
* This method will write the contents of the specyfied String to the
* output stream, without filtering. This method is meant to be used to
* write the response header.
*
* @param s data to be written
*/
protected void write(String s) {
if (s == null)
return;
// From the Tomcat 3.3 HTTP/1.0 connector
int len = s.length();
for (int i = 0; i < len; i++) {
char c = s.charAt (i);
// Note: This is clearly incorrect for many strings,
// but is the only consistent approach within the current
// servlet framework. It must suffice until servlet output
// streams properly encode their output.
if (((c <= 31) && (c != 9)) || c == 127 || c > 255) {
c = ' ';
}
buf[pos++] = (byte) c;
}
}
/**
* This method will print the specified integer to the output stream,
* without filtering. This method is meant to be used to write the
* response header.
*
* @param i data to be written
*/
protected void write(int i) {
write(String.valueOf(i));
}
/**
* Callback to write data from the buffer.
*/
public void realWriteBytes(byte cbuf[], int off, int len)
throws IOException {
if (len > 0) {
outputStream.write(cbuf, off, len);
}
}
// ----------------------------------- OutputStreamOutputBuffer Inner Class
/**
* This class is an output buffer which will write data to an output
* stream.
*/
protected class OutputStreamOutputBuffer
implements OutputBuffer {
/**
* Write chunk.
*/
public int doWrite(ByteChunk chunk, Response res)
throws IOException {
int length = chunk.getLength();
if (useSocketBuffer) {
socketBuffer.append(chunk.getBuffer(), chunk.getStart(),
length);
} else {
outputStream.write(chunk.getBuffer(), chunk.getStart(),
length);
}
return length;
}
}
}