org.glassfish.grizzly.portunif.finders.HttpProtocolFinder Maven / Gradle / Ivy
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package org.glassfish.grizzly.portunif.finders;
import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.attributes.Attribute;
import org.glassfish.grizzly.filterchain.FilterChainContext;
import org.glassfish.grizzly.portunif.PUContext;
import org.glassfish.grizzly.portunif.ProtocolFinder;
/**
* A {@link ProtocolFinder} implementation that parse the available
* SocketChannel bytes looking for the 'http' bytes. An http request will
* always has the form of:
*
* METHOD URI PROTOCOL/VERSION
*
* example: GET / HTTP/1.1
*
* The algorithm will try to find the protocol token.
*
* @author Jeanfrancois Arcand
* @author Alexey Stashok
*/
public class HttpProtocolFinder implements ProtocolFinder {
private static final char[] METHOD_FIRST_LETTERS = new char[] {'G', 'P', 'O', 'H', 'D', 'T', 'C'};
private final Attribute parsingStateAttribute =
Grizzly.DEFAULT_ATTRIBUTE_BUILDER.createAttribute(
HttpProtocolFinder.class + "-" + hashCode()
+ ".parsingStateAttribute");
private final int maxRequestLineSize;
public HttpProtocolFinder() {
this(2048);
}
public HttpProtocolFinder(int maxRequestLineSize) {
this.maxRequestLineSize = maxRequestLineSize;
}
@Override
public Result find(final PUContext puContext, final FilterChainContext ctx) {
final Connection connection = ctx.getConnection();
final Buffer buffer = ctx.getMessage();
final ParsingState parsingState = parsingStateAttribute.get(connection);
final int limit = buffer.limit();
int position;
int state;
if (parsingState == null) {
position = buffer.position();
state = 0;
} else {
position = parsingState.position;
state = parsingState.state;
}
byte c = 0;
byte c2;
// Rule b - try to determine the context-root
while (position < limit) {
c2 = c;
c = buffer.get(position++);
// State Machine
// 0 - Search for the first SPACE ' ' between the method and the
// the request URI
// 1 - Search for the second SPACE ' ' between the request URI
// and the method
_1:
switch (state) {
case 0:
// Check method name
for (int i = 0; i < METHOD_FIRST_LETTERS.length; i++) {
if (c == METHOD_FIRST_LETTERS[i]) {
state = 1;
break _1;
}
}
return Result.NOT_FOUND;
case 1:
// Search for first ' '
if (c == 0x20) {
state = 2;
}
break;
case 2:
// Search for next ' '
if (c == 0x20) {
state = 3;
}
break;
case 3:
// Check 'H' part of HTTP/
if (c == 'H') {
state = 4;
break;
}
return Result.NOT_FOUND;
case 4:
// Search for P/ (part of HTTP/)
if (c == 0x2f && c2 == 'P') {
// find SSL preprocessor
if (parsingState != null) {
parsingStateAttribute.remove(connection);
}
return Result.FOUND;
}
break;
default:
return Result.NOT_FOUND;
}
}
if (position >= maxRequestLineSize) {
return Result.NOT_FOUND;
}
if (parsingState == null) {
parsingStateAttribute.set(connection, new ParsingState(position, state));
} else {
parsingState.position = position;
parsingState.state = state;
}
return Result.NEED_MORE_DATA;
}
private static final class ParsingState {
int position;
int state;
public ParsingState(int position, int state) {
this.position = position;
this.state = state;
}
}
}