/*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.impl.conn;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpException;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseFactory;
import org.apache.http.NoHttpResponseException;
import org.apache.http.ProtocolException;
import org.apache.http.StatusLine;
import org.apache.http.annotation.NotThreadSafe;
import org.apache.http.config.MessageConstraints;
import org.apache.http.impl.DefaultHttpResponseFactory;
import org.apache.http.impl.io.AbstractMessageParser;
import org.apache.http.io.SessionInputBuffer;
import org.apache.http.message.LineParser;
import org.apache.http.message.ParserCursor;
import org.apache.http.params.HttpParams;
import org.apache.http.util.Args;
import org.apache.http.util.CharArrayBuffer;
/**
* Lenient HTTP response parser implementation that can skip malformed data until
* a valid HTTP response message head is encountered.
*
* @since 4.2
*/
@SuppressWarnings("deprecation")
@NotThreadSafe
public class DefaultHttpResponseParser extends AbstractMessageParser<HttpResponse> {
private final Log log = LogFactory.getLog(getClass());
private final HttpResponseFactory responseFactory;
private final CharArrayBuffer lineBuf;
/**
* @deprecated (4.3) use {@link DefaultHttpResponseParser#DefaultHttpResponseParser(
* SessionInputBuffer, LineParser, HttpResponseFactory, MessageConstraints)}
*/
@Deprecated
public DefaultHttpResponseParser(
final SessionInputBuffer buffer,
final LineParser parser,
final HttpResponseFactory responseFactory,
final HttpParams params) {
super(buffer, parser, params);
Args.notNull(responseFactory, "Response factory");
this.responseFactory = responseFactory;
this.lineBuf = new CharArrayBuffer(128);
}
/**
* Creates new instance of DefaultHttpResponseParser.
*
* @param buffer the session input buffer.
* @param lineParser the line parser. If {@code null}
* {@link org.apache.http.message.BasicLineParser#INSTANCE} will be used.
* @param responseFactory HTTP response factory. If {@code null}
* {@link DefaultHttpResponseFactory#INSTANCE} will be used.
* @param constraints the message constraints. If {@code null}
* {@link MessageConstraints#DEFAULT} will be used.
*
* @since 4.3
*/
public DefaultHttpResponseParser(
final SessionInputBuffer buffer,
final LineParser lineParser,
final HttpResponseFactory responseFactory,
final MessageConstraints constraints) {
super(buffer, lineParser, constraints);
this.responseFactory = responseFactory != null ? responseFactory :
DefaultHttpResponseFactory.INSTANCE;
this.lineBuf = new CharArrayBuffer(128);
}
/**
* Creates new instance of DefaultHttpResponseParser.
*
* @param buffer the session input buffer.
* @param constraints the message constraints. If {@code null}
* {@link MessageConstraints#DEFAULT} will be used.
*
* @since 4.3
*/
public DefaultHttpResponseParser(
final SessionInputBuffer buffer, final MessageConstraints constraints) {
this(buffer, null, null, constraints);
}
/**
* Creates new instance of DefaultHttpResponseParser.
*
* @param buffer the session input buffer.
*
* @since 4.3
*/
public DefaultHttpResponseParser(final SessionInputBuffer buffer) {
this(buffer, null, null, MessageConstraints.DEFAULT);
}
@Override
protected HttpResponse parseHead(
final SessionInputBuffer sessionBuffer) throws IOException, HttpException {
//read out the HTTP status string
int count = 0;
ParserCursor cursor = null;
do {
// clear the buffer
this.lineBuf.clear();
final int i = sessionBuffer.readLine(this.lineBuf);
if (i == -1 && count == 0) {
// The server just dropped connection on us
throw new NoHttpResponseException("The target server failed to respond");
}
cursor = new ParserCursor(0, this.lineBuf.length());
if (lineParser.hasProtocolVersion(this.lineBuf, cursor)) {
// Got one
break;
} else if (i == -1 || reject(this.lineBuf, count)) {
// Giving up
throw new ProtocolException("The server failed to respond with a " +
"valid HTTP response");
}
if (this.log.isDebugEnabled()) {
this.log.debug("Garbage in response: " + this.lineBuf.toString());
}
count++;
} while(true);
//create the status line from the status string
final StatusLine statusline = lineParser.parseStatusLine(this.lineBuf, cursor);
return this.responseFactory.newHttpResponse(statusline, null);
}
protected boolean reject(final CharArrayBuffer line, final int count) {
return false;
}
}