nl.topicus.jdbc.shaded.org.apache.http.impl.io.AbstractMessageParser Maven / Gradle / Ivy
/*
* $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0.1/httpcore/src/main/java/nl.topicus.jdbc.shaded.org.apache.http/impl/io/AbstractMessageParser.java $
* $Revision: 744526 $
* $Date: 2009-02-14 18:04:18 +0100 (Sat, 14 Feb 2009) $
*
* ====================================================================
* 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
*
* The following HTTP parameters affect the initialization:
*
* {@link CoreConnectionPNames#MAX_HEADER_COUNT} parameter determines
* the maximum HTTP header count allowed. If set to a positive value,
* the number of HTTP headers received from the data stream exceeding
* this limit will cause an IOException. A negative or zero value will
* effectively disable the check. Per default the check is disabled.
*
* {@link CoreConnectionPNames#MAX_LINE_LENGTH} parameter determines
* the maximum line length limit. If set to a positive value, any HTTP line
* exceeding this limit will cause an IOException. A negative or zero value
* will effectively disable the check the check. Per default the check is
* disabled.
*
* @param buffer the session input buffer.
* @param parser the line parser.
* @param params HTTP parameters.
*/
public AbstractMessageParser(
final SessionInputBuffer buffer,
final LineParser parser,
final HttpParams params) {
super();
if (buffer == null) {
throw new IllegalArgumentException("Session input buffer may not be null");
}
if (params == null) {
throw new IllegalArgumentException("HTTP parameters may not be null");
}
this.sessionBuffer = buffer;
this.maxHeaderCount = params.getIntParameter(
CoreConnectionPNames.MAX_HEADER_COUNT, -1);
this.maxLineLen = params.getIntParameter(
CoreConnectionPNames.MAX_LINE_LENGTH, -1);
this.lineParser = (parser != null) ? parser : BasicLineParser.DEFAULT;
}
/**
* Parses HTTP headers from the data receiver stream according to the generic
* format as given in Section 3.1 of RFC 822, RFC-2616 Section 4 and 19.3.
*
* @param inbuffer Session input buffer
* @param maxHeaderCount maximum number of headers allowed. If the number
* of headers received from the data stream exceeds maxCount value, an
* IOException will be thrown. Setting this parameter to a negative value
* or zero will disable the check.
* @param maxLineLen maximum number of characters for a header line,
* including the continuation lines. Setting this parameter to a negative
* value or zero will disable the check.
* @return array of HTTP headers
*
* @throws IOException in case of an I/O error
* @throws HttpException in case of HTTP protocol violation
*/
public static Header[] parseHeaders(
final SessionInputBuffer inbuffer,
int maxHeaderCount,
int maxLineLen,
LineParser parser)
throws HttpException, IOException {
if (inbuffer == null) {
throw new IllegalArgumentException("Session input buffer may not be null");
}
if (parser == null)
parser = BasicLineParser.DEFAULT;
ArrayList headerLines = new ArrayList();
CharArrayBuffer current = null;
CharArrayBuffer previous = null;
for (;;) {
if (current == null) {
current = new CharArrayBuffer(64);
} else {
current.clear();
}
int l = inbuffer.readLine(current);
if (l == -1 || current.length() < 1) {
break;
}
// Parse the header name and value
// Check for folded headers first
// Detect LWS-char see HTTP/1.0 or HTTP/1.1 Section 2.2
// discussion on folded headers
if ((current.charAt(0) == ' ' || current.charAt(0) == '\t') && previous != null) {
// we have continuation folded header
// so append value
int i = 0;
while (i < current.length()) {
char ch = current.charAt(i);
if (ch != ' ' && ch != '\t') {
break;
}
i++;
}
if (maxLineLen > 0
&& previous.length() + 1 + current.length() - i > maxLineLen) {
throw new IOException("Maximum line length limit exceeded");
}
previous.append(' ');
previous.append(current, i, current.length() - i);
} else {
headerLines.add(current);
previous = current;
current = null;
}
if (maxHeaderCount > 0 && headerLines.size() >= maxHeaderCount) {
throw new IOException("Maximum header count exceeded");
}
}
Header[] headers = new Header[headerLines.size()];
for (int i = 0; i < headerLines.size(); i++) {
CharArrayBuffer buffer = (CharArrayBuffer) headerLines.get(i);
try {
headers[i] = parser.parseHeader(buffer);
} catch (ParseException ex) {
throw new ProtocolException(ex.getMessage());
}
}
return headers;
}
/**
* Subclasses must override this method to generate an instance of
* {@link HttpMessage} based on the initial input from the session buffer.
*
* Usually this method is expected to read just the very first line or
* the very first valid from the data stream and based on the input generate
* an appropriate instance of {@link HttpMessage}.
*
* @param sessionBuffer the session input buffer.
* @return HTTP message based on the input from the session buffer.
* @throws IOException in case of an I/O error.
* @throws HttpException in case of HTTP protocol violation.
* @throws ParseException in case of a parse error.
*/
protected abstract HttpMessage parseHead(SessionInputBuffer sessionBuffer)
throws IOException, HttpException, ParseException;
public HttpMessage parse() throws IOException, HttpException {
HttpMessage message = null;
try {
message = parseHead(this.sessionBuffer);
} catch (ParseException px) {
throw new ProtocolException(px.getMessage(), px);
}
Header[] headers = AbstractMessageParser.parseHeaders(
this.sessionBuffer,
this.maxHeaderCount,
this.maxLineLen,
this.lineParser);
message.setHeaders(headers);
return message;
}
}