org.zaproxy.zap.network.ZapHttpParser Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of zap Show documentation

The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications. It is designed to be used by people with a wide range of security experience and as such is ideal for developers and functional testers who are new to penetration testing. ZAP provides automated scanners as well as a set of tools that allow you to find security vulnerabilities manually.

There is a newer version: 2.15.0

Show newest version

/*
 * Zed Attack Proxy (ZAP) and its related class files.
 *
 * ZAP is an HTTP/HTTPS proxy for assessing web application security.
 *
 * Copyright 2013 The ZAP Development Team
 *
 * Licensed 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.zaproxy.zap.network;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpParser;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * A utility class to parse HTTP response headers.
 *
 * Used to override the {@code HttpClient} behaviour to accept HTTP responses which contain
 * malformed HTTP header lines. Note: Malformed HTTP header lines are ignored
 * (instead of throwing an exception).
 */
public class ZapHttpParser {

    private static final Logger logger = LogManager.getLogger(ZapHttpParser.class);

    private ZapHttpParser() {}

    /*
     * Implementation copied from HttpParser#parseHeaders(InputStream, String) except that no exception is thrown in case of
     * malformed HTTP header lines.
     */
    @SuppressWarnings({"rawtypes", "unchecked", "null"})
    public static Header[] parseHeaders(InputStream is, String charset)
            throws IOException, HttpException {
        ArrayList headers = new ArrayList();
        String name = null;
        StringBuffer value = null;
        for (; ; ) {
            String line = HttpParser.readLine(is, charset);
            if ((line == null) || (line.trim().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 ((line.charAt(0) == ' ') || (line.charAt(0) == '\t')) {
                // we have continuation folded header
                // so append value
                if (value != null) {
                    value.append(' ');
                    value.append(line.trim());
                }
            } else {
                // make sure we save the previous name,value pair if present
                if (name != null) {
                    headers.add(new Header(name, value.toString()));
                }

                // Otherwise we should have normal HTTP header line
                // Parse the header name and value
                int colon = line.indexOf(":");
                if (colon < 0) {
                    // Do not thrown the exception ignore it instead
                    // throw new ProtocolException("Unable to parse header: " + line);
                    logger.warn("Ignoring malformed HTTP header line: \"" + line + "\"");
                    name = null;
                    value = null;
                } else {
                    name = line.substring(0, colon).trim();
                    value = new StringBuffer(line.substring(colon + 1).trim());
                }
            }
        }

        // make sure we save the last name,value pair if present
        if (name != null) {
            headers.add(new Header(name, value.toString()));
        }

        return (Header[]) headers.toArray(new Header[headers.size()]);
    }
}