/*
 *  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.ajp;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.junit.Assert;
import org.junit.Test;

import org.apache.catalina.Context;
import org.apache.catalina.startup.Tomcat;
import org.apache.catalina.startup.TomcatBaseTest;

public class TestAbstractAjpProcessor extends TomcatBaseTest {

    @Override
    protected String getProtocol() {
        /*
         * The tests are all setup for HTTP so need to convert the protocol
         * values to AJP.
         */
        // Has a protocol been specified
        String protocol = System.getProperty("tomcat.test.protocol");

        // Use BIO by default
        if (protocol == null) {
            protocol = "org.apache.coyote.ajp.AjpProtocol";
        } else if (protocol.contains("Nio")) {
            protocol = "org.apache.coyote.ajp.AjpNioProtocol";
        } else if (protocol.contains("Apr")) {
            protocol = "org.apache.coyote.ajp.AjpAprProtocol";
        } else {
            protocol = "org.apache.coyote.ajp.AjpProtocol";
        }

        return protocol;
    }

    private void doSnoopTest(RequestDescriptor desc) throws Exception {

        Map<String, String> requestInfo = desc.getRequestInfo();
        Map<String, String> contextInitParameters = desc.getContextInitParameters();
        Map<String, String> contextAttributes = desc.getContextAttributes();
        Map<String, String> headers = desc.getHeaders();
        Map<String, String> attributes = desc.getAttributes();
        Map<String, String> params = desc.getParams();

        Tomcat tomcat = getTomcatInstance();

        // Must have a real docBase - just use temp
        Context ctx = tomcat.addContext("", System.getProperty("java.io.tmpdir"));

        Tomcat.addServlet(ctx, "snoop", new SnoopServlet());
        ctx.addServletMapping("/", "snoop");

        SimpleAjpClient ajpClient = new SimpleAjpClient();

        if (requestInfo.get("REQUEST-QUERY-STRING") != null &&
            params.size() > 0) {
            throw(new IllegalArgumentException("Request setting " +
                "'REQUEST-QUERY-STRING' and explicit params not allowed " +
                "together"));
        }

        String value;
        Map<String, String> savedRequestInfo = new HashMap<String, String>();
        for (String name: requestInfo.keySet()) {
            value = requestInfo.get(name);
            if (name.equals("REQUEST-METHOD")) {
                ajpClient.setMethod(value);
            } else if (name.equals("REQUEST-PROTOCOL")) {
                ajpClient.setProtocol(value);
            } else if (name.equals("REQUEST-URI")) {
                ajpClient.setUri(value);
            } else if (name.equals("REQUEST-REMOTE-HOST")) {
                /* request.getRemoteHost() will default to
                 * request.getRemoteAddr() unless enableLookups is set. */
                tomcat.getConnector().setEnableLookups(true);
                ajpClient.setRemoteHost(value);
            } else if (name.equals("REQUEST-REMOTE-ADDR")) {
                ajpClient.setRemoteAddr(value);
            } else if (name.equals("REQUEST-SERVER-NAME")) {
                ajpClient.setServerName(value);
            } else if (name.equals("REQUEST-SERVER-PORT")) {
                ajpClient.setServerPort(Integer.valueOf(value));
            } else if (name.equals("REQUEST-IS-SECURE")) {
                ajpClient.setSsl(Boolean.parseBoolean(value));
            } else if (name.equals("REQUEST-LOCAL-ADDR")) {
                savedRequestInfo.put(name, value);
            } else if (name.equals("REQUEST-REMOTE-PORT")) {
                savedRequestInfo.put(name, value);
            } else if (name.equals("REQUEST-REMOTE-USER") ||
                       name.equals("REQUEST-ROUTE") ||
                       name.equals("REQUEST-SECRET") ||
                       name.equals("REQUEST-AUTH-TYPE") ||
                       name.equals("REQUEST-QUERY-STRING")) {
                savedRequestInfo.put(name, value);
            } else if (name.equals("REQUEST-CONTENT-LENGTH")) {
                headers.put("CONTENT-LENGTH", value);
            } else if (name.equals("REQUEST-CONTENT-TYPE")) {
                headers.put("CONTENT-TYPE", value);
            /* Not yet implemented or not (easily) possible to implement
             * "REQUEST-LOCAL-NAME"
             * "REQUEST-LOCAL-PORT"
             * "REQUEST-SCHEME"
             * "REQUEST-URL"
             * "REQUEST-CONTEXT-PATH"
             * "REQUEST-SERVLET-PATH"
             * "REQUEST-PATH-INFO"
             * "REQUEST-PATH-TRANSLATED"
             * "REQUEST-USER-PRINCIPAL"
             * "REQUEST-CHARACTER-ENCODING"
             * "REQUEST-LOCALE"
             * "SESSION-REQUESTED-ID"
             * "SESSION-REQUESTED-ID-COOKIE"
             * "SESSION-REQUESTED-ID-URL"
             * "SESSION-REQUESTED-ID-VALID"
             */
            } else {
                throw(new IllegalArgumentException("Request setting '" + name + "' not supported"));
            }
        }

        ServletContext sc = ctx.getServletContext();
        for (String name: contextInitParameters.keySet()) {
            sc.setInitParameter(name, contextInitParameters.get(name));
        }
        for (String name: contextAttributes.keySet()) {
            sc.setAttribute(name, contextAttributes.get(name));
        }

        /* Basic request properties must be set before this call */
        TesterAjpMessage forwardMessage = ajpClient.createForwardMessage();

        for (String name: savedRequestInfo.keySet()) {
            value = savedRequestInfo.get(name);
            if (name.equals("REQUEST-LOCAL-ADDR")) {
                forwardMessage.addAttribute("AJP_LOCAL_ADDR", value);
            } else if (name.equals("REQUEST-REMOTE-PORT")) {
                forwardMessage.addAttribute("AJP_REMOTE_PORT", value);
            } else if (name.equals("REQUEST-REMOTE-USER")) {
                /* request.getRemoteUser() will not trust the AJP
                 * info if tomcatAuthentication is set. */
                tomcat.getConnector().setProperty("tomcatAuthentication", "false");
                forwardMessage.addAttribute(0x03, value);
            } else if (name.equals("REQUEST-AUTH-TYPE")) {
                /* request.getAuthType() will not trust the AJP
                 * info if tomcatAuthentication is set. */
                tomcat.getConnector().setProperty("tomcatAuthentication", "false");
                forwardMessage.addAttribute(0x04, value);
            } else if (name.equals("REQUEST-QUERY-STRING")) {
                forwardMessage.addAttribute(0x05, value);
            } else if (name.equals("REQUEST-ROUTE")) {
                forwardMessage.addAttribute(0x06, value);
            } else if (name.equals("REQUEST-SECRET")) {
                forwardMessage.addAttribute(0x0C, value);
            } else {
                throw(new IllegalArgumentException("Request setting '" + name + "' not supported"));
            }
        }

        if (params.size() > 0) {
            StringBuilder query = new StringBuilder();
            boolean sep = false;
            for (String name: params.keySet()) {
                if (sep) {
                    query.append("&");
                } else {
                    sep = true;
                }
                query.append(name);
                query.append("=");
                query.append(params.get(name));
            }
            forwardMessage.addAttribute(0x05, query.toString());
        }

        for (String name: headers.keySet()) {
            value = headers.get(name);
            name = name.toUpperCase();
            if (name.equals("ACCEPT")) {
                forwardMessage.addHeader(0xA001, value);
            } else if (name.equals("ACCEPT-CHARSET")) {
                forwardMessage.addHeader(0xA002, value);
            } else if (name.equals("ACCEPT-ENCODING")) {
                forwardMessage.addHeader(0xA003, value);
            } else if (name.equals("ACCEPT-LANGUAGE")) {
                forwardMessage.addHeader(0xA004, value);
            } else if (name.equals("AUTHORIZATION")) {
                forwardMessage.addHeader(0xA005, value);
            } else if (name.equals("CONNECTION")) {
                forwardMessage.addHeader(0xA006, value);
            } else if (name.equals("CONTENT-TYPE")) {
                forwardMessage.addHeader(0xA007, value);
            } else if (name.equals("CONTENT-LENGTH")) {
                forwardMessage.addHeader(0xA008, value);
            } else if (name.equals("COOKIE")) {
                forwardMessage.addHeader(0xA009, value);
            } else if (name.equals("COOKIE2")) {
                forwardMessage.addHeader(0xA00A, value);
            } else if (name.equals("HOST")) {
                forwardMessage.addHeader(0xA00B, value);
            } else if (name.equals("PRAGMA")) {
                forwardMessage.addHeader(0xA00C, value);
            } else if (name.equals("REFERER")) {
                forwardMessage.addHeader(0xA00D, value);
            } else if (name.equals("USER-AGENT")) {
                forwardMessage.addHeader(0xA00E, value);
            } else {
                forwardMessage.addHeader(name, value);
            }
        }
        for (String name: attributes.keySet()) {
            value = attributes.get(name);
            forwardMessage.addAttribute(name, value);
        }
        // Complete the message
        forwardMessage.end();

        tomcat.start();
        ajpClient.setPort(getPort());
        ajpClient.connect();

        // Expect 3 packets: headers, body, end
        TesterAjpMessage responseHeaders = ajpClient.sendMessage(forwardMessage);
        validateResponseHeaders(responseHeaders, 200, "OK");

        String body = extractResponseBody(ajpClient.readMessage());
        RequestDescriptor result = SnoopResult.parse(body);

        /* AJP attributes result in Coyote Request attributes, which are
         * not listed by request.getAttributeNames(), so SnoopServlet
         * does not see them. Delete attributes before result comparison. */
        desc.getAttributes().clear();

        result.compare(desc);

        validateResponseEnd(ajpClient.readMessage(), true);
    }

    @Test
    public void testServerName() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-SERVER-NAME", "MYSERVER");
        desc.putRequestInfo("REQUEST-URI", "/testServerName");
        doSnoopTest(desc);
    }

    @Test
    public void testServerPort() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-SERVER-PORT", "8888");
        desc.putRequestInfo("REQUEST-URI", "/testServerPort");
        doSnoopTest(desc);
    }

    @Test
    public void testLocalAddr() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-LOCAL-ADDR", "10.3.2.1");
        desc.putRequestInfo("REQUEST-URI", "/testLocalAddr");
        doSnoopTest(desc);
    }

    @Test
    public void testRemoteHost() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-REMOTE-HOST", "MYCLIENT");
        desc.putRequestInfo("REQUEST-URI", "/testRemoteHost");
        doSnoopTest(desc);
    }

    @Test
    public void testRemoteAddr() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-REMOTE-ADDR", "10.1.2.3");
        desc.putRequestInfo("REQUEST-URI", "/testRemoteAddr");
        doSnoopTest(desc);
    }

    @Test
    public void testRemotePort() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-REMOTE-PORT", "34567");
        desc.putRequestInfo("REQUEST-URI", "/testRemotePort");
        doSnoopTest(desc);
    }

    @Test
    public void testMethod() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-METHOD", "LOCK");
        desc.putRequestInfo("REQUEST-URI", "/testMethod");
        doSnoopTest(desc);
    }

    @Test
    public void testUri() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-URI", "/a/b/c");
        doSnoopTest(desc);
    }

    @Test
    public void testProtocol() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-PROTOCOL", "HTTP/1.x");
        desc.putRequestInfo("REQUEST-URI", "/testProtocol");
        doSnoopTest(desc);
    }

    @Test
    public void testSecure() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-IS-SECURE", "true");
        desc.putRequestInfo("REQUEST-URI", "/testSecure");
        doSnoopTest(desc);
    }

    @Test
    public void testQueryString() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-QUERY-STRING", "p1=1&p2=12&p3=123");
        desc.putRequestInfo("REQUEST-URI", "/testQueryString");
        doSnoopTest(desc);
    }

    @Test
    public void testRemoteUser() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-REMOTE-USER", "MYUSER");
        desc.putRequestInfo("REQUEST-URI", "/testRemoteUser");
        doSnoopTest(desc);
    }

    @Test
    public void testAuthType() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-AUTH-TYPE", "MyAuth");
        desc.putRequestInfo("REQUEST-URI", "/testAuthType");
        doSnoopTest(desc);
    }

    @Test
    public void testOneHeader() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putHeader("MYHEADER", "MYHEADER-VALUE");
        desc.putRequestInfo("REQUEST-URI", "/testOneHeader");
        doSnoopTest(desc);
    }

    @Test
    public void testOneAttribute() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putAttribute("MYATTRIBUTE", "MYATTRIBUTE-VALUE");
        desc.putRequestInfo("REQUEST-URI", "/testOneAttribute");
        doSnoopTest(desc);
    }

    @Test
    public void testMulti() throws Exception {
        RequestDescriptor desc = new RequestDescriptor();
        desc.putRequestInfo("REQUEST-SERVER-NAME", "MYSERVER");
        desc.putRequestInfo("REQUEST-SERVER-PORT", "8888");
        desc.putRequestInfo("REQUEST-LOCAL-ADDR", "10.3.2.1");
        desc.putRequestInfo("REQUEST-REMOTE-HOST", "MYCLIENT");
        desc.putRequestInfo("REQUEST-REMOTE-ADDR", "10.1.2.3");
        desc.putRequestInfo("REQUEST-REMOTE-PORT", "34567");
        desc.putRequestInfo("REQUEST-METHOD", "LOCK");
        desc.putRequestInfo("REQUEST-URI", "/a/b/c");
        desc.putRequestInfo("REQUEST-PROTOCOL", "HTTP/1.x");
        desc.putRequestInfo("REQUEST-IS-SECURE", "true");
        desc.putRequestInfo("REQUEST-QUERY-STRING", "p1=1&p2=12&p3=123");
        desc.putRequestInfo("REQUEST-REMOTE-USER", "MYUSER");
        desc.putRequestInfo("REQUEST-AUTH-TYPE", "MyAuth");
        desc.putHeader("MYHEADER1", "MYHEADER1-VALUE");
        desc.putHeader("MYHEADER2", "MYHEADER2-VALUE");
        desc.putAttribute("MYATTRIBUTE1", "MYATTRIBUTE-VALUE1");
        desc.putAttribute("MYATTRIBUTE2", "MYATTRIBUTE-VALUE2");
        doSnoopTest(desc);
    }

    @Test
    public void testSecret() throws Exception {
        Tomcat tomcat = getTomcatInstance();
        tomcat.getConnector().setProperty("requiredSecret", "RIGHTSECRET");
        tomcat.start();

        // Must have a real docBase - just use temp
        Context ctx = tomcat.addContext("", System.getProperty("java.io.tmpdir"));

        Tomcat.addServlet(ctx, "helloWorld", new HelloWorldServlet());
        ctx.addServletMapping("/", "helloWorld");

        SimpleAjpClient ajpClient = new SimpleAjpClient();

        ajpClient.setPort(getPort());

        ajpClient.connect();
        validateCpong(ajpClient.cping());

        TesterAjpMessage forwardMessage = ajpClient.createForwardMessage();
        forwardMessage.end();

        TesterAjpMessage responseHeaders = ajpClient.sendMessage(forwardMessage);
        // Expect 3 packets: headers, body, end
        validateResponseHeaders(responseHeaders, 403, "Forbidden");
        //TesterAjpMessage responseBody = ajpClient.readMessage();
        //validateResponseBody(responseBody, HelloWorldServlet.RESPONSE_TEXT);
        validateResponseEnd(ajpClient.readMessage(), false);

        ajpClient.connect();
        validateCpong(ajpClient.cping());

        forwardMessage = ajpClient.createForwardMessage();
        forwardMessage.addAttribute(0x0C, "WRONGSECRET");
        forwardMessage.end();

        responseHeaders = ajpClient.sendMessage(forwardMessage);
        // Expect 3 packets: headers, body, end
        validateResponseHeaders(responseHeaders, 403, "Forbidden");
        //responseBody = ajpClient.readMessage();
        //validateResponseBody(responseBody, HelloWorldServlet.RESPONSE_TEXT);
        validateResponseEnd(ajpClient.readMessage(), false);

        ajpClient.connect();
        validateCpong(ajpClient.cping());

        forwardMessage = ajpClient.createForwardMessage();
        forwardMessage.addAttribute(0x0C, "RIGHTSECRET");
        forwardMessage.end();

        responseHeaders = ajpClient.sendMessage(forwardMessage);
        // Expect 3 packets: headers, body, end
        validateResponseHeaders(responseHeaders, 200, "OK");
        TesterAjpMessage responseBody = ajpClient.readMessage();
        validateResponseBody(responseBody, HelloWorldServlet.RESPONSE_TEXT);
        validateResponseEnd(ajpClient.readMessage(), true);

        ajpClient.disconnect();
    }

    @Test
    public void testKeepAlive() throws Exception {
        Tomcat tomcat = getTomcatInstance();
        tomcat.getConnector().setProperty("connectionTimeout", "-1");
        tomcat.start();

        // Must have a real docBase - just use temp
        Context ctx = tomcat.addContext("", System.getProperty("java.io.tmpdir"));
        Tomcat.addServlet(ctx, "helloWorld", new HelloWorldServlet());
        ctx.addServletMapping("/", "helloWorld");

        SimpleAjpClient ajpClient = new SimpleAjpClient();

        ajpClient.setPort(getPort());

        ajpClient.connect();

        validateCpong(ajpClient.cping());

        TesterAjpMessage forwardMessage = ajpClient.createForwardMessage();
        forwardMessage.addHeader("X-DUMMY-HEADER", "IGNORE");
        // Complete the message - no extra headers required.
        forwardMessage.end();

        // Two requests
        for (int i = 0; i < 2; i++) {
            TesterAjpMessage responseHeaders = ajpClient.sendMessage(forwardMessage);
            // Expect 3 packets: headers, body, end
            validateResponseHeaders(responseHeaders, 200, "OK");
            TesterAjpMessage responseBody = ajpClient.readMessage();
            validateResponseBody(responseBody, HelloWorldServlet.RESPONSE_TEXT);
            validateResponseEnd(ajpClient.readMessage(), true);

            // Give connections plenty of time to time out
            Thread.sleep(2000);

            // Double check the connection is still open
            validateCpong(ajpClient.cping());
        }

        ajpClient.disconnect();
    }

    @Test
    public void testPost() throws Exception {
        doTestPost(false, HttpServletResponse.SC_OK, "OK");
    }


    @Test
    public void testPostMultipleContentLength() throws Exception {
        // Multiple content lengths
        doTestPost(true, HttpServletResponse.SC_BAD_REQUEST, "Bad Request");
    }


    public void doTestPost(boolean multipleCL, int expectedStatus,
                           String expectedMessage) throws Exception {

        Tomcat tomcat = getTomcatInstance();

        // Use the normal Tomcat ROOT context
        File root = new File("test/webapp-3.0");
        tomcat.addWebapp("", root.getAbsolutePath());

        tomcat.start();

        SimpleAjpClient ajpClient = new SimpleAjpClient();
        ajpClient.setPort(getPort());
        ajpClient.connect();

        validateCpong(ajpClient.cping());

        ajpClient.setUri("/echo-params.jsp");
        ajpClient.setMethod("POST");
        TesterAjpMessage forwardMessage = ajpClient.createForwardMessage();
        forwardMessage.addHeader(0xA008, "9");
        if (multipleCL) {
            forwardMessage.addHeader(0xA008, "99");
        }
        forwardMessage.addHeader(0xA007, "application/x-www-form-urlencoded");
        forwardMessage.end();

        TesterAjpMessage bodyMessage =
                ajpClient.createBodyMessage("test=data".getBytes());

        TesterAjpMessage responseHeaders =
                ajpClient.sendMessage(forwardMessage, bodyMessage);

        validateResponseHeaders(responseHeaders, expectedStatus, expectedMessage);
        if (expectedStatus == HttpServletResponse.SC_OK) {
            // Expect 3 messages: headers, body, end for a valid request
            TesterAjpMessage responseBody = ajpClient.readMessage();
            validateResponseBody(responseBody, "test - data");
            validateResponseEnd(ajpClient.readMessage(), true);

            // Double check the connection is still open
            validateCpong(ajpClient.cping());
        } else {
            // Expect 2 messages: headers, end for an invalid request
            validateResponseEnd(ajpClient.readMessage(), false);
        }


        ajpClient.disconnect();
    }


    /*
     * Bug 55453
     */
    @Test
    public void test304WithBody() throws Exception {

        Tomcat tomcat = getTomcatInstance();

        // Must have a real docBase - just use temp
        Context ctx = tomcat.addContext("", System.getProperty("java.io.tmpdir"));
        Tomcat.addServlet(ctx, "bug55453", new Tester304WithBodyServlet());
        ctx.addServletMapping("/", "bug55453");

        tomcat.start();

        SimpleAjpClient ajpClient = new SimpleAjpClient();
        ajpClient.setPort(getPort());
        ajpClient.connect();

        validateCpong(ajpClient.cping());

        TesterAjpMessage forwardMessage = ajpClient.createForwardMessage();
        forwardMessage.end();

        TesterAjpMessage responseHeaders =
                ajpClient.sendMessage(forwardMessage, null);

        // Expect 2 messages: headers, end
        validateResponseHeaders(responseHeaders, 304, "Not Modified");
        validateResponseEnd(ajpClient.readMessage(), true);

        // Double check the connection is still open
        validateCpong(ajpClient.cping());

        ajpClient.disconnect();
    }


    /**
     * Process response header packet and checks the status. Any other data is
     * ignored.
     */
    private void validateResponseHeaders(TesterAjpMessage message,
            int expectedStatus, String expectedMessage) throws Exception {
        // First two bytes should always be AB
        Assert.assertEquals((byte) 'A', message.buf[0]);
        Assert.assertEquals((byte) 'B', message.buf[1]);

        // Set the start position and read the length
        message.processHeader(false);

        // Check the length
        Assert.assertTrue(message.len > 0);

        // Should be a header message
        Assert.assertEquals(0x04, message.readByte());

        // Check status
        Assert.assertEquals(expectedStatus, message.readInt());

        // Check the reason phrase
        Assert.assertEquals(expectedMessage, message.readString());

        // Get the number of headers
        int headerCount = message.readInt();

        for (int i = 0; i < headerCount; i++) {
            // Read the header name
            message.readHeaderName();
            // Read the header value
            message.readString();
        }
    }

    /**
     * Extract the content from a response message.
     */
    private String extractResponseBody(TesterAjpMessage message)
            throws Exception {

        Assert.assertEquals((byte) 'A', message.buf[0]);
        Assert.assertEquals((byte) 'B', message.buf[1]);

        // Set the start position and read the length
        message.processHeader(false);

        // Should be a body chunk message
        Assert.assertEquals(0x03, message.readByte());

        int len = message.readInt();
        Assert.assertTrue(len > 0);
        return message.readString(len);
    }

    /**
     * Validates that the response message is valid and contains the expected
     * content.
     */
    private void validateResponseBody(TesterAjpMessage message,
            String expectedBody) throws Exception {

        String body = extractResponseBody(message);
        Assert.assertTrue(body.contains(expectedBody));
    }

    private void validateResponseEnd(TesterAjpMessage message,
            boolean expectedReuse) {
        Assert.assertEquals((byte) 'A', message.buf[0]);
        Assert.assertEquals((byte) 'B', message.buf[1]);

        message.processHeader(false);

        // Should be an end body message
        Assert.assertEquals(0x05, message.readByte());

        // Check the length
        Assert.assertEquals(2, message.getLen());

        boolean reuse = false;
        if (message.readByte() > 0) {
            reuse = true;
        }

        Assert.assertEquals(Boolean.valueOf(expectedReuse), Boolean.valueOf(reuse));
    }

    private void validateCpong(TesterAjpMessage message) throws Exception {
        // First two bytes should always be AB
        Assert.assertEquals((byte) 'A', message.buf[0]);
        Assert.assertEquals((byte) 'B', message.buf[1]);
        // CPONG should have a message length of 1
        // This effectively checks the next two bytes
        Assert.assertEquals(1, message.getLen());
        // Data should be the value 9
        Assert.assertEquals(9, message.buf[4]);
    }


    private static class Tester304WithBodyServlet extends HttpServlet {

        private static final long serialVersionUID = 1L;

        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException {

            resp.setStatus(304);
            resp.getWriter().print("Body not permitted for 304 response");
        }
    }
}
