/*
 *  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.ByteArrayInputStream;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.InetAddress;
import java.security.NoSuchProviderException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletResponse;

import org.apache.coyote.AbstractProcessor;
import org.apache.coyote.ActionCode;
import org.apache.coyote.AsyncContextCallback;
import org.apache.coyote.ErrorState;
import org.apache.coyote.InputBuffer;
import org.apache.coyote.OutputBuffer;
import org.apache.coyote.Request;
import org.apache.coyote.RequestInfo;
import org.apache.coyote.Response;
import org.apache.coyote.http11.upgrade.servlet31.HttpUpgradeHandler;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.MessageBytes;
import org.apache.tomcat.util.http.HttpMessages;
import org.apache.tomcat.util.http.MimeHeaders;
import org.apache.tomcat.util.net.AbstractEndpoint;
import org.apache.tomcat.util.net.AbstractEndpoint.Handler.SocketState;
import org.apache.tomcat.util.net.SSLSupport;
import org.apache.tomcat.util.net.SocketStatus;
import org.apache.tomcat.util.res.StringManager;

/**
 * Base class for AJP Processor implementations.
 */
public abstract class AbstractAjpProcessor<S> extends AbstractProcessor<S> {

    /**
     * The string manager for this package.
     */
    protected static final StringManager sm =
        StringManager.getManager(Constants.Package);


    /**
     * End message array.
     */
    protected static final byte[] endMessageArray;
    protected static final byte[] endAndCloseMessageArray;


    /**
     * Flush message array.
     */
    protected static final byte[] flushMessageArray;


    /**
     * Pong message array.
     */
    protected static final byte[] pongMessageArray;


    private static final Set<String> javaxAttributes;
    private static final Set<String> iisTlsAttributes;


    static {
        // Allocate the end message array
        AjpMessage endMessage = new AjpMessage(16);
        endMessage.reset();
        endMessage.appendByte(Constants.JK_AJP13_END_RESPONSE);
        endMessage.appendByte(1);
        endMessage.end();
        endMessageArray = new byte[endMessage.getLen()];
        System.arraycopy(endMessage.getBuffer(), 0, endMessageArray, 0,
                endMessage.getLen());

        // Allocate the end and close message array
        AjpMessage endAndCloseMessage = new AjpMessage(16);
        endAndCloseMessage.reset();
        endAndCloseMessage.appendByte(Constants.JK_AJP13_END_RESPONSE);
        endAndCloseMessage.appendByte(0);
        endAndCloseMessage.end();
        endAndCloseMessageArray = new byte[endAndCloseMessage.getLen()];
        System.arraycopy(endAndCloseMessage.getBuffer(), 0, endAndCloseMessageArray, 0,
                endAndCloseMessage.getLen());

        // Allocate the flush message array
        AjpMessage flushMessage = new AjpMessage(16);
        flushMessage.reset();
        flushMessage.appendByte(Constants.JK_AJP13_SEND_BODY_CHUNK);
        flushMessage.appendInt(0);
        flushMessage.appendByte(0);
        flushMessage.end();
        flushMessageArray = new byte[flushMessage.getLen()];
        System.arraycopy(flushMessage.getBuffer(), 0, flushMessageArray, 0,
                flushMessage.getLen());

        // Allocate the pong message array
        AjpMessage pongMessage = new AjpMessage(16);
        pongMessage.reset();
        pongMessage.appendByte(Constants.JK_AJP13_CPONG_REPLY);
        pongMessage.end();
        pongMessageArray = new byte[pongMessage.getLen()];
        System.arraycopy(pongMessage.getBuffer(), 0, pongMessageArray,
                0, pongMessage.getLen());

        // Build the Set of javax attributes
        Set<String> s = new HashSet<String>();
        s.add("javax.servlet.request.cipher_suite");
        s.add("javax.servlet.request.key_size");
        s.add("javax.servlet.request.ssl_session");
        s.add("javax.servlet.request.X509Certificate");
        javaxAttributes= Collections.unmodifiableSet(s);

        Set<String> iis = new HashSet<String>();
        iis.add("CERT_ISSUER");
        iis.add("CERT_SUBJECT");
        iis.add("CERT_COOKIE");
        iis.add("HTTPS_SERVER_SUBJECT");
        iis.add("CERT_FLAGS");
        iis.add("HTTPS_SECRETKEYSIZE");
        iis.add("CERT_SERIALNUMBER");
        iis.add("HTTPS_SERVER_ISSUER");
        iis.add("HTTPS_KEYSIZE");
        iisTlsAttributes = Collections.unmodifiableSet(iis);
    }


    // ----------------------------------------------------- Instance Variables


    /**
     * GetBody message array. Not static like the other message arrays since the
     * message varies with packetSize and that can vary per connector.
     */
    protected final byte[] getBodyMessageArray;


    /**
     * AJP packet size.
     */
    protected int packetSize;

    /**
     * Header message. Note that this header is merely the one used during the
     * processing of the first message of a "request", so it might not be a
     * request header. It will stay unchanged during the processing of the whole
     * request.
     */
    protected AjpMessage requestHeaderMessage = null;


    /**
     * Message used for response composition.
     */
    protected AjpMessage responseMessage = null;


    /**
     * Body message.
     */
    protected AjpMessage bodyMessage = null;


    /**
     * Body message.
     */
    protected MessageBytes bodyBytes = MessageBytes.newInstance();


    /**
     * Temp message bytes used for processing.
     */
    protected MessageBytes tmpMB = MessageBytes.newInstance();


    /**
     * Byte chunk for certs.
     */
    protected MessageBytes certificates = MessageBytes.newInstance();


    /**
     * End of stream flag.
     */
    protected boolean endOfStream = false;


    /**
     * Body empty flag.
     */
    protected boolean empty = true;


    /**
     * First read.
     */
    protected boolean first = true;


    /**
     * Replay read.
     */
    protected boolean replay = false;


    /**
     * Should any response body be swallowed and not sent to the client.
     */
    private boolean swallowResponse = false;


    /**
     * Finished response.
     */
    protected boolean finished = false;


    /**
     * Bytes written to client for the current request.
     */
    protected long bytesWritten = 0;


    // ------------------------------------------------------------ Constructor

    public AbstractAjpProcessor(int packetSize, AbstractEndpoint<S> endpoint) {

        super(endpoint);

        this.packetSize = packetSize;

        request.setInputBuffer(new SocketInputBuffer());

        requestHeaderMessage = new AjpMessage(packetSize);
        responseMessage = new AjpMessage(packetSize);
        bodyMessage = new AjpMessage(packetSize);

        // Set the getBody message buffer
        AjpMessage getBodyMessage = new AjpMessage(16);
        getBodyMessage.reset();
        getBodyMessage.appendByte(Constants.JK_AJP13_GET_BODY_CHUNK);
        // Adjust read size if packetSize != default (Constants.MAX_PACKET_SIZE)
        getBodyMessage.appendInt(Constants.MAX_READ_SIZE + packetSize -
                Constants.MAX_PACKET_SIZE);
        getBodyMessage.end();
        getBodyMessageArray = new byte[getBodyMessage.getLen()];
        System.arraycopy(getBodyMessage.getBuffer(), 0, getBodyMessageArray,
                0, getBodyMessage.getLen());
    }


    // ------------------------------------------------------------- Properties


    /**
     * Send AJP flush packet when flushing.
     * An flush packet is a zero byte AJP13 SEND_BODY_CHUNK
     * packet. mod_jk and mod_proxy_ajp interprete this as
     * a request to flush data to the client.
     * AJP always does flush at the and of the response, so if
     * it is not important, that the packets get streamed up to
     * the client, do not use extra flush packets.
     * For compatibility and to stay on the safe side, flush
     * packets are enabled by default.
     */
    protected boolean ajpFlush = true;
    public boolean getAjpFlush() { return ajpFlush; }
    public void setAjpFlush(boolean ajpFlush) {
        this.ajpFlush = ajpFlush;
    }


    /**
     * The number of milliseconds Tomcat will wait for a subsequent request
     * before closing the connection. The default is the same as for
     * Apache HTTP Server (15 000 milliseconds).
     */
    protected int keepAliveTimeout = -1;
    public int getKeepAliveTimeout() { return keepAliveTimeout; }
    public void setKeepAliveTimeout(int timeout) { keepAliveTimeout = timeout; }


    /**
     * Use Tomcat authentication ?
     */
    protected boolean tomcatAuthentication = true;
    public boolean getTomcatAuthentication() { return tomcatAuthentication; }
    public void setTomcatAuthentication(boolean tomcatAuthentication) {
        this.tomcatAuthentication = tomcatAuthentication;
    }


    /**
     * Use Tomcat authorization ?
     */
    private boolean tomcatAuthorization = false;
    public boolean getTomcatAuthorization() { return tomcatAuthorization; }
    public void setTomcatAuthorization(boolean tomcatAuthorization) {
        this.tomcatAuthorization = tomcatAuthorization;
    }


    /**
     * Required secret.
     */
    @Deprecated
    protected String requiredSecret = null;
    protected String secret = null;
    public void setSecret(String secret) {
        this.secret = secret;
        this.requiredSecret = secret;
    }
    @Deprecated
    public void setRequiredSecret(String requiredSecret) {
        setSecret(requiredSecret);
    }


    /**
     * When client certificate information is presented in a form other than
     * instances of {@link java.security.cert.X509Certificate} it needs to be
     * converted before it can be used and this property controls which JSSE
     * provider is used to perform the conversion. For example it is used with
     * the AJP connectors, the HTTP APR connector and with the
     * {@link org.apache.catalina.valves.SSLValve}. If not specified, the
     * default provider will be used.
     */
    protected String clientCertProvider = null;
    public String getClientCertProvider() { return clientCertProvider; }
    public void setClientCertProvider(String s) { this.clientCertProvider = s; }


    private Pattern allowedRequestAttributesPatternPattern;
    public void setAllowedRequestAttributesPatternPattern(Pattern allowedRequestAttributesPatternPattern) {
        this.allowedRequestAttributesPatternPattern = allowedRequestAttributesPatternPattern;
    }


    // --------------------------------------------------------- Public Methods

    /**
     * Send an action to the connector.
     *
     * @param actionCode Type of the action
     * @param param Action parameter
     */
    @Override
    public final void action(ActionCode actionCode, Object param) {

        switch (actionCode) {
        case COMMIT: {
            if (response.isCommitted())
                return;

            // Validate and write response headers
            try {
                prepareResponse();
            } catch (IOException e) {
                setErrorState(ErrorState.CLOSE_NOW, e);
            }

            try {
                flush(false);
            } catch (IOException e) {
                setErrorState(ErrorState.CLOSE_NOW, e);
            }
            break;
        }
        case CLIENT_FLUSH: {
            if (!response.isCommitted()) {
                // Validate and write response headers
                try {
                    prepareResponse();
                } catch (IOException e) {
                    setErrorState(ErrorState.CLOSE_NOW, e);
                    return;
                }
            }

            try {
                flush(true);
            } catch (IOException e) {
                setErrorState(ErrorState.CLOSE_NOW, e);
            }
            break;
        }
        case IS_ERROR: {
            ((AtomicBoolean) param).set(getErrorState().isError());
            break;
        }
        case DISABLE_SWALLOW_INPUT: {
            // TODO: Do not swallow request input but
            // make sure we are closing the connection
            setErrorState(ErrorState.CLOSE_CLEAN, null);
            break;
        }
        case CLOSE: {
            // Close
            // End the processing of the current request, and stop any further
            // transactions with the client

            try {
                finish();
            } catch (IOException e) {
                setErrorState(ErrorState.CLOSE_NOW, e);
            }
            break;
        }
        case REQ_SSL_ATTRIBUTE: {
            if (!certificates.isNull()) {
                ByteChunk certData = certificates.getByteChunk();
                X509Certificate jsseCerts[] = null;
                ByteArrayInputStream bais =
                    new ByteArrayInputStream(certData.getBytes(),
                            certData.getStart(),
                            certData.getLength());
                // Fill the  elements.
                try {
                    CertificateFactory cf;
                    if (clientCertProvider == null) {
                        cf = CertificateFactory.getInstance("X.509");
                    } else {
                        cf = CertificateFactory.getInstance("X.509",
                                clientCertProvider);
                    }
                    while(bais.available() > 0) {
                        X509Certificate cert = (X509Certificate)
                        cf.generateCertificate(bais);
                        if(jsseCerts == null) {
                            jsseCerts = new X509Certificate[1];
                            jsseCerts[0] = cert;
                        } else {
                            X509Certificate [] temp = new X509Certificate[jsseCerts.length+1];
                            System.arraycopy(jsseCerts,0,temp,0,jsseCerts.length);
                            temp[jsseCerts.length] = cert;
                            jsseCerts = temp;
                        }
                    }
                } catch (java.security.cert.CertificateException e) {
                    getLog().error(sm.getString("ajpprocessor.certs.fail"), e);
                    return;
                } catch (NoSuchProviderException e) {
                    getLog().error(sm.getString("ajpprocessor.certs.fail"), e);
                    return;
                }
                request.setAttribute(SSLSupport.CERTIFICATE_KEY, jsseCerts);
            }
            break;
        }
        case REQ_HOST_ATTRIBUTE: {
            // Get remote host name using a DNS resolution
            if (request.remoteHost().isNull()) {
                try {
                    request.remoteHost().setString(InetAddress.getByName
                            (request.remoteAddr().toString()).getHostName());
                } catch (IOException iex) {
                    // Ignore
                }
            }
            break;
        }
        case REQ_LOCAL_ADDR_ATTRIBUTE: {
            // Automatically populated during prepareRequest() when using
            // modern AJP forwarder, otherwise copy from local name
            if (request.localAddr().isNull()) {
                request.localAddr().setString(request.localName().toString());
            }
            break;
        }
        case REQ_SET_BODY_REPLAY: {
            // Set the given bytes as the content
            ByteChunk bc = (ByteChunk) param;
            int length = bc.getLength();
            bodyBytes.setBytes(bc.getBytes(), bc.getStart(), length);
            request.setContentLength(length);
            first = false;
            empty = false;
            replay = true;
            endOfStream = false;
            break;
        }
        case ASYNC_START: {
            asyncStateMachine.asyncStart((AsyncContextCallback) param);
            // Async time out is based on SocketWrapper access time
            getSocketWrapper().access();
            break;
        }
        case ASYNC_DISPATCHED: {
            asyncStateMachine.asyncDispatched();
            break;
        }
        case ASYNC_TIMEOUT: {
            AtomicBoolean result = (AtomicBoolean) param;
            result.set(asyncStateMachine.asyncTimeout());
            break;
        }
        case ASYNC_RUN: {
            asyncStateMachine.asyncRun((Runnable) param);
            break;
        }
        case ASYNC_ERROR: {
            asyncStateMachine.asyncError();
            break;
        }
        case ASYNC_IS_STARTED: {
            ((AtomicBoolean) param).set(asyncStateMachine.isAsyncStarted());
            break;
        }
        case ASYNC_IS_COMPLETING: {
            ((AtomicBoolean) param).set(asyncStateMachine.isCompleting());
            break;
        }
        case ASYNC_IS_DISPATCHING: {
            ((AtomicBoolean) param).set(asyncStateMachine.isAsyncDispatching());
            break;
        }
        case ASYNC_IS_ASYNC: {
            ((AtomicBoolean) param).set(asyncStateMachine.isAsync());
            break;
        }
        case ASYNC_IS_TIMINGOUT: {
            ((AtomicBoolean) param).set(asyncStateMachine.isAsyncTimingOut());
            break;
        }
        case ASYNC_IS_ERROR: {
            ((AtomicBoolean) param).set(asyncStateMachine.isAsyncError());
            break;
        }
        case ASYNC_POST_PROCESS: {
            asyncStateMachine.asyncPostProcess();
            break;
        }
        case UPGRADE_TOMCAT: {
            // HTTP connections only. Unsupported for AJP.
            // NOOP
            break;
        }
        case CLOSE_NOW: {
            // Prevent further writes to the response
            swallowResponse = true;
            if (param instanceof Throwable) {
                setErrorState(ErrorState.CLOSE_NOW, (Throwable) param);
            } else {
                setErrorState(ErrorState.CLOSE_NOW, null);
            }
            break;
        }
        case END_REQUEST: {
            // NO-OP for AJP
            break;
        }
        default: {
            actionInternal(actionCode, param);
            break;
        }
        }
    }


    @Override
    public SocketState asyncDispatch(SocketStatus status) {

        RequestInfo rp = request.getRequestProcessor();
        try {
            rp.setStage(org.apache.coyote.Constants.STAGE_SERVICE);
            if(!getAdapter().asyncDispatch(request, response, status)) {
                setErrorState(ErrorState.CLOSE_NOW, null);
            }
            resetTimeouts();
        } catch (InterruptedIOException e) {
            setErrorState(ErrorState.CLOSE_NOW, e);
        } catch (Throwable t) {
            ExceptionUtils.handleThrowable(t);
            setErrorState(ErrorState.CLOSE_NOW, t);
            getLog().error(sm.getString("http11processor.request.process"), t);
        } finally {
            if (getErrorState().isError()) {
                // 500 - Internal Server Error
                response.setStatus(500);
                adapter.log(request, response, 0);
            }
        }

        rp.setStage(org.apache.coyote.Constants.STAGE_ENDED);

        SocketState state;

        if (isAsync()) {
            if (getErrorState().isError()) {
                request.updateCounters();
                state = SocketState.CLOSED;
            } else {
                state = SocketState.LONG;
            }
        } else {
            request.updateCounters();
            if (getErrorState().isError() || endpoint.isPaused()) {
                state = SocketState.CLOSED;
            } else {
                recycle(false);
                state = SocketState.OPEN;
            }
        }

        if (getLog().isDebugEnabled()) {
            getLog().debug("Socket: [" + socketWrapper +
                    "], Status in: [" + status +
                    "], State out: [" + state + "]");
        }

        return state;
    }


    @Override
    public void setSslSupport(SSLSupport sslSupport) {
        // Should never reach this code but in case we do...
        throw new IllegalStateException(
                sm.getString("ajpprocessor.ssl.notsupported"));
    }


    @Override
    public SocketState event(SocketStatus status) throws IOException {
        // Should never reach this code but in case we do...
        throw new IOException(
                sm.getString("ajpprocessor.comet.notsupported"));
    }


    @Override
    public SocketState upgradeDispatch() throws IOException {
        // Should never reach this code but in case we do...
        throw new IOException(
                sm.getString("ajpprocessor.httpupgrade.notsupported"));
    }


    /**
     * @deprecated  Will be removed in Tomcat 8.0.x.
     */
    @Deprecated
    @Override
    public org.apache.coyote.http11.upgrade.UpgradeInbound getUpgradeInbound() {
        // Can't throw exception as this is used to test if connection has been
        // upgraded using Tomcat's proprietary HTTP upgrade mechanism.
        return null;
    }


    @Override
    public SocketState upgradeDispatch(SocketStatus status) throws IOException {
        // Should never reach this code but in case we do...
        throw new IOException(
                sm.getString("ajpprocessor.httpupgrade.notsupported"));
    }


    @Override
    public HttpUpgradeHandler getHttpUpgradeHandler() {
        // Should never reach this code but in case we do...
        throw new IllegalStateException(
                sm.getString("ajpprocessor.httpupgrade.notsupported"));
    }


    /**
     * Recycle the processor, ready for the next request which may be on the
     * same connection or a different connection.
     *
     * @param socketClosing Indicates if the socket is about to be closed
     *                      allowing the processor to perform any additional
     *                      clean-up that may be required
     */
    @Override
    public void recycle(boolean socketClosing) {
        getAdapter().checkRecycled(request, response);

        asyncStateMachine.recycle();

        // Recycle Request object
        first = true;
        endOfStream = false;
        empty = true;
        replay = false;
        finished = false;
        request.recycle();
        response.recycle();
        certificates.recycle();
        swallowResponse = false;
        bytesWritten = 0;
        resetErrorState();
    }


    // ------------------------------------------------------ Protected Methods

    // Methods called by action()
    protected abstract void actionInternal(ActionCode actionCode, Object param);


    // Methods called by asyncDispatch
    /**
     * Provides a mechanism for those connector implementations (currently only
     * NIO) that need to reset timeouts from Async timeouts to standard HTTP
     * timeouts once async processing completes.
     */
    protected abstract void resetTimeouts();


    // Methods called by prepareResponse()
    protected abstract void output(byte[] src, int offset, int length)
            throws IOException;


    // Methods used by SocketInputBuffer
    protected abstract boolean receive() throws IOException;


    @Override
    public final boolean isComet() {
        // AJP does not support Comet
        return false;
    }


    @Override
    public final boolean isUpgrade() {
        // AJP does not support HTTP upgrade
        return false;
    }


    /**
     * Get more request body data from the web server and store it in the
     * internal buffer.
     *
     * @return true if there is more data, false if not.
     * @throws IOException An IO error occurred
     */
    protected boolean refillReadBuffer() throws IOException {
        // If the server returns an empty packet, assume that that end of
        // the stream has been reached (yuck -- fix protocol??).
        // FORM support
        if (replay) {
            endOfStream = true; // we've read everything there is
        }
        if (endOfStream) {
            return false;
        }

        // Request more data immediately
        output(getBodyMessageArray, 0, getBodyMessageArray.length);

        boolean moreData = receive();
        if( !moreData ) {
            endOfStream = true;
        }
        return moreData;
    }


    /**
     * After reading the request headers, we have to setup the request filters.
     */
    protected void prepareRequest() {

        // Translate the HTTP method code to a String.
        byte methodCode = requestHeaderMessage.getByte();
        if (methodCode != Constants.SC_M_JK_STORED) {
            String methodName = Constants.getMethodForCode(methodCode - 1);
            request.method().setString(methodName);
        }

        requestHeaderMessage.getBytes(request.protocol());
        requestHeaderMessage.getBytes(request.requestURI());

        requestHeaderMessage.getBytes(request.remoteAddr());
        requestHeaderMessage.getBytes(request.remoteHost());
        requestHeaderMessage.getBytes(request.localName());
        request.setLocalPort(requestHeaderMessage.getInt());

        boolean isSSL = requestHeaderMessage.getByte() != 0;
        if (isSSL) {
            request.scheme().setString("https");
        }

        // Decode headers
        MimeHeaders headers = request.getMimeHeaders();

        // Set this every time in case limit has been changed via JMX
        headers.setLimit(endpoint.getMaxHeaderCount());
        request.getCookies().setLimit(getMaxCookieCount());

        boolean contentLengthSet = false;
        int hCount = requestHeaderMessage.getInt();
        for(int i = 0 ; i < hCount ; i++) {
            String hName = null;

            // Header names are encoded as either an integer code starting
            // with 0xA0, or as a normal string (in which case the first
            // two bytes are the length).
            int isc = requestHeaderMessage.peekInt();
            int hId = isc & 0xFF;

            MessageBytes vMB = null;
            isc &= 0xFF00;
            if(0xA000 == isc) {
                requestHeaderMessage.getInt(); // To advance the read position
                hName = Constants.getHeaderForCode(hId - 1);
                vMB = headers.addValue(hName);
            } else {
                // reset hId -- if the header currently being read
                // happens to be 7 or 8 bytes long, the code below
                // will think it's the content-type header or the
                // content-length header - SC_REQ_CONTENT_TYPE=7,
                // SC_REQ_CONTENT_LENGTH=8 - leading to unexpected
                // behaviour.  see bug 5861 for more information.
                hId = -1;
                requestHeaderMessage.getBytes(tmpMB);
                ByteChunk bc = tmpMB.getByteChunk();
                vMB = headers.addValue(bc.getBuffer(),
                        bc.getStart(), bc.getLength());
            }

            requestHeaderMessage.getBytes(vMB);

            if (hId == Constants.SC_REQ_CONTENT_LENGTH ||
                    (hId == -1 && tmpMB.equalsIgnoreCase("Content-Length"))) {
                long cl = vMB.getLong();
                if (contentLengthSet) {
                    response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
                    setErrorState(ErrorState.CLOSE_CLEAN, null);
                } else {
                    contentLengthSet = true;
                    // Set the content-length header for the request
                    request.setContentLength(cl);
                }
            } else if (hId == Constants.SC_REQ_CONTENT_TYPE ||
                    (hId == -1 && tmpMB.equalsIgnoreCase("Content-Type"))) {
                // just read the content-type header, so set it
                ByteChunk bchunk = vMB.getByteChunk();
                request.contentType().setBytes(bchunk.getBytes(),
                        bchunk.getOffset(),
                        bchunk.getLength());
            }
        }

        // Decode extra attributes
        boolean secretPresentInRequest = false;
        byte attributeCode;
        while ((attributeCode = requestHeaderMessage.getByte())
                != Constants.SC_A_ARE_DONE) {

            switch (attributeCode) {

            case Constants.SC_A_REQ_ATTRIBUTE :
                requestHeaderMessage.getBytes(tmpMB);
                String n = tmpMB.toString();
                requestHeaderMessage.getBytes(tmpMB);
                String v = tmpMB.toString();
                /*
                 * AJP13 misses to forward the local IP address and the
                 * remote port. Allow the AJP connector to add this info via
                 * private request attributes.
                 * We will accept the forwarded data and remove it from the
                 * public list of request attributes.
                 */
                if(n.equals(Constants.SC_A_REQ_LOCAL_ADDR)) {
                    request.localAddr().setString(v);
                } else if(n.equals(Constants.SC_A_REQ_REMOTE_PORT)) {
                    try {
                        request.setRemotePort(Integer.parseInt(v));
                    } catch (NumberFormatException nfe) {
                        // Ignore invalid value
                    }
                } else if(n.equals(Constants.SC_A_SSL_PROTOCOL)) {
                    request.setAttribute(SSLSupport.PROTOCOL_VERSION_KEY, v);
                } else if (n.equals("JK_LB_ACTIVATION")) {
                    request.setAttribute(n, v);
                } else if (javaxAttributes.contains(n)) {
                    request.setAttribute(n, v);
                } else if (iisTlsAttributes.contains(n)) {
                    // Allow IIS TLS attributes
                    request.setAttribute(n, v);
                } else {
                    // All 'known' attributes will be processed by the previous
                    // blocks. Any remaining attribute is an 'arbitrary' one.
                    if (allowedRequestAttributesPatternPattern != null &&
                            allowedRequestAttributesPatternPattern.matcher(n).matches() ) {
                        request.setAttribute(n, v);
                    } else {
                        getLog().warn(sm.getString("ajpprocessor.unknownAttribute", n));
                        response.setStatus(403);
                        setErrorState(ErrorState.CLOSE_CLEAN, null);
                    }
                }
                break;

            case Constants.SC_A_CONTEXT :
                requestHeaderMessage.getBytes(tmpMB);
                // nothing
                break;

            case Constants.SC_A_SERVLET_PATH :
                requestHeaderMessage.getBytes(tmpMB);
                // nothing
                break;

            case Constants.SC_A_REMOTE_USER :
                if (tomcatAuthorization || !tomcatAuthentication) {
                    // Implies tomcatAuthentication == false
                    requestHeaderMessage.getBytes(request.getRemoteUser());
                    request.setRemoteUserNeedsAuthorization(tomcatAuthorization);
                } else {
                    // Ignore user information from reverse proxy
                    requestHeaderMessage.getBytes(tmpMB);
                }
                break;

            case Constants.SC_A_AUTH_TYPE :
                if (tomcatAuthentication) {
                    // ignore server
                    requestHeaderMessage.getBytes(tmpMB);
                } else {
                    requestHeaderMessage.getBytes(request.getAuthType());
                }
                break;

            case Constants.SC_A_QUERY_STRING :
                requestHeaderMessage.getBytes(request.queryString());
                break;

            case Constants.SC_A_JVM_ROUTE :
                requestHeaderMessage.getBytes(request.instanceId());
                break;

            case Constants.SC_A_SSL_CERT :
                request.scheme().setString("https");
                // SSL certificate extraction is lazy, moved to JkCoyoteHandler
                requestHeaderMessage.getBytes(certificates);
                break;

            case Constants.SC_A_SSL_CIPHER :
                request.scheme().setString("https");
                requestHeaderMessage.getBytes(tmpMB);
                request.setAttribute(SSLSupport.CIPHER_SUITE_KEY,
                        tmpMB.toString());
                break;

            case Constants.SC_A_SSL_SESSION :
                request.scheme().setString("https");
                requestHeaderMessage.getBytes(tmpMB);
                request.setAttribute(SSLSupport.SESSION_ID_KEY,
                        tmpMB.toString());
                break;

            case Constants.SC_A_SSL_KEY_SIZE :
                request.setAttribute(SSLSupport.KEY_SIZE_KEY,
                        Integer.valueOf(requestHeaderMessage.getInt()));
                break;

            case Constants.SC_A_STORED_METHOD:
                requestHeaderMessage.getBytes(request.method());
                break;

            case Constants.SC_A_SECRET:
                requestHeaderMessage.getBytes(tmpMB);
                if (secret != null && secret.length() > 0) {
                    secretPresentInRequest = true;
                    if (!tmpMB.equals(secret)) {
                        response.setStatus(403);
                        setErrorState(ErrorState.CLOSE_CLEAN, null);
                    }
                }
                break;

            default:
                // Ignore unknown attribute for backward compatibility
                break;

            }

        }

        // Check if secret was submitted if required
        if (secret != null && secret.length() > 0 && !secretPresentInRequest) {
            response.setStatus(403);
            setErrorState(ErrorState.CLOSE_CLEAN, null);
        }

        // Check for a full URI (including protocol://host:port/)
        ByteChunk uriBC = request.requestURI().getByteChunk();
        if (uriBC.startsWithIgnoreCase("http", 0)) {

            int pos = uriBC.indexOf("://", 0, 3, 4);
            int uriBCStart = uriBC.getStart();
            int slashPos = -1;
            if (pos != -1) {
                byte[] uriB = uriBC.getBytes();
                slashPos = uriBC.indexOf('/', pos + 3);
                if (slashPos == -1) {
                    slashPos = uriBC.getLength();
                    // Set URI as "/"
                    request.requestURI().setBytes
                    (uriB, uriBCStart + pos + 1, 1);
                } else {
                    request.requestURI().setBytes
                    (uriB, uriBCStart + slashPos,
                            uriBC.getLength() - slashPos);
                }
                MessageBytes hostMB = headers.setValue("host");
                hostMB.setBytes(uriB, uriBCStart + pos + 3,
                        slashPos - pos - 3);
            }

        }

        MessageBytes valueMB = request.getMimeHeaders().getValue("host");
        parseHost(valueMB);

        if (getErrorState().isError()) {
            adapter.log(request, response, 0);
        }
    }


    /**
     * {@inheritDoc}
     * <p>
     * This implementation populates the server name from the local name
     * provided by the AJP message.
     */
    @Override
    protected void populateHost() {
        try {
            request.serverName().duplicate(request.localName());
        } catch (IOException e) {
            response.setStatus(400);
            setErrorState(ErrorState.CLOSE_CLEAN, e);
        }
    }


    /**
     * {@inheritDoc}
     * <p>
     * This implementation populates the server port from the local port
     * provided by the AJP message.
     */
    @Override
    protected void populatePort() {
        // No host information (HTTP/1.0)
        request.setServerPort(request.getLocalPort());
    }


    /**
     * When committing the response, we have to validate the set of headers, as
     * well as setup the response filters.
     * @throws IOException An IO error occurred
     */
    protected void prepareResponse() throws IOException {

        response.setCommitted(true);

        responseMessage.reset();
        responseMessage.appendByte(Constants.JK_AJP13_SEND_HEADERS);

        // Responses with certain status codes are not permitted to include a
        // response body.
        int statusCode = response.getStatus();
        if (statusCode < 200 || statusCode == 204 || statusCode == 205 ||
                statusCode == 304) {
            // No entity body
            swallowResponse = true;
        }

        // Responses to HEAD requests are not permitted to incude a response
        // body.
        MessageBytes methodMB = request.method();
        if (methodMB.equals("HEAD")) {
            // No entity body
            swallowResponse = true;
        }

        // HTTP header contents
        responseMessage.appendInt(statusCode);
        String message = null;
        if (org.apache.coyote.Constants.USE_CUSTOM_STATUS_MSG_IN_HEADER &&
                HttpMessages.isSafeInHttpHeader(response.getMessage())) {
            message = response.getMessage();
        }
        if (message == null){
            message = HttpMessages.getInstance(
                    response.getLocale()).getMessage(response.getStatus());
        }
        if (message == null) {
            // mod_jk + httpd 2.x fails with a null status message - bug 45026
            message = Integer.toString(response.getStatus());
        }
        tmpMB.setString(message);
        responseMessage.appendBytes(tmpMB);

        // Special headers
        MimeHeaders headers = response.getMimeHeaders();
        String contentType = response.getContentType();
        if (contentType != null) {
            headers.setValue("Content-Type").setString(contentType);
        }
        String contentLanguage = response.getContentLanguage();
        if (contentLanguage != null) {
            headers.setValue("Content-Language").setString(contentLanguage);
        }
        long contentLength = response.getContentLengthLong();
        if (contentLength >= 0) {
            headers.setValue("Content-Length").setLong(contentLength);
        }

        // Other headers
        int numHeaders = headers.size();
        responseMessage.appendInt(numHeaders);
        for (int i = 0; i < numHeaders; i++) {
            MessageBytes hN = headers.getName(i);
            int hC = Constants.getResponseAjpIndex(hN.toString());
            if (hC > 0) {
                responseMessage.appendInt(hC);
            }
            else {
                responseMessage.appendBytes(hN);
            }
            MessageBytes hV=headers.getValue(i);
            responseMessage.appendBytes(hV);
        }

        // Write to buffer
        responseMessage.end();
        output(responseMessage.getBuffer(), 0,
                responseMessage.getLen());
    }


    /**
     * Callback to write data from the buffer.
     *
     * @param explicit  If {@code true} a flush message is sent, otherwise this
     *                  method is a NO-OP
     *
     * @throws IOException An IO error occurred
     */
    protected void flush(boolean explicit) throws IOException {
        if (ajpFlush && explicit && !finished) {
            // Send the flush message
            output(flushMessageArray, 0, flushMessageArray.length);
        }
    }


    /**
     * Finish AJP response.
     * @throws IOException An IO error occurred
     */
    protected void finish() throws IOException {

        if (!response.isCommitted()) {
            // Validate and write response headers
            try {
                prepareResponse();
            } catch (IOException e) {
                setErrorState(ErrorState.CLOSE_NOW, e);
                return;
            }
        }

        if (finished)
            return;

        finished = true;

        // Swallow the unread body packet if present
        if (first && request.getContentLengthLong() > 0) {
            receive();
        }

        // Add the end message
        if (getErrorState().isError()) {
            output(endAndCloseMessageArray, 0, endAndCloseMessageArray.length);
        } else {
            output(endMessageArray, 0, endMessageArray.length);
        }
    }


    // ------------------------------------- InputStreamInputBuffer Inner Class

    /**
     * This class is an input buffer which will read its data from an input
     * stream.
     */
    protected class SocketInputBuffer implements InputBuffer {

        /**
         * Read bytes into the specified chunk.
         */
        @Override
        public int doRead(ByteChunk chunk, Request req) throws IOException {

            if (endOfStream) {
                return -1;
            }
            if (first && req.getContentLengthLong() > 0) {
                // Handle special first-body-chunk
                if (!receive()) {
                    return 0;
                }
            } else if (empty) {
                if (!refillReadBuffer()) {
                    return -1;
                }
            }
            ByteChunk bc = bodyBytes.getByteChunk();
            chunk.setBytes(bc.getBuffer(), bc.getStart(), bc.getLength());
            empty = true;
            return chunk.getLength();
        }

        @Override
        public int available() {
            if (empty) {
                return 0;
            } else {
                return bodyBytes.getByteChunk().getLength();
            }
        }
    }


    // ----------------------------------- OutputStreamOutputBuffer Inner Class

    /**
     * This class is an output buffer which will write data to an output
     * stream.
     */
    protected class SocketOutputBuffer implements OutputBuffer {

        /**
         * Write chunk.
         */
        @Override
        public int doWrite(ByteChunk chunk, Response res)
            throws IOException {

            if (!response.isCommitted()) {
                // Validate and write response headers
                try {
                    prepareResponse();
                } catch (IOException e) {
                    setErrorState(ErrorState.CLOSE_NOW, e);
                }
            }

            if (!swallowResponse) {
                try {
                    int len = chunk.getLength();
                    // 4 - hardcoded, byte[] marshaling overhead
                    // Adjust allowed size if packetSize != default (Constants.MAX_PACKET_SIZE)
                    int chunkSize = Constants.MAX_SEND_SIZE + packetSize - Constants.MAX_PACKET_SIZE;
                    int off = 0;
                    while (len > 0) {
                        int thisTime = len;
                        if (thisTime > chunkSize) {
                            thisTime = chunkSize;
                        }
                        len -= thisTime;
                        responseMessage.reset();
                        responseMessage.appendByte(Constants.JK_AJP13_SEND_BODY_CHUNK);
                        responseMessage.appendBytes(chunk.getBytes(), chunk.getOffset() + off, thisTime);
                        responseMessage.end();
                        output(responseMessage.getBuffer(), 0, responseMessage.getLen());

                        off += thisTime;
                    }

                    bytesWritten += chunk.getLength();
                } catch (IOException ioe) {
                    response.action(ActionCode.CLOSE_NOW, ioe);
                    // Re-throw
                    throw ioe;
                }
            }
            return chunk.getLength();
        }

        @Override
        public long getBytesWritten() {
            return bytesWritten;
        }
    }
}
