/*
 *  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.http11;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.URLEncoder;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;

import org.apache.coyote.ActionCode;
import org.apache.coyote.ActionHook;
import org.apache.coyote.Adapter;
import org.apache.coyote.ProtocolHandler;
import org.apache.coyote.RequestGroupInfo;
import org.apache.tomcat.util.net.PoolTcpEndpoint;
import org.apache.tomcat.util.net.SSLImplementation;
import org.apache.tomcat.util.net.SSLSupport;
import org.apache.tomcat.util.net.ServerSocketFactory;
import org.apache.tomcat.util.net.TcpConnection;
import org.apache.tomcat.util.net.TcpConnectionHandler;
import org.apache.tomcat.util.res.StringManager;
import org.apache.tomcat.util.threads.ThreadPool;


/**
 * Abstract the protocol implementation, including threading, etc.
 * Processor is single threaded and specific to stream-based protocols,
 * will not fit Jk protocols like JNI.
 *
 * @author Remy Maucherat
 * @author Costin Manolache
 */
public class Http11BaseProtocol implements ProtocolHandler
{
    public Http11BaseProtocol() {
        setSoLinger(Constants.DEFAULT_CONNECTION_LINGER);
        setSoTimeout(Constants.DEFAULT_CONNECTION_TIMEOUT);
        setServerSoTimeout(Constants.DEFAULT_SERVER_SOCKET_TIMEOUT);
        setTcpNoDelay(Constants.DEFAULT_TCP_NO_DELAY);
    }

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

    /** Pass config info
     */
    public void setAttribute( String name, Object value ) {
        if( log.isTraceEnabled())
            log.trace(sm.getString("http11protocol.setattribute", name, value));

        attributes.put(name, value);
    }

    public Object getAttribute( String key ) {
        if( log.isTraceEnabled())
            log.trace(sm.getString("http11protocol.getattribute", key));
        return attributes.get(key);
    }

    public Iterator getAttributeNames() {
        return attributes.keySet().iterator();
    }

    /**
     * Set a property.
     */
    public void setProperty(String name, String value) {
        setAttribute(name, value);
    }

    /**
     * Get a property
     */
    public String getProperty(String name) {
        return (String)getAttribute(name);
    }

    /** The adapter, used to call the connector
     */
    public void setAdapter(Adapter adapter) {
        this.adapter=adapter;
    }

    public Adapter getAdapter() {
        return adapter;
    }
    
    protected Http11ConnectionHandler createConnectionHandler() {
        return new Http11ConnectionHandler( this );
    }

    /** Start the protocol
     */
    public void init() throws Exception {
        cHandler = createConnectionHandler() ;
        ep.setConnectionHandler( cHandler );
        try {
            checkSocketFactory();
        } catch( Exception ex ) {
            log.error(sm.getString("http11protocol.socketfactory.initerror"),
                      ex);
            throw ex;
        }

        if( socketFactory!=null ) {
            Enumeration attE=attributes.keys();
            while( attE.hasMoreElements() ) {
                String key=(String)attE.nextElement();
                Object v=attributes.get( key );
                socketFactory.setAttribute( key, v );
            }
        }

        // XXX get domain from registration
        try {
            ep.initEndpoint();
        } catch (Exception ex) {
            log.error(sm.getString("http11protocol.endpoint.initerror"), ex);
            throw ex;
        }
        if(log.isInfoEnabled())
            log.info(sm.getString("http11protocol.init", getName()));

    }

    public void start() throws Exception {
        try {
            ep.startEndpoint();
        } catch (Exception ex) {
            log.error(sm.getString("http11protocol.endpoint.starterror"), ex);
            throw ex;
        }
        if(log.isInfoEnabled())
            log.info(sm.getString("http11protocol.start", getName()));
    }

    public void pause() throws Exception {
        try {
            ep.pauseEndpoint();
        } catch (Exception ex) {
            log.error(sm.getString("http11protocol.endpoint.pauseerror"), ex);
            throw ex;
        }
        if(log.isInfoEnabled())
            log.info(sm.getString("http11protocol.pause", getName()));
    }

    public void resume() throws Exception {
        try {
            ep.resumeEndpoint();
        } catch (Exception ex) {
            log.error(sm.getString("http11protocol.endpoint.resumeerror"), ex);
            throw ex;
        }
        if(log.isInfoEnabled())
            log.info(sm.getString("http11protocol.resume", getName()));
    }

    public void destroy() throws Exception {
        if(log.isInfoEnabled())
            log.info(sm.getString("http11protocol.stop", getName()));
        ep.stopEndpoint();
    }

    // -------------------- Properties--------------------
    protected ThreadPool tp=ThreadPool.createThreadPool(true);
    protected PoolTcpEndpoint ep=new PoolTcpEndpoint(tp);
    protected boolean secure;

    protected ServerSocketFactory socketFactory;
    protected SSLImplementation sslImplementation;
    // socket factory attriubtes ( XXX replace with normal setters )
    protected Hashtable attributes = new Hashtable();
    protected String socketFactoryName=null;
    protected String sslImplementationName=null;

    private int maxKeepAliveRequests=100; // as in Apache HTTPD server
    private int timeout = 300000;   // 5 minutes as in Apache HTTPD server
    private int maxSavePostSize = 4 * 1024;
    private int maxHttpHeaderSize = 8 * 1024;
    private String reportedname;
    private int socketCloseDelay=-1;
    private boolean disableUploadTimeout = true;
    private int socketBuffer = 9000;
    private Adapter adapter;
    protected Http11ConnectionHandler cHandler;

    /**
     * Compression value.
     */
    private String compression = "off";
    private String noCompressionUserAgents = null;
    private String restrictedUserAgents = null;
    private String compressableMimeTypes = "text/html,text/xml,text/plain";
    private int compressionMinSize    = 2048;

    private String server;

    // -------------------- Pool setup --------------------

    public int getMaxThreads() {
        return ep.getMaxThreads();
    }

    public void setMaxThreads( int maxThreads ) {
        ep.setMaxThreads(maxThreads);
        setAttribute("maxThreads", "" + maxThreads);
    }

    public int getMaxSpareThreads() {
        return ep.getMaxSpareThreads();
    }

    public void setMaxSpareThreads( int maxThreads ) {
        ep.setMaxSpareThreads(maxThreads);
        setAttribute("maxSpareThreads", "" + maxThreads);
    }

    public int getMinSpareThreads() {
        return ep.getMinSpareThreads();
    }

    public void setMinSpareThreads( int minSpareThreads ) {
        ep.setMinSpareThreads(minSpareThreads);
        setAttribute("minSpareThreads", "" + minSpareThreads);
    }

    public void setThreadPriority(int threadPriority) {
      ep.setThreadPriority(threadPriority);
      setAttribute("threadPriority", "" + threadPriority);
    }

    public int getThreadPriority() {
      return ep.getThreadPriority();
    }

    public void setStrategy(String strategy) {
        ep.setStrategy(strategy);
        setAttribute("strategy", strategy);
      }

      public String getStrategy() {
        return ep.getStrategy();
      }

    // -------------------- Tcp setup --------------------

    public int getBacklog() {
        return ep.getBacklog();
    }

    public void setBacklog( int i ) {
        ep.setBacklog(i);
        setAttribute("backlog", "" + i);
    }

    public int getPort() {
        return ep.getPort();
    }

    public void setPort( int port ) {
        ep.setPort(port);
        setAttribute("port", "" + port);
    }

    public InetAddress getAddress() {
        return ep.getAddress();
    }

    public void setAddress(InetAddress ia) {
        ep.setAddress( ia );
        setAttribute("address", "" + ia);
    }

    public String getName() {
        String encodedAddr = "";
        if (getAddress() != null) {
            encodedAddr = "" + getAddress();
            if (encodedAddr.startsWith("/"))
                encodedAddr = encodedAddr.substring(1);
            encodedAddr = URLEncoder.encode(encodedAddr) + "-";
        }
        return ("http-" + encodedAddr + ep.getPort());
    }

    public String getSocketFactory() {
        return socketFactoryName;
    }

    public void setSocketFactory( String valueS ) {
        socketFactoryName = valueS;
        setAttribute("socketFactory", valueS);
    }

    public String getSSLImplementation() {
        return sslImplementationName;
    }

    public void setSSLImplementation( String valueS) {
        sslImplementationName = valueS;
        setSecure(true);
        setAttribute("sslImplementation", valueS);
    }

    public boolean getTcpNoDelay() {
        return ep.getTcpNoDelay();
    }

    public void setTcpNoDelay( boolean b ) {
        ep.setTcpNoDelay( b );
        setAttribute("tcpNoDelay", "" + b);
    }

    public boolean getDisableUploadTimeout() {
        return disableUploadTimeout;
    }

    public void setDisableUploadTimeout(boolean isDisabled) {
        disableUploadTimeout = isDisabled;
    }

    public int getSocketBuffer() {
        return socketBuffer;
    }

    public void setSocketBuffer(int valueI) {
        socketBuffer = valueI;
    }

    public String getCompression() {
        return compression;
    }

    public void setCompression(String valueS) {
        compression = valueS;
        setAttribute("compression", valueS);
    }

    public int getMaxSavePostSize() {
        return maxSavePostSize;
    }

    public void setMaxSavePostSize(int valueI) {
        maxSavePostSize = valueI;
        setAttribute("maxSavePostSize", "" + valueI);
    }

    public int getMaxHttpHeaderSize() {
        return maxHttpHeaderSize;
    }

    public void setMaxHttpHeaderSize(int valueI) {
        maxHttpHeaderSize = valueI;
        setAttribute("maxHttpHeaderSize", "" + valueI);
    }

    public String getRestrictedUserAgents() {
        return restrictedUserAgents;
    }

    public void setRestrictedUserAgents(String valueS) {
        restrictedUserAgents = valueS;
        setAttribute("restrictedUserAgents", valueS);
    }

    public String getNoCompressionUserAgents() {
        return noCompressionUserAgents;
    }

    public void setNoCompressionUserAgents(String valueS) {
        noCompressionUserAgents = valueS;
        setAttribute("noCompressionUserAgents", valueS);
    }

    public String getCompressableMimeType() {
        return compressableMimeTypes;
    }

    public void setCompressableMimeType(String valueS) {
        compressableMimeTypes = valueS;
        setAttribute("compressableMimeTypes", valueS);
    }

    public int getCompressionMinSize() {
        return compressionMinSize;
    }

    public void setCompressionMinSize(int valueI) {
        compressionMinSize = valueI;
        setAttribute("compressionMinSize", "" + valueI);
    }

    public int getSoLinger() {
        return ep.getSoLinger();
    }

    public void setSoLinger( int i ) {
        ep.setSoLinger( i );
        setAttribute("soLinger", "" + i);
    }

    public int getSoTimeout() {
        return ep.getSoTimeout();
    }

    public void setSoTimeout( int i ) {
        ep.setSoTimeout(i);
        setAttribute("soTimeout", "" + i);
    }

    public int getServerSoTimeout() {
        return ep.getServerSoTimeout();
    }

    public void setServerSoTimeout( int i ) {
        ep.setServerSoTimeout(i);
        setAttribute("serverSoTimeout", "" + i);
    }

    public String getKeystore() {
        return getProperty("keystore");
    }

    public void setKeystore( String k ) {
        setAttribute("keystore", k);
    }

    public String getKeypass() {
        return getProperty("keypass");
    }

    public void setKeypass( String k ) {
        attributes.put("keypass", k);
        //setAttribute("keypass", k);
    }

    public String getKeytype() {
        return getProperty("keystoreType");
    }

    public void setKeytype( String k ) {
        setAttribute("keystoreType", k);
    }

    public String getClientauth() {
        return getProperty("clientauth");
    }

    public void setClientauth( String k ) {
        setAttribute("clientauth", k);
    }

    public String getProtocol() {
        return getProperty("protocol");
    }

    public void setProtocol( String k ) {
        setSecure(true);
        setAttribute("protocol", k);
    }

    public String getProtocols() {
        return getProperty("protocols");
    }

    public void setProtocols(String k) {
        setAttribute("protocols", k);
    }

    public String getAlgorithm() {
        return getProperty("algorithm");
    }

    public void setAlgorithm( String k ) {
        setAttribute("algorithm", k);
    }

    public boolean getSecure() {
        return secure;
    }

    public void setSecure( boolean b ) {
        secure=b;
        setAttribute("secure", "" + b);
    }

    public String getCiphers() {
        return getProperty("ciphers");
    }

    public void setCiphers(String ciphers) {
        setAttribute("ciphers", ciphers);
    }

    public String getKeyAlias() {
        return getProperty("keyAlias");
    }

    public void setKeyAlias(String keyAlias) {
        setAttribute("keyAlias", keyAlias);
    }

    public int getMaxKeepAliveRequests() {
        return maxKeepAliveRequests;
    }

    /** Set the maximum number of Keep-Alive requests that we will honor.
     */
    public void setMaxKeepAliveRequests(int mkar) {
        maxKeepAliveRequests = mkar;
        setAttribute("maxKeepAliveRequests", "" + mkar);
    }

    /**
     * Return the Keep-Alive policy for the connection.
     */
    public boolean getKeepAlive() {
        return ((maxKeepAliveRequests != 0) && (maxKeepAliveRequests != 1));
    }

    /**
     * Set the keep-alive policy for this connection.
     */
    public void setKeepAlive(boolean keepAlive) {
        if (!keepAlive) {
            setMaxKeepAliveRequests(1);
        }
    }

    public int getSocketCloseDelay() {
        return socketCloseDelay;
    }

    public void setSocketCloseDelay( int d ) {
        socketCloseDelay=d;
        setAttribute("socketCloseDelay", "" + d);
    }

    public void setServer( String server ) {
        this.server = server;
    }

    public String getServer() {
        return server;
    }


    private static ServerSocketFactory string2SocketFactory( String val)
    throws ClassNotFoundException, IllegalAccessException,
    InstantiationException
    {
        Class chC=Class.forName( val );
        return (ServerSocketFactory)chC.newInstance();
    }

    public int getTimeout() {
        return timeout;
    }

    public void setTimeout( int timeouts ) {
        timeout = timeouts;
        setAttribute("timeout", "" + timeouts);
    }

    public String getReportedname() {
        return reportedname;
    }

    public void setReportedname( String reportedName) {
        reportedname = reportedName;
    }

    // --------------------  Connection handler --------------------
    public static final int THREAD_DATA_PROCESSOR=1;
    public static final int THREAD_DATA_OBJECT_NAME=2;

    static class Http11ConnectionHandler implements TcpConnectionHandler {
        Http11BaseProtocol proto;
        static int count=0;
        RequestGroupInfo global=new RequestGroupInfo();

        Http11ConnectionHandler( Http11BaseProtocol proto ) {
            this.proto=proto;
        }

        public void setAttribute( String name, Object value ) {
        }

        public void setServer( Object o ) {
        }

        public Object[] init() {
            Object thData[]=new Object[3];

            Http11Processor  processor =
                new Http11Processor(proto.maxHttpHeaderSize);
            processor.setAdapter( proto.adapter );
            processor.setThreadPool( proto.tp );
            processor.setEndpoint( proto.ep );
            processor.setMaxKeepAliveRequests( proto.maxKeepAliveRequests );
            processor.setTimeout( proto.timeout );
            processor.setDisableUploadTimeout( proto.disableUploadTimeout );
            processor.setCompression( proto.compression );
            processor.setCompressionMinSize( proto.compressionMinSize);
            processor.setNoCompressionUserAgents( proto.noCompressionUserAgents);
            processor.setCompressableMimeTypes( proto.compressableMimeTypes);
            processor.setRestrictedUserAgents( proto.restrictedUserAgents);
            processor.setSocketBuffer( proto.socketBuffer );
            processor.setMaxSavePostSize( proto.maxSavePostSize );
            processor.setServer( proto.server );

            thData[Http11BaseProtocol.THREAD_DATA_PROCESSOR]=processor;

            return  thData;
        }

        public void processConnection(TcpConnection connection,
                      Object thData[]) {
            Socket socket=null;
            Http11Processor  processor=null;
            try {
                processor=(Http11Processor)thData[Http11BaseProtocol.THREAD_DATA_PROCESSOR];

                if (processor instanceof ActionHook) {
                    ((ActionHook) processor).action(ActionCode.ACTION_START, null);
                }
                socket=connection.getSocket();

                InputStream in = socket.getInputStream();
                OutputStream out = socket.getOutputStream();

                if( proto.secure ) {
                    SSLSupport sslSupport=null;
                    if(proto.sslImplementation != null)
                        sslSupport = proto.sslImplementation.getSSLSupport(socket);
                    processor.setSSLSupport(sslSupport);
                } else {
                    processor.setSSLSupport( null );
                }
                processor.setSocket( socket );

                processor.process(in, out);

                // If unread input arrives after the shutdownInput() call
                // below and before or during the socket.close(), an error
                // may be reported to the client.  To help troubleshoot this
                // type of error, provide a configurable delay to give the
                // unread input time to arrive so it can be successfully read
                // and discarded by shutdownInput().
                if( proto.socketCloseDelay >= 0 ) {
                    try {
                        Thread.sleep(proto.socketCloseDelay);
                    } catch (InterruptedException ie) { /* ignore */ }
                }

                TcpConnection.shutdownInput( socket );
            } catch(java.net.SocketException e) {
                // SocketExceptions are normal
                Http11BaseProtocol.log.debug
                    (sm.getString
                     ("http11protocol.proto.socketexception.debug"), e);
            } catch (IOException e) {
                // IOExceptions are normal
                Http11BaseProtocol.log.debug
                    (sm.getString
                     ("http11protocol.proto.ioexception.debug"), e);
            }
            // Future developers: if you discover any other
            // rare-but-nonfatal exceptions, catch them here, and log as
            // above.
            catch (Throwable e) {
                // any other exception or error is odd. Here we log it
                // with "ERROR" level, so it will show up even on
                // less-than-verbose logs.
                Http11BaseProtocol.log.error
                    (sm.getString("http11protocol.proto.error"), e);
            } finally {
                //       if(proto.adapter != null) proto.adapter.recycle();
                //                processor.recycle();

                if (processor instanceof ActionHook) {
                    ((ActionHook) processor).action(ActionCode.ACTION_STOP, null);
                }
                // recycle kernel sockets ASAP
                try { if (socket != null) socket.close (); }
                catch (IOException e) { /* ignore */ }
            }
        }
    }

    protected static org.apache.commons.logging.Log log
        = org.apache.commons.logging.LogFactory.getLog(Http11BaseProtocol.class);

    // -------------------- Various implementation classes --------------------

    /** Sanity check and socketFactory setup.
     *  IMHO it is better to stop the show on a broken connector,
     *  then leave Tomcat running and broken.
     *  @exception TomcatException Unable to resolve classes
     */
    private void checkSocketFactory() throws Exception {
        if (secure) {
            try {
                // The SSL setup code has been moved into
                // SSLImplementation since SocketFactory doesn't
                // provide a wide enough interface
                sslImplementation =
                    SSLImplementation.getInstance(sslImplementationName);
                socketFactory = sslImplementation.getServerSocketFactory();
                ep.setServerSocketFactory(socketFactory);
            } catch (ClassNotFoundException e){
                throw e;
            }
        } else if (socketFactoryName != null) {
            try {
                socketFactory = string2SocketFactory(socketFactoryName);
                ep.setServerSocketFactory(socketFactory);
            } catch(Exception sfex) {
                throw sfex;
            }
        }
    }

}