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package com.meterware.pseudoserver;
/********************************************************************************************************************
 * $Id: ReceivedHttpMessage.java 915 2008-04-14 19:39:44Z russgold $
 *
 * Copyright (c) 2003-2004, Russell Gold
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
 * to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
 * THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 *******************************************************************************************************************/

import java.util.Enumeration;
import java.util.Hashtable;
import java.io.*;

/**
 *
 * @author Russell Gold
 **/
abstract class ReceivedHttpMessage {

    private static final int CR = 13;
    private static final int LF = 10;
    private Reader         _reader;
    private Hashtable      _headers = new Hashtable();
    private byte[]         _requestBody;


    ReceivedHttpMessage( InputStream inputStream ) throws IOException {
        interpretMessageHeader( readHeaderLine( inputStream ) );
        readHeaders( inputStream );
        readMessageBody( inputStream );
    }


    public String toString() {
        StringBuffer sb = new StringBuffer( getClassName() ).append( "[ " );
        appendMessageHeader( sb );
        sb.append( "\n" );
        for (Enumeration e = _headers.keys(); e.hasMoreElements();) {
            Object key = e.nextElement();
            sb.append( "      " ).append( key ).append( ": " ).append( _headers.get( key ) ).append( "\n" );
        }
        sb.append( "   body contains " ).append( getBody().length ).append( " byte(s)]" );
        return sb.toString();
    }


    private String readHeaderLine( InputStream inputStream ) throws IOException {
        return new String( readDelimitedChunk( inputStream ) );
    }


    private byte[] readDelimitedChunk( InputStream inputStream ) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        int b = inputStream.read();
        while (b != CR) {
            baos.write( b );
            b = inputStream.read();
        }

        b = inputStream.read();
        if (b != LF) throw new IOException( "Bad header line termination: " + b );
        return baos.toByteArray();
    }


    void appendContents( StringBuffer sb ) {
        for (Enumeration e = _headers.keys(); e.hasMoreElements();) {
            Object key = e.nextElement();
            sb.append( "      " ).append( key ).append( ": " ).append( _headers.get( key ) ).append( "\n" );
        }
        sb.append( "   body contains " ).append( getBody().length ).append( " byte(s)" );
    }


    Reader getReader() {
        return _reader;
    }


    String getHeader( String name ) {
        return (String) _headers.get( name.toUpperCase() );
    }


    byte[] getBody() {
        return _requestBody;
    }


    private void readMessageBody( InputStream inputStream ) throws IOException {
        if ("chunked".equalsIgnoreCase( getHeader( "Transfer-Encoding" ) )) {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            while (getNextChunkLength( inputStream ) > 0) {
                baos.write( readDelimitedChunk( inputStream ) );
            }
            flushChunkTrailer( inputStream );
            _requestBody = baos.toByteArray();
        } else {
            int totalExpected = getContentLength();
            ByteArrayOutputStream baos = new ByteArrayOutputStream( totalExpected );
            byte[] buffer = new byte[1024];
            int total = 0;
            int count = -1;
            while ((total < totalExpected) && ((count = inputStream.read( buffer )) != -1)) {
                baos.write( buffer, 0, count );
                total += count;
            }
            baos.flush();
            _requestBody = baos.toByteArray();
        }
        _reader = new InputStreamReader( new ByteArrayInputStream( _requestBody ) );
    }


    private void flushChunkTrailer( InputStream inputStream ) throws IOException {
        byte[] line;
        do { line = readDelimitedChunk( inputStream ); } while (line.length > 0);
    }


    private int getNextChunkLength( InputStream inputStream ) throws IOException {
        try {
            return Integer.parseInt( readHeaderLine( inputStream ), 16 );
        } catch (NumberFormatException e) {
            throw new IOException( "Unabled to read chunk length: " + e );
        }
    }


    private int getContentLength() {
        try {
            return Integer.parseInt( getHeader( "Content-Length" ) );
        } catch (NumberFormatException e) {
            return 0;
        }
    }


    private void readHeaders( InputStream inputStream ) throws IOException {
        String lastHeader = null;

        String header = readHeaderLine( inputStream );
        while (header.length() > 0) {
    	    if (header.charAt(0) <= ' ') {
    	        if (lastHeader == null) continue;
    		    _headers.put( lastHeader, _headers.get( lastHeader ) + header.trim() );
    	    } else {
    	        lastHeader = header.substring( 0, header.indexOf(':') ).toUpperCase();
                _headers.put( lastHeader, header.substring( header.indexOf(':')+1 ).trim() );
    	    }
            header = readHeaderLine( inputStream );
        }
    }


    private String getClassName() {
        return getClass().getName().substring( getClass().getName().lastIndexOf( '.' )+1 );
    }


    abstract void appendMessageHeader( StringBuffer sb );


    abstract void interpretMessageHeader( String messageHeader );


}