webdavlistener.java

是离开的肌肤了卡机是离开的就富利卡及是了的开发及拉考试及的福利科技阿斯利康的肌肤莱卡及时的离开福建阿斯顿发

//========================================================================
//Copyright 2008 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//http://www.apache.org/licenses/LICENSE-2.0
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.
//========================================================================


package org.mortbay.jetty.client.webdav;

import java.io.IOException;

import javax.servlet.http.HttpServletResponse;

import org.mortbay.io.Buffer;
import org.mortbay.jetty.HttpMethods;
import org.mortbay.jetty.client.HttpDestination;
import org.mortbay.jetty.client.HttpEventListenerWrapper;
import org.mortbay.jetty.client.HttpExchange;
import org.mortbay.jetty.client.security.SecurityListener;
import org.mortbay.log.Log;
import org.mortbay.util.URIUtil;

/**
 * WebdavListener
 * 
 * 
 * 
 * 
 */
public class WebdavListener extends HttpEventListenerWrapper
{
    private HttpDestination _destination;
    private HttpExchange _exchange;
    private boolean _requestComplete;
    private boolean _responseComplete; 
    private boolean _webdavEnabled;
    private boolean _needIntercept;

    public WebdavListener(HttpDestination destination, HttpExchange ex)
    {
        // Start of sending events through to the wrapped listener
        // Next decision point is the onResponseStatus
        super(ex.getEventListener(),true);
        _destination=destination;
        _exchange=ex;

        // We'll only enable webdav if this is a PUT request
        if ( HttpMethods.PUT.equalsIgnoreCase( _exchange.getMethod() ) )
        {
            _webdavEnabled = true;
        }
    }

    public void onResponseStatus(Buffer version, int status, Buffer reason) throws IOException
    {
        if ( !_webdavEnabled )
        {
            _needIntercept = false;
            super.onResponseStatus(version, status, reason);
            return;
        }
        
        if (Log.isDebugEnabled())
            Log.debug("WebdavListener:Response Status: " + status );

        // The dav spec says that CONFLICT should be returned when the parent collection doesn't exist but I am seeing
        // FORBIDDEN returned instead so running with that.
        if ( status == HttpServletResponse.SC_CONFLICT || status == HttpServletResponse.SC_FORBIDDEN )
        {
            if ( _webdavEnabled )
            {
                if (Log.isDebugEnabled())
                    Log.debug("WebdavListener:Response Status: dav enabled, taking a stab at resolving put issue" );
                setDelegatingResponses( false ); // stop delegating, we can try and fix this request
                _needIntercept = true;
            }
            else
            {
                if (Log.isDebugEnabled())
                    Log.debug("WebdavListener:Response Status: Webdav Disabled" );
                setDelegatingResponses( true ); // just make sure we delegate
                setDelegatingRequests( true );
                _needIntercept = false;
            }
        }
        else
        {
            _needIntercept = false;
            setDelegatingResponses( true );
            setDelegatingRequests( true );
        }

        super.onResponseStatus(version, status, reason);
    }

    public void onResponseComplete() throws IOException
    {
        _responseComplete = true;
        if (_needIntercept)
        {
            if ( _requestComplete && _responseComplete)
            {
                try
                {
                    // we have some work to do before retrying this
                    if ( resolveCollectionIssues() )
                    {
                        setDelegatingRequests( true );
                        setDelegatingResponses(true);
                        _requestComplete = false;
                        _responseComplete = false;
                        _destination.resend(_exchange);
                    }
                    else
                    {
                        // admit defeat but retry because someone else might have 
                        setDelegatingRequests( true );
                        setDelegatingResponses(true);
                        super.onResponseComplete();
                    }
                }
                catch ( IOException ioe )
                {
                    Log.debug("WebdavListener:Complete:IOException: might not be dealing with dav server, delegate");
                    super.onResponseComplete();
                }
            }
            else
            {
                if (Log.isDebugEnabled())
                    Log.debug("WebdavListener:Not ready, calling super");
                super.onResponseComplete();
            }
        }
        else
        {
            super.onResponseComplete();
        }
    }

    
    
    public void onRequestComplete () throws IOException
    {
        _requestComplete = true;
        if (_needIntercept)
        {
            if ( _requestComplete && _responseComplete)
            {
                try
                {
                    // we have some work to do before retrying this
                    if ( resolveCollectionIssues() )
                    {
                        setDelegatingRequests( true );
                        setDelegatingResponses(true);
                        _requestComplete = false;
                        _responseComplete = false;
                        _destination.resend(_exchange);
                    }
                    else
                    {
                        // admit defeat but retry because someone else might have 
                        setDelegatingRequests( true );
                        setDelegatingResponses(true);
                        super.onRequestComplete();
                    }
                }
                catch ( IOException ioe )
                {
                    Log.debug("WebdavListener:Complete:IOException: might not be dealing with dav server, delegate");
                    super.onRequestComplete();
                }
            }
            else
            {
                if (Log.isDebugEnabled())
                    Log.debug("WebdavListener:Not ready, calling super");
                super.onRequestComplete();
            }
        }
        else
        {
            super.onRequestComplete();
        } 
    }

   
    
    
    /**
     * walk through the steps to try and resolve missing parent collection issues via webdav
     *
     * @return
     * @throws IOException
     */
    private boolean resolveCollectionIssues() throws IOException
    {

        String uri = _exchange.getURI();
        String[] uriCollection = _exchange.getURI().split("/");
        int checkNum = uriCollection.length;
        int rewind = 0;

        String parentUri = URIUtil.parentPath( uri );
        while ( !checkExists( parentUri ) )
        {
            ++rewind;
            parentUri = URIUtil.parentPath( parentUri );
        }

        // confirm webdav is supported for this collection
        if ( checkWebdavSupported() )
        {
            for (int i = 0; i < rewind;)
            {
                makeCollection(parentUri + "/" + uriCollection[checkNum - rewind - 1]);
                parentUri = parentUri + "/" + uriCollection[checkNum - rewind - 1];
                --rewind;
            }
        }
        else
        {
            return false;
        }

        return true;
    }

    private boolean checkExists( String uri ) throws IOException
    {
        PropfindExchange propfindExchange = new PropfindExchange();
        propfindExchange.setAddress( _exchange.getAddress() );
        propfindExchange.setMethod( HttpMethods.GET ); // PROPFIND acts wonky, just use get
        propfindExchange.setScheme( _exchange.getScheme() );
        propfindExchange.setEventListener( new SecurityListener( _destination, propfindExchange ) );
        propfindExchange.setConfigureListeners( false );
        propfindExchange.setURI( uri );

        _destination.send( propfindExchange );

        try
        {
            propfindExchange.waitForDone();

            return propfindExchange.exists();
        }
        catch ( InterruptedException ie )
        {
            Log.ignore( ie );                  
            return false;
        }
    }

    private boolean makeCollection( String uri ) throws IOException
    {
        MkcolExchange mkcolExchange = new MkcolExchange();
        mkcolExchange.setAddress( _exchange.getAddress() );
        mkcolExchange.setMethod( "MKCOL " + uri + " HTTP/1.1" );
        mkcolExchange.setScheme( _exchange.getScheme() );
        mkcolExchange.setEventListener( new SecurityListener( _destination, mkcolExchange ) );
        mkcolExchange.setConfigureListeners( false );
        mkcolExchange.setURI( uri );

        _destination.send( mkcolExchange );

        try
        {
            mkcolExchange.waitForDone();

            return mkcolExchange.exists();
        }
        catch ( InterruptedException ie )
        {
            Log.ignore( ie );
            return false;
        }
    }

    
    private boolean checkWebdavSupported() throws IOException
    {
        WebdavSupportedExchange supportedExchange = new WebdavSupportedExchange();
        supportedExchange.setAddress( _exchange.getAddress() );
        supportedExchange.setMethod( HttpMethods.OPTIONS );
        supportedExchange.setScheme( _exchange.getScheme() );
        supportedExchange.setEventListener( new SecurityListener( _destination, supportedExchange ) );
        supportedExchange.setConfigureListeners( false );
        supportedExchange.setURI( _exchange.getURI() );

        _destination.send( supportedExchange );

        try
        {
            supportedExchange.waitTilCompletion();
            return supportedExchange.isWebdavSupported();
        }
        catch (InterruptedException ie )
        {            
            Log.ignore( ie );
            return false;
        }

    }

}