brokerframe.java

很棒的web服务器源代码

// BrokerFrame.java
// $Id: BrokerFrame.java,v 1.11 2000/08/16 21:37:33 ylafon Exp $
// (c) COPYRIGHT MIT and INRIA, 1997.
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.jigsaw.admin;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import java.util.Hashtable;
import java.util.StringTokenizer;

import java.util.zip.GZIPInputStream;

import org.w3c.jigsaw.daemon.ServerHandler;
import org.w3c.jigsaw.daemon.ServerHandlerManager;

import org.w3c.tools.resources.AttributeHolder;
import org.w3c.tools.resources.ContainerInterface;
import org.w3c.tools.resources.DirectoryResource;
import org.w3c.tools.resources.FramedResource;
import org.w3c.tools.resources.InvalidResourceException;
import org.w3c.tools.resources.LookupResult;
import org.w3c.tools.resources.LookupState;
import org.w3c.tools.resources.MultipleLockException;
import org.w3c.tools.resources.ProtocolException;
import org.w3c.tools.resources.Resource;
import org.w3c.tools.resources.ResourceException;
import org.w3c.tools.resources.ResourceFrame;
import org.w3c.tools.resources.ResourceReference;

import org.w3c.www.mime.MimeType;

import org.w3c.www.http.HTTP;
import org.w3c.www.http.HttpEntityMessage;
import org.w3c.www.http.HttpMessage;
import org.w3c.www.http.HttpRequestMessage;

import org.w3c.jigsaw.http.Client;
import org.w3c.jigsaw.http.HTTPException;
import org.w3c.jigsaw.http.Reply;
import org.w3c.jigsaw.http.Request;

import org.w3c.jigsaw.frames.HTTPFrame;

import org.w3c.tools.resources.ProtocolException;
import org.w3c.tools.resources.ResourceException;
import org.w3c.tools.resources.serialization.ResourceDescription;
import org.w3c.tools.resources.serialization.AttributeDescription;

public class BrokerFrame extends HTTPFrame {

    class LookupFrameState {
	private int     index ;
	private String  components[] ;

	void parseQuery(String query) {
	    StringTokenizer st = new StringTokenizer(query, "?");
	    int nbTokens = st.countTokens();
	    components = new String[nbTokens];
	    for (int i = 0 ; i < nbTokens ; i++)
		components[i] = st.nextToken();
	    index = 0;
	}

	public boolean hasMoreComponents() {
	    return index < components.length ;
	}

	public final String getNextComponent() {
	    return components[index++] ;
	}

	LookupFrameState (String query) {
	    parseQuery(query);
	}
    }

    protected ResourceBroker broker = null;

    public void registerResource(FramedResource resource) {
	super.registerResource(resource);
	if (resource instanceof ResourceBroker)
	    broker = (ResourceBroker) resource;
    }

 
    /**
     * The object that knows how to write the admin protocol.
     */
    protected AdminWriter writer = null;

    /**
     * The ServerHandlerManager we export.
     */
    protected ServerHandlerManager shm = null;
    /**
     * The controlling ServerHandler.
     */
    protected AdminServer admin = null;

    /**
     * Trigger an HTTP exception.
     * @param request The request we couldn't fulfill.
     * @param msg The error message.
     * @exception ProtocolException Always thrown.
     */

    protected void error(Request request, String msg) 
	throws ProtocolException
    {
	Reply reply = request.makeReply(HTTP.INTERNAL_SERVER_ERROR);
	reply.setContent(msg);
	throw new HTTPException(reply);
    }

    protected Reply okReply(Request request, byte bits[]) {
	Reply reply = request.makeReply(HTTP.OK);
	reply.setContentType(AdminContext.conftype);
	if ( bits != null ) {
	    ByteArrayInputStream in = new ByteArrayInputStream(bits);
	    reply.setContentLength(bits.length);
	    reply.setStream(in);
	}
	return reply;
    }

    protected Reply okReply(Request request) {
	return okReply(request, null);
    }

    /**
     * Check that request incomming content type.
     * @param request The request to check.
     * @exception ProtocolException If the request type doesn't match admin.
     */

    protected void checkContentType(Request request) 
	throws ProtocolException
    {
	if ( request.getContentType().match(AdminContext.conftype) < 0 ) 
	    error(request, "invalid MIME type: "+request.getContentType());
    }

    /**
     * Get a data input stream out of that request input stream
     * @param request The request to get data from.
     * @exception ProtocolException If we couldn't get the request's content.
     * @return A DataInputStream instance to read the request's content.
     */

    protected InputStream getInputStream(Request request) 
	throws ProtocolException
    {
	// How fun HTTP/1.1 is, allowing us to double the network traffic :-(
	// If this is a 1.1 request, send a 100 continue:
	Client client = request.getClient();
	if ( client != null ) {
	    try {
		client.sendContinue();
	    } catch (IOException ex) {
		throw new HTTPException(ex.getMessage());
	    }
	}
	// Now, only, get the data:
	try {
	    if (request.hasTransferEncoding("gzip"))
		return new GZIPInputStream(request.getInputStream());
	    else
		return request.getInputStream();
	} catch (IOException ex) {
	    error(request, "invalid request");
	}
	// not reached:
	return null;
    }

    /**
     * Lookup the target of the given request.
     * @param request The request whose target is to be fetched.
     * @return A Resource instance.
     * @exception ProtocolException If the resource couldn't be located.
     */

    public ResourceReference lookup(Request request) 
	throws ProtocolException
    {
	// Create lookup state and get rid of root resource requests:
	LookupState   ls = null;
	try {
	    ls = new LookupState(request);
	} catch (org.w3c.tools.resources.ProtocolException ex) {
	    ex.printStackTrace();
	    throw new HTTPException(ex);
	}
	LookupResult  lr = new LookupResult(null);
	ResourceReference rr = null; // cr
	ls.markInternal();
	if ( ! ls.hasMoreComponents() ) 
	    return admin.getRootReference();
	// Lookup the target resource:
	String name = ls.getNextComponent();
	ServerHandler sh = shm.lookupServerHandler(name);
	if ( sh == null ) {
	    if(name.equals("realms")) {
		rr = admin.getRealmCatalogResource();
	    } else if (name.equals("control")) {
		rr = admin.getControlResource();
	    } else {
		error(request, "unknown server handler");
	    }
	} else {
	    // Lookup that resource, from the config resource of that server:
	    rr = sh.getConfigResource();
	}
	if ( rr != null ) {
	    ResourceReference rr_temp = null;
	    while ( ls.hasMoreComponents() ) {
		try {
		    if (rr == null)
			error(request, "url too long");
		    Resource r = rr.lock();
		    if ( ! ( r instanceof ContainerInterface) )
			error(request, "url too long");
		    rr_temp = ((ContainerInterface) r).lookup(
						       ls.getNextComponent());
		} catch (InvalidResourceException ex) {
		    error(request, "unable to restore resource");
		} finally {
		    rr.unlock();
		    rr = rr_temp;
		}
	    }
	    if ( rr == null )
		error(request, "unknown resource");
	    String query = request.getQueryString();
	    if ( query != null ) {
		try {
		    Resource r = rr.lock();
		    // Querying a frame !
		    if ( ! (r instanceof FramedResource) )
			error(request, "not a framed resource");
		} catch (InvalidResourceException ex) {
		    error(request, "unable to restore resource");
		} finally {
		    rr.unlock();
		}

		//search the right frame
		LookupFrameState lfs = new LookupFrameState(query);
	
		String frameName = null;
		ResourceReference the_rrf   = rr; 
		ResourceReference[] rra = null;	  

		while (lfs.hasMoreComponents()) {

		    try {
			rra = ((FramedResource) 
			       the_rrf.lock()).getFramesReference();
			if (rra == null)
			    error(request, "unknown frame");
		    } catch (InvalidResourceException ex) {
			error(request, ex.getMessage());
		    } finally {
			the_rrf.unlock();
		    }
		    the_rrf = null;
		    frameName = lfs.getNextComponent();
		    ResourceReference rrf   = null; 
		    ResourceFrame     frame = null;

		    for (int i = 0 ; i < rra.length ; i++) {
			rrf = rra[i];
			try {
			    frame = (ResourceFrame) rrf.lock();
			    if (frame.getIdentifier().equals(frameName)) {
				the_rrf = rrf;
				break;
			    }
			} catch (InvalidResourceException ex) {
			    error(request, ex.getMessage());
			} finally {
			    rrf.unlock();
			}
		    }
		    if (the_rrf == null)
			error(request,"unknown frame");
		}
	
		return the_rrf;
	    } else {
		// Emit back this resource (after a check):
		return rr;
	    }
	}
	error(request, "unknown resource");
	// not reached
	return null;
    }

    /**
     * Set a set of attribute values for the target resource.
     * @param request The request to handle.
     * @return A Reply instance.
     * @exception ProtocolException If some error occurs.
     */

    public Reply remoteSetValues(Request request)