org.apache.myfaces.custom.captcha.CAPTCHAResource Maven / Gradle / Ivy

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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF2.0 features. A JSF2.0 implementation is required to use this version of the Tomahawk library.

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/*
 * 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.myfaces.custom.captcha;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Collections;
import java.util.Map;

import javax.faces.application.Resource;
import javax.faces.application.ResourceHandler;
import javax.faces.context.FacesContext;

import org.apache.myfaces.shared_tomahawk.resource.ResourceHandlerSupport;


public class CAPTCHAResource extends Resource
{

    private String _captchaSessionKeyName;
    private ResourceHandlerSupport _resourceHandlerSupport;
    
    public CAPTCHAResource(ResourceHandlerSupport support, String captchaSessionKeyName, String resourceName)
    {
        super();
        _resourceHandlerSupport = support;
        _captchaSessionKeyName = captchaSessionKeyName;
        setLibraryName(CAPTCHAResourceHandlerWrapper.CAPTCHA_LIBRARY);
        setResourceName(resourceName);
        setContentType("image/png");
    }

    @Override
    public InputStream getInputStream() throws IOException
    {
        // Return an InputStream forces buffer the image, and really it is not necessary.
        // so, we just use CAPTCHAResourceHandlerWrapper to intercept requests and render
        // the image there directly.
        return null;
    }
    
    static class WrappedByteArrayOutputStream extends ByteArrayOutputStream{
        
        public WrappedByteArrayOutputStream(){
            super();
        }
        
        public WrappedByteArrayOutputStream(int size){
            super(size);                
        }
        
        private byte[] getInnerArray(){
            return buf; 
        }
        
        private int getInnerCount(){
            return count;
        }
    }

    @Override
    public String getRequestPath()
    {
        String path;
        FacesContext facesContext = FacesContext.getCurrentInstance();

        if (_resourceHandlerSupport.isExtensionMapping())
        {
            path = ResourceHandler.RESOURCE_IDENTIFIER + '/' + 
                getResourceName() + _resourceHandlerSupport.getMapping();
        }
        else
        {
            String mapping = _resourceHandlerSupport.getMapping(); 
            path = ResourceHandler.RESOURCE_IDENTIFIER + '/' + getResourceName();
            path = (mapping == null) ? path : mapping + path;
        }
        path = path + "?ln=" + getLibraryName() + "&captchaSessionKeyName=" + _captchaSessionKeyName + "&dummyParameter=" + System.currentTimeMillis();

        return facesContext.getApplication().getViewHandler().getResourceURL(facesContext, path);
    }

    @Override
    public Map getResponseHeaders()
    {
        return Collections.emptyMap();
    }

    @Override
    public URL getURL()
    {
        // This is a generated resource, so it does not have an inner url, return null
        return null;
    }

    @Override
    public boolean userAgentNeedsUpdate(FacesContext context)
    {
        return true;
    }
}