package org.jboss.seam.captcha;
import static org.jboss.seam.ScopeType.APPLICATION;
import static org.jboss.seam.annotations.Install.BUILT_IN;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jboss.seam.annotations.Install;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.annotations.intercept.BypassInterceptors;
import org.jboss.seam.contexts.Contexts;
import org.jboss.seam.contexts.ServletLifecycle;
import org.jboss.seam.web.AbstractResource;
/**
* Serves CAPTCHA images
*
* @author Shane Bryzak
*/
@Scope(APPLICATION)
@Name("org.jboss.seam.captcha.captchaImage")
@BypassInterceptors
@Install(precedence = BUILT_IN)
public class CaptchaImage extends AbstractResource
{
public static CaptchaImage instance()
{
if ( !Contexts.isApplicationContextActive() )
{
throw new IllegalStateException("No application context active");
}
return (CaptchaImage) Contexts.getApplicationContext().get(CaptchaImage.class);
}
@Override
public String getResourcePath()
{
return "/captcha";
}
@Override
public void getResource(HttpServletRequest request, HttpServletResponse response)
throws IOException
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
ServletLifecycle.beginRequest(request,getServletContext());
try
{
ImageIO.write( Captcha.instance().renderChallenge(), "jpeg", out );
}
finally
{
ServletLifecycle.endRequest(request);
}
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
response.setHeader("Expires", "0");
response.setContentType("image/jpeg");
response.getOutputStream().write( out.toByteArray() );
response.getOutputStream().flush();
response.getOutputStream().close();
}
}