package org.jboss.seam.captcha;
import static org.jboss.seam.InterceptionType.NEVER;
import static org.jboss.seam.ScopeType.APPLICATION;
import static org.jboss.seam.annotations.Install.BUILT_IN;
import java.awt.image.BufferedImage;
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.Create;
import org.jboss.seam.annotations.Install;
import org.jboss.seam.annotations.Intercept;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.annotations.Startup;
import org.jboss.seam.contexts.Contexts;
import org.jboss.seam.contexts.Lifecycle;
import org.jboss.seam.servlet.AbstractResource;
import com.octo.captcha.service.CaptchaServiceException;
import com.octo.captcha.service.image.DefaultManageableImageCaptchaService;
import com.octo.captcha.service.image.ImageCaptchaService;
/**
* Provides Captcha image resources
*
* @author Shane Bryzak
*/
@Startup
@Scope(APPLICATION)
@Name("org.jboss.seam.captcha.captchaImage")
@Intercept(NEVER)
@Install(precedence = BUILT_IN,
classDependencies="com.octo.captcha.service.image.ImageCaptchaService")
public class CaptchaImage extends AbstractResource
{
private ImageCaptchaService service;
public static CaptchaImage instance()
{
if ( !Contexts.isApplicationContextActive() )
{
throw new IllegalStateException("No application context active");
}
return (CaptchaImage) Contexts.getApplicationContext().get(CaptchaImage.class);
}
public boolean validateResponse(String id, String response)
{
try
{
return service.validateResponseForID(id, response);
}
catch (CaptchaServiceException cse)
{
return false;
}
}
@Create
public void create()
{
service = new DefaultManageableImageCaptchaService();
}
@Override
protected String getResourcePath()
{
return "/captcha";
}
@Override
public void getResource(HttpServletRequest request, HttpServletResponse response)
throws IOException
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
try
{
Lifecycle.beginRequest( getServletContext(), request.getSession(), request );
String captchaId = request.getQueryString();
BufferedImage challenge = service.getImageChallengeForID( captchaId, request.getLocale() );
ImageIO.write(challenge, "jpeg", out);
}
catch (IllegalArgumentException e)
{
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
catch (CaptchaServiceException e)
{
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
finally
{
Lifecycle.endRequest();
}
response.setHeader("Cache-Control", "no-store");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/jpeg");
response.getOutputStream().write( out.toByteArray() );
response.getOutputStream().flush();
response.getOutputStream().close();
}
}