package org.jboss.seam.wiki.core.captcha;
import org.jboss.seam.ScopeType;
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.captcha.Captcha;
import org.jboss.seam.log.Log;
import org.jboss.seam.log.Logging;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.Serializable;
/**
* Some code borrowed here: http://www.jroller.com/mlconnor/entry/simple_captcha_jsp
*
* @author Christian Bauer
*/
@Name("org.jboss.seam.captcha.captcha")
@Scope(ScopeType.SESSION)
@Install(precedence = Install.APPLICATION)
@BypassInterceptors
public class WikiCaptcha extends Captcha implements Serializable {
Log log = Logging.getLog(WikiCaptcha.class);
Color backgroundColor = new Color(0xf5, 0xf5, 0xf5);
Font textFont = new Font("Arial", Font.PLAIN, 25);
int charsToPrint = 6;
int width = 120;
int height = 25;
int circlesToDraw = 4;
float horizMargin = 20.0f;
double rotationRange = 0.2;
String elegibleChars = "ABDEFGHJKLMRSTUVWXYabdefhkmnrstuvwx245679";
char[] chars = elegibleChars.toCharArray();
@Override
public void init() {
StringBuffer challengeString = new StringBuffer();
for (int i = 0; i < charsToPrint; i++) {
double randomValue = Math.random();
int randomIndex = (int) Math.round(randomValue * (chars.length - 1));
char characterToShow = chars[randomIndex];
challengeString.append(characterToShow);
}
setChallenge(challengeString.toString());
log.debug("setting captcha challenge: " + getChallenge());
}
@Override
public BufferedImage renderChallenge() {
// Background
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = (Graphics2D) bufferedImage.getGraphics();
g.setColor(backgroundColor);
g.fillRect(0, 0, width, height);
// Some obfuscation circles
for (int i = 0; i < circlesToDraw; i++) {
int circleColor = 80 + (int) (Math.random() * 70);
float circleLinewidth = 0.3f + (float) (Math.random());
g.setColor(new Color(circleColor, circleColor, circleColor));
g.setStroke(new BasicStroke(circleLinewidth));
int circleRadius = (int) (Math.random() * height / 2.0);
int circleX = (int) (Math.random() * width - circleRadius);
int circleY = (int) (Math.random() * height - circleRadius);
g.drawOval(circleX, circleY, circleRadius * 2, circleRadius * 2);
}
// Text
g.setFont(textFont);
FontMetrics fontMetrics = g.getFontMetrics();
int maxAdvance = fontMetrics.getMaxAdvance();
int fontHeight = fontMetrics.getHeight();
float spaceForLetters = -horizMargin * 2 + width;
float spacePerChar = spaceForLetters / (charsToPrint - 1.0f);
char[] allChars = getChallenge().toCharArray();
for (int i = 0; i < allChars.length; i++) {
char charToPrint = allChars[i];
int charWidth = fontMetrics.charWidth(charToPrint);
int charDim = Math.max(maxAdvance, fontHeight);
int halfCharDim = (charDim / 2);
BufferedImage charImage = new BufferedImage(charDim, charDim, BufferedImage.TYPE_INT_ARGB);
Graphics2D charGraphics = charImage.createGraphics();
charGraphics.translate(halfCharDim, halfCharDim);
double angle = (Math.random() - 0.5) * rotationRange;
charGraphics.transform(AffineTransform.getRotateInstance(angle));
charGraphics.translate(-halfCharDim, -halfCharDim);
int charColor = 60 + (int) (Math.random() * 90);
charGraphics.setColor(new Color(charColor, charColor, charColor));
charGraphics.setFont(textFont);
int charX = (int) (0.5 * charDim - 0.5 * charWidth);
charGraphics.drawString("" + charToPrint, charX, ((charDim - fontMetrics.getAscent()) / 2 + fontMetrics.getAscent()));
float x = horizMargin + spacePerChar * (i) - charDim / 2.0f;
int y = ((height - charDim) / 2);
g.drawImage(charImage, (int) x, y, charDim, charDim, null, null);
charGraphics.dispose();
}
g.dispose();
return bufferedImage;
}
@Override
// Remove this: @CaptchaResponse so we can use our own validator, even if someone by accident uses s:validate/All
public String getResponse() {
return super.getResponse();
}
public String getProtectedChallenge() {
return getChallenge();
}
}