81 lines
2.6 KiB
Java
81 lines
2.6 KiB
Java
package lc.captchas;
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import javax.imageio.ImageIO;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.FilenameFilter;
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import lc.captchas.interfaces.Challenge;
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import lc.captchas.interfaces.ChallengeProvider;
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import lc.misc.HelperFunctions;
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public class FontFunCaptcha implements ChallengeProvider {
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public String getId() {
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return "FontFunCaptcha";
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}
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private String getFontName(String path, String level) {
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File file = new File(path + level + "/");
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FilenameFilter txtFileFilter =
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new FilenameFilter() {
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@Override
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public boolean accept(File dir, String name) {
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if (name.endsWith(".ttf")) return true;
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else return false;
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}
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};
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File[] files = file.listFiles(txtFileFilter);
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return path
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+ level.toLowerCase()
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+ "/"
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+ files[HelperFunctions.randomNumber(0, files.length - 1)].getName();
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}
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private Font loadCustomFont(String level, String path) {
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String fontName = getFontName(path, level);
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try {
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Font font = Font.createFont(Font.TRUETYPE_FONT, new File(fontName));
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font = font.deriveFont(Font.PLAIN, 48f);
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return font;
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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private byte[] fontFun(String captchaText, String level, String path) {
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String[] colors = {"#f68787", "#f8a978", "#f1eb9a", "#a4f6a5"};
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BufferedImage img = new BufferedImage(350, 100, BufferedImage.TYPE_INT_RGB);
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Graphics2D graphics2D = img.createGraphics();
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for (int i = 0; i < captchaText.length(); i++) {
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Font font = loadCustomFont(level, path);
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graphics2D.setFont(font);
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FontMetrics fontMetrics = graphics2D.getFontMetrics();
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HelperFunctions.setRenderingHints(graphics2D);
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graphics2D.setColor(Color.decode(colors[HelperFunctions.randomNumber(0, 3)]));
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graphics2D.drawString(
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String.valueOf(captchaText.charAt(i)), (i * 48), fontMetrics.getAscent());
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}
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graphics2D.dispose();
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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try {
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ImageIO.write(img, "png", baos);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return baos.toByteArray();
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}
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public Challenge returnChallenge() {
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String secret = HelperFunctions.randomString(7);
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String path = "./lib/fonts/";
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return new Challenge(fontFun(secret, "medium", path), "image/png", secret.toLowerCase());
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}
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public boolean checkAnswer(String secret, String answer) {
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return answer.toLowerCase().equals(secret);
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}
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}
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