64 lines
2.2 KiB
Java
64 lines
2.2 KiB
Java
package lc.captchas;
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import java.awt.Font;
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import java.awt.Graphics2D;
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import java.awt.RenderingHints;
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import java.awt.Color;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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import javax.imageio.stream.ImageOutputStream;
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import javax.imageio.stream.MemoryCacheImageOutputStream;
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import java.io.ByteArrayOutputStream;
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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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import lc.misc.GifSequenceWriter;
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public class GifCaptcha implements ChallengeProvider {
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private BufferedImage charToImg(String text) {
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BufferedImage img = new BufferedImage(250, 100, BufferedImage.TYPE_INT_RGB);
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Font font = new Font("Bradley Hand", Font.ROMAN_BASELINE, 48);
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Graphics2D graphics2D = img.createGraphics();
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graphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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graphics2D.setRenderingHint(
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RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
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graphics2D.setFont(font);
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graphics2D.setColor(new Color((int) (Math.random() * 0x1000000)));
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graphics2D.drawString(text, 45, 45);
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graphics2D.dispose();
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return img;
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}
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private byte[] gifCaptcha(String text) {
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try {
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ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
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ImageOutputStream output = new MemoryCacheImageOutputStream(byteArrayOutputStream);
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GifSequenceWriter writer = new GifSequenceWriter(output, 1, 1000, true);
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for (int i = 0; i < text.length(); i++) {
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BufferedImage nextImage = charToImg(String.valueOf(text.charAt(i)));
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writer.writeToSequence(nextImage);
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}
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writer.close();
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output.close();
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return byteArrayOutputStream.toByteArray();
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} catch (IOException 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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public Challenge returnChallenge() {
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String secret = HelperFunctions.randomString(6);
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return new Challenge(gifCaptcha(secret), "image/gif", 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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public String getId() {
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return "GifCaptcha";
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}
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}
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