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each challenge provider now respects the size parameter when construction image

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This commit is contained in:
hrj 2022-03-01 23:03:43 +05:30
parent edd211fb52
commit 4f3bec0bc6
7 changed files with 43 additions and 21 deletions
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9
src/main/java/lc/captchas/FontFunCaptcha.java
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@ -58,9 +58,9 @@ public class FontFunCaptcha implements ChallengeProvider {
return null;
}
private byte[] fontFun(String captchaText, String level, String path) {
private byte[] fontFun(final int width, final int height, String captchaText, String level, String path) {
String[] colors = {"#f68787", "#f8a978", "#f1eb9a", "#a4f6a5"};
BufferedImage img = new BufferedImage(350, 100, BufferedImage.TYPE_INT_RGB);
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = img.createGraphics();
for (int i = 0; i < captchaText.length(); i++) {
Font font = loadCustomFont(level, path);
@ -83,8 +83,11 @@ public class FontFunCaptcha implements ChallengeProvider {
public Challenge returnChallenge(String level, String size) {
String secret = HelperFunctions.randomString(7);
final int[] size2D = HelperFunctions.parseSize2D(size);
final int width = size2D[0];
final int height = size2D[1];
String path = "./lib/fonts/";
return new Challenge(fontFun(secret, "medium", path), "image/png", secret.toLowerCase());
return new Challenge(fontFun(width, height, secret, "medium", path), "image/png", secret.toLowerCase());
}
public boolean checkAnswer(String secret, String answer) {

17
src/main/java/lc/captchas/PoppingCharactersCaptcha.java
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@ -21,10 +21,8 @@ import lc.misc.GifSequenceWriter;
public class PoppingCharactersCaptcha implements ChallengeProvider {
private final Font font = new Font("Arial", Font.ROMAN_BASELINE, 48);
private final int width = 250;
private final int height = 100;
private Integer[] computeOffsets(final String text) {
private Integer[] computeOffsets(final int width, final int height, final String text) {
final var img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
final var graphics2D = img.createGraphics();
final var frc = graphics2D.getFontRenderContext();
@ -41,7 +39,7 @@ public class PoppingCharactersCaptcha implements ChallengeProvider {
return advances.toArray(new Integer[]{});
}
private BufferedImage makeImage(final Consumer<Graphics2D> f) {
private BufferedImage makeImage(final int width, final int height, final Consumer<Graphics2D> f) {
final var img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
final var graphics2D = img.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
@ -56,16 +54,16 @@ public class PoppingCharactersCaptcha implements ChallengeProvider {
return HelperFunctions.randomNumber(-2, +2);
}
private byte[] gifCaptcha(final String text) {
private byte[] gifCaptcha(final int width, final int height, final String text) {
try {
final var byteArrayOutputStream = new ByteArrayOutputStream();
final var output = new MemoryCacheImageOutputStream(byteArrayOutputStream);
final var writer = new GifSequenceWriter(output, 1, 900, true);
final var advances = computeOffsets(text);
final var advances = computeOffsets(width, height, text);
final var prevColor = Color.getHSBColor(0f, 0f, 0.1f);
IntStream.range(0, text.length()).forEach(i -> {
final var color = Color.getHSBColor(HelperFunctions.randomNumber(0, 100)/100.0f, 0.6f, 1.0f);
final var nextImage = makeImage((g) -> {
final var nextImage = makeImage(width, height, (g) -> {
if (i > 0) {
final var prevI = (i - 1) % text.length();
g.setColor(prevColor);
@ -102,7 +100,10 @@ public class PoppingCharactersCaptcha implements ChallengeProvider {
public Challenge returnChallenge(String level, String size) {
final var secret = HelperFunctions.randomString(6);
return new Challenge(gifCaptcha(secret), "image/gif", secret.toLowerCase());
final int[] size2D = HelperFunctions.parseSize2D(size);
final int width = size2D[0];
final int height = size2D[1];
return new Challenge(gifCaptcha(width, height, secret), "image/gif", secret.toLowerCase());
}
public boolean checkAnswer(String secret, String answer) {

9
src/main/java/lc/captchas/ShadowTextCaptcha.java
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@ -38,8 +38,8 @@ public class ShadowTextCaptcha implements ChallengeProvider {
return answer.toLowerCase().equals(secret);
}
private byte[] shadowText(String text) {
BufferedImage img = new BufferedImage(350, 100, BufferedImage.TYPE_INT_RGB);
private byte[] shadowText(final int width, final int height, String text) {
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Font font = new Font("Arial", Font.ROMAN_BASELINE, 48);
Graphics2D graphics2D = img.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
@ -76,6 +76,9 @@ public class ShadowTextCaptcha implements ChallengeProvider {
public Challenge returnChallenge(String level, String size) {
String secret = HelperFunctions.randomString(6);
return new Challenge(shadowText(secret), "image/png", secret.toLowerCase());
final int[] size2D = HelperFunctions.parseSize2D(size);
final int width = size2D[0];
final int height = size2D[1];
return new Challenge(shadowText(width, height, secret), "image/png", secret.toLowerCase());
}
}

6
src/main/java/lc/misc/HelperFunctions.java
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@ -11,6 +11,12 @@ public class HelperFunctions {
random.setSeed(seed);
}
public static int[] parseSize2D(final String size) {
final String[] fields = size.split("x");
final int[] result = {Integer.parseInt(fields[0]), Integer.parseInt(fields[1])};
return result;
}
public static void setRenderingHints(Graphics2D g2d) {
g2d.setRenderingHint(
RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

11
src/main/scala/lc/captchas/DebugCaptcha.scala
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@ -45,14 +45,14 @@ class DebugCaptcha extends ChallengeProvider {
matches
}
private def simpleText(text: String): Array[Byte] = {
val img = new BufferedImage(350, 100, BufferedImage.TYPE_INT_RGB)
private def simpleText(width: Int, height: Int, text: String): Array[Byte] = {
val img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB)
val font = new Font("Arial", Font.ROMAN_BASELINE, 56)
val graphics2D = img.createGraphics()
val textLayout = new TextLayout(text, font, graphics2D.getFontRenderContext())
HelperFunctions.setRenderingHints(graphics2D)
graphics2D.setPaint(Color.WHITE)
graphics2D.fillRect(0, 0, 350, 100)
graphics2D.fillRect(0, 0, width, height)
graphics2D.setPaint(Color.BLACK)
textLayout.draw(graphics2D, 15, 50)
graphics2D.dispose()
@ -68,6 +68,9 @@ class DebugCaptcha extends ChallengeProvider {
def returnChallenge(level: String, size: String): Challenge = {
val secret = HelperFunctions.randomString(6, HelperFunctions.safeAlphabets)
new Challenge(simpleText(secret), "image/png", secret.toLowerCase())
val size2D = HelperFunctions.parseSize2D(size)
val width = size2D(0)
val height = size2D(1)
new Challenge(simpleText(width, height, secret), "image/png", secret.toLowerCase())
}
}

6
src/main/scala/lc/captchas/FilterChallenge.scala
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@ -10,6 +10,7 @@ import lc.captchas.interfaces.Challenge
import java.util.{List => JavaList, Map => JavaMap}
import java.io.ByteArrayOutputStream
import lc.misc.PngImageWriter
import lc.misc.HelperFunctions
class FilterChallenge extends ChallengeProvider {
def getId = "FilterChallenge"
@ -35,7 +36,10 @@ class FilterChallenge extends ChallengeProvider {
val alphabet = "abcdefghijklmnopqrstuvwxyz"
val n = 8
val secret = LazyList.continually(r.nextInt(alphabet.size)).map(alphabet).take(n).mkString
val canvas = new BufferedImage(225, 50, BufferedImage.TYPE_INT_RGB)
val size2D = HelperFunctions.parseSize2D(size)
val width = size2D(0)
val height = size2D(1)
val canvas = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB)
val g = canvas.createGraphics()
g.setColor(Color.WHITE)
g.fillRect(0, 0, canvas.getWidth, canvas.getHeight)

6
src/main/scala/lc/captchas/RainDropsCaptcha.scala
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@ -11,6 +11,7 @@ import lc.captchas.interfaces.ChallengeProvider
import lc.captchas.interfaces.Challenge
import lc.misc.GifSequenceWriter
import java.util.{List => JavaList, Map => JavaMap}
import lc.misc.HelperFunctions
class Drop {
var x = 0
@ -59,8 +60,9 @@ class RainDropsCP extends ChallengeProvider {
def returnChallenge(level: String, size: String): Challenge = {
val r = new scala.util.Random
val secret = LazyList.continually(r.nextInt(alphabet.size)).map(alphabet).take(n).mkString
val width = 450
val height = 100
val size2D = HelperFunctions.parseSize2D(size)
val width = size2D(0)
val height = size2D(1)
val imgType = BufferedImage.TYPE_INT_RGB
val xOffset = 2 + r.nextInt(3)
val xBias = (height / 10) - 2