kaptcha

maxkey-authentications/maxkey-authentication-captcha/src/main/java/com/google/code/kaptcha/impl/UniqueTextCreator.java

@@ -0,0 +1,27 @@
+package com.google.code.kaptcha.impl;
+
+import java.util.Random;
+
+import com.google.code.kaptcha.text.TextProducer;
+import com.google.code.kaptcha.util.Configurable;
+
+public class UniqueTextCreator  extends Configurable implements TextProducer{
+
+	@Override
+	public String getText() {
+		int length = getConfig().getTextProducerCharLength();
+		char[] chars = getConfig().getTextProducerCharString();
+		Random rand = new Random();
+		StringBuffer text = new StringBuffer();
+		int i = 0;
+		while ( i < length){
+			char word= chars[rand.nextInt(chars.length)];
+			if(text.indexOf(word + "") <= -1 ) {
+				text.append(word);
+				i++;
+			}
+		}
+		return text.toString();
+	}
+
+}