package com.dl.common.captcha;
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import cn.hutool.captcha.generator.CodeGenerator;
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import cn.hutool.core.math.Calculator;
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import cn.hutool.core.util.CharUtil;
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import cn.hutool.core.util.RandomUtil;
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import com.dl.common.utils.StringUtils;
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/**
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* 无符号计算生成器
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*
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* @author Lion Li
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*/
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public class UnsignedMathGenerator implements CodeGenerator {
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private static final long serialVersionUID = -5514819971774091076L;
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private static final String OPERATORS = "+-*";
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/**
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* 参与计算数字最大长度
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*/
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private final int numberLength;
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/**
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* 构造
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*/
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public UnsignedMathGenerator() {
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this(2);
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}
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/**
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* 构造
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*
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* @param numberLength 参与计算最大数字位数
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*/
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public UnsignedMathGenerator(int numberLength) {
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this.numberLength = numberLength;
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}
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@Override
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public String generate() {
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final int limit = getLimit();
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int a = RandomUtil.randomInt(limit);
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int b = RandomUtil.randomInt(limit);
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String max = Integer.toString(Math.max(a,b));
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String min = Integer.toString(Math.min(a,b));
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max = StringUtils.rightPad(max, this.numberLength, CharUtil.SPACE);
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min = StringUtils.rightPad(min, this.numberLength, CharUtil.SPACE);
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return max + RandomUtil.randomChar(OPERATORS) + min + '=';
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}
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@Override
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public boolean verify(String code, String userInputCode) {
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int result;
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try {
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result = Integer.parseInt(userInputCode);
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} catch (NumberFormatException e) {
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// 用户输入非数字
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return false;
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}
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final int calculateResult = (int) Calculator.conversion(code);
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return result == calculateResult;
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}
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/**
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* 获取验证码长度
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*
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* @return 验证码长度
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*/
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public int getLength() {
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return this.numberLength * 2 + 2;
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}
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/**
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* 根据长度获取参与计算数字最大值
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*
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* @return 最大值
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*/
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private int getLimit() {
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return Integer.parseInt("1" + StringUtils.repeat('0', this.numberLength));
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}
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}
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