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package cn.hutool.captcha;

import cn.hutool.captcha.generator.CodeGenerator;
import cn.hutool.captcha.generator.RandomGenerator;
import cn.hutool.core.codec.Base64;
import cn.hutool.core.img.ImgUtil;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.IORuntimeException;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.URLUtil;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;

/**
 * 抽象验证码
* 抽象验证码实现了验证码字符串的生成、验证,验证码图片的写出
* 实现类通过实现{@link #createImage(String)} 方法生成图片对象 * * @author looly */ public abstract class AbstractCaptcha implements ICaptcha { private static final long serialVersionUID = 3180820918087507254L; /** * 图片的宽度 */ protected int width; /** * 图片的高度 */ protected int height; /** * 验证码干扰元素个数 */ protected int interfereCount; /** * 字体 */ protected Font font; /** * 验证码 */ protected String code; /** * 验证码图片 */ protected byte[] imageBytes; /** * 验证码生成器 */ protected CodeGenerator generator; /** * 背景色 */ protected Color background; /** * 文字透明度 */ protected AlphaComposite textAlpha; /** * 构造,使用随机验证码生成器生成验证码 * * @param width 图片宽 * @param height 图片高 * @param codeCount 字符个数 * @param interfereCount 验证码干扰元素个数 */ public AbstractCaptcha(int width, int height, int codeCount, int interfereCount) { this(width, height, new RandomGenerator(codeCount), interfereCount); } /** * 构造 * * @param width 图片宽 * @param height 图片高 * @param generator 验证码生成器 * @param interfereCount 验证码干扰元素个数 */ public AbstractCaptcha(int width, int height, CodeGenerator generator, int interfereCount) { this.width = width; this.height = height; this.generator = generator; this.interfereCount = interfereCount; // 字体高度设为验证码高度-2,留边距 this.font = new Font(Font.SANS_SERIF, Font.PLAIN, (int) (this.height * 0.75)); } @Override public void createCode() { generateCode(); final ByteArrayOutputStream out = new ByteArrayOutputStream(); ImgUtil.writePng(createImage(this.code), out); this.imageBytes = out.toByteArray(); } /** * 生成验证码字符串 * * @since 3.3.0 */ protected void generateCode() { this.code = generator.generate(); } /** * 根据生成的code创建验证码图片 * * @param code 验证码 * @return Image */ protected abstract Image createImage(String code); @Override public String getCode() { if (null == this.code) { createCode(); } return this.code; } @Override public boolean verify(String userInputCode) { return this.generator.verify(getCode(), userInputCode); } /** * 验证码写出到文件 * * @param path 文件路径 * @throws IORuntimeException IO异常 */ public void write(String path) throws IORuntimeException { this.write(FileUtil.touch(path)); } /** * 验证码写出到文件 * * @param file 文件 * @throws IORuntimeException IO异常 */ public void write(File file) throws IORuntimeException { try (OutputStream out = FileUtil.getOutputStream(file)) { this.write(out); } catch (IOException e) { throw new IORuntimeException(e); } } @Override public void write(OutputStream out) { IoUtil.write(out, false, getImageBytes()); } /** * 获取图形验证码图片bytes * * @return 图形验证码图片bytes * @since 4.5.17 */ public byte[] getImageBytes() { if (null == this.imageBytes) { createCode(); } return this.imageBytes; } /** * 获取验证码图 * * @return 验证码图 */ public BufferedImage getImage() { return ImgUtil.read(IoUtil.toStream(getImageBytes())); } /** * 获得图片的Base64形式 * * @return 图片的Base64 * @since 3.3.0 */ public String getImageBase64() { return Base64.encode(getImageBytes()); } /** * 获取图片带文件格式的 Base64 * * @return 图片带文件格式的 Base64 * @since 5.3.11 */ public String getImageBase64Data(){ return URLUtil.getDataUriBase64("image/png", getImageBase64()); } /** * 自定义字体 * * @param font 字体 */ public void setFont(Font font) { this.font = font; } /** * 获取验证码生成器 * * @return 验证码生成器 */ public CodeGenerator getGenerator() { return generator; } /** * 设置验证码生成器 * * @param generator 验证码生成器 */ public void setGenerator(CodeGenerator generator) { this.generator = generator; } /** * 设置背景色 * * @param background 背景色 * @since 4.1.22 */ public void setBackground(Color background) { this.background = background; } /** * 设置文字透明度 * * @param textAlpha 文字透明度,取值0~1,1表示不透明 * @since 4.5.17 */ public void setTextAlpha(float textAlpha) { this.textAlpha = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, textAlpha); } }




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