SpringBoot实现滑块验证码验证登陆校验功能详解

@Data
public class Captcha {
    
    private String nonceStr;
    
    private String value;
    
    private String canvasSrc;
    
    private Integer canvasWidth;
    
    private Integer canvasHeight;
    
    private String blockSrc;
    
    private Integer blockWidth;
    
    private Integer blockHeight;
    
    private Integer blockRadius;
    
    private Integer blockX;
    
    private Integer blockY;
    
    private Integer place;
}

public class CaptchaUtils {
    
    private final static String IMG_URL = "https://loyer.wang/view/ftp/wallpaper/%s.jpg";
    
    private final static String IMG_PATH = "E:/Temp/wallpaper/%s.jpg";
    
    public static void checkCaptcha(Captcha captcha) {
        //设置画布宽度默认值
        if (captcha.getCanvasWidth() == null) {
            captcha.setCanvasWidth(320);
        }
        //设置画布高度默认值
        if (captcha.getCanvasHeight() == null) {
            captcha.setCanvasHeight(155);
        }
        //设置阻塞块宽度默认值
        if (captcha.getBlockWidth() == null) {
            captcha.setBlockWidth(65);
        }
        //设置阻塞块高度默认值
        if (captcha.getBlockHeight() == null) {
            captcha.setBlockHeight(55);
        }
        //设置阻塞块凹凸半径默认值
        if (captcha.getBlockRadius() == null) {
            captcha.setBlockRadius(9);
        }
        //设置图片来源默认值
        if (captcha.getPlace() == null) {
            captcha.setPlace(0);
        }
    }
    
    public static int getNonceByRange(int start, int end) {
        Random random = new Random();
        return random.nextInt(end - start + 1) + start;
    }
    
    public static BufferedImage getBufferedImage(Integer place) {
        try {
            //随机图片
            int nonce = getNonceByRange(0, 1000);
            //获取网络资源图片
            if (0 == place) {
                String imgUrl = String.fORMat(IMG_URL, nonce);
                URL url = new URL(imgUrl);
                return Imageio.read(url.openStream());
            }
            //获取本地图片
            else {
                String imgPath = String.format(IMG_PATH, nonce);
                File file = new File(imgPath);
                return ImageIO.read(file);
            }
        } catch (Exception e) {
            System.out.println("获取拼图资源失败");
            //异常处理
            return null;
        }
    }
    
    public static BufferedImage imageResize(BufferedImage bufferedImage, int width, int height) {
        Image image = bufferedImage.getScaledInstance(width, height, Image.SCALE_SMOOTH);
        BufferedImage resultImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        Graphics2D graphics2D = resultImage.createGraphics();
        graphics2D.drawImage(image, 0, 0, null);
        graphics2D.dispose();
        return resultImage;
    }
    
    public static void cutByTemplate(BufferedImage canvasImage, BufferedImage blockImage, int blockWidth, int blockHeight, int blockRadius, int blockX, int blockY) {
        BufferedImage waterImage = new BufferedImage(blockWidth, blockHeight, BufferedImage.TYPE_4BYTE_ABGR);
        //阻塞块的轮廓图
        int[][] blockData = getBlockData(blockWidth, blockHeight, blockRadius);
        //创建阻塞块具体形状
        for (int i = 0; i < blockWidth; i++) {
            for (int j = 0; j < blockHeight; j++) {
                try {
                    //原图中对应位置变色处理
                    if (blockData[i][j] == 1) {
                        //背景设置为黑色
                        waterImage.setRGB(i, j, Color.BLACK.getRGB());
                        blockImage.setRGB(i, j, canvasImage.getRGB(blockX + i, blockY + j));
                        //轮廓设置为白色，取带像素和无像素的界点，判断该点是不是临界轮廓点
                        if (blockData[i + 1][j] == 0 || blockData[i][j + 1] == 0 || blockData[i - 1][j] == 0 || blockData[i][j - 1] == 0) {
                            blockImage.setRGB(i, j, Color.WHITE.getRGB());
                            waterImage.setRGB(i, j, Color.WHITE.getRGB());
                        }
                    }
                    //这里把背景设为透明
                    else {
                        blockImage.setRGB(i, j, Color.TRANSLUCENT);
                        waterImage.setRGB(i, j, Color.TRANSLUCENT);
                    }
                } catch (ArrayIndexOutOfBoundsException e) {
                    //防止数组下标越界异常
                }
            }
        }
        //在画布上添加阻塞块水印
        addBlockWatermark(canvasImage, waterImage, blockX, blockY);
    }
    
    private static int[][] getBlockData(int blockWidth, int blockHeight, int blockRadius) {
        int[][] data = new int[blockWidth][blockHeight];
        double po = Math.pow(blockRadius, 2);
        //随机生成两个圆的坐标，在4个方向上 随机找到2个方向添加凸/凹
        //凸/凹1
        int face1 = RandomUtils.nextInt(0,4);
        //凸/凹2
        int face2;
        //保证两个凸/凹不在同一位置
        do {
            face2 = RandomUtils.nextInt(0,4);
        } while (face1 == face2);
        //获取凸/凹起位置坐标
        int[] circle1 = getCircleCoords(face1, blockWidth, blockHeight, blockRadius);
        int[] circle2 = getCircleCoords(face2, blockWidth, blockHeight, blockRadius);
        //随机凸/凹类型
        int shape = getNonceByRange(0, 1);
        //圆的标准方程 (x-a)²+(y-b)²=r²,标识圆心（a,b）,半径为r的圆
        //计算需要的小图轮廓，用二维数组来表示，二维数组有两张值，0和1，其中0表示没有颜色，1有颜色
        for (int i = 0; i < blockWidth; i++) {
            for (int j = 0; j < blockHeight; j++) {
                data[i][j] = 0;
                //创建中间的方形区域
                if ((i >= blockRadius && i <= blockWidth - blockRadius && j >= blockRadius && j <= blockHeight - blockRadius)) {
                    data[i][j] = 1;
                }
                double d1 = Math.pow(i - Objects.requireNonNull(circle1)[0], 2) + Math.pow(j - circle1[1], 2);
                double d2 = Math.pow(i - Objects.requireNonNull(circle2)[0], 2) + Math.pow(j - circle2[1], 2);
                //创建两个凸/凹
                if (d1 <= po || d2 <= po) {
                    data[i][j] = shape;
                }
            }
        }
        return data;
    }
    
    private static int[] getCircleCoords(int face, int blockWidth, int blockHeight, int blockRadius) {
        //上
        if (0 == face) {
            return new int[]{blockWidth / 2 - 1, blockRadius};
        }
        //左
        else if (1 == face) {
            return new int[]{blockRadius, blockHeight / 2 - 1};
        }
        //下
        else if (2 == face) {
            return new int[]{blockWidth / 2 - 1, blockHeight - blockRadius - 1};
        }
        //右
        else if (3 == face) {
            return new int[]{blockWidth - blockRadius - 1, blockHeight / 2 - 1};
        }
        return null;
    }
    
    private static void addBlockWatermark(BufferedImage canvasImage, BufferedImage blockImage, int x, int y) {
        Graphics2D graphics2D = canvasImage.createGraphics();
        graphics2D.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.8f));
        graphics2D.drawImage(blockImage, x, y, null);
        graphics2D.dispose();
    }
    
    public static String toBase64(BufferedImage bufferedImage, String type) {
        try {
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            ImageIO.write(bufferedImage, type, byteArrayOutputStream);
            String base64 = Base64.getEncoder().encodeToString(byteArrayOutputStream.toByteArray());
            return String.format("data:image/%s;base64,%s", type, base64);
        } catch (IOException e) {
            System.out.println("图片资源转换BASE64失败");
            //异常处理
            return null;
        }
    }
}

@Service
public class CaptchaService {
    
    private static Integer ALLOW_DEVIATION = 3;
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    
    public String checkImageCode(String imageKey, String imageCode) {
        ValueOperations<String, String> ops = stringRedisTemplate.opsForValue();
        String text = ops.get("imageCode:" + imageKey);
        if(StrUtil.isBlank(text)){
            return "验证码已失效";
        }
        // 根据移动距离判断验证是否成功
        if (Math.abs(Integer.parseInt(text) - Integer.parseInt(imageCode)) > ALLOW_DEVIATION) {
            return "验证失败，请控制拼图对齐缺口";
        }
        return null;
    }
    
    public void saveImageCode(String key, String code) {
        ValueOperations<String, String> ops = stringRedisTemplate.opsForValue();
        ops.set("imageCode:" + key, code, 15, TimeUnit.MINUTES);
    }
    
    public Object getCaptcha(Captcha captcha) {
        //参数校验
        CaptchaUtils.checkCaptcha(captcha);
        //获取画布的宽高
        int canvasWidth = captcha.getCanvasWidth();
        int canvasHeight = captcha.getCanvasHeight();
        //获取阻塞块的宽高/半径
        int blockWidth = captcha.getBlockWidth();
        int blockHeight = captcha.getBlockHeight();
        int blockRadius = captcha.getBlockRadius();
        //获取资源图
        BufferedImage canvasImage = CaptchaUtils.getBufferedImage(captcha.getPlace());
        //调整原图到指定大小
        canvasImage = CaptchaUtils.imageResize(canvasImage, canvasWidth, canvasHeight);
        //随机生成阻塞块坐标
        int blockX = CaptchaUtils.getNonceByRange(blockWidth, canvasWidth - blockWidth - 10);
        int blockY = CaptchaUtils.getNonceByRange(10, canvasHeight - blockHeight + 1);
        //阻塞块
        BufferedImage blockImage = new BufferedImage(blockWidth, blockHeight, BufferedImage.TYPE_4BYTE_ABGR);
        //新建的图像根据轮廓图颜色赋值，源图生成遮罩
        CaptchaUtils.cutByTemplate(canvasImage, blockImage, blockWidth, blockHeight, blockRadius, blockX, blockY);
        // 移动横坐标
        String nonceStr = UUID.randomUUID().toString().replaceAll("-", "");
        // 缓存
        saveImageCode(nonceStr,String.valueOf(blockX));
        //设置返回参数
        captcha.setNonceStr(nonceStr);
        captcha.setBlockY(blockY);
        captcha.setBlockSrc(CaptchaUtils.toBase64(blockImage, "png"));
        captcha.setCanvasSrc(CaptchaUtils.toBase64(canvasImage, "png"));
        return captcha;
    }
}

@RestController
@RequestMapping("/captcha")
public class CaptchaController {
    @Autowired
    private CaptchaService captchaService;
    @apiOperation(value = "生成验证码拼图")
    @PostMapping("get-captcha")
    public R getCaptcha(@RequestBody Captcha captcha) {
        return R.ok(captchaService.getCaptcha(captcha));
    }
}

    @ApiOperation(value = "登录")
    @PostMapping(value = "login")
    public R login(@RequestBody LoginVo loginVo) {
        // 只有开启了验证码功能才需要验证
        if (needAuthCode) {
            String msg = captchaService.checkImageCode(loginVo.getNonceStr(),loginVo.getValue());
            if (StringUtils.isNotBlank(msg)) {
                return R.error(msg);
            }
        }
        String token = loginService.login(loginVo.getUserName(), loginVo.getPassWord());
        if (StringUtils.isBlank(token)) {
            return R.error("用户名或密码错误");
        }
        Map<String, String> tokenMap = new HashMap<>();
        tokenMap.put("token", token);
        tokenMap.put("tokenHead", tokenHead);
        return R.ok(tokenMap);
    }

<template>
    <div class="slide-verify" :style="{width: canvasWidth + 'px'}" onselectstart="return false;">
        <!-- 图片加载遮蔽罩 -->
        <div :class="{'img-loading': isLoading}" :style="{height: canvasHeight + 'px'}" v-if="isLoading"/>
        <!-- 认证成功后的文字提示 -->
        <div class="success-hint" :style="{height: canvasHeight + 'px'}" v-if="verifySuccess">{{ successhint }}</div>
        <!--刷新按钮-->
        <div class="refresh-icon" @click="refresh"/>
        <!--前端生成-->
        <template v-if="isFrontCheck">
            <!--验证图片-->
            <canvas ref="canvas" class="slide-canvas" :width="canvasWidth" :height="canvasHeight"/>
            <!--阻塞块-->
            <canvas ref="block" class="slide-block" :width="canvasWidth" :height="canvasHeight"/>
        </template>
        <!--后端生成-->
        <template v-else>
            <!--验证图片-->
            <img ref="canvas" class="slide-canvas" :width="canvasWidth" :height="canvasHeight"/>
            <!--阻塞块-->
            <img ref="block" :class="['slide-block', {'verify-fail': verifyFail}]"/>
        </template>
        <!-- 滑动条 -->
        <div class="slider" :class="{'verify-active': verifyActive, 'verify-success': verifySuccess, 'verify-fail': verifyFail}">
            <!--滑块-->
            <div class="slider-box" :style="{width: sliderBoxWidth}">
                <!-- 按钮 -->
                <div class="slider-button" id="slider-button" :style="{left: sliderButtonLeft}">
                    <!-- 按钮图标 -->
                    <div class="slider-button-icon"/>
                </div>
            </div>
            <!--滑动条提示文字-->
            <span class="slider-hint">{{ sliderHint }}</span>
        </div>
    </div>
</template>
<script>
function sum(x, y) {
    return x + y;
}
function square(x) {
    return x * x;
}
import { getCodeImg } from "@/api/login";
export default {
    name: 'sliderVerify',
    props: {
        // 阻塞块长度
        blockLength: {
            type: Number,
            default: 42,
        },
        // 阻塞块弧度
        blockRadius: {
            type: Number,
            default: 10,
        },
        // 画布宽度
        canvasWidth: {
            type: Number,
            default: 320,
        },
        // 画布高度
        canvasHeight: {
            type: Number,
            default: 155,
        },
        // 滑块操作提示
        sliderHint: {
            type: String,
            default: '向右滑动',
        },
        // 可允许的误差范围小；为1时，则表示滑块要与凹槽完全重叠，才能验证成功。默认值为5，若为 -1 则不进行机器判断
        accuracy: {
            type: Number,
            default: 3,
        },
        // 图片资源数组
        imageList: {
            type: Array,
            default: () => [],
        },
    },
    data() {
        return {
            // 前端校验
            isFrontCheck: false,
            // 校验进行状态
            verifyActive: false,
            // 校验成功状态
            verifySuccess: false,
            // 校验失败状态
            verifyFail: false,
            // 阻塞块对象
            blockObj: null,
            // 图片画布对象
            canvasCtx: null,
            // 阻塞块画布对象
            blockCtx: null,
            // 阻塞块宽度
            blockWidth: this.blockLength * 2,
            // 阻塞块的横轴坐标
            blockX: undefined,
            // 阻塞块的纵轴坐标
            blockY: undefined,
            // 图片对象
            image: undefined,
            // 移动的X轴坐标
            originX: undefined,
            // 移动的Y轴做坐标
            originY: undefined,
            // 拖动距离数组
            dragDistanceList: [],
            // 滑块箱拖动宽度
            sliderBoxWidth: 0,
            // 滑块按钮距离左侧起点位置
            sliderButtonLeft: 0,
            // 鼠标按下状态
            isMouseDown: false,
            // 图片加载提示，防止图片没加载完就开始验证
            isLoading: true,
            // 时间戳，计算滑动时长
            timestamp: null,
            // 成功提示
            successHint: '',
            // 随机字符串
            nonceStr: undefined,
        };
    },
    mounted() {
        this.init();
    },
    methods: {
        
        init() {
            this.initDom();
            this.bindEvents();
        },
        
        initDom() {
            this.blockObj = this.$refs.block;
            if (this.isFrontCheck) {
                this.canvasCtx = this.$refs.canvas.getContext('2d');
                this.blockCtx = this.blockObj.getContext('2d');
                this.initImage();
            } else {
                this.getCaptcha();
            }
        },
        
        getCaptcha() {
            let self = this;
            //取后端默认值
            const data = {};
          getCodeImg(data).then((response) => {
                const data = response.data;
                self.nonceStr = data.nonceStr;
                self.$refs.block.src = data.blockSrc;
                self.$refs.block.style.top = data.blockY + 'px';
                self.$refs.canvas.src = data.canvasSrc;
            }).finally(() => {
                self.isLoading = false;
            });
        },
        
        initImage() {
            const image = this.createImage(() => {
                this.drawBlock();
                let {canvasWidth, canvasHeight, blockX, blockY, blockRadius, blockWidth} = this;
                this.canvasCtx.drawImage(image, 0, 0, canvasWidth, canvasHeight);
                this.blockCtx.drawImage(image, 0, 0, canvasWidth, canvasHeight);
                // 将抠图防止最左边位置
                let yAxle = blockY - blockRadius * 2;
                let ImageData = this.blockCtx.getImageData(blockX, yAxle, blockWidth, blockWidth);
                this.blockObj.width = blockWidth;
                this.blockCtx.putImageData(ImageData, 0, yAxle);
                // 图片加载完关闭遮蔽罩
                this.isLoading = false;
                // 前端校验设置特殊值
                this.nonceStr = 'loyer';
            });
            this.image = image;
        },
        
        createImage(onload) {
            const image = document.createElement('img');
            image.crossOrigin = 'Anonymous';
            image.onload = onload;
            image.onerror = () => {
                image.src = require('../../assets/images/bgImg.jpg');
            };
            image.src = this.getImageSrc();
            return image;
        },
        
        getImageSrc() {
            const len = this.imageList.length;
            return len > 0 ? this.imageList[this.getNonceByRange(0, len)] : `Https://loyer.wang/view/ftp/wallpaper/${this.getNonceByRange(1, 1000)}.jpg`;
        },
        
        getNonceByRange(start, end) {
            return Math.round(Math.random() * (end - start) + start);
        },
        
        drawBlock() {
            this.blockX = this.getNonceByRange(this.blockWidth + 10, this.canvasWidth - (this.blockWidth + 10));
            this.blockY = this.getNonceByRange(10 + this.blockRadius * 2, this.canvasHeight - (this.blockWidth + 10));
            this.draw(this.canvasCtx, 'fill');
            this.draw(this.blockCtx, 'clip');
        },
        
        draw(ctx, operation) {
            const PI = Math.PI;
            let {blockX: x, blockY: y, blockLength: l, blockRadius: r} = this;
            // 绘制
            ctx.beginPath();
            ctx.moveTo(x, y);
            ctx.arc(x + l / 2, y - r + 2, r, 0.72 * PI, 2.26 * PI);
            ctx.lineTo(x + l, y);
            ctx.arc(x + l + r - 2, y + l / 2, r, 1.21 * PI, 2.78 * PI);
            ctx.lineTo(x + l, y + l);
            ctx.lineTo(x, y + l);
            ctx.arc(x + r - 2, y + l / 2, r + 0.4, 2.76 * PI, 1.24 * PI, true);
            ctx.lineTo(x, y);
            // 修饰
            ctx.lineWidth = 2;
            ctx.fillStyle = 'rgba(255, 255, 255, 0.9)';
            ctx.strokeStyle = 'rgba(255, 255, 255, 0.9)';
            ctx.stroke();
            ctx[operation]();
            ctx.globalCompositeOperation = 'destination-over';
        },
        
        bindEvents() {
            // 监听鼠标按下事件
            document.getElementById('slider-button').addEventListener('mousedown', (event) => {
                this.startEvent(event.clientX, event.clientY);
            });
            // 监听鼠标移动事件
            document.addEventListener('mousemove', (event) => {
                this.moveEvent(event.clientX, event.clientY);
            });
            // 监听鼠标离开事件
            document.addEventListener('mouseup', (event) => {
                this.endEvent(event.clientX);
            });
            // 监听触摸开始事件
            document.getElementById('slider-button').addEventListener('touchstart', (event) => {
                this.startEvent(event.changedTouches[0].pageX, event.changedTouches[0].pageY);
            });
            // 监听触摸滑动事件
            document.addEventListener('touchmove', (event) => {
                this.moveEvent(event.changedTouches[0].pageX, event.changedTouches[0].pageY);
            });
            // 监听触摸离开事件
            document.addEventListener('touchend', (event) => {
                this.endEvent(event.changedTouches[0].pageX);
            });
        },
        
        checkImgSrc() {
            if (this.isFrontCheck) {
                return true;
            }
            return !!this.$refs.canvas.src;
        },
        
        startEvent(originX, originY) {
            if (!this.checkImgSrc() || this.isLoading || this.verifySuccess) {
                return;
            }
            this.originX = originX;
            this.originY = originY;
            this.isMouseDown = true;
            this.timestamp = +new Date();
        },
        
        moveEvent(originX, originY) {
            if (!this.isMouseDown) {
                return false;
            }
            const moveX = originX - this.originX;
            const moveY = originY - this.originY;
            if (moveX < 0 || moveX + 40 >= this.canvasWidth) {
                return false;
            }
            this.sliderButtonLeft = moveX + 'px';
            let blockLeft = (this.canvasWidth - 40 - 20) / (this.canvasWidth - 40) * moveX;
            this.blockObj.style.left = blockLeft + 'px';
            this.verifyActive = true;
            this.sliderBoxWidth = moveX + 'px';
            this.dragDistanceList.push(moveY);
        },
        
        endEvent(originX) {
            if (!this.isMouseDown) {
                return false;
            }
            this.isMouseDown = false;
            if (originX === this.originX) {
                return false;
            }
            // 开始校验
            this.isLoading = true;
            // 校验结束
            this.verifyActive = false;
            // 滑动时长
            this.timestamp = +new Date() - this.timestamp;
            // 移动距离
            const moveLength = parseInt(this.blockObj.style.left);
            // 限制操作时长10S，超出判断失败
            if (this.timestamp > 10000) {
                this.verifyFailEvent();
            } else
                    // 人为操作判定
            if (!this.turingTest()) {
                this.verifyFail = true;
                this.$emit('again');
            } else
                    // 是否前端校验
            if (this.isFrontCheck) {
                const accuracy = this.accuracy <= 1 ? 1 : this.accuracy > 10 ? 10 : this.accuracy; // 容错精度值
                const spliced = Math.abs(moveLength - this.blockX) <= accuracy; // 判断是否重合
                if (!spliced) {
                    this.verifyFailEvent();
                } else {
                    // 设置特殊值，后台特殊处理，直接验证通过
                    this.$emit('success', {nonceStr: this.nonceStr, value: moveLength});
                }
            } else {
                this.$emit('success', {nonceStr: this.nonceStr, value: moveLength});
            }
        },
        
        turingTest() {
            const arr = this.dragDistanceList; // 拖动距离数组
            const average = arr.reduce(sum) / arr.length; // 平均值
            const deviations = arr.map((x) => x - average); // 偏离值
            const stdDev = Math.sqrt(deviations.map(square).reduce(sum) / arr.length); // 标准偏差
            return average !== stdDev; // 判断是否人为操作
        },
        
        verifySuccessEvent() {
            this.isLoading = false;
            this.verifySuccess = true;
            const elapsedTime = (this.timestamp / 1000).toFixed(1);
            if (elapsedTime < 1) {
                this.successHint = `仅仅${elapsedTime}S，你的速度快如闪电`;
            } else if (elapsedTime < 2) {
                this.successHint = `只用了${elapsedTime}S，这速度简直完美`;
            } else {
                this.successHint = `耗时${elapsedTime}S，争取下次再快一点`;
            }
        },
        
        verifyFailEvent(msg) {
            this.verifyFail = true;
            this.$emit('fail', msg);
            this.refresh();
        },
        
        refresh() {
            // 延迟class的删除，等待动画结束
            setTimeout(() => {
                this.verifyFail = false;
            }, 500);
            this.isLoading = true;
            this.verifyActive = false;
            this.verifySuccess = false;
            this.blockObj.style.left = 0;
            this.sliderBoxWidth = 0;
            this.sliderButtonLeft = 0;
            if (this.isFrontCheck) {
                // 刷新画布
                let {canvasWidth, canvasHeight} = this;
                this.canvasCtx.clearRect(0, 0, canvasWidth, canvasHeight);
                this.blockCtx.clearRect(0, 0, canvasWidth, canvasHeight);
                this.blockObj.width = canvasWidth;
                // 刷新图片
                this.image.src = this.getImageSrc();
            } else {
                this.getCaptcha();
            }
        },
    },
};
</script>
<style scoped>
    .slide-verify {
        position: relative;
    }
    
    .img-loading {
        position: absolute;
        top: 0;
        right: 0;
        left: 0;
        bottom: 0;
        z-index: 999;
        animation: loading 1.5s infinite;
        background-image: url(../../assets/images/loading.svg);
        background-repeat: no-repeat;
        background-position: center center;
        background-size: 100px;
        background-color: #737c8e;
        border-radius: 5px;
    }
    @keyframes loading {
        0% {
            opacity: .7;
        }
        100% {
            opacity: 9;
        }
    }
    
    .success-hint {
        position: absolute;
        top: 0;
        right: 0;
        left: 0;
        z-index: 999;
        display: flex;
        align-items: center;
        justify-content: center;
        background: rgba(255, 255, 255, 0.8);
        color: #2CD000;
        font-size: large;
    }
    
    .refresh-icon {
        position: absolute;
        right: 0;
        top: 0;
        width: 35px;
        height: 35px;
        cursor: pointer;
        background: url("../../assets/images/light.png") 0 -432px;
        background-size: 35px 470px;
    }
    
    .slide-canvas {
        border-radius: 5px;
    }
    
    .slide-block {
        position: absolute;
        left: 0;
        top: 0;
    }
    
    .slide-block.verify-fail {
        transition: left 0.5s linear;
    }
    
    .slider {
        position: relative;
        text-align: center;
        width: 100%;
        height: 40px;
        line-height: 40px;
        margin-top: 15px;
        background: #f7f9fa;
        color: #45494c;
        border: 1px solid #e4e7eb;
        border-radius: 5px;
    }
    
    .slider-box {
        position: absolute;
        left: 0;
        top: 0;
        height: 40px;
        border: 0 solid #1991FA;
        background: #D1E9FE;
        border-radius: 5px;
    }
    
    .slider-button {
        position: absolute;
        top: 0;
        left: 0;
        width: 40px;
        height: 40px;
        background: #fff;
        box-shadow: 0 0 3px rgba(0, 0, 0, 0.3);
        cursor: pointer;
        transition: background .2s linear;
        border-radius: 5px;
    }
    
    .slider-button:hover {
        background: #1991FA
    }
    
    .slider-button:hover .slider-button-icon {
        background-position: 0 -13px
    }
    
    .slider-button-icon {
        position: absolute;
        top: 15px;
        left: 13px;
        width: 15px;
        height: 13px;
        background: url("../../assets/images/light.png") 0 -26px;
        background-size: 35px 470px
    }
    
    .verify-active .slider-button {
        height: 38px;
        top: -1px;
        border: 1px solid #1991FA;
    }
    
    .verify-active .slider-box {
        height: 38px;
        border-width: 1px;
    }
    
    .verify-success .slider-box {
        height: 38px;
        border: 1px solid #52CCBA;
        background-color: #D2F4EF;
    }
    
    .verify-success .slider-button {
        height: 38px;
        top: -1px;
        border: 1px solid #52CCBA;
        background-color: #52CCBA !important;
    }
    
    .verify-success .slider-button-icon {
        background-position: 0 0 !important;
    }
    
    .verify-fail .slider-box {
        height: 38px;
        border: 1px solid #f57a7a;
        background-color: #fce1e1;
        transition: width 0.5s linear;
    }
    
    .verify-fail .slider-button {
        height: 38px;
        top: -1px;
        border: 1px solid #f57a7a;
        background-color: #f57a7a !important;
        transition: left 0.5s linear;
    }
    
    .verify-fail .slider-button-icon {
        top: 14px;
        background-position: 0 -82px !important;
    }
    
    .verify-active .slider-hint,
    .verify-success .slider-hint,
    .verify-fail .slider-hint {
        display: none;
    }
</style>

      <template>
  <div class="login-container">
    <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form" auto-complete="on" label-position="left">
      ...省略无关代码
      <!--滑块验证-->
      <el-dialog title="请拖动滑块完成拼图" width="360px" :visible.sync="isShowSliderVerify" :close-on-click-modal="false" @closed="refresh" append-to-body>
        <slider-verify ref="sliderVerify" @success="onSuccess" @fail="onFail" @again="onAgain"/>
      </el-dialog>
      <el-button :loading="loading" round style="width:100%;margin-bottom:30px;" @click.native.prevent="handleLogin">登录</el-button>
    </el-form>
  </div>
</template>
<script>
  import sliderVerify from './sliderVerify';
export default {
  name: 'Login',
  components: {
    sliderVerify,
  },
  data() {
    return {
      loginForm: {
        userName: '',
        passWord: '',
        // 随机字符串
        nonceStr: '',
        // 验证值
        value: '',
      },
      loading: false,
      // 是否显示滑块验证
      isShowSliderVerify: false,
    }
  },
  methods: {
    
    handleLogin() {
      let self = this;
      self.$refs.loginForm.validate((flag) => {
        self.isShowSliderVerify = flag;
      });
    },
    
    login() {
      let self = this;
      self.loading = true;
      self.$store.dispatch('user/login', self.loginForm).then(() => {
          self.$refs.sliderVerify.verifySuccessEvent();
          setTimeout(() => {
            self.isShowSliderVerify = false;
            self.message('success', '登录成功');
          }, 500);
          this.$router.push({ path: this.redirect || '/' })
      }).catch(() => {
        self.$refs.sliderVerify.verifyFailEvent();
      });
    },
    
    onSuccess(captcha) {
      Object.assign(this.loginForm, captcha);
      this.login();
    },
    
    onFail(msg) {
      //this.message('error', msg || '验证失败，请控制拼图对齐缺口');
    },
    
    onAgain() {
      this.message('error', '滑动操作异常，请重试');
    },
    
    refresh() {
      this.$refs.sliderVerify.refresh();
    },
    
    message(type, message) {
      this.$message({
        showClose: true,
        type: type,
        message: message,
        duration: 1500,
      });
    },
  },
}
</script>