.NET如何实现滑动验证码

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CaptchaData.cs

CaptchaData.cs：验证码的数据类实体

namespace SlideCaptcha.Model{    public class CaptchaData    {        /// <summary>        /// id        /// </summary>        public string Id { get; set; }        /// <summary>        /// 背景图(含凹槽)        /// </summary>        public string BackgroundImage { get; set; }        /// <summary>        /// 滑动块图        /// </summary>        public string SliderImage { get; set; }        public CaptchaData(string id, string backgroundImage, string sliderImage)        {            Id = id;            BackgroundImage = backgroundImage;            SliderImage = sliderImage;        }    }}

id表示验证码的id值，用于校验验证码，BackgroundImage 是验证码图片base64，包含了凹槽。凹槽模板在templates目录下。SliderImage 是滑块图片。模板在templates下。

CaptchaValidateData.cs

CaptchaValidateData.cs：验证码验证数据实体

namespace SlideCaptcha.Model{    public class CaptchaValidateData    {        /// <summary>        /// 滑动比例        /// </summary>        public float Percent { get; set; }        /// <summary>        /// 容错值(校验时用，缺口位置与实际滑动位置匹配容错范围)        /// </summary>        public float Tolerant { get; set; }        public CaptchaValidateData(float percent, float tolerant)        {            Percent = percent;            Tolerant = tolerant;        }    }}

ImageCaptchainfo.cs

ImageCaptchaInfo.cs：证码图片信息实体

namespace SlideCaptcha.Model{    public class ImageCaptchaInfo    {        /// <summary>        /// 背景图宽        /// </summary>        public int BackgroundImageWidth { get; set; }        /// <summary>        /// 背景图高        /// </summary>        public int BackgroundImageHeight { get; set; }        /// <summary>        /// 背景图        /// </summary>        public string BackgroundImageBase64 { get; set; }        /// <summary>        /// 滑动块图宽        /// </summary>        public int SliderImageWidth { get; set; }        /// <summary>        /// 滑动块图高        /// </summary>        public int SliderImageHeight { get; set; }        /// <summary>        /// 滑动块图        /// </summary>        public string SliderImageBase64 { get; set; }    }}

验证码实体类的基类，滑动验证码、旋转验证码、点选验证码、拼接验证码都基于这个类。

Resource.cs

Resource.cs ：资源实体类

namespace SlideCaptcha.Model{    public class Resource    {        public Resource(){}        /// <summary>        /// 资源数据        /// </summary>        public string Data { get; set; }        /// <summary>        /// 资源类型        /// </summary>        public string Type { get; set; }                /// <summary>        /// 构造函数        /// </summary>        /// <param name="type">资源类型</param>        /// <param name="data">资源数据</param>        public Resource(string type,string data)        {            Type = type;            Data = data;        }    }}

资源数据，Data为要生成验证码图片路径。Type为类型，目前仅为本地文件，后期将扩展URL模式。

SliderImageCaptchaInfo.cs

SliderImageCaptchaInfo.cs：滑动验证码实体类

using SlideCaptcha.Exceptions;namespace SlideCaptcha.Model{    public class SliderImageCaptchaInfo : ImageCaptchaInfo    {        /// <summary>        /// 凹槽x坐标        /// </summary>        public int X { get; set; }        /// <summary>        /// 凹槽y坐标        /// </summary>        public int Y { get; set; }        /// <summary>        /// 凹槽位置百分比        /// </summary>        public float Percent        {            get            {                if (BackgroundImageWidth <= 0) return 0;                return 1.0f * X / BackgroundImageWidth;            }        }        public void Check()        {            // 校验            if (this.X <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo数据异常: {nameof(X)}小于等于0");            if (this.Y <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo数据异常: {nameof(Y)}小于等于0");            if (this.BackgroundImageWidth <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo数据异常: {nameof(BackgroundImageWidth)}小于等于0");            if (this.BackgroundImageHeight <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo数据异常: {nameof(BackgroundImageHeight)}小于等于0");            if (this.SliderImageWidth <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo数据异常: {nameof(SliderImageWidth)}小于等于0");            if (this.SliderImageHeight <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo数据异常: {nameof(SliderImageHeight)}小于等于0");            if (string.IsNullOrWhiteSpace(this.BackgroundImageBase64)) throw new SlideCaptchaException($"SliderImageCaptchaInfo数据异常: {nameof(BackgroundImageBase64)}为空");            if (string.IsNullOrWhiteSpace(this.SliderImageBase64)) throw new SlideCaptchaException($"SliderImageCaptchaInfo数据异常: {nameof(SliderImageBase64)}为空");        }    }}

SlideTrack.cs

·SlideTrack.cs：滑动轨迹·

using SlideCaptcha.Exceptions;using System;using System.Collections.Generic;namespace SlideCaptcha.Model{    /// <summary>    /// 滑动轨迹    /// </summary>    public class SlideTrack    {        /// <summary>        /// 背景图片宽度(可能经过缩放，不是原始图片宽高)        /// </summary>        public int BackgroundImageWidth { get; set; }        /// <summary>        /// 背景图片高度(可能经过缩放，不是原始图片宽高)        /// </summary>        public int BackgroundImageHeight { get; set; }        /// <summary>        /// 滑块图片宽度(可能经过缩放，不是原始图片宽高)        /// </summary>        public int SliderImageWidth { get; set; }        /// <summary>        /// 滑块图片高度(可能经过缩放，不是原始图片宽高)        /// </summary>        public int SliderImageHeight { get; set; }        /// <summary>        /// 滑动开始时间(可能经过缩放，不是原始图片宽高)        /// </summary>        public DateTime StartTime { get; set; }        /// <summary>        /// 滑动结束时间        /// </summary>        public DateTime EndTime { get; set; }        /// <summary>        /// 轨迹        /// </summary>        public List<Track> Tracks { get; set; }        /// <summary>        /// 滑动比例        /// </summary>        public float Percent        {            get            {                if (this.BackgroundImageWidth <= 0) return -1;                if (this.Tracks.Count <= 0) return -1;                var lastTrack = this.Tracks[this.Tracks.Count - 1];                return 1.0f * lastTrack.X / this.BackgroundImageWidth;            }        }        public void Check()        {            // 校验            if (this.BackgroundImageWidth <= 0) throw new SlideCaptchaException($"SlideTrack数据异常: {nameof(BackgroundImageWidth)}小于等于0");            if (this.BackgroundImageHeight <= 0) throw new SlideCaptchaException($"SlideTrack数据异常: {nameof(BackgroundImageHeight)}小于等于0");            if (this.SliderImageWidth <= 0) throw new SlideCaptchaException($"SlideTrack数据异常: {nameof(SliderImageWidth)}小于等于0");            if (this.SliderImageHeight <= 0) throw new SlideCaptchaException($"SlideTrack数据异常: {nameof(SliderImageHeight)}小于等于0");            if (this.StartTime == DateTime.MinValue) throw new SlideCaptchaException($"SlideTrack数据异常: {nameof(StartTime)}为空");            if (this.EndTime == DateTime.MinValue) throw new SlideCaptchaException($"SlideTrack数据异常: {nameof(EndTime)}为空");        }        public void CheckTracks()        {            if (this.Tracks == null || this.Tracks.Count == 0) throw new SlideCaptchaException($"SlideTrack数据异常: {nameof(Tracks)}为空");        }    }}

TemplatePair.cs

·TemplatePair.cs：模板类·

namespace SlideCaptcha.Model{    public class TemplatePair    {        public TemplatePair() { }        /// <summary>        /// 滑块资源        /// </summary>        public Resource Slider { get; set; }        /// <summary>        /// 凹槽资源        /// </summary>        public Resource Notch { get; set; }        /// <summary>        /// 模板类型        /// </summary>        public string TYPE { get; set; }        /// <summary>        /// 构造函数        /// </summary>        /// <param name="slider">滑块资源</param>        /// <param name="notch">凹槽资源</param>        /// <param name="type">末班类型</param>        public TemplatePair(Resource slider, Resource notch,string type)        {            Slider = slider;            Notch = notch;            TYPE = type;        }        /// <summary>        /// 创建模板        /// </summary>        /// <param name="slider">滑块资源</param>        /// <param name="notch">凹槽资源</param>        /// <returns></returns>        public static TemplatePair Create(Resource slider, Resource notch,string type)        {            return new TemplatePair(slider, notch,type);        }            }}

Track.cs

Track.cs ：滑动数据实体类

namespace SlideCaptcha.Model{    public class Track    {        /// <summary>        /// X轴        /// </summary>        public int X { get; set; }        /// <summary>        /// Y轴        /// </summary>        public int Y { get; set; }        /// <summary>        /// 时间        /// </summary>        public int T { get; set; }    }}

代码中SlideCaptchaException是自定义错误类。自定义错误类在Extensions文件夹下。

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