.NET 6实现滑动验证码的示例详解

这篇文章主要为大家详细介绍了如何利用.NET 6实现滑动验证码，文中的示例代码讲解详细，具有一定的借鉴价值，感兴趣的小伙伴可以了解一下

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，这个后面的代码会进行说明。

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