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.NET 6實現滑動驗證碼的示例詳解

瀏覽：426日期：2022-06-09 09:25:18

CaptchaData.cs

CaptchaData.cs：驗證碼的數據類實體

namespace SlideCaptcha.Model
{
    public class CaptchaData
    {
/// <summary>
/// id
/// </summary>
public string Id { get; set; }
/// <summary>
/// 背景圖(含凹槽)
/// </summary>
public string BackgroundImage { get; set; }
/// <summary>
/// 滑動塊圖
/// </summary>
public string SliderImage { get; set; }

public CaptchaData(string id, string backgroundImage, string sliderImage)
{
    Id = id;
    BackgroundImage = backgroundImage;
    SliderImage = sliderImage;
}
    }
}

id表示驗證碼的id值，用于校驗驗證碼，BackgroundImage 是驗證碼圖片base64，包含了凹槽。凹槽模板在templates目錄下。SliderImage 是滑塊圖片。模板在templates下。

CaptchaValidateData.cs

CaptchaValidateData.cs：驗證碼驗證數據實體

namespace SlideCaptcha.Model
{
    public class CaptchaValidateData
    {
/// <summary>
/// 滑動比例
/// </summary>
public float Percent { get; set; }

/// <summary>
/// 容錯值(校驗時用，缺口位置與實際滑動位置匹配容錯范圍)
/// </summary>
public float Tolerant { get; set; }

public CaptchaValidateData(float percent, float tolerant)
{
    Percent = percent;
    Tolerant = tolerant;
}
    }
}

ImageCaptchaInfo.cs

ImageCaptchaInfo.cs：證碼圖片信息實體

namespace SlideCaptcha.Model
{
    public class ImageCaptchaInfo
    {
/// <summary>
/// 背景圖寬
/// </summary>
public int BackgroundImageWidth { get; set; }
/// <summary>
/// 背景圖高
/// </summary>
public int BackgroundImageHeight { get; set; }
/// <summary>
/// 背景圖
/// </summary>
public string BackgroundImageBase64 { get; set; }
/// <summary>
/// 滑動塊圖寬
/// </summary>
public int SliderImageWidth { get; set; }
/// <summary>
/// 滑動塊圖高
/// </summary>
public int SliderImageHeight { get; set; }
/// <summary>
/// 滑動塊圖
/// </summary>
public string SliderImageBase64 { get; set; }
    }
}

驗證碼實體類的基類，滑動驗證碼、旋轉驗證碼、點選驗證碼、拼接驗證碼都基于這個類。

Resource.cs

Resource.cs ：資源實體類

namespace SlideCaptcha.Model
{
    public class Resource
    {
public Resource(){}
/// <summary>
/// 資源數據
/// </summary>
public string Data { get; set; }

/// <summary>
/// 資源類型
/// </summary>
public string Type { get; set; }


/// <summary>
/// 構造函數
/// </summary>
/// <param name="type">資源類型</param>
/// <param name="data">資源數據</param>
public Resource(string type,string data)
{
    Type = type;
    Data = data;
}
    }
}

資源數據，Data為要生成驗證碼圖片路徑。Type為類型，目前僅為本地文件，后期將擴展URL模式。

SliderImageCaptchaInfo.cs

SliderImageCaptchaInfo.cs：滑動驗證碼實體類

using SlideCaptcha.Exceptions;

namespace SlideCaptcha.Model
{
    public class SliderImageCaptchaInfo : ImageCaptchaInfo
    {
/// <summary>
/// 凹槽x坐標
/// </summary>
public int X { get; set; }
/// <summary>
/// 凹槽y坐標
/// </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()
{
    // 校驗
    if (this.X <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo數據異常: {nameof(X)}小于等于0");
    if (this.Y <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo數據異常: {nameof(Y)}小于等于0");
    if (this.BackgroundImageWidth <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo數據異常: {nameof(BackgroundImageWidth)}小于等于0");
    if (this.BackgroundImageHeight <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo數據異常: {nameof(BackgroundImageHeight)}小于等于0");
    if (this.SliderImageWidth <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo數據異常: {nameof(SliderImageWidth)}小于等于0");
    if (this.SliderImageHeight <= 0) throw new SlideCaptchaException($"SliderImageCaptchaInfo數據異常: {nameof(SliderImageHeight)}小于等于0");
    if (string.IsNullOrWhiteSpace(this.BackgroundImageBase64)) throw new SlideCaptchaException($"SliderImageCaptchaInfo數據異常: {nameof(BackgroundImageBase64)}為空");
    if (string.IsNullOrWhiteSpace(this.SliderImageBase64)) throw new SlideCaptchaException($"SliderImageCaptchaInfo數據異常: {nameof(SliderImageBase64)}為空");
}
    }
}

SlideTrack.cs

·SlideTrack.cs：滑動軌跡·

using SlideCaptcha.Exceptions;
using System;
using System.Collections.Generic;

namespace SlideCaptcha.Model
{
    /// <summary>
    /// 滑動軌跡
    /// </summary>
    public class SlideTrack
    {
/// <summary>
/// 背景圖片寬度(可能經過縮放，不是原始圖片寬高)
/// </summary>
public int BackgroundImageWidth { get; set; }
/// <summary>
/// 背景圖片高度(可能經過縮放，不是原始圖片寬高)
/// </summary>
public int BackgroundImageHeight { get; set; }
/// <summary>
/// 滑塊圖片寬度(可能經過縮放，不是原始圖片寬高)
/// </summary>
public int SliderImageWidth { get; set; }
/// <summary>
/// 滑塊圖片高度(可能經過縮放，不是原始圖片寬高)
/// </summary>
public int SliderImageHeight { get; set; }
/// <summary>
/// 滑動開始時間(可能經過縮放，不是原始圖片寬高)
/// </summary>
public DateTime StartTime { get; set; }
/// <summary>
/// 滑動結束時間
/// </summary>
public DateTime EndTime { get; set; }
/// <summary>
/// 軌跡
/// </summary>
public List<Track> Tracks { get; set; }

/// <summary>
/// 滑動比例
/// </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()
{
    // 校驗
    if (this.BackgroundImageWidth <= 0) throw new SlideCaptchaException($"SlideTrack數據異常: {nameof(BackgroundImageWidth)}小于等于0");
    if (this.BackgroundImageHeight <= 0) throw new SlideCaptchaException($"SlideTrack數據異常: {nameof(BackgroundImageHeight)}小于等于0");
    if (this.SliderImageWidth <= 0) throw new SlideCaptchaException($"SlideTrack數據異常: {nameof(SliderImageWidth)}小于等于0");
    if (this.SliderImageHeight <= 0) throw new SlideCaptchaException($"SlideTrack數據異常: {nameof(SliderImageHeight)}小于等于0");
    if (this.StartTime == DateTime.MinValue) throw new SlideCaptchaException($"SlideTrack數據異常: {nameof(StartTime)}為空");
    if (this.EndTime == DateTime.MinValue) throw new SlideCaptchaException($"SlideTrack數據異常: {nameof(EndTime)}為空");
}

public void CheckTracks()
{
    if (this.Tracks == null || this.Tracks.Count == 0) throw new SlideCaptchaException($"SlideTrack數據異常: {nameof(Tracks)}為空");
}
    }
}

TemplatePair.cs

·TemplatePair.cs：模板類·


namespace SlideCaptcha.Model
{
    public class TemplatePair
    {

public TemplatePair() { }

/// <summary>
/// 滑塊資源
/// </summary>
public Resource Slider { get; set; }

/// <summary>
/// 凹槽資源
/// </summary>

public Resource Notch { get; set; }

/// <summary>
/// 模板類型
/// </summary>
public string TYPE { get; set; }

/// <summary>
/// 構造函數
/// </summary>
/// <param name="slider">滑塊資源</param>
/// <param name="notch">凹槽資源</param>
/// <param name="type">末班類型</param>
public TemplatePair(Resource slider, Resource notch,string type)
{
    Slider = slider;
    Notch = notch;
    TYPE = type;
}
/// <summary>
/// 創建模板
/// </summary>
/// <param name="slider">滑塊資源</param>
/// <param name="notch">凹槽資源</param>
/// <returns></returns>
public static TemplatePair Create(Resource slider, Resource notch,string type)
{
    return new TemplatePair(slider, notch,type);
}

    }
}

Track.cs

Track.cs ：滑動數據實體類

namespace SlideCaptcha.Model
{
    public class Track
    {
/// <summary>
/// X軸
/// </summary>
public int X { get; set; }

/// <summary>
/// Y軸
/// </summary>
public int Y { get; set; }

/// <summary>
/// 時間
/// </summary>
public int T { get; set; }
    }
}

代碼中SlideCaptchaException是自定義錯誤類。自定義錯誤類在Extensions文件夾下，這個后面的代碼會進行說明。

下載地址：https://pan.baidu.com/s/1YNlcO0llzO1041XqE4IYNg 提取碼：2vf5

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