題外話，有網友說，這玩意根本很容易破解，確實是這樣。但驗證碼這東西，就跟鎖子很類似，防君子不防小人。驗證碼的發明其實是社會文明的退步。因為它阻礙了真正的使用者，卻無法阻擋別有用心的人。但又有什麼辦法呢？

上一篇文章新增了一些基本類，本篇內容主要目的是建立一些介面類

ValidateResult.cs
ICaptcha.cs
IResourceHandler.cs
IResourceHandlerManager.cs
IResourceManager.cs
IResourceProvider.cs
ISliderCaptchaImageGenerator.cs
IStorage.cs
IValidator.cs

ValidateResult.cs

在專案根目錄下，建立ValidateResult.cs。其功能是提供驗證後返回的資訊

namespace SlideCaptcha
{
    public class ValidateResult
    {
        public ValidateResultType Result { get; set; }
        public string Message { get; set; }

        public static ValidateResult Success()
        {
            return new ValidateResult { Result = ValidateResultType.Success, Message = "成功" };
        }

        public static ValidateResult Fail()
        {
            return new ValidateResult { Result = ValidateResultType.ValidateFail, Message = "驗證失敗" };
        }

        public static ValidateResult Timeout()
        {
            return new ValidateResult { Result = ValidateResultType.Timeout, Message = "驗證超時" };
        }

        public enum ValidateResultType
        {
            Success = 0,
            ValidateFail = 1,
            Timeout = 2
        }
    }
}

ICaptcha.cs

在Interface資料夾下，建一個ICaptcha.cs，用於生成驗證碼和進行校驗。

using SlideCaptcha.Model;
using System.Threading.Tasks;

namespace SlideCaptcha.Interface
{
    public interface ICaptcha
    {
        /// <summary>
        /// 生成驗證碼
        /// </summary>
        /// <param name="captchaId">驗證碼id</param>
        /// <returns></returns>
        Task<CaptchaData> GenerateCaptchaImageAsync(string type, string captchaId = null);

        /// <summary>
        /// 校驗
        /// </summary>
        /// <param name="captchaId">驗證碼id</param>
        /// <param name="slideTrack">滑動軌跡</param>
        /// <returns></returns>
        ValidateResult Validate(string captchaId, SlideTrack slideTrack);
    }
}

IResourceHandler.cs

IResourceHandler.cs 用於生成驗證碼資源（驗證碼模板）。

using SlideCaptcha.Model;
using System.Threading.Tasks;

namespace SlideCaptcha.Interface
{
    public interface IResourceHandler
    {
        /// <summary>
        /// 判斷傳入的資源型別是否存在
        /// </summary>
        /// <param name="handlerType"></param>
        /// <returns></returns>
        bool CanHandle(string handlerType);

        /// <summary>
        /// 生成資源
        /// </summary>
        /// <param name="resource"></param>
        /// <returns></returns>
        Task<byte[]> Handle(Resource resource);
    }
}

IResourceHandlerManager.cs

IResourceHandlerManager.cs用於根據資源（驗證碼模板），獲取資源byte[]資料。

using SlideCaptcha.Model;
using System.Threading.Tasks;

namespace SlideCaptcha.Interface
{
    public interface IResourceHandlerManager
    {
        /// <summary>
        /// 根據資源，生成所需要的byte[]
        /// </summary>
        /// <param name="resource"></param>
        /// <returns></returns>
        Task<byte[]> Handle(Resource resource);
    }
}

IResourceManager.cs

IResourceManager.cs用於獲取驗證碼背景資料與驗證碼模板資料

using System.Threading.Tasks;

namespace SlideCaptcha.Interface
{
    public interface IResourceManager
    {
        /// <summary>
        /// 隨機獲取驗證碼圖片背景
        /// </summary>
        /// <returns></returns>
       Task<byte[]> RandomBackground();
       /// <summary>
       /// 隨機獲取模板
       /// </summary>
       /// <param name="type">模板型別，滑動、旋轉、點選</param>
       /// <returns></returns>
       Task<(byte[], byte[])> RandomTemplate(string type);
    }
}

IResourceProvider.cs

IResourceProvider.cs用於提供驗證碼背景圖片與模板圖片的List

using SlideCaptcha.Model;
using System.Collections.Generic;

namespace SlideCaptcha.Interface
{
    public interface IResourceProvider
    {
        /// <summary>
        /// 提供驗證碼背景圖片
        /// </summary>
        /// <returns></returns>
        List<Resource> Backgrounds();

        /// <summary>
        /// 提供模板資源
        /// </summary>
        /// <returns></returns>
        List<TemplatePair> Templates();
    }
}

ISliderCaptchaImageGenerator.cs

ISliderCaptchaImageGenerator.cs用於生成滑動驗證碼

using SlideCaptcha.Model;
using System.Threading.Tasks;

namespace SlideCaptcha.Interface
{
    public interface ISliderCaptchaImageGenerator
    {
        /// <summary>
        /// 生成滑動驗證碼
        /// </summary>
        /// <param name="captchaId">驗證碼ID</param>
        /// <returns></returns>
        Task<SliderImageCaptchaInfo> Generate(string captchaId);
    }
}

IStorage.cs

IStorage.cs 用於快取的操作

using System;

namespace SlideCaptcha.Interface
{
    public interface IStorage
    {
        /// <summary>
        /// 設定快取
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <param name="absoluteExpiration"></param>
        void Set<T>(string key, T value, DateTimeOffset absoluteExpiration);

        /// <summary>
        /// 獲取快取
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <returns></returns>
        T Get<T>(string key);

        /// <summary>
        /// 刪除快取
        /// </summary>
        /// <param name="key"></param>

        void Remove(string key);
    }
}

IValidator.cs

IValidator.cs 用於提供校驗驗證碼資料。

using SlideCaptcha.Model;

namespace SlideCaptcha.Interface
{
    public interface IValidator
    {
        /// <summary>
        /// 校驗驗證碼資料
        /// </summary>
        /// <param name="slideTrack">滑動</param>
        /// <param name="captchaValidateData">校驗</param>
        /// <returns></returns>
        bool Validate(SlideTrack slideTrack, CaptchaValidateData captchaValidateData);
    }
}

下載地址（包括驗證碼原始碼、伺服器端API範例、前端程式碼有HTML+JQyeryt、vue3兩個範例）

https://pan.baidu.com/s/19mx24FXrnqz9u2mmFqlr6g?pwd=7636

NET 6 實現滑動驗證碼（三）、介面