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+using Admin.Core.Common.Attributes;
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+using Admin.Core.Common.Cache;
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+using Newtonsoft.Json;
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+using System;
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+using System.Drawing;
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+using System.Drawing.Drawing2D;
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+using System.Drawing.Imaging;
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+using System.IO;
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+using System.Threading.Tasks;
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+
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+namespace Admin.Tools.Captcha
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+{
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+ /// <summary>
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+ /// 滑块拼图验证
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+ /// </summary>
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+ [SingleInstance]
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+ public class SlideJigsawCaptcha : ICaptcha
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+ {
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+ private readonly ICache _cache;
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+
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+ public SlideJigsawCaptcha(ICache cache)
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+ {
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+ _cache = cache;
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+ }
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+
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+ /// <summary>
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+ /// Bitmap转为base64编码的文本
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+ /// </summary>
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+ /// <param name="bmp"></param>
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+ /// <returns></returns>
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+ private string ImgToBase64String(Bitmap bmp)
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+ {
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+ try
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+ {
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+ MemoryStream ms = new MemoryStream();
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+ bmp.Save(ms, ImageFormat.Png);
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+ byte[] arr = new byte[ms.Length];
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+ ms.Position = 0;
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+ ms.Read(arr, 0, (int)ms.Length);
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+ ms.Close();
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+ return Convert.ToBase64String(arr);
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+ }
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+ catch
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+ {
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+ return null;
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+ }
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+ }
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+
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+ /// <summary>
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+ /// 根据模板生成拼图
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+ /// </summary>
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+ /// <param name="baseImage"></param>
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+ /// <param name="templateImage"></param>
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+ /// <param name="x"></param>
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+ /// <param name="y"></param>
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+ /// <returns></returns>
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+ private Bitmap CutByTemplate(Bitmap baseImage, Bitmap templateImage, int x, int y)
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+ {
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+ Bitmap newImage = new Bitmap(templateImage.Width, baseImage.Height, PixelFormat.Format32bppRgb);
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+ newImage.MakeTransparent();
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+
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+ int xLength = templateImage.Width;
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+ int yLength = templateImage.Height;
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+ // 模板图像宽度
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+ for (int i = 0; i < xLength; i++)
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+ {
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+ // 模板图片高度
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+ for (int j = 0; j < yLength; j++)
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+ {
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+ // 如果模板图像当前像素点不是透明色 copy源文件信息到目标图片中
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+ int rgb = templateImage.GetPixel(i, j).ToArgb();
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+ if (rgb < 0)
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+ {
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+ Color oriImageColor = baseImage.GetPixel(x + i, y + j);
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+
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+ newImage.SetPixel(i, y + j, oriImageColor);
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+
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+ //抠图区域半透明
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+ baseImage.SetPixel(x + i, y + j, Color.FromArgb(120, oriImageColor.R, oriImageColor.G, oriImageColor.B));
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+ }
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+
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+ //防止数组越界判断
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+ if (i == (xLength - 1) || j == (yLength - 1))
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+ {
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+ continue;
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+ }
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+
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+ int rightRgb = templateImage.GetPixel(i + 1, j).ToArgb();
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+ int downRgb = templateImage.GetPixel(i, j + 1).ToArgb();
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+ //描边处理，,取带像素和无像素的界点，判断该点是不是临界轮廓点,如果是设置该坐标像素是白色
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+ if ((rgb >= 0 && rightRgb < 0) || (rgb < 0 && rightRgb >= 0) || (rgb >= 0 && downRgb < 0) || (rgb < 0 && downRgb >= 0))
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+ {
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+ newImage.SetPixel(i, y + j, Color.White);
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+ baseImage.SetPixel(x + i, y + j, Color.White);
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+ }
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+ }
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+ }
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+ return newImage;
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+ }
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+
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+ /// <summary>
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+ /// 根据模板生成干扰图
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+ /// </summary>
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+ /// <param name="baseImage"></param>
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+ /// <param name="templateImage"></param>
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+ /// <param name="x"></param>
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+ /// <param name="y"></param>
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+ private void InterferenceByTemplate(Bitmap baseImage, Bitmap templateImage, int x, int y)
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+ {
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+ int xLength = templateImage.Width;
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+ int yLength = templateImage.Height;
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+ // 模板图像宽度
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+ for (int i = 0; i < xLength; i++)
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+ {
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+ // 模板图片高度
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+ for (int j = 0; j < yLength; j++)
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+ {
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+ // 如果模板图像当前像素点不是透明色 copy源文件信息到目标图片中
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+ int rgb = templateImage.GetPixel(i, j).ToArgb();
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+ if (rgb < 0)
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+ {
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+ Color oriImageColor = baseImage.GetPixel(x + i, y + j);
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+
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+ //抠图区域半透明
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+ baseImage.SetPixel(x + i, y + j, Color.FromArgb(120, oriImageColor.R, oriImageColor.G, oriImageColor.B));
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+ }
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+
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+ //防止数组越界判断
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+ if (i == (xLength - 1) || j == (yLength - 1))
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+ {
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+ continue;
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+ }
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+
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+ int rightRgb = templateImage.GetPixel(i + 1, j).ToArgb();
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+ int downRgb = templateImage.GetPixel(i, j + 1).ToArgb();
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+ //描边处理，,取带像素和无像素的界点，判断该点是不是临界轮廓点,如果是设置该坐标像素是白色
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+ if ((rgb >= 0 && rightRgb < 0) || (rgb < 0 && rightRgb >= 0) || (rgb >= 0 && downRgb < 0) || (rgb < 0 && downRgb >= 0))
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+ {
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+ baseImage.SetPixel(x + i, y + j, Color.White);
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+ }
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+ }
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+ }
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+ }
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+
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+
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+ /// <summary>
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+ /// 更改图片尺寸
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+ /// </summary>
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+ /// <param name="bmp"></param>
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+ /// <param name="width"></param>
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+ /// <param name="height"></param>
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+ /// <returns></returns>
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+ private Bitmap ResizeImage(Bitmap bmp, int width, int height)
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+ {
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+ try
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+ {
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+ Bitmap b = new Bitmap(width, height);
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+ Graphics g = Graphics.FromImage(b);
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+ // 图画质量
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+ g.InterpolationMode = InterpolationMode.HighQualityBicubic;
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+ g.DrawImage(bmp, new Rectangle(0, 0, width, height), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
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+ g.Dispose();
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+
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+ return b;
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+ }
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+ catch
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+ {
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+ return null;
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+ }
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+ }
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+
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+ /// <summary>
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+ /// 随机范围内数字
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+ /// </summary>
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+ /// <param name="startNum"></param>
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+ /// <param name="endNum"></param>
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+ /// <returns></returns>
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+ public int GetRandomInt(int startNum, int endNum)
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+ {
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+ return (endNum > startNum ? new Random().Next(endNum - startNum) : 0) + startNum;
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+ }
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+
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+ /// <summary>
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+ /// 随机生成拼图坐标
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+ /// </summary>
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+ /// <param name="originalWidth"></param>
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+ /// <param name="originalHeight"></param>
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+ /// <param name="templateWidth"></param>
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+ /// <param name="templateHeight"></param>
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+ /// <returns></returns>
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+ private PointModel GeneratePoint(int originalWidth, int originalHeight, int templateWidth, int templateHeight)
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+ {
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+ Random random = new Random();
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+ int widthDifference = originalWidth - templateWidth;
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+ int heightDifference = originalHeight - templateHeight;
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+ int x;
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+ if (widthDifference <= 0)
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+ {
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+ x = 5;
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+ }
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+ else
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+ {
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+ x = random.Next(originalWidth - templateWidth - 100) + 100;
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+ }
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+
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+ int y;
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+ if (heightDifference <= 0)
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+ {
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+ y = 5;
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+ }
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+ else
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+ {
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+ y = random.Next(originalHeight - templateHeight - 5) + 5;
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+ }
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+
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+ return new PointModel(x, y);
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+ }
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+
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+ /// <summary>
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+ /// 随机生成干扰图坐标
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+ /// </summary>
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+ /// <param name="originalWidth"></param>
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+ /// <param name="originalHeight"></param>
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+ /// <param name="templateWidth"></param>
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+ /// <param name="templateHeight"></param>
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+ /// <param name="blockX"></param>
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+ /// <param name="blockY"></param>
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+ /// <returns></returns>
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+ private PointModel GenerateInterferencePoint(int originalWidth, int originalHeight, int templateWidth, int templateHeight, int blockX, int blockY)
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+ {
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+ int x;
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+ if (originalWidth - blockX - 5 > templateWidth * 2)
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+ {
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+ //在原扣图右边插入干扰图
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+ x = GetRandomInt(blockX + templateWidth + 5, originalWidth - templateWidth);
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+ }
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+ else
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+ {
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+ //在原扣图左边插入干扰图
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+ x = GetRandomInt(100, blockX - templateWidth - 5);
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+ }
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+
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+ int y;
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+ if (originalHeight - blockY - 5 > templateHeight * 2)
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+ {
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+ //在原扣图下边插入干扰图
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+ y = GetRandomInt(blockY + templateHeight + 5, originalHeight - templateHeight);
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+ }
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+ else
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+ {
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+ //在原扣图上边插入干扰图
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+ y = GetRandomInt(5, blockY - templateHeight - 5);
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+ }
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+
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+ return new PointModel(x, y);
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+ }
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+
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+ /// <summary>
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+ /// 获得验证数据
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+ /// </summary>
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+ /// <returns>JObject</returns>
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+ public async Task<CaptchaOutput> GetAsync()
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+ {
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+ //获取网络图片
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+ //var client = new HttpClient();
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+ //var stream = await client.GetStreamAsync("https://picsum.photos/310/155");
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+ //client.Dispose();
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+
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+ //更改图片尺寸
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+ //Bitmap oriImage = new Bitmap(stream);
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+ //Bitmap baseImage = ResizeImage(oriImage, 310, 155);
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+ //oriImage.Dispose();
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+
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+ //Bitmap baseImage = new Bitmap(stream);
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+
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+ var oriImage = Image.FromFile(Directory.GetCurrentDirectory() + $@"\wwwroot\captcha\jigsaw\{new Random().Next(1, 4)}.jpg");
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+ Bitmap baseImage = new Bitmap(oriImage);
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+ oriImage.Dispose();
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+
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+ var oriTemplate = Image.FromFile(Directory.GetCurrentDirectory() + $@"\wwwroot\captcha\jigsaw\templates\{new Random().Next(1, 7)}.png");
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+ Bitmap templateImage = new Bitmap(oriTemplate);
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+ oriTemplate.Dispose();
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+
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+ int baseWidth = baseImage.Width;
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+ int baseHeight = baseImage.Height;
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+ int templateWidth = templateImage.Width;
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+ int templateHeight = templateImage.Height;
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+
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+ //随机生成拼图坐标
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+ PointModel point = GeneratePoint(baseWidth, baseHeight, templateWidth, templateHeight);
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+ int x = point.X;
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+ int y = point.Y;
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+
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+ //生成拼图
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+ string blockImageBase64 = "data:image/png;base64," + ImgToBase64String(CutByTemplate(baseImage, templateImage, x, y));
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+
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+ //生成干扰图
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+ PointModel interferencePoint = GenerateInterferencePoint(baseWidth, baseHeight, templateWidth, templateHeight, x, y);
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+ InterferenceByTemplate(baseImage, templateImage, interferencePoint.X, interferencePoint.Y);
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+
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+ string baseImageBase64 = "data:image/png;base64," + ImgToBase64String(baseImage);
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+ templateImage.Dispose();
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+ baseImage.Dispose();
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+
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+ var token = Guid.NewGuid().ToString();
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+ CaptchaOutput captchaData = new CaptchaOutput
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+ {
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+ Token = token,
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+ Data = new SlideJigsawCaptchaModel()
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+ {
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+ BlockImage = blockImageBase64,
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+ BaseImage = baseImageBase64
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+ }
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+ };
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+
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+ var key = string.Format(CacheKey.VerifyCodeKey, token);
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+ await _cache.SetAsync(key, point.X);
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+
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+ return captchaData;
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+ }
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+
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+ /// <summary>
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+ /// 检查验证数据
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+ /// </summary>
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+ public async Task<bool> CheckAsync(SlideJigsawCaptchaInput input)
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+ {
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+ var key = string.Format(CacheKey.VerifyCodeKey, input.Token);
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+ if (await _cache.ExistsAsync(key))
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+ {
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+ try
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+ {
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+ var point = JsonConvert.DeserializeObject<PointModel>(input.Point);
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+ var x = await _cache.GetAsync<int>(key);
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+ if (Math.Abs(x - point.X) < 5)
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+ {
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+ return true;
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+ }
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+ else
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+ {
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+ return false;
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+ }
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+ }
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+ catch
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+ {
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+ await _cache.DelAsync(key);
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+ return false;
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+ }
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+ }
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+ else
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+ {
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+ return false;
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+ }
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+ }
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+ }
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+}
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zhontai
