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- using Admin.Core;
- using Admin.Core.Common.Attributes;
- using Admin.Core.Common.Cache;
- using Newtonsoft.Json;
- using System;
- using System.Drawing;
- using System.Drawing.Drawing2D;
- using System.Drawing.Imaging;
- using System.IO;
- using System.Threading.Tasks;
- /*
- Linux下Ubuntu如果报Gdip错误,需要按照以下步骤操作
- 1. apt-get install libgdiplus
- 2. cd /usr/lib
- 3. ln -s libgdiplus.so gdiplus.dll
- */
- namespace Admin.Tools.Captcha
- {
- /// <summary>
- /// 滑块拼图验证
- /// </summary>
- [SingleInstance]
- public class SlideJigsawCaptcha : ICaptcha
- {
- private readonly ICache _cache;
- public SlideJigsawCaptcha(ICache cache)
- {
- _cache = cache;
- }
- /// <summary>
- /// Bitmap转为base64编码的文本
- /// </summary>
- /// <param name="bmp"></param>
- /// <returns></returns>
- private string ImgToBase64String(Bitmap bmp)
- {
- try
- {
- MemoryStream ms = new MemoryStream();
- bmp.Save(ms, ImageFormat.Png);
- byte[] arr = new byte[ms.Length];
- ms.Position = 0;
- ms.Read(arr, 0, (int)ms.Length);
- ms.Close();
- return Convert.ToBase64String(arr);
- }
- catch
- {
- return null;
- }
- }
- /// <summary>
- /// 读取像素
- /// </summary>
- /// <param name="img"></param>
- /// <param name="x"></param>
- /// <param name="y"></param>
- /// <param name="pixels"></param>
- private void ReadPixel(Bitmap img, int x, int y, int[] pixels)
- {
- int xStart = x - 1;
- int yStart = y - 1;
- int current = 0;
- for (int i = xStart; i < 3 + xStart; i++)
- {
- for (int j = yStart; j < 3 + yStart; j++)
- {
- int tx = i;
- if (tx < 0)
- {
- tx = -tx;
- }
- else if (tx >= img.Width)
- {
- tx = x;
- }
- int ty = j;
- if (ty < 0)
- {
- ty = -ty;
- }
- else if (ty >= img.Height)
- {
- ty = y;
- }
- pixels[current++] = img.GetPixel(tx, ty).ToArgb();
- }
- }
- }
- private void FillMatrix(int[][] matrix, int[] values)
- {
- int filled = 0;
- for (int i = 0; i < matrix.Length; i++)
- {
- int[] x = matrix[i];
- for (int j = 0; j < x.Length; j++)
- {
- x[j] = values[filled++];
- }
- }
- }
- private Color AvgMatrix(int[][] matrix)
- {
- int r = 0;
- int g = 0;
- int b = 0;
- for (int i = 0; i < matrix.Length; i++)
- {
- int[] x = matrix[i];
- for (int j = 0; j < x.Length; j++)
- {
- if (j == 1)
- {
- continue;
- }
- Color c = Color.FromArgb(x[j]);
- r += c.R;
- g += c.G;
- b += c.B;
- }
- }
- return Color.FromArgb(r / 8, g / 8, b / 8);
- }
- /// <summary>
- /// 根据模板生成拼图
- /// </summary>
- /// <param name="baseImage"></param>
- /// <param name="templateImage"></param>
- /// <param name="x"></param>
- /// <param name="y"></param>
- /// <returns></returns>
- private Bitmap CutByTemplate(Bitmap baseImage, Bitmap templateImage, int x, int y)
- {
- //生成透明背景图
- Bitmap newImage = new Bitmap(templateImage.Width, baseImage.Height);
- for (int i = 0, newImageWidth = templateImage.Width; i < newImageWidth; i++)
- {
- for (int j = 0, newImageHeight = baseImage.Height; j < newImageHeight; j++)
- {
- newImage.SetPixel(i, j, Color.FromArgb(0,0,0,0));
- }
- }
- // 临时数组遍历用于高斯模糊存周边像素值
- int[] values = new int[9];
- int[][] martrix = { new int[3], new int[3], new int[3] };
- int xLength = templateImage.Width;
- int yLength = templateImage.Height;
- // 模板图像宽度
- for (int i = 0; i < xLength; i++)
- {
- // 模板图片高度
- for (int j = 0; j < yLength; j++)
- {
- // 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
- int rgb = templateImage.GetPixel(i, j).ToArgb();
- if (rgb < 0)
- {
- Color oriImageColor = baseImage.GetPixel(x + i, y + j);
- newImage.SetPixel(i, y + j, oriImageColor);
- //抠图区域半透明
- //baseImage.SetPixel(x + i, y + j, Color.FromArgb(120, oriImageColor.R, oriImageColor.G, oriImageColor.B));
- //抠图区域高斯模糊
- ReadPixel(baseImage, x + i, y + j, values);
- FillMatrix(martrix, values);
- baseImage.SetPixel(x + i, y + j, AvgMatrix(martrix));
- }
- //防止数组越界判断
- if (i == (xLength - 1) || j == (yLength - 1))
- {
- continue;
- }
- int rightRgb = templateImage.GetPixel(i + 1, j).ToArgb();
- int downRgb = templateImage.GetPixel(i, j + 1).ToArgb();
- //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
- if ((rgb >= 0 && rightRgb < 0) || (rgb < 0 && rightRgb >= 0) || (rgb >= 0 && downRgb < 0) || (rgb < 0 && downRgb >= 0))
- {
- newImage.SetPixel(i, y + j, Color.White);
- baseImage.SetPixel(x + i, y + j, Color.White);
- }
- }
- }
- return newImage;
- }
- /// <summary>
- /// 根据模板生成干扰图
- /// </summary>
- /// <param name="baseImage"></param>
- /// <param name="templateImage"></param>
- /// <param name="x"></param>
- /// <param name="y"></param>
- private void InterferenceByTemplate(Bitmap baseImage, Bitmap templateImage, int x, int y)
- {
- // 临时数组遍历用于高斯模糊存周边像素值
- int[][] martrix = { new int[3], new int[3], new int[3] };
- int[] values = new int[9];
- int xLength = templateImage.Width;
- int yLength = templateImage.Height;
- // 模板图像宽度
- for (int i = 0; i < xLength; i++)
- {
- // 模板图片高度
- for (int j = 0; j < yLength; j++)
- {
- // 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
- int rgb = templateImage.GetPixel(i, j).ToArgb();
- if (rgb < 0)
- {
- Color oriImageColor = baseImage.GetPixel(x + i, y + j);
- //抠图区域半透明
- //baseImage.SetPixel(x + i, y + j, Color.FromArgb(120, oriImageColor.R, oriImageColor.G, oriImageColor.B));
- //抠图区域高斯模糊
- ReadPixel(baseImage, x + i, y + j, values);
- FillMatrix(martrix, values);
- baseImage.SetPixel(x + i, y + j, AvgMatrix(martrix));
- }
- //防止数组越界判断
- if (i == (xLength - 1) || j == (yLength - 1))
- {
- continue;
- }
- int rightRgb = templateImage.GetPixel(i + 1, j).ToArgb();
- int downRgb = templateImage.GetPixel(i, j + 1).ToArgb();
- //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
- if ((rgb >= 0 && rightRgb < 0) || (rgb < 0 && rightRgb >= 0) || (rgb >= 0 && downRgb < 0) || (rgb < 0 && downRgb >= 0))
- {
- baseImage.SetPixel(x + i, y + j, Color.White);
- }
- }
- }
- }
-
- /// <summary>
- /// 更改图片尺寸
- /// </summary>
- /// <param name="bmp"></param>
- /// <param name="width"></param>
- /// <param name="height"></param>
- /// <returns></returns>
- private Bitmap ResizeImage(Bitmap bmp, int width, int height)
- {
- try
- {
- Bitmap b = new Bitmap(width, height);
- Graphics g = Graphics.FromImage(b);
- // 图画质量
- g.InterpolationMode = InterpolationMode.HighQualityBicubic;
- g.DrawImage(bmp, new Rectangle(0, 0, width, height), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
- g.Dispose();
- return b;
- }
- catch
- {
- return null;
- }
- }
- /// <summary>
- /// 随机范围内数字
- /// </summary>
- /// <param name="startNum"></param>
- /// <param name="endNum"></param>
- /// <returns></returns>
- public int GetRandomInt(int startNum, int endNum)
- {
- return (endNum > startNum ? new Random().Next(endNum - startNum) : 0) + startNum;
- }
- /// <summary>
- /// 随机生成拼图坐标
- /// </summary>
- /// <param name="originalWidth"></param>
- /// <param name="originalHeight"></param>
- /// <param name="templateWidth"></param>
- /// <param name="templateHeight"></param>
- /// <returns></returns>
- private PointModel GeneratePoint(int originalWidth, int originalHeight, int templateWidth, int templateHeight)
- {
- Random random = new Random();
- int widthDifference = originalWidth - templateWidth;
- int heightDifference = originalHeight - templateHeight;
- int x;
- if (widthDifference <= 0)
- {
- x = 5;
- }
- else
- {
- x = random.Next(originalWidth - templateWidth - 100) + 100;
- }
- int y;
- if (heightDifference <= 0)
- {
- y = 5;
- }
- else
- {
- y = random.Next(originalHeight - templateHeight - 5) + 5;
- }
- return new PointModel(x, y);
- }
- /// <summary>
- /// 随机生成干扰图坐标
- /// </summary>
- /// <param name="originalWidth"></param>
- /// <param name="originalHeight"></param>
- /// <param name="templateWidth"></param>
- /// <param name="templateHeight"></param>
- /// <param name="blockX"></param>
- /// <param name="blockY"></param>
- /// <returns></returns>
- private PointModel GenerateInterferencePoint(int originalWidth, int originalHeight, int templateWidth, int templateHeight, int blockX, int blockY)
- {
- int x;
- if (originalWidth - blockX - 5 > templateWidth * 2)
- {
- //在原扣图右边插入干扰图
- x = GetRandomInt(blockX + templateWidth + 5, originalWidth - templateWidth);
- }
- else
- {
- //在原扣图左边插入干扰图
- x = GetRandomInt(100, blockX - templateWidth - 5);
- }
- int y;
- if (originalHeight - blockY - 5 > templateHeight * 2)
- {
- //在原扣图下边插入干扰图
- y = GetRandomInt(blockY + templateHeight + 5, originalHeight - templateHeight);
- }
- else
- {
- //在原扣图上边插入干扰图
- y = GetRandomInt(5, blockY - templateHeight - 5);
- }
- return new PointModel(x, y);
- }
- /// <summary>
- /// 获得验证数据
- /// </summary>
- /// <returns>JObject</returns>
- public async Task<CaptchaOutput> GetAsync()
- {
- //获取网络图片
- //var client = new HttpClient();
- //var stream = await client.GetStreamAsync("https://picsum.photos/310/155");
- //client.Dispose();
- //Bitmap baseImage = new Bitmap(stream);
- //stream.Dispose();
- var oriImage = Image.FromFile($@"{Directory.GetCurrentDirectory()}\wwwroot\captcha\jigsaw\{new Random().Next(1, 4)}.jpg".ToPath());
- //更改图片尺寸
- //Bitmap baseImage = ResizeImage(oriImage, 310, 155);
- Bitmap baseImage = new Bitmap(oriImage);
- oriImage.Dispose();
- var oriTemplate = Image.FromFile($@"{Directory.GetCurrentDirectory()}\wwwroot\captcha\jigsaw\templates\{new Random().Next(1, 7)}.png".ToPath());
- Bitmap templateImage = new Bitmap(oriTemplate);
- oriTemplate.Dispose();
- int baseWidth = baseImage.Width;
- int baseHeight = baseImage.Height;
- int templateWidth = templateImage.Width;
- int templateHeight = templateImage.Height;
- //随机生成拼图坐标
- PointModel point = GeneratePoint(baseWidth, baseHeight, templateWidth, templateHeight);
- int x = point.X;
- int y = point.Y;
- //生成拼图
- string blockImageBase64 = "data:image/png;base64," + ImgToBase64String(CutByTemplate(baseImage, templateImage, x, y));
- //生成干扰图
- PointModel interferencePoint = GenerateInterferencePoint(baseWidth, baseHeight, templateWidth, templateHeight, x, y);
- InterferenceByTemplate(baseImage, templateImage, interferencePoint.X, interferencePoint.Y);
- string baseImageBase64 = "data:image/png;base64," + ImgToBase64String(baseImage);
- templateImage.Dispose();
- baseImage.Dispose();
- var token = Guid.NewGuid().ToString();
- CaptchaOutput captchaData = new CaptchaOutput
- {
- Token = token,
- Data = new SlideJigsawCaptchaModel()
- {
- BlockImage = blockImageBase64,
- BaseImage = baseImageBase64
- }
- };
- var key = string.Format(CacheKey.VerifyCodeKey, token);
- await _cache.SetAsync(key, point.X);
- return captchaData;
- }
- /// <summary>
- /// 检查验证数据
- /// </summary>
- /// <param name="input"></param>
- /// <returns></returns>
- public async Task<bool> CheckAsync(CaptchaInput input)
- {
- if (input == null || input.Data.IsNull())
- {
- return false;
- }
- var key = string.Format(CacheKey.VerifyCodeKey, input.Token);
- if (await _cache.ExistsAsync(key))
- {
- try
- {
- var point = JsonConvert.DeserializeObject<PointModel>(input.Data);
- var x = await _cache.GetAsync<int>(key);
- if (Math.Abs(x - point.X) < 5)
- {
- if (input.DeleteCache)
- {
- await _cache.DelAsync(key);
- }
- return true;
- }
- else
- {
- await _cache.DelAsync(key);
- return false;
- }
- }
- catch
- {
- await _cache.DelAsync(key);
- return false;
- }
- }
- else
- {
- return false;
- }
- }
- }
- }
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