C#滑动验证码拼图验证功能实现(SlideCaptcha) C#滑动验证码拼图验证功能实现

使用背景：
实现分析：
后端代码：

准备：
使用：
前端代码：

结语：

使用背景：关于滑动验证码的使用场所还是非常多的，如：调取短信接口之前，和注册请求之前或者频繁会调用的接口都需要加这个拼图验证。这里先上一下效果图吧（心中无码，自然高清）。
话不多说，开撸！

文章图片

文章图片

实现分析：滑动验证码的逻辑也很简单。大概说一下：
1，服务器生成主图+附图（从主图裁剪下来的不需要管y坐标）并且存储X坐标；
2，前端传入本地X坐标到服务器。
3，服务器进行计算存储X坐标和本地X坐标相差值；
4，验证相差值是否在 0-2 之间，判断 true | false

后端代码：
准备：
增加SlideCaptcha文件夹，并且增加Captcha.cs CaptchaModel.cs Config.cs ImgFormat.cs 4个文件。分别是：验证，验证实体，配置和图片生成类。代码如下：
Captcha.cs

using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.IO; using System.Net; namespace SliderCaptcha.NET{public class Captcha{public static Captcha64Model GenerateBase64(){CaptchaModel model = Captcha.Generate(); if (model != null){return new Captcha64Model(){X = model.X,Y = model.Y,Background = ImageToBase64(model.Background,ImageFormat.Jpeg),Slide = ImageToBase64(model.Slide, ImageFormat.Png)}; }else{return null; }}/// /// 生成验证码/// /// public static CaptchaModel Generate(){Bitmap image = BgImage(); if (image != null){int l = Config.l; int d = Config.d; int width = image.Width; int height = image.Height; int x = RandomNext(width / 3, width - d - l - 10); //初始xint y = RandomNext(10 + d, height - l - 10); ; //初始yGraphicsPath path = GetSliderPath(x, y); Graphics g = GetGraphics(image); //水印if (Config.showWatermark){Font font = new Font("宋体", 12, FontStyle.Bold); SizeF size = g.MeasureString(Config.watermarkText, font); Point Plogo = new Point((int)(width - size.Width - 5), (int)(height - size.Height - 5)); Color color = image.GetPixel(Plogo.X, Plogo.Y); SolidBrush bru = new SolidBrush(AntiColor(color)); g.DrawString(Config.watermarkText, font, bru, Plogo); }Pen pen = new Pen(Color.FromArgb(200, 255, 255, 255), 2); g.DrawPath(pen, path); Image slider = CaptureSlider(image, path, x, width, height); SolidBrush brush = new SolidBrush(Color.FromArgb(100, 255, 255, 255)); g.FillPath(brush, path); g.Save(); g.Dispose(); return new CaptchaModel(){X = x,Y = y,Background = image,Slide = slider}; }return null; }/// /// 获取图片Graphics/// /// /// private static Graphics GetGraphics(Image image){Graphics g = Graphics.FromImage(image); g.SmoothingMode = SmoothingMode.HighQuality; g.CompositingQuality = CompositingQuality.HighQuality; g.InterpolationMode = InterpolationMode.High; return g; }/// /// 获取滑块path/// private static GraphicsPath GetSliderPath(int x, int y){int l = Config.l; int r = Config.r; int b = Config.b; int c = Config.c; int d = Config.d; int blod = Config.blod; GraphicsPath path = new GraphicsPath(FillMode.Winding); Point Pa = new Point(x, y); Point Pb = new Point(x + l / 2 - b, y - c + blod); Point Pd = new Point(x + l, y); Point Pe = new Point(Pd.X + c - blod, y + l / 2 - b); Point Pg = new Point(Pd.X, y + l); Point Ph = new Point(x, y + l); Point Pj = new Point(x + c - blod, Pe.Y); path.AddLine(Pa, Pb); path.AddArc(x + l / 2 - r, y - d, d, d, 130f, 280f); path.AddLines(new Point[] { Pd, Pe }); path.AddArc(x + l, y + l / 2 - r, d, d, 220f, 280f); path.AddLines(new Point[] { Pg, Ph }); path.AddArc(x, y + l / 2 - r, d, d, 140f, -280f); path.AddLine(Pj, Pa); return path; }/// /// 获取滑块区域/// /// /// /// /// /// /// private static Image CaptureSlider(Image image, GraphicsPath path, int x, int width, int height){Bitmap concave = new Bitmap(image.Width, image.Height); Graphics g = GetGraphics(concave); TextureBrush brush = new TextureBrush(image); g.Clear(Color.Transparent); g.FillPath(brush, path); g.Dispose(); return CaptureImage(concave, x, height); }/// /// 裁剪图片/// /// /// /// /// /// private static Image CaptureImage(Image fromImage, int offsetX, int height){int width = Config.l + Config.d + Config.blod; Bitmap bitmap = new Bitmap(width, height); Graphics g = GetGraphics(bitmap); g.DrawImage(fromImage, 0, 0, new Rectangle(offsetX, 0, width, height), GraphicsUnit.Pixel); g.Dispose(); return bitmap; }/// /// 生成随机数/// /// /// /// private static int RandomNext(int min, int max){Random random = new Random(Guid.NewGuid().GetHashCode()); return random.Next(min, max); }/// /// 取反色/// /// /// public static Color AntiColor(Color color){if (color.R > 128 && color.G > 128 && color.B > 128){return Color.Black; }else{return Color.White; }}/// /// 获取背景图/// /// private static Bitmap BgImage(){WebClient web = new WebClient(); int num = RandomNext(1, 20); Stream stream = web.OpenRead($"http://00x1.com/images/Pic/{num}.jpg"); Bitmap bitmap = (Bitmap)Image.FromStream(stream); return bitmap; }/// /// base64转图片/// /// /// public static Bitmap Base64ToImage(string base64string){byte[] b = Convert.FromBase64String(base64string); MemoryStream ms = new MemoryStream(b); Bitmap bitmap = new Bitmap(ms); return bitmap; }/// /// 图片转base64/// /// /// public static string ImageToBase64(Image image, ImageFormat format){if (image == null) return string.Empty; string strbaser64 = ""; try{string head = ""; string formatName = ImgFormat.NameFromGuid(format); head = $"data:image/{formatName.ToLower()}; base64,"; MemoryStream ms = new MemoryStream(); image.Save(ms, format); byte[] arr = new byte[ms.Length]; ms.Position = 0; ms.Read(arr, 0, (int)ms.Length); ms.Close(); strbaser64 = head+Convert.ToBase64String(arr); }catch (Exception){throw new Exception("Something wrong during convert!"); }return strbaser64; }}}

CaptchaModel.cs

using System; using System.Collections.Generic; using System.Drawing; using System.Linq; using System.Text; namespace SliderCaptcha.NET{public class CaptchaModel{public int X { get; set; }public int Y { get; set; }public Image Background { get; set; }public Image Slide { get; set; }}public class Captcha64Model{public int X { get; set; }public int Y { get; set; }public string Background { get; set; }public string Slide { get; set; }}}

using System; namespace SliderCaptcha.NET{public class Config{/// /// 矩形宽/// public static int l = 42; /// /// 圆形半径/// public static int r = 9; /// /// 圆形直径/// public static int d = r * 2; /// /// 计算圆形与矩形交接三角形边/// public static int a = (int)(r * Math.Sin(Math.PI * (50 / 180f))); public static int b = (int)(r * Math.Cos(Math.PI * (50 / 180f))); public static int c = r - a; /// /// 滑块边框/// public static int blod = 2; /// /// 水印/// public static string watermarkText = "SC.NET"; /// /// 是否显示水印/// public static bool showWatermark = true; }}

using System; using System.Collections.Generic; using System.Drawing.Imaging; namespace SliderCaptcha.NET{public class ImgFormat{private static Dictionary Formats = new Dictionary() {{"b96b3caa-0728-11d3-9d7b-0000f81ef32e","MemoryBmp"},{"b96b3cab-0728-11d3-9d7b-0000f81ef32e","Bmp"},{"b96b3cac-0728-11d3-9d7b-0000f81ef32e","Emf"},{"b96b3cad-0728-11d3-9d7b-0000f81ef32e","Wmf"},{"b96b3cae-0728-11d3-9d7b-0000f81ef32e","Jpeg"},{"b96b3caf-0728-11d3-9d7b-0000f81ef32e","Png"},{"b96b3cb0-0728-11d3-9d7b-0000f81ef32e","Gif"},{"b96b3cb1-0728-11d3-9d7b-0000f81ef32e","Tiff"},{"b96b3cb2-0728-11d3-9d7b-0000f81ef32e","Exif"},{"b96b3cb5-0728-11d3-9d7b-0000f81ef32e","Icon"}}; public static ImageFormat FormatFromGuid(ImageFormat format){return FormatFromGuid(format.Guid); }public static ImageFormat FormatFromGuid(Guid guid){return FormatFromGuid(guid.ToString()); }public static ImageFormat FormatFromGuid(string guid){if (Formats.ContainsKey(guid)){string name = Formats[guid]; ImageFormat format = null; switch (name){case "MemoryBmp":format = ImageFormat.MemoryBmp; break; case "Bmp":format = ImageFormat.Bmp; break; case "Emf":format = ImageFormat.Emf; break; case "Wmf":format = ImageFormat.Wmf; break; case "Gif":format = ImageFormat.Gif; break; case "Jpeg":format = ImageFormat.Jpeg; break; case "Png":format = ImageFormat.Png; break; case "Tiff":format = ImageFormat.Tiff; break; case "Exif":format = ImageFormat.Exif; break; case "Icon":format = ImageFormat.Icon; break; }return format; }else{return null; }}public static string NameFromGuid(ImageFormat format){return NameFromGuid(format.Guid); }public static string NameFromGuid(Guid guid){return NameFromGuid(guid.ToString()); }public static string NameFromGuid(string guid){if (Formats.ContainsKey(guid)){return Formats[guid]; }else{return string.Empty; }}}}

使用：
这里用的是asp.net mvc 的框架，用的是api接口，前后端分离供前端使用。具体使用根据个人需求，可以是接口调用亦可以是项目调用。
呼声如果很高的话，考虑出一个winfrom版本的滑动验证码~（滑稽）

[HttpGet]public IHttpActionResult GetCaptcha(){Captcha64Model model = Captcha.GenerateBase64(); CacheHelper.Cache.SetCache("sliderX", model.X); Hashtable ht = new Hashtable(); ht.Add("background", model.Background); ht.Add("slider", model.Slide); ht.Add("sliderXXXXX", model.X); return Json(ht); }/// /// 检查验证/// /// /// [HttpPost]public IHttpActionResult CheckCaptcha([FromBody] int x = 0){Hashtable hs = new Hashtable(); string Mess = ""; int Code = 0; var session = CacheHelper.Cache.GetCache("sliderX"); if (session == null){Mess = "请刷新验证码"; Code = 500; goto block; }string sliderXStr = session?.ToString(); // as stringint sliderX = Convert.ToInt32(sliderXStr); int difX = sliderX - x; if (difX >= 0 - Config.blod && difX <= Config.blod){Mess = "success"; Code = 0; }else{session = null; Mess = "错误"; Code = 500; }block:hs.Add("Mess", Mess); hs.Add("Code", Code); return Json(hs); }

前端代码：

Splide Captcha - 锐客网* {-webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; }.sc-captcha {width: 300px; margin: 100px auto; }.sc_net_panel {padding: 10px; }.sc_net_panel > div {position: relative; }.bg_slider {position: absolute; left: 0; top: 0; }.bg_refresh {position: absolute; right: 5px; top: 5px; background: #808080; color: #fff; border-radius: 3px; width: 16px; line-height: 16px; text-align: center; cursor: pointer; }.sc_net_slider_icon {position: absolute; left: 0; top: 0; height: 37px; text-align: center; border-radius: 5px; border: #808080 1px solid; width: 37px; line-height: 37px; cursor: pointer; }.sc_net_slider_icon:hover {color: #fff; background: #1991fa; }.sc_net_slider_text {position: absolute; left: 0; top: 0; text-align: center; width: 280px; color: #45494c; border: #808080 1px solid; border-radius: 5px; line-height: 35px; height: 37px; cursor: default; }.sc_net_slider_area {position: absolute; left: 0; top: 0; height: 37px; }?向右拖动滑块填充拼图?

结语：到这里基本上就已经完成了，以上前端地址更换成自己的接口即可。正常业务验证码是很频发的一个操作并且是多用户。所以缓存存储的时候也需要注意一下。
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