using Furion.DependencyInjection; using Microsoft.Extensions.Caching.Memory; using System; using System.ComponentModel.DataAnnotations; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Text; namespace Myshipping.Core; /// <summary> /// 常规验证码 /// </summary> public class GeneralCaptcha : IGeneralCaptcha, ITransient { private readonly IMemoryCache _memoryCache; public GeneralCaptcha(IMemoryCache memoryCache) { _memoryCache = memoryCache; } /// <summary> /// 生成验证码图片 /// </summary> /// <param name="length"></param> /// <returns></returns> public string CreateCaptchaImage(int length = 4) { return Convert.ToBase64String(Draw(length)); } private string GenerateRandom(int length) { var chars = new StringBuilder(); // 验证码的字符集,去掉了一些容易混淆的字符 char[] character = { '2', '3', '4', '5', '6', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' }; Random rnd = new Random(); // 生成验证码字符串 for (int i = 0; i < length; i++) { chars.Append(character[rnd.Next(character.Length)]); } return chars.ToString(); } private byte[] Draw(int length = 4) { int codeW = 110; int codeH = 36; int fontSize = 22; // 颜色列表,用于验证码、噪线、噪点 Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue }; // 字体列表,用于验证码 string[] fonts = new[] { "Times New Roman", "Verdana", "Arial", "Gungsuh", "Impact" }; var code = GenerateRandom(length); // 随机字符串集合 using (Bitmap bmp = new Bitmap(codeW, codeH)) using (Graphics g = Graphics.FromImage(bmp)) using (MemoryStream ms = new MemoryStream()) { g.Clear(Color.White); Random rnd = new Random(); // 画噪线 for (int i = 0; i < 1; i++) { int x1 = rnd.Next(codeW); int y1 = rnd.Next(codeH); int x2 = rnd.Next(codeW); int y2 = rnd.Next(codeH); var clr = color[rnd.Next(color.Length)]; g.DrawLine(new Pen(clr), x1, y1, x2, y2); } // 画验证码字符串 string fnt; Font ft; for (int i = 0; i < code.Length; i++) { fnt = fonts[rnd.Next(fonts.Length)]; ft = new Font(fnt, fontSize); var clr = color[rnd.Next(color.Length)]; g.DrawString(code[i].ToString(), ft, new SolidBrush(clr), (float)i * 24 + 2, (float)0); } // 缓存验证码正确集合 var cacheOptions = new MemoryCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromSeconds(30)); _memoryCache.Set(CommonConst.CACHE_KEY_CODE + Guid.NewGuid().ToString("N"), code, cacheOptions); // 将验证码图片写入内存流 bmp.Save(ms, ImageFormat.Png); return ms.ToArray(); } } /// <summary> /// 验证码验证 /// </summary> /// <param name="input"></param> /// <returns></returns> public dynamic CheckCode(GeneralCaptchaInput input) { var res = new ClickWordCaptchaResult(); var code = _memoryCache.Get(CommonConst.CACHE_KEY_CODE + input.Token); if (code == null) { res.repCode = "6110"; res.repMsg = "验证码已失效,请重新获取"; return res; } if (input.CaptchaCode != (string)code) { res.repCode = "6112"; res.repMsg = "验证码错误"; return res; } _memoryCache.Remove(CommonConst.CACHE_KEY_CODE + input.Token); res.repCode = "0000"; res.repMsg = "验证成功"; return res; } }