using Admin.NET.Core;
|
using Furion.DependencyInjection;
|
using Microsoft.Extensions.Caching.Memory;
|
using System.Drawing;
|
using System.Drawing.Imaging;
|
using System.Text;
|
using Yitter.IdGenerator;
|
|
namespace Admin.NET.Application
|
{
|
/// <summary>
|
/// 常规验证码
|
/// </summary>
|
public class GeneralCaptcha : IGeneralCaptcha, ITransient
|
{
|
private readonly IMemoryCache _memoryCache;
|
|
/// <summary>
|
///
|
/// </summary>
|
/// <param name="memoryCache"></param>
|
public GeneralCaptcha(IMemoryCache memoryCache)
|
{
|
_memoryCache = memoryCache;
|
}
|
|
/// <summary>
|
/// 生成验证码图片
|
/// </summary>
|
/// <param name="length"></param>
|
/// <returns></returns>
|
public ClickWordCaptchaResult CreateCaptchaImage(int length = 4)
|
{
|
var rtnResult = new ClickWordCaptchaResult();
|
|
var code = GenerateRandom(length); // 随机字符串集合
|
rtnResult.RepData.OriginalImageBase64 = Convert.ToBase64String(Draw(code)); //"data:image/jpg;base64," +
|
rtnResult.RepData.Token = YitIdHelper.NextId().ToString();
|
|
// 缓存验证码正确位置集合
|
var cacheOptions = new MemoryCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromSeconds(30));
|
_memoryCache.Set(CommonConst.CACHE_KEY_CODE + rtnResult.RepData.Token, code, cacheOptions);
|
|
rtnResult.RepData.Point = null; // 清空位置信息
|
return rtnResult;
|
}
|
|
private static byte[] Draw(string code)
|
{
|
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" };
|
|
using (var bmp = new Bitmap(codeW, codeH))
|
using (var g = Graphics.FromImage(bmp))
|
using (var ms = new MemoryStream())
|
{
|
g.Clear(Color.White);
|
var 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);
|
}
|
|
// 将验证码图片写入内存流
|
bmp.Save(ms, ImageFormat.Png);
|
return ms.ToArray();
|
}
|
}
|
|
private static 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();
|
// 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();
|
}
|
|
/// <summary>
|
/// 验证码验证
|
/// </summary>
|
/// <param name="input"></param>
|
/// <returns></returns>
|
public ClickWordCaptchaResult 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 (string.Compare(input.CaptchaCode, (string)code, true) != 0)
|
{
|
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;
|
}
|
}
|
}
|
