123 lines
4.2 KiB
C#
123 lines
4.2 KiB
C#
using JNPF.Common.Const;
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using JNPF.Common.Manager;
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using JNPF.Common.Extension;
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using JNPF.DependencyInjection;
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using System.Runtime.InteropServices;
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using SkiaSharp;
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namespace JNPF.Common.Captcha.General;
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/// <summary>
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/// 常规验证码.
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/// </summary>
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public class GeneralCaptcha : IGeneralCaptcha, ITransient
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{
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private readonly ICacheManager _cacheManager;
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/// <summary>
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/// 构造函数.
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/// </summary>
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/// <param name="cacheManager"></param>
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public GeneralCaptcha(ICacheManager cacheManager)
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{
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_cacheManager = cacheManager;
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}
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/// <summary>
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/// 常规验证码.
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/// </summary>
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/// <param name="timestamp">时间戳.</param>
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/// <param name="width">宽度.</param>
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/// <param name="height">高度.</param>
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/// <param name="length">长度.</param>
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/// <returns></returns>
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public async Task<byte[]> CreateCaptchaImage(string timestamp, int width, int height, int length = 4)
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{
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return await Draw(timestamp, width, height, length);
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}
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/// <summary>
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/// 画.
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/// </summary>
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/// <param name="timestamp">时间抽.</param>
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/// <param name="width">宽度.</param>
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/// <param name="height">高度.</param>
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/// <param name="length">长度.</param>
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/// <returns></returns>
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private async Task<byte[]> Draw(string timestamp, int width, int height, int length = 4)
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{
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// 颜色列表，用于验证码、噪线、噪点
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var color = new[] { SKColors.Black, SKColors.Red, SKColors.DarkBlue, SKColors.Green, SKColors.Orange, SKColors.Brown, SKColors.DarkCyan, SKColors.Purple };
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var backcolors = new[] { SKColors.AntiqueWhite, SKColors.WhiteSmoke, SKColors.FloralWhite };
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// 验证码字体集合
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string[] fonts = new[] { "Cantarell" };
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if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
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{
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fonts = new[] { "宋体" };
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}
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// 验证码随机数
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Random codeRandom = new Random();
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string code = codeRandom.NextLetterAndNumberString(length); // 随机字符串集合
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// 相当于js的 canvas.getContext('2d')
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using SKBitmap bmp = new SKBitmap(width, height, SKColorType.Bgra8888, SKAlphaType.Premul);
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// 相当于前端的canvas
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using SKCanvas canvas = new SKCanvas(bmp);
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// 填充白色背景
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canvas.DrawColor(backcolors[codeRandom.Next(0, backcolors.Length - 1)]);
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// 样式 跟xaml差不多
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using SKPaint drawStyle = new SKPaint();
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// 填充验证码到图片
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for (int i = 0; i < code.Length; i++)
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{
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drawStyle.IsAntialias = true;
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drawStyle.TextSize = 30;
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var font = SKTypeface.FromFamilyName(fonts[codeRandom.Next(0, fonts.Length - 1)], SKFontStyleWeight.SemiBold, SKFontStyleWidth.ExtraCondensed, SKFontStyleSlant.Upright);
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drawStyle.Typeface = font;
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drawStyle.Color = color[codeRandom.Next(0, color.Length - 1)];
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// 写字
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canvas.DrawText(code[i].ToString(), (i + 1) * 16, 28, drawStyle);
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}
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// 生成6条干扰线
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for (int i = 0; i < 6; i++)
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{
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drawStyle.Color = color[codeRandom.Next(color.Length)];
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drawStyle.StrokeWidth = 1;
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canvas.DrawLine(codeRandom.Next(0, code.Length * 15), codeRandom.Next(0, 60), codeRandom.Next(0, code.Length * 16), codeRandom.Next(0, 30), drawStyle);
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}
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using var img = SKImage.FromBitmap(bmp);
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using var p = img.Encode(SKEncodedImageFormat.Png, 100);
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using var ms = new MemoryStream();
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// 缓存验证码正确集合
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await SetCode(timestamp, code, TimeSpan.FromMinutes(5));
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// 保存到流
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p.SaveTo(ms);
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return ms.ToArray();
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}
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/// <summary>
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/// 保存验证码缓存.
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/// </summary>
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/// <param name="timestamp">时间戳.</param>
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/// <param name="code">验证码.</param>
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/// <param name="timeSpan">过期时间.</param>
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public async Task<bool> SetCode(string timestamp, string code, TimeSpan timeSpan)
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{
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string cacheKey = string.Format("{0}{1}", CommonConst.CACHEKEYCODE, timestamp);
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return await _cacheManager.SetAsync(cacheKey, code, timeSpan);
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}
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} |