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Update SimpleMathsCaptchaGenerator.cs

pull/19876/head
Salih 3 years ago
parent
de89634c08
commit
0475b105ae
1 changed files with 66 additions and 59 deletions
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  1. 125
      modules/cms-kit/src/Volo.CmsKit.Public.Web/Security/Captcha/SimpleMathsCaptchaGenerator.cs

125
modules/cms-kit/src/Volo.CmsKit.Public.Web/Security/Captcha/SimpleMathsCaptchaGenerator.cs
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@ -100,76 +100,83 @@ public class SimpleMathsCaptchaGenerator : ITransientDependency
private byte[] GenerateInternal(string stringText, CaptchaOptions options)
{
var random = new Random();
try
{
var random = new Random();
var drawables = new Drawables()
.FontPointSize(options.FontSize)
.StrokeColor(MagickColors.Transparent);
var drawables = new Drawables()
.FontPointSize(options.FontSize)
.StrokeColor(MagickColors.Transparent);
var family = MagickNET.FontFamilies.FirstOrDefault();
if (!family.IsNullOrWhiteSpace())
{
drawables = drawables.Font(family, options.FontStyle, FontWeight.Normal, FontStretch.Normal);
}
var size = (ushort)(drawables.FontTypeMetrics(stringText)?.TextWidth ?? 0);
using var image = new MagickImage(MagickColors.White, size + 15, options.Height);
double position = 0;
var startWith = (byte)random.Next(5, 10);
foreach (var character in stringText)
{
var text = character.ToString();
var color = options.TextColor[random.Next(0, options.TextColor.Length)];
drawables.FillColor(new MagickColor(color.R, color.G, color.B, color.A))
.Text(startWith + position,
RandomTextGenerator.GenerateNextFloat(image.BaseHeight / 2.3, image.BaseHeight / 1.7), text);
position += drawables.FontTypeMetrics(text)?.TextWidth ?? 0;
}
var family = MagickNET.FontFamilies.FirstOrDefault();
if (!family.IsNullOrWhiteSpace())
{
drawables = drawables.Font(family, options.FontStyle, FontWeight.Normal, FontStretch.Normal);
}
// add rotation
var rotation = GetRotation(options);
drawables.Rotation(rotation);
var size = (ushort)(drawables.FontTypeMetrics(stringText)?.TextWidth ?? 0);
using var image = new MagickImage(MagickColors.White, size + 15, options.Height);
drawables.Draw(image);
double position = 0;
var startWith = (byte)random.Next(5, 10);
Parallel.For(0, options.DrawLines, _ =>
{
// ReSharper disable once AccessToDisposedClosure
if (image is { IsDisposed: false })
foreach (var character in stringText)
{
var x0 = random.Next(0, random.Next(0, 30));
var y0 = random.Next(10, image.Height);
var x1 = random.Next(30, image.Width);
var y1 = random.Next(0, image.Height);
var text = character.ToString();
var color = options.TextColor[random.Next(0, options.TextColor.Length)];
drawables.FillColor(new MagickColor(color.R, color.G, color.B, color.A))
.Text(startWith + position,
RandomTextGenerator.GenerateNextFloat(image.BaseHeight / 2.3, image.BaseHeight / 1.7), text);
image.Draw(new Drawables()
.StrokeColor(options.DrawLinesColor[random.Next(0, options.DrawLinesColor.Length)])
.StrokeWidth(RandomTextGenerator.GenerateNextFloat(options.MinLineThickness,
options.MaxLineThickness))
.Line(x0, y0, x1, y1));
position += drawables.FontTypeMetrics(text)?.TextWidth ?? 0;
}
});
Parallel.For(0, options.NoiseRate, _ =>
{
if (image is { IsDisposed: false })
{
var x = random.Next(0, image.Width);
var y = random.Next(0, image.Height);
image.Draw(new Drawables()
.FillColor(options.NoiseRateColor[random.Next(0, options.NoiseRateColor.Length)])
.Point(x, y)
);
}
});
// add rotation
var rotation = GetRotation(options);
drawables.Rotation(rotation);
image.Resize(new MagickGeometry(options.Width, options.Height) { IgnoreAspectRatio = true });
drawables.Draw(image);
return image.ToByteArray(options.Encoder);
Parallel.For(0, options.DrawLines, _ =>
{
// ReSharper disable once AccessToDisposedClosure
if (image is { IsDisposed: false })
{
var x0 = random.Next(0, random.Next(0, 30));
var y0 = random.Next(10, image.Height);
var x1 = random.Next(30, image.Width);
var y1 = random.Next(0, image.Height);
image.Draw(new Drawables()
.StrokeColor(options.DrawLinesColor[random.Next(0, options.DrawLinesColor.Length)])
.StrokeWidth(RandomTextGenerator.GenerateNextFloat(options.MinLineThickness,
options.MaxLineThickness))
.Line(x0, y0, x1, y1));
}
});
Parallel.For(0, options.NoiseRate, _ =>
{
if (image is { IsDisposed: false })
{
var x = random.Next(0, image.Width);
var y = random.Next(0, image.Height);
image.Draw(new Drawables()
.FillColor(options.NoiseRateColor[random.Next(0, options.NoiseRateColor.Length)])
.Point(x, y)
);
}
});
image.Resize(new MagickGeometry(options.Width, options.Height) { IgnoreAspectRatio = true });
return image.ToByteArray(options.Encoder);
}
catch (Exception e)
{
return Array.Empty<byte>();
}
}
private double GetRotation(CaptchaOptions options)

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