使用.Net Core实现的一个图形验证码功能

services.AddMemoryCache()
    .AddSimpleCaptcha(builder =>
    {
        builder.UseMemoryStore();
    });

private readonly ICaptcha _captcha;

public HomeController(ICaptcha captcha)
{
    _captcha = captcha;
}

public IActionResult Captcha(string id)
{
    var info = _captcha.Generate(id);
    var stream = new MemoryStream(info.CaptchaByteData);
    return File(stream, "image/png");
}

public IActionResult Validate(string id, string code)
{
    var result = _captcha.Validate(id, code);
    return Json(new { success = result });
}

services.AddSimpleCaptcha(builder =>
{
    builder.AddConfiguration(options =>
    {
        options.CodeLength = 6;
    });
});

services.AddSimpleCaptcha(builder =>
{
    builder.AddConfiguration(options =>
    {
        options.ImageWidth = 100;
        options.ImageHeight = 36;
    });
});

services.AddSimpleCaptcha(builder =>
{
    builder.AddConfiguration(options =>
    {
        options.IgnoreCase = false;
    });
});

services.AddSimpleCaptcha(builder =>
{
    builder.AddConfiguration(options =>
    {
        options.ExpiryTime =TimeSpan.FromMinutes(10);
    });
});

public class MyCaptchaCodeGenerator : ICaptchaCodeGenerator
{
    public string Generate(int length)
    {
        throw new NotImplementedException();
    }
}

services.AddSimpleCaptcha(builder =>
{
    builder.AddConfiguration(options =>
    {
        options.CodeGenerator = new MyCaptchaCodeGenerator();
    });
});

public class CaptchaImageGenerator : ICaptchaImageGenerator
{
    public byte[] Generate(int width, int height, string captchaCode)
    {
        throw new NotImplementedException();
    }
}

services.AddSimpleCaptcha(builder =>
{
    builder.AddConfiguration(options =>
    {
        options.ImageGenerator = new CaptchaImageGenerator();
    });
});