public IActionResult CaptchaHttp()
{
string cookieName = CaptchaSettings.Instance().CaptchaCookieName;
int minCharacterCount = CaptchaSettings.Instance().MinCharacterCount;
int maxCharacterCount = CaptchaSettings.Instance().MaxCharacterCount;
bool enableLineNoise = CaptchaSettings.Instance().EnableLineNoise;
CaptchaCharacterSet characterSet = CaptchaSettings.Instance().CharacterSet;
string generatedKey = string.Empty;
bool isAddCooikes = false;
//创建或从缓存取验证码
string publicKey = null;
if (HttpContext.Request.Cookies[cookieName] != null)
{
publicKey = HttpContext.Request.Cookies[cookieName];
}
MemoryStream ms = null;
if (!string.IsNullOrEmpty(publicKey))
{
ms = VerificationCodeManager.GetCachedImageStream(publicKey);
}
//如果缓存中的数据已经过期移除，就走生成图片流程
if (ms == null)
{
//生成验证码图片并返回验证码并且缓存起来
string code = VerificationCodeManager.GenerateAndCacheImage(out generatedKey);
ms = VerificationCodeManager.GetCachedImageStream(generatedKey);
VerificationCodeManager.CacheCode(HttpContext, code, generatedKey);
isAddCooikes = true;
}
if (isAddCooikes)
{
HttpContext.Response.Cookies.Append(cookieName, generatedKey);
}
byte[] bytes = ms.ToArray();
Response.Body.Dispose();
return(File(bytes, @"image/jpeg"));
}