public IActionResult Index(string key)
{
int number = 6, fontSize = 16, height = 32;
if (Request.Query.TryGetValue("n", out var qs) && int.TryParse(qs, out var value))
{
number = value;
}
if (Request.Query.TryGetValue("s", out qs) && int.TryParse(qs, out value))
{
fontSize = value;
}
if (Request.Query.TryGetValue("h", out qs) && int.TryParse(qs, out value))
{
height = value;
}
using var ms = Verifiers.Create(out var code, number, fontSize, height);
Response.Cookies.Append(key, Verifiers.Hashed(code), new CookieOptions {
Expires = DateTimeOffset.Now.AddMinutes(3)
});
Response.Body.Dispose();
return(File(ms.ToArray(), @"image/png"));
}
/// <summary>
/// 判断验证码。
/// </summary>
/// <param name="key">当前唯一键。</param>
/// <param name="code">验证码。</param>
/// <returns>返回判断结果。</returns>
protected virtual bool IsValidateCode(string key, string code)
{
if (string.IsNullOrEmpty(code) || !Request.Cookies.TryGetValue(key, out var value))
{
return(false);
}
code = Verifiers.Hashed(code);
return(string.Equals(value, code, StringComparison.OrdinalIgnoreCase));
}