public IEnumerable <ExternalLoginViewModel> GetExternalLogins(string returnUrl, bool generateState = false)
{
IEnumerable <AuthenticationDescription> descriptions = Authentication.GetExternalAuthenticationTypes();
List <ExternalLoginViewModel> logins = new List <ExternalLoginViewModel>();
string state;
if (generateState)
{
const int strengthInBits = 256;
state = RandomOAuthStateGenerator.Generate(strengthInBits);
}
else
{
state = null;
}
foreach (AuthenticationDescription description in descriptions)
{
ExternalLoginViewModel login = new ExternalLoginViewModel
{
Name = description.Caption,
Url = Url.Route("ExternalLogin", new
{
provider = description.AuthenticationType,
response_type = "token",
client_id = Startup.PublicClientId,
redirect_uri = new Uri(Request.RequestUri, returnUrl).AbsoluteUri,
state = state
}),
State = state
};
logins.Add(login);
}
return(logins);
}
/// <summary>
/// 生成固定字节的随机数的十六进制字符串。
/// </summary>
/// <param name="size">字节数。</param>
/// <returns>返回固定字节的随机数的十六进制字符串。</returns>
public static string GeneralKey(int size)
{
return(RandomOAuthStateGenerator.Generate(size));
}
