User1735516446 posted
I find it's easy to let Twitter，Facebook，Google and microsoftAccount external login by OAuth2, only uncomment the following lines like this :
app.UseCookieAuthentication(new CookieAuthenticationOptions
{
AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
LoginPath = new PathString("/Account/Login")
});
app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);
// Uncomment the following lines to enable logging in with third party login providers
app.UseMicrosoftAccountAuthentication(
clientId: "0dd000******************",
clientSecret: "BsW****************");
app.UseTwitterAuthentication(
consumerKey: "**",
consumerSecret: "**");
//app.UseFacebookAuthentication(
// appId: "",
// appSecret: "");
//app.UseGoogleAuthentication();
But how to let other website users login my website though Oauth2? the website have provide Oauth2 and it can provide Web API like ：https://graph.qq.com/oauth2.0/token?grant_type=authorization_code&client_id=[YOUR_APP_ID]&client_secret=[YOUR_APP_Key]&code=[The_AUTHORIZATION_CODE]&state=[The_CLIENT_STATE]&redirect_uri=[YOUR_REDIRECT_URI]
return : access_token=YOUR_ACCESS_TOKEN&expires_in=3600
