Facebook API Question posted in
The official documentation for the Facebook APIs can be found here.

Receive Facebook Graph API access_token after external login in .NET MVC core – Facebook api

I am trying to receive more information about the user after successful authentication with facebook in the

public async Task<IActionResult> ExternalLoginCallback(string returnUrl = null, string remoteError = null)

method of the Account controller.

How am I able to receive the facebook access_token, so that I can use the graph api? I think I may miss something obvious but unfortunately cannot find what I am missing..

Thank you very much for your help!

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2

Answers


  1. 0

    Set SaveTokens to true in options.

    var facebookOptions = new FacebookOptions
{
      AppId = "",
      AppSecret = "",
      SaveTokens = true,
      ...          
};

app.UseFacebookAuthentication(facebookOptions);

    And get it:

    HttpContext.Authentication.GetTokenAsync("access_token");

    Keep in mind to use GetTokenAsync you need to add using Microsoft.AspNetCore.Authentication;

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  2. 0

    Access Token may be stored in auth properties (OAuthOptions.SaveTokens option enable/disable this behavior, false by default).

    Use AuthenticationTokenExtensions class to get token from AuthenticationProperties:

    public static string GetTokenValue(this AuthenticationProperties properties, string tokenName)
public static IEnumerable<AuthenticationToken> GetTokens(this AuthenticationProperties properties)

    For example, if you use cookie authentication:

    var authInfo = await HttpContext.Authentication.GetAuthenticateInfoAsync(CookieAuthenticationDefaults.AuthenticationScheme);
string accessToken = authInfo.Properties.GetTokenValue("access_token");

    Notice, that before RC2 tokens were stored in claims (related PR), so you may find old code like next one, that doesn’t work 

    var token = User.FindFirst("access_token")?.Value
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