How to get Facebook first and last name values usi

问题:

I know that a 'Name' field is provided, but I would prefer to access the first and last names explicitly. Can someone help with this? I'm still wrapping my head around ASP.Net MVC.

回答1:

In your Startup.Auth.cs ConfigureAuth(IAppBuilder app) method, set the following for Facebook:

var x = new FacebookAuthenticationOptions();
        x.Scope.Add("email");
        x.AppId = "*";
        x.AppSecret = "**";
        x.Provider = new FacebookAuthenticationProvider()
        {
            OnAuthenticated = async context =>
                {
                    context.Identity.AddClaim(new System.Security.Claims.Claim("FacebookAccessToken", context.AccessToken));
                    foreach (var claim in context.User)
                    {
                        var claimType = string.Format("urn:facebook:{0}", claim.Key);
                        string claimValue = claim.Value.ToString();
                        if (!context.Identity.HasClaim(claimType, claimValue))
                            context.Identity.AddClaim(new System.Security.Claims.Claim(claimType, claimValue, "XmlSchemaString", "Facebook"));

                    }

                }
        };

        x.SignInAsAuthenticationType = DefaultAuthenticationTypes.ExternalCookie;
        app.UseFacebookAuthentication(x);
        /*
        app.UseFacebookAuthentication(
           appId: "*",
           appSecret: "*");
         * */

Then use this to access the user's login info:

var loginInfo = await AuthenticationManager.GetExternalLoginInfoAsync();

And then the following to get the first name:

var firstNameClaim = loginInfo.ExternalIdentity.Claims.First(c => c.Type == "urn:facebook:first_name");

回答2:

Facebook changed its permission api. You can get more information about it here: https://developers.facebook.com/docs/facebook-login/permissions

Name need public_profile permission

var facebookAuthenticationOptions = new FacebookAuthenticationOptions()
{
    AppId = "appId",
    AppSecret = "key"
};
facebookAuthenticationOptions.Scope.Add("email");
facebookAuthenticationOptions.Scope.Add("public_profile");
app.UseFacebookAuthentication(facebookAuthenticationOptions);

And you can get it using:

var loginInfo = await authenticationManager.GetExternalLoginInfoAsync();
loginInfo.ExternalIdentity.Claims.First(c => c.Type == "urn:facebook:name")

authenticationManager is an instance, you can get using:

HttpContext.GetOwinContext().Authentication;

回答3:

Unfortunately this method doesn't work anymore since Facebook changed their default return values with API update 2.4

It looks like the only way to get the first_name etc. now is to use the Facebook Graph API (like this posts suggests).

I also found this post on the Katana project site that addresses this issue and already submitted a pull request but it has not been merged jet.

Hopefully this safes somebody a little bit of time ;)

回答4:

As of 2017, this is the code that is working for me(Thanks to David Poxon's code above). Make sure you have upgraded to version 3.1.0 of Microsoft.Owin.Security.Facebook.

In the Startup.Auth.cs (or Startup.cs in some cases), place this code:

app.UseFacebookAuthentication(new FacebookAuthenticationOptions()
{
    AppId = "***",
    AppSecret = "****",
    BackchannelHttpHandler = new HttpClientHandler(),
    UserInformationEndpoint = "https://graph.facebook.com/v2.8/me?fields=id,name,email,first_name,last_name",
    Scope = { "email" },
    Provider = new FacebookAuthenticationProvider()
    {
        OnAuthenticated = async context =>
        {
            context.Identity.AddClaim(new System.Security.Claims.Claim("FacebookAccessToken", context.AccessToken));
            foreach (var claim in context.User)
            {
                var claimType = string.Format("urn:facebook:{0}", claim.Key);
                string claimValue = claim.Value.ToString();
                if (!context.Identity.HasClaim(claimType, claimValue))
                    context.Identity.AddClaim(new System.Security.Claims.Claim(claimType, claimValue, "XmlSchemaString", "Facebook"));
            }
        }
    }
});

Then in your controller's external login callback method, add this code:

var firstName = loginInfo.ExternalIdentity.Claims.First(c => c.Type == "urn:facebook:first_name").Value;

Likewise for getting last name, use the above line and replace the urn:facebook:first_name with urn:facebook:last_name

回答5:

 private Uri RedirectUri
        {
            get
            {
                var uriBuilder = new UriBuilder(Request.Url);
                uriBuilder.Query = null;
                uriBuilder.Fragment = null;
                uriBuilder.Path = Url.Action("FacebookCallback");
                return uriBuilder.Uri;
            }
    }

    [AllowAnonymous]
    public ActionResult Facebook()
    {
        var fb = new FacebookClient();
        var loginUrl = fb.GetLoginUrl(new
        {
            client_id = "296002327404***",
            client_secret = "4614cd636ed2029436f75c77961a8***",
            redirect_uri = RedirectUri.AbsoluteUri,
            response_type = "code",
            scope = "email" // Add other permissions as needed
        });

        return Redirect(loginUrl.AbsoluteUri);
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult LogOff()
    {
        FormsAuthentication.SignOut();
        return View("Login");
    }
    public ActionResult FacebookCallback(string code)
    {
        var fb = new FacebookClient();
        dynamic result = fb.Post("oauth/access_token", new
        {
            client_id = "296002327404***",
            client_secret = "4614cd636ed2029436f75c77961a8***",
            redirect_uri = RedirectUri.AbsoluteUri,
            code = code
        });

        var accessToken = result.access_token;

        // Store the access token in the session for farther use
        Session["AccessToken"] = accessToken;

        // update the facebook client with the access token so 
        // we can make requests on behalf of the user
        fb.AccessToken = accessToken;

        // Get the user's information
        dynamic me = fb.Get("me?fields=first_name,middle_name,last_name,id,email");
        string email = me.email;
        string firstname = me.first_name;
        string middlename = me.middle_name;
        string lastname = me.last_name;

        db.Insert_customer(firstname,email,null,null,null,null,null,null,null,null,null,null,1,1,System.DateTime.Now,1,System.DateTime.Now);

        // Set the auth cookie
        FormsAuthentication.SetAuthCookie(email, false);
        return RedirectToAction("Index", "Home");
    }

}
}

回答6:

Facebook has changed the way their Graph API returns value in upgrade 2.4. Now you need to explicitly specify all the fields that you want to get back.

See this note from: facebook for developers Upgrade Info:

Graph API changes in version 2.4

In the past, responses from Graph API calls returned a set of default fields. In order to reduce payload size and improve latency on mobile networks we have reduced the number of default fields returned for most Graph API calls. In v2.4 you will need to declaratively list the response fields for your calls.

To get Email, FirstName and LastName from facebook:

First, you need to install Facebook SDK for .NET nuget package

Then, in your startup.Auth.cs, change the configuration of Facebook Authentication as follow:

     app.UseFacebookAuthentication(new FacebookAuthenticationOptions
        {
            // put your AppId and AppSecret here. I am reading them from AppSettings 
            AppId = ConfigurationManager.AppSettings["FacebookAppId"],
            AppSecret = ConfigurationManager.AppSettings["FacebookAppSecret"],
            Scope = { "email" },
            Provider = new FacebookAuthenticationProvider
            {
                OnAuthenticated = context =>
                {
                    context.Identity.AddClaim(new System.Security.Claims.Claim("FacebookAccessToken", context.AccessToken));
                    return Task.FromResult(true);
                }
            }
        });

        // this is no longer needed
        //app.UseFacebookAuthentication(
        //   appId: ConfigurationManager.AppSettings["FacebookAppId"],
        //   appSecret: ConfigurationManager.AppSettings["FacebookAppSecret"]);

Finally, in your AccountController, add the following code to ExternalLoginCallback method:

if (string.Equals(loginInfo.Login.LoginProvider, "facebook", StringComparison.CurrentCultureIgnoreCase))
        {
            var identity = AuthenticationManager.GetExternalIdentity(DefaultAuthenticationTypes.ExternalCookie);
            var access_token = identity.FindFirstValue("FacebookAccessToken");
            var fb = new FacebookClient(access_token);

            // you need to specify all the fields that you want to get back
            dynamic myInfo = fb.Get("/me?fields=email,first_name,last_name"); 
            string email = myInfo.email;
            string firstName = myInfo.first_name;
            string lastName = myInfo.last_name;
        }

See facebook API Guid for more parameters that you can get back.

回答7:

Add firstname and last name in facebook option Scope

var facebookOptions = new Microsoft.Owin.Security.Facebook.FacebookAuthenticationOptions()
            {
                AppId = "your app id",
                AppSecret = "your app secret",
            };

            facebookOptions.Scope.Add("email");
            facebookOptions.Scope.Add("first_name");
            facebookOptions.Scope.Add("last_name");
            return facebookOptions;