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ASP NET Web API facebook authentication

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http://csharp-video-tutorials.blogspot.com/2017/02/aspnet-web-api-facebook-authentication.html

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http://csharp-video-tutorials.blogspot.com/2017/02/aspnet-web-api-facebook-authentication_8.html

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In this video we will discuss using Facebook authentication with ASP.NET Web API.

When the user clicks “Login with Facebook” button, he will be redirected to Facebook login page. The user will then provide his Facebook credentials. Once the login is successful, the user will be redirected to our application with an access token, which is a proof that the user is successfully authenticated and our web application grants access to the protected resources.

To use Facebook account for authentication, we will have to first register our application with Facebook.

Next enable Facebook OAuth authentication in ASP.NET Web API service

Step 1 : Facebook has made a breaking change to it’s API in version 2.4. The change is, in addition to the access token we also have to send the fields that we want in URI. In version 2.3 and earlier, the URI used to be as shown below. The access token is appended to the URI using a ?
https://graph.facebook.com/v2.3/me?access_token=ABC

With version 2.4, they have changed it to as shown below. Instead of using ? we have to use & to attach the access token to the URI
https://graph.facebook.com/v2.4/me?fields=id,email&access_token=ABC

The defualt implementation for the Facebook Client, that is provided by Microsoft attaches the access token to the URI using a ?, so we have to change it to &. To do that,
Add a folder to the project. Name it “Facebook”
Add a class file to the folder. Name it FacebookBackChannelHandler.cs
Copy and paste the code from my blog.

Step 2 : In Startup.Auth.cs file in App_Start folder iclude the following code block. Use the AppID and AppSecret that we got after registering our application with Facebook.

var facebookOptions = new FacebookAuthenticationOptions()
;

facebookOptions.Scope.Add(“email”);

app.UseFacebookAuthentication(facebookOptions);

Step 3 : On Login.html page, include the HTML for “Login with Facebook” button.

Step 4 : Wire up the click event handler for “Login with Facebook” button
$(‘#btnFacebookLogin’).click(function () );

Step 5 : In GoogleAuthentication.js file, modify isUserRegistered() and signupExternalUser() functions as shown below. I have included comments where the code is modified, so you know what has changed.

function isUserRegistered(accessToken) ,
success: function (response)
else
}
});
}

// Include provider parameter
function signupExternalUser(accessToken, provider) ,
success: function ()
});
}

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