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Javascript for faceboof button code#

I commented some validation and saving middleware here just for convenient, you need to do it if you wanna use it in production. 1Ĭonst asyncAllFBAuth = ( req, res, next) => ,ģ.5 Finally, send the JWT back to the client. We need to exchange for the long time token and we need to retrieve the user information via the short time token. We need to implement the startToAuth() 1ģ.3 Add the middleware you need to Promise.all the 2 sub-steps you need for Step 3 Now let’s assume the user grants our permission. So, how do you get the access token? It will trigger the checkLoginState() that you just set and pass the token as the parameter. It seems no matter what you set in that Valid OAuth redirect URIs in Developer portal, if you use official SDK, it won’t go there. })( document, "script", "facebook-jssdk") The user decline our request, do something here if you want. The if else inside FB.getLoginStatus is where add your own logic.

Javascript for faceboof button code#

Now add the code for that login button, 2 things to notice, 3.1 Add facebook button 1Īdd Zepto and your own javascript file. You can still get the access token in the client side js.ģ. Which means you could use Promise.all to make it happen faster.Ī trick in step.2 is facebook won’t redirect you to the callback URL as it did when you use passport.js, but don’t worry here. The sub-steps in Step 3 could happen at the same time. Because when your jwt expires, you could simply let the user login via facebook again.

If you just use facebook to authenticate a user, you could skip step 4 entirely. The client could use the token to access an authorized endpoint. Generate a JSON web token(jwt) with your own signature and passback it back to the client.

You could get some user information via the short life token.

You should exchange for a long life token with the previous one.

Two things could happen after the last step: Press the button, it will leads the user to the facebook login page.Īfter the user grants the permission to our app, it will go to the callback URL you assigned at facebook developer portal along with an short-life access token. Place the Facebook button along with its javascript code, it will render a blue login button on the page. Workflowīefore we even start, let’s review what will happen next? 2.1 Flow The thing we used to identify the user is called access token. Here we just let the facebook do it for us, so we can confirm that is user is trustable. The basic idea of authentication is just to get the identity to verify who you are so you could later on use to access some authorized resources. Even you just use passport.js or other languages, after reading this article, you should understand what happens underneath. The article will walk you through the flow with example code. But a recent project requires to use the official SDK. Add the cursor:pointer so it will look like a button.Most often in universal javascript project we tends to use passport.js. So we add the CSS rules, set the position fixed, 50px from bottom and 50px from the right. We want to position all these things to the bottom right of the page some text we add a which will wrap all the buttons. Now we want to create a big button on the bottom right.