How to create a login withGitHub and OAuth2

OAuth2 is a protocol for social login. It is a authorization framework that makes it possible for third-party apps to obtain limited access to an HTTP service, either on behalf of a resource owner by orchestrating an approval interaction between the resource owner and the HTTP service, or by allowing the third-party application to obtain access on its own behalf. The OAuth2 flow, as well as a description of the different components can bee seen below.

Client — Is the application that we develop and which wants to get access to the user’s account.

Resource owner –The user that is authenticating an application to get access to the account.

Authorization Server — The server that present the interface where the user can decline or accept the request.

Resource Server — Is the API server used to access the user’s information.

After following the guide for creating a simple web application we want to add the possibly to login through GitHub. First step is to add a drop-in login user interface, this can be made by running the following command.

Meteor add accounts-ui accounts-password

Users can now create an account and login to our web application. Now we want to add the option to login to the app through authorizing with GitHub. First we type the following command.

Meteor add accounts-github

The login button will also turn blue and enable the user to sign in with GitHub. If the user chose to login with GitHub, the username (that been chosen on GitHub) will be displayed.

When the user log in to the web application we want the users email to be displayed, for that we add the following in the imports/ui/App.js file. This calls the getStuff function if a user is login and returns a variable called email created as a session. We also add the session variable in the render function in the same direction.

When the user log in with their GitHub accounts both the username and email will be now be displayed in the application.

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