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Web Development with Golang and Beego

Handling OAuth 2.0 Redirects

Learn to handle Facebook OAuth callbacks in Beego, covering authorization, token exchange, and user session management.

We'll cover the following...

Process

Handling the OAuth redirect callback is a critical part of implementing OAuth authentication in an application. This lesson demonstrates handling the OAuth 2.0 callback from Facebook in a Beego application.

It involves the the following steps:

  1. Receiving the authorization code

  2. Exchanging the authorization code for a token

  3. Using this token to fetch user details

  4. Creating a session to keep the user logged in

Setting up the route

Let’s set up a route to handle the callback URL. We assume that the callback URL is set to /auth/facebook.

Go (1.18.2)
package routers
import (
	"beego_notes/controllers"
	beego "github.com/beego/beego/v2/server/web"
)
func init() {
	beego.Router("/", &controllers.MainController{})
	beego.Router("/notes", &controllers.NotesController{}, "get:NotesIndex")
	beego.Router("/notes/new", &controllers.NotesController{}, "get:NotesNewForm")
	beego.Router("/notes", &controllers.NotesController{}, "post:NotesCreate")
	beego.Router("/notes/:id([0-9]+)", &controllers.NotesController{}, "get:NotesShow")
	beego.Router("/notes/edit/:id([0-9]+)", &controllers.NotesController{}, "get:NotesEditPage")
	beego.Router("/notes/:id", &controllers.NotesController{}, "post:NotesUpdate")
	beego.Router("/notes/:id", &controllers.NotesController{}, "delete:NotesDelete")
	beego.Router("/signup", &controllers.SessionsController{}, "get:SignupPage")
	beego.Router("/login", &controllers.SessionsController{}, "get:LoginPage")
	beego.Router("/signup", &controllers.SessionsController{}, "post:Signup")
	beego.Router("/login", &controllers.SessionsController{}, "post:Login")
	beego.Router("/logout", &controllers.SessionsController{}, "post:Logout")
	beego.Router("/auth/facebook", &controllers.OauthController{}, "get:FacebookAuth")
}

Here, we added a new Beego router:

  • Line 26: This line routes the GET /auth/facebook API to the FacebookAuth() method of the ...