Facebook Login
Login with Facebook allows users to login to any web app with their Facebook account.
Web
Package gologin
provides Go handlers for the Facebook OAuth2 Authorization flow and for obtaining the Facebook User struct.
Getting Started
go get github.com/dghubble/gologin/facebook
cd $GOPATH/src/github.com/dghubble/gologin/examples/facebook
go get .
Example App
main.go shows an example web app which uses gologin
to issue a client-side cookie session. For simplicity, no data is persisted.
Visit the Facebook Application Dashboard to get you app's id and secret. Add http://localhost:8080/facebook/callback
as a valid OAuth2 Redirect URL under Settings, Advanced.
Compile and run main.go
from examples/facebook
. Pass the client id and secret as arguments to the executable
go run main.go -client-id=xx -client-secret=yy
2015/09/25 23:09:13 Starting Server listening on localhost:8080
or set the FACEBOOK_CLIENT_ID
and FACEBOOK_CLIENT_SECRET
environment variables.
Here's what the flow looks like.
Authorization Flow
- The "Login with Facebook" link to the login handler directs the user to the Facebook OAuth2 Auth URL to obtain a permission grant.
- The redirection URI (callback handler) receives the OAuth2 callback, verifies the state parameter, and obtains a Token.
- The success
http.Handler
is called with a Context
which contains the Facebook Token and verified Facebook User struct.
- In this example, that User is read and used to issue a signed cookie session.