Facebook login using OAuth 2.0

Question

1. I want people to log in to my site with their Facebook accounts.
2. I need to pull some info from their Facebook profile and add it to my site\'s database

Answer 1

In OAuth 2.0 with facebook, the overall concept is simple as follows.

Step 1. Obtain "Authorization Code" by a GET request

request URI: https://www.facebook.com/dialog/oauth
Params:
    response_type=code
    client_id={add your "App id" got by registering app}
    redirect_uri={add redirect uri defined at the registration of app}
    scope={add the scope needed in your app}
Headers: None

Step 2. Obtain the "Access Token" by sending the authorization code as a POST request

request URI: https://graph.facebook.com/oauth/access_token
Params:
    grant_type=authorization_code
    client_id=
    redirect_uri=
    code=
Headers:
    Authorization:Basic encode  with base64 
    Content-Type:application/json

Step 3. Use the access token got from above step and retrieve user resources