How to get the user access token?

[jeena]

I am trying to use fb_auth to post to my own timeline. To do that I need a user access token. I found, after quite some time, some code which would get me the token from https://github.com/nov/fb_graph#authentication (I wonder why this is not at the top of the readme):

client = fb_auth.client
client.authorization_code = params[:code]
access_token = client.access_token! :client_auth_body 

I see that params[:code] in my callback resource is a long string with characters and numbers, so it should be right. But the last line crashes my app with:

Rack::OAuth2::Client::Error

and this:

rack-oauth2 (1.0.7) lib/rack/oauth2/client.rb:119:in `handle_error_response'
rack-oauth2 (1.0.7) lib/rack/oauth2/client.rb:96:in `handle_response'
rack-oauth2 (1.0.7) lib/rack/oauth2/client.rb:70:in `access_token!'

I don't understand what is wrong, could someone explain to me what I am doing wrong?

[nov]

Inspect Rack::OAuth2::Client::Error. https://github.com/nov/rack-oauth2/blob/master/lib/rack/oauth2/client/error.rb

[jeena]

Ok thanks it seems after rewriting it like showed in some other example it started to work. Now I only have the problem that I can't figure out how to post public posts with feed!, the documentation doesn't say anything about that and if I just do `feed!(message: "hello world") it is only visible to my friends.

[nov]

You can pass any params as described in the official Graph API document in rubyish way. In this case, privacy object is what you need to set. https://developers.facebook.com/docs/graph-api/reference/user/feed/

So in rubyish way, it would be

me.feed!(
  message: 'Only to my friends',
  privacy: {
    value: :ALL_FRIENDS
  }
)