Question

SA
I have a application written in RubyonRails and I want to make him post periodically on facebook fan page.
I used fb_graph gem to do that.
I created my facebook app and I get my Access Token to use it but when I use this peace of code

me = FbGraph::User.me(ACCESS_TOKEN)
me.feed!(
:message => 'Updating via FbGraph',
:picture => 'https://graph.facebook.com/matake/picture',
:link => 'http://github.com/nov/fb_graph',
:name => 'FbGraph',
:description => 'A Ruby wrapper for Facebook Graph API'
)

I get permission denied error message.

How can I get the permission to post on my fan page wall?

Thanks in advance.

Answer 1

Link to the docs:

http://developers.facebook.com/docs/authentication/

There are several flows, but essentially, you provide a link for the client to authenticate at facebook:

https://www.facebook.com/dialog/oauth?client_id=YOUR_APP_ID&redirect_uri=YOUR_U‌​RL&scope=publish_stream,manage_pages

After authing this redirects to a URL on your site prepared to handle the param code, which you then turn around and send back to facebook for your access_token, which you provide to fb_graph.

https://graph.facebook.com/oauth/access_token?client_id=YOUR_APP_ID&redirect_ur‌​i=YOUR_URLclient_secret=YOUR_APP_SECRET&code=CODE

There are other permissions as well, so you might want to check the facebook docs to see if there are more you need.

Facebook uses OAuth 2 for auth, and there are several ruby gems you can use to facilitate this process slightly, including the oauth2 gem.