FbGraph2::Auth now works

lib/fb_graph2/auth.rb

@@ -1,13 +1,33 @@
 module FbGraph2
   class Auth < Rack::OAuth2::Client
+    class Grant
+      class FbExchangeToken < Rack::OAuth2::Client::Grant
+        attr_required :fb_exchange_token
+      end
+    end
+
     def initialize(client_id, client_secret, options = {})
       super options.merge(
         identifier: client_id,
         secret: client_secret,
         host: URI.parse(FbGraph2.root_url).host,
-        authorize_endpoint: '/oauth/authorize',
+        authorization_endpoint: '/oauth/authorize',
         token_endpoint: '/oauth/access_token'
       )
     end
+
+    def fb_exchange_token=(access_token)
+      @grant = Grant::FbExchangeToken.new(
+        fb_exchange_token: access_token
+      )
+    end
+
+    def access_token!(options = {})
+      super options.merge(
+        client_auth_method: :body
+      )
+    rescue Rack::OAuth2::Client::Error => e
+      raise Exception.detect_from_status(detect_from_status).new(e.message)
+    end
   end
 end

spec/fb_graph2/request_filter/authenticator_spec.rb

@@ -22,4 +22,12 @@ describe FbGraph2::RequestFilter::Authenticator do
       request.header["Authorization"].should == ["Bearer #{token.access_token}"]
     end
   end
+
+  context 'when Rack::OAuth2::AccessToken::Legacy given' do
+    let(:token) { Rack::OAuth2::AccessToken::Legacy.new access_token: 'token' }
+    it do
+      request_filter.filter_request(request)
+      request.header["Authorization"].should == ["OAuth #{token.access_token}"]
+    end
+  end
 end