Implemented Facebook Medium based on the koala gem

lib/broadcast/media/facebook.rb

@@ -0,0 +1,25 @@
+require 'koala'
+
+class Broadcast::Medium::Facebook < Broadcast::Medium::Oauth
+
+  def publish(message)
+    # We do not rescue any Koala exceptions to make them crash the sendout
+    # This should make debugging easier i.e. when fb has privilege issues
+
+    # Connect to facebook and get info about current user
+    graph       = Koala::Facebook::GraphAPI.new(options.token)
+    me          = graph.get_object('me')
+    # Get the connections to retrieve the appropriate page
+    connections = graph.get_connections(me['id'], 'accounts')
+    raise "No pages available" if connections.size == 0
+
+    # Find the page to post to
+    page        = connections.find { |connection| connection['name'] == options.page }
+    raise 'Page not found' if !page
+
+    # Create a new graph so that the page posts to itself
+    page_graph = Koala::Facebook::GraphAPI.new(page['access_token'])
+    page_graph.put_wall_post(message.body)
+  end
+
+end

spec/lib/broadcast/media/facebook_spec.rb

@@ -0,0 +1,66 @@
+require 'spec_helper'
+
+describe Broadcast::Medium::Facebook do
+
+  describe '.new' do
+
+    it "should create a new instance with options provided in config" do
+      medium  = Broadcast::Medium::Facebook.new
+      medium.options.token.should == 'fb_token'
+      medium.options.page.should == 'My Page'
+    end
+
+    it "should prioritize options argument over options provided in config" do
+      medium  = Broadcast::Medium::Facebook.new(:page => 'Different Page')
+      medium.options.token.should == 'fb_token'
+      medium.options.page.should == 'Different Page'
+    end
+
+  end
+
+  describe '#publish' do
+
+    before do
+      @medium  = Broadcast::Medium::Facebook.new
+      @message = Broadcast::Message::SpecWithChagingContent.new
+      @me = {"name"=>"Your Name", "username"=>"yourname", "timezone"=>0, "gender"=>"male", "id"=>"1", "last_name"=>"Name", "updated_time"=>"2011-06-01T17:29:02+0000", "verified"=>true, "locale"=>"en_US", "hometown"=>{"name"=>"Palo Alto", "id"=>"1"}, "link"=>"http://www.facebook.com/yourname", "first_name"=>"Your"}
+      @connections = [{"name"=>"My Page", "category"=>"Software", "id"=>"123", "access_token"=>"page_access_token"}]
+    end
+
+    it "should send the message to a Facebook page" do
+      mock_graph = mock
+      mock_page_graph = mock
+      Koala::Facebook::GraphAPI.should_receive(:new).with('fb_token').and_return(mock_graph)
+      Koala::Facebook::GraphAPI.should_receive(:new).with('page_access_token').and_return(mock_page_graph)
+      mock_graph.should_receive(:get_object).with('me').and_return(@me)
+      mock_graph.should_receive(:get_connections).with('1', 'accounts').and_return(@connections)
+
+      mock_page_graph.should_receive(:put_wall_post).with(@message.body)
+      @medium.publish(@message)
+    end
+
+    it "should raise an error when no pages are available" do
+      mock_graph = mock
+      mock_page_graph = mock
+      Koala::Facebook::GraphAPI.should_receive(:new).with('fb_token').and_return(mock_graph)
+      mock_graph.should_receive(:get_object).with('me').and_return(@me)
+      mock_graph.should_receive(:get_connections).with('1', 'accounts').and_return([])
+
+      lambda { @medium.publish(@message) }.should raise_error('No pages available')
+    end
+
+    it "should raise an error when no page was not found" do
+      mock_graph = mock
+      mock_page_graph = mock
+      Koala::Facebook::GraphAPI.should_receive(:new).with('fb_token').and_return(mock_graph)
+      mock_graph.should_receive(:get_object).with('me').and_return(@me)
+
+      @connections.first['name'] = 'Different name'
+      mock_graph.should_receive(:get_connections).with('1', 'accounts').and_return(@connections)
+
+      lambda { @medium.publish(@message) }.should raise_error('Page not found')
+    end
+
+  end
+
+end

spec/support/config.rb

@@ -34,6 +34,11 @@
     campfire.room      = 'My Room'
   }
 
+  config.facebook { |facebook|
+    facebook.token     = 'fb_token'
+    facebook.page      = 'My Page'
+  }
+
   config.irc { |irc|
     irc.username = 'foo'
     irc.server = 'irc.freenode.net'

spec/support/examples.rb

@@ -7,5 +7,12 @@ def body
   end
 end
 
+class Broadcast::Message::SpecWithChagingContent < Broadcast::Message
+  def body
+    "message | " + Time.now.to_s
+  end
+end
+
+
 class Broadcast::Medium::Spec < Broadcast::Medium
 end