= fgraph

* http://github.com/jugend/fgraph

== Description

Facebook Graph Ruby API implementation with Ruby magic (http://graph.facebook.com).

== Installation

  sudo gem install fgraph
    
== Rails Plugin Installation

Gem Plugin installation:

  sudo gem install fgraph

  # Edit [RAILS_ROOT]/config/environment.rb
  config.gem 'fgraph', :version => ">=0.2.0"
  
  # Edit [RAILS_ROOT]/Rakefile
  require 'tasks/fgraph'
  
  # Create fgraph.yml config in [RAILS_ROOT]/config
  rake fgraph:setup
  
Normal Plugin Installation:

  script/plugin install http://github.com/jugend/fgraph.git
  
=== Facebook Graph Cheat Sheet

  sudo gem install cheat
  cheat fbgraph

=== Single object query

  # Users: https://graph.facebook.com/btaylor  (Bret Taylor)
  FGraph.object('btaylor')

  # Pages: https://graph.facebook.com/cocacola (Coca-Cola page)
  FGraph.object('cocacola')

  # Fields selection with metadata
  FGraph.object('btaylor', :fields => 'id,name,picture', :metadata => 1)

  # Page photos
  FGraph.object('/cocacola/photos')
  FGraph.object_photos('cocacola')
  
  # Passing object hash as id
  friend = { 'name' => 'Mark Zuckerberg', 'id' => '4'}
  friend_details = FGraph.object(friend)

  # Current user: https://graph.facebook.com/me?access_token=...
  FGraph.me(:access_token => '...')

  # Current user's friends: https://graph.facebook.com/me/friends?access_token=...
  FGraph.me('friends', :access_token => '...')
  FGraph.me_friends(:access_token => '...')

=== Multiple objects query

  # Multiple users select: https://graph.facebook.com?ids=arjun,vernal
  FGraph.objects('arjun', 'herryanto')

  # Filter fields: https://graph.facebook.com?ids=arjun,vernal&fields=id,name,picture
  FGraph.objects('arjun', 'herryanto', :fields => 'id,name,picture')
  
  # Passing hash objects
  FGraph.objects([{:name => 'Arjun Banker', :id => 'arjun'}, {:name => 'Herryanto Siatono', :id => 'herryanto'}])

=== Collection Response
  
  friends = FGraph.me_friends(:limit => 5, :access_token => '...')
  friends.each do |friend|
    puts friend['name']
    puts friend['id']
  end
  
  # Other convenient methods
  friends.next?
  friends.next_url
  friends.next_options
  
=== OAuth

OAuth authorization URL:
  # https://graph.facebook.com/oauth/authorize?
  #   client_id=...&
  #   redirect_uri=http://www.example.com/oauth_redirect&
  #   scope=publish_stream
  FGraph.oauth_authorize_url('[client id]', 'http://www.example.com/oauth_redirect', :scope => 
    'publish_stream')

OAuth Access Token:
  # https://graph.facebook.com/oauth/access_token?
  #   client_id=...&
  #   client_secret=...&
  #   redirect_uri=http://www.example.com/oauth_redirect&
  #   code=...
  FGraph.oauth_access_token('[client id]', '[client secret]', 
     :redirect_uri => ''http://www.example.com/oauth_redirect', 
     :code => '[authorization code]')

OAuth Application Access Token, required to access application anlytics data:
  # https://graph.facebook.com/oauth/access_token?
  #   client_id=...&
  #   client_secret=...&
  #   type=client_cred
  FGraph.oauth_access_token('[client id]', '[client secret]', :type => 'client_cred')

=== Publish to Facebook Graph

  # Post to user's feed.
  #   curl -F 'access_token=...' \
  #     -F 'message=Hello, Arjun. I like this new API.' \
  #     https://graph.facebook.com/arjun/feed
  FGraph.publish('arjun/feed', :message => 'Hello, Arjun. I like this n  ew API.', 
    :access_token => '...')
  FGraph.publish_feed('arjun', :message => '...', :access_token => '...  ')
  FGraph.publish_feed('me', :message => '...', :access_token => '...')

=== Remove from Facebook Graph

  # DELETE https://graph.facebook.com/ID?access_token=... HTTP/1.1
  FGraph.remove('[ID]')
  FGraph.remove('[ID]/likes')
  FGraph.remove_likes('[ID]')

=== Search

  # https://graph.facebook.com/search?q=watermelon&type=post
  FGraph.search('watermelon', :type => 'post')
  FGraph.search_post('watermelon')

=== Insights

  # https://graph.facebook.com/client_id/insights?access_token=...
  FGraph.insights('[client_id]', '[app_access_token]')

  # https://graph.facebook.com/client_id/insights/application_api_call/day?access_token=...
  FGraph.insights('[client_id]', '[app_access_token]', :metric_path => 'application_api_call/day')

=== FGraph::Client
  
  # Initialize with default options
  fg_client = FGraph::Client.new(:client_id => '...', :client_secret => '...')
  fg_client.oauth_authorize_url('[redirect uri]', :scope => 'publish_stream')
  fg_client.oauth_access_token('[redirect uri]', '[authorization code]')
    
  # Intialize with access token
  fg_client = FGraph::Client.new(:access_token => '...')
  fg_client.me
  fg.client.publish_feed('herryanto', :message => 'Cool!')

=== Pagination Options

* <tt>limit</tt> - max no of records
* <tt>offset</tt> - offset
* <tt>until</tt> - since (a unix timestamp or any date accepted by strtotime, e.g. yesterday)

=== Rails Helper

Sample codes:

  <%= fgraph_javascript_init_tag %>
  <script type="text/javascript">
    FB.Event.subscribe('auth.sessionChange', function(response) {
      if (response.session) {
        // A user has logged in, and a new cookie has been saved
      } else {
        // The user has logged out, and the cookie has been cleared
      }
    });
  </script>
  
  <!-- Facebook Login Button -->
  <fb:login-button autologoutlink="true" perms="email,publish_stream"></fb:login-button>
  
  <% if fgraph_logged_in? %>
    <br>Hello <%= fgraph_user['name'] %>,
    <br><%= fgraph_image_tag(fgraph_user, 'large') %>
  <% end %>

For Asynchronous load, use <tt>window.afterFbAsyncInit</tt>:

  <script type="text/javascript">
    window.afterFbAsyncInit = function() {
      FB.Event.subscribe('auth.sessionChange', function(response) {
        if (response.session) {
          // A user has logged in, and a new cookie has been saved
        } else {
          // The user has logged out, and the cookie has been cleared
        }
      });
    }
  </script>
  <%= fgraph_javascript_init_tag :async => true %>
  
Facebook invalidates session token when you log out from <tt>facebook.com</tt>, 
and <tt>fgraph_logged_in?</tt> does not check if the session is still valid 
on Facebook server. The trick is you have to catch <tt>FGraph::OAuthError</tt> 
in <tt>ApplicationController</tt>: 

  rescue_from FGraph::OAuthError do
    # Delete existing invalid cookies
    cookies.delete "fbs_#{FGraph.config['app_id']}"
    
    # Redirect to referrer page
    redirect_to request.env['REQUEST_PATH']
  end

== License

(The MIT License)

Copyright (c) 2010 Herryanto Siatono http://www.pluitsolutions.com

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.