Facebook connect example

app/FacebookConnect/connecting.erb

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+<div>
+  <p>Please wait while we connect back to facebook</p>
+</div>

app/FacebookConnect/controller.rb

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+require 'rho/rhocontroller'
+
+class FacebookConnectController < Rho::RhoController
+
+  FB_API_ID = "121263761311760" 
+  FB_API_SECRET = "4eb7f3fa2cb42737d0a8b26b4fc5abf9"
+
+  FB_AUTH_URL = "https://www.facebook.com/dialog/oauth"
+  FB_GRAPH_URL = "https://graph.facebook.com"
+
+  RHOMOBILE_FB_ID = "56638045891"
+
+  RedirectServiceURL = "http://redirectme.to"
+
+  def self.getRedirectURL(local_call_back_url)
+    callback_url = RedirectServiceURL + "/" + '127.0.0.1:' + System.get_property('rhodes_port').to_s + local_call_back_url 
+    return callback_url
+  end
+
+  def self.getFBAuthURL(local_call_back_url)
+    call_back_url = getRedirectURL(local_call_back_url)
+    #call_back_url goes unencoded since Facebook requires it to be like that, hence it goes at the end of the request
+    url = "#{FB_AUTH_URL}?display=touch&client_id=#{FB_API_ID}&scope=user_likes&redirect_uri=#{call_back_url}"
+    #url = "#{FB_AUTH_URL}?client_id=#{FB_API_ID}&scope=user_likes&redirect_uri=#{call_back_url}"
+    return url
+  end
+
+  def self.getFBTokenURL(code, previous_call_back)
+    call_back_url = getRedirectURL(previous_call_back) #This is not going to be called by facebook, it is just to certify you have access to the token by providing the SAME URL that was given when requesting the token
+    #call_back_url goes unencoded since Facebook requires it to be like that, hence it goes at the end of the request
+    url = "#{FB_GRAPH_URL}/oauth/access_token?client_id=#{FB_API_ID}&client_secret=#{FB_API_SECRET}&code=#{code}&redirect_uri=#{call_back_url}"
+    return url
+  end
+
+  def self.getFBCheckLikeURL(token)
+    url = "#{FB_GRAPH_URL}/me/likes/#{RHOMOBILE_FB_ID}?access_token=#{token}"
+    return url
+  end
+
+  def index
+
+  end
+
+  def nothing
+
+    return "{ }" #Empty json 
+  end
+
+  def connect_to_facebook
+    local_callback_url = url_for(:action => :facebook_callback)
+    url = FacebookConnectController.getFBAuthURL(local_callback_url)
+
+    WebView.navigate(url)
+  end
+
+  def facebook_callback
+    #This is to achieve the effect of the "connecting" page
+    token_result = Rho::AsyncHttp.get(
+    :url => 'http://127.0.0.1:' + System.get_property('rhodes_port').to_s + url_for(:action => :facebook_check, :query => {'code' => @params['code']}),
+      :callback => url_for(:action => :nothing)
+    )
+
+    redirect :action => :connecting
+  end
+
+  def connecting
+
+  end
+
+  def facebook_check
+    code = @params['code']
+
+    token_url = FacebookConnectController.getFBTokenURL(code, url_for(:action => :facebook_callback))
+
+    #Since the "connecting" view is being displayed, we do the calls synchronously      
+    token_result = Rho::AsyncHttp.get(
+      :url => token_url
+    )
+
+    if token_result['status'] == "ok"
+      token = token_result['body'].split('&')[0].split('=')[1]
+      likes_url = FacebookConnectController.getFBCheckLikeURL(token)
+      likes_result = Rho::AsyncHttp.get(
+        :url => likes_url
+      )
+      if likes_result['status'] == "ok"
+        likes_data = Rho::JSON.parse(likes_result['body'])
+        if likes_data['data'].count > 0
+          #Like case
+          WebView.navigate(url_for :action => :facebook_check_callback, :query => {'likes' => 'true'})
+          return
+        else
+          #Don't like case
+          WebView.navigate(url_for :action => :facebook_check_callback, :query => {'likes' => 'false'})
+          return
+        end
+      end
+    end
+
+    Alert.show_popup( { 
+                :message => "There was a problem contacting Facebook, please try again later.",
+                :title => 'Error contacting Facebook',
+                :icon => :error,
+                :buttons => ["OK"] } )
+    WebView.navigate ( url_for :action => :index )
+  end
+
+  def facebook_check_callback
+    @message = nil
+    if @params['likes'].to_s == 'true'
+      @message = "You really like Rhomobile! Rock on!"
+    else
+      @message = "You don't like Rhomobile! Why?"
+    end
+  end
+
+end

app/FacebookConnect/facebook_check_callback.erb

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+<div>
+ <h1><%= @message %></h1>
+</div>

app/FacebookConnect/index.erb

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+<div>
+
+  <div>
+    <p>This demo shows how to use the Facebook Connect APIs to integrate your Rhodes app with Facebook.</p>
+    <p>It will verify if you have liked the Rhomobile product page. See the controller code for the magic and comments on directions.</p>
+  </div>
+
+  <div class="standardButton"><a target="_webapp" href="http://m.facebook.com/pages/Rhomobile/56638045891">Visit the Rhomobile page</a></div>
+
+  <br />
+  <br />
+
+  <form method="POST" action="<%= url_for :action => :connect_to_facebook %>" >
+    <input type="submit" class="standardButton" value="Do you like Rhomobile on facebook?"/>
+  </form>
+
+</div>

app/index.erb

@@ -174,7 +174,12 @@ Rhodes API tests
     <li><a href="JQueryMobileTest">UI JQueryMobile Form Demo</a></li>
     <li><a href="RexmlTest">Rexml test</a></li>
     <li><a href="JsonTest">Json test</a></li>    
-
+
+</ul>
+
+<p>Facebook</p>
+<ul>
+  <li><a href="FacebookConnect">Facebook Connect - "Check for like" Demo</a></li>
 </ul>
 
 <%= $mt_string %>