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JBoss Fuse - Connecting to Facebook

Got your camel working? now it's time to have some fun, how about update your Facebook status using Camel? From Camel 2.12 onwards, Facebook endpoint was added, which makes it a lot easier to implement.

So how does it works? Basically, Facebook provides a unofficial Java API called "facebook4j", so Camel uses this API to implement the integration with Facebook. 

Basically, Facebook requires OAuth for all client application authentication, please go to the Facebook developer site and register.  



And create a new application, because Facebook require you to set authority to different function for each application. For instance, with application A, you grant the publish and poll right with all your photos, and application B you grant the location information to it. So click on the "Apps" tab on top of the page. 


Choose website, 

Give a name to your application, and choose the type of your application,

Skip or go through the quick start.  After that, you will arrive in your demo dashboard, it has the information required to authenticate your camel accessing Facebook, make sure you store the App ID and App Secret (click on "show" to display), because we are going to use it later.


Let's take the easy way, and use the Graph API explorer tool to generate your token. A token is the key tells Facebook how long your session last and the approval permissions. We are going to use the temporary short-term token. Further reading about the token can be found here.


Choose the application you have created, and click on the Get Access Token,

The permissions pops up, make sure you click on the permission that you what to use. For our case, please click on "publish_actions" in "Extended Permission", and make sure you store the access token somewhere.


And now we are ready to create our first Camel-Facebook application. There are 3 must have parameters, 
  • oAuthAppId - The APP ID from application Dashboard 
  • oAuthAppSecret - The APP Secret from application Dashboard 
  • oAuthAccessToken - The user access token we got from the tool

There are also other none mandatory options, make sure you check the document if needed. 

Like the other camel components, Facebook also have Producer and Consumer too. 

Use Facebook producer when you want to send or perform actions on to Facebook, like posting a status, uploading a photo, leave comments, get account information and adding Tags, etc.. The detail functionality are also available on the document too. 

On the other hand consumer endpoints are responsible for the reading part of the action, we will also play with that in the demo too. 

This is a simple demo, to avoid any privacy issues with your friends, this time we are going to get your birthday from Facebook, calculate how many days left till your next birthday, and then publish it to your Facebook status. 

Make sure you have installed JBDS and the integration plugin.  
Go to JBDS, create a new blueprint Fuse project, enter Group ID and artifact ID. 


Open pom.xml and add camel-facebook dependency. 


Drag the endpoints from palette to canvas, 
Endpoint with uri : 
facebook://me?oAuthAppId={{oAuthAppId}}&oAuthAppSecret={{oAuthAppSecret}}&oAuthAccessToken={{oAuthAccessToken}}&consumer.delay=10000

and log: ${body}



Add the properties file containing facebook authentication settings, the 3 must have parameter mentioned above,  
  • oAuthAppId - The APP ID from application Dashboard 
  • oAuthAppSecret - The APP Secret from application Dashboard 
  • oAuthAccessToken - The user access token we got from the tool


The result returning from Facebook are objects from Facebook4j, simply create a java bean that does the actual business calculation. 

BirthdayCounter.java
package org.blogdemo.fbdemo;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import facebook4j.User;

public class BirthdayCounter {

 public int count(User user){
  if(user == null || user.getBirthday() == null){
   return -1;
  }
  
  String birthday = user.getBirthday();
  
     SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy"); 
     SimpleDateFormat yf = new SimpleDateFormat("yyyy");
     Date date = new Date();
          
     int endYear = Integer.parseInt(yf.format(date));
     String birthdayTempString = birthday.substring(0, birthday.length()-4)+endYear;
     
     Date birthdayThisYear = null;
     Date birthdayNextYear = null;
    
     try {
      birthdayThisYear = sdf.parse(birthdayTempString);
  } catch (ParseException e) {
   e.printStackTrace();
  }
     
     //Determine we should calculate from this year or next year
     if(birthdayTempString.equals(sdf.format(date))){
      return 0;
     }else if(birthdayThisYear.before(date)){
      birthdayTempString = birthday.substring(0, birthday.length()-4) + (endYear+1);
      try {
    birthdayNextYear = sdf.parse(birthdayTempString);
   } catch (ParseException e) {
    e.printStackTrace();
   }
     }else{
      birthdayTempString = birthday.substring(0, birthday.length()-4) + (endYear-1);
      birthdayNextYear = birthdayThisYear;
     }
     
  
     int dayDiff = daysBetween(date,birthdayNextYear);
  return dayDiff;
 }
 
 private int daysBetween(Date d1, Date d2){
  return (int)( (d2.getTime() - d1.getTime()) / (1000 * 60 * 60 * 24));
 }
 
}

And create another bean that converts String of text to another Facebook4j object, because we are going to publish a status feed to Facebook, and it will need to use the Facebook4j.postUpdate as the input body. 

FBUpdator.java
package org.blogdemo.fbdemo;

import facebook4j.PostUpdate;

public class FBUpdator {
 
 PostUpdate postUpdate = null;
 public PostUpdate update(String test){
  postUpdate = new PostUpdate(test);
  
  return postUpdate;
 }
}

Add two beans to the camel context by referencing it in the blueprint xml. 

  <bean id="birthdayCounter" class="org.blogdemo.fbreader.BirthdayCounter"/>
 <bean id="fbUpdator" class="org.blogdemo.fbreader.FBUpdator"/>

Now, complete the rest of the route. 


  
    
    
        
        
        
        
            
                ${body} < 0
                
                    I am a very mysterious person
                
            
            
                ${body} == 0
                
                    It's My BIRTHDAY!!!!
                
            
            
             
                    Counting down... ${body} more days to my birthday
                              
            
        
        
            
        
        
    


Run the camel route, and you will see the feed posted in Facebook home!


I have break the demo into 2 videos, 

First one shows you how to setup Facebook App and poll data from Facebook.


Second one shows you how to process and publish feed to Facebook status.


You can also find the code and the one click ready in my Github account too! 


Comments

Karan Dewan said…
This comment has been removed by the author.
iNCOGNiTo said…
Simple but handy :)

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