Publish a photo in a facebook fan page. Using groovy and RestFB API.

gistfile1.groovy

@Grapes(
    @Grab(group='com.restfb', module='restfb', version='1.6.12')
)

import com.restfb.DefaultFacebookClient
import com.restfb.json.JsonObject
import com.restfb.types.FacebookType
import com.restfb.Parameter
import com.restfb.BinaryAttachment
import java.io.FileInputStream

def token = "YOUR_TOKEN"
def page = "PAGE_ID"

def facebook = new DefaultFacebookClient(token)

// two ways of publishing photos in a facebook fan page

// publish a photo in the page album. 
facebook.publish("${page}/photos", 
                 String.class, 
                 BinaryAttachment.with("testImage.jpg",new FileInputStream("<URL_TO_IMAGE_IN_YOUR_FILESYSTEM>")),
                 Parameter.with("message", "A example test message that appears next to the image"))

// this publish a post in the page feed with a photo url.                
facebook.publish("${page}/feed", 
                 String.class, 
                 Parameter.with("message", "A example test message that appears next to the image"),
                 Parameter.with("picture", "https://www.google.es/images/srpr/logo11w.png"),
                 Parameter.with("caption", "google logo"))
                 
// when you make a GET to PAGE_ID/feed the photos appears as well. Facebook return the photos with "type:photo" and the messages you POST to "feed" with "type:link". Extrange behaviour posting photos to 'photos' that can be retrieved in 'feed' as well...