A demonstration of uploading images to Facebook using the Graph API from ruby

photoupload.rb

require 'rubygems' if RUBY_VERSION < '1.9'
require 'net/https'
require 'uri'
require 'multipart'

FACEBOOK_GRAPH_SERVER='https://graph.facebook.com'

def post_https(url, data, header)
  
  uri = URI.parse(url)
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true
  # http.verify_mode = OpenSSL::SSL::VERIFY_NONE # Don't use this in production, only to diagnose if you have a common config problem
  
  begin
    response = http.request_post(uri.request_uri, data, header)  
    
    result = nil
    if response.code != '200'
      log "Bad response code #{response.status} for '#{url}'"
      result = nil
    else
      result = response.body
    end
  rescue NoMethodError
    result = nil
  end
  
  result
end

def upload_photo_to_facebook(facebook_id, access_token, image_data, message)
  
  multipart_post = Multipart::Post.new()
  multipart_params = { 'source' => { 'path' => 'screenshot.png', 'read' => image_data },
    'message' => message,
  }
  post_data, post_header = multipart_post.prepare_query(multipart_params)

  host = FACEBOOK_GRAPH_SERVER
  method = '/me/photos?'
  arguments = [
    'access_token='+u(access_token),
  ].join('&')
  
  url = host+method+arguments
  post_result = post_https(url, post_data, post_header)
  
  post_result
end