gistfile1.rb

require "nestful"
require "roauth"

def upload(path_to_file)
    twitpic_key = "my_twitpic_api_key"
    oauth_url = "https://api.twitter.com/1/account/verify_credentials.json"

    oauth = {
      :access_key => "account_access_key",
      :access_secret => "account_access_secret",
      :consumer_key => "application_key",
      :consumer_secret => "application_secret"
    }

    oauth_result = ::ROAuth.header(oauth, oauth_url, {})

    headers = {
     "X-Auth-Service-Provider" => oauth_url,
     "X-Verify-Credentials-Authorization" => oauth_result
    }
    
    params = {
        :media => File.open(path_to_file),
        :key => twitpic_key
    }

    result = Nestful.post(endpoint_url, :format => :multipart, :headers => headers, :params => params)

    JSON.parse(result)
end

endpoint_url = "http://api.twitpic.com/2/upload.format"