# Copyright 2008-2010 Universidad Politécnica de Madrid and Agora Systems S.A.
#
# This file is part of VCC (Virtual Conference Center).
#
# VCC is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# VCC is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with VCC.  If not, see <http://www.gnu.org/licenses/>.

   class MarteToken < ActiveResource::Base
	  self.site = "http://marte3.dit.upm.es/MarteServer/rest/rooms/:room_id"
	  self.element_name = "token"
	  
	  #KEY="123asd123"	
	  #SERVICE_NAME="standalone"
	  KEY="GlobalRules1234"	
	  SERVICE_NAME="global"
	  MAUTH_VERSION="3.1"
	  MARTE_URL="marte3.dit.upm.es"
	  
	  
	  #new is called MarteToken.new(:username=>'pepe', :role=>'admin', {:room_id=>'room_name'})
	  #save is called MarteToken.save
	  #create is called MarteToken.create(:username=>'pepe', :role=>'admin', {:room_id=>'room_name'})
	  #delete is called MarteToken.delete(id)
	  #show is called MarteToken.find(:all)
	  
	  
	  
	  #define the headers to add Authentication
	  def self.headers(attributes = {})
		#get the params to fill in the headers
		userName = attributes['username']
		role = attributes['role']
		
		#timestamp without decimals
		timestamp=Time.now.to_i
		
		#cnonce, we use a randon number between 1 and 999.999.999
		cnonce=rand(1000000000)
		
		#now we prepare the signature. It is a HMAC:SHA1 of "timestamp,cnonce,username,role"
		to_sign="#{timestamp},#{cnonce},#{userName},#{role}"
		extra_header=",mauth_username=\"#{userName}\",mauth_role=\"#{role}\"" 
		
		puts "cosas pa firmar " + to_sign
		signature=Base64.b64encode(HMAC::SHA1.hexdigest(KEY, to_sign)).chomp.gsub(/\n/,'')
		
		#everything ready, create the message headers			
		headers = {
			"Accept" => "application/xml",
			"Content-Type" => "application/xml",
			"Authorization"=> "MAuth realm=\"#{MARTE_URL}\", mauth_signature_method=\"HMAC_SHA1\", mauth_serviceid=\"#{SERVICE_NAME}\",mauth_signature=\"#{signature}\",mauth_timestamp=\"#{timestamp}\",mauth_cnonce=\"#{cnonce}\",mauth_version=\"#{MAUTH_VERSION}\"#{extra_header}"
		}		
	end

	#redefined to remove format.extension
        def self.collection_path(prefix_options = {}, query_options = nil)
            prefix_options, query_options = split_options(prefix_options) if query_options.nil?
            "#{prefix(prefix_options)}#{collection_name}#{query_string(query_options)}"
        end

	def self.element_path(id, prefix_options = {}, query_options = nil)
		prefix_options, query_options = split_options(prefix_options) if query_options.nil?
           "#{prefix(prefix_options)}#{collection_name}/#{id}#{query_string(query_options)}"
     	end

        def create
          returning connection.post(collection_path, encode, self.class.headers(attributes)) do |response|
            self.id = id_from_response(response)
            load_attributes_from_response(response)
          end
        end
   end