class Drafts_For_Friends {

	function __construct() {
    	add_action( 'init', array( $this, 'init' ) );
	}

	function init() {
		// ...
		add_action( 'save_post',		array( $this, 'save_post' ), 10, 2 );
	}
	
	/**
	 * Performs any extra processing when a post is saved
	 * @param int $post_id The ID of the current revision of the edited post
	 * @param object $revision The full object of the current revision of the edited post
	 */
	public function save_post( $post_id, $post )
	{
		if( 1 !== did_action( 'save_post' ) )
			return;
			
		$ignored_actions = array( 'trash', 'untrash', 'restore' );
		
		// 3.6-alpha-23646 passes the canonical $post, while previous versions passed the revision, so we need to check which one we have 
		//if ( 'revision' == $post->post_type )
			//$post = get_post( $post->post_parent );
		
		// Avoid processing the post if it's not in the desired state
		if( isset( $_GET[ 'action' ] ) && in_array( $_GET[ 'action' ], $ignored_actions ) )
			return;

		if(	!$post || 'post' != $post->post_type || ! current_user_can( self::REQUIRED_CAPABILITY, $post_id ) )
			return;

		if( ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) || 'auto-draft' == $post->post_status )
			return;
		
		// Process the post
		$status_messages = $this->process_metabox_actions( $post->ID, $this->validate_metabox_actions( $_POST ) );
	}

	/**
	 * Processes actions triggered in metaboxes
	 * 
	 * @since 2.3
	 * 
	 * @param int $post_id The ID of the canonical post that the current revision being saved is attached to
	 * @param array $actions The metabox actions that were activated
	 * @return string The status method from the action taken
	 */
	protected function process_metabox_actions( $post_id, $actions )
	{
		$status_messages = array();
		
		if ( isset( $actions['share'] ) )
			$status_messages[] = $this->process_post_options( $post_id, $actions['share']['expires'], $actions['share']['measure'] );
		
		if ( isset( $actions['extend'] ) )
			$status_messages[] = $this->process_extend( $actions['extend']['key'], $actions['extend']['expires'], $actions['extend']['measure'] );
		
		if ( isset( $actions['email'] ) )
			$status_messages[] = $this->process_email_share_url( $actions['email']['key'], $actions['email']['guest_email_address'] );
				
		if ( isset( $actions['unshare'] ) )
			$status_messages[] = $this->process_delete( $actions['unshare']['key'] );
		
		return $status_messages;
	}
}