C:/xampp/htdocs/moodle/portfolio/googledocs/lib.php

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<?php
require_once($CFG->libdir.'/portfolio/plugin.php');
require_once($CFG->libdir.'/googleapi.php');

class portfolio_plugin_googledocs extends portfolio_plugin_push_base {
    private $sessiontoken;

    public function supported_formats() {
        return array(
            PORTFOLIO_FORMAT_PLAINHTML,
            PORTFOLIO_FORMAT_IMAGE,
            PORTFOLIO_FORMAT_TEXT,
            PORTFOLIO_FORMAT_PDF,
            PORTFOLIO_FORMAT_DOCUMENT,
            PORTFOLIO_FORMAT_PRESENTATION,
            PORTFOLIO_FORMAT_SPREADSHEET
        );
    }

    public static function get_name() {
        return get_string('pluginname', 'portfolio_googledocs');
    }

    public function prepare_package() {
        // we send the files as they are, no prep required
        return true;
    }

    public function get_interactive_continue_url(){
        return 'http://docs.google.com/';
    }

    public function expected_time($callertime) {
        // we trust what the portfolio says
        return $callertime;
    }

    public function send_package() {

        if(!$this->sessiontoken){
            throw new portfolio_plugin_exception('nosessiontoken', 'portfolio_googledocs');
        }

        $gdocs = new google_docs(new google_authsub($this->sessiontoken));

        foreach ($this->exporter->get_tempfiles() as $file) {
            if(!$gdocs->send_file($file)){
                throw new portfolio_plugin_exception('sendfailed', 'portfolio_gdocs', $file->get_filename());
            }
        }
    }

    public function steal_control($stage) {
        global $CFG;
        if ($stage != PORTFOLIO_STAGE_CONFIG) {
            return false;
        }

        $sesskey = google_docs::get_sesskey($this->get('user')->id);

        if($sesskey){
            try{
                $gauth = new google_authsub($sesskey);
                $this->sessiontoken = $sesskey;
                return false;
            }catch(Exception $e){
                // sesskey is not valid, delete store and re-auth
                google_docs::delete_sesskey($this->get('user')->id);
            }
        }

        return google_authsub::login_url($CFG->wwwroot.'/portfolio/add.php?postcontrol=1&id=' . $this->exporter->get('id') . '&sesskey=' . sesskey(), google_docs::REALM);
    }

    public function post_control($stage, $params) {
        if ($stage != PORTFOLIO_STAGE_CONFIG) {
            return;
        }

        if(!array_key_exists('token', $params)){
            throw new portfolio_plugin_exception('noauthtoken', 'portfolio_googledocs');
        }

        // we now have our auth token, get a session token..
        $gauth = new google_authsub(false, $params['token']);
        $this->sessiontoken = $gauth->get_sessiontoken();

        google_docs::set_sesskey($this->sessiontoken, $this->get('user')->id);
    }

    public static function allows_multiple_instances() {
        return false;
    }
}

function portfolio_googledocs_user_deleted($user){
    // it is only by luck that the user prefstill exists now?
    // We probably need a pre-delete event?
    if($sesskey = google_docs::get_sesskey($user->id)){
        try{
            $gauth = new google_authsub($sesskey);

            $gauth->revoke_session_token();
        }catch(Exception $e){
            // we don't care that much about success- just being good
            // google api citzens
            return true;
        }
    }

    return true;
}