gnu-social/actions/finishremotesubscribe.php

<?php
/*
 * Laconica - a distributed open-source microblogging tool
 * Copyright (C) 2008, Controlez-Vous, Inc.
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

if (!defined('LACONICA')) { exit(1); }

require_once(INSTALLDIR.'/lib/omb.php');

class FinishremotesubscribeAction extends Action
{

    function handle($args)
    {

        parent::handle($args);

        if (common_logged_in()) {
            common_user_error(_('You can use the local subscription!'));
            return;
        }

        $omb = $_SESSION['oauth_authorization_request'];

        if (!$omb) {
            common_user_error(_('Not expecting this response!'));
            return;
        }

        common_debug('stored request: '.print_r($omb,true), __FILE__);

        common_remove_magic_from_request();
        $req = OAuthRequest::from_request();

        $token = $req->get_parameter('oauth_token');

        # I think this is the success metric

        if ($token != $omb['token']) {
            common_user_error(_('Not authorized.'));
            return;
        }

        $version = $req->get_parameter('omb_version');

        if ($version != OMB_VERSION_01) {
            common_user_error(_('Unknown version of OMB protocol.'));
            return;
        }

        $nickname = $req->get_parameter('omb_listener_nickname');

        if (!$nickname) {
            common_user_error(_('No nickname provided by remote server.'));
            return;
        }

        $profile_url = $req->get_parameter('omb_listener_profile');

        if (!$profile_url) {
            common_user_error(_('No profile URL returned by server.'));
            return;
        }

        if (!Validate::uri($profile_url, array('allowed_schemes' => array('http', 'https')))) {
            common_user_error(_('Invalid profile URL returned by server.'));
            return;
        }

        if ($profile_url == common_local_url('showstream', array('nickname' => $nickname))) {
            common_user_error(_('You can use the local subscription!'));
            return;
        }

        common_debug('listenee: "'.$omb['listenee'].'"', __FILE__);

        $user = User::staticGet('nickname', $omb['listenee']);

        if (!$user) {
            common_user_error(_('User being listened to doesn\'t exist.'));
            return;
        }

        $other = User::staticGet('uri', $omb['listener']);

        if ($other) {
            common_user_error(_('You can use the local subscription!'));
            return;
        }

        $fullname = $req->get_parameter('omb_listener_fullname');
        $homepage = $req->get_parameter('omb_listener_homepage');
        $bio = $req->get_parameter('omb_listener_bio');
        $location = $req->get_parameter('omb_listener_location');
        $avatar_url = $req->get_parameter('omb_listener_avatar');

        list($newtok, $newsecret) = $this->access_token($omb);

        if (!$newtok || !$newsecret) {
            common_user_error(_('Couldn\'t convert request tokens to access tokens.'));
            return;
        }

        # XXX: possible attack point; subscribe and return someone else's profile URI

        $remote = Remote_profile::staticGet('uri', $omb['listener']);

        if ($remote) {
            $exists = true;
            $profile = Profile::staticGet($remote->id);
            $orig_remote = clone($remote);
            $orig_profile = clone($profile);
            # XXX: compare current postNotice and updateProfile URLs to the ones
            # stored in the DB to avoid (possibly...) above attack
        } else {
            $exists = false;
            $remote = new Remote_profile();
            $remote->uri = $omb['listener'];
            $profile = new Profile();
        }

        $profile->nickname = $nickname;
        $profile->profileurl = $profile_url;

        if ($fullname) {
            $profile->fullname = $fullname;
        }
        if ($homepage) {
            $profile->homepage = $homepage;
        }
        if ($bio) {
            $profile->bio = $bio;
        }
        if ($location) {
            $profile->location = $location;
        }

        if ($exists) {
            $profile->update($orig_profile);
        } else {
            $profile->created = DB_DataObject_Cast::dateTime(); # current time
            $id = $profile->insert();
            if (!$id) {
                common_server_error(_('Error inserting new profile'));
                return;
            }
            $remote->id = $id;
        }

        if ($avatar_url) {
            if (!$this->add_avatar($profile, $avatar_url)) {
                common_server_error(_('Error inserting avatar'));
                return;
            }
        }

        $remote->postnoticeurl = $omb['post_notice_url'];
        $remote->updateprofileurl = $omb['update_profile_url'];

        if ($exists) {
            if (!$remote->update($orig_remote)) {
                common_server_error(_('Error updating remote profile'));
                return;
            }
        } else {
            $remote->created = DB_DataObject_Cast::dateTime(); # current time
            if (!$remote->insert()) {
                common_server_error(_('Error inserting remote profile'));
                return;
            }
        }

        if ($user->hasBlocked($profile)) {
            $this->client_error(_('That user has blocked you from subscribing.'));
            return;
        }

        $sub = new Subscription();

        $sub->subscriber = $remote->id;
        $sub->subscribed = $user->id;

        $sub_exists = false;

        if ($sub->find(true)) {
            $sub_exists = true;
            $orig_sub = clone($sub);
        } else {
            $sub_exists = false;
            $sub->created = DB_DataObject_Cast::dateTime(); # current time
        }

        $sub->token = $newtok;
        $sub->secret = $newsecret;

        if ($sub_exists) {
            $result = $sub->update($orig_sub);
        } else {
            $result = $sub->insert();
        }

        if (!$result) {
            common_log_db_error($sub, ($sub_exists) ? 'UPDATE' : 'INSERT', __FILE__);
            common_user_error(_('Couldn\'t insert new subscription.'));
            return;
        }

        # Notify user, if necessary

        mail_subscribe_notify_profile($user, $profile);

        # Clear the data
        unset($_SESSION['oauth_authorization_request']);

        # If we show subscriptions in reverse chron order, this should
        # show up close to the top of the page

        common_redirect(common_local_url('subscribers', array('nickname' =>
                                                             $user->nickname)));
    }

    function add_avatar($profile, $url)
    {
        $temp_filename = tempnam(sys_get_temp_dir(), 'listener_avatar');
        copy($url, $temp_filename);
        return $profile->setOriginal($temp_filename);
    }

    function access_token($omb)
    {

        common_debug('starting request for access token', __FILE__);

        $con = omb_oauth_consumer();
        $tok = new OAuthToken($omb['token'], $omb['secret']);

        common_debug('using request token "'.$tok.'"', __FILE__);

        $url = $omb['access_token_url'];

        common_debug('using access token url "'.$url.'"', __FILE__);

        # XXX: Is this the right thing to do? Strip off GET params and make them
        # POST params? Seems wrong to me.

        $parsed = parse_url($url);
        $params = array();
        parse_str($parsed['query'], $params);

        $req = OAuthRequest::from_consumer_and_token($con, $tok, "POST", $url, $params);

        $req->set_parameter('omb_version', OMB_VERSION_01);

        # XXX: test to see if endpoint accepts this signature method

        $req->sign_request(omb_hmac_sha1(), $con, $tok);

        # We re-use this tool's fetcher, since it's pretty good

        common_debug('posting to access token url "'.$req->get_normalized_http_url().'"', __FILE__);
        common_debug('posting request data "'.$req->to_postdata().'"', __FILE__);

        $fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
        $result = $fetcher->post($req->get_normalized_http_url(),
                                 $req->to_postdata(),
                                 array('User-Agent' => 'Laconica/' . LACONICA_VERSION));

        common_debug('got result: "'.print_r($result,true).'"', __FILE__);

        if ($result->status != 200) {
            return null;
        }

        parse_str($result->body, $return);

        return array($return['oauth_token'], $return['oauth_token_secret']);
    }
}